Study On Collision Analysis And Lightweight Of Front Underrun Protective Devices For Commercial Vehicles

In the face of the increase in traffic accidents in China,in order to prevent the frequent occurrence of heavy casualties caused by Passenger cars are drilled into commercial vehicles.it has formulated the regulations of the former protective equipment GB26511 with reference to the European regulations ECE R39.After 2015 the production of commercial vehicles need to assemble the front underrun protective devices,at the same time to meet the collision performance.Combined with the national lightweight technology strategy,in response to the call of the world's energy-saving emission reduction,to develope both to meet the impact performance,but also to meet the needs of lightweight front underrun protective devices has become one of the key research.The author of the "Front underrun protective devices lightweight" this project was carried out in the graduate work phase in Dongfeng Co.,Ltd.Commodity Research InstituteIn this paper,based on Dongfeng Co.,Ltd.commercial vehicle to build the front underrun protective devices finite element finite element model,through several of the steel and composite tensile test,get its accurate material properties.The collision analysis was carried out production of front underrun protective devices,found that the collision performance does not meet the regulatory requirements.By changing its material composition and structural arrangement to improve the impact performance and achieve lightweight targets.The results of collision analysis show that the improved design is 46% less than the original design,and the collision performance is better than the original design,which meets the requirements of regulations.By comparing two different optimization methods(adaptive response surface method and global response surface method),the collision analysis was carried out using Hyperstudy on the improved Front underrun protective devices.in order not to change the contact force as a constraint and the minimum quality for the target to perform size and shape optimization,getting a new better lightweight results,The optimized Front underrun protective devices were 15.4% heavier than the previously improved structure.The research in this paper helps Dongfeng Co.,Ltd.to develop excellent Front underrun protective devices and improve the competitiveness of the products.At the same time as GB26511 is the new national regulatory requirements,the domestic research is not too much.In this paper,the collision analysis and optimization process of the Front underrun protective devices provide the idea and experience for the design of the Front underrun protective devices and help its development have theoretical and practical significance.