Vehicle rotational inertia calculation method and device, equipment and medium
By obtaining and changing vehicle state parameters and calculating vehicle moment of inertia using the parallel shaft theorem, the problem of cumbersome and insufficient accuracy of the estimated moment of inertia in the prior art is solved, and the accurate and efficient moment of inertia evaluation of the replaced and modified models is achieved. , reducing the performance risks of the entire vehicle.
Patent Information
- Application Number
- CN202411291445.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-14
- Publication Date
- 2025-01-03
AI Technical Summary
The existing methods are complicated, time-consuming and labor-intensive when estimating the vehicle's moment of inertia, with large errors, and the re-estimation of the moment of inertia re-estimation of the moment of inertia by re-estimating and modified models is unable to ensure data accuracy, resulting in the vehicle's braking and stable operation in the later stage. The performance cannot be achieved and the safety capability of the whole vehicle crash is insufficient.
By obtaining the status parameters of the original vehicle and the target vehicle, the center of mass coordinate transformation of the vehicle is carried out, and the rotational moment of inertia of the target vehicle is calculated using the parallel axis theorem, including obtaining the center of mass position and its own rotational moment of inertia, and using the CATIA data model and actual vehicle test data to calculate the target The moment of inertia of the vehicle.
It realizes accurate and efficient calculation of the moment of inertia of the replacement and modified models, reduces the potential risks of the inability to achieve braking and stabilization performance of the vehicle in the later stage and the insufficient safety capability of the vehicle collision, and improves the design accuracy.
Smart Images
Figure CN119245928A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of vehicle technology, and in particular to a method, device, equipment and medium for calculating the rotational inertia of a vehicle. Background Art
[0002] As an important performance of passenger cars, the accuracy of the early design evaluation of the moment of inertia affects the calculation and evaluation of the performance of handling, stability and other related professionals such as early braking and vehicle dynamics, and thus affects the subsequent achievement of related performance goals. At the same time, the accuracy of the evaluation of the moment of inertia of the whole vehicle also affects the evaluation of the safety performance of the vehicle. Therefore, it is particularly important to accurately evaluate the moment of inertia of the whole vehicle in the early design stage.
[0003] According to the existing methods, the estimated moment of inertia is based on a large number of formula calculations, which are cumbersome, time-consuming, labor-intensive, and have large errors. At the same time, only some assemblies such as the powertrain, battery, and thermal management module are replaced in the replacement and modified models. It is time-consuming and costly to obtain the finished products of the replacement assemblies and install them on the vehicles for re-testing in the early stage of the project. The workload of re-estimating the moment of inertia of the whole vehicle of the replacement and modified models is large, and the test data of the moment of inertia of the whole vehicle of the existing models cannot be used, and the accuracy of the data finally calculated cannot be guaranteed. Summary of the invention
[0004] In view of this, the purpose of this application is to provide a method, device, equipment and medium for calculating the rotational inertia of a vehicle, which can accurately and efficiently obtain the rotational inertia information of replacement and modified models, and be used for the design of relevant parts of the vehicle chassis, calculation of vehicle performance and related parameters, etc., thereby reducing potential risks such as the inability to achieve performance such as braking and handling stability of the vehicle in the later stage, and insufficient collision safety capability of the vehicle.
[0005] In a first aspect, an embodiment of the present application provides a method for calculating the moment of inertia of a vehicle, the method comprising:
[0006] Acquire a first state parameter of the original vehicle and a second state parameter of the target vehicle; wherein the target vehicle is obtained by replacing the original vehicle assembly in the original vehicle with the target vehicle assembly;
[0007] Performing a vehicle mass center coordinate transformation on the original vehicle, and calculating a first vehicle mass center position of the original vehicle after removing the original vehicle assembly and a second vehicle mass center position of the target vehicle based on the first state parameter and the second state parameter;
[0008] The parallel axis theorem is used to calculate the moment of inertia of the target vehicle based on the first state parameter, the second state parameter, the first vehicle center of mass position, and the second vehicle center of mass position to obtain a target moment of inertia of the target vehicle.
[0009] Further, the first state parameter includes a first center of mass position of the original vehicle assembly in the whole vehicle coordinate system of the original vehicle, a first self moment of inertia of the original vehicle assembly, an original whole vehicle center of mass position of the original vehicle, and an original whole vehicle center of mass position moment of inertia of the original vehicle;
[0010] The second state parameter includes a second center of mass position of the target vehicle assembly in the whole vehicle coordinate system of the target vehicle, and a second self moment of inertia of the target vehicle assembly.
[0011] Furthermore, the calculation method also includes:
[0012] The inertia measurement function of the assembly design module in the CATIA data model is used to obtain the first mass center position, the first self-rotational inertia, the second mass center position and the second self-rotational inertia of the target vehicle assembly.
[0013] Furthermore, the calculation method also includes:
[0014] A test for evaluating the vehicle dynamics characteristics is carried out using a real vehicle to obtain the original vehicle center of mass position and the original moment of inertia of the vehicle center of mass position.
[0015] Furthermore, before performing the vehicle mass center coordinate transformation on the original vehicle and calculating the first vehicle mass center position of the original vehicle after removing the original vehicle assembly and the second vehicle mass center position of the target vehicle based on the first state parameter and the second state parameter, the calculation method further includes:
[0016] Obtaining the original assembly weight of the original vehicle assembly, the original vehicle weight of the original vehicle, and the weight of the original vehicle after removing the original vehicle assembly;
[0017] The target assembly weight of the target vehicle assembly and the target vehicle weight of the target vehicle are obtained.
[0018] Furthermore, the performing of the vehicle center of mass coordinate transformation on the original vehicle, and calculating the first vehicle center of mass position of the original vehicle after removing the original vehicle assembly and the second vehicle center of mass position of the target vehicle based on the first state parameter and the second state parameter, includes:
[0019] Calculating a first vehicle center of mass position based on the original assembly weight, the original vehicle weight, the removed weight, the first center of mass position, and the second center of mass position;
[0020] A second vehicle center of mass position is calculated based on the target assembly weight, the removed weight, the target vehicle weight, the second center of mass position, and the first vehicle center of mass position.
[0021] Further, the use of the parallel axis theorem to calculate the moment of inertia of the target vehicle based on the first state parameter, the second state parameter, the first vehicle center of mass position, and the second vehicle center of mass position to obtain a target moment of inertia of the target vehicle includes:
[0022] Calculate the vehicle moment of inertia of the original vehicle after removing the original vehicle assembly based on the original assembly weight, the weight after removal, the first center of mass position, the original vehicle center of mass position, the first vehicle center of mass position, the first self moment of inertia, and the original vehicle center of mass position moment of inertia;
[0023] The target moment of inertia of the target vehicle is calculated based on the target assembly weight, the removed weight, the second self moment of inertia, the first whole vehicle center of mass position, the second whole vehicle center of mass position, the second center of mass position and the whole vehicle moment of inertia.
[0024] In a second aspect, an embodiment of the present application further provides a device for calculating the moment of inertia of a vehicle, the device comprising:
[0025] A parameter acquisition module, used to acquire a first state parameter of an original vehicle and a second state parameter of a target vehicle; wherein the target vehicle is obtained by replacing an original vehicle assembly in the original vehicle with a target vehicle assembly;
[0026] A center of mass position calculation module, used for performing a whole vehicle center of mass coordinate transformation on the original vehicle, and calculating a first whole vehicle center of mass position of the original vehicle after removing the original vehicle assembly and a second whole vehicle center of mass position of the target vehicle based on the first state parameter and the second state parameter;
[0027] The moment of inertia calculation module is used to calculate the moment of inertia of the target vehicle based on the first state parameter, the second state parameter, the first vehicle center of mass position and the second vehicle center of mass position by using the parallel axis theorem to obtain a target moment of inertia of the target vehicle.
[0028] In a third aspect, an embodiment of the present application further provides an electronic device, comprising: a processor, a memory and a bus, wherein the memory stores machine-readable instructions executable by the processor, and when the electronic device is running, the processor and the memory communicate via the bus, and when the machine-readable instructions are executed by the processor, the steps of the vehicle rotational inertia calculation method as described above are performed.
[0029] In a fourth aspect, an embodiment of the present application further provides a computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the steps of the method for calculating the rotational inertia of the vehicle as described above are executed.
[0030] The embodiments of the present application provide a method, device, equipment and medium for calculating the rotational inertia of a vehicle. First, a first state parameter of an original vehicle and a second state parameter of a target vehicle are obtained; wherein the target vehicle is obtained by replacing an original vehicle assembly in the original vehicle with a target vehicle assembly; then, the original vehicle is subjected to a whole vehicle center of mass coordinate transformation, and a first whole vehicle center of mass position of the original vehicle after removing the original vehicle assembly and a second whole vehicle center of mass position of the target vehicle are calculated based on the first state parameter and the second state parameter; finally, the moment of inertia of the target vehicle is calculated based on the first state parameter, the second state parameter, the first whole vehicle center of mass position and the second whole vehicle center of mass position using the parallel axis theorem to obtain a target moment of inertia of the target vehicle.
[0031] This application uses three steps, namely, parameter acquisition, vehicle center of mass coordinate change, and moment of inertia calculation, to quickly estimate the moment of inertia. This enables accurate and efficient acquisition of moment of inertia information for replacement and modified models in the early stages of research and development, which can be used for the design of vehicle chassis-related parts, vehicle performance and related parameter calculations, etc., reducing potential risks such as failure to achieve vehicle braking, handling stability, and insufficient vehicle collision safety capabilities in the later stages.
[0032] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS
[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.
[0034] Figure 1 A flow chart of a method for calculating the moment of inertia of a vehicle provided in an embodiment of the present application;
[0035] Figure 2 One of the structural schematic diagrams of a device for calculating the rotational inertia of a vehicle provided in an embodiment of the present application;
[0036] Figure 3 A second structural schematic diagram of a device for calculating the moment of inertia of a vehicle provided in an embodiment of the present application;
[0037] Figure 4 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION
[0038] To make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application usually described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, each other embodiment obtained by those skilled in the art without making creative work belongs to the scope of protection of the present application.
[0039] First, the application scenarios to which the present application is applicable are introduced. The present application can be applied in the field of vehicle technology.
[0040] As an important performance of passenger cars, the accuracy of the early design evaluation of the moment of inertia affects the calculation and evaluation of the performance of handling, stability and other related professionals such as early braking and vehicle dynamics, and thus affects the subsequent achievement of related performance goals. At the same time, the accuracy of the evaluation of the moment of inertia of the whole vehicle also affects the evaluation of the safety performance of the vehicle. Therefore, it is particularly important to accurately evaluate the moment of inertia of the whole vehicle in the early design stage.
[0041] Research has found that according to existing methods, the estimated moment of inertia is based on a large number of formula calculations, which are cumbersome, time-consuming, labor-intensive, and have large errors. At the same time, only some assemblies such as the powertrain, battery, and thermal management module are replaced in the replacement and modified models. It is time-consuming and costly to obtain the finished products of the replacement assemblies and re-test them in the early stage of the project. The workload of re-estimating the moment of inertia of the whole vehicle of the replacement and modified models is large, and the test data of the moment of inertia of the whole vehicle of the existing models cannot be used, and the accuracy of the data finally calculated cannot be guaranteed.
[0042] Based on this, the embodiment of the present application provides a method for calculating the rotational inertia of a vehicle, which can accurately and efficiently obtain the rotational inertia information of replacement and modified vehicle models, which can be used for the design of related parts of the vehicle chassis, calculation of vehicle performance and related parameters, etc., thereby reducing potential risks such as the inability to achieve performance such as braking and handling stability of the vehicle in the later stage, and insufficient collision safety capabilities of the vehicle.
[0043] See also Figure 1 , Figure 1 This is a flow chart of a method for calculating the moment of inertia of a vehicle provided in an embodiment of the present application. Figure 1As shown in , the calculation method provided in the embodiment of the present application includes:
[0044] S101, obtaining a first state parameter of an original vehicle and a second state parameter of a target vehicle.
[0045] Here, the target vehicle refers to the vehicle obtained by replacing the original vehicle assembly in the original vehicle with the target vehicle assembly, i.e., a replacement or modified model. The replaced vehicle assembly may be the vehicle's powertrain, battery, thermal management module, etc., which is not specifically limited in this application.
[0046] Regarding the above step S101, in a specific implementation, after the target vehicle is obtained by replacing the original vehicle assembly in the original vehicle with the target vehicle assembly, a first state parameter of the original vehicle and a second state parameter of the target vehicle are obtained.
[0047] Specifically, the first state parameters of the original vehicle include: the first center of mass position (x1, y1, z1) of the original vehicle assembly in the whole vehicle coordinate system of the original vehicle, the first self moment of inertia (Ixx1, Iyy1, Izz1) of the original vehicle assembly, the original whole vehicle center of mass position (x3, y3, z3) of the original vehicle, and the original whole vehicle center of mass position moment of inertia (Ixx3, Iyy3, Izz3) of the original vehicle;
[0048] The second state parameters of the target vehicle include: the second center of mass position (x2, y2, z2) of the target vehicle assembly in the whole vehicle coordinate system of the target vehicle and the second own moment of inertia (Ixx2, Iyy2, Izz2) of the target vehicle assembly.
[0049] Here, in the above step S101, the center of mass position and moment of inertia of the original vehicle assembly and the target vehicle assembly are mainly realized, as well as the center of mass position and moment of inertia of the original vehicle. Specifically, in order to realize the accurate evaluation and calculation of the moment of inertia, it is necessary to obtain the center of mass position of the original vehicle assembly based on its own coordinate system, the original vehicle assembly's own moment of inertia, the center of mass position of the target vehicle assembly based on its own coordinate system, and the own moment of inertia of the target vehicle assembly. Specifically set as: the first center of mass position (x1, y1, z1) of the original vehicle assembly in the vehicle coordinate system of the original vehicle, the first own moment of inertia (Ixx1, Iyy1, Izz1) of the original vehicle assembly, the second center of mass position (x2, y2, z2) of the target vehicle assembly in the vehicle coordinate system of the target vehicle, and the second own moment of inertia (Ixx2, Iyy2, Izz2) of the target vehicle assembly. It is also necessary to obtain the center of mass position of the original vehicle and the moment of inertia of the center of mass position of the original vehicle. The specific settings are: the original vehicle center of mass position of the original vehicle (x3, y3, z3) and the original vehicle center of mass position moment of inertia of the original vehicle (Ixx3, Iyy3, Izz3).
[0050] Further, according to the embodiment provided by the present application, the state parameters are obtained through the following steps:
[0051] The inertia measurement function of the assembly design module in the CATIA data model is used to obtain the first mass center position, the first self-rotational inertia, the second mass center position and the second self-rotational inertia of the target vehicle assembly.
[0052] For the above steps, in the specific implementation, the original vehicle assembly and the target vehicle assembly can be directly obtained by measuring the layout data based on the center of mass position and its own moment of inertia in the whole vehicle coordinate system using the measurement inertia function of the assembly design module in CATIA. Specifically, the measurement inertia function of the assembly design module in the CATIA data model is used to obtain the first center of mass position (x1, y1, z1), the first moment of inertia (Ixx1, Iyy1, Izz1), the second center of mass position (x2, y2, z2) of the original vehicle assembly and the second moment of inertia (Ixx2, Iyy2, Izz2) of the target vehicle assembly. It should be noted that the assembly to be measured must be CATIA assembly data with a complete internal structure; parts of different materials need to use the application material function to give them different material densities; the measurement center of mass position and the moment of inertia coordinate axis direction must be consistent with the vehicle coordinate axis direction.
[0053] A test for evaluating the vehicle dynamics characteristics is carried out using a real vehicle to obtain the original vehicle center of mass position and the original moment of inertia of the vehicle center of mass position.
[0054] For the above steps, in the specific implementation, the original vehicle center of mass position and the original vehicle center of mass position moment of inertia can be obtained by using a real vehicle to conduct tests for evaluating vehicle dynamics characteristics because the product project has been completed. Specifically, a real vehicle is used to conduct tests for evaluating vehicle dynamics characteristics to obtain the original vehicle center of mass position (x3, y3, z3) and the original vehicle center of mass position moment of inertia (Ixx3, Iyy3, Izz3).
[0055] Further, according to the calculation method provided in the embodiment of the present application, before performing the whole vehicle mass center coordinate transformation on the original vehicle and calculating the first whole vehicle mass center position of the original vehicle after removing the original vehicle assembly and the second whole vehicle mass center position of the target vehicle based on the first state parameter and the second state parameter, the calculation method also includes:
[0056] Obtain the original assembly weight m1 of the original vehicle assembly, the original vehicle weight m3 of the original vehicle, and the weight m4 of the original vehicle after removing the original vehicle assembly; obtain the target assembly weight m2 of the target vehicle assembly and the target vehicle weight m5 of the target vehicle.
[0057] S102, performing a vehicle center of mass coordinate transformation on the original vehicle, and calculating a first vehicle center of mass position of the original vehicle after removing the original vehicle assembly and a second vehicle center of mass position of the target vehicle based on the first state parameter and the second state parameter.
[0058] In the above step S102, the coordinate change of the center of mass of the whole vehicle is mainly realized. It is necessary to calculate the center of mass position of the whole vehicle after the original vehicle assembly is removed, and the center of mass position of the whole vehicle of the target vehicle after the vehicle assembly is replaced. For the above step S102, in the specific implementation, the center of mass coordinates of the whole vehicle are transformed for the original vehicle, and the first center of mass position of the original vehicle after the original vehicle assembly is removed and the second center of mass position of the target vehicle are calculated based on the first state parameter and the second state parameter obtained in step S101.
[0059] Specifically, with respect to the above step S102, the coordinate transformation of the center of mass of the original vehicle is performed, and a first center of mass position of the original vehicle after removing the original vehicle assembly and a second center of mass position of the target vehicle are calculated based on the first state parameter and the second state parameter, including:
[0060] Step 1021, calculating the first vehicle center of mass position based on the original assembly weight, the original vehicle weight, the weight after removal, the first center of mass position and the second center of mass position.
[0061] For the above step 1021, in the specific implementation, the first vehicle center of mass position (x4, y4, z4) is calculated based on the original assembly weight m1, the original vehicle weight m3, the removed weight m4, the first center of mass position (x1, y1, z1) and the second center of mass position (x3, y3, z3).
[0062] Specifically, the first vehicle center of mass position (x4, y4, z4) after removing the original vehicle assembly from the original vehicle is calculated by the following formula:
[0063] x4×m4=x3×m3-x1×m1
[0064] y4×m4=y3×m3-y1×m1
[0065] z4×m4=z3×m3-z1×m1
[0066] Step 1022, calculating the second vehicle center of mass position based on the target assembly weight, the weight after removal, the target vehicle weight, the second center of mass position and the first vehicle center of mass position.
[0067] For the above step 1022, in the specific implementation, the second vehicle center of mass position (x5, y5, z5) is calculated based on the target assembly weight m2, the removed weight m4, the target vehicle weight m5, the second center of mass position (x2, y2, z2) and the first vehicle center of mass position (x4, y4, z4) calculated in the above step 1021.
[0068] Specifically, the second vehicle center of mass position (x5, y5, z5) of the target vehicle is calculated by the following formula:
[0069] x5×m5=x4×m4+x2×m2
[0070] y5×m5=y4×m4+y2×m2
[0071] z5×m5=z4×m4+z2×m2
[0072] S103, using the parallel axis theorem, calculate the moment of inertia of the target vehicle based on the first state parameter, the second state parameter, the first vehicle center of mass position, and the second vehicle center of mass position to obtain a target moment of inertia of the target vehicle.
[0073] In the above step S103, the parallel axis theorem is mainly used to calculate the moment of inertia of the target vehicle. It is necessary to obtain the moment of inertia of the original vehicle after removing the original vehicle assembly, and finally calculate the target moment of inertia of the target vehicle. For the above step S103, in the specific implementation, the parallel axis theorem is used to calculate the moment of inertia of the target vehicle based on the first state parameter and the second state parameter obtained in the above step S101, the first vehicle center of mass position and the second vehicle center of mass position calculated in the above step S102, so as to obtain the target moment of inertia of the target vehicle.
[0074] Specifically, with respect to the above step S103, the use of the parallel axis theorem to calculate the moment of inertia of the target vehicle based on the first state parameter, the second state parameter, the first vehicle center of mass position, and the second vehicle center of mass position to obtain the target moment of inertia of the target vehicle includes:
[0075] Step 1031, calculate the vehicle moment of inertia of the original vehicle after removing the original vehicle assembly based on the original assembly weight, the weight after removal, the first center of mass position, the original vehicle center of mass position, the first vehicle center of mass position, the first self moment of inertia and the moment of inertia of the original vehicle center of mass position.
[0076] For the above step 1031, in the specific implementation, the vehicle moment of inertia (Ixx4, Iyy4, Izz4) of the original vehicle after removing the original vehicle assembly is calculated based on the original assembly weight m1, the weight after removal m4, the first center of mass position (x1, y1, z1), the original vehicle center of mass position (x3, y3, z3), the first vehicle center of mass position (x4, y4, z4), the first own moment of inertia (Ixx1, Iyy1, Izz1) and the original vehicle center of mass position moment of inertia (Ixx3, Iyy3, Izz3).
[0077] Specifically, the moment of inertia of the original vehicle after removing the original vehicle assembly (Ixx4, Iyy4, Izz4) can be calculated using the parallel axis theorem by the following formula:
[0078] I xx4 =I xx3 -I xx1 -m4×(x4-x3) 2 -m1×(x3-x1) 2
[0079] I yy4 =I yy3 -I yy1 -m4×(y4-y3) 2 -m1×(y3-y1) 2
[0080] I zz4 =I zz3 -I zz1 -m4×(z4-z3) 2 -m1×(z3-z1) 2
[0081] Step 1032, calculate the target moment of inertia of the target vehicle based on the target assembly weight, the removed weight, the second self moment of inertia, the first vehicle center of mass position, the second vehicle center of mass position, the second center of mass position and the vehicle moment of inertia.
[0082] For the above step 1032, in the specific implementation, the target moment of inertia (Ixx5, Iyy5, Izz5) of the target vehicle is calculated based on the target assembly weight m2, the removed weight m4, the second self-moment of inertia (Ixx2, Iyy2, Izz2), the first vehicle center of mass position (x4, y4, z4), the second vehicle center of mass position (x5, y5, z5), the second center of mass position (x2, y2, z2) and the vehicle moment of inertia (Ixx4, Iyy4, Izz4) calculated in the above step 1031.
[0083] Specifically, the target moment of inertia (Ixx5, Iyy5, Izz5) of the target vehicle is calculated by the following formula:
[0084] I xx5 =I xx2 +I xx4 +m2×(x5-x2)2+m4×(x4-x5)2
[0085] I yy5 =I yy2 +I yy4 +m2×(y5-y2) 2 +m4×(y4-y5) 2
[0086] I zz5 =I zz2 +I zz4 +m2×(z5-z2) 2 +m4×(z4-z5) 2
[0087] The method for calculating the rotational inertia of a vehicle provided in an embodiment of the present application first obtains a first state parameter of an original vehicle and a second state parameter of a target vehicle; wherein the target vehicle is obtained by replacing an original vehicle assembly in the original vehicle with a target vehicle assembly; then, the coordinates of the center of mass of the original vehicle are transformed, and the first center of mass position of the original vehicle after removing the original vehicle assembly and the second center of mass position of the target vehicle are calculated based on the first state parameter and the second state parameter; finally, the moment of inertia of the target vehicle is calculated based on the first state parameter, the second state parameter, the first center of mass position and the second center of mass position using the parallel axis theorem to obtain the target moment of inertia of the target vehicle.
[0088] This application uses three steps, namely, parameter acquisition, vehicle center of mass coordinate change, and moment of inertia calculation, to quickly estimate the moment of inertia. This enables accurate and efficient acquisition of moment of inertia information for replacement and modified models in the early stages of research and development, which can be used for the design of vehicle chassis-related parts, vehicle performance and related parameter calculations, etc., reducing potential risks such as failure to achieve vehicle braking, handling stability, and insufficient vehicle collision safety capabilities in the later stages.
[0089] See also Figure 2 , Figure 2 , Figure 2 This is one of the structural schematic diagrams of a device for calculating the rotational inertia of a vehicle provided in an embodiment of the present application. Figure 3 This is a second structural diagram of a device for calculating the moment of inertia of a vehicle provided in an embodiment of the present application. Figure 2 As shown in , the computing device 200 includes:
[0090] The parameter acquisition module 201 is used to acquire a first state parameter of an original vehicle and a second state parameter of a target vehicle; wherein the target vehicle is obtained by replacing an original vehicle assembly in the original vehicle with a target vehicle assembly;
[0091] A center of mass position calculation module 202, configured to transform the center of mass coordinates of the original vehicle, and calculate a first center of mass position of the original vehicle after removing the original vehicle assembly and a second center of mass position of the target vehicle based on the first state parameter and the second state parameter;
[0092] The moment of inertia calculation module 203 is used to calculate the moment of inertia of the target vehicle based on the first state parameter, the second state parameter, the first vehicle center of mass position and the second vehicle center of mass position using the parallel axis theorem to obtain the target moment of inertia of the target vehicle.
[0093] Further, the first state parameter includes a first center of mass position of the original vehicle assembly in the whole vehicle coordinate system of the original vehicle, a first self moment of inertia of the original vehicle assembly, an original whole vehicle center of mass position of the original vehicle, and an original whole vehicle center of mass position moment of inertia of the original vehicle;
[0094] The second state parameter includes a second center of mass position of the target vehicle assembly in the whole vehicle coordinate system of the target vehicle, and a second self moment of inertia of the target vehicle assembly.
[0095] Furthermore, the parameter acquisition module 201 is also used for:
[0096] The inertia measurement function of the assembly design module in the CATIA data model is used to obtain the first mass center position, the first self-rotational inertia, the second mass center position and the second self-rotational inertia of the target vehicle assembly.
[0097] Furthermore, the parameter acquisition module 201 is also used for:
[0098] A test for evaluating the vehicle dynamics characteristics is carried out using a real vehicle to obtain the original vehicle center of mass position and the original moment of inertia of the vehicle center of mass position.
[0099] For further information, see Figure 3The computing device 200 further includes a weight parameter acquisition module 204, which is used to: before performing a vehicle mass center coordinate transformation on the original vehicle and calculating a first vehicle mass center position of the original vehicle after removing the original vehicle assembly and a second vehicle mass center position of the target vehicle based on the first state parameter and the second state parameter:
[0100] Obtaining the original assembly weight of the original vehicle assembly, the original vehicle weight of the original vehicle, and the weight of the original vehicle after removing the original vehicle assembly;
[0101] The target assembly weight of the target vehicle assembly and the target vehicle weight of the target vehicle are obtained.
[0102] Further, when the center of mass position calculation module 202 is used to perform a whole vehicle center of mass coordinate transformation on the original vehicle and calculate a first whole vehicle center of mass position of the original vehicle after removing the original vehicle assembly and a second whole vehicle center of mass position of the target vehicle based on the first state parameter and the second state parameter, the center of mass position calculation module 202 is also used to:
[0103] Calculating a first vehicle center of mass position based on the original assembly weight, the original vehicle weight, the removed weight, the first center of mass position, and the second center of mass position;
[0104] A second vehicle center of mass position is calculated based on the target assembly weight, the removed weight, the target vehicle weight, the second center of mass position, and the first vehicle center of mass position.
[0105] Further, when the moment of inertia calculation module 203 is used to calculate the moment of inertia of the target vehicle based on the first state parameter, the second state parameter, the first vehicle center of mass position, and the second vehicle center of mass position using the parallel axis theorem to obtain the target moment of inertia of the target vehicle, the moment of inertia calculation module 203 is also used to:
[0106] Calculate the vehicle moment of inertia of the original vehicle after removing the original vehicle assembly based on the original assembly weight, the weight after removal, the first center of mass position, the original vehicle center of mass position, the first vehicle center of mass position, the first self moment of inertia, and the original vehicle center of mass position moment of inertia;
[0107] The target moment of inertia of the target vehicle is calculated based on the target assembly weight, the removed weight, the second self moment of inertia, the first whole vehicle center of mass position, the second whole vehicle center of mass position, the second center of mass position and the whole vehicle moment of inertia.
[0108] See also Figure 4 , Figure 4 This is a schematic diagram of the structure of an electronic device provided in an embodiment of the present application. Figure 4 As shown in , the electronic device 400 includes a processor 410 , a memory 420 and a bus 430 .
[0109] The memory 420 stores machine-readable instructions executable by the processor 410. When the electronic device 400 is running, the processor 410 communicates with the memory 420 via the bus 430. When the machine-readable instructions are executed by the processor 410, the above-mentioned Figure 1 The steps of the method for calculating the vehicle rotational inertia in the method embodiment shown, the specific implementation method can be found in the method embodiment, and will not be repeated here.
[0110] The present application also provides a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the computer program can execute the above-mentioned Figure 1 The steps of the method for calculating the vehicle rotational inertia in the method embodiment shown, the specific implementation method can be found in the method embodiment, and will not be repeated here.
[0111] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.
[0112] In the several embodiments provided in the present application, it should be understood that the disclosed systems, 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 devices or units can be electrical, mechanical or other forms.
[0113] 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.
[0114] In addition, each functional unit in each embodiment of 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.
[0115] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a non-volatile computer-readable storage medium that is executable by a processor. Based on this understanding, the technical solution of the present application can essentially be embodied in the form of a software product, or in other words, the part that contributes to the prior art or the part of the technical solution. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.
[0116] 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 solutions of the present application, rather than to limit them. The protection scope of the present application is not limited thereto. Although the present application is described in detail with reference to the above-mentioned embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above-mentioned 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 solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should 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. A method for calculating the moment of inertia of a vehicle, characterized in that: The calculation method includes: Acquire a first state parameter of the original vehicle and a second state parameter of the target vehicle; wherein the target vehicle is obtained by replacing the original vehicle assembly in the original vehicle with the target vehicle assembly; Performing a vehicle mass center coordinate transformation on the original vehicle, and calculating a first vehicle mass center position of the original vehicle after removing the original vehicle assembly and a second vehicle mass center position of the target vehicle based on the first state parameter and the second state parameter; The parallel axis theorem is used to calculate the moment of inertia of the target vehicle based on the first state parameter, the second state parameter, the first vehicle center of mass position, and the second vehicle center of mass position to obtain a target moment of inertia of the target vehicle.
2. The calculation method according to claim 1, characterized in that: The first state parameter includes a first center of mass position of the original vehicle assembly in the whole vehicle coordinate system of the original vehicle, a first self moment of inertia of the original vehicle assembly, an original whole vehicle center of mass position of the original vehicle, and an original whole vehicle center of mass position moment of inertia of the original vehicle; The second state parameter includes a second center of mass position of the target vehicle assembly in the whole vehicle coordinate system of the target vehicle, and a second self moment of inertia of the target vehicle assembly.
3. The calculation method according to claim 2, characterized in that: The calculation method also includes: The inertia measurement function of the assembly design module in the CATIA data model is used to obtain the first mass center position, the first self-rotational inertia, the second mass center position and the second self-rotational inertia of the target vehicle assembly.
4. The calculation method according to claim 2, characterized in that: The calculation method also includes: A test for evaluating the vehicle dynamics characteristics is carried out using a real vehicle to obtain the original vehicle center of mass position and the original moment of inertia of the vehicle center of mass position.
5. The calculation method according to claim 2, characterized in that: Before performing the whole vehicle mass center coordinate transformation on the original vehicle and calculating the first whole vehicle mass center position of the original vehicle after removing the original vehicle assembly and the second whole vehicle mass center position of the target vehicle based on the first state parameter and the second state parameter, the calculation method further includes: Obtaining the original assembly weight of the original vehicle assembly, the original vehicle weight of the original vehicle, and the weight of the original vehicle after removing the original vehicle assembly; The target assembly weight of the target vehicle assembly and the target vehicle weight of the target vehicle are obtained.
6. The calculation method according to claim 5, characterized in that: The step of performing a whole vehicle mass center coordinate transformation on the original vehicle and calculating a first whole vehicle mass center position of the original vehicle after removing the original vehicle assembly and a second whole vehicle mass center position of the target vehicle based on the first state parameter and the second state parameter includes: Calculating a first vehicle center of mass position based on the original assembly weight, the original vehicle weight, the removed weight, the first center of mass position, and the second center of mass position; A second vehicle center of mass position is calculated based on the target assembly weight, the removed weight, the target vehicle weight, the second center of mass position, and the first vehicle center of mass position.
7. The calculation method according to claim 5, characterized in that: The method of calculating the moment of inertia of the target vehicle by using the parallel axis theorem based on the first state parameter, the second state parameter, the first vehicle center of mass position, and the second vehicle center of mass position to obtain a target moment of inertia of the target vehicle includes: Calculate the vehicle moment of inertia of the original vehicle after removing the original vehicle assembly based on the original assembly weight, the weight after removal, the first center of mass position, the original vehicle center of mass position, the first vehicle center of mass position, the first self moment of inertia, and the original vehicle center of mass position moment of inertia; The target moment of inertia of the target vehicle is calculated based on the target assembly weight, the removed weight, the second self moment of inertia, the first whole vehicle center of mass position, the second whole vehicle center of mass position, the second center of mass position and the whole vehicle moment of inertia.
8. A device for calculating the moment of inertia of a vehicle, characterized in that: The computing device comprises: A parameter acquisition module, used to acquire a first state parameter of an original vehicle and a second state parameter of a target vehicle; wherein the target vehicle is obtained by replacing an original vehicle assembly in the original vehicle with a target vehicle assembly; A center of mass position calculation module, used for performing a whole vehicle center of mass coordinate transformation on the original vehicle, and calculating a first whole vehicle center of mass position of the original vehicle after removing the original vehicle assembly and a second whole vehicle center of mass position of the target vehicle based on the first state parameter and the second state parameter; The moment of inertia calculation module is used to calculate the moment of inertia of the target vehicle based on the first state parameter, the second state parameter, the first vehicle center of mass position and the second vehicle center of mass position by using the parallel axis theorem to obtain a target moment of inertia of the target vehicle.
9. An electronic device, characterized in that: include: A processor, a memory and a bus, wherein the memory stores machine-readable instructions executable by the processor, and when the electronic device is running, the processor and the memory communicate through the bus, and the machine-readable instructions are executed by the processor to execute the steps of the method for calculating the vehicle rotational inertia as described in any one of claims 1 to 7.
10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the method for calculating the rotational inertia of a vehicle as claimed in any one of claims 1 to 7 are executed.