Vehicle frontal collision finite element model rapid-matching method

Abstract

The invention provides a method in the field of automobile computer aided design, particularly a vehicle frontal collision finite element model rapid-matching method. In the method, based on the conventional method, a process of establishing a reverse finite element model is added, and reverse and positive related parameters in a simulation process are compared to rapidly determine a critical area determining matching accuracy in the model; and then a conventional modeling method is performed, and a positive model is regulated by utilizing parameter values of the critical area obtained by the comparison between the reverse and positive related parameters so as to be rapidly matched well. By the method, the designing period of a vehicle frontal collision finite element model is effectively shortened, and the designing accuracy is relatively higher.

Description

technical field [0001] The invention designs a method in the field of automobile computer-aided design, in particular a method for quickly matching a vehicle frontal collision finite element model. Background technique [0002] In recent years, the number of cars in my country has increased significantly, which has led to a substantial increase in the density of vehicles on the road; on the other hand, with the continuous improvement of various infrastructures, such as the construction of large-scale expressways, the speed of vehicles is also faster than in previous years. It is much higher, which has caused frequent car accidents. For this reason, the country has formulated relevant laws and regulations to make requirements for car safety, such as GB 11551-2003, and some semi-official organizations such as C-NCAP also do random spot checks on vehicles. Carry out crash tests, and then announce its safety performance to consumers. The safety performance of vehicles is now rega...

AI Technical Summary

Problems solved by technology

However, the main factors affecting the frontal collision of the vehicle generally include the type of longitudinal beam material, the thickness of the longitudinal beam, the performance of the engine bolts (whether it breaks in the collision, the time of breaking), the performance of the mounting bolts of the sub-frame (they will generally break in the collision) , its fracture time), material type, and thickness generally have 2-4 ranges of variation, such as ordinary high-strength steel, dual-phase steel, or TRIP steel, and the variation range of bolt fracture time will be very wide, it may be broken, or it may be Continuously, the time may be from 0 mm to the late stage of the collision. If each change of these parameters is simulated once, and then the combination relationship between these parameters is considered, it will be very large data, (only the bolt fracture time from 0 to 120 milliseconds, if it is accurate to milliseconds, there are 120 possibilities), vehicle collision simulation has a high demand for computer hardware, and the simulation calculation time is long. Generally, a frontal collision model with 1 million units uses a computer with 4CPU and 4G memory. more than 16 hours at a time

Using this technical solution, there is no key point. Often due to the wide range of parameters considered, the number of cycles required is large, the duration of the matching process is too long, and a model that matches well with the test cannot be obtained, the engineer has to reduce the matching accuracy requirements. And enter the next design link, which leads to the subsequent simulation design accuracy is not high

Therefore, the test period of the current technical scheme is long and the accuracy is not high

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