Method and device for evaluating vehicle structure

Abstract

The invention discloses a method and device for evaluating a vehicle structure. And road surface data are obtained based on vehicle information, vehicle speed, working conditions and road surface grades, a whole vehicle model is established based on structure information and evaluation content, and the road surface data are applied to a tire grounding point simulated by the whole vehicle model to obtain a vehicle model with road surface excitation. And obtaining a calculation result of the to-be-evaluated parameter of each node in the vehicle model, calculating and judging whether the evaluation parameter meets a preset standard based on the preset evaluation parameter and the calculation result, and if not, adjusting the structure information until the preset standard is met. The method supports the evaluation of the structure of the vehicle based on the vehicle information, the structure information and the evaluation content, and achieves the effects of shortening the development period and improving the development efficiency. Meanwhile, the method does not depend on commercial modeling software, special software for vehicle types is developed independently, and the cost is reduced.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to a method and device for evaluating a vehicle structure. Background Art

[0002] As competition in the automotive market intensifies, the development cycle of new models of various automakers is getting shorter and shorter, while the requirements for automotive performance are getting higher and higher. With the shortened development cycle of automotive parts, forward guidance of the automotive architecture through simulation can effectively improve development efficiency and ensure automotive performance. For example, the noise of new energy vehicles mainly comes from road noise and wind noise. After correctly adjusting the vehicle architecture, it will play a certain role in isolating road noise.

[0003] In the existing technology, there are commonly used modeling software such as Adams, Carsim and Matlab in the automotive industry, but these commercial software models are charged and the principles of the modules are unknown. Therefore, how to evaluate the vehicle structure for the model without relying on commercial software to improve vehicle performance and development efficiency. Summary of the invention

[0004] Based on the above problems, the present application provides a method and device for evaluating vehicle structure, so as to evaluate the vehicle structure for each vehicle model without relying on commercial software, so as to improve vehicle performance and development efficiency.

[0005] The present application discloses a method for evaluating a vehicle structure, the method comprising:

[0006] Obtain road surface data based on vehicle information, vehicle speed, working conditions and road surface grade;

[0007] Build a vehicle model based on structural information and evaluation content;

[0008] Applying the road surface data to the tire contact point simulated by the whole vehicle model to obtain a vehicle model with road surface excitation;

[0009] Obtaining calculation results of parameters to be evaluated for each node in the vehicle model;

[0010] Calculating the evaluation parameter based on the preset evaluation parameter and the calculation result;

[0011] Determining whether the evaluation parameters meet preset standards;

[0012] If yes, output the structural information;

[0013] If not, the structural information is adjusted until the preset standard is met.

[0014] Optionally, the acquiring of road surface data based on vehicle information, vehicle speed, operating conditions and road surface grade includes:

[0015] A road spectrum is collected based on the working condition and the road surface grade to obtain road surface data, or a virtual road spectrum is generated based on the vehicle information, the vehicle speed, the working condition and the road surface grade to obtain road surface data.

[0016] Optionally, a vehicle model is built based on the structural information, including:

[0017] Suspension modeling and body modeling based on structural information;

[0018] The suspension model obtained by the suspension modeling and the body model obtained by the body modeling are connected to establish the whole vehicle model.

[0019] Optionally, the performing suspension modeling based on the structural information includes:

[0020] Using the subframe structure and bushing parameters in the structural information as input parameters, creating a structural unit of the suspension;

[0021] Based on the structural units of the suspension, a connection grid is created to obtain the suspension model; the connection grid includes a spring damping unit, a concentrated mass unit and a rigid unit.

[0022] Optionally, the vehicle body modeling includes simplified vehicle body modeling and complex vehicle body modeling, and the vehicle body modeling is performed based on the structural information, including:

[0023] Perform simplified modeling of the vehicle body using the concentrated mass unit and the rigid unit model;

[0024] Using the body hard points, body weight and body stiffness in the structural information as input parameters, creating a structural unit of the body;

[0025] Calculating material properties of the vehicle body based on preset parameters and a cross-sectional shape and a cross-sectional area of ​​a structural unit of the vehicle body;

[0026] The material properties are assigned to the structural units of the vehicle body to perform complex modeling of the vehicle body.

[0027] Optionally, build a complete vehicle model based on the evaluation content, including:

[0028] When the evaluation content is for the front subframe structure, a vehicle model including the front suspension is established, or a vehicle model including the front suspension, rear suspension and body is established;

[0029] When the evaluation content is for the rear subframe structure, a vehicle model including the rear suspension is established, or a vehicle model including the front suspension, rear suspension and body is established;

[0030] When the evaluation content is aimed at the front subframe structure and the rear frame structure, a whole vehicle model including the front suspension, rear suspension and body is established, or a whole vehicle model including the front suspension and a whole vehicle model including the rear suspension are established separately.

[0031] Optionally, obtaining the calculation result of the parameter to be evaluated of each node in the vehicle model includes:

[0032] The parameters to be evaluated of each node in the vehicle model are calculated using a transient response analysis direct method or a modal method to obtain the calculation result.

[0033] Optionally, the calculating the evaluation parameter based on the preset evaluation parameter and the calculation result includes:

[0034] Acquire the preset evaluation parameter corresponding to the working condition;

[0035] The preset evaluation parameter is compared with the calculation result to obtain the evaluation parameter.

[0036] Optionally, the adjusting the structural information includes:

[0037] adjusting the bushing parameters, and obtaining adjusted evaluation parameters according to the adjusted bushing parameters;

[0038] When the adjusted evaluation parameter still does not meet the preset standard, the subframe structure is adjusted.

[0039] Based on the above method for evaluating vehicle structure, the present application also discloses a device for evaluating vehicle structure, including: a road surface data acquisition unit, a whole vehicle model establishment unit, a vehicle model establishment unit, a calculation unit, an evaluation unit, a judgment unit, an output unit and an adjustment unit;

[0040] The road surface data acquisition unit is used to acquire road surface data based on vehicle information, vehicle speed, working conditions and road surface grade;

[0041] The whole vehicle model building unit is used to build a whole vehicle model based on the structural information and the evaluation content;

[0042] The vehicle model building unit is used to apply the road surface data to the tire contact points simulated by the whole vehicle model to obtain a vehicle model with road surface excitation;

[0043] The calculation unit is used to obtain the calculation results of the parameters to be evaluated of each node in the vehicle model;

[0044] The evaluation unit is used to calculate the evaluation parameter based on the preset evaluation parameter and the calculation result;

[0045] The judging unit is used to judge whether the evaluation parameter meets the preset standard;

[0046] The output unit is used to output the structural information;

[0047] The adjustment unit is used to adjust the structural information until the preset standard is met.

[0048] Optionally, the road surface data acquisition unit is used to:

[0049] A road spectrum is collected based on the working condition and the road surface grade to obtain road surface data, or a virtual road spectrum is generated based on the vehicle information, the vehicle speed, the working condition and the road surface grade to obtain road surface data.

[0050] Optionally, the vehicle model building unit includes:

[0051] A suspension and body modeling subunit, for performing suspension modeling and body modeling based on structural information;

[0052] The whole vehicle modeling subunit is used to connect the suspension model obtained by the suspension modeling and the body model obtained by the body modeling to establish the whole vehicle model.

[0053] Optionally, the suspension and body modeling subunit includes:

[0054] A suspension structure creation subunit, used to take the subframe structure and bushing parameters in the structure information as input parameters to create a structure unit of the suspension;

[0055] The connection grid creation subunit is used to create a connection grid based on the structural unit of the suspension to obtain the suspension model; the connection grid includes a spring damping unit, a concentrated mass unit and a rigid unit.

[0056] Optionally, the body modeling includes simplified body modeling and complex body modeling, and the suspension and body modeling subunits include:

[0057] A vehicle body simplified modeling subunit, used for performing simplified modeling of the vehicle body using the concentrated mass unit and the rigid unit model;

[0058] A body structure creation subunit, used to take body hard points, body weight and body stiffness in the structure information as input parameters to create a structural unit of the body;

[0059] A material property calculation subunit, used to calculate the material properties of the vehicle body based on preset parameters and the cross-sectional shape and cross-sectional area of ​​the structural unit of the vehicle body;

[0060] The vehicle body complex modeling subunit is used to assign the material properties to the structural units of the vehicle body to perform complex modeling of the vehicle body.

[0061] Optionally, the vehicle model building unit includes:

[0062] The front subframe is a subunit, which is used to establish a vehicle model including the front suspension, or a vehicle model including the front suspension, rear suspension and body when the evaluation content is for the front subframe structure;

[0063] The rear subframe is a subunit that is used to build a vehicle model including the rear suspension, or a vehicle model including the front suspension, rear suspension and body when the evaluation content is for the rear subframe structure;

[0064] The double subframe is a sub-unit, and is used to establish a whole vehicle model including the front suspension, rear suspension and body when the evaluation content is aimed at the front subframe structure and the rear frame structure, or to establish a whole vehicle model including the front suspension and a whole vehicle model including the rear suspension respectively.

[0065] Optionally, the computing unit is used to:

[0066] The parameters to be evaluated of each node in the vehicle model are calculated using a transient response analysis direct method or a modal method to obtain the calculation result.

[0067] Optionally, the evaluation unit comprises:

[0068] A preset evaluation parameter acquisition subunit, used to acquire the preset evaluation parameter corresponding to the working condition;

[0069] The comparison subunit is used to compare the preset evaluation parameter with the calculation result to obtain the evaluation parameter.

[0070] Optionally, the adjustment unit includes:

[0071] A bushing parameter adjustment subunit, used for adjusting the bushing parameters and obtaining adjusted evaluation parameters according to the adjusted bushing parameters;

[0072] The subframe adjustment subunit is used to adjust the subframe structure when the adjusted evaluation parameter still does not meet the preset standard.

[0073] The present application discloses a method and device for evaluating vehicle structure. According to the road surface data obtained based on vehicle information, vehicle speed, working condition and road surface grade, a whole vehicle model is established based on the structural information and evaluation content, and the road surface data is applied to the tire contact point simulated by the whole vehicle model to obtain a vehicle model with road surface excitation. The calculation results of the parameters to be evaluated for each node in the vehicle model are obtained, and based on the preset evaluation parameters and the calculation results, the evaluation parameters are calculated and judged whether they meet the preset standards. If not, the structural information is adjusted until the preset standards are met. Supporting the evaluation of the vehicle structure based on vehicle information, structural information and evaluation content plays a role in shortening the development cycle and improving development efficiency. At the same time, it does not rely on commercial modeling software, and independently develops special software for vehicle models (vehicle structural information, such as frame structure), which reduces costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0074] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0075] Figure 1 A schematic flow chart of a method for evaluating a vehicle structure disclosed in an embodiment of the present application;

[0076] Figure 2 A schematic diagram of a vehicle model disclosed in an embodiment of the present application;

[0077] Figure 3 It is a schematic diagram of a four-link rear suspension model disclosed in an embodiment of the present application;

[0078] Figure 4 A schematic diagram of a rear subframe model established for a circular cross-section beam unit disclosed in an embodiment of the present application;

[0079] Figure 5 A schematic diagram of a rear subframe model established for a rectangular cross-section beam unit disclosed in an embodiment of the present application;

[0080] Figure 6 A schematic diagram of the structure of a device for evaluating vehicle structure disclosed in an embodiment of the present application. DETAILED DESCRIPTION

[0081] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0082] Embodiment 1: This application discloses a method for evaluating a vehicle structure.

[0083] For details, please refer to Figure 1 A method for evaluating a vehicle structure disclosed in this embodiment includes the following steps:

[0084] Step 101: Obtain road surface data based on vehicle information, vehicle speed, operating conditions and road surface grade.

[0085] In the method described in this embodiment, as an optional method, road spectrum collection is performed based on working conditions and road surface grades to obtain road surface data. The working conditions may include performance evaluation conditions such as smoothness evaluation conditions, handling stability evaluation conditions, and vehicle warm-up NVH evaluation conditions. Among them, smoothness evaluation conditions and NVH evaluation conditions may include road surface random vibration response and pulse response tests, etc., and handling stability evaluation conditions may include steering characteristics tests, transient yaw response, and steering wheel angle pulse tests. As an optional method, the road surface grade may adopt the eight-level classification standards of A, B, C, D, E, F, G, and H in the national standard GB / T7031-2005.

[0086] In the method described in this embodiment, the road spectrum acquisition is to make the test vehicle drive on roads of different road grades according to different working conditions to collect real-time data. Among them, the road surface excitation time domain displacement in the X, Y and Z directions of each wheel tire contact point can be collected as road surface data through the equipment installed on the tire.

[0087] As another optional method, a virtual road spectrum is generated based on vehicle information, vehicle speed, working condition and road surface grade to obtain road surface data. The vehicle information includes wheelbase and track width.

[0088] Based on vehicle information, vehicle speed, working condition and road surface grade, trigonometric functions are used to simulate the road surface excitation time domain displacements in the X, Y and Z directions of each wheel tire contact point based on different working conditions, which are used to simulate road surface undulation, body roll and body yaw. Among them, the Z-direction road surface unevenness time domain displacement of each wheel tire contact point can be simulated and generated by filtering white noise method, integral white noise method, trigonometric series method or AR (ARMA) method to simulate the uneven road surface. Among them, the Z-direction road surface unevenness time domain displacement of the contact point and the Z-direction road surface excitation time domain displacement of the contact point can also be superimposed to obtain the final road surface excitation time domain displacement, which can more accurately simulate the actual road surface state with uneven road surface and road surface undulation. The X-direction, Y-direction and Z-direction road surface excitation time domain displacements of each wheel tire contact point generated by the above method are road surface data.

[0089] Step 102: Establish a vehicle model based on the structural information and the evaluation content.

[0090] In the method described in this embodiment, the suspension modeling is first performed based on the structural information, and the subframe structure and bushing parameters in the structural information are used as input parameters to create the structural unit of the suspension.

[0091] As an optional method, the subframe structure includes the suspension type, subframe and swing arm structure, etc., and the bushing parameters include hard points, weight and stiffness, etc. Among them, the subframe structure has various structural forms, such as bushing on longitudinal beams, bushing on cross beams, double longitudinal beams and double rear cross beams. The overall structure of the subframe and swing arm structure has various structural forms, such as torsion beam, three-link, four-link, integrated four-link, five-link and double wishbone. The swing arm structure has various structural forms, such as two-force bar, spring arm, swing arm with shock absorber, stabilizer bar mounting point, etc.

[0092] In the method described in this embodiment, after the above parameters are input, the structural unit is created. As an optional method, the suspension modeling uses beam units or shell units to simulate structures such as subframes, swing arms, wheel brackets and front steering knuckles. Among them, when modeling the suspension, the beam unit can be used more to simulate the parts, and the shell unit is used to simulate the parts only when the structure uses a large area of ​​stamping plates. Among them, the cross-section of the beam unit can be selected into shapes such as circular, square and rectangular as needed.

[0093] Among them, the material properties of beam elements and shell elements are calculated material properties. The calculated material properties are calculated based on the weight and stiffness targets, the cross-sectional shape and area of ​​the beam element or the area of ​​the shell element, including the density, elastic modulus, and thickness of the shell element. When modeling the suspension, the calculated material properties can be assigned to the beam elements and shell elements to simulate their materials.

[0094] In the method described in this embodiment, a suspension model can be obtained by creating a connection grid based on the structural unit of the suspension. The connection grid includes spring damping units that simulate parameters such as bushings, shock absorbers, springs and tires, concentrated mass units that simulate wheel brackets, brake calipers, etc. that do not require specific modeling, and rigid units that connect various parts. The front suspension model and the rear suspension model can be established through suspension modeling.

[0095] In the method described in this embodiment, body modeling is performed based on structural information and a suspension model. Body modeling is divided into simplified body modeling and complex body modeling. When performing simplified body modeling, the modeling can be completed using concentrated mass units and rigid unit models. When performing complex body modeling, the body hard points, body weight, and body stiffness in the structural information are used as input parameters to create the structural units of the body. Based on preset parameters and the cross-sectional shape and cross-sectional area of ​​the structural units of the body, material properties such as density and elastic modulus of the body are calculated. The material properties are then assigned to the structural units of the body to perform complex body modeling.

[0096] In the method described in this embodiment, a front suspension model and a rear suspension model obtained by suspension modeling and a body model obtained by body modeling are connected using rigid units to establish a whole vehicle model.

[0097] In the method described in this embodiment, the whole vehicle model can be established in a targeted manner according to the evaluation content. When the evaluation content is for the front subframe structure, a whole vehicle model including the front suspension is established, or a whole vehicle model including the front suspension, rear suspension and body is established. When the evaluation content is for the rear subframe structure, a whole vehicle model including the rear suspension is established, or a whole vehicle model including the front suspension, rear suspension and body is established. When the evaluation content is for the front subframe structure and the rear frame structure, a whole vehicle model including the front suspension, rear suspension and body is established, or a whole vehicle model including the front suspension and a whole vehicle model including the rear suspension are established respectively.

[0098] Step 103: applying the road surface data to the tire contact points simulated by the whole vehicle model to obtain a vehicle model with road surface excitation.

[0099] The road surface data may be in the form of displacement, velocity, force, acceleration, etc. In the method described in this embodiment, a vehicle model with road surface excitation is established by applying the road surface data to the contact point between the tire and the road surface simulated by the spring damping unit. As an optional method, the road surface data application method is to use the forced motion large mass method, the large stiffness method, the direct method or the Lagrange multiplier method.

[0100] Step 104: Obtain calculation results of the parameters to be evaluated for each node in the vehicle model.

[0101] In the method described in this embodiment, the transient response analysis direct method or the modal method is used to calculate and obtain the parameters to be evaluated (such as displacement, velocity and acceleration) of each node in the vehicle model to obtain the calculation result. As an optional method, the calculation result can be further filtered to remove noise, so as to obtain a more accurate result that is closer to the actual situation.

[0102] Step 105: Calculate the evaluation parameter based on the preset evaluation parameter and the calculation result.

[0103] In the method described in this embodiment, the preset evaluation parameters corresponding to the working conditions are obtained, and the preset evaluation parameters are compared with the calculation results to obtain the evaluation parameters. As an optional method, the evaluation standards required by the enterprise standards, national standards or international standards corresponding to the working conditions can be used as preset evaluation parameters, and then combined with the calculation results, the evaluation parameters are calculated by comparison and programming. For example, the calculation results obtained are A and B. According to the required working conditions, the evaluation parameters corresponding to A and B are searched in the enterprise standards, national standards or international standards (equivalent to the preset evaluation parameter table for the calculation results) to obtain a single evaluation parameter.

[0104] Step 106: Determine whether the evaluation parameter meets the preset standard. If yes, proceed to step 107. If no, proceed to step 108.

[0105] In the method described in this embodiment, the preset standard is the range required by the enterprise standard, national standard or international standard. When the evaluation parameter is within the range, it is judged that the evaluation parameter meets the preset standard, and when the evaluation parameter is not within the range, it is judged that the evaluation parameter does not meet the preset standard. For example, the evaluation parameter is 5, and according to the required working conditions, the preset standard range is searched in the enterprise standard, national standard or international standard, and the obtained range is 6 to 10, then the evaluation parameter is not within the range, that is, it does not meet the preset standard.

[0106] Step 107: Output the structural information.

[0107] In the method described in this embodiment, when the evaluation parameters meet the preset standards, the structural information is output, including the subframe structure and bushing parameters, to complete the evaluation of the vehicle structure.

[0108] Step 108: Adjust the structural information until the preset standard is met.

[0109] In the method described in this embodiment, the bushing parameters in the structural information are first adjusted. The bushing is a subframe bushing or a swing arm bushing, which includes static stiffness and damping in the X, Y and Z directions. According to the adjusted bushing parameters, the whole vehicle model establishment step is returned to remodel and perform subsequent steps to obtain adjusted evaluation parameters. It is again determined whether the adjusted evaluation parameters meet the preset standards.

[0110] In the method described in this embodiment, when the adjusted evaluation parameters still do not meet the preset standards, the subframe structure is adjusted. The subframe structure includes a structure of a crossbeam and a longitudinal beam, such as a double rear crossbeam, a double longitudinal beam, etc. The subframe structure also includes a lap joint, such as a bushing arranged on a crossbeam, a bushing arranged on a longitudinal beam, etc. According to the adjusted subframe structure, the whole vehicle model establishment step is returned to, the model is re-established, and subsequent steps are performed to obtain the adjusted evaluation parameters. Until the adjusted evaluation parameters meet the preset standards.

[0111] The method described in this embodiment can model the whole vehicle based on structural information, does not rely on commercial modeling software, and can establish a special model for the vehicle model (vehicle structural information, such as frame structure). While reducing costs, it realizes the improvement of software usage rights, and is no longer limited to the use of modules that come with commercial software. The method described in this embodiment can also perform targeted modeling based on the evaluation content. For vehicle structures that do not need to be evaluated, their models do not need to be established, which improves flexibility and makes the evaluation more efficient and time-saving. The entire method evaluates the structure of the vehicle based on vehicle information, structural information and evaluation content, which plays a role in shortening the development cycle and improving development efficiency. In addition, there are simple modeling and complex modeling operations, which are more flexible and targeted.

[0112] Embodiment 2: In a method for evaluating vehicle structure disclosed in the present application, it is necessary to establish a whole vehicle model. When modeling the whole vehicle, it is necessary to collect structural information (including suspension type, structure of subframe and swing arm) and bushing parameters (including hard points, weight, stiffness, and damping of the object to be modeled). Among them, suspension types include McPherson suspension, double wishbone suspension, torsion beam suspension, three-link suspension, four-link suspension, integrated four-link suspension, and five-link suspension. The swing arm structure has the form of a two-force bar, a spring mounting point, a shock absorber mounting point, and a stabilizer bar connecting rod mounting point.

[0113] Figure 2 is a schematic diagram of the vehicle model, such as Figure 2 As shown: the left side of the figure is the front suspension, the middle side is the vehicle body, and the right side is the rear suspension. In the structural information, the subframe includes the front subframe 201 and the rear subframe 301. The swing arm includes the front swing arm 202, the first rear swing arm 302, the second rear swing arm 303, the third rear swing arm 304, the fourth rear swing arm 305, and the fifth rear swing arm 306. In the bushing parameters, the hard points include the front suspension hard point d2, the rear suspension hard point d3, and the vehicle body mass center point dx The weight is the weight of each part of the front suspension, the weight of each part of the rear suspension and the total weight of the vehicle body. The stiffness is the target stiffness of each part of the front suspension, the target stiffness of each part of the rear suspension, the stiffness of the bushing, the stiffness of the front shock absorber 204, the stiffness of the rear shock absorber 308 and the spring ( Figure 2 is blocked in Figure 3 The damping is the damping of the bushing, the damping of the shock absorber 307 and the damping of the shock absorber 308.

[0114] Figure 3 Schematic diagram of the four-link rear suspension model disclosed in the embodiment of this application. Figure 3 As shown:

[0115] The rear suspension model includes a rear subframe 301, a first rear swing arm 302, a second rear swing arm 303, a third rear swing arm 304, a fourth rear swing arm 305 and a fifth rear swing arm ( Figure 3 The rear wheel support 309 is also provided with a rear shock absorber 308, a rear wheel support 309 (connected with the rear wheel) and a spring 310.

[0116] When modeling the suspension, use beam elements or shell elements to simulate structures such as subframes, swing arms, wheel brackets, and steering knuckles. As an optional method, use beam elements to simulate parts when modeling the suspension, and use shell elements only when the structure uses a large area of ​​stamping plates. For example, the shaded part of the left front suspension in the figure is simulated by shell elements.

[0117] In the method described in this embodiment, the cross section of the beam unit can be in various shapes such as circular, square and rectangular as required. Figure 4 Schematic diagram of the rear subframe model built with circular cross-section beam elements, and Figure 5 The schematic diagram of the rear subframe model established with rectangular cross-section beam elements is shown in the figure.

[0118] In the method described in this embodiment, suspension modeling requires the creation of a connected mesh, which includes spring-damping units that simulate parameters such as bushings, shock absorbers, springs, tires, etc., concentrated mass units that simulate wheel brackets, steering knuckles, brake calipers, etc. that do not require specific modeling, and rigid units that connect the various parts.

[0119] In the method described in this embodiment, when modeling the whole vehicle, targeted modeling can be performed according to the evaluation content. When evaluating the structural selection and bushing parameters of the front subframe, a front suspension model can be established separately, and the concentrated mass unit of the body is applied to the front suspension model. When evaluating the structural selection and bushing parameters of the rear subframe, a rear suspension model can be established separately, and the concentrated mass unit of the body is applied to the rear suspension model. This method can make the results accurate, the modeling workload is smaller, and the calculation efficiency is faster.

[0120] Based on the method for evaluating the vehicle structure disclosed in the above embodiment, this embodiment correspondingly discloses a device for evaluating the vehicle structure. Figure 6 , the device for evaluating vehicle structure comprises: a road surface data acquisition unit 601, a vehicle model establishment unit 602, a vehicle model establishment unit 603, a calculation unit 604, an evaluation unit 605, a judgment unit 606, an output unit 607 and an adjustment unit 608;

[0121] The road surface data acquisition unit 601 is used to acquire road surface data based on vehicle information, vehicle speed, working conditions and road surface grade;

[0122] The whole vehicle model building unit 602 is used to build a whole vehicle model based on the structural information and the evaluation content;

[0123] The vehicle model building unit 603 is used to apply the road surface data to the tire contact points simulated by the whole vehicle model to obtain a vehicle model with road surface excitation;

[0124] The calculation unit 604 is used to obtain the calculation results of the parameters to be evaluated of each node in the vehicle model;

[0125] The evaluation unit 605 is used to calculate the evaluation parameter based on the preset evaluation parameter and the calculation result;

[0126] The judging unit 606 is used to judge whether the evaluation parameter meets the preset standard;

[0127] The output unit 607 is used to output the structure information;

[0128] The adjusting unit 608 is used to adjust the structural information until the preset standard is met.

[0129] Optionally, the road surface data acquisition unit 601 is used to:

[0130] A road spectrum is collected based on the working condition and the road surface grade to obtain road surface data, or a virtual road spectrum is generated based on the vehicle information, the vehicle speed, the working condition and the road surface grade to obtain road surface data.

[0131] Optionally, the vehicle model building unit 602 includes:

[0132] A suspension and body modeling subunit, for performing suspension modeling and body modeling based on structural information;

[0133] The whole vehicle modeling subunit is used to connect the suspension model obtained by the suspension modeling and the body model obtained by the body modeling to establish the whole vehicle model.

[0134] Optionally, the suspension and body modeling subunit includes:

[0135] A suspension structure creation subunit, used to take the subframe structure and bushing parameters in the structure information as input parameters to create a structure unit of the suspension;

[0136] The connection grid creation subunit is used to create a connection grid based on the structural unit of the suspension to obtain the suspension model; the connection grid includes a spring damping unit, a concentrated mass unit and a rigid unit.

[0137] Optionally, the body modeling includes simplified body modeling and complex body modeling, and the suspension and body modeling subunits include:

[0138] A vehicle body simplified modeling subunit, used for performing simplified modeling of the vehicle body using the concentrated mass unit and the rigid unit model;

[0139] A body structure creation subunit, used for taking body hard points, body weight and body stiffness in the structure information as input parameters to create a structural unit of the body;

[0140] A material property calculation subunit, used to calculate the material properties of the vehicle body based on preset parameters and the cross-sectional shape and cross-sectional area of ​​the structural unit of the vehicle body;

[0141] The vehicle body complex modeling subunit is used to assign the material properties to the structural units of the vehicle body to perform complex modeling of the vehicle body.

[0142] Optionally, the vehicle model building unit 602 includes:

[0143] The front subframe is a subunit, which is used to establish a vehicle model including the front suspension, or a vehicle model including the front suspension, rear suspension and body when the evaluation content is for the front subframe structure;

[0144] The rear subframe is a subunit that is used to build a vehicle model including the rear suspension, or a vehicle model including the front suspension, rear suspension and body when the evaluation content is for the rear subframe structure;

[0145] The double subframe is a sub-unit, and is used to establish a whole vehicle model including the front suspension, rear suspension and body when the evaluation content is aimed at the front subframe structure and the rear frame structure, or to establish a whole vehicle model including the front suspension and a whole vehicle model including the rear suspension respectively.

[0146] Optionally, the computing unit 604 is configured to:

[0147] The parameters to be evaluated of each node in the vehicle model are calculated using a transient response analysis direct method or a modal method to obtain the calculation result.

[0148] Optionally, the evaluation unit 305 includes:

[0149] A preset evaluation parameter acquisition subunit, used to acquire the preset evaluation parameter corresponding to the working condition;

[0150] The comparison subunit is used to compare the preset evaluation parameter with the calculation result to obtain the evaluation parameter.

[0151] Optionally, the adjusting unit 608 includes:

[0152] A bushing parameter adjustment subunit, used for adjusting the bushing parameters and obtaining adjusted evaluation parameters according to the adjusted bushing parameters;

[0153] The subframe adjustment subunit is used to adjust the subframe structure when the adjusted evaluation parameter still does not meet the preset standard.

[0154] The embodiments in this specification are described in a progressive manner. As for the devices disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple, and the relevant parts can be referred to the description of the methods.

[0155] It should also be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0156] The steps of the method or algorithm described in conjunction with the embodiments disclosed herein may be implemented directly using hardware, a software module executed by a processor, or a combination of the two. The software module may be placed in a random access memory (RAM), a memory, a read-only memory (ROM), an electrically programmable ROM, an electrically erasable programmable ROM, a register, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.

[0157] The features described in the embodiments of this specification can be replaced or combined with each other, so that professional and technical personnel in this field can implement or use the present application.

[0158] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for evaluating a vehicle structure, characterized in that: include: Obtain road surface data based on vehicle information, vehicle speed, working conditions and road surface grade; Build a vehicle model based on structural information and evaluation content; Applying the road surface data to the tire contact point simulated by the vehicle model to obtain a vehicle model with road surface excitation; Obtaining calculation results of parameters to be evaluated for each node in the vehicle model; Calculating an evaluation parameter based on the preset evaluation parameter and the calculation result; Determining whether the evaluation parameters meet preset standards; If yes, output the structure information; If not, the structural information is adjusted until the preset standard is met.

2. The method according to claim 1, characterized in that: The obtaining of road surface data based on vehicle information, vehicle speed, working condition and road surface grade includes: A road spectrum is collected based on the working condition and the road surface grade to obtain road surface data, or a virtual road spectrum is generated based on the vehicle information, the vehicle speed, the working condition and the road surface grade to obtain road surface data.

3. The method according to claim 1, characterized in that The whole vehicle model is established based on the structural information, including: Suspension modeling and body modeling based on structural information; The suspension model obtained by the suspension modeling and the body model obtained by the body modeling are connected to establish the whole vehicle model.

4. The method according to claim 3, characterized in that The suspension modeling based on structural information includes: Using the subframe structure and bushing parameters in the structural information as input parameters, creating a structural unit of the suspension; Based on the structural units of the suspension, a connection grid is created to obtain the suspension model; the connection grid includes a spring damping unit, a concentrated mass unit and a rigid unit.

5. The method according to claim 4, characterized in that The body modeling includes simplified body modeling and complex body modeling, and the body modeling is performed based on the structural information, including: Perform simplified modeling of the vehicle body using the concentrated mass unit and the rigid unit model; Using the body hard points, body weight and body stiffness in the structural information as input parameters, creating a structural unit of the body; Calculating material properties of the vehicle body based on preset parameters and a cross-sectional shape and a cross-sectional area of ​​a structural unit of the vehicle body; The material properties are assigned to the structural units of the vehicle body to perform complex modeling of the vehicle body.

6. The method according to claim 1, characterized in that Build a complete vehicle model based on the evaluation content, including: When the evaluation content is for the front subframe structure, a vehicle model including the front suspension is established, or a vehicle model including the front suspension, rear suspension and body is established; When the evaluation content is for the rear subframe structure, a vehicle model including the rear suspension is established, or a vehicle model including the front suspension, rear suspension and body is established; When the evaluation content is aimed at the front subframe structure and the rear frame structure, a whole vehicle model including the front suspension, rear suspension and body is established, or a whole vehicle model including the front suspension and a whole vehicle model including the rear suspension are established separately.

7. The method according to claim 1, characterized in that The obtaining of the calculation result of the parameter to be evaluated of each node in the vehicle model includes: The parameters to be evaluated of each node in the vehicle model are calculated using a transient response analysis direct method or a modal method to obtain the calculation result.

8. The method according to claim 1, characterized in that The calculating the evaluation parameter based on the preset evaluation parameter and the calculation result includes: Acquire the preset evaluation parameter corresponding to the working condition; The preset evaluation parameter is compared with the calculation result to obtain the evaluation parameter.

9. The method according to claim 4, characterized in that The adjusting the structural information comprises: adjusting the bushing parameters, and obtaining adjusted evaluation parameters according to the adjusted bushing parameters; When the adjusted evaluation parameter still does not meet the preset standard, the subframe structure is adjusted.

10. A device for evaluating a vehicle structure, characterized in that: include: Road surface data acquisition unit, vehicle model building unit, vehicle model building unit, calculation unit, evaluation unit, judgment unit, output unit and adjustment unit; The road surface data acquisition unit is used to acquire road surface data based on vehicle information, vehicle speed, working conditions and road surface grade; The whole vehicle model building unit is used to build a whole vehicle model based on the structural information and the evaluation content; The vehicle model building unit is used to apply the road surface data to the tire contact points simulated by the whole vehicle model to obtain a vehicle model with road surface excitation; The calculation unit is used to obtain the calculation results of the parameters to be evaluated of each node in the vehicle model; The evaluation unit is used to calculate the evaluation parameter based on the preset evaluation parameter and the calculation result; The judging unit is used to judge whether the evaluation parameter meets the preset standard; The output unit is used to output the structural information; The adjustment unit is used to adjust the structural information until the preset standard is met.

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