Automobile brake system wire harness support strength analysis method and device

Abstract

The application discloses a kind of automobile brake system wire harness support strength analysis method and device.The automobile brake system wire harness support strength analysis method includes: obtaining brake system wire harness support basic information;According to brake system wire harness support basic information, establish brake wire harness support static strength analysis finite element model and brake wire harness support fatigue strength finite element analysis model;According to brake wire harness support static strength analysis finite element model, obtain stress distribution information;Obtain frequency domain load spectrum data;According to brake wire harness support fatigue strength finite element analysis model, obtain stress response spectrum;According to stress distribution information, analyze the static strength of automobile brake system wire harness support;According to frequency domain load spectrum data and stress response spectrum, analyze the fatigue strength of automobile brake system wire harness support.The application analyzes the effect of wire harness on support in detail;Make the analysis of brake wire harness support more comprehensive, meticulous, quantifiable, effectively shorten the verification period, and efficiency is significantly improved.

Description

Technical Field

[0001] This application relates to the field of automotive braking system technology, specifically to a method and device for strength analysis of automotive braking system wiring harness brackets. Background Technology

[0002] The braking system wiring harness is connected to sensors, transmitting electronic signals such as vehicle status information collected by the sensors. The upper part of the wiring harness bracket supports the wiring harness, ensuring it functions properly in its preset position, while the lower part of the bracket is fixed to the steering knuckle. During driving, the thin-structured bracket will vibrate at a certain amplitude and frequency; in extreme cases, large vibrations can damage the bracket and cause the braking wiring harness to detach. This can lead to the sensors at the end of the wiring harness misreading signals or malfunctioning, thus endangering driving safety.

[0003] The braking system wiring harness bracket is subjected to excitation from the road surface. Simultaneously, since the beginning and end of the wiring harness are connected to the vehicle body and chassis system respectively, the wiring harness exerts a certain degree of tension and compression on the bracket when the two systems move relative to each other. Furthermore, to ensure the reliability of signal transmission and protect it from environmental interference and damage, the braking system wiring harness typically possesses a certain degree of strength and toughness.

[0004] ①. When the vehicle accelerates at a high speed, the pulling and compressing effects of the wiring harness on the bracket cannot be ignored;

[0005] ②. When the wheel vibrates due to random loads on the road surface, the effect of the wiring harness on the support is also significant.

[0006] In summary, during vehicle operation, the wiring harness can affect the strength and performance of the bracket.

[0007] Currently, the strength of automotive brake brackets is mainly assessed through testing, which requires significant manpower and resources, takes a long time, and suffers from insufficient analysis and unclear data regarding the impact of wiring harnesses on bracket strength.

[0008] Therefore, there is a need for a technical solution to address or at least mitigate the aforementioned shortcomings of existing technologies. Summary of the Invention

[0009] The purpose of this invention is to provide a method for strength analysis of automotive braking system wiring harness brackets to at least solve one of the above-mentioned technical problems.

[0010] One aspect of the present invention provides a method for strength analysis of a wiring harness bracket in an automotive braking system. The braking system includes a wiring harness bracket, a brake wiring harness, a wiring harness connector, and a sensor. The method for strength analysis of the wiring harness bracket in the automotive braking system includes:

[0011] Obtain basic information about the braking system wiring harness bracket;

[0012] Based on the basic information of the braking system wiring harness bracket, establish a static strength analysis finite element model and a fatigue strength analysis finite element model of the braking wiring harness bracket respectively.

[0013] The stress distribution information of the brake harness bracket under static load is obtained based on the static strength analysis finite element model of the brake harness bracket.

[0014] Acquire frequency domain load spectrum data;

[0015] The stress response spectrum was obtained based on the finite element analysis model of the fatigue strength of the brake harness bracket.

[0016] The static strength of the automotive braking system wiring harness bracket is analyzed based on the stress distribution information.

[0017] The fatigue strength of the automotive braking system wiring harness bracket is analyzed based on the frequency domain load spectrum data and stress response spectrum.

[0018] Optionally, obtaining the basic information of the braking system wiring harness bracket includes:

[0019] Obtain static strength and fatigue strength conditions;

[0020] Obtain the maximum acceleration load information of the braking system wiring harness bracket under static strength conditions;

[0021] Obtain load spectrum data for fatigue strength conditions;

[0022] Obtain the stiffness information of each segment of the braking system wiring harness after it has been segmented;

[0023] Obtain the position of the connection point between the braking system wiring harness and the vehicle body relative to the wheel center point when the vehicle is statically fully loaded;

[0024] Under various static strength conditions, obtain the extreme positions of the connection points between the braking system wiring harness and the vehicle body relative to the wheel center point;

[0025] Obtain the displacement vector of the extreme position of the connection point between the braking system wiring harness and the vehicle body relative to the wheel center point under various static strength conditions, relative to the position of the connection point between the braking system wiring harness and the vehicle body relative to the wheel center point under static full load of the vehicle.

[0026] Optionally, establishing a finite element model for static strength analysis of the brake harness bracket based on the basic information of the brake system harness bracket includes:

[0027] A finite element model of the brake harness bracket is established using two-dimensional shell elements or three-dimensional solid elements, and material properties are assigned to it.

[0028] The brake harness is divided into segments, and mass point units are established for each segment of the harness.

[0029] The mass of the wire harness connector and the sensor is characterized by a mass point unit established at the location of their centroid.

[0030] Obtain the location of the connection point between the brake harness and the vehicle body;

[0031] The brake harness bracket and the ends of each harness are constrained.

[0032] Optionally, the static strength conditions include the upward jump limit condition, emergency acceleration condition, braking condition, and extreme cornering condition;

[0033] The fatigue strength conditions include random vibration fatigue conditions;

[0034] The acquisition of the maximum acceleration load information of the braking system wiring harness bracket under static strength conditions includes:

[0035] Under the extreme condition of upward jump, obtain the maximum acceleration load of the braking harness support system under the extreme condition of upward jump;

[0036] Obtain the maximum acceleration load on the brake harness support system under emergency acceleration or braking conditions.

[0037] Obtain the maximum acceleration load of the brake harness support system under extreme turning conditions.

[0038] Optionally, obtaining the extreme positions of the connection point between the wiring harness and the vehicle body relative to the wheel center point under various static strength conditions includes:

[0039] Under the aforementioned extreme upward jump condition, with the wheel center as the reference point, the extreme position of the connection point between the wiring harness and the vehicle body relative to the wheel center is determined, and the extreme upward jump displacement vector of this position relative to the position of the connection point between the braking system wiring harness and the vehicle body relative to the wheel center is obtained.

[0040] Under the emergency acceleration or braking conditions, with the wheel center as the reference point, the extreme position of the connection point between the wiring harness and the vehicle body relative to the wheel center is determined, and the displacement vector of this position relative to the position of the connection point between the braking system wiring harness and the vehicle body relative to the wheel center is obtained under the emergency acceleration or braking conditions.

[0041] Under the extreme turning condition, with the wheel center as the reference point, the extreme position of the connection point between the wiring harness and the vehicle body relative to the wheel center is determined, and the extreme turning displacement vector of this position relative to the position of the connection point between the braking system wiring harness and the vehicle body relative to the wheel center is obtained.

[0042] Optionally, obtaining the stress distribution information of the brake harness bracket under static load conditions based on the static strength analysis finite element model of the brake harness bracket includes:

[0043] Under the aforementioned extreme condition of upward jump, the maximum acceleration load of the upper limit is applied to the static strength analysis finite element model of the brake harness bracket, and a displacement load is applied at the connection point between the brake harness and the vehicle body according to the aforementioned displacement vector of the upper limit, and the stress distribution of the brake harness bracket under the upper limit condition of upward jump is calculated.

[0044] Under the emergency acceleration or braking conditions, the maximum acceleration load under the emergency acceleration or braking conditions is applied to the finite element model of the brake harness bracket static strength analysis, and the displacement load is applied at the connection point between the harness and the vehicle body according to the displacement vector under the emergency acceleration or braking conditions. The stress distribution of the brake harness bracket under the emergency acceleration or braking conditions is calculated.

[0045] Under the extreme cornering condition, the maximum acceleration load of the extreme cornering is applied to the static strength analysis finite element model of the brake harness bracket, and the displacement load is applied at the connection point between the harness and the vehicle body according to the extreme cornering displacement vector, and the stress distribution of the brake harness bracket under the extreme cornering condition is calculated.

[0046] Optionally, establishing a finite element analysis model for the fatigue strength of the brake harness bracket based on the basic information of the brake system harness bracket includes:

[0047] Obtain the finite element model for static strength analysis of the brake harness bracket;

[0048] The connection point between the brake harness and the vehicle body in the static strength analysis finite element model of the brake harness bracket is used as the basic motion input end to form a finite element model for fatigue strength analysis of the brake system bracket.

[0049] Optionally, obtaining the stress response spectrum based on the finite element analysis model of the brake harness bracket fatigue strength includes:

[0050] Frequency response analysis was performed on the finite element model of the brake system bracket for fatigue strength analysis to obtain the stress response spectrum of the structure.

[0051] Optionally, the step of analyzing the static strength of the automotive braking system wiring harness bracket based on the stress distribution information includes:

[0052] Obtain the stress distribution under extreme conditions of upward jump, stress distribution under emergency acceleration or braking, and stress distribution under extreme cornering conditions;

[0053] Obtain the mechanical properties of the brake harness bracket material;

[0054] The stress distribution under extreme conditions of upward jump, emergency acceleration or braking, and extreme cornering is compared with the mechanical properties of the brake harness bracket material, and the bracket is judged to meet the static strength requirements based on the comparison results.

[0055] The fatigue strength analysis of the automotive braking system wiring harness bracket based on the frequency domain load spectrum data and stress response spectrum includes:

[0056] The damage value of the harness bracket is obtained based on the frequency domain load spectrum data, the stress response spectrum, and the mechanical properties of the brake harness bracket material.

[0057] Determine whether the damage value of the wire harness bracket is less than the damage threshold. If it is, the bracket fatigue strength is determined to meet the requirements; if the damage value is greater than the threshold, the bracket fatigue strength is determined to not meet the requirements.

[0058] This application also provides a strength analysis device for automotive braking system wiring harness brackets, the automotive braking system wiring harness bracket strength analysis device comprising:

[0059] A braking system wiring harness bracket basic information acquisition module, wherein the braking system wiring harness bracket basic information acquisition module is used to acquire basic information of the braking system wiring harness bracket;

[0060] The finite element model establishment module is used to establish a static strength analysis finite element model and a fatigue strength finite element analysis model of the brake harness bracket based on the basic information of the brake system harness bracket.

[0061] A frequency domain load spectrum data acquisition module, wherein the frequency domain load spectrum data acquisition module is used to acquire frequency domain load spectrum data;

[0062] A stress response spectrum acquisition module is used to acquire the stress response spectrum based on the finite element analysis model of the fatigue strength of the brake harness bracket.

[0063] A static strength analysis module is used to analyze the static strength of the automotive braking system wiring harness bracket based on the stress distribution information.

[0064] The fatigue strength analysis module is used to analyze the fatigue strength of the automotive braking system wiring harness bracket based on the frequency domain load spectrum data and stress response spectrum.

[0065] Beneficial effects

[0066] The strength analysis method for automotive braking system wiring harness brackets in this application, in addition to acceleration loads and random vibration excitations, also analyzes in detail the effect of the wiring harness on the bracket. This makes the analysis of braking wiring harness brackets more comprehensive, detailed, and quantifiable, effectively shortening the verification cycle and significantly improving efficiency. Furthermore, based on the analysis of a certain number of samples, a database can be established for accumulation, which is of positive significance for subsequent structural design, analysis, and experimental verification. Attached Figure Description

[0067] Figure 1 This is a flowchart illustrating a method for strength analysis of a wiring harness bracket in an automotive braking system according to an embodiment of this application.

[0068] Figure 2 This is a schematic diagram of a strength analysis device for a car braking system wiring harness bracket according to an embodiment of this application.

[0069] Figure 3 This is a schematic diagram of the automotive braking system of this application.

[0070] Figure 4 This is a structural schematic diagram of the finite element model for static strength analysis of the brake harness bracket in this application.

[0071] Figure 5 This is a schematic diagram of the finite element analysis model of the fatigue strength of the brake harness bracket in this application. Attached image description:

[0073] 1. Brake harness bracket; 2. Brake harness; 3. Harness connector; 4. Dust baffle; 5. Wheel hub bearing; 6. Brake disc; 7. EPB sensor; 8. Wheel speed sensor; 9. Steering knuckle; 10. Body support; 11. Spring unit; 12. Mass point unit. Detailed Implementation

[0074] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are some, but not all, embodiments of this application. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application. The embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0075] Figure 1 This is a flowchart illustrating a method for strength analysis of a wiring harness bracket in an automotive braking system according to an embodiment of this application.

[0076] See Figure 3 The braking system of this application includes a brake harness bracket 1, a brake harness 2, a harness connector 3, a dust baffle 4, a wheel hub bearing 5, a brake disc 6, an EPB sensor 7, a wheel speed sensor 8, a steering knuckle 9, and a body support 10.

[0077] like Figure 1 The strength analysis method for automotive braking system wiring harness brackets shown includes:

[0078] Step 1: Obtain basic information about the braking system wiring harness bracket;

[0079] Step 2: Based on the basic information of the braking system wiring harness bracket, establish the static strength analysis finite element model and the fatigue strength analysis model of the braking wiring harness bracket respectively.

[0080] Step 3: Obtain the stress distribution information of the brake harness bracket under static load conditions based on the finite element model of the brake harness bracket for static strength analysis.

[0081] Step 4: Obtain frequency domain load spectrum data;

[0082] Step 5: Obtain the stress response spectrum based on the finite element analysis model of the fatigue strength of the brake harness bracket;

[0083] Step 6: Analyze the static strength of the automotive braking system wiring harness bracket based on the stress distribution information;

[0084] Step 7: Analyze the fatigue strength of the automotive braking system wiring harness bracket based on the frequency domain load spectrum data and stress response spectrum.

[0085] The strength analysis method for automotive braking system wiring harness brackets in this application, in addition to acceleration loads and random vibration excitations, also analyzes in detail the effect of the wiring harness on the bracket. This makes the analysis of braking wiring harness brackets more comprehensive, detailed, and quantifiable, effectively shortening the verification cycle and significantly improving efficiency. Furthermore, based on the analysis of a certain number of samples, a database can be established for accumulation, which is of positive significance for subsequent structural design, analysis, and experimental verification.

[0086] In this embodiment, obtaining basic information about the braking system wiring harness bracket includes:

[0087] Obtain static strength and fatigue strength conditions;

[0088] Obtain the maximum acceleration load information of the braking system wiring harness bracket under static strength conditions;

[0089] Obtain load data for fatigue strength conditions;

[0090] Obtain the stiffness information of each segment of the braking system wiring harness after it has been segmented;

[0091] Obtain the position of the connection point between the braking system wiring harness and the vehicle body relative to the wheel center point when the vehicle is statically fully loaded;

[0092] Obtain the extreme positions of the connection point between the wiring harness and the vehicle body relative to the wheel center point under various static strength conditions;

[0093] Obtain the displacement vector of the extreme position of the connection point between the wiring harness and the vehicle body relative to the wheel center point, and the position of the connection point between the braking system wiring harness and the vehicle body relative to the wheel center point.

[0094] In this embodiment, establishing a finite element model for static strength analysis of the brake harness bracket based on the basic information of the brake system harness bracket includes:

[0095] A finite element model of the brake harness bracket is established using two-dimensional shell elements or three-dimensional solid elements, and material properties are assigned to it.

[0096] Establish mass point units for each segment of the brake harness after segmentation.

[0097] The mass of the wire harness connector and the sensor is characterized by a mass point unit established at the location of their centroid.

[0098] Connect the brake harness to the vehicle body at the designated connection points;

[0099] The brake harness bracket and the ends of each harness are constrained.

[0100] In this embodiment, the static strength conditions include the upward jump limit condition, emergency acceleration condition, braking condition, and extreme cornering condition;

[0101] Fatigue strength conditions include random vibration fatigue conditions;

[0102] Obtaining the maximum acceleration load information of the braking system wiring harness bracket under static strength conditions includes:

[0103] Under the extreme condition of upward jump, obtain the maximum acceleration load of the braking harness support system under the extreme condition of upward jump;

[0104] Obtain the maximum acceleration load on the brake harness support system under emergency acceleration or braking conditions.

[0105] Obtain the maximum acceleration load of the brake harness support system under extreme turning conditions.

[0106] In this embodiment, obtaining the extreme positions of the wiring harness connection point with respect to the wheel center point under various static strength conditions includes:

[0107] Under the extreme condition of upward jump, with the wheel center as the reference point, the extreme position of the connection point between the harness and the vehicle body relative to the wheel center point is determined, and the extreme displacement vector of the upward jump relative to the position of the connection point between the braking system harness and the vehicle body relative to the wheel center point is obtained.

[0108] Under emergency acceleration or braking conditions, with the wheel center as the reference point, determine the extreme position of the connection point between the wiring harness and the vehicle body relative to the wheel center point, and obtain the displacement vector of this position relative to the position of the connection point between the braking system wiring harness and the vehicle body relative to the wheel center point under emergency acceleration or braking conditions.

[0109] Under extreme cornering conditions, with the wheel center as a reference point, the extreme position of the connection point between the wiring harness and the vehicle body relative to the wheel center is determined, and the extreme cornering displacement vector of this position relative to the position of the connection point between the braking system wiring harness and the vehicle body relative to the wheel center is obtained.

[0110] In this embodiment, obtaining the stress distribution information of the brake harness bracket under static load conditions based on the finite element model of the brake harness bracket's static strength analysis includes:

[0111] Under the extreme condition of the upper jump, the maximum acceleration load of the upper jump limit is applied to the finite element model of the brake harness bracket for static strength analysis, and the displacement load is applied at the connection point between the brake harness and the vehicle body according to the upper jump limit displacement vector, and the stress distribution of the brake harness bracket under the upper jump limit condition is calculated.

[0112] Under emergency acceleration or braking conditions, the maximum acceleration load under emergency acceleration or braking conditions is applied to the finite element model of the brake harness bracket for static strength analysis. Displacement loads are applied at the connection point between the harness and the vehicle body according to the displacement vector under emergency acceleration or braking conditions. The stress distribution of the brake harness bracket under emergency acceleration or braking conditions is calculated.

[0113] Under extreme cornering conditions, the maximum acceleration load of extreme cornering is applied to the static strength analysis finite element model of the brake harness bracket, and displacement load is applied at the connection point between the harness and the vehicle body according to the extreme cornering displacement vector. The stress distribution of the brake harness bracket under extreme cornering conditions is then calculated.

[0114] In this embodiment, establishing a finite element analysis model for the fatigue strength of the brake harness bracket based on the basic information of the brake system harness bracket includes:

[0115] Obtain the finite element model for static strength analysis of the brake harness bracket;

[0116] The connection point between the brake harness and the vehicle body in the static strength analysis finite element model of the brake harness bracket is used as the basic motion input end to form a finite element model for fatigue strength analysis of the brake system bracket.

[0117] In this embodiment, obtaining the stress response spectrum based on the finite element analysis model of the brake harness bracket fatigue strength includes:

[0118] Frequency response analysis was performed on the finite element model of the brake system bracket for fatigue strength analysis to obtain the stress response spectrum of the structure.

[0119] In this embodiment, the frequency domain load spectrum data is obtained in the following manner:

[0120] The time-domain load spectrum obtained from road tests conducted during previous vehicle design and development.

[0121] Converting the time-domain load spectrum into the frequency-domain load spectrum is an existing technology and will not be elaborated here.

[0122] In this embodiment, analyzing the static strength of the automotive braking system wiring harness bracket based on the stress distribution information includes:

[0123] Obtain the stress distribution under extreme conditions of upward jump, stress distribution under emergency acceleration or braking, and stress distribution under extreme cornering conditions;

[0124] Obtain the mechanical properties of the brake harness bracket material;

[0125] The stress distributions under the extreme conditions of upward jump, emergency acceleration or braking, and extreme cornering are compared with the mechanical properties of the brake harness bracket material, and the results are used to determine whether the bracket meets the static strength requirements. Specifically, the maximum stress value under the extreme conditions of upward jump, emergency acceleration or braking, and extreme cornering are compared with the mechanical properties of the brake harness bracket material.

[0126] Specifically, the stress under each working condition (such as upward jump, emergency acceleration or braking, and turning) is compared with the yield strength data of the support material. If the maximum stress under each working condition is less than the yield strength, the static strength of the support meets the requirements; if the maximum stress under any working condition is greater than the yield strength, the static strength of the support does not meet the requirements.

[0127] The fatigue strength of the automotive braking system wiring harness bracket was analyzed based on frequency domain load spectrum data and stress response spectrum, including:

[0128] The damage value of the brake harness bracket is obtained based on the frequency domain load spectrum data, stress response spectrum, and mechanical properties of the brake harness bracket material.

[0129] Determine whether the damage value of the wire harness bracket is less than the damage threshold. If it is, the bracket's fatigue strength is deemed to meet the requirements. If the damage value is greater than the threshold, the bracket's fatigue strength is deemed not to meet the requirements.

[0130] The frequency domain load spectrum data, stress response spectrum, and mechanical properties of the support material are input into the fatigue analysis software to obtain the damage value distribution of the wire harness support. If the damage value is less than the threshold, the fatigue strength of the support is determined to meet the requirements; otherwise, if the damage value is greater than the threshold, the fatigue strength of the support is determined to not meet the requirements.

[0131] Specifically, it involves comparing the maximum damage value in the damage value distribution of the wire harness support with a threshold.

[0132] Specifically, after obtaining the damage value distribution of the structure, the fatigue strength of the stent is judged to meet the requirements by determining whether the maximum damage value in this damage value distribution is greater than 1 (sometimes it is not necessarily 1, and it will be adjusted according to experience).

[0133] If the damage value is less than 1, the fatigue strength of the stent meets the requirements;

[0134] If the damage value is greater than 1, the fatigue strength of the stent does not meet the requirements.

[0135] The strength analysis method for automotive braking system wiring harness brackets in this application can predict the static and fatigue strength of the brackets. In addition to acceleration loads and random vibration excitations, the analysis also details the effect of the wiring harness on the bracket. The wiring harness section employs a mass point and spring model, incorporating macroscopic wiring harness mass and measured stiffness information, objectively and accurately reflecting the influence of the wiring harness on the strength of the braking system bracket, making the analysis more comprehensive, detailed, and quantifiable.

[0136] The following examples further illustrate this application in detail. It is understood that these examples do not constitute any limitation on this application.

[0137] In this embodiment, the basic information of the braking system wiring harness bracket is first obtained. Specifically, the following information is obtained:

[0138] Based on actual user experience and testing, the analysis conditions were determined.

[0139] (1) Define the static strength conditions of the brake harness bracket, including: the upward jump limit condition, the emergency acceleration / braking condition, and the extreme turning condition.

[0140] (2) Define the fatigue strength condition of the brake harness bracket, namely: random vibration fatigue condition.

[0141] Based on the vehicle load, axle load transfer, and previous load data, the maximum acceleration load on the brake harness bracket system under static strength conditions was determined.

[0142] (1) Determine the maximum acceleration load on the wiring harness bracket of the vehicle braking system under the extreme condition of upward jump.

[0143] (2) Determine the maximum acceleration load on the wiring harness bracket of the vehicle braking system under emergency acceleration / braking conditions.

[0144] (3) Determine the maximum acceleration load on the wiring harness bracket of the vehicle braking system under extreme turning conditions.

[0145] In this embodiment, the previously acquired time-domain load spectrum is converted into a frequency-domain load spectrum, which serves as the load data for fatigue strength conditions.

[0146] In this embodiment, the braking system wiring harness sample is divided into segments, with the wiring harness connector, sensor, and the fixed position of the wiring harness on the bracket as the boundaries. The stiffness values ​​(including axial stiffness, bending stiffness, torsional stiffness, etc.) of each segment of the wiring harness are measured experimentally.

[0147] In this embodiment, the connection point between the wiring harness and the vehicle body is determined using the wheel center as a reference point when the vehicle is statically fully loaded. Figure 3 Point a) relative to the center point ( Figure 3 The location of point b).

[0148] In this embodiment, the connection point between the wiring harness and the vehicle body is determined under various static strength conditions, using the wheel center as a reference point. Figure 3 Point a) relative to the center point ( Figure 3 The extreme position of point b) is determined, and the displacement vector of the extreme position of the connection point between the braking system harness and the vehicle body relative to the wheel center point under various static strength conditions is obtained relative to the position of the connection point between the braking system harness and the vehicle body relative to the wheel center point under static full load conditions. Specifically:

[0149] (1) Under extreme upward jumping conditions, the connection point between the wiring harness and the vehicle body is determined with the wheel center as the reference point. Figure 3 Point a) relative to the center point ( Figure 3 Find the extreme position of b), and obtain the displacement vector of this position relative to the position of the connection point between the braking system harness and the vehicle body relative to the wheel center point under static full load of the vehicle.

[0150] (2) Under emergency acceleration / braking conditions, the connection point between the wiring harness and the vehicle body is determined with the wheel center as a reference point. Figure 3 Point a) relative to the center point ( Figure 3 Find the extreme position of point b) and obtain the displacement vector of this position relative to the position of the connection point between the braking system harness and the vehicle body relative to the wheel center point under static full load of the vehicle.

[0151] (3) Under extreme turning conditions, the connection point between the wiring harness and the vehicle body is determined with the wheel center as the reference point. Figure 3 Point a) relative to the center point ( Figure 3Find the extreme position of point b) and obtain the displacement vector of this position relative to the position of the connection point between the braking system harness and the vehicle body relative to the wheel center point under static full load of the vehicle.

[0152] See Figure 4 In this embodiment, a finite element model for static strength analysis of the brake harness bracket is established, which includes structures such as the brake harness bracket, brake harness, harness connector, and sensor.

[0153] (1) For brake harness bracket: establish a finite element model using two-dimensional shell elements or three-dimensional solid elements, and assign material properties.

[0154] (2) For the brake harness: The brake harness is segmented according to the segmentation rules used in obtaining the stiffness information of each segment of the brake system harness after segmentation. For each segment, a mass point unit 12 is established at the midpoint of the line connecting two adjacent dividing points to represent the mass of this segment; spring units 11 are established sequentially by connecting the midpoint of each segment with the adjacent dividing points, and the stiffness parameter of the spring unit is taken as the measured stiffness value of the segment.

[0155] (3) For wire harness connectors and sensors: The mass of wire harness connectors and sensors is characterized by mass point units established at the location of their centroids.

[0156] (4) Connection point between wiring harness and vehicle body Figure 3 The location of point a) is determined by using the wheel center as a reference point, when the vehicle is statically fully loaded, to determine the connection point between the wiring harness and the vehicle body. Figure 3 Point a) relative to the center point ( Figure 3 Establish the location of point b in the middle.

[0157] In this embodiment, under various static strength conditions, the fixed position of the constraint bracket and the ends of each wire harness are used as fixed ends, see... Figure 4 Points d (fixed end, displacement constraint), e (fixed end, displacement constraint), and f (fixed end of the support) are located at... Figure 4 as well as Figure 5 In the diagram, black dots represent mass point elements.

[0158] In this embodiment, under various static strength conditions, the acceleration load and displacement load applied to the finite element model of the brake harness bracket for static strength analysis are... Figure 4 (Point g) is selected, and the stress distribution of the brake harness bracket is calculated. Specifically:

[0159] Under the extreme condition of the upper jump, the maximum acceleration load of the upper jump limit is applied to the static strength analysis finite element model of the brake harness bracket, and the displacement load is applied at the connection point between the brake harness and the vehicle body according to the upper jump limit displacement vector, and the stress distribution of the brake harness bracket under the extreme condition of the upper jump is calculated.

[0160] Under emergency acceleration or braking conditions, the maximum acceleration load under emergency acceleration or braking conditions is applied to the finite element model of the brake harness bracket for static strength analysis. Displacement loads are applied at the connection point between the harness and the vehicle body according to the displacement vector under emergency acceleration or braking conditions. The stress distribution of the brake harness bracket under emergency acceleration or braking conditions is calculated.

[0161] Under extreme cornering conditions, the maximum acceleration load of extreme cornering is applied to the static strength analysis finite element model of the brake harness bracket, and displacement load is applied at the connection point between the harness and the vehicle body according to the extreme cornering displacement vector. The stress distribution of the brake harness bracket under extreme cornering conditions is then calculated.

[0162] In this embodiment, the stress distribution under extreme conditions of upward jump, emergency acceleration or braking, and extreme cornering is compared with the mechanical properties of the brake harness bracket material, and the bracket's static strength requirement is determined based on the comparison results. Specifically, it is determined whether each stress distribution exceeds the stress threshold in the mechanical properties of the brake harness bracket material. If it is less than the threshold, the bracket is determined to meet the static strength requirement; conversely, if the maximum stress on the brake harness bracket is greater than the threshold, the bracket is determined not to meet the static strength requirement.

[0163] In this embodiment, based on the static strength analysis finite element model of the brake harness bracket, and constraining the connection point between the harness and the vehicle body as the basic motion input end, a finite element model for fatigue strength analysis of the brake system bracket is formed. (See...) Figure 5 Points d (fixed end, displacement constraint), e (fixed end, displacement constraint), f (bracket fixed end), and h (basic motion input end, connection point between wiring harness and vehicle body).

[0164] For example, the mechanical properties of brake harness bracket material refer to the mechanical properties of the material used to manufacture the brake harness bracket. For instance, if the material used to manufacture the brake harness bracket is steel St13, then the obtained mechanical properties are the material properties of steel St13.

[0165] In this embodiment, frequency response analysis is performed on the finite element analysis model of the fatigue strength of the brake harness bracket to obtain the stress response spectrum of the structure.

[0166] In this embodiment, the obtained frequency domain load spectrum data, stress response spectrum, and mechanical properties of the support material are input into fatigue analysis software to obtain the damage value distribution of the wire harness support. If the damage value is less than a threshold, the fatigue strength of the support is determined to meet the requirements; otherwise, if the damage value is greater than the threshold, the fatigue strength of the support is determined to not meet the requirements.

[0167] The strength analysis method for automotive braking system wiring harness brackets proposed in this application, in addition to acceleration load and random vibration excitation, also analyzes in detail and objectively the effect of the wiring harness on the bracket.

[0168] The method for strength analysis of automotive braking system wiring harness brackets, measurement of the stiffness of the braking wiring harness, and establishment of the finite element model of the wiring harness in this application all require segmenting the wiring harness according to the following rules: that is, the braking system wiring harness is segmented with the wiring harness connector, sensor, and the fixed position of the wiring harness in the bracket as the boundary.

[0169] In this approach, the wire harness connectors and sensors are modeled as separate mass point elements. After removing the connectors and sensors, only the individual wire harness segments remain. These segments are modeled using mass point elements combined with spring elements.

[0170] The advantage of this modeling method is that it avoids mixing the mass information of mass points such as wire harness connectors and sensors into the wire harness segments, making the actual collection of mass information and stiffness of each wire harness segment very clear and concise.

[0171] The strength analysis method for automotive braking system wiring harness brackets in this application uses a combination of mass point elements and spring elements in the finite element model of the braking wiring harness, and characterizes the wiring harness by mass and stiffness information obtained through actual measurement.

[0172] This application uses a combination of mass point elements and spring elements to build the finite element model of the wire harness section. The mass of each segment of the wire harness is represented by mass point elements, while the stiffness information is expressed using spring elements. The modeling of the wire harness section is therefore clearly meaningful.

[0173] Because wire harnesses (such as wires) are made up of many layers of different materials wrapped together, if we model them according to the actual structure, we would have to build many layers of structure. The mechanical properties of the specific materials in these layers are different and not easy to find. At the same time, if we model them in detail, the workload will be greatly increased, and a lot of time and effort will be consumed, and the analysis results may not be more accurate.

[0174] The modeling method of "mass point element + spring element" for wire harness in this application is clear in meaning, focuses on the macroscopic key performance (i.e. wire harness stiffness and mass) that affects the structural analysis, is simple and easy to operate.

[0175] In this application, the handling of displacement constraints at the connection point between the brake harness and the vehicle body differs in the static strength analysis and fatigue analysis of the brake harness bracket. In the static strength analysis, a displacement load under the corresponding working condition is applied to this point. In the fatigue analysis, this point is used as the basic motion input end.

[0176] In the analysis of this application, the wire harness model is established using mass point elements and spring elements.

[0177] In static strength analysis, a displacement load is applied to this point because its position differs under various static strength conditions (such as jumping, turning, braking, and acceleration), resulting in varying degrees of elongation or compression of the spring elements in the corresponding model. Applying a displacement load to this point causes the spring elements (i.e., the wiring harness) to generate different forces, thus exerting different effects on the support. This accounts for the effect of the wiring harness on the support, which is the core of this invention.

[0178] In fatigue analysis, this point is used as the basic motion input point because specific finite element analysis software requires this operation. After this operation, the software can identify that different displacements are applied to the model at this point according to the load spectrum. Similarly, the spring element (i.e., the wire harness) will generate different forces, which will have different effects on the support. This takes into account the effect of the wire harness on the support.

[0179] This application also provides a strength analysis device for automotive braking system wiring harness brackets. The device includes a basic information acquisition module for the braking system wiring harness bracket, a finite element model establishment module, a frequency domain load spectrum data acquisition module, a stress response spectrum acquisition module, a static strength analysis module, and a fatigue strength analysis module.

[0180] The Braking System Wiring Harness Support Basic Information Module is used to obtain basic information about the Braking System Wiring Harness Support.

[0181] The finite element model building module is used to build static strength analysis finite element models and fatigue strength finite element analysis models of brake harness brackets based on the basic information of brake system harness brackets.

[0182] The frequency domain load spectrum data acquisition module is used to acquire frequency domain load spectrum data;

[0183] The stress response spectrum acquisition module is used to acquire the stress response spectrum based on the finite element analysis model of the fatigue strength of the brake harness bracket;

[0184] The static strength analysis module is used to analyze the static strength of the automotive braking system wiring harness bracket based on the stress distribution information;

[0185] The fatigue strength analysis module is used to analyze the fatigue strength of the automotive braking system wiring harness bracket based on frequency domain load spectrum data and stress response spectrum.

[0186] It is understandable that the above description of the method also applies to the description of the apparatus.

[0187] This application also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and capable of running on the processor, wherein the processor executes the computer program to implement the above-mentioned method for strength analysis of automotive braking system wiring harness brackets.

[0188] This application also provides a computer-readable storage medium storing a computer program that, when executed by a processor, can implement the above-described method for strength analysis of automotive braking system wiring harness brackets.

[0189] Figure 2 This is an exemplary structural diagram of an electronic device capable of implementing the strength analysis method for automotive braking system wiring harness brackets provided in one embodiment of this application.

[0190] like Figure 3 As shown, the electronic device includes an input device 501, an input interface 502, a central processing unit 503, a memory 504, an output interface 505, and an output device 506. The input interface 502, central processing unit 503, memory 504, and output interface 505 are interconnected via a bus 507. The input device 501 and output device 506 are connected to the bus 507 via the input interface 502 and output interface 505, respectively, and thus connected to other components of the electronic device. Specifically, the input device 504 receives input information from the outside and transmits it to the central processing unit 503 via the input interface 502. The central processing unit 503 processes the input information based on computer-executable instructions stored in the memory 504 to generate output information, temporarily or permanently storing the output information in the memory 504, and then transmitting the output information to the output device 506 via the output interface 505. The output device 506 outputs the output information to the outside of the electronic device for user use.

[0191] In other words, Figure 2 The illustrated electronic device may also be implemented as including: a memory storing computer-executable instructions; and one or more processors, which can be coupled when executing the computer-executable instructions. Figure 1 The method for strength analysis of automotive braking system wiring harness brackets is described.

[0192] In one embodiment, Figure 2 The electronic device shown can be implemented to include: a memory 504 configured to store executable program code; and one or more processors 503 configured to run the executable program code stored in the memory 504 to perform the acceleration-based automotive fuel cell drainage control method in the above embodiments.

[0193] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0194] Memory may include non-persistent storage in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM. Memory is an example of computer-readable media.

[0195] Computer-readable media include both permanent and non-permanent, removable and non-removable media, and information storage can be achieved by any method or technology. Information can be computer-readable instructions, data structures, program modules, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, DVD or other optical storage, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other non-transfer medium that can be used to store information accessible by a computing device.

[0196] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0197] Furthermore, it is clear that the word "comprising" does not exclude other units or steps. Multiple units, modules, or devices recited in the apparatus claims may also be implemented by a single unit or overall apparatus via software or hardware.

[0198] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of this application. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code, which includes one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the blocks may occur in a different order than those marked in the drawings. For example, two consecutively marked blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in a block diagram and / or flowchart, and combinations of blocks in block diagrams and / or the overall flowchart, can be implemented using a dedicated hardware-based system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions.

[0199] In this embodiment, the processor may be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor.

[0200] Memory can be used to store computer programs and / or modules. The processor implements various functions of the device / terminal equipment by running or executing the computer programs and / or modules stored in the memory, and by accessing data stored in the memory. Memory can mainly include a program storage area and a data storage area. The program storage area can store the operating system, application programs required for at least one function (such as sound playback function, image playback function, etc.), etc.; the data storage area can store data created based on the use of the mobile phone (such as audio data, phonebook, etc.). In addition, memory can include high-speed random access memory, and can also include non-volatile memory, such as hard disk, RAM, plug-in hard disk, smart media card (SMC), secure digital (SD) card, flash card, at least one disk storage device, flash memory device, or other volatile solid-state storage device.

[0201] In this embodiment, if the modules / units integrated into the device / terminal equipment are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, all or part of the processes in the methods of the above embodiments of the present invention can also be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when the computer program is executed by a processor, it can implement the steps of the various method embodiments described above. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. The computer-readable medium can include: any entity or device capable of carrying computer program code, recording media, USB flash drives, portable hard drives, magnetic disks, optical disks, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signals, telecommunication signals, and software distribution media, etc. It should be noted that the content contained in the computer-readable medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. Although this application discloses preferred embodiments as described above, it is not intended to limit this application. Any person skilled in the art can make possible changes and modifications without departing from the spirit and scope of this application. Therefore, the scope of protection of this application should be determined by the scope defined in the claims of this application.

[0202] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0203] Furthermore, it is clear that the word "comprising" does not exclude other units or steps. Multiple units, modules, or devices recited in the apparatus claims may also be implemented by a single unit or overall apparatus via software or hardware.

[0204] Although the present invention has been described in detail above with general descriptions and specific embodiments, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A method for strength analysis of a wiring harness bracket in an automotive braking system, wherein the braking system includes a braking harness bracket, a braking harness, and a harness connector, characterized in that, The strength analysis method for the automotive braking system wiring harness bracket includes: Obtain basic information about the braking system wiring harness bracket; Based on the basic information of the braking system wiring harness bracket, establish a static strength analysis finite element model and a fatigue strength analysis finite element model of the braking wiring harness bracket respectively. The stress distribution information of the brake harness bracket under static load is obtained based on the static strength analysis finite element model of the brake harness bracket. Acquire frequency domain load spectrum data; The stress response spectrum was obtained based on the finite element analysis model of the fatigue strength of the brake harness bracket. The static strength of the automotive braking system wiring harness bracket is analyzed based on the stress distribution information. The fatigue strength of the automotive braking system wiring harness bracket is analyzed based on the frequency domain load spectrum data and stress response spectrum. The acquisition of basic information about the braking system wiring harness bracket includes: Obtain static strength and fatigue strength conditions; Obtain the maximum acceleration load information of the braking system wiring harness bracket under static strength conditions; Obtain load spectrum data for fatigue strength conditions; Obtain the stiffness information of each segment of the braking system wiring harness after it has been segmented; Obtain the position of the connection point between the braking system wiring harness and the vehicle body relative to the wheel center point when the vehicle is statically fully loaded; Under various static strength conditions, obtain the extreme positions of the connection points between the braking system wiring harness and the vehicle body relative to the wheel center point; Obtain the displacement vector of the extreme position of the connection point between the braking system wiring harness and the vehicle body relative to the wheel center point under various static strength conditions, relative to the position of the connection point between the braking system wiring harness and the vehicle body relative to the wheel center point under static full load of the vehicle. The acquisition of basic information about the braking system wiring harness bracket further includes the quality information of each segment of the wiring harness. The step of establishing a static strength analysis finite element model for the brake harness bracket based on the basic information of the brake system harness bracket includes: A finite element model of the brake harness bracket is established using two-dimensional shell elements or three-dimensional solid elements, and material properties are assigned to it. The brake harness is divided into segments, and mass point units are established for each segment of the harness. The mass of the wire harness connector and the sensor is characterized by a mass point unit established at the location of their centroid. Obtain the location of the connection point between the brake harness and the vehicle body; Constrain the brake harness bracket and the ends of each harness. The static strength conditions include the upward jump limit condition, emergency acceleration condition, braking condition, and extreme cornering condition; The fatigue strength conditions include random vibration fatigue conditions; The information on the maximum acceleration load on the braking system harness bracket under static strength conditions includes: Under the extreme condition of upward jump, obtain the maximum acceleration load of the braking harness support system under the extreme condition of upward jump; Obtain the maximum acceleration load on the brake harness support system under emergency acceleration or braking conditions. Under extreme cornering conditions, the maximum acceleration load experienced by the brake harness support system during extreme cornering is obtained. The process of obtaining the extreme positions of the wiring harness connection point to the vehicle body relative to the wheel center point under various static strength conditions includes: Under the aforementioned extreme upward jump condition, with the wheel center as the reference point, the extreme position of the connection point between the wiring harness and the vehicle body relative to the wheel center is determined, and the extreme upward jump displacement vector of this position relative to the position of the connection point between the braking system wiring harness and the vehicle body relative to the wheel center is obtained. Under the emergency acceleration or braking conditions, with the wheel center as the reference point, the extreme position of the connection point between the harness and the vehicle body relative to the wheel center is determined, and the displacement vector of this position relative to the position of the connection point between the braking system harness and the vehicle body relative to the wheel center is obtained under the emergency acceleration or braking conditions. Under the extreme turning condition, with the wheel center as the reference point, the extreme position of the connection point between the wiring harness and the vehicle body relative to the wheel center is determined, and the extreme turning displacement vector of this position relative to the position of the connection point between the braking system wiring harness and the vehicle body relative to the wheel center is obtained. The process of obtaining stress distribution information of the brake harness bracket under static load conditions based on the static strength analysis finite element model of the brake harness bracket includes: Under the aforementioned extreme condition of upward jump, the maximum acceleration load of the upper limit is applied to the static strength analysis finite element model of the brake harness bracket, and a displacement load is applied at the connection point between the brake harness and the vehicle body according to the aforementioned displacement vector of the upper limit, and the stress distribution of the brake harness bracket under the upper limit condition of upward jump is calculated. Under the emergency acceleration or braking conditions, the maximum acceleration load under the emergency acceleration or braking conditions is applied to the finite element model of the brake harness bracket static strength analysis, and the displacement load is applied at the connection point between the harness and the vehicle body according to the displacement vector under the emergency acceleration or braking conditions. The stress distribution of the brake harness bracket under the emergency acceleration or braking conditions is calculated. Under the extreme cornering condition, the maximum acceleration load of the extreme cornering is applied to the static strength analysis finite element model of the brake harness bracket, and the displacement load is applied at the connection point between the harness and the vehicle body according to the extreme cornering displacement vector, and the stress distribution of the brake harness bracket under the extreme cornering condition is calculated. The step of establishing a finite element analysis model for the fatigue strength of the braking harness bracket based on the basic information of the braking system harness bracket includes: Obtain the finite element model for static strength analysis of the brake harness bracket; The connection point between the brake harness and the vehicle body in the static strength analysis finite element model of the brake harness bracket is used as the basic motion input end to form a finite element model for fatigue strength analysis of the brake system bracket. The process of obtaining the stress response spectrum based on the finite element analysis model of the fatigue strength of the brake harness bracket includes: Frequency response analysis was performed on the finite element model of the brake system bracket for fatigue strength analysis to obtain the stress response spectrum of the structure; The analysis of the static strength of the automotive braking system wiring harness bracket based on the stress distribution information includes: Obtain the stress distribution under extreme conditions of upward jump, stress distribution under emergency acceleration or braking, and stress distribution under extreme cornering conditions; Obtain the mechanical properties of the brake harness bracket material; The stress distribution under extreme conditions of upward jump, emergency acceleration or braking, and extreme cornering is compared with the mechanical properties of the brake harness bracket material, and the bracket is judged to meet the static strength requirements based on the comparison results. The fatigue strength analysis of the automotive braking system wiring harness bracket based on the frequency domain load spectrum data and stress response spectrum includes: The damage value of the harness bracket is obtained based on the frequency domain load spectrum data, the stress response spectrum, and the mechanical properties of the brake harness bracket material. Determine whether the damage value of the wire harness bracket is less than the damage threshold. If it is, the bracket fatigue strength is determined to meet the requirements; if the damage value is greater than the threshold, the bracket fatigue strength is determined to not meet the requirements.

2. A strength analysis device for automotive braking system wiring harness brackets, used in the strength analysis method for automotive braking system wiring harness brackets as described in claim 1, characterized in that, The automotive braking system wiring harness bracket strength analysis device includes: A braking system wiring harness bracket basic information acquisition module, wherein the braking system wiring harness bracket basic information acquisition module is used to acquire basic information of the braking system wiring harness bracket; The finite element model establishment module is used to establish a static strength analysis finite element model and a fatigue strength finite element analysis model of the brake harness bracket based on the basic information of the brake system harness bracket. A frequency domain load spectrum data acquisition module, wherein the frequency domain load spectrum data acquisition module is used to acquire frequency domain load spectrum data; A stress response spectrum acquisition module is used to acquire the stress response spectrum based on the finite element analysis model of the fatigue strength of the brake harness bracket. A static strength analysis module is used to analyze the static strength of the automotive braking system wiring harness bracket based on stress distribution information. The fatigue strength analysis module is used to analyze the fatigue strength of the automotive braking system wiring harness bracket based on the frequency domain load spectrum data and stress response spectrum.

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