CN114818411A - Method, storage medium, equipment and device for predicting and analyzing friction abnormal sound of vehicle door sealing strip - Google Patents
Method, storage medium, equipment and device for predicting and analyzing friction abnormal sound of vehicle door sealing strip Download PDFInfo
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Abstract
The invention discloses a method, a storage medium, equipment and a device for predicting and analyzing abnormal frictional sound of a vehicle door sealing strip, and belongs to the technical field of automobile manufacturing. The method comprises the following steps: s100, testing the friction characteristic of the vehicle door sealing strip to obtain the stick-slip displacement generated in the friction test process of the vehicle door sealing strip and the painted surface metal plate; s200, carrying out excitation response analysis on a vehicle body system, and calculating the relative displacement of the vehicle door and the vehicle body under an excitation condition; s300, carrying out the risk evaluation of the abnormal friction sound of the sealing strip of the vehicle door according to the relative displacement of the vehicle door and the vehicle body under the excitation condition and the stick-slip displacement generated in the friction test process of the sealing strip of the vehicle door and the painted surface metal plate. The method considers the influence of the comprehensive factors such as the friction characteristic of the sealing strip and the structural characteristic of the vehicle body on the abnormal friction sound of the sealing strip of the vehicle door, obtains the structural characteristic of the vehicle body and the friction characteristic of the sealing strip through simulation analysis and test, and can realize the abnormal sound risk prediction and evaluation of the sealing strip in a special vehicle body installation state.
Description
Technical Field
The invention relates to a method, a storage medium, equipment and a device for predicting and analyzing abnormal frictional sound of a vehicle door sealing strip, and belongs to the technical field of automobile manufacturing.
Background
The method is mainly used for analyzing the possibility of the sealing strip friction abnormal sound in an isolated manner aiming at the test analysis of the sealing strip friction characteristic.
The abnormal sound of the sealing strip of the car door is a high problem in various abnormal sound problems of the car, and once the abnormal sound occurs, the later stage is difficult to solve, the abnormal sound problem is weakened mainly by optimizing the surface friction characteristic of the sealing strip, the effective time is short, the improvement effect is not good, and the cost is high. The current lack the prediction analysis means to in the door sealing strip abnormal sound problem trade, prior art mainly tests to sealing strip friction abnormal sound to judge the good or bad of sealing strip frictional characteristic, can not combine the automobile body structure to the sealing strip friction abnormal sound risk under the whole car condition and carry out prediction analysis.
The prior patent CN112748065A describes a method for testing the friction abnormal sound characteristic of a sealing strip, which mainly restricts the method for testing the friction abnormal sound characteristic of the sealing strip and a painted surface metal plate, and comprises the steps of surface treatment of a tested piece, clamping of the tested piece, excitation signal type, test environment, test process and the like.
Also, for example, patent CN110263414 describes a method for identifying a friction abnormal sound danger point of an automotive interior trim part, the technology utilizes a simulation analysis method to calculate an excitation response of an interior trim system, and then combines a friction characteristic of the interior trim part with a displacement condition generating stick-slip to identify the friction abnormal sound danger point of the interior trim system, the friction characteristic test of the interior trim part in the method cannot effectively simulate a system stiffness characteristic, so that the obtained stick-slip displacement condition does not conform to a real system, and is approximately equivalent by a numerical simulation method, and a certain error exists.
Disclosure of Invention
The invention provides a method, a storage medium, equipment and a device for predicting and analyzing abnormal frictional sound of a vehicle door sealing strip, which solve the problems in the prior art.
A method for predicting and analyzing the friction abnormal sound of a vehicle door sealing strip comprises the following steps:
s100, testing the friction characteristic of the vehicle door sealing strip to obtain the stick-slip displacement generated in the friction test process of the vehicle door sealing strip and the painted surface metal plate;
s200, carrying out excitation response analysis on a vehicle body system, and calculating the relative displacement of the vehicle door and the vehicle body under an excitation condition;
s300, carrying out the risk evaluation of the abnormal friction sound of the sealing strip of the vehicle door according to the relative displacement of the vehicle door and the vehicle body under the excitation condition and the stick-slip displacement generated in the friction test process of the sealing strip of the vehicle door and the painted surface metal plate.
Further, in S100, the method specifically includes the following steps:
s110, acquiring information of compression amount, compression load and rigidity of the vehicle door sealing strip in a closed state of a vehicle door;
step S120, preparing a test piece: the tested piece comprises a vehicle door sealing strip and a painted metal plate test piece, wherein the vehicle door sealing strip is obtained by cutting the complete vehicle door sealing strip; the surface of the painted metal plate test piece needs to be processed to be the same as the paint of the whole vehicle;
step S130, clamping and friction characteristic testing of the tested piece are carried out: the door sealing strip and the painted surface metal plate test piece are respectively restrained and fixed on the material friction test system by a clamp, so that the matching of the contact area of the door sealing strip and the painted surface metal plate test piece is ensured, and the compression amount of the door sealing strip is the same as that in the closed state of the door; selecting N sliding speeds during testing, enabling the vehicle door sealing strip to slide relative to the painted metal plate along the direction perpendicular to the length direction of the vehicle door sealing strip, and testing and recording a friction force change curve changing along with time;
step S140, data analysis is carried out: counting the slippage displacement of the stick-slip in the friction test process of the vehicle door sealing strip and the painted surface metal plate test piece, wherein the slippage occurs once every time the friction force fluctuates according to a friction force change curve changing along with time, taking the average value of 10 slippage lengths, and taking the slippage displacement at N slippage speeds as the minimum value.
Further, in S120, specifically, the cut length of the door weather strip is 5cm, and the surface is required to be clean and not damaged; the size of the painted sheet metal test piece is 5cm x 3 cm.
Further, in S200, the method specifically includes the following steps:
step S210, building a dynamic deformation calculation analysis model of the vehicle door and the vehicle body: establishing a simulation model of the vehicle door and the vehicle body, and simulating the positions of a restraint door lock and a hinge between the vehicle door and the vehicle body by using a hinge model; simulating the door sealing strip by using the elastic unit according to the information of the compression amount, the compression load and the rigidity of the door sealing strip in the closed state of the door in the step S110;
step S220, obtaining an excitation signal: collecting vibration acceleration signals at key connection points of a vehicle body and a suspension of the same vehicle type, namely connection points of front and rear four vibration absorbers and the vehicle body, performing two-time high-pass filtering and integration on the collected vibration acceleration signals to obtain displacement signals of four points, and using the displacement signals as model excitation signals;
and step S230, applying forced displacement excitation to the connection points of the four vibration absorbers and the vehicle body of the model by using a transient dynamics calculation method, and calculating the relative displacement of the vehicle door and the vehicle body under the excitation condition.
Further, in S300, specifically: and comparing the calculated relative displacement of the vehicle door and the vehicle body under the excitation condition with the stick-slip displacement generated in the friction test process of the vehicle door sealing strip and the painted surface metal plate, and when the relative displacement of the vehicle door and the vehicle body under the excitation condition exceeds the slip displacement, indicating that the risk of friction abnormal sound exists between the vehicle door sealing strip and the vehicle body.
A storage medium having stored thereon a computer program which, when executed by a processor, implements the method described above.
An electronic device comprising a memory and a processor, the memory having stored thereon a computer program for execution on the processor, the processor implementing the method when executing the computer program.
A device for predicting and analyzing the frictional abnormal sound of a sealing strip of a vehicle door comprises a testing module for the frictional characteristic of the sealing strip of the vehicle door, an analysis module for the excitation response of a vehicle body system and a risk evaluation module for the frictional abnormal sound of the sealing strip of the vehicle door,
the vehicle door sealing strip friction characteristic testing module is used for acquiring the stick-slip sliding displacement generated in the friction testing process of the vehicle door sealing strip and the painted surface metal plate;
the vehicle body system excitation response analysis module is used for calculating the relative displacement of the vehicle door and the vehicle body under the excitation condition;
and the door sealing strip friction abnormal sound risk assessment module is used for carrying out door sealing strip friction abnormal sound risk assessment according to the relative displacement of the door and the vehicle body under the excitation condition and the slippage displacement of the door sealing strip and the paint surface metal plate in the friction test process.
Further, the vehicle door sealing strip friction characteristic testing module comprises a vehicle door sealing strip state obtaining unit, a tested piece preparing unit, a tested piece clamping and friction characteristic testing unit and a data analyzing unit, wherein,
the vehicle door sealing strip state acquiring unit is used for acquiring the compression amount, the compression load and the rigidity information of the vehicle door sealing strip in a vehicle door closing state;
the tested piece preparation unit is used for intercepting the vehicle door sealing strip and processing the surface of the painted metal plate test piece to be the same as the painted surface of the whole vehicle;
the tested piece clamping and friction characteristic testing unit is used for respectively fixing the vehicle door sealing strip and the painted surface metal plate test piece on the material friction testing system in a restraining mode through a clamp, so that the vehicle door sealing strip and the painted surface metal plate slide relatively along the direction perpendicular to the length direction of the vehicle door sealing strip, and a friction force change curve changing along with time is tested and recorded;
the data analysis unit is used for counting the slipping displacement of the car door sealing strip and the painted surface metal plate test piece in the process of friction test, and according to a friction force change curve changing along with time, when slipping occurs once, the friction force fluctuates once at a peak value, the average value of 10 times of slipping length is taken, and the slipping displacement under N sliding speeds is taken as the minimum value.
Further, the vehicle body system excitation response analysis module comprises a vehicle door and vehicle body dynamic deformation calculation analysis model establishing unit, an excitation signal acquiring unit and a vehicle door and vehicle body relative displacement calculating unit, wherein,
the dynamic deformation calculation analysis model building unit of the vehicle door and the vehicle body is used for building a simulation model of the vehicle door and the vehicle body, wherein the positions of a restraint door lock and a hinge between the vehicle door and the vehicle body are simulated by utilizing a hinge model; simulating the door sealing strip by using an elastic unit according to the information of the compression amount, the compression load and the rigidity of the door sealing strip in the closed state of the door;
the excitation signal acquisition unit is used for acquiring vibration acceleration signals of key connection points of a vehicle body and a suspension of the same vehicle type, namely connection points of front and rear four vibration absorbers and the vehicle body, performing high-pass filtering and integration on the acquired vibration acceleration signals twice to obtain displacement signals of four points, and using the displacement signals as model excitation signals;
the vehicle door and vehicle body relative displacement calculation unit is used for applying forced displacement excitation to connection points of four vibration absorbers of the model and the vehicle body by utilizing a transient dynamics calculation method, and calculating the relative displacement of the vehicle door and the vehicle body under the excitation condition.
The invention has the following beneficial effects: the invention discloses a method, a storage medium, equipment and a device for predicting and analyzing abnormal frictional sound of a vehicle door sealing strip. According to the invention, through a simulation analysis means, the vibration response of the door sealing strip in the installation state of the vehicle body is simulated, the relative displacement of the door sealing strip and the vehicle body is obtained, then a test testing means is combined, the friction characteristic of the sealing strip and the metal plate of the vehicle body is simulated, the friction abnormal sound risk of the sealing strip is judged through comparing the relative displacement obtained by calculation and the friction characteristic obtained by the test, the influence factors of various aspects such as the vehicle body structure, the friction characteristic of the sealing strip and the like on the friction abnormal sound of the sealing strip are considered by the system, and the prediction result is more effective. In addition, in the simulation calculation of the relative displacement of the door sealing strip and the vehicle body, the acceleration signal of the connecting point of the vehicle body and the chassis, which is acquired by the test, is utilized, the real displacement signal of the connecting point of the vehicle body is obtained by an integration method, and the displacement loading is carried out on the connecting point of the vehicle body shock absorber, so that the problem of poor simulation precision caused by the nonlinear characteristics of the tire and a suspension system in the process of directly exciting the tire to obtain the displacement of the door sealing strip can be effectively avoided, and in the stage of platform vehicle in the development process of an automobile product, namely the stage of sampling without a formal vehicle body structure, the effective abnormal sound risk evaluation of the friction characteristic of the door sealing strip can be realized.
Drawings
FIG. 1 is a flow chart of a method for predicting and analyzing abnormal frictional sound of a vehicle door sealing strip according to the present invention;
FIG. 2 is a graph of the peak frictional force;
FIG. 3 is a diagram of the excitation signal for the left front shock absorber body attachment point.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
the invention provides a method, a storage medium, equipment and a device for predicting and analyzing abnormal frictional sound of a vehicle door sealing strip, and aims to solve the problems in the prior art.
Referring to fig. 1, a method for predicting and analyzing the frictional abnormal sound of a door sealing strip includes the following steps:
s100, testing the friction characteristic of the vehicle door sealing strip to obtain the stick-slip displacement generated in the friction test process of the vehicle door sealing strip and the painted surface metal plate;
s200, carrying out excitation response analysis on a vehicle body system, and calculating the relative displacement of the vehicle door and the vehicle body under an excitation condition;
s300, carrying out the risk evaluation of the abnormal friction sound of the sealing strip of the vehicle door according to the relative displacement of the vehicle door and the vehicle body under the excitation condition and the stick-slip displacement generated in the friction test process of the sealing strip of the vehicle door and the painted surface metal plate.
Specifically, in this embodiment, a material friction test system is first used to test the friction characteristics of the sealing strip and the painted surface metal plate, identify basic condition parameters of the sealing strip for generating the abnormal friction sound, then calculate the relative position change of the vehicle door and the vehicle body under the actual excitation condition through a simulation analysis method, and finally identify the abnormal sound risk through the comparative analysis of the dynamic displacement of the vehicle door and the vehicle body and the basic condition parameters of the abnormal friction sound of the sealing strip.
The second embodiment is as follows:
further, in S100, the method specifically includes the following steps:
s110, acquiring information of compression amount, compression load and rigidity of the vehicle door sealing strip in a closed state of a vehicle door;
step S120, preparing a test piece: the tested piece comprises a vehicle door sealing strip and a painted metal plate test piece, wherein the vehicle door sealing strip is obtained by cutting the complete vehicle door sealing strip; the surface of the painted metal plate test piece needs to be processed to be the same as the paint of the whole vehicle;
step S130, clamping and friction characteristic testing of the tested piece are carried out: the door sealing strip and the painted surface metal plate test piece are respectively restrained and fixed on the material friction test system by a clamp, so that the matching of the contact area of the door sealing strip and the painted surface metal plate test piece is ensured, and the compression amount of the door sealing strip is the same as that in the closed state of the door; selecting N sliding speeds during testing, enabling the vehicle door sealing strip to slide relative to the painted metal plate along the direction perpendicular to the length direction of the vehicle door sealing strip, and testing and recording a friction force change curve changing along with time;
step S140, data analysis is carried out: counting the slippage displacement of the stick-slip in the friction test process of the vehicle door sealing strip and the painted surface metal plate test piece, wherein the slippage occurs once every time the friction force fluctuates according to a friction force change curve changing along with time, taking the average value of 10 slippage lengths, and taking the slippage displacement at N slippage speeds as the minimum value.
The third concrete embodiment:
further, in S120, specifically, the cut length of the door weather strip is 5cm, and the surface is required to be clean and not damaged; the size of the painted sheet metal test piece is 5cm x 3 cm. In this embodiment, in S130, 2 sliding speeds, 1mm/S and 3mm/S respectively, are selected during the test, and as shown in fig. 2, the slip displacement at which stick-slip friction occurs is 0.16mm under the condition of the speed of 1 m/S.
The fourth concrete embodiment:
further, in S200, the method specifically includes the following steps:
step S210, building a dynamic deformation calculation analysis model of the vehicle door and the vehicle body: the method comprises the following steps of establishing a simulation model of a vehicle door and a vehicle body by using software such as hypermesh, wherein the vehicle body model adopts a non-interior vehicle body to reduce the modeling workload, the vehicle door adopts a full-interior vehicle door to avoid dynamic parameter change caused by the interior quality of the vehicle door, and the positions of a restraint door lock and a hinge between the vehicle door and the vehicle body are simulated by using a hinge model; simulating the door sealing strip by using the elastic unit according to the information of the compression amount, the compression load and the rigidity of the door sealing strip in the closed state of the door in the step S110;
step S220, obtaining an excitation signal: collecting vibration acceleration signals at key connection points of vehicle bodies and suspensions of platform vehicles (formal chassis and informal vehicle body sample vehicles) or similar vehicle types, namely connection points of front and rear four vibration absorbers and the vehicle bodies, selecting bumpy road surfaces such as Belgium roads, cobblestone roads, twisted roads and the like according to abnormal sound generation conditions of vehicle door sealing strips under vibration signal collection working conditions, carrying out high-pass filtering and integration on the collected vibration acceleration signals for two times, and obtaining displacement signals of four points as model excitation signals;
and S230, applying forced displacement excitation to the connection points of the four vibration absorbers and the vehicle body of the model by using a transient dynamics calculation method, and calculating the relative tangential displacement of the vehicle door sealing strip and the vehicle body under the excitation condition.
The fifth concrete embodiment:
further, in S300, specifically: and comparing the calculated relative tangential displacement of the door sealing strip and the vehicle body under the excitation condition with the stick-slip displacement generated in the friction test process of the door sealing strip and the painted surface metal plate, and when the relative displacement of the door and the vehicle body under the excitation condition exceeds the slip displacement, indicating that the risk of friction abnormal sound exists between the door sealing strip and the vehicle body.
The sixth specific embodiment:
a storage medium having stored thereon a computer program which, when executed by a processor, implements the method described above.
The seventh specific embodiment:
an electronic device comprising a memory and a processor, the memory having stored thereon a computer program for execution on the processor, the processor implementing the method when executing the computer program.
The eighth embodiment:
a device for predicting and analyzing the frictional abnormal sound of a vehicle door sealing strip comprises a testing module for the frictional characteristic of the vehicle door sealing strip, an analysis module for the excitation response of a vehicle body system and a risk evaluation module for the frictional abnormal sound of the vehicle door sealing strip,
the vehicle door sealing strip friction characteristic testing module is used for acquiring the stick-slip sliding displacement generated in the friction testing process of the vehicle door sealing strip and the painted surface metal plate;
the vehicle body system excitation response analysis module is used for calculating the relative displacement of the vehicle door and the vehicle body under the excitation condition;
and the door sealing strip friction abnormal sound risk assessment module is used for carrying out door sealing strip friction abnormal sound risk assessment according to the relative displacement of the door and the vehicle body under the excitation condition and the slippage displacement of the door sealing strip and the paint surface metal plate in the friction test process.
The specific embodiment is nine:
further, the vehicle door sealing strip friction characteristic testing module comprises a vehicle door sealing strip state obtaining unit, a tested piece preparing unit, a tested piece clamping and friction characteristic testing unit and a data analyzing unit, wherein,
the vehicle door sealing strip state acquiring unit is used for acquiring the compression amount, the compression load and the rigidity information of the vehicle door sealing strip in a vehicle door closing state;
the tested piece preparation unit is used for intercepting the vehicle door sealing strip and processing the surface of the painted metal plate test piece to be the same as the painted surface of the whole vehicle;
the tested piece clamping and friction characteristic testing unit is used for respectively fixing the vehicle door sealing strip and the painted surface metal plate test piece on the material friction testing system in a restraining mode through a clamp, so that the vehicle door sealing strip and the painted surface metal plate slide relatively along the direction perpendicular to the length direction of the vehicle door sealing strip, and a friction force change curve changing along with time is tested and recorded;
the data analysis unit is used for counting the slipping displacement of the car door sealing strip and the painted surface metal plate test piece in the process of friction test, and according to a friction force change curve changing along with time, when slipping occurs once, the friction force fluctuates once at a peak value, the average value of 10 times of slipping length is taken, and the slipping displacement under N sliding speeds is taken as the minimum value.
The specific embodiment ten:
further, the vehicle body system excitation response analysis module comprises a vehicle door and vehicle body dynamic deformation calculation analysis model establishing unit, an excitation signal acquiring unit and a vehicle door and vehicle body relative displacement calculating unit, wherein,
the dynamic deformation calculation analysis model building unit of the vehicle door and the vehicle body is used for building a simulation model of the vehicle door and the vehicle body, wherein the positions of a restraint door lock and a hinge between the vehicle door and the vehicle body are simulated by utilizing a hinge model; simulating the door sealing strip by using an elastic unit according to the information of the compression amount, the compression load and the rigidity of the door sealing strip in the closed state of the door;
the excitation signal acquisition unit is used for acquiring vibration acceleration signals of key connection points of a vehicle body and a suspension of the same vehicle type, namely connection points of front and rear four vibration absorbers and the vehicle body, performing high-pass filtering and integration on the acquired vibration acceleration signals twice to obtain displacement signals of four points, and using the displacement signals as model excitation signals;
the vehicle door and vehicle body relative displacement calculation unit is used for applying forced displacement excitation to connection points of four vibration absorbers and a vehicle body of a model by using a transient dynamics calculation method and calculating the relative displacement of the vehicle door and the vehicle body under the excitation condition.
The protection key points of the invention are as follows:
1. the method for testing the friction characteristics of the sealing strip and the metal plate on the painted surface of the automobile body comprises the steps of clamping the sealing strip and the metal plate on the painted surface, and simulating the contact angle and the compression amount of the sealing strip and the metal plate in a real-vehicle state; and testing the friction characteristic test indexes of the sealing strip and the painted metal plate, testing a slip displacement curve when stick-slip occurs, and calculating the average slip displacement by adopting a statistical method.
2. The simulation calculation method of the relative displacement of the vehicle door and the vehicle body is characterized in that the influence of the compression pretightening force of the sealing strip on the vehicle door and the vehicle body model is simulated by adopting a mode of increasing the prestress by an elastic unit, and the rigidity of an elastic body is set according to the rigidity of the sealing strip in a compression state; the method comprises the steps of selecting an excitation signal, simulating the displacement of a key connecting point of a vehicle body and a chassis of the whole vehicle under a road excitation condition, collecting acceleration signals of four points of the same type of vehicle, and obtaining displacement signals of the four points in a mode of integration after two times of high-pass filtering.
3. The method for judging the risk of the frictional abnormal sound of the sealing strip of the vehicle door is characterized in that the relative displacement of the vehicle door and the vehicle body obtained through transient dynamics calculation is compared with the sliding displacement of the sealing strip obtained through a test method when the frictional abnormal sound of the sealing strip and a painted surface metal plate occurs, when the relative displacement of the vehicle door and the vehicle body exceeds the sliding displacement, the fact that the frictional abnormal sound risk exists between the sealing strip and the vehicle body under the current vehicle body structure is indicated, and if the relative displacement of the vehicle door and the vehicle body is smaller than the sliding displacement, the fact that the frictional abnormal sound risk does not exist between the sealing strip and the vehicle body under the current vehicle body structure is indicated.
Claims (10)
1. The method for predicting and analyzing the frictional abnormal sound of the sealing strip of the vehicle door is characterized by comprising the following steps of:
s100, testing the friction characteristic of the vehicle door sealing strip to obtain the stick-slip displacement generated in the friction test process of the vehicle door sealing strip and the painted surface metal plate;
s200, carrying out excitation response analysis on a vehicle body system, and calculating the relative displacement of the vehicle door and the vehicle body under an excitation condition;
s300, carrying out the risk evaluation of the abnormal friction sound of the sealing strip of the vehicle door according to the relative displacement of the vehicle door and the vehicle body under the excitation condition and the stick-slip displacement generated in the friction test process of the sealing strip of the vehicle door and the painted surface metal plate.
2. The method for predicting and analyzing the abnormal frictional sound of the vehicle door sealing strip according to claim 1, wherein in S100, the method specifically comprises the following steps:
s110, acquiring information of compression amount, compression load and rigidity of the vehicle door sealing strip in a closed state of a vehicle door;
step S120, preparing a test piece: the tested piece comprises a vehicle door sealing strip and a painted metal plate test piece, wherein the vehicle door sealing strip is obtained by cutting the complete vehicle door sealing strip; the surface of the painted metal plate test piece needs to be processed to be the same as the paint of the whole vehicle;
step S130, clamping and friction characteristic testing of the tested piece are carried out: the door sealing strip and the painted surface metal plate test piece are respectively restrained and fixed on the material friction test system by a clamp, so that the matching of the contact area of the door sealing strip and the painted surface metal plate test piece is ensured, and the compression amount of the door sealing strip is the same as that in the closed state of the door; selecting N sliding speeds during testing, enabling the vehicle door sealing strip to slide relative to the painted metal plate along the direction perpendicular to the length direction of the vehicle door sealing strip, and testing and recording a friction force change curve changing along with time;
step S140, data analysis is carried out: counting the slippage displacement of the stick-slip in the friction test process of the vehicle door sealing strip and the painted surface metal plate test piece, wherein the slippage occurs once every time the friction force fluctuates according to a friction force change curve changing along with time, taking the average value of 10 slippage lengths, and taking the slippage displacement at N slippage speeds as the minimum value.
3. The method for predicting and analyzing the abnormal frictional sound of the vehicle door sealing strip according to claim 2, wherein in S120, specifically, the cut length of the vehicle door sealing strip is 5cm, and the surface is required to be clean and free of damage; the size of the painted sheet metal test piece is 5cm x 3 cm.
4. The method for predicting and analyzing the abnormal frictional sound of the vehicle door sealing strip according to claim 3, wherein in S200, the method specifically comprises the following steps:
step S210, building a dynamic deformation calculation analysis model of the vehicle door and the vehicle body: establishing a simulation model of the vehicle door and the vehicle body, and simulating the positions of a restraint door lock and a hinge between the vehicle door and the vehicle body by using a hinge model; simulating the door sealing strip by using the elastic unit according to the information of the compression amount, the compression load and the rigidity of the door sealing strip in the closed state of the door in the step S110;
step S220, obtaining an excitation signal: collecting vibration acceleration signals of key connection points of a vehicle body and a suspension of the same vehicle type, namely connection points of front and rear four vibration absorbers and the vehicle body, carrying out high-pass filtering twice on the collected vibration acceleration signals and integrating to obtain displacement signals of four points, wherein the displacement signals are used as model excitation signals;
and step S230, applying forced displacement excitation to the connection points of the four vibration absorbers and the vehicle body of the model by using a transient dynamics calculation method, and calculating the relative displacement of the vehicle door and the vehicle body under the excitation condition.
5. The method for predicting and analyzing the abnormal frictional sound of the vehicle door sealing strip according to claim 4, wherein in S300, specifically: and comparing the calculated relative displacement of the vehicle door and the vehicle body under the excitation condition with the stick-slip displacement generated in the friction test process of the vehicle door sealing strip and the painted surface metal plate, and when the relative displacement of the vehicle door and the vehicle body under the excitation condition exceeds the slip displacement, indicating that the risk of friction abnormal sound exists between the vehicle door sealing strip and the vehicle body.
6. A storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the method of any one of claims 1 to 5.
7. An electronic device comprising a memory and a processor, the memory having stored thereon a computer program for execution on the processor, wherein the processor, when executing the computer program, implements the method of any of claims 1-5.
8. A device for predicting and analyzing the frictional abnormal sound of a sealing strip of a vehicle door, which is based on the method for predicting and analyzing the frictional abnormal sound of the sealing strip of the vehicle door according to any one of claims 1 to 5, is characterized by comprising a testing module for the frictional characteristic of the sealing strip of the vehicle door, an analysis module for the excitation response of a vehicle body system and a risk evaluation module for the frictional abnormal sound of the sealing strip of the vehicle door,
the vehicle door sealing strip friction characteristic testing module is used for acquiring the stick-slip sliding displacement generated in the friction testing process of the vehicle door sealing strip and the painted surface metal plate;
the vehicle body system excitation response analysis module is used for calculating the relative displacement of the vehicle door and the vehicle body under the excitation condition;
and the door sealing strip friction abnormal sound risk assessment module is used for carrying out door sealing strip friction abnormal sound risk assessment according to the relative displacement of the door and the vehicle body under the excitation condition and the slippage displacement of the door sealing strip and the paint surface metal plate in the friction test process.
9. The device for predicting and analyzing the abnormal frictional sound of the door weather strip according to claim 8, wherein the door weather strip frictional characteristic testing module comprises a door weather strip state obtaining unit, a tested piece preparing unit, a tested piece clamping and frictional characteristic testing unit and a data analyzing unit,
the vehicle door sealing strip state acquisition unit is used for acquiring the compression amount, the compression load and the rigidity information of the vehicle door sealing strip in a vehicle door closing state;
the tested piece preparation unit is used for intercepting the vehicle door sealing strip and processing the surface of the painted metal plate test piece to be the same as the painted surface of the whole vehicle;
the tested piece clamping and friction characteristic testing unit is used for respectively fixing the vehicle door sealing strip and the painted surface metal plate test piece on the material friction testing system in a restraining mode through a clamp, so that the vehicle door sealing strip and the painted surface metal plate can slide relative to each other along the direction perpendicular to the length direction of the vehicle door sealing strip, and a friction force change curve changing along with time is tested and recorded;
the data analysis unit is used for counting the slipping displacement of the car door sealing strip and the painted surface metal plate test piece in the process of friction test, and according to a friction force change curve changing along with time, when slipping occurs once, the friction force fluctuates once at a peak value, the average value of 10 times of slipping length is taken, and the slipping displacement under N sliding speeds is taken as the minimum value.
10. The device for predicting and analyzing the abnormal frictional sound of the sealing strip of the vehicle door according to claim 9, wherein the vehicle body system excitation response analysis module comprises a vehicle door and vehicle body dynamic deformation calculation analysis model establishing unit, an excitation signal acquiring unit and a vehicle door and vehicle body relative displacement calculating unit,
the vehicle door and vehicle body dynamic deformation calculation analysis model establishing unit is used for establishing a simulation model of the vehicle door and the vehicle body, wherein the positions of a constraint door lock and a hinge between the vehicle door and the vehicle body are simulated by using a hinge model; simulating the door sealing strip by using an elastic unit according to the information of the compression amount, the compression load and the rigidity of the door sealing strip in the closed state of the door;
the excitation signal acquisition unit is used for acquiring vibration acceleration signals of key connection points of a vehicle body and a suspension of the same vehicle type, namely connection points of front and rear four vibration absorbers and the vehicle body, performing high-pass filtering and integration on the acquired vibration acceleration signals twice to obtain displacement signals of four points, and using the displacement signals as model excitation signals;
the vehicle door and vehicle body relative displacement calculation unit is used for applying forced displacement excitation to connection points of four vibration absorbers and a vehicle body of a model by using a transient dynamics calculation method and calculating the relative displacement of the vehicle door and the vehicle body under the excitation condition.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210246999.2A CN114818411A (en) | 2022-03-14 | 2022-03-14 | Method, storage medium, equipment and device for predicting and analyzing friction abnormal sound of vehicle door sealing strip |
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| CN202210246999.2A CN114818411A (en) | 2022-03-14 | 2022-03-14 | Method, storage medium, equipment and device for predicting and analyzing friction abnormal sound of vehicle door sealing strip |
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| CN202210246999.2A Pending CN114818411A (en) | 2022-03-14 | 2022-03-14 | Method, storage medium, equipment and device for predicting and analyzing friction abnormal sound of vehicle door sealing strip |
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