Analysis And Optimization Of Collision Between Vehicle And Semi-rigid Double-wave Beam Guardrail Based On LS-DYNA

With the rapid development of China and the automobile industry,people are aware of comfort,but at the same time,traffic accidents are increasing.Semi-rigid double shaft beam guard rails are widely used and play an important role on Chinese highways.Therefore,improving the collision prevention performance of conventional wave beam guard rails by studying the collision mechanism of semi-rigid double-wave beam guard rails of general vehicles and optimizing the roadmap can effectively reduce the severity of the incident.This is a resource as well as an actual resource.According to the crash test criteria,a 1.5 ton car was selected as the crash test model and a semi-rigid twin-shaft beam guardrail model was created using CAD3 D software for a specific section of the Beijing-Hong Kong-Macau expressway.The guardrail and the vehicle model were preprocessed by finite element analysis in Hyper Mesh in order to build the guardrail and the vehicle.Import the software coupling system LS-DYNA with three collision speeds of 80 km / h,100 km / h and 120 km / h for the simulation of guard rails and vehicle collisions as well as LS-Pre Post for post-processing of the vehicle body.The guardrail is maximized by synthesizing the acceleration of the guardrail.A comparative analysis of the collision avoidance performance of the guardrail and the safety performance of the occupant was carried out from the point of view of dynamic deformation,energy absorption of the guardrail and the change in vehicle speed.The rating index exceeded the safety performance of the motorway guardrail.The limit values set by the evaluation criteria do not guarantee the safety of the occupants,so that the safety performance of the guard rails must be improved.Vertical double beam guardrail structure for the theoretical analysis of this phenomenon,studying the cause of trigger resistance,optimizing the design of conventional guardrails,and improving the collision avoidance performance and occupant safety performance of guardrails.Proposed.Based on the principle of economy,we will study the height of the middle and lower bars of the vertical double bar.The second optimization scheme suggests building a conventional double corrugated beam guard rail pillar and a rubber-filled anti-lock block.Safety and economic principles determine which parts need to be filled.The optimized guardrailsof the two schemes and the conventional wave beam guardrails are each subjected to a collision simulation under the same conditions for comparison and analysis.The results show the blocking effect and protection of two optimized guard rails.Indicators such as trunk and occupant capacity are optimized based on existing guard rails without changing structural parameters,are easy to implement,economical and rational,and of value for certain technical applications.Using an orthogonal test set-up,we investigated the influence of the guardrail shape,the corrugated beam thickness,the column thickness and the anti-lock thickness on the safety performance of a collision system for guardrails.We determined the optimal combination of parameters and found that this effectively avoided or reduced the structure size.Optimize the control panel with the traditional control panel,and the parameters selected through orthogonal tests have changed the size of the guardrail structure.This will be a reference for future guard rail optimization designs.