CN-121980688-A - Engine hood parameter determination method and device, engine hood and vehicle

CN121980688ACN 121980688 ACN121980688 ACN 121980688ACN-121980688-A

Abstract

The application provides an engine hood parameter determining method and device, an engine hood and a vehicle. The method comprises the steps of obtaining design parameters of an engine cover, calculating an absorption energy value of the engine cover corresponding to the design parameters, calculating a collision loss value of the engine cover corresponding to the design parameters, optimizing the design parameters by adopting a multi-objective optimization algorithm, and obtaining updated design parameters when the absorption energy value reaches an energy maximum value and the collision loss value reaches a loss minimum value, wherein the updated design parameters are used for constructing the engine cover. The problem that the design cost of engine hood is higher among the prior art has been solved to this scheme.

Inventors

SONG XIAOYU
ZHAO JINGWEI
XU HONGYU
LI ZIXUAN
XU ZHIQIANG
SHEN WEI
SHI XIAOCHENG
LIU ZHENSHAN
LI YINGDONG
JIN CHAOYU
ZHAO PIZHI
WANG GUOJUN

Assignees

中铝(浙江)汽车轻量化科技有限公司
中铝材料应用研究院有限公司

Dates

Publication Date: 20260505
Application Date: 20260407

Claims (10)

1. A method for determining parameters of an engine hood, comprising: obtaining design parameters of an engine cover, wherein the design parameters comprise one or more of material marks, thickness distribution, reinforcement shapes, reinforcement numbers, reinforcement distribution, hollowed-out area shapes, hollowed-out area numbers and hollowed-out area distribution; calculating an absorption energy value of the engine cover corresponding to the design parameter, and calculating a collision loss value of the engine cover corresponding to the design parameter, wherein the absorption energy value is a kinetic energy value of absorption of the engine cover corresponding to the design parameter under the condition of collision, and the collision loss value is a stress value received by a target object under the condition of collision; and optimizing by adopting a multi-objective optimization algorithm, and adjusting the design parameters until the collision loss value reaches the minimum loss value while the energy absorption value reaches the maximum energy value, so as to obtain updated design parameters, wherein the updated design parameters are used for constructing the engine cover.
2. The method of claim 1, wherein optimizing the design parameters using a multi-objective optimization algorithm until the collision loss value reaches a loss minimum value while the absorbed energy value reaches an energy maximum value, comprises: the multi-objective optimization algorithm is adopted to adjust the design parameters for a plurality of times as variables, and the absorption energy value and the collision loss value after each adjustment of the design parameters are obtained; Extracting the maximum value of the absorption energy values after the design parameters are adjusted, extracting the minimum value of the collision loss values after the design parameters are adjusted, extracting the adjusted design parameters corresponding to the maximum value of the absorption energy values and the minimum value of the collision loss values, and obtaining the updated design parameters.
3. The method of claim 2, wherein performing a plurality of adjustments using the multi-objective optimization algorithm with the design parameter as a variable and obtaining the absorption energy value and the collision loss value after each adjustment of the design parameter comprises: simulating a strain value of the material corresponding to the material brand by adopting a Johnson-Cook model; constructing a finite element model of the engine cover by adopting the design parameters to obtain an engine cover model; And adopting the multi-objective optimization algorithm, adjusting the design parameters in the engine cover model for a plurality of times based on the strain value of the material obtained by simulation, and acquiring the absorption energy value and the collision loss value after each adjustment of the design parameters.
4. A method according to claim 3, wherein simulating the strain value of the material corresponding to the material brand using a johnson-kuk model comprises: Carrying out a tensile test on the material corresponding to the material mark in a laboratory, and constructing a strain curve of the material corresponding to the material mark to obtain a strain curve; and fitting the strain curve of the material corresponding to the material mark by adopting the Johnson-Cook model to obtain the simulated strain value of the material corresponding to the material mark.
5. The method according to claim 1, wherein calculating an absorption energy value of the hood corresponding to the design parameter, calculating a collision loss value of the hood corresponding to the design parameter, comprises: simulating the collision between the engine cover and the target object by adopting a simulation technology; And extracting the absorption energy value and the collision loss value of the collision between the engine cover and the target object corresponding to the design parameters in the simulation process by adopting simulation software.
6. The method of claim 1, wherein the design parameters are adjusted after optimizing using a multi-objective optimization algorithm until the collision loss value reaches a loss minimum value while the absorbed energy value reaches an energy maximum value, the method further comprising, after obtaining updated design parameters: Constructing a digital twin model of the engine hood by adopting the updated design parameters to obtain the digital twin model of the engine hood; the hood digital twin model is presented in a display device.
7. The method of claim 6, wherein after constructing a digital twin model of the hood using the updated design parameters, the method further comprises: Acquiring an actual absorption energy value and an actual collision loss value, wherein the actual absorption energy value is an actual kinetic energy value of absorption of the engine cover corresponding to the design parameter under the condition of collision, and the actual collision loss value is an actual stress value received by the target object under the condition of collision; calculating the difference value between the actual absorption energy value and the absorption energy value to obtain an energy difference value; Calculating the difference value between the actual collision loss value and the collision loss value to obtain a loss difference value; optimizing the engine hood digital twin model to obtain an optimized engine hood digital twin model under the condition that the energy difference value is larger than or equal to a preset energy threshold value and/or the loss difference value is larger than or equal to a preset loss threshold value, wherein the optimizing mode at least comprises finite element optimization; and displaying the optimized engine cover digital twin model in the display device.
8. A parameter determining apparatus of an engine hood, characterized by comprising: the first acquisition unit is used for acquiring design parameters of the engine cover, wherein the design parameters comprise one or more of material marks, thickness distribution, reinforcement shapes, reinforcement quantity, reinforcement distribution, hollowed-out area shapes, hollowed-out area quantity and hollowed-out area distribution; A first calculation unit configured to calculate an absorption energy value of the engine hood corresponding to the design parameter, and calculate a collision loss value of the engine hood corresponding to the design parameter, where the absorption energy value is a kinetic energy value of absorption of the engine hood corresponding to the design parameter in the event of a collision, and the collision loss value is a stress value received by a target object in the event of a collision; And the optimizing unit is used for optimizing by adopting a multi-objective optimizing algorithm, and adjusting the design parameters until the collision loss value reaches the minimum loss value while the absorption energy value reaches the maximum energy value, so as to obtain updated design parameters, wherein the updated design parameters are used for constructing the engine cover.
9. A hood, characterized in that the hood is manufactured according to the hood parameter determination method according to any one of claims 1 to 7.
10. A vehicle characterized in that it comprises a hood, which is the hood of claim 9.

Description

Engine hood parameter determination method and device, engine hood and vehicle Technical Field The present application relates to the technical field of engines, and in particular, to a method for determining parameters of an engine hood, a device for determining parameters of an engine hood, and a vehicle. Background In the current automobile industry, with the increasing strictness of environmental regulations and the continuous improvement of requirements of consumers on fuel economy and safety performance, the weight reduction of automobiles has become an irreversible trend. The light weight can reduce carbon emission, improve the driving mileage and improve the operability and safety of the vehicle. Aluminum alloys have become a popular choice for body panel materials due to their high specific strength and excellent formability, and have found increasing use in particular in engine hoods, side panels, vehicle doors, and the like. In the existing design flow, a plurality of design processes are mutually independent and lack of closed loop connection. On one hand, the building of the material constitutive model is often based on a simplified assumption, and complex dynamic mechanical behaviors of the material under high strain rate are ignored, so that a large deviation exists between a simulation result and a physical test. On the other hand, structural optimization is often focused on static performance, but fails to adequately account for dynamic energy absorption characteristics during actual impact, which limits performance improvement of the cover in terms of impact safety. The current design is also based on experience, resulting in higher design costs for the hood. Disclosure of Invention The application mainly aims to provide a method for determining parameters of an engine hood, a device for determining parameters of the engine hood, the engine hood and a vehicle, so as to at least solve the problem that the design cost of the engine hood is high in the prior art. In order to achieve the above object, according to one aspect of the present application, there is provided a method for determining parameters of an engine hood, comprising obtaining design parameters of an engine hood, wherein the design parameters include one or more of a material brand, a thickness distribution, a reinforcement shape, a reinforcement number, a reinforcement distribution, a hollowed-out area shape, a hollowed-out area number, and a hollowed-out area distribution, calculating an absorption energy value of the engine hood corresponding to the design parameters, and calculating a collision loss value of the engine hood corresponding to the design parameters, wherein the absorption energy value is a kinetic energy value of absorption of the engine hood corresponding to the design parameters in case of a collision, the collision loss value is a stress value received by a target object in case of a collision, and optimizing the design parameters by using a multi-objective optimization algorithm until the absorption energy value reaches an energy maximum and the collision loss value reaches a minimum value, thereby obtaining updated design parameters, wherein the updated design parameters are used for constructing the engine hood. Optionally, optimizing by adopting a multi-objective optimization algorithm, and adjusting the design parameters until the absorption energy value reaches an energy maximum value and the collision loss value reaches a loss minimum value to obtain updated design parameters, wherein the method comprises the steps of adopting the multi-objective optimization algorithm to adjust the design parameters as variables for a plurality of times, and obtaining the absorption energy value and the collision loss value after each adjustment of the design parameters; extracting the maximum value of the absorption energy values after the design parameters are adjusted, extracting the minimum value of the collision loss values after the design parameters are adjusted, and extracting the adjusted design parameters corresponding to the maximum value of the absorption energy values and the minimum value of the collision loss values to obtain the updated design parameters. The method comprises the steps of selecting a design parameter as a variable, carrying out multiple adjustment by adopting the multi-objective optimization algorithm, obtaining the absorption energy value and the collision loss value after each adjustment of the design parameter, simulating a strain value of a material corresponding to a material brand by adopting a Johnson-Coulomb model, constructing a finite element model of an engine hood by adopting the design parameter, obtaining an engine hood model, carrying out multiple adjustment on the design parameter in the engine hood model by adopting the multi-objective optimization algorithm based on the simulated strain value of the material, and obtaining the absorption energy value and the colli