Engine hood jitter simulation analysis method based on air pressure load

Abstract

The invention discloses an engine hood jitter simulation analysis method based on an air pressure load. A model is built based on finite element calculation software; an accurate finite element modelof the automobile engine hood is established; air pressure distribution of the inner side and the outer side of an engine hood outer plate is extracted; the unit pressure is projected on all units ofthe engine hood outer plate in a unit pressure mapping manner; the air pressure load is used as the air pressure load of the engine hood jitter simulation analysis, the operation accuracy of the modelis greatly improved, the experiment result can be accurately predicted, whether the engine hood meets the jitter performance design requirement or not is judged, the cost of a sample vehicle is saved, and the research and development efficiency of the vehicle is greatly improved. By the adoption of the engine hood jitter simulation analysis method based on the air pressure load, various engine hood design schemes can be verified efficiently with low cost through a finite element simulation method, and therefore various virtual schemes can be optimized.

Description

technical field [0001] The invention relates to a simulation analysis method, in particular to a vibration simulation analysis method of an engine compartment cover. Background technique [0002] As global standards for pedestrian protection and vehicle fuel economy become more stringent, automakers are increasingly using Lighter non-traditional materials are used to design the bonnet to more effectively absorb crash energy, thereby reducing vehicle weight and fuel consumption. However, these flexible designs will increase the sensitivity of the car's engine hatch to air pressure loads, making the hatch more and more serious deformation and vibration problems under various road driving conditions. [0003] Since it is currently impossible to accurately predict the vibration of the engine compartment cover during high-speed driving through simulation calculations, the vibration verification of the engine compartment cover can only be evaluated subjectively through high-speed...

AI Technical Summary

Problems solved by technology

[0004] Therefore, how to efficiently and accurately predict the jitter problem of the vehicle bonnet on the expressway through simulation analysis and calculation, and conduct quantitative analysis on the jitter in the design stage, so as to strictly control the jitter performance of the hood in the early stage of design and avoid development. Optimize the cost and time cost of mold repair in the later period; and predict early whether the lift force of the hatch will cause the lock to fail when the lock of the engine hatch is in the first-level unlocked state during high-speed driving, thereby causing the risk of the hatch being lifted. It is still a challenging subject to effectively prevent testers from being accidentally injured during the test and improve the efficiency of the vehicle development process

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