A simulation analysis method of engine hatch cover shaking based on air pressure load

Abstract

The invention discloses a method for simulating and analyzing vibrations of an engine compartment cover based on air pressure loads, which builds a model based on finite element calculation software, establishes an accurate finite element model of an automobile engine compartment cover, and extracts the inner side of the engine compartment cover outer plate and the air pressure distribution on the outer side, and project it on all the units of the outer panel of the engine compartment cover by means of unit pressure mapping, as the air pressure load for the simulation analysis of engine compartment cover shake, which greatly improves the calculation of the model Accuracy can accurately predict the experimental results and judge whether the engine compartment cover meets the design requirements of vibration performance, which is very helpful to save the cost of prototype vehicles and greatly improve the efficiency of automobile research and development. Using the air pressure load-based engine hatch shake simulation analysis method of the present invention can efficiently and cost-effectively verify various engine compartment cover design schemes through the finite element simulation method, so as to optimize various virtual schemes.

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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