Simulation And Improvement Of The Superstructure Of Bus Rapid Transit System (BRT)

With the increasing number of vehicle, the energy shortage，the high cost ofenergy, traffic congestion, air pollution has been raised. The Rapid Transit System isinternationally recognized as effective means of responding to the traffic problems.Both developed and developing countries have begun to pay attention to the RapidTransit System. The Rapid Transit Buses usually have two parts which are generallyconnected by the hinged device. When rollover accident occurs, as the buses have alarge container, it will be a big disastrous. Thus, it’s important to study the bodystructure strength and the roller collision performance of Bus Rapid system (BRT).This paper discusses the importance and the specific research methods ofstudying vehicle rollover safety, analysis the research situation of domestic andforeign, describes the common safety regulations. First，skeleton’s geometric modelwas established inside the VPG software based on drawing of BRT. In order toconsider the side collision, coach’s outer covering was established. Beam and Solidelement were used. According to GB-T17578-1998"Provisions of strength for thesuperstructure of bus", the passenger train tumbling crash test of BRT was simulatedwith finite element method. Through the Explicit dynamic method, analyzed coach’sdistortion situation, energy change curve and the curve of acceleration. Secondly, theother two common vehicle rollover accidents was simulated with finite elementmethod. Then the crashworthiness performance of BRT was analysis according to thecalculation results.Then the BRT structure was improved based on the calculation results. Thenew skeleton’s geometric model was established in UG software. In order to save time,the frame strength of new skeleton was analysis in Abaqus to ensure the improvementis reasonable. At last, the passenger train tumbling crash test of BRT with newskeleton was simulated in LS-DYNA. Then the crashworthiness performance of BRTwas analysis based on the comparison of results to ensure the improved method canbe reference.