Structure Analysis Of Straddle Type Monorail Vehicle Body

Straddle-Type Monorail vehicle body is mainly responsible for two functions of carrying passengers and installing various electrical equipment. It should have sufficient strength, stiffness and dynamic properties, to meet the transportation requirements and ensure the passengers'safety and comfort.To minimize power consumption when the vehicle is running,it should also minimize the weight. In addition, to ensure the safe operation of the body in a given period, it also called for the need to achieve the required fatigue life. Therefore, it is necessary to analyze and optimize the Straddle-Type Monorail vehicle body structure.In this paper, it is the first time to make the Straddle-Type Monorail vehicle body structure as the research object at home, using modern CAE technology, research was carried out as follows:1) The features of the body structure were analysed.Based on the three-dimensional geometric model of the Straddle-Type Monorail vehicle body,the finite element analysis model was established by using two-dimensional plate elements.2) Against the operational characteristics of Straddle-Type Monorail vehicles, typical loading conditions were determined and selected.The body static strength was analysed,and the stress and deformation distribution of the body was received.Then, in accordance with the relevant standards, body structure strength and stiffness were evaluated.3) The body structure modal analysis was conducted on,and the natural frequency and vibration mode of it was obtained.4) According to the finite element analysis stress results, the fatigue properties of the material and the load spectrum,the fatigue life analysis of body was conducted.The calculations result show that the fatigue life of the body is 20.4 years.5) Through the body structure strength, stiffness, modal and fatigue analysis, structural improvement proposals were proposed, and the feasibility of the improvement program was verified.6) An optimum design was attempted by using the thickness of body components as design variables,using the minimization of body mass as objective function,using the stress of body components as constraints.