Evaluation Method, Device and Electronic Equipment for Mounting Bolt Assembly Parameters

Abstract

The present invention provides a method, a device and an electronic device for evaluating the assembly parameters of suspension bolts. In this evaluation method, first, the reaction forces of each suspension bolt in the target suspension system under various preset working condition loads are determined through simulation software, and then the tangential resultant force of each suspension bolt is calculated based on the reaction forces of each suspension bolt. Furthermore, based on the tangential resultant force of each suspension bolt, the rated tangential friction force that each suspension bolt in the target suspension system can withstand various preset working condition loads is evaluated from the perspective of the slip safety factor. Finally, the assembly parameters of each suspension bolt in the target suspension system are obtained based on the rated tangential friction force of the suspension bolts. The method of the present invention evaluates the assembly parameters of each suspension bolt in the target suspension system from the perspective of the slip safety factor on the basis of the reaction forces of each suspension bolt determined by simulation means, and the obtained assembly parameters of the suspension bolts are more accurate and appropriate.

Description

Technical Field

[0001] The invention relates to the technical field of simulation, and in particular to a method, a device and an electronic device for evaluating assembly parameters of a suspension bolt. Background Art

[0002] At present, for extended-range hybrid vehicles, the assembly parameters of the initial bolts (including: model, torque range and tightening process) are generally determined based on experience. For example, the suspension bolts on the range extender suspension system are installed according to the model, torque range and tightening process of the suspension bolts determined by experience. However, for the range extender suspension system, the front-wheel drive suspension system and the rear-wheel drive suspension system, the force of the suspension is different from that of ordinary fuel vehicles and parallel hybrid vehicles. In addition, for different models, the force of the suspension bracket is different due to different structural layouts. Therefore, it is inaccurate to determine the assembly parameters of the suspension bolts based solely on experience. If the assembly parameters of the suspension bolts are over-designed, it will cause high costs. If the assembly parameters of the suspension bolts are under-designed, it will cause the suspension bolts to fail, resulting in the risk of slippage, and then bring a series of safety accidents (for example, suspension fractures, etc.). It can be seen that it is extremely important to determine appropriate and accurate suspension bolt assembly parameters.

[0003] Although it has been proposed in the relevant manuals on bolt verification that the assembly parameters of the bolts can be evaluated by means of simulation, there is no relevant record in the prior art on how to accurately evaluate the assembly parameters of the suspension bolts by means of simulation.

[0004] In summary, how to evaluate and obtain accurate assembly parameters of suspension bolts is a technical problem that urgently needs to be solved. Summary of the invention

[0005] In view of this, an object of the present invention is to provide a method, device and electronic device for evaluating assembly parameters of a suspension bolt, so as to alleviate the technical problem that the prior art cannot evaluate and obtain accurate assembly parameters of the suspension bolt.

[0006] In a first aspect, an embodiment of the present invention provides a method for evaluating assembly parameters of a suspension bolt, comprising:

[0007] Determine the stress of each suspension in the target suspension system under various preset working loads by means of a first simulation software;

[0008] Determine the support reaction force of each suspension bolt corresponding to each suspension under each preset working condition load by using the second simulation software and the force of each suspension under each preset working condition load;

[0009] Calculating the tangential resultant force of each suspension bolt based on the support reaction force of each suspension bolt;

[0010] Calculating the rated tangential friction force of the suspension bolt based on a preset slip safety factor threshold and the tangential resultant force of each suspension bolt;

[0011] The assembly parameters of each suspension bolt in the target suspension system are determined based on the rated tangential friction force of the suspension bolt.

[0012] Furthermore, the forces of each suspension in the target suspension system under various preset working loads are determined by the first simulation software, including:

[0013] Inputting parameter information of a target suspension system into the first simulation software to construct a rigid body model of the target suspension system in the first simulation software;

[0014] The various preset working condition loads are applied to the rigid body model, thereby obtaining the forces of the various suspensions under the various preset working condition loads.

[0015] Further, the target suspension system includes: a target device, a suspension, and a suspension bolt for fixing the suspension to the target device, and the support reaction force of each suspension bolt corresponding to each suspension under each preset working condition load is determined by the second simulation software and the force of each suspension under each preset working condition load, including:

[0016] Constructing a finite element model of the target suspension system by using a second simulation software, wherein in the finite element model, each of the suspension bolts is simulated by a beam unit;

[0017] The forces under each preset working condition load are applied to each suspension in the finite element model, and the support reaction forces of the target nodes of each beam unit under each preset working condition load are extracted, thereby obtaining the support reaction forces of each suspension bolt corresponding to each suspension under each preset working condition load, wherein the target node is the node corresponding to the position of the contact surface between each suspension and the target device.

[0018] Further, the support reaction force includes: an axial support reaction force, a first tangential support reaction force and a second tangential support reaction force perpendicular to the axial support reaction force, and the tangential resultant force of each suspension bolt is calculated based on the support reaction force of each suspension bolt, including:

[0019] Calculation formula of tangential force Calculate the tangential force of each suspension bolt, where F K represents the tangential force, RF 1 represents the first tangential support reaction force, RF 2 Represents the second tangential support reaction force.

[0020] Further, after calculating the tangential resultant force of each suspension bolt based on the support reaction force of each suspension bolt, and before calculating the rated tangential friction force of the suspension bolt based on a preset slip safety factor threshold and the tangential resultant force of each suspension bolt, the method further includes:

[0021] Calculating the rated tangential friction force of the suspension bolt based on preset suspension bolt assembly parameters;

[0022] Calculating the sliding safety factor of each suspension bolt according to the tangential resultant force of each suspension bolt and the rated tangential friction force of the suspension bolt;

[0023] Determining whether the slip safety factor of each suspension bolt meets a preset condition, wherein the preset condition is that the difference between the slip safety factor of each suspension bolt and the preset slip safety factor threshold is greater than a first preset threshold and less than a second preset threshold;

[0024] If the preset conditions are met, the preset suspension bolt assembly parameters are used as assembly parameters of each suspension bolt in the target suspension system;

[0025] If the preset condition is not met, a step of calculating the rated tangential friction force of the suspension bolt based on a preset slip safety factor threshold and the tangential resultant force of each suspension bolt is performed.

[0026] Further, the target suspension system includes: a target device, a suspension, and a suspension bolt for fixing the suspension to the target device, and calculating the rated tangential friction force of the suspension bolt based on preset suspension bolt assembly parameters includes:

[0027] Obtaining the friction coefficient between the contact surface of each suspension and the target device;

[0028] Determining a discreteness corresponding to the tightening process based on the tightening process in the preset suspension bolt assembly parameters;

[0029] Determining a target minimum preload force corresponding to the preset suspension bolt assembly parameters according to the preset suspension bolt assembly parameters and a preset preload force database;

[0030] According to the formula F, the rated tangential friction force is calculated KQerf =F M ·μ T k is used to calculate the rated tangential friction force of the suspension bolt, where F KQerf represents the rated tangential friction force of the suspension bolt, F M represents the target minimum preload force, μ T represents the friction coefficient, and k represents the dispersion.

[0031] Furthermore, the sliding safety factor of each suspension bolt is calculated according to the tangential resultant force of each suspension bolt and the rated tangential friction force of the suspension bolt, including:

[0032] Calculation formula based on slip safety factor Calculate the slip safety factor of each suspension bolt, where S G represents the slip safety factor of each suspension bolt, F KQerf represents the rated tangential friction force of the suspension bolt, F K represents the tangential resultant force of each suspension bolt.

[0033] Furthermore, the rated tangential friction force of the suspension bolt is calculated based on a preset slip safety factor threshold and the tangential resultant force of each suspension bolt, including:

[0034] Determining a maximum tangential resultant force among the tangential resultant forces of the suspension bolts;

[0035] Calculating the sum of the preset slip safety factor threshold and the first preset threshold;

[0036] The calculated sum is multiplied by the maximum tangential resultant force, and the obtained product result is used as the rated tangential friction force of the suspension bolt.

[0037] Further, the target suspension system includes: a target device, a suspension, and a suspension bolt for fixing the suspension to the target device, and determining assembly parameters of each suspension bolt in the target suspension system based on the rated tangential friction force of the suspension bolt includes:

[0038] Obtaining the friction coefficient between the contact surface of each suspension and the target device, and obtaining the discreteness corresponding to various tightening processes;

[0039] According to the minimum preload calculation formula Calculate the minimum preload force of each suspension bolt in the target suspension system under each tightening process, where F M represents the minimum preload force of each suspension bolt in the target suspension system under each tightening process, F KQerf represents the rated tangential friction force of the suspension bolt, μ T represents the friction coefficient, and k represents the discreteness corresponding to each tightening process;

[0040] Determining target suspension bolt assembly parameters corresponding to the minimum pre-tightening force of each suspension bolt in the target suspension system according to the minimum pre-tightening force of each suspension bolt in the target suspension system under each tightening process and a preset pre-tightening force database;

[0041] The target suspension bolt assembly parameters are used as assembly parameters of each suspension bolt in the target suspension system.

[0042] Furthermore, after determining the forces of each suspension in the target suspension system under various preset working loads by the first simulation software, the method further includes:

[0043] Determining a target preset working condition load among all preset working condition loads according to the forces of each suspension under various preset working condition loads;

[0044] Determining the support reaction force of each suspension bolt corresponding to each suspension under each preset working condition load through the second simulation software and the force of each suspension under each preset working condition load, including: determining the support reaction force of each suspension bolt corresponding to each suspension under each target preset working condition load through the second simulation software and the force of each suspension under each target preset working condition load.

[0045] Furthermore, the target suspension system at least includes: a range extender suspension system, a front drive suspension system and a rear drive suspension system.

[0046] In a second aspect, an embodiment of the present invention further provides a device for evaluating assembly parameters of a suspension bolt, comprising:

[0047] A first determination unit, used to determine the forces of each suspension in the target suspension system under various preset working loads through a first simulation software;

[0048] A second determination unit is used to determine the support reaction force of each suspension bolt corresponding to each suspension under each preset working condition load by using a second simulation software and the force of each suspension under each preset working condition load;

[0049] A first calculation unit, configured to calculate a tangential resultant force of each suspension bolt based on a support reaction force of each suspension bolt;

[0050] A second calculation unit, configured to calculate a rated tangential friction force of the suspension bolt based on a preset slip safety factor threshold and a tangential resultant force of each of the suspension bolts;

[0051] The third determining unit is configured to determine assembly parameters of each suspension bolt in the target suspension system based on the rated tangential friction force of the suspension bolt.

[0052] In a third aspect, an embodiment of the present invention further provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of any one of the methods described in the first aspect when executing the computer program.

[0053] In a fourth aspect, an embodiment of the present invention further provides a computer-readable storage medium, wherein the computer-readable storage medium stores machine-executable instructions. When the machine-executable instructions are called and executed by a processor, the machine-executable instructions prompt the processor to execute any method described in the first aspect above.

[0054] In an embodiment of the present invention, a method for evaluating assembly parameters of suspension bolts is provided, comprising: determining the forces of each suspension in a target suspension system under various preset working loads through a first simulation software; determining the support reaction forces of each suspension bolt corresponding to each suspension under each preset working load through a second simulation software and the forces of each suspension under each preset working load; calculating the tangential resultant force of each suspension bolt based on the support reaction forces of each suspension bolt; calculating the rated tangential friction force of the suspension bolt based on a preset slip safety factor threshold and the tangential resultant force of each suspension bolt; and determining the assembly parameters of each suspension bolt in the target suspension system based on the rated tangential friction force of the suspension bolt. It can be seen from the above description that in the method for evaluating the assembly parameters of suspension bolts of the present invention, the support reaction force of each suspension bolt in the target suspension system under various preset working condition loads is first determined by simulation software, and then the tangential resultant force of each suspension bolt is calculated based on the support reaction force of each suspension bolt, and then the rated tangential friction force of each suspension bolt in the target suspension system that can withstand various preset working condition loads is evaluated from the perspective of the slip safety factor based on the tangential resultant force of each suspension bolt, and finally the assembly parameters of each suspension bolt in the target suspension system are obtained based on the rated tangential friction force of the suspension bolt. The method for evaluating the assembly parameters of suspension bolts of the present invention is to evaluate the assembly parameters of each suspension bolt in the target suspension system from the perspective of the slip safety factor on the basis of the support reaction force of each suspension bolt determined by simulation means, and the obtained assembly parameters of the suspension bolts are more accurate and appropriate, which can withstand various preset working condition loads and will not be over-designed, thereby alleviating the technical problem that the prior art cannot evaluate and obtain accurate assembly parameters of suspension bolts. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0056] Figure 1 A flowchart of a method for evaluating assembly parameters of a suspension bolt provided by an embodiment of the present invention;

[0057] Figure 2 A schematic diagram of a range extender suspension system provided by an embodiment of the present invention;

[0058] Figure 3 The embodiment of the present invention provides Figure 2 A top view along the AA direction;

[0059] Figure 4 The embodiment of the present invention provides Figure 3 The local cross-sectional view corresponding to the BB direction;

[0060] Figure 5 The embodiment of the present invention provides Figure 4 The corresponding finite element model;

[0061] Figure 6 A schematic diagram of a curve between the rotation angle and the axial preload provided in an embodiment of the present invention;

[0062] Figure 7 A schematic diagram of a device for evaluating assembly parameters of a suspension bolt provided by an embodiment of the present invention;

[0063] Figure 8 A schematic diagram of an electronic device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0064] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0065] At present, for the range extender suspension system, front-wheel drive suspension system and rear-wheel drive suspension system, the assembly parameters of the suspension bolts are determined based on experience. However, for different models, due to different structural layouts, the forces on the suspension brackets are also different. Therefore, it is inaccurate to determine the assembly parameters of the suspension bolts based solely on experience.

[0066] Based on this, in the method for evaluating the assembly parameters of suspension bolts of the present invention, the support reaction force of each suspension bolt in the target suspension system under various preset working condition loads is first determined by simulation software, and then the tangential resultant force of each suspension bolt is calculated based on the support reaction force of each suspension bolt, and then the rated tangential friction force of each suspension bolt in the target suspension system that can withstand various preset working condition loads is evaluated from the perspective of the slip safety factor based on the tangential resultant force of each suspension bolt, and finally the assembly parameters of each suspension bolt in the target suspension system are obtained based on the rated tangential friction force of the suspension bolt. The method for evaluating the assembly parameters of suspension bolts of the present invention is to evaluate the assembly parameters of each suspension bolt in the target suspension system from the perspective of the slip safety factor on the basis of the support reaction force of each suspension bolt determined by simulation means, and the obtained assembly parameters of the suspension bolts are more accurate and appropriate, which can withstand various preset working condition loads and will not be over-designed.

[0067] To facilitate understanding of this embodiment, a method for evaluating assembly parameters of a suspension bolt disclosed in an embodiment of the present invention is first introduced in detail.

[0068] Embodiment 1:

[0069] According to an embodiment of the present invention, an embodiment of a method for evaluating assembly parameters of a suspension bolt is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0070] Figure 1 is a flow chart of a method for evaluating assembly parameters of a suspension bolt according to an embodiment of the present invention. Figure 1 As shown, the method comprises the following steps:

[0071] Step S102, determining the forces of each suspension in the target suspension system under various preset working loads by using a first simulation software;

[0072] In the embodiment of the present invention, the target suspension system at least includes: a range extender suspension system, a front drive suspension system and a rear drive suspension system. The embodiment of the present invention does not specifically limit the above target suspension system, and it can also be other suspension systems.

[0073] In order to have a deeper understanding of the target suspension system, the target suspension system is explained below by taking the range extender suspension system as an example. Figure 2 A schematic diagram of the range extender suspension system is shown in FIG. Figure 3 for Figure 2A top view along the AA direction, wherein the range extender suspension system includes: an engine assembly, a generator assembly, a suspension (i.e., a suspension bracket), and suspension bolts for fixing the suspension to the engine assembly and the generator assembly, from Figure 3 It can be seen that the suspension 1 (T-shaped suspension bracket) is fixed to the generator assembly by three suspension bolts. Figure 3 After cutting in the BB direction, we get the same Figure 3 The local cross-sectional view corresponding to the BB direction is as follows: Figure 4 As shown, from Figure 4 It can be seen that the suspension bolt (i.e. Figure 4 The bolts in the bracket pass through the mounting surface of the suspension (i.e. Figure 4 The mounting flange surface of the generator assembly (i.e. Figure 4 The generator mounting flange surface in the generator assembly), the suspension bolts are threadedly connected to the mounting flange surface of the generator assembly, and by applying appropriate pre-tightening force to the suspension bolts, the suspension and the generator assembly can be tightly connected under various working loads without slipping.

[0074] The above preset load conditions are 28 load conditions of the suspension system, including: static design position, maximum forward engine torque, maximum reverse engine torque, maximum forward engine torque & forward speed, maximum forward engine torque & left turn, maximum forward engine torque & right turn, maximum forward engine torque & vertical downward impact, maximum forward engine torque & vertical rebound, maximum reverse engine torque & reverse acceleration, 8KPH front impact (-11g), 8KPH rear impact (+11g), vertical impact ... vertical downward impact, maximum forward engine torque & vertical rebound, maximum reverse engine torque & reverse acceleration, 8KPH front impact (-11g), 8KPH rear impact (+11g), vertical impact, maximum forward engine torque & vertical downward impact, maximum forward engine torque & vertical rebound, maximum reverse engine torque & reverse acceleration, 8KPH front impact (-11g), 8KPH rear impact (+11g), vertical impact, maximum forward engine torque & vertical downward impact, maximum forward engine torque & vertical rebound, maximum reverse engine torque & reverse acceleration, 8KPH front impact (-11g), 8KPH rear impact (+11g), vertical impact, maximum forward engine torque & vertical downward impact, maximum forward engine torque & vertical rebound, maximum reverse engine torque & reverse acceleration, 8KPH front impact ( Upward loading (deep pit), vertical downward loading (deep pit), lateral left loading, lateral right loading, vertical upward & lateral left loading, vertical upward & lateral right loading, vertical downward & lateral left loading, vertical downward & lateral left loading, bad road up, bad road down, forward longitudinal loading (full throttle acceleration), reverse longitudinal loading (full throttle acceleration), full throttle N to D gear / clutch low gear full throttle engagement, full throttle N to R gear / clutch reverse gear full throttle engagement, 1 times g-acceleration load, partial forward torque, partial reverse torque.

[0075] The first simulation software may be a multi-body dynamics software, specifically ADAMS, or MATLAB. The embodiment of the present invention does not impose any specific limitation on the first simulation software, as long as it can extract the forces of the suspension under various preset working conditions.

[0076] Step S104, determining the support reaction force of each suspension bolt corresponding to each suspension under each preset working condition load by using the second simulation software and the force of each suspension under each preset working condition load;

[0077] The above-mentioned second simulation software can be finite element structural software, specifically ABAQUS software, or ANSYS software. The embodiment of the present invention does not impose specific restrictions on the above-mentioned second simulation software, as long as it can extract the support reaction force of each suspension bolt corresponding to each suspension under each preset working condition load.

[0078] The above-mentioned support reaction force refers to the support reaction force of each suspension bolt under the action of various preset working condition loads obtained by simulation after various preset working condition loads are applied to the model of the target suspension system in the simulation software.

[0079] Step S106, calculating the tangential resultant force of each suspension bolt based on the support reaction force of each suspension bolt;

[0080] Specifically, the above-mentioned support reaction forces are support reaction forces in three directions. Since the present invention evaluates the assembly parameters of the suspension bolts from the perspective of the sliding safety factor, only the tangential support reaction forces are considered, so that the tangential resultant force of each suspension bolt is calculated based on the tangential support reaction forces of each suspension bolt.

[0081] Step S108, calculating the rated tangential friction force of the suspension bolts based on a preset slip safety factor threshold and the tangential resultant force of each suspension bolt;

[0082] Specifically, the rated tangential friction of the above-mentioned suspension bolts refers to the minimum tangential friction that the suspension bolts should have. Only when the suspension bolts meet the above-mentioned rated tangential friction can they withstand various preset working condition loads. In addition, it does not mean that the larger the rated tangential friction, the better. Although the larger the rated tangential friction, the better the safety of the suspension bolts and the higher the reliability of the target suspension system, the larger the rated tangential friction, the higher the cost of the corresponding suspension bolt model and tightening process. In other words, over-design of assembly parameters will cause high cost problems. Therefore, the optimal design is that the suspension bolts just meet the above-mentioned rated tangential friction.

[0083] Step S110 : determining assembly parameters of each suspension bolt in the target suspension system based on the rated tangential friction force of the suspension bolt.

[0084] The process is described in detail below and will not be repeated here.

[0085] In an embodiment of the present invention, a method for evaluating assembly parameters of suspension bolts is provided, comprising: determining the forces of each suspension in a target suspension system under various preset working loads through a first simulation software; determining the support reaction forces of each suspension bolt corresponding to each suspension under each preset working load through a second simulation software and the forces of each suspension under each preset working load; calculating the tangential resultant force of each suspension bolt based on the support reaction forces of each suspension bolt; calculating the rated tangential friction force of the suspension bolt based on a preset slip safety factor threshold and the tangential resultant force of each suspension bolt; and determining the assembly parameters of each suspension bolt in the target suspension system based on the rated tangential friction force of the suspension bolt. It can be seen from the above description that in the method for evaluating the assembly parameters of suspension bolts of the present invention, the support reaction force of each suspension bolt in the target suspension system under various preset working condition loads is first determined by simulation software, and then the tangential resultant force of each suspension bolt is calculated based on the support reaction force of each suspension bolt, and then the rated tangential friction force of each suspension bolt in the target suspension system that can withstand various preset working condition loads is evaluated from the perspective of the slip safety factor based on the tangential resultant force of each suspension bolt, and finally the assembly parameters of each suspension bolt in the target suspension system are obtained based on the rated tangential friction force of the suspension bolt. The method for evaluating the assembly parameters of suspension bolts of the present invention is to evaluate the assembly parameters of each suspension bolt in the target suspension system from the perspective of the slip safety factor on the basis of the support reaction force of each suspension bolt determined by simulation means, and the obtained assembly parameters of the suspension bolts are more accurate and appropriate, which can withstand various preset working condition loads and will not be over-designed, thereby alleviating the technical problem that the prior art cannot evaluate and obtain accurate assembly parameters of suspension bolts.

[0086] The above content briefly introduces the evaluation method of the suspension bolt assembly parameters of the present invention, and the specific contents involved are described in detail below.

[0087] In an optional embodiment of the present invention, the above step S102, determining the forces of each suspension in the target suspension system under various preset working loads by means of the first simulation software, specifically includes:

[0088] (1) inputting parameter information of the target suspension system into the first simulation software to construct a rigid body model of the target suspension system in the first simulation software;

[0089] Specifically, for the above-mentioned range extender suspension system, the parameter information of the above-mentioned target suspension system at least includes: the coordinates of the suspension points of the three suspensions, the mass of the engine assembly, the moment of inertia of the engine assembly, the center of mass of the engine assembly, the mass of the generator assembly, the moment of inertia of the generator assembly, the center of mass of the generator assembly, the suspension angle, the dynamic stiffness of the suspension, etc. After inputting the above-mentioned parameter information, a rigid body model of the range extender suspension system can be constructed in the first simulation software.

[0090] (2) Apply various preset working loads to the rigid body model to obtain the forces on each suspension under the various preset working loads.

[0091] After obtaining the rigid body model of the target suspension system, various preset working condition loads are applied to the rigid body model. Specifically, an acceleration load and a torque load (i.e., a preset working condition load) are applied to the center of mass of the rigid body model (i.e., the center of mass of the assembly), and the force of each suspension in the target suspension system under the preset working condition load can be extracted. By applying multiple preset working condition loads in this way, the force of each suspension in the target suspension system under various preset working condition loads (forces in three directions) can be extracted.

[0092] As shown in the following table, the forces on a suspension under various preset load conditions are given in N:

[0093]

[0094]

[0095]

[0096] In an optional embodiment of the present invention, the target suspension system includes: a target device, a suspension, and a suspension bolt for fixing the suspension to the target device, and the support reaction force of each suspension bolt corresponding to each suspension under each preset working condition load is determined by the second simulation software and the force of each suspension under each preset working condition load, specifically including:

[0097] (1) constructing a finite element model of the target suspension system by using a second simulation software, wherein each suspension bolt in the finite element model is simulated by a beam unit;

[0098] In an embodiment of the present invention, if the target suspension system is a range extender suspension system, the target device includes: an engine assembly and a generator assembly. Figure 5 It is shown in Figure 4 Corresponding finite element model, in which the head of the suspension bolt adopts a rod unit, the head area realizes a rigid connection, and the rod part of the suspension bolt adopts a beam unit. The beam unit is composed of multiple nodes, in which the nodes corresponding to the position of the contact surface between the suspension and the target device, that is, the nodes at the contact surface, are shown with dots.

[0099] (2) Apply the force under each preset working condition load to each suspension in the finite element model, and extract the support reaction force of the target node of each beam unit under each preset working condition load, and then obtain the support reaction force of each suspension bolt corresponding to each suspension under each preset working condition load, wherein the target node is the node corresponding to the position of the contact surface between each suspension and the target device.

[0100] Specifically, each suspension in the finite element model is simultaneously subjected to its own force under each preset working condition load, and then the support reaction force of the target node of each beam unit under each preset working condition load is extracted through the secondary development program. For example, the software will output an output file (output file) consisting of a node set consisting of multiple target nodes (one beam unit corresponds to one target node), which contains the support reaction force of each target node. The support reaction force of each target node in the output file is extracted to obtain a table of the support reaction force of each target node.

[0101] The above process takes into account the nonlinear characteristics of the suspension and the corresponding target device (specifically the mounting components of the target device, such as the mounting flange) by establishing a complete finite element model, which is more in line with the actual stress conditions of the entire vehicle, and the results of the support reaction forces of each suspension bolt are more accurate.

[0102] The above simulation process comprehensively considers various working conditions of hybrid vehicles on the road. In addition, when experimental measurement is not possible, the simulation method can effectively predict the support reaction force of its suspension bolts. Ultimately, the assembly parameters of each suspension bolt of the target suspension system determined based on the support reaction force of each suspension bolt and the preset slip safety factor threshold are more accurate and appropriate.

[0103] In an optional embodiment of the present invention, the support reaction force includes: an axial support reaction force, a first tangential support reaction force and a second tangential support reaction force perpendicular to the axial support reaction force. The above step S106 calculates the tangential resultant force of each suspension bolt based on the support reaction force of each suspension bolt, and specifically includes:

[0104] Calculation formula of tangential force Calculate the tangential force of each suspension bolt, where F K represents the tangential force, RF 1 Represents the first tangential support reaction force, RF 2 Represents the second tangential support reaction force.

[0105] The first tangential support reaction force and the second tangential support reaction force are support reaction forces on the contact surface.

[0106] As shown in the following table, the tangential resultant force of each suspension bolt corresponding to each suspension in the range extender suspension system under the target preset working condition load is given:

[0107]

[0108]

[0109]

[0110] In an optional embodiment of the present invention, the above step S108, calculating the rated tangential friction force of the suspension bolt based on the preset slip safety factor threshold and the tangential resultant force of each suspension bolt, specifically includes:

[0111] (1) Determine the maximum tangential force among the tangential forces of each suspension bolt;

[0112] As can be seen from the example in the above table, the maximum tangential force is 8059.69.

[0113] (2) calculating the sum of a preset slip safety factor threshold and a first preset threshold;

[0114] In an embodiment of the present invention, the preset slip safety factor threshold may be 0.9, the first preset threshold may be 0.3, the first preset threshold is a tolerance, and the embodiment of the present invention does not impose specific restrictions on the values ​​of the preset slip safety factor threshold and the first preset threshold.

[0115] (3) The calculated sum is multiplied by the maximum tangential resultant force, and the product obtained is used as the rated tangential friction force of the suspension bolt.

[0116] As in the above example, the rated tangential friction force of the suspension bolt = 8059.69*1.2 = 9671.628.

[0117] The above-mentioned rated tangential friction force is also the friction force transmitting the lateral load on the contact surface, that is, the tangential friction force generated by the suspension bolt.

[0118] In an optional embodiment of the present invention, the target suspension system includes: a target device, a suspension, and a suspension bolt for fixing the suspension to the target device. The above step S110 determines the assembly parameters of each suspension bolt in the target suspension system based on the rated tangential friction force of the suspension bolt, and specifically includes:

[0119] (1) Obtaining the friction coefficient between the contact surfaces of each suspension and the target device, and obtaining the discreteness corresponding to various tightening processes;

[0120] Specifically, if the suspension is made of aluminum alloy and the target device is also made of aluminum alloy, the friction coefficient between the contact surfaces of the two is 0.18. For different contact surface materials, the corresponding friction coefficients are different. The embodiment of the present invention does not impose specific restrictions on the above friction coefficients.

[0121] At present, the tightening process for suspension bolts includes: torque method and torque plus angle method. Among them, the torque method usually limits the maximum preload force of the suspension bolt to the yield point (i.e. Figure 6 The torque plus angle method generally limits the maximum preload of the suspension bolt to Figure 6In the YM zone, it is ideal to control it a little after the yield point with higher accuracy.

[0122] pass Figure 6 It can be seen that within the same range of the angular error △A, the axial preload error △F2 in the plastic zone is much smaller than the axial preload error △F1 in the elastic zone. For these two tightening processes, it is necessary to set their discreteness according to different process conditions. Specifically, the discreteness corresponding to the torque method can be set to 1.4, and the discreteness corresponding to the torque plus angle method can be set to 1.

[0123] (2) Calculation formula based on minimum preload Calculate the minimum preload force of each suspension bolt in the target suspension system under each tightening process, where F M represents the minimum preload force of each suspension bolt in the target suspension system under each tightening process, F KQerf Indicates the rated tangential friction force of the suspension bolt, μ T represents the friction coefficient, and k represents the discreteness corresponding to each tightening process;

[0124] Preload refers to the force along the bolt axis generated between the bolt and the connected parts (suspension and target device) under the action of the tightening torque during the bolt tightening process.

[0125] The size of the preload force is related to the tightening torque of the bolt, the friction between the bolt and the mounting flange of the target device, and the friction between the mounting flange and the suspension. Preload can improve the reliability, anti-loosening ability and fatigue strength of the bolt connection, and enhance the tightness and rigidity of the connection. Therefore, for the forces of different parts under different working conditions, it is necessary to determine the appropriate bolt preload range to achieve the optimal solution while ensuring the normal operation of the parts.

[0126] According to the description in (1) above, the minimum pre-tightening force of each suspension bolt in the target suspension system of the torque method = 9671.628 / (0.18*1.4) = 38379.5; the minimum pre-tightening force of each suspension bolt in the target suspension system of the torque plus angle method = 9671.628 / (0.18*1) = 53731.27.

[0127] (3) determining target suspension bolt assembly parameters corresponding to the minimum pre-tightening force of each suspension bolt in the target suspension system according to the minimum pre-tightening force of each suspension bolt in the target suspension system under each tightening process and a preset pre-tightening force database;

[0128] Specifically, the preset preload database is obtained through the joint experiment of the suspension bolts, including: a preload database corresponding to the torque method and a preload database corresponding to the torque plus angle method, which contains the correspondence between the torque range and the preload of various types of suspension bolts. Therefore, after obtaining the minimum preload of each suspension bolt, the model and torque range of the suspension bolt that meets the minimum preload can be queried in the corresponding preload database, thereby obtaining the target suspension bolt assembly parameters.

[0129] It should be noted that the model and torque range of the suspension bolts that meet the minimum pre-tightening force of each suspension bolt obtained by the torque method can be queried in the pre-tightening force database corresponding to the torque method, and the model and torque range of the suspension bolts that meet the minimum pre-tightening force of each suspension bolt obtained by the torque plus angle method can be queried in the pre-tightening force database corresponding to the torque plus angle method. According to the cost of the two results obtained by the query, a target suspension bolt assembly parameter with a lower cost is selected as the final assembly parameter.

[0130] (4) The target suspension bolt assembly parameters are used as the assembly parameters of each suspension bolt in the target suspension system.

[0131] In an optional embodiment of the present invention, after calculating the tangential resultant force of each suspension bolt based on the support reaction force of each suspension bolt, and before calculating the rated tangential friction force of the suspension bolt based on the preset slip safety factor threshold and the tangential resultant force of each suspension bolt, the method further includes:

[0132] (1) Calculating the rated tangential friction force of the suspension bolt based on preset suspension bolt assembly parameters;

[0133] The inventors have taken into consideration that some preset suspension bolt assembly parameters set by experience are accurate and appropriate to a large extent. Based on this, the inventors have provided another implementation method for determining the assembly parameters of each suspension bolt in the target suspension system. This method is a method for verifying the preset assembly parameters of the suspension bolts to verify whether the preset assembly parameters of the suspension bolts are accurate and appropriate. If they are accurate and appropriate, there is no need to calculate the assembly parameters. If they are not accurate, subsequent assembly parameter calculations are performed.

[0134] Specifically, the rated tangential friction force of the suspension bolt is calculated based on the preset suspension bolt assembly parameters, specifically including:

[0135] (11) obtaining the friction coefficient between the contact surfaces of each suspension and the target device;

[0136] Specifically, if the suspension is made of aluminum alloy and the target device is also made of aluminum alloy, the friction coefficient between the contact surfaces of the two is 0.18. For different contact surface materials, the corresponding friction coefficients are different. The embodiment of the present invention does not impose specific restrictions on the above friction coefficients.

[0137] (12) determining a discreteness corresponding to the tightening process based on the tightening process in the preset suspension bolt assembly parameters;

[0138] For example, the discreteness corresponding to the torque method is 1.4, and the discreteness corresponding to the torque plus angle method is 1.

[0139] (13) determining a target minimum preload force corresponding to the preset suspension bolt assembly parameters according to the preset suspension bolt assembly parameters and the preset preload force database;

[0140] Specifically, a preload force database corresponding to the tightening process in the preset suspension bolt assembly parameters is first determined, and then a target minimum preload force corresponding to the suspension bolt model and torque range in the preset suspension bolt assembly parameters is determined in the preload force database.

[0141] (14) Calculate the rated tangential friction force according to the formula F KQerf =F M ·μ T k is used to calculate the rated tangential friction force of the suspension bolt, where F KQerf Indicates the rated tangential friction force of the suspension bolt, F M Indicates the target minimum preload force, μ T represents the friction coefficient and k represents the dispersion.

[0142] (2) Calculate the slip safety factor of each suspension bolt based on the tangential resultant force of each suspension bolt and the rated tangential friction force of the suspension bolt;

[0143] Specifically, the sliding safety factor of each suspension bolt is calculated according to the tangential resultant force of each suspension bolt and the rated tangential friction force of the suspension bolt, including:

[0144] Calculation formula based on slip safety factor Calculate the slip safety factor of each suspension bolt, where S G Indicates the slip safety factor of each suspension bolt, F KQerf Indicates the rated tangential friction force of the suspension bolt, F K Represents the tangential resultant force of each suspension bolt.

[0145] (3) determining whether the slip safety factor of each suspension bolt meets a preset condition, wherein the preset condition is that the difference between the slip safety factor of each suspension bolt and a preset slip safety factor threshold is greater than a first preset threshold and less than a second preset threshold;

[0146] Specifically, when the slip safety factor of each suspension bolt is greater than a certain value (the sum of a preset slip safety factor threshold and a first preset threshold), each suspension bolt is safe. When a slip safety factor of each suspension bolt exists that is not greater than a certain value, the slip risk is relatively large, and it is necessary to calculate the rated tangential friction force of the suspension bolt based on the preset slip safety factor threshold and the tangential resultant force of each suspension bolt; then, the assembly parameters of each suspension bolt in the target suspension system are determined based on the rated tangential friction force of the suspension bolt, and accurate and appropriate assembly parameters are obtained by matching, that is, the optimal assembly parameters (bolt model, designed torque range and tightening process) are inferred through the preset slip safety factor threshold and the tangential resultant force of each suspension bolt.

[0147] (4) If the preset conditions are met, the preset suspension bolt assembly parameters are used as the assembly parameters of each suspension bolt in the target suspension system;

[0148] (5) If the preset condition is not met, a step of calculating the rated tangential friction force of the suspension bolt based on a preset slip safety factor threshold and the tangential resultant force of each suspension bolt is performed.

[0149] In an optional embodiment of the present invention, after determining the forces of each suspension in the target suspension system under various preset working loads by the first simulation software, the method further includes:

[0150] (1) determining a target preset working condition load among all preset working condition loads according to the forces of each suspension under various preset working condition loads;

[0151] The inventors have considered that the amount of calculation required for subsequent calculation of the forces on the suspension under 28 preset working conditions is too large. Therefore, in order to simplify the amount of calculation, some extreme working conditions can be first determined among the 28 preset working conditions, and it is only necessary to perform subsequent calculations on the forces on the suspension under the extreme working conditions (because under extreme working conditions, if the suspension bolts can meet the requirements, then under some non-extreme working conditions, the suspension bolts must also meet the requirements). Therefore, the target preset working condition load (i.e., the extreme working condition) can be determined among all the preset working condition loads based on the forces on each suspension under various preset working condition loads.

[0152] Specifically, the maximum force and the minimum force are determined among the forces under various preset working condition loads corresponding to a suspension, and the preset working condition loads corresponding to the maximum force and the minimum force are used as the target preset working condition loads. For example, in the table of 28 preset working conditions, working conditions 10, 11, 15, 16, 18, and 19, only the relevant parameters under these 6 working conditions need to be calculated later.

[0153] (2) determining the support reaction force of each suspension bolt corresponding to each suspension under each preset working condition load through the second simulation software and the force of each suspension under each preset working condition load, including: determining the support reaction force of each suspension bolt corresponding to each suspension under each target preset working condition load through the second simulation software and the force of each suspension under each target preset working condition load.

[0154] The method for evaluating the assembly parameters of suspension bolts of the present invention is applicable to any electric vehicle with a suspension system. In the early stage of design, since the test data of the whole vehicle cannot be obtained, setting the assembly parameters of the suspension bolts based on experience requires a certain trial and error cost. Reasonable suspension bolt assembly parameters can be set through simulation analysis, which reduces the trial and error cost in the early stage, avoids the increase in weight and cost caused by over-design, and avoids the problem of slip failure caused by insufficient design (i.e., the risk of cracking between the suspension and the target device due to the loosening and failure of the suspension bolts).

[0155] Embodiment 2:

[0156] An embodiment of the present invention further provides an evaluation device for suspension bolt assembly parameters, which is mainly used to execute the evaluation method for suspension bolt assembly parameters provided in the first embodiment of the present invention. The following is a specific introduction to the evaluation device for suspension bolt assembly parameters provided in the embodiment of the present invention.

[0157] Figure 7 is a schematic diagram of a device for evaluating assembly parameters of a suspension bolt according to an embodiment of the present invention. Figure 7 As shown, the device mainly includes: a first determination unit 10, a second determination unit 20, a first calculation unit 30, a second calculation unit 40 and a third determination unit 50, wherein:

[0158] A first determination unit, used to determine the forces of each suspension in the target suspension system under various preset working loads through a first simulation software;

[0159] A second determination unit is used to determine the support reaction force of each suspension bolt corresponding to each suspension under each preset working condition load by using the second simulation software and the force of each suspension under each preset working condition load;

[0160] A first calculation unit, used for calculating the tangential resultant force of each suspension bolt based on the support reaction force of each suspension bolt;

[0161] A second calculation unit, configured to calculate a rated tangential friction force of the suspension bolt based on a preset slip safety factor threshold and a tangential resultant force of each suspension bolt;

[0162] The third determining unit is configured to determine assembly parameters of each suspension bolt in the target suspension system based on the rated tangential friction force of the suspension bolt.

[0163] In an embodiment of the present invention, a device for evaluating assembly parameters of suspension bolts is provided, comprising: determining the forces of each suspension in a target suspension system under various preset working loads through a first simulation software; determining the support reaction forces of each suspension bolt corresponding to each suspension under each preset working load through a second simulation software and the forces of each suspension under each preset working load; calculating the tangential resultant force of each suspension bolt based on the support reaction forces of each suspension bolt; calculating the rated tangential friction force of the suspension bolt based on a preset slip safety factor threshold and the tangential resultant force of each suspension bolt; and determining the assembly parameters of each suspension bolt in the target suspension system based on the rated tangential friction force of the suspension bolt. It can be known from the above description that in the evaluation device for the assembly parameters of the suspension bolts of the present invention, the support reaction force of each suspension bolt in the target suspension system under various preset working condition loads is first determined by simulation software, and then the tangential resultant force of each suspension bolt is calculated based on the support reaction force of each suspension bolt, and then the rated tangential friction force of each suspension bolt in the target suspension system that can withstand various preset working condition loads is evaluated from the perspective of the slip safety factor based on the tangential resultant force of each suspension bolt, and finally the assembly parameters of each suspension bolt in the target suspension system are obtained based on the rated tangential friction force of the suspension bolt. The evaluation device for the assembly parameters of the suspension bolts of the present invention evaluates the assembly parameters of each suspension bolt in the target suspension system from the perspective of the slip safety factor on the basis of the support reaction force of each suspension bolt determined by simulation means, and the obtained assembly parameters of the suspension bolts are more accurate and appropriate, which can withstand various preset working condition loads and will not be over-designed, thereby alleviating the technical problem that the prior art cannot evaluate and obtain accurate assembly parameters of the suspension bolts.

[0164] Optionally, the first determination unit is also used to: input parameter information of the target suspension system in the first simulation software to construct a rigid body model of the target suspension system in the first simulation software; apply various preset working loads to the rigid body model, and then obtain the forces of each suspension under various preset working loads.

[0165] Optionally, the target suspension system includes: a target device, a suspension and suspension bolts for fixing the suspension to the target device, and the second determination unit is further used to: construct a finite element model of the target suspension system through a second simulation software, wherein in the finite element model, each suspension bolt is simulated by a beam unit; apply forces under each preset working condition load to each suspension in the finite element model, and extract the support reaction forces of target nodes of each beam unit under each preset working condition load, thereby obtaining the support reaction forces of each suspension bolt corresponding to each suspension under each preset working condition load, wherein the target node is a node corresponding to the position of the contact surface between each suspension and the target device.

[0166] Optionally, the support reaction force includes: an axial support reaction force, a first tangential support reaction force perpendicular to the axial support reaction force, and a second tangential support reaction force. The first calculation unit is further used to: calculate the tangential resultant force by the formula Calculate the tangential force of each suspension bolt, where F K represents the tangential force, RF 1 Represents the first tangential support reaction force, RF 2 Represents the second tangential support reaction force.

[0167] Optionally, the device is also used to: calculate the rated tangential friction force of the suspension bolt based on preset suspension bolt assembly parameters; calculate the slip safety factor of each suspension bolt according to the tangential resultant force of each suspension bolt and the rated tangential friction force of the suspension bolt; determine whether the slip safety factor of each suspension bolt meets preset conditions, wherein the preset condition is that the difference between the slip safety factor of each suspension bolt and the preset slip safety factor threshold is greater than a first preset threshold and less than a second preset threshold; if the preset conditions are met, the preset suspension bolt assembly parameters are used as the assembly parameters of each suspension bolt in the target suspension system; if the preset conditions are not met, the step of calculating the rated tangential friction force of the suspension bolt based on the preset slip safety factor threshold and the tangential resultant force of each suspension bolt is executed.

[0168] Optionally, the target suspension system includes: a target device, a suspension, and a suspension bolt for fixing the suspension to the target device, and the device is further used to: obtain the friction coefficient between the contact surfaces of each suspension and the target device; determine the discreteness corresponding to the tightening process based on the tightening process in the preset suspension bolt assembly parameters; determine the target minimum preload corresponding to the preset suspension bolt assembly parameters according to the preset suspension bolt assembly parameters and the preset preload database; calculate the rated tangential friction force according to the formula F KQerf =F M ·μ T k is used to calculate the rated tangential friction force of the suspension bolt, where F KQerf Indicates the rated tangential friction force of the suspension bolt, F MIndicates the target minimum preload force, μ T represents the friction coefficient and k represents the dispersion.

[0169] Optionally, the device is also used to: calculate the slip safety factor according to the formula Calculate the slip safety factor of each suspension bolt, where S G Indicates the slip safety factor of each suspension bolt, F KQerf Indicates the rated tangential friction force of the suspension bolt, F K Represents the tangential resultant force of each suspension bolt.

[0170] Optionally, the second calculation unit is also used to: determine the maximum tangential resultant force among the tangential resultant forces of each suspension bolt; calculate the sum of a preset slip safety factor threshold and a first preset threshold; multiply the calculated sum by the maximum tangential resultant force, and use the product result as the rated tangential friction force of the suspension bolt.

[0171] Optionally, the target suspension system includes: a target device, a suspension, and a suspension bolt for fixing the suspension to the target device, and the third determination unit is further used to: obtain the friction coefficient between the contact surfaces of each suspension and the target device, and obtain the discreteness corresponding to various tightening processes; calculate the minimum preload force according to the formula Calculate the minimum preload force of each suspension bolt in the target suspension system under each tightening process, where F M represents the minimum preload force of each suspension bolt in the target suspension system under each tightening process, F KQerf Indicates the rated tangential friction force of the suspension bolt, μ T represents the friction coefficient, k represents the discreteness corresponding to each tightening process; according to the minimum pre-tightening force of each suspension bolt in the target suspension system under each tightening process and a preset pre-tightening force database, the target suspension bolt assembly parameters corresponding to the minimum pre-tightening force of each suspension bolt in the target suspension system are determined; the target suspension bolt assembly parameters are used as the assembly parameters of each suspension bolt in the target suspension system.

[0172] Optionally, the device is also used to: determine the target preset working condition load among all preset working condition loads according to the forces of each suspension under various preset working condition loads; the second determination unit is also used to: determine the support reaction force of each suspension bolt corresponding to each suspension under each target preset working condition load through the second simulation software and the forces of each suspension under each target preset working condition load.

[0173] Optionally, the target suspension system includes at least: a range extender suspension system, a front drive suspension system and a rear drive suspension system.

[0174] The device provided in the embodiment of the present invention has the same implementation principle and technical effects as those of the aforementioned method embodiment. For the sake of brief description, for matters not mentioned in the device embodiment, reference may be made to the corresponding contents in the aforementioned method embodiment.

[0175] like Figure 8 As shown, an electronic device 600 provided in an embodiment of the present application includes: a processor 601, a memory 602 and a bus, wherein the memory 602 stores machine-readable instructions executable by the processor 601. When the electronic device is running, the processor 601 communicates with the memory 602 through the bus, and the processor 601 executes the machine-readable instructions to perform the steps of the above-mentioned method for evaluating the suspension bolt assembly parameters.

[0176] Specifically, the memory 602 and the processor 601 can be general-purpose memories and processors, which are not specifically limited here. When the processor 601 runs the computer program stored in the memory 602, the method for evaluating the assembly parameters of the suspension bolt can be executed.

[0177] The processor 601 may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method can be completed by the hardware integrated logic circuit or software instructions in the processor 601. The above processor 601 can be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it can also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components. The methods, steps and logic block diagrams disclosed in the embodiments of the present application can be implemented or executed. The general processor can be a microprocessor or the processor can also be any conventional processor, etc. The steps of the method disclosed in the embodiments of the present application can be directly embodied as a hardware decoding processor for execution, or a combination of hardware and software modules in the decoding processor for execution. The software module may be located in a storage medium mature in the art such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory, or an electrically erasable programmable memory, a register, etc. The storage medium is located in the memory 602, and the processor 601 reads the information in the memory 602 and completes the steps of the above method in combination with its hardware.

[0178] Corresponding to the above-mentioned method for evaluating the assembly parameters of the suspension bolts, an embodiment of the present application also provides a computer-readable storage medium, which stores machine-executable instructions. When the computer-executable instructions are called and executed by a processor, the computer-executable instructions prompt the processor to execute the steps of the above-mentioned method for evaluating the assembly parameters of the suspension bolts.

[0179] The evaluation device for the assembly parameters of the suspension bolts provided in the embodiment of the present application can be specific hardware on the device or software or firmware installed on the device. The implementation principle and technical effects of the device provided in the embodiment of the present application are the same as those of the aforementioned method embodiment. For the sake of brief description, the parts not mentioned in the device embodiment can refer to the corresponding contents in the aforementioned method embodiment. Technical personnel in the relevant field can clearly understand that for the convenience and simplicity of description, the specific working processes of the systems, devices and units described above can all refer to the corresponding processes in the aforementioned method embodiment, and will not be repeated here.

[0180] In the embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some communication interfaces, and the indirect coupling or communication connection of the devices or units can be electrical, mechanical or other forms.

[0181] For another example, the flowchart and block diagram in the accompanying drawings show the possible architecture, function and operation of the device, method and computer program product according to multiple embodiments of the present application. In this regard, each box in the flowchart or block diagram can represent a module, a program segment or a part of the code, and the module, the program segment or a part of the code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in a different order from the order marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or the flowchart, and the combination of the boxes in the block diagram and / or the flowchart can be implemented with a dedicated hardware-based system that performs a specified function or action, or can be implemented with a combination of dedicated hardware and computer instructions.

[0182] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0183] In addition, each functional unit in the embodiments provided in the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0184] If the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application can essentially or partly contribute to the prior art or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium, including a number of instructions for an electronic device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of the vehicle marking method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), disk or optical disk, and other media that can store program codes.

[0185] It should be noted that similar numbers and letters represent similar items in the following figures. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description and are not to be understood as indicating or implying relative importance.

[0186] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present application, which are used to illustrate the technical solution of the present application, rather than to limit it. The protection scope of the present application is not limited thereto. Although the present application is described in detail with reference to the aforementioned embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solution recorded in the aforementioned embodiments within the technical scope disclosed in the present application, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiment of the present application. They should all be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. An evaluation method for the assembly parameters of suspension bolts, characterized in that, it includes: Determine the forces on each mount in the target suspension system under various preset working condition loads through a first simulation software; Determine the reaction forces of each suspension bolt corresponding to each mount under each preset working condition load through a second simulation software and the forces on each mount under each preset working condition load; Calculate the tangential resultant force of each suspension bolt based on the reaction forces of each suspension bolt; Calculate the rated tangential friction force of the suspension bolts based on a preset slip safety factor threshold and the tangential resultant force of each suspension bolt; Determine the assembly parameters of each suspension bolt in the target suspension system based on the rated tangential friction force of the suspension bolts; Wherein, the reaction forces include: axial reaction force, a first tangential reaction force perpendicular to the axial reaction force, and a second tangential reaction force. Calculating the tangential resultant force of each suspension bolt based on the reaction forces of each suspension bolt includes: Tangential resultant force calculation formula Calculate the tangential resultant force of each of the suspension bolts, where represents the tangential resultant force represents the first tangential reaction force represents the second tangential reaction force; Wherein, calculating the rated tangential friction force of the suspension bolts based on a preset slip safety factor threshold and the tangential resultant force of each suspension bolt includes: Determine the maximum tangential resultant force among the tangential resultant forces of each suspension bolt; Calculate the sum of the preset slip safety factor threshold and a first preset threshold; Perform a multiplication operation on the calculated sum and the maximum tangential resultant force, and use the result of the multiplication operation as the rated tangential friction force of the suspension bolts.

2. The method according to claim 1, characterized in that, Determining the forces on each mount in the target suspension system under various preset working condition loads through a first simulation software includes: Input the parameter information of the target suspension system into the first simulation software to construct a rigid body model of the target suspension system in the first simulation software; Apply the various preset working condition loads to the rigid body model, and then obtain the forces on each mount under various preset working condition loads.

3. The method according to claim 1, characterized in that, The target suspension system includes: a target device, mounts, and suspension bolts for fixing the mounts to the target device. Determining the reaction forces of each suspension bolt corresponding to each mount under each preset working condition load through a second simulation software and the forces on each mount under each preset working condition load includes: Construct a finite element model of the target suspension system through a second simulation software. In the finite element model, each suspension bolt is simulated by a beam element; Apply the forces on each mount under each preset working condition load to the mounts in the finite element model, and extract the reaction forces of the target nodes of each beam element under each preset working condition load, and then obtain the reaction forces of each suspension bolt corresponding to each mount under each preset working condition load. Wherein, the target nodes are the nodes corresponding to the positions of the contact surfaces between each mount and the target device.

4. The method according to claim 1, characterized in that, After calculating the tangential resultant force of each suspension bolt based on the reaction forces of the respective suspension bolts, before calculating the rated tangential friction force of the suspension bolts based on a preset slip safety factor threshold and the tangential resultant force of the respective suspension bolts, the method further includes: Calculating the rated tangential friction force of the suspension bolts based on preset suspension bolt assembly parameters; Calculating the slip safety factor of each suspension bolt according to the tangential resultant force of each suspension bolt and the rated tangential friction force of the suspension bolt; Determining whether the slip safety factors of the respective suspension bolts meet a preset condition, where the preset condition is that the difference between the slip safety factor of each suspension bolt and the preset slip safety factor threshold is greater than a first preset threshold and less than a second preset threshold; If the preset condition is met, using the preset suspension bolt assembly parameters as the assembly parameters of each suspension bolt in the target suspension system; If the preset condition is not met, performing the step of calculating the rated tangential friction force of the suspension bolts based on the preset slip safety factor threshold and the tangential resultant force of the respective suspension bolts.

5. The method according to claim 4, wherein, The target suspension system includes: a target device, a suspension, and suspension bolts for fixing the suspension to the target device. Calculating the rated tangential friction force of the suspension bolts based on preset suspension bolt assembly parameters includes: Obtaining the friction coefficient between the contact surfaces of the respective suspensions and the target device; Determining the dispersion corresponding to the tightening process based on the tightening process in the preset suspension bolt assembly parameters; Determining the target minimum pre-tightening force corresponding to the preset suspension bolt assembly parameters according to the preset suspension bolt assembly parameters and a preset pre-tightening force database; According to the rated tangential friction force calculation formula Calculate the rated tangential friction force of the suspension bolt, where represents the rated tangential friction force of the suspension bolt, represents the target minimum pre-tightening force, represents the friction coefficient, represents the dispersion degree.

6. The method according to claim 4, wherein, Calculating the slip safety factor of each suspension bolt according to the tangential resultant force of each suspension bolt and the rated tangential friction force of the suspension bolt includes: According to the calculation formula of the slip safety factor Calculate the slip safety factor of each of the suspension bolts, where represents the slip safety factor of each of the suspension bolts, represents the rated tangential frictional force of the suspension bolts, represents the tangential resultant force of each of the suspension bolts.

7. The method according to claim 1, wherein, The target suspension system includes: a target device, a suspension, and suspension bolts for fixing the suspension to the target device. Determining the assembly parameters of each suspension bolt in the target suspension system based on the rated tangential friction force of the suspension bolts includes: Obtaining the friction coefficient between the contact surfaces of the respective suspensions and the target device, and obtaining the dispersion corresponding to various tightening processes; According to the minimum pre-tightening force calculation formula Calculate the minimum pre-tightening force of each suspension bolt in the target suspension system under each tightening process, where represents the minimum pre-tightening force of each suspension bolt in the target suspension system under each tightening process, represents the rated tangential friction force of the suspension bolt, represents the friction coefficient, represents the dispersion corresponding to each tightening process; Determining the target suspension bolt assembly parameters corresponding to the minimum pre-tightening force of each suspension bolt in the target suspension system under each tightening process according to the minimum pre-tightening force of each suspension bolt in the target suspension system under each tightening process and a preset pre-tightening force database; Using the target suspension bolt assembly parameters as the assembly parameters of each suspension bolt in the target suspension system.

8. The method according to claim 1, wherein, After determining the forces on each suspension in the target suspension system under various preset working condition loads through a first simulation software, the method further includes: Determining a target preset working condition load among all the preset working condition loads according to the forces on each suspension under the various preset working condition loads; Determine the reaction forces of the respective mounting bolts corresponding to the respective mounts under each preset operating condition load through the second simulation software and the forces on the respective mounts under each preset operating condition load, including: determining the reaction forces of the respective mounting bolts corresponding to the respective mounts under each target preset operating condition load through the second simulation software and the forces on the respective mounts under each target preset operating condition load.

9. The method according to claim 1, wherein, the target mount system at least includes: an extender mount system, a front-drive mount system, and a rear-drive mount system.

10. An evaluation device for mounting bolt assembly parameters, wherein, it includes: a first determination unit for determining the forces on the respective mounts in the target mount system under various preset operating condition loads through the first simulation software; a second determination unit for determining the reaction forces of the respective mounting bolts corresponding to the respective mounts under each preset operating condition load through the second simulation software and the forces on the respective mounts under each preset operating condition load; a first calculation unit for calculating the tangential resultant force of the respective mounting bolts based on the reaction forces of the respective mounting bolts; a second calculation unit for calculating the rated tangential friction force of the mounting bolts based on a preset slip safety factor threshold and the tangential resultant force of the respective mounting bolts; a third determination unit for determining the assembly parameters of the respective mounting bolts in the target mount system based on the rated tangential friction force of the mounting bolts; Among them, the reaction forces include: an axial reaction force, a first tangential reaction force perpendicular to the axial reaction force, and a second tangential reaction force. The first calculation unit is further configured to: through a tangential resultant force calculation formula calculate the tangential resultant force of each suspension bolt, where represents the tangential resultant force, represents the first tangential reaction force, represents the second tangential reaction force; wherein, the second calculation unit is further configured to: determine the maximum tangential resultant force among the tangential resultant forces of the respective mounting bolts; calculate the sum of the preset slip safety factor threshold and a first preset threshold; perform a multiplication operation on the calculated sum and the maximum tangential resultant force, and use the result of the multiplication operation as the rated tangential friction force of the mounting bolts.

11. An electronic device, including a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein, when the processor executes the computer program, the steps of the method according to any one of claims 1 to 9 are implemented.

12. A computer-readable storage medium, wherein, the computer-readable storage medium stores machine-executable instructions, and when the machine-executable instructions are called and executed by the processor, the machine-executable instructions cause the processor to execute the method according to any one of claims 1 to 9.

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