CN114910276A - Automobile ride comfort evaluation method, equipment, storage medium and device - Google Patents
Automobile ride comfort evaluation method, equipment, storage medium and device Download PDFInfo
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Abstract
The invention discloses a method, equipment, a storage medium and a device for evaluating the smoothness of an automobile. The method generates the subjective and objective evaluation system through subjective and objective unification on the frequency division evaluation of different frequency bands and the evaluation information fed back by the tester, is not suitable for engineering application compared with the situation that the subjective and objective evaluation system combining the evaluation content fed back by the tester is lacked in the prior art and is not suitable for engineering application.
Description
Technical Field
The invention relates to the technical field of automobiles, in particular to an automobile ride comfort evaluation method, equipment, a storage medium and a device.
Background
When an automobile runs, vibration caused by uneven road surface in the running process of the automobile can affect the mechanical strength and fatigue strength of vehicle component materials, so that electric and mechanical devices fail, mechanical structures are damaged, and rotating parts are abraded. If the vibration is too large, the organ is easily damaged, and the health of the human body is damaged. Therefore, in the automobile development process, the research on the smoothness of the automobile in the driving process is very important, the smoothness is improved, the driving safety is facilitated, the body health of passengers is protected, and the comprehensive performance of the automobile is improved.
In ISO 2631-1:1997 evaluation of mechanical vibrations and exposure of the impacting human body to bulk vibrations, part 1: the general requirements define the weighting coefficients for the different frequency bands. According to the method, a GB/T4970-. The method divides the frequency range of 0.5-80Hz into 23 frequency bands, and the corresponding weighting coefficients of each frequency band are different due to different positions and directions. The evaluation method considers the overall performance of the vehicle in the whole frequency range of 0.5-80Hz, only can reflect the overall level of the random input smoothness of the vehicle, but lacks frequency division evaluation on different frequency sections and driving evaluation content fed back by corresponding testers, and is not suitable for guiding forward development and engineering application of the smoothness.
Therefore, the evaluation method specified by the test method for the smoothness of the random road surface at the present stage is suitable for judging the overall level of the smoothness of the random road surface of the vehicle, lacks of frequency division evaluation of different frequency sections, and is not suitable for guiding forward development and engineering application; meanwhile, the smoothness of the random road surface at the present stage is not only lack of an objective evaluation method suitable for guiding forward development and engineering application, but also lack of an objective evaluation system combining subjective and unified evaluation contents fed back by testers.
The above is only for the purpose of assisting understanding of the technical aspects of the present invention, and does not represent an admission that the above is prior art.
Disclosure of Invention
The invention mainly aims to provide a method, equipment, a storage medium and a device for evaluating the smoothness of an automobile, and aims to solve the technical problems that in the prior art, the smoothness evaluation method lacks an objective and subjective evaluation system for frequency division evaluation of different frequency bands and subjective and unified evaluation contents fed back by testers, and is not suitable for guiding forward development and engineering application.
In order to achieve the above object, the present invention provides an automobile ride comfort evaluation method, including the steps of:
acquiring vibration acceleration data of a target vehicle corresponding to the evaluation point in the preset direction;
carrying out Fourier transform on the vibration acceleration data to obtain acceleration frequency domain data;
carrying out frequency division calculation on the acceleration frequency domain data to obtain an acceleration frequency domain effective value;
and calculating an objective index item of the evaluation point according to the acceleration frequency domain effective value, and determining a smoothness evaluation result according to evaluation information fed back by a tester and the objective index item.
Optionally, the step of performing frequency division calculation on the acceleration frequency domain data to obtain an effective value of an acceleration frequency domain includes;
performing frequency division processing on the frequency domain curve in the acceleration frequency domain data based on a preset frequency division point to obtain a frequency domain curve after frequency division;
and calculating the effective value of the frequency domain curve after frequency division to obtain the acceleration frequency domain effective value in a preset frequency domain range.
Optionally, the step of calculating the objective index item of the evaluation point according to the acceleration frequency domain effective value, and determining a smoothness evaluation result according to evaluation information fed back by a tester and the objective index item includes:
calculating a first objective index item and a second objective index item of the evaluation point according to the acceleration frequency domain effective value;
and determining a smoothness evaluation result according to the first-order vibration evaluation information and the second-order vibration evaluation information in the evaluation information fed back by the tester, the first objective index item and the second objective index item.
Optionally, the preset frequency domain range includes a first frequency domain range and a second frequency domain range, the acceleration frequency domain effective value includes acceleration frequency domain effective values in a first direction, a second direction and a third direction, and the step of calculating a first objective index item and a second objective index item of the evaluation point according to the acceleration frequency domain effective value includes:
calculating a first objective index item of the evaluation point according to the acceleration frequency domain effective values in the first direction, the second direction and the third direction in the first frequency domain range;
calculating a second objective index item of the evaluation point according to the acceleration frequency domain effective values in the first direction, the second direction and the third direction in the second frequency domain range;
the step of determining the smoothness evaluation result according to the first-order vibration evaluation information and the second-order vibration evaluation information in the evaluation information fed back by the tester, the first objective index item and the second objective index item comprises the following steps:
determining a first evaluation item according to first-order vibration evaluation information in evaluation information fed back by a tester;
determining a second evaluation item according to second-order vibration evaluation information in the evaluation information fed back by the tester;
determining a first smoothness evaluation result according to the first objective index item and the first evaluation item;
determining a second smoothness evaluation result according to the second objective index item and the second evaluation item;
and determining a smoothness evaluation result according to the first smoothness evaluation result and the second smoothness evaluation result.
Optionally, after the step of calculating the objective index item of the evaluation point according to the acceleration frequency domain effective value, and determining a smoothness evaluation result according to evaluation information fed back by a tester and the objective index item, the method further includes:
comparing the smoothness evaluation result with an expected target, and determining whether the smoothness of the evaluation point needs to be improved or not according to the comparison result;
when the smoothness of the evaluation point needs to be improved, determining a smoothness fault frequency range according to the evaluation information and the objective index item;
and improving the system or the part corresponding to the evaluation point according to the ride comfort fault frequency range.
Optionally, the step of determining whether the smoothness of the evaluation point needs to be improved according to the comparison result includes:
when the smoothness evaluation result does not reach the expected target, determining that the smoothness of the evaluation point needs to be improved;
determining that the smoothness of the evaluation point does not need to be improved when the smoothness evaluation result reaches the expected target.
Optionally, the step of improving the system or the component corresponding to the evaluation point according to the ride comfort fault frequency range includes:
determining a fault system according to the ride comfort fault frequency range, and analyzing the fault system;
and determining a fault part according to the analysis result, and sending fault information corresponding to the fault part to a tester for improvement.
In addition, in order to achieve the above object, the present invention further provides an automobile ride comfort evaluation apparatus, which includes a memory, a processor, and an automobile ride comfort evaluation program stored in the memory and operable on the processor, wherein the automobile ride comfort evaluation program is configured to implement the steps of the automobile ride comfort evaluation as described above.
In addition, to achieve the above object, the present invention further provides a storage medium, wherein the storage medium stores a vehicle ride comfort evaluation program, and the vehicle ride comfort evaluation program, when executed by a processor, implements the steps of the vehicle ride comfort evaluation method as described above.
In addition, in order to achieve the above object, the present invention also provides an automobile ride comfort evaluation device, including:
the data acquisition module is used for acquiring vibration acceleration data of the target vehicle in a preset direction corresponding to the evaluation point;
the frequency domain analysis module is used for carrying out Fourier transform on the vibration acceleration data to obtain acceleration frequency domain data;
the frequency domain analysis module is also used for carrying out frequency division calculation on the acceleration frequency domain data to obtain an acceleration frequency domain effective value;
and the smoothness evaluation module is used for calculating the objective index item of the evaluation point according to the acceleration frequency domain effective value and determining a smoothness evaluation result according to evaluation information fed back by a tester and the objective index item.
The method comprises the steps of collecting vibration acceleration data of a target vehicle in a preset direction corresponding to an evaluation point; carrying out Fourier transform on the vibration acceleration data to obtain acceleration frequency domain data; carrying out frequency division calculation on the acceleration frequency domain data to obtain an acceleration frequency domain effective value; and calculating an objective index item of the evaluation point according to the acceleration frequency domain effective value, and determining a smoothness evaluation result according to evaluation information fed back by a tester and the objective index item. According to the invention, the subjective and objective evaluation system is generated by subjectively and uniformly performing the frequency division evaluation on different frequency bands and combining the evaluation information fed back by the tester, and compared with the situation that the subjective and objective evaluation system which performs subjective and objective uniform evaluation on the frequency division evaluation on different frequency bands and combines the evaluation content fed back by the tester is lacked in the prior art and is not suitable for guiding forward development and engineering application, the invention provides the frequency division evaluation method from the viewpoint of guiding the smoothness development, so that the evaluation content fed back by the tester and the objective index are mutually corresponding, the engineering application value is realized, the accuracy of the smoothness result is improved, and the project development period is shortened.
Drawings
Fig. 1 is a schematic structural diagram of an automobile ride comfort evaluation device in a hardware operating environment according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart illustrating a first embodiment of a method for evaluating the ride comfort of a vehicle according to the present invention;
FIG. 3 is a schematic flow chart illustrating a second embodiment of the method for evaluating the ride comfort of a vehicle according to the present invention;
FIG. 4 is a schematic view of a comprehensive evaluation flow chart of a second embodiment of the method for evaluating the ride comfort of an automobile according to the present invention;
FIG. 5 is a schematic diagram of a frequency domain analysis of a second embodiment of the method for evaluating the ride comfort of an automobile according to the present invention;
FIG. 6 is a flowchart illustrating an image processing method according to a third embodiment of the present invention;
fig. 7 is a block diagram of the first embodiment of the device for evaluating the smoothness of an automobile according to the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an automobile ride comfort evaluation device in a hardware operating environment according to an embodiment of the present invention.
As shown in fig. 1, the vehicle ride comfort evaluating apparatus may include: a processor 1001, such as a Central Processing Unit (CPU), a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. Wherein a communication bus 1002 is used to enable connective communication between these components. The user interface 1003 may include a Display screen (Display), and the optional user interface 1003 may further include a standard wired interface and a wireless interface, and the wired interface for the user interface 1003 may be a USB interface in the present invention. The network interface 1004 may optionally include a standard wired interface, a Wireless interface (e.g., a Wireless-Fidelity (Wi-Fi) interface). The Memory 1005 may be a Random Access Memory (RAM) or a Non-volatile Memory (NVM), such as a disk Memory. The memory 1005 may alternatively be a storage device separate from the processor 1001.
Those skilled in the art will appreciate that the configuration shown in fig. 1 does not constitute a limitation of the vehicle ride comfort evaluation apparatus, and may include more or fewer components than those shown, or some components in combination, or a different arrangement of components.
As shown in FIG. 1, a memory 1005, identified as a computer storage medium, may include an operating system, a network communication module, a user interface module, and a vehicle ride comfort assessment program.
In the device for evaluating the smoothness of an automobile shown in fig. 1, the network interface 1004 is mainly used for connecting a background server and performing data communication with the background server; the user interface 1003 is mainly used for connecting user equipment; the automobile ride comfort evaluation device calls an automobile ride comfort evaluation program stored in a memory 1005 through a processor 1001 and executes the automobile ride comfort evaluation method provided by the embodiment of the invention.
Based on the hardware structure, the embodiment of the automobile ride comfort evaluation method is provided.
Referring to fig. 2, fig. 2 is a schematic flow chart of a first embodiment of the method for evaluating the ride comfort of the vehicle of the present invention, and provides the first embodiment of the method for evaluating the ride comfort of the vehicle of the present invention.
In this embodiment, the method for evaluating the smoothness of an automobile includes the following steps:
step S10: and acquiring vibration acceleration data of the target vehicle corresponding to the preset direction of the evaluation point.
It should be noted that, the execution main body of the embodiment may be a device having a function of evaluating vehicle ride comfort, such as an on-board computer, a notebook, a mobile phone, and the like, and this embodiment is not limited thereto, and the device may be a device built in the target vehicle or a device externally connected to the target vehicle.
It is understood that the vehicle model of the target vehicle in this embodiment may be a commercial vehicle, and is suitable for all random road surface scenes, including but not limited to a secondary cement road, a secondary asphalt road, a high-speed cement road, a high-speed asphalt road, a suburban road, and the like. Typically, the frequency of vibrations experienced by the occupant of the commercial vehicle is within 20 Hz. The offset frequency of a chassis suspension damping system and a cab suspension damping system of the commercial vehicle is low, generally in the range of 0-6Hz, and the bending and twisting of a vehicle frame and other local modes are generally in the range of 6-20 Hz. According to the scheme, in the development process of the smoothness of the commercial vehicle, a tester can drive the vehicle to run on a random road surface, the vehicle speed is controlled to recommend constant speed running (30 km/h, 50km/h, 70km/h, 80km/h, 90km/h and the like are recommended, the vehicle speed can be set according to actual road conditions and is not limited to the vehicle speed), the system characteristics of each damping system of the commercial vehicle and the vibration response sensed by a driver and passengers are comprehensively evaluated through the subjective and objective evaluation system in the scheme, and compared with the existing evaluation method, the scheme realizes more accurate evaluation.
It should be understood that the target vehicle corresponding evaluation point may be a driving seat of the target vehicle as an evaluation point, and may also be other structures of the vehicle as an evaluation point, and the preset direction refers to a data acquisition direction preset when the driving seat is evaluated for smoothness, for example: x direction, Y direction and Z direction.
In the concrete implementation, in order to improve the accuracy of the ride comfort result, the vibration acceleration signals generated in the X direction, the Y direction and the Z direction can be collected through the vibration sensor arranged on the seat. The data CAN be that the vibration sensor transmits vibration acceleration signals to the vehicle-mounted computer through a CAN line, and the vehicle-mounted computer generates vibration acceleration data according to the signals and stores the vibration acceleration data as a text file for later data analysis.
Step S20: and carrying out Fourier transform on the vibration acceleration data to obtain acceleration frequency domain data.
It should be noted that fourier transform may be performed on the vibration acceleration data in the stored text file to obtain transformed data, and data normalization processing may be performed on the transformed data to obtain acceleration frequency domain data, where the acceleration frequency domain data includes data such as vibration acceleration, unilateral amplitude spectrum, and frequency.
In the scheme, the data is not subjected to weighting processing, the problems of frequency peak value reduction and distortion caused by the difference of weighting coefficients can be solved, compared with the existing evaluation method that the weighting coefficients corresponding to frequency bands are different due to different positions and directions, the method for calculating the total weighted acceleration root mean square value of the random road surface of the vehicle is provided, the existing evaluation method considers the overall performance of the vehicle in the whole frequency range and only can reflect the overall level of the random input smoothness of the vehicle, the scheme obtains the transformed data by performing Fourier transformation on the vibration acceleration data in the stored text file and performs data normalization processing on the transformed data, so that acceleration frequency domain data is obtained, wherein the data is not subjected to weighting processing, and the authenticity of the data can be ensured.
Step S30: and carrying out frequency division calculation on the acceleration frequency domain data to obtain an acceleration frequency domain effective value.
It should be noted that the frequency division calculation is to perform frequency division processing on the acceleration frequency domain data according to a preset frequency range, and perform analysis calculation on the acceleration frequency domain data after frequency division to obtain an acceleration frequency domain effective value.
It should be understood that the acceleration frequency domain effective value may be an effective numerical value of an objective index term used for calculating the evaluation point.
Step S40: and calculating an objective index item of the evaluation point according to the acceleration frequency domain effective value, and determining a smoothness evaluation result according to evaluation information fed back by a tester and the objective index item.
The evaluation information fed back by the tester refers to evaluation information fed back by the tester when performing a ride comfort evaluation project, and the evaluation information includes evaluation information on road surface isolation feeling, vibration strength, softness and the like of the seat.
It can be understood that in order to ensure the accuracy of the ride comfort evaluation result of the commercial vehicle, the final ride comfort evaluation result can be determined by receiving evaluation information of the seat, such as road isolation sense, vibration strength, softness and the like, fed back by a tester when a random road surface is subjected to a ride comfort test and objective index items of evaluation points.
The method comprises the steps of acquiring vibration acceleration data of a target vehicle corresponding to an evaluation point in a preset direction; carrying out Fourier transform on the vibration acceleration data to obtain acceleration frequency domain data; carrying out frequency division calculation on the acceleration frequency domain data to obtain an acceleration frequency domain effective value; and calculating an objective index item of the evaluation point according to the acceleration frequency domain effective value, and determining a smoothness evaluation result according to evaluation information fed back by a tester and the objective index item. In the embodiment, the subjective and objective evaluation systems are generated through subjective and objective unification on the frequency division evaluation of different frequency bands and the evaluation information fed back by the tester, and compared with the fact that the subjective and objective evaluation systems which are used for subjective and objective unification on the frequency division evaluation of different frequency bands and the evaluation content fed back by the tester are lacked in the prior art, the subjective and objective evaluation systems are not suitable for guiding forward development and engineering application.
Referring to fig. 3, fig. 3 is a schematic flow chart of a second embodiment of the method for evaluating the ride comfort of the vehicle according to the present invention, and the second embodiment of the method for evaluating the ride comfort of the vehicle according to the present invention is provided based on the first embodiment of the present invention.
In this embodiment, the step S30 includes:
step S301: and carrying out frequency division processing on the frequency domain curve in the acceleration frequency domain data based on a preset frequency division point to obtain a frequency domain curve after frequency division.
It should be noted that the preset frequency dividing point is a preset frequency dividing point for dividing the frequency domain curve.
It can be understood that the frequency domain curve in the acceleration frequency domain data refers to a frequency domain curve constructed according to the acceleration frequency domain data, which includes vibration acceleration, a single-side amplitude spectrum, frequency and the like.
In a specific implementation, the frequency domain curve is divided according to the frequency division point to obtain the frequency domain curve after frequency division, for example: and setting the frequency division point to be 6HZ for the frequency domain curve under the frequency of 0-20HZ, namely dividing the frequency domain curve into 0-6HZ and 6-20HZ according to the frequency division point.
Step S302: and calculating the effective value of the frequency domain curve after frequency division to obtain the acceleration frequency domain effective value in a preset frequency domain range.
It should be noted that the preset frequency domain range may be a frequency division range corresponding to a preset frequency division point, for example: and setting the frequency dividing point to be 6HZ for the frequency domain curve under the frequency of 0-20HZ, namely dividing the frequency domain curve into 0-6HZ and 6-20HZ according to the frequency dividing point, and calculating effective values corresponding to the frequency domain curves of 0-6HZ and 6-20HZ to obtain the acceleration frequency domain effective values in the frequency domain ranges of 0-6HZ and 6-20 HZ.
In this embodiment, the objective index items include a first objective index item and a second objective index item; the step S40 includes:
step S401: and calculating a first objective index item and a second objective index item of the evaluation point according to the acceleration frequency domain effective value.
It should be noted that the first objective index item and the second objective index item may be objective index items obtained by calculation based on a preset objective index item calculation formula and an acceleration frequency domain effective value within a preset range. The preset objective index item calculation formula is shown as formula (1):
in formula (1):
a v -an objective evaluation index of the evaluation point;
a x -evaluating the effective value of the acceleration frequency domain of the point X direction;
a y evaluating the effective value of the acceleration frequency domain in the Y direction of the point;
a z and evaluating the effective value of the acceleration frequency domain of the point Z direction.
Further, the preset frequency domain range includes a first frequency domain range and a second frequency domain range, the acceleration frequency domain effective value includes acceleration frequency domain effective values in a first direction, a second direction and a third direction, and step S401 further includes: calculating a first objective index item of the evaluation point according to the acceleration frequency domain effective values in the first direction, the second direction and the third direction in the first frequency domain range; and calculating a second objective index item of the evaluation point according to the acceleration frequency domain effective values in the first direction, the second direction and the third direction in the second frequency domain range.
The first direction, the second direction, and the third direction are X, Y, and Z directions in a three-dimensional space.
In the specific implementation, the preset frequency range corresponding to the commercial vehicle seat is divided based on the preset frequency dividing point to obtain a first frequency range and a second frequency range in the X direction, the Y direction and the Z direction, the frequency domain curve after frequency division is obtained by dividing the frequency domain curve corresponding to the preset frequency domain range according to the first frequency range and the second frequency range, and the first objective index item and the second objective index item of the evaluation point are calculated according to the acceleration frequency domain effective value corresponding to the frequency domain curve.
Step S402: and determining a smoothness evaluation result according to the first-order vibration evaluation information and the second-order vibration evaluation information in the evaluation information fed back by the tester, the first objective index item and the second objective index item.
It should be noted that the effective value of the objective evaluation index of the evaluation point in the range of 0-6Hz and the effective value of the evaluation point in the range of 6-20Hz correspond to the first-order vibration and the second-order vibration of the subjective evaluation item, so that the subjective and objective unification is realized. By analyzing a large number of subjective and objective evaluation result samples, the specific mapping relation between the subjective data and the subjective scores can be obtained. According to the system characteristics of each shock absorption system of the commercial vehicle and the vibration response sensed by a driver and a passenger, the vibration is divided into first-order vibration and second-order vibration from a frequency domain, the corresponding frequency ranges are 0-6Hz and 6-20Hz respectively, an objective evaluation index and a subjective evaluation index are defined respectively, for further explanation, the comprehensive evaluation flow diagram of a certain card on a second-level cement road and the frequency domain analysis diagram of a vehicle speed of 50km/h are taken as examples, and the vibration of a driver seat is analyzed, wherein (a) the diagram is vibration acceleration (Z-direction time domain) vibration acceleration data, and (b) the diagram is a frequency domain curve of the acceleration (Z-direction frequency domain). The final evaluation results obtained from the above analysis are shown in table 1 below:
TABLE 1 subjective and objective evaluation results of a certain weight of cards
It can be understood that the subjective evaluation description terms in the above table are only used for reference, and can be adjusted and used according to requirements, and the smoothness evaluation result is determined according to the specific mapping relationship between objective data and subjective evaluation.
Further, the step S402 further includes: determining a first evaluation item according to first-order vibration evaluation information in evaluation information fed back by a tester; determining a second evaluation item according to second-order vibration evaluation information in the evaluation information fed back by the tester; determining a first smoothness evaluation result according to the first objective index item and the first evaluation item; determining a second smoothness evaluation result according to the second objective index item and the second evaluation item; and determining a smoothness evaluation result according to the first smoothness evaluation result and the second smoothness evaluation result.
The first evaluation item may be an evaluation item corresponding to first-order vibration, and the second evaluation item may be an evaluation item corresponding to second-order vibration, where the evaluation items include scoring intervals corresponding to different vibration frequencies. The first smoothness evaluation result may be a comprehensive evaluation result corresponding to the first-order vibration and the first objective index item. The second smoothness evaluation result may be a comprehensive evaluation result corresponding to the second-order vibration and the second objective index item. And determining a final smoothness evaluation result according to the first smoothness evaluation result and the second smoothness evaluation result.
In specific implementation, in order to realize the mutual correspondence between objective evaluation indexes and subjective evaluation items, 6 experienced subjective evaluation testers can be organized, and a certain common secondary road is used as an evaluation road to evaluate and score 17 commercial vehicles. Meanwhile, acceleration data are synchronously acquired and processed according to evaluation information fed back by a tester, and the specific mapping relation between the obtained objective data and the subjective evaluation score is shown in the following table 2.
Table 2: subjective and objective corresponding relation of random road surface
The corresponding relation between the objective data and the subjective score given in the table is suitable for the ride comfort test evaluation of all commercial vehicles on random roads. Through objective data, corresponding scores can be checked according to the table, and under the condition that only testers participate, corresponding subjective scores can be obtained through the objective data. The subjective evaluation items of the first-order vibration and the second-order vibration have negative power, the lowest evaluation item is taken as the final evaluation result,
the method comprises the steps of acquiring vibration acceleration data of a target vehicle corresponding to an evaluation point in a preset direction; carrying out Fourier transform on the vibration acceleration data to obtain acceleration frequency domain data; performing frequency division processing on the frequency domain curve in the acceleration frequency domain data based on a preset frequency division point to obtain a frequency domain curve after frequency division; performing effective value calculation on the frequency domain curve after frequency division to obtain an acceleration frequency domain effective value in a preset frequency domain range, and calculating a first objective index item and a second objective index item of the evaluation point according to the acceleration frequency domain effective value; and determining a smoothness evaluation result according to the first-order vibration evaluation information and the second-order vibration evaluation information in the evaluation information fed back by the tester, the first objective index item and the second objective index item. In the embodiment, the subjective and objective evaluation systems are generated through subjective and objective unification on the frequency division evaluation of different frequency bands and the evaluation information fed back by the tester, and compared with the fact that the subjective and objective evaluation systems which are used for subjective and objective unification on the frequency division evaluation of different frequency bands and the evaluation content fed back by the tester are lacked in the prior art, the subjective and objective evaluation systems are not suitable for guiding forward development and engineering application.
Referring to fig. 6, fig. 6 is a schematic flow chart of a third embodiment of the method for evaluating the ride comfort of the vehicle according to the present invention, and the third embodiment of the method for evaluating the ride comfort of the vehicle according to the present invention is provided based on the first embodiment of the present invention.
In this embodiment, after the step S40, the method further includes:
step S50: and comparing the smoothness evaluation result with an expected target, and determining whether the smoothness of the evaluation point needs to be improved or not according to the comparison result.
It is noted that the desired goal may be for acceptable ranges at different frequency domains and at different vibrations. The comparison result comprises two results that the smoothness evaluation result does not reach the expected target and the smoothness evaluation result reaches the expected target.
Further, the step of determining whether the smoothness of the evaluation point needs to be improved according to the comparison result includes: when the smoothness evaluation result does not reach the expected target, determining that the smoothness of the evaluation point needs to be improved; determining that the smoothness of the evaluation point does not need to be improved when the smoothness evaluation result reaches the expected target.
Step S60: and when the smoothness of the evaluation point needs to be improved, determining a smoothness fault frequency range according to the evaluation information and the objective index item.
When the smoothness of the evaluation point needs to be improved, the smoothness fault frequency range is determined according to the first-order vibration evaluation information and the second-order vibration evaluation information contained in the evaluation information, and the first objective index item and the second objective index item.
Step S70: and improving the system or the part corresponding to the evaluation point according to the ride comfort fault frequency range.
Further, the step S70 further includes: determining a fault system according to the ride comfort fault frequency range, and analyzing the fault system; and determining a fault part according to the analysis result, and sending fault information corresponding to the fault part to a tester for improvement.
It should be noted that the analysis result is obtained after performing fault analysis on hardware operation information, interface connection information, and software processing flow information in the system in which the fault occurs.
It is understood that the failure information may be information such as the name of the detected abnormal component, the type of the problem, and the failure time based on the above information. And generating reminding information according to the fault information and a preset reminding mode and sending the reminding information to a tester so as to improve a fault system and fault parts in the later period.
The method comprises the steps of acquiring vibration acceleration data of a target vehicle corresponding to an evaluation point in a preset direction; carrying out Fourier transform on the vibration acceleration data to obtain acceleration frequency domain data; carrying out frequency division calculation on the acceleration frequency domain data to obtain an acceleration frequency domain effective value; and calculating an objective index item of the evaluation point according to the acceleration frequency domain effective value, and determining a smoothness evaluation result according to evaluation information fed back by a tester and the objective index item. In the embodiment, the subjective and objective evaluation systems are generated through subjective and objective unification on the frequency division evaluation of different frequency bands and the evaluation information fed back by the tester, and compared with the fact that the subjective and objective evaluation systems which are used for subjective and objective unification on the frequency division evaluation of different frequency bands and the evaluation content fed back by the tester are lacked in the prior art, the subjective and objective evaluation systems are not suitable for guiding forward development and engineering application.
In addition, in order to achieve the above object, the present invention further provides an automobile ride comfort evaluation apparatus, which includes a memory, a processor, and an automobile ride comfort evaluation program stored in the memory and operable on the processor, wherein the automobile ride comfort evaluation program is configured to implement the steps of the automobile ride comfort evaluation as described above.
In addition, to achieve the above object, the present invention further provides a storage medium, wherein the storage medium stores a vehicle ride comfort evaluation program, and the vehicle ride comfort evaluation program, when executed by a processor, implements the steps of the vehicle ride comfort evaluation method as described above.
Referring to fig. 7, fig. 7 is a block diagram illustrating a structure of a first embodiment of the device for evaluating vehicle ride comfort according to the present invention.
As shown in fig. 7, an apparatus for evaluating the smoothness of an automobile according to an embodiment of the present invention includes:
the data acquisition module 10 is used for acquiring vibration acceleration data of a target vehicle corresponding to the evaluation point in the preset direction;
the frequency domain analysis module 20 is configured to perform fourier transform on the vibration acceleration data to obtain acceleration frequency domain data;
the frequency domain analysis module 20 is further configured to perform frequency division calculation on the acceleration frequency domain data to obtain an acceleration frequency domain effective value;
and the smoothness evaluation module 30 is configured to calculate an objective index item of the evaluation point according to the acceleration frequency domain effective value, and determine a smoothness evaluation result according to evaluation information fed back by a tester and the objective index item.
The method comprises the steps of acquiring vibration acceleration data of a target vehicle corresponding to an evaluation point in a preset direction; carrying out Fourier transform on the vibration acceleration data to obtain acceleration frequency domain data; carrying out frequency division calculation on the acceleration frequency domain data to obtain an acceleration frequency domain effective value; and calculating an objective index item of the evaluation point according to the acceleration frequency domain effective value, and determining a smoothness evaluation result according to evaluation information fed back by a tester and the objective index item. In the embodiment, the subjective and objective evaluation systems are generated through subjective and objective unification on the frequency division evaluation of different frequency bands and the evaluation information fed back by the tester, and compared with the fact that the subjective and objective evaluation systems which are used for subjective and objective unification on the frequency division evaluation of different frequency bands and the evaluation content fed back by the tester are lacked in the prior art, the subjective and objective evaluation systems are not suitable for guiding forward development and engineering application.
Further, the frequency domain analysis module 20 is further configured to perform frequency division processing on the frequency domain curve in the acceleration frequency domain data based on a preset frequency division point to obtain a frequency domain curve after frequency division; and carrying out effective value calculation on the frequency domain curve after frequency division to obtain an acceleration frequency domain effective value in a preset frequency domain range.
Further, the smoothness evaluation module 30 is further configured to calculate a first objective index item and a second objective index item of the evaluation point according to the acceleration frequency domain effective value; and determining a smoothness evaluation result according to the first-order vibration evaluation information and the second-order vibration evaluation information in the evaluation information fed back by the tester, the first objective index item and the second objective index item.
Further, the smoothness evaluation module 30 is further configured to calculate a first objective index item of the evaluation point according to the acceleration frequency domain effective values in one direction, a second direction and a third direction in the first frequency domain range; calculating a second objective index item of the evaluation point according to the acceleration frequency domain effective values in one direction, the second direction and the third direction in the second frequency domain range; determining a first evaluation item according to first-order vibration evaluation information in evaluation information fed back by a tester; determining a second evaluation item according to second-order vibration evaluation information in the evaluation information fed back by the tester; determining a first smoothness evaluation result according to the first objective index item and the first evaluation item, and determining a second smoothness evaluation result according to the second objective index item and the second evaluation item; and determining a smoothness evaluation result according to the first smoothness evaluation result and the second smoothness evaluation result.
Further, the vehicle ride comfort evaluation device further includes: the improvement analysis module is used for comparing the smoothness evaluation result with an expected target and determining whether the smoothness of the evaluation point needs to be improved or not according to the comparison result; when the smoothness of the evaluation point needs to be improved, determining a smoothness fault frequency range according to the evaluation information and the objective index item; and improving the system or the part corresponding to the evaluation point according to the ride comfort fault frequency range.
Further, the improvement analysis module is further used for determining that the smoothness of the evaluation point needs to be improved when the smoothness evaluation result does not reach the expected target; determining that the smoothness of the evaluation point does not need to be improved when the smoothness evaluation result reaches the expected target.
Further, the improvement analysis module is further configured to determine a fault system according to the ride comfort fault frequency range, and analyze the fault system; and determining a fault part according to the analysis result, and sending fault information corresponding to the fault part to a tester for improvement.
It should be understood that the above is only an example, and the technical solution of the present invention is not limited in any way, and in a specific application, a person skilled in the art may set the technical solution as needed, and the present invention is not limited thereto.
It should be noted that the above-described work flows are only exemplary, and do not limit the scope of the present invention, and in practical applications, a person skilled in the art may select some or all of them to achieve the purpose of the solution of the embodiment according to actual needs, and the present invention is not limited herein.
In addition, the technical details that are not described in detail in this embodiment may be referred to the method for evaluating the smoothness of an automobile provided in any embodiment of the present invention, and are not described herein again.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in the process, method, article, or system in which the element is included.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The use of the words first, second, third, etc. do not denote any order, but rather the words first, second, third, etc. are to be interpreted as names.
Through the description of the foregoing embodiments, it is clear to those skilled in the art that the method of the foregoing embodiments may be implemented by software plus a necessary general hardware platform, and certainly may also be implemented by hardware, but in many cases, the former is a better implementation. Based on such understanding, the technical solutions of the present invention or portions thereof that contribute to the prior art may be embodied in the form of a software product, where the computer software product is stored in a storage medium (e.g., a Read Only Memory (ROM)/Random Access Memory (RAM), a magnetic disk, an optical disk), and includes several instructions for enabling a terminal device (which may be a mobile phone, a computer, a server, or a network device) to execute the method according to the embodiments of the present invention.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. An automobile ride comfort evaluation method is characterized by comprising the following steps:
acquiring vibration acceleration data of a target vehicle corresponding to the evaluation point in the preset direction;
carrying out Fourier transform on the vibration acceleration data to obtain acceleration frequency domain data;
carrying out frequency division calculation on the acceleration frequency domain data to obtain an acceleration frequency domain effective value;
and calculating an objective index item of the evaluation point according to the acceleration frequency domain effective value, and determining a smoothness evaluation result according to evaluation information fed back by a tester and the objective index item.
2. The method for evaluating the smoothness of an automobile according to claim 1, wherein the step of performing frequency division calculation on the acceleration frequency domain data to obtain an acceleration frequency domain effective value comprises the steps of;
performing frequency division processing on the frequency domain curve in the acceleration frequency domain data based on a preset frequency division point to obtain a frequency domain curve after frequency division;
and calculating the effective value of the frequency domain curve after frequency division to obtain the acceleration frequency domain effective value in a preset frequency domain range.
3. The method according to claim 2, wherein the objective index items include a first objective index item and a second objective index item, and the step of calculating the objective index item of the evaluation point according to the acceleration frequency domain effective value and determining the smoothness evaluation result according to the evaluation information fed back by the tester and the objective index item includes:
calculating a first objective index item and a second objective index item of the evaluation point according to the acceleration frequency domain effective value;
and determining a smoothness evaluation result according to the first-order vibration evaluation information and the second-order vibration evaluation information in the evaluation information fed back by the tester, the first objective index item and the second objective index item.
4. The method according to claim 3, wherein the preset frequency domain range includes a first frequency domain range and a second frequency domain range, the effective acceleration frequency domain value includes effective acceleration frequency domain values in a first direction, a second direction and a third direction, and the step of calculating the first objective index item and the second objective index item of the evaluation point according to the effective acceleration frequency domain value includes:
calculating a first objective index item of the evaluation point according to the acceleration frequency domain effective values in the first direction, the second direction and the third direction in the first frequency domain range;
calculating a second objective index item of the evaluation point according to the acceleration frequency domain effective values in the first direction, the second direction and the third direction in the second frequency domain range;
the step of determining the smoothness evaluation result according to the first order vibration evaluation information and the second order vibration evaluation information in the evaluation information fed back by the tester, the first objective index item and the second objective index item comprises the following steps:
determining a first evaluation item according to first-order vibration evaluation information in evaluation information fed back by a tester;
determining a second evaluation item according to second-order vibration evaluation information in the evaluation information fed back by the tester;
determining a first smoothness evaluation result according to the first objective index item and the first evaluation item;
determining a second smoothness evaluation result according to the second objective index item and the second evaluation item;
and determining a smoothness evaluation result according to the first smoothness evaluation result and the second smoothness evaluation result.
5. The method for evaluating the ride comfort of a vehicle according to claim 1, wherein after the step of calculating the objective index item of the evaluation point according to the effective value of the acceleration frequency domain and determining the ride comfort evaluation result according to the evaluation information fed back by the tester and the objective index item, the method further comprises:
comparing the smoothness evaluation result with an expected target, and determining whether the smoothness of the evaluation point needs to be improved or not according to the comparison result;
when the smoothness of the evaluation point needs to be improved, determining a smoothness fault frequency range according to the evaluation information and the objective index item;
and improving the system or the part corresponding to the evaluation point according to the ride comfort fault frequency range.
6. The method for evaluating the ride comfort of a vehicle of claim 5, wherein the step of determining whether the ride comfort of the evaluation point needs to be improved according to the comparison result comprises:
when the smoothness evaluation result does not reach the expected target, determining that the smoothness of the evaluation point needs to be improved;
determining that the smoothness of the evaluation point does not need to be improved when the smoothness evaluation result reaches the expected target.
7. The method for evaluating the ride comfort of a vehicle according to claim 5, wherein the step of improving the system or the component corresponding to the evaluation point according to the ride comfort fault frequency range comprises:
determining a fault system according to the ride comfort fault frequency range, and analyzing the fault system;
and determining a fault part according to the analysis result, and sending fault information corresponding to the fault part to a tester for improvement.
8. An automobile ride comfort evaluation apparatus, characterized by comprising: a memory, a processor and a vehicle ride comfort evaluation program stored on the memory and operable on the processor, the vehicle ride comfort evaluation program when executed by the processor implementing the steps of the vehicle ride comfort evaluation method according to any one of claims 1 to 7.
9. A storage medium having stored thereon a vehicle ride comfort evaluation program, which when executed by a processor, implements the steps of the vehicle ride comfort evaluation method according to any one of claims 1 to 7.
10. An automobile ride comfort evaluation device, characterized in that the automobile ride comfort evaluation device includes:
the data acquisition module is used for acquiring vibration acceleration data of the target vehicle in a preset direction corresponding to the evaluation point;
the frequency domain analysis module is used for carrying out Fourier transform on the vibration acceleration data to obtain acceleration frequency domain data;
the frequency domain analysis module is also used for carrying out frequency division calculation on the acceleration frequency domain data to obtain an acceleration frequency domain effective value;
and the smoothness evaluation module is used for calculating the objective index item of the evaluation point according to the acceleration frequency domain effective value and determining a smoothness evaluation result according to evaluation information fed back by a tester and the objective index item.
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