CN114577489A - Method for determining falling inclination angle and falling height in vehicle falling equivalent test - Google Patents
Method for determining falling inclination angle and falling height in vehicle falling equivalent test Download PDFInfo
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Abstract
The invention relates to a method for determining a falling inclination angle and a falling height in a vehicle falling equivalent test. The falling inclination angle determining method comprises the following steps: determining the rotation angular acceleration of the vehicle according to the axle load of the front axle of the vehicle, the axle load of the rear axle of the vehicle, the distance between the front axle of the vehicle and the mass center of the vehicle and the distance between the rear axle of the vehicle and the mass center of the vehicle; determining first time according to the falling speed of the vehicle and the wheel base of the vehicle; the first time is the time for the rear axle of the vehicle to move from an initial position to the top of the fall barrier; determining a second time and a third time according to the falling speed of the vehicle, the falling barrier inclination angle and the falling barrier height; and determining the falling inclination angle according to the rotation angular acceleration of the vehicle, the first time, the second time and the third time. The method can realize equivalent test of vehicle drop test, has simple test, small occupied area, no need of drop barriers and can quickly test different drop working conditions of different vehicles.
Description
Technical Field
The invention relates to the field of vehicle testing, in particular to a method for determining a falling inclination angle and a falling height in a vehicle falling equivalent test.
Background
At present, most of power battery packs of electric passenger vehicles adopt a sliding plate type structural form, and a power storage battery is arranged at the bottom of the vehicle. This type of construction brings certain advantages in terms of vehicle handling, weight reduction, and freedom of design. Meanwhile, when the vehicle passes through a rough road, the battery pack at the bottom is subjected to an impact load in the vertical direction. Traditional collision safety tests, such as front collision, side collision, tail collision and the like, are tests of impact load of the battery pack in the horizontal direction, and the whole vehicle safety performance of the electric passenger vehicle cannot be comprehensively tested due to the lack of the impact load test in the vertical direction. However, in an actual road traffic environment, when a vehicle passes through a speed bump or a road surface with a large drop, an impact load in a vertical direction is generated on the battery pack. For an electric passenger vehicle, a battery pack of the electric passenger vehicle is a high-risk energy storage component, and serious impact load may damage an installation structure or an internal structure of the battery pack, so that serious potential safety hazards are brought to the vehicle, and even dangerous situations such as direct ignition of the vehicle can be caused.
For the impact load test of the high-voltage battery pack, related test methods at home and abroad mainly focus on component level tests, namely, the high-voltage battery pack is independently subjected to related tests such as drop, sliding table impact and the like. For the test of the high-voltage battery pack, a component-level test or a whole-vehicle-level test is adopted, and the two tests have essential differences on the test method, such as the energy aspect of impact and the practical use environment aspect of the battery pack. By adopting the test of the whole vehicle level, the whole safety performance of the high-voltage battery pack and the whole vehicle structure arrangement can be reflected on the one hand, and on the other hand, the test is more close to the actual use working condition of the electric passenger vehicle. Therefore, in order to test the safety of the high-voltage battery pack and the safety of the electric passenger car with the high-voltage battery pack, it is necessary to invent a test method for the whole-car falling of the electric passenger car, and most of the existing whole-car falling test methods are based on statistical data, and have the defects of complex test, large occupied area and the like due to the fact that the falling scene basically consistent with the actual falling condition is reproduced by arranging falling barriers and accelerating the car.
In view of the above, the present invention is particularly proposed.
Disclosure of Invention
The invention aims to provide a method for determining a falling inclination angle and a falling height in a vehicle falling equivalent test, so as to realize the equivalent test of the vehicle falling test, and the method has the advantages of simple test, small occupied area, no need of falling barriers and capability of quickly testing different falling working conditions of different vehicles.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the invention provides a method for determining a drop inclination angle in a vehicle drop equivalence test, which comprises the following steps:
determining the rotation angular acceleration of the vehicle according to the axle load of the front axle of the vehicle, the axle load of the rear axle of the vehicle, the distance between the front axle of the vehicle and the mass center of the vehicle and the distance between the rear axle of the vehicle and the mass center of the vehicle;
determining first time according to the falling speed of the vehicle and the wheel base of the vehicle; the first time is the time when the rear axle of the vehicle moves from an initial position to the top end of the falling barrier, wherein the initial position refers to the position of the vehicle when the front axle of the vehicle is positioned at the top end of the falling barrier;
determining a second time and a third time according to the falling speed of the vehicle, the falling barrier inclination angle and the falling barrier height; the second time is the time when the front axle of the vehicle moves from the initial position to the same level as the initial position, and the third time is the time when the front axle of the vehicle moves from the same level as the initial position to the contact with the ground;
and determining the falling inclination angle according to the rotation angular acceleration of the vehicle, the first time, the second time and the third time.
In a second aspect, the present invention provides a method for determining a drop height in a vehicle drop equivalence test, including:
obtaining the falling inclination angle obtained in the method;
and determining the falling height according to the falling inclination angle, the falling speed of the vehicle and the falling barrier height.
In a third aspect, the present invention provides a device for determining a falling inclination angle in a vehicle falling equivalence test, including:
the vehicle rotation angular acceleration determining module is used for determining the vehicle rotation angular acceleration according to the vehicle front axle load, the vehicle rear axle load, the distance between the vehicle front axle and the vehicle mass center and the distance between the vehicle rear axle and the vehicle mass center;
the first time determination module is used for determining first time according to the falling speed of the vehicle and the wheelbase of the vehicle; the first time is the time when the rear axle of the vehicle moves from an initial position to the top end of the falling barrier, wherein the initial position refers to the position of the vehicle when the front axle of the vehicle is positioned at the top end of the falling barrier;
the second time and third time determining module is used for determining second time and third time according to the falling speed of the vehicle, the falling barrier inclination angle and the falling barrier height; the second time is the time when the front axle of the vehicle moves from the initial position to the same level as the initial position, and the third time is the time when the front axle of the vehicle moves from the same level as the initial position to the contact with the ground;
and the falling inclination angle determining module is used for determining a falling inclination angle according to the rotation angular acceleration of the vehicle, the first time, the second time and the third time.
In a fourth aspect, the present invention provides a device for determining a drop height in a vehicle drop equivalence test, including:
the falling inclination angle acquisition module is used for acquiring the falling inclination angle obtained in the method;
and the falling height determining module is used for determining the falling height according to the falling inclination angle, the vehicle falling speed and the falling barrier height.
In a fifth aspect, the present invention provides an electronic device, comprising:
at least one processor, and a memory communicatively coupled to at least one of the processors;
wherein the memory stores instructions executable by the at least one processor to enable the at least one processor to perform a method of determining a drop inclination angle in a vehicle drop equivalence test or a method of determining a drop height in a vehicle drop equivalence test.
In a sixth aspect, the present invention provides a computer-readable storage medium having stored thereon computer instructions for causing a computer to execute the method for determining a drop inclination angle in the above-mentioned vehicle drop equivalence test or the method for determining a drop height in the above-mentioned vehicle drop equivalence test.
Compared with the prior art, the invention has the beneficial effects that:
the method for determining the falling inclination angle in the vehicle falling equivalent test determines the rotation angular acceleration, the first time, the second time and the third time of the vehicle according to each element or parameter, and finally determines the falling inclination angle according to the determined parameters, so that the falling inclination angle in the equivalent test can be quickly, simply and conveniently calculated, and the subsequent equivalent test is convenient.
The method for determining the falling height in the vehicle falling equivalent test provided by the invention combines the falling inclination angle obtained in the front, the vehicle falling speed and the falling barrier height in the test working condition, and determines the falling height.
The method can quickly calculate the falling inclination angle and the falling height in the equivalent test, and the vehicle is only required to be placed on the corresponding test bench according to the falling inclination angle and the falling height during the test without arranging a falling barrier, accelerating the vehicle and the like, so that the test is quick and convenient, the occupied area is small, and the test cost is greatly reduced.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a flowchart of a method for determining a falling inclination angle in a vehicle falling equivalence test provided in embodiment 1;
FIG. 2 is a simplified model of a vehicle;
FIG. 3 is a schematic view of a vehicle history at a first time during a fall;
FIG. 4 is a schematic view of a vehicle history at a second time during a fall;
FIG. 5 is a velocity component plot of the front axle at an initial position;
FIG. 6 is a schematic view of the vehicle history at a third time during the fall;
FIG. 7 is t3Velocity component plot of front axle at phase start;
FIG. 8 is a flowchart of a method for determining a drop height in a vehicle drop equivalence test provided in embodiment 2;
FIG. 9 is a schematic diagram of an energy analysis of a vehicle during a fall;
FIG. 10 is a drop equivalent test schematic in accordance with the present invention;
FIG. 11 is a schematic structural view of a device for determining a falling inclination angle in a vehicle falling equivalence test, provided in embodiment 3;
FIG. 12 is a schematic structural view of a device for determining a drop height in a vehicle drop equivalence test, provided in embodiment 4;
fig. 13 is a schematic structural diagram of an electronic device provided in embodiment 5.
Detailed Description
The following description of the exemplary embodiments of the present application, taken in conjunction with the accompanying drawings, includes various details of the embodiments of the application for the understanding of the same, which are to be considered exemplary only. Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the embodiments described herein can be made without departing from the scope and spirit of the present application. Also, descriptions of well-known functions and constructions are omitted in the following description for clarity and conciseness.
Description of each parameter in this example: m-rotational moment of the vehicle about the center of mass of the vehicle, M1Front axle load of vehicle, m2Vehicle rear axle load, L1Distance of the vehicle front axle from the vehicle center of mass, L2Distance of the rear axle of the vehicle from the center of mass of the vehicle, I-moment of inertia of the vehicle about the center of mass of the vehicle, beta-rotational angular acceleration of the vehicle, t1A first time, t2A second time, t3-a third time, θ -the fall barrier inclination angle; v. of0-vehicle drop speed; h-height of the falling barrier, g-acceleration of gravity, theta1-a first angle of rotation, θ2-a second angle of rotation, α -drop inclination, H-drop height, ω1First angular velocity of rotation, ω, of the vehicle2-a second angular velocity of rotation of the vehicle.
As mentioned above, the existing testing method has the disadvantages of complex testing, large floor space, etc., so in order to reduce the implementation difficulty of the drop test and improve the convenience of the drop test, a rack testing method (i.e., a vehicle drop equivalent testing method) related to the whole vehicle drop test needs to be formed by using an energy equivalent method. In the vehicle drop equivalent test, a drop inclination angle (namely, an included angle between a vehicle and the ground at the moment of contact between the vehicle and the ground) and a drop height are very important parameters in the drop test, and the accuracy of a test result is directly influenced. Therefore, the present embodiment focuses on how to determine the fall inclination angle and the fall height.
Example 1
Fig. 1 is a flowchart of a method for determining a falling inclination angle in a vehicle falling equivalence test according to the embodiment. The method can be performed by a device for determining the dip angle of a vehicle in a drop equivalent test, which can be constituted by software and/or hardware and is generally integrated in an electronic apparatus.
Referring to fig. 1, the method for determining a falling inclination angle in a vehicle falling equivalence test includes the following steps:
and S110, determining the rotation angular acceleration of the vehicle according to the axle load of the front axle of the vehicle, the axle load of the rear axle of the vehicle, the distance between the front axle of the vehicle and the mass center of the vehicle and the distance between the rear axle of the vehicle and the mass center of the vehicle.
The "axle load of the front axle of the vehicle" refers to the load borne by the front axle of the vehicle, and can be obtained by measuring through an axle load instrument. The "axle load of the rear axle of the vehicle" refers to the load borne by the rear axle of the vehicle and can be obtained by measuring an axle load instrument. "distance of the vehicle front axle from the vehicle center of mass" means the horizontal distance between the front axle and the vehicle center of mass when the vehicle is positioned on the horizontal plane. "distance of the vehicle rear axle from the vehicle center of mass" means the horizontal distance between the rear axle and the vehicle center of mass when the vehicle is positioned on the horizontal plane. The distance between the front axle of the vehicle and the center of mass of the vehicle and the distance between the rear axle of the vehicle and the center of mass of the vehicle are obtained by directly calculating by using the axle load of the front axle, the axle load of the rear axle and the wheel base of the vehicle. The "vehicle rotation angular acceleration" refers to an angular acceleration at which the vehicle rotates in the first time.
Alternatively, the vehicle angular acceleration may be calculated by installing an angular velocity sensor on the vehicle body, acquiring an angular velocity variation curve of the vehicle, and then deriving the time.
Preferably, the determining the vehicle rotation angular acceleration according to the vehicle front axle load, the vehicle rear axle load, the distance between the vehicle front axle and the vehicle mass center, and the distance between the vehicle rear axle and the vehicle mass center comprises:
determining the rotating moment of the vehicle around the vehicle mass center according to the vehicle front axle load and the distance between the vehicle front axle and the vehicle mass center;
determining the moment of inertia of the vehicle rotating around the vehicle mass center according to the vehicle front axle load, the vehicle rear axle load, the distance between the vehicle front axle and the vehicle mass center and the distance between the vehicle rear axle and the vehicle mass center;
and determining the rotation angular acceleration of the vehicle according to the rotation moment and the moment of inertia.
A simplified model of a vehicle is shown in fig. 2.
When the vehicle falls off, the front axle of the vehicle is influenced by gravity in the first time (as shown in fig. 3) and after the front axle of the vehicle drives away from the falling barrier, the vehicle can generate a rotating moment M around the center of mass, wherein M is M1gL1(equation 1).
The simplified moment of inertia I of the vehicle rotating around the center of mass of the vehicle is as follows:
the vehicle rotation angular acceleration β can be calculated from equation 1 and equation 2:
after the first time course is completed, when the rear axle of the vehicle leaves the barrier, the vehicle is not subjected to the rotating moment of the front axle due to the loss of the supporting force of the barrier, namely, the vehicle rotates around the center of mass of the vehicle according to the existing angular velocity until the front axle is contacted with the ground.
S120, determining first time according to the falling speed and the wheelbase of the vehicle; the first time is the time when the rear axle of the vehicle moves from an initial position to the top end of the falling barrier, wherein the initial position is the position of the vehicle when the front axle of the vehicle is positioned at the top end of the falling barrier.
The vehicle falling speed refers to the speed of the vehicle falling from the barrier in the actual working condition simulated in the equivalent test.
Referring to FIG. 3, a first time t1Is a vehicleThe time for the rear axle of the vehicle to move from the initial position to the top of the fall barrier is shown in phantom since the movement of the front axle is not considered.
S130, determining a second time and a third time according to the falling speed of the vehicle, the falling barrier inclination angle and the falling barrier height; the second time is the time when the front axle of the vehicle moves from the initial position to the same level as the initial position, and the third time is the time when the front axle of the vehicle moves from the same level as the initial position to contact with the ground.
Preferably, the determining the second time and the third time according to the vehicle falling speed, the falling barrier inclination angle and the falling barrier height comprises:
determining a second time according to the falling speed of the vehicle and the falling barrier inclination angle;
and determining the third time according to the falling speed of the vehicle, the falling barrier inclination angle and the falling barrier height.
Referring to FIG. 4, the second time t2For the time when the front axle of the vehicle moves from the initial position to the same level as the initial position, the portion behind the front axle is indicated by a dotted line since the movement of the rear axle is not considered.
Referring to FIG. 5, which is a velocity component diagram of the front axle at the initial position, it can be seen from FIG. 5 that vz＝v0sin θ, using velocity and time calculation formula Vt＝V0+ at; wherein: v0＝vz，VtWhen the value is 0, a represents the acceleration of gravity g.
The gravity acceleration g is taken as 10, and the time t can be obtained2：
Referring to FIG. 6, a third time t3The time for moving the front axle of the vehicle from the same level as the initial position to the contact with the ground is not consideredThe movement of the rear axle is taken into account, so the part behind the front axle is shown by a dashed line.
See FIG. 7 for t3Velocity component diagram of front axle at the beginning of phase, expressed by formula
The vertical speed v of the front axle contacting with the ground can be obtainedt。
Using velocity and time calculation formula Vt＝V0+ at; wherein: v0＝vzAnd a is the gravitational acceleration g.
The gravity acceleration g is taken as 10, and the time t can be obtained3：
From equations 4, 5 and 6, the time t1In relation to the wheelbase and the falling speed of the vehicle, the longer the wheelbase, the higher the falling speed, the longer the vehicle is1The larger. Time t2And t3In relation to the speed of the vehicle falling and the overall dimensions of the barrier, a higher speed corresponds to a longer time without changing the overall dimensions of the barrier.
And S140, determining the falling inclination angle according to the rotation angular acceleration of the vehicle, the first time, the second time and the third time.
Preferably, the vehicle drop test categories include a first category and a second category, the first category is that the sum of the second time and the third time is greater than or equal to the first time, and the second category is that the sum of the second time and the third time is less than the first time;
if the vehicle drop test type is a first type, determining a first rotation angular velocity of the vehicle according to the rotation angular acceleration and the first time of the vehicle; determining a first rotation angle according to the first rotation angular velocity and the first time of the vehicle; determining a second rotation angle according to the first rotation angular velocity, the first time, the second time and the third time of the vehicle; determining a falling inclination angle according to the first rotation angle and the second rotation angle;
if the vehicle drop test type is a second type, determining a second rotation angular velocity of the vehicle according to the rotation angular acceleration of the vehicle, the second time and the third time; and determining a falling inclination angle according to the second rotation angular speed, the second time and the third time of the vehicle.
According to the analysis, the falling time of the front axle of the vehicle is t2+t3. According to the different types of vehicles, namely the length of the wheel base of the vehicle, the falling process of the vehicle can be divided into two conditions: case 1 is t2+t3≥t1(ii) a Case 2 is t2+t3＜t1. Next, the falling inclination angle α of the vehicle is calculated for each of the two cases.
Case 1: t is t2+t3≥t1
In this case, the rotation angle of the vehicle includes two portions, one being a uniform acceleration rotation before the rear axle of the vehicle leaves the barrier; one part is the uniform rotation of the rear axle of the vehicle after the rear axle leaves the barrier.
For the uniform acceleration rotation process of the first part, the vehicle rotation angle calculation process is as follows:
from the equations 4 and 5, the first angular velocity ω of rotation of the vehicle at the angular velocity ω can be calculated1。
From equations 4 and 7, the first rotation angle of the vehicle can be calculated
For the uniform rotation process of the second part, the vehicle rotation angle calculation process is as follows:
the remaining time of falling of the front axle is
t＝t2+t3-t1(formula 9)
From equations 7 and 9, the second rotation angle of the vehicle can be calculated
From the formulas 8 and 10, the falling inclination angle of the vehicle can be calculated
α＝θ1+θ2- θ (equation 11)
Case 2: t is t2+t3＜t1
In this case, the rotation angle of the vehicle is only the uniform acceleration rotation before the rear axle of the vehicle leaves the barrier.
From the equations 3, 5 and 6, the second angular velocity ω of rotation of the vehicle can be calculated2。
Meanwhile, the falling inclination angle of the vehicle can be calculated
In order to verify the rationality of the derivation process, the following verification calculation is performed on an actually measured vehicle model. Table 1 shows the relevant parameters of the measured vehicle model.
TABLE 1 test vehicle model parameters
| Parameter name | Numerical value | Parameter name | Numerical value |
| Front axle load | 433Kg | Initial velocity | 11.11m/s |
| Rear axle load | 450Kg | Height of barrier | 0.313m |
| Distance from front axle to center of mass | 0.989m | Barrier dip sine value | 0.105 |
| Distance from rear axle to center of mass | 0.951m | Wheelbase | 1.94m |
From the data in Table 1, t can be calculated1，t2And t3. The calculation results are as follows:
t1＝0.175s
t2＝0.233s
t3＝0.16s
due to t2+t3＞t1FromThe falling inclination angle α of the vehicle can be calculated by using the following equations 8, 10 and 11, where α is 0.249rad
After converting α into an angle, α becomes 14.27 °
In a drop test of the vehicle, the actually collected vehicle drop inclination angle is 12 degrees. Through comparison, the difference between the calculated falling inclination angle and the actually acquired falling inclination angle is only 2.27 degrees, and the use requirement is met.
The method for determining the falling inclination angle in the vehicle falling equivalent test determines the rotation angular acceleration, the first time, the second time and the third time of the vehicle according to each element or parameter, and finally determines the falling inclination angle according to the determined parameters, so that the falling inclination angle in the equivalent test can be quickly and simply calculated, and the subsequent equivalent test is convenient to perform.
Example 2
Referring to fig. 8, the present embodiment provides a method for determining a drop height in a vehicle drop equivalence test, including:
and S210, acquiring a falling inclination angle.
The fall inclination angle was determined using the method of example 1.
And S220, determining the falling height according to the falling inclination angle, the falling speed of the vehicle and the falling barrier height.
The moment the vehicle falls into contact with the ground, the energy distribution of the vehicle is as shown in fig. 9.
As can be seen from fig. 9, when the vehicle falls and contacts the ground, the total energy E of the vehicle is:
energy distribution E of the vehicle in the vertical directionzComprises the following steps:
as can be seen from FIG. 10, after the vehicle is lifted to the drop height, the vehicle is liftedPotential energy in the vertical direction EzComprises the following steps:
EzmgH (equation 15)
From equations 14 and 15, one can see:
from equation 16, the final vehicle drop height is determined by the initial velocity v0The falling inclination angle alpha and the barrier height h at the moment of contact between the vehicle and the ground. Therefore, after the falling inclination angle is known, the initial speed v under the falling working condition is combined0And the height h of the barrier, and the falling height can be calculated according to the formula 16.
Through the above conversion method, the rotation angle alpha of the vehicle is obtained through calculation for different vehicle types, and then the initial speed v of the vehicle is used0And the height h of the barrier, and the falling height after conversion can be obtained by using a formula 16. Therefore, vertical drop tests of different vehicle types under different speed working conditions are realized.
Example 3
Referring to fig. 11, the present embodiment provides an apparatus for determining a falling inclination angle in a vehicle falling equivalence test, including:
the vehicle rotation angular acceleration determining module 101 is used for determining the vehicle rotation angular acceleration according to the vehicle front axle load, the vehicle rear axle load, the distance between the vehicle front axle and the vehicle mass center and the distance between the vehicle rear axle and the vehicle mass center;
the first time determination module 102 is used for determining a first time according to the vehicle falling speed and the vehicle wheelbase; the first time is the time that a rear axle of the vehicle moves from an initial position to the top end of the falling barrier, wherein the initial position refers to the position of the vehicle when a front axle of the vehicle is positioned at the top end of the falling barrier;
the second time and third time determining module 103 is used for determining second time and third time according to the falling speed of the vehicle, the falling barrier inclination angle and the falling barrier height; the second time is the time when the front axle of the vehicle moves from the initial position to the same level as the initial position, and the third time is the time when the front axle of the vehicle moves from the same level as the initial position to the contact with the ground;
and a fall inclination angle determination module 104 for determining a fall inclination angle according to the vehicle rotation angular acceleration, the first time, the second time and the third time.
The apparatus is used to perform the method described in embodiment 1, and thus has at least functional blocks and advantageous effects corresponding to the above-described method.
Example 4
Referring to fig. 12, the present embodiment provides an apparatus for determining a drop height in a vehicle drop equivalence test, including:
a falling inclination angle obtaining module 201, configured to obtain a falling inclination angle obtained in the method in embodiment 1;
and the falling height determining module 202 is used for determining the falling height according to the falling inclination angle, the vehicle falling speed and the falling barrier height.
The apparatus is used to perform the method described in embodiment 2, and thus has at least functional blocks and advantageous effects corresponding to the above-described method.
Example 5
As shown in fig. 13, the present embodiment provides an electronic apparatus including:
at least one processor; and
a memory communicatively coupled to at least one of the processors; wherein,
the memory stores instructions executable by at least one of the processors to enable the at least one of the processors to perform the method described above. The at least one processor in the electronic device is capable of performing the above method and thus has at least the same advantages as the above method.
Optionally, the electronic device further includes an interface for connecting the components, including a high-speed interface and a low-speed interface. The various components are interconnected using different buses and may be mounted on a common motherboard or in other manners as desired. The processor may process instructions for execution within the electronic device, including instructions stored in or on the memory to display Graphical information for a GUI (Graphical User Interface) on an external input/output device, such as a display device coupled to the Interface. In other embodiments, multiple processors may be used with multiple memories, and/or multiple buses may be used with multiple memories, if desired. Also, multiple electronic devices may be connected (e.g., as an array of servers, a group of blade servers, or a multi-processor system), with each device providing some of the necessary operations. Fig. 13 illustrates an example of one processor 301.
The memory 302 is a computer-readable storage medium, and can be used for storing software programs, computer-executable programs, and modules, such as program instructions/modules corresponding to the method for determining a drop inclination angle in a vehicle drop equivalence test or the method for determining a drop height in a vehicle drop equivalence test in the embodiment of the present invention. The processor 301 executes various functional applications of the device and data processing by executing software programs, instructions and modules stored in the memory 302, that is, implements the above-described method.
The memory 302 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application program required for at least one function; the storage data area may store data created according to the use of the terminal, and the like. Further, the memory 302 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. In some examples, the memory 302 may further include memory located remotely from the processor 301, which may be connected to the device over a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The electronic device may further include: an input device 303 and an output device 304. The processor 301, the memory 302, the input device 303 and the output device 304 may be connected by a bus or other means, and fig. 13 illustrates the connection by a bus as an example.
The input device 303 may receive input numeric or character information, and the output device 304 may include a display device, an auxiliary lighting device (e.g., an LED), a tactile feedback device (e.g., a vibration motor), and the like. The display device may include, but is not limited to, a Liquid Crystal Display (LCD), a Light Emitting Diode (LED) display, and a plasma display. In some implementations, the display device can be a touch screen.
Example 6
The present embodiments provide a computer-readable storage medium having stored thereon computer instructions for causing the computer to perform the above-described method. The computer instructions on the computer-readable storage medium are for causing a computer to perform the above-described method and thus have at least the same advantages as the above-described method.
The medium of the present invention may take the form of any combination of one or more computer-readable media. The medium may be a computer readable signal medium or a computer readable storage medium. The medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the foregoing. More specific examples (a non-exhaustive list) of the medium include: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In the context of this document, a medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
A computer readable signal medium may include a propagated data signal with computer readable program code embodied therein, for example, in baseband or as part of a carrier wave. Such a propagated data signal may take many forms, including, but not limited to, electro-magnetic, optical, or any suitable combination thereof. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device.
Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF (Radio Frequency), etc., or any suitable combination of the foregoing.
Computer program code for carrying out operations for aspects of the present invention may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, Smalltalk, C + +, or the like, as well as conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or the connection may be made to an external computer (for example, through the Internet using an Internet service provider).
It should be understood that various forms of the flows shown above, reordering, adding or deleting steps, may be used. For example, the steps described in the present application may be executed in parallel, sequentially, or in different orders, as long as the desired results of the technical solutions disclosed in the present application can be achieved, and the present invention is not limited herein.
The above-described embodiments should not be construed as limiting the scope of the present application. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions may be made in accordance with design requirements and other factors. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. A method for determining a falling inclination angle in a vehicle falling equivalent test is characterized by comprising the following steps:
determining the rotation angular acceleration of the vehicle according to the axle load of the front axle of the vehicle, the axle load of the rear axle of the vehicle, the distance between the front axle of the vehicle and the mass center of the vehicle and the distance between the rear axle of the vehicle and the mass center of the vehicle;
determining first time according to the falling speed of the vehicle and the wheel base of the vehicle; the first time is the time when the rear axle of the vehicle moves from an initial position to the top end of the falling barrier, wherein the initial position refers to the position of the vehicle when the front axle of the vehicle is positioned at the top end of the falling barrier;
determining a second time and a third time according to the falling speed of the vehicle, the falling barrier inclination angle and the falling barrier height; the second time is the time when the front axle of the vehicle moves from the initial position to the same level as the initial position, and the third time is the time when the front axle of the vehicle moves from the same level as the initial position to contact with the ground;
and determining the falling inclination angle according to the rotation angular acceleration of the vehicle, the first time, the second time and the third time.
2. The method for determining a falling inclination angle in a vehicle falling equivalence test according to claim 1, wherein the determining the vehicle rotation angular acceleration according to the vehicle front axle load, the vehicle rear axle load, the distance between the vehicle front axle and the vehicle center of mass, and the distance between the vehicle rear axle and the vehicle center of mass comprises:
determining the rotating moment generated by the vehicle around the vehicle mass center according to the vehicle front axle load and the distance between the vehicle front axle and the vehicle mass center;
determining the moment of inertia of the vehicle rotating around the vehicle mass center according to the vehicle front axle load, the vehicle rear axle load, the distance between the vehicle front axle and the vehicle mass center and the distance between the vehicle rear axle and the vehicle mass center;
and determining the rotation angular acceleration of the vehicle according to the rotation moment and the moment of inertia.
3. The method for determining a falling inclination angle in a vehicle falling equivalence test according to claim 1, wherein the determining the second time and the third time according to the vehicle falling speed, the falling barrier inclination angle and the falling barrier height comprises:
determining a second time according to the falling speed of the vehicle and the falling barrier inclination angle;
and determining the third time according to the falling speed of the vehicle, the falling barrier inclination angle and the falling barrier height.
4. The method for determining a falling inclination angle in a vehicle falling equivalence test according to any one of claims 1-3, wherein the determining a falling inclination angle according to a vehicle rotation angular acceleration, a first time, a second time and a third time comprises:
determining the vehicle drop test type according to the first time, the second time and the third time;
and determining a falling inclination angle according to the vehicle falling test type and the vehicle rotation angular acceleration.
5. The method for determining a falling inclination angle in a vehicle falling equivalence test according to claim 4, wherein the vehicle falling test category includes a first category and a second category, the first category is that the sum of a second time and a third time is greater than or equal to a first time, the second category is that the sum of the second time and the third time is less than the first time;
if the vehicle drop test type is a first type, determining a first rotation angular velocity of the vehicle according to the rotation angular acceleration and the first time of the vehicle; determining a first rotation angle according to the first rotation angular velocity and the first time of the vehicle; determining a second rotation angle according to the first rotation angular velocity, the first time, the second time and the third time of the vehicle; determining a falling inclination angle according to the first rotation angle and the second rotation angle;
if the vehicle falling test type is a second type, determining a second rotation angular velocity of the vehicle according to the rotation angular acceleration of the vehicle, the second time and the third time; and determining a falling inclination angle according to the second rotation angular velocity, the second time and the third time of the vehicle.
6. A method for determining a falling height in a vehicle falling equivalent test is characterized by comprising the following steps:
obtaining the dip angle of the fall obtained in the method of any one of claims 1-5;
and determining the falling height according to the falling inclination angle, the falling speed of the vehicle and the falling barrier height.
7. The utility model provides a device for confirming that falls inclination in vehicle falls equivalence test which characterized in that includes:
the vehicle rotation angular acceleration determining module is used for determining the vehicle rotation angular acceleration according to the vehicle front axle load, the vehicle rear axle load, the distance between the vehicle front axle and the vehicle mass center and the distance between the vehicle rear axle and the vehicle mass center;
the first time determination module is used for determining first time according to the falling speed of the vehicle and the wheelbase of the vehicle; the first time is the time when the rear axle of the vehicle moves from an initial position to the top end of the falling barrier, wherein the initial position refers to the position of the vehicle when the front axle of the vehicle is positioned at the top end of the falling barrier;
the second time and third time determining module is used for determining the second time and the third time according to the falling speed of the vehicle, the falling barrier inclination angle and the falling barrier height; the second time is the time when the front axle of the vehicle moves from the initial position to the same level as the initial position, and the third time is the time when the front axle of the vehicle moves from the same level as the initial position to the contact with the ground;
and the falling inclination angle determining module is used for determining a falling inclination angle according to the rotation angular acceleration of the vehicle, the first time, the second time and the third time.
8. A device for determining the falling height in a vehicle falling equivalent test is characterized by comprising:
a fall inclination angle acquisition module for acquiring a fall inclination angle obtained in the method of any one of claims 1 to 5;
and the falling height determining module is used for determining the falling height according to the falling inclination angle, the vehicle falling speed and the falling barrier height.
9. An electronic device, comprising:
at least one processor, and a memory communicatively coupled to at least one of the processors;
wherein the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the method of determining a roll off inclination in a vehicle drop equivalence test of any one of claims 1-5 or the method of determining a roll off height in a vehicle drop equivalence test of claim 6.
10. A computer-readable storage medium having stored thereon computer instructions for causing a computer to execute the method for determining a drop inclination angle in a vehicle drop equivalence test according to any one of claims 1-5 or the method for determining a drop height in a vehicle drop equivalence test according to claim 6.
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