Analysis And Optimization Of Rear-end Collision Of Hydrogen Fuel Cell Passenger Cars

As the main mode of highway passenger transport,passenger cars are developing towards the direction of energy saving and environmental protection.Hydrogen fuel cell bus is a kind of zero-pollution vehicle.Its popularization and use can alleviate the current energy exhaustion crisis and environmental pollution caused by exhaust emissions.While paying attention to the advantages of energy saving and environmental protection of new energy buses,the safety of new energy buses cannot be neglected.A good body design can improve the anti-collision performance of the body and reduce the damage to the occupant.At present,the research on passenger car collision by various institutions at home and abroad,is more of a focus on the positive side,and offset collision of the three forms,less research on passenger car crash safety,hydrogen fuel cell bus structure have a great difference with traditional buses,installed at the top of the cylinder assembly,the rear part of the installation of a fuel cell system,so the hydrogen fuel cell bus crash analysis,explores the ways of increasing the safety of the passenger car crash,for the development of new energy bus has very important practical significance and forward-looking industry,to improve overall safety performance of passenger cars in our country.The rear-end collision of a hydrogen fuel cell bus is studied in this paper.Firstly,based on catia,the geometric model of the bus and the general layout scheme of the bus body are established,and the finite element analysis model of the bus is established in the hypermesh.Secondly,the strength,stiffness and modal analysis of the bus body frame structure are carried out under four different working conditions,and the analysis results meet the design requirements of the bus.The safety performance of the rear enclosure of passenger cars under complex conditions was further investigated.Ls-dyna was used to conduct rear-end collision analysis on thefinite element model of the collision of passenger cars.The results showed that the safety of the rear enclosure of passenger cars was insufficient.Finally,in order to improve the performance of rear-end collision of passenger cars,an optimization scheme of increasing the rear energy absorption device is proposed,and the scheme is verified by simulation analysis.The results show that the collision safety of the improved frame has been greatly improved,and the improved frame structure provides important reference value for other subsequent studies.