Elastic Vibration Analysis Of High-speed Aluminium-alloy Passenger Car

Railway is one of China's most important transportation lifeline, and the high-speed passenger service is one of the most rapid, safe and comfortable mode of transport. China's newly developed high-speed passenger cars have reached a maximum speed of 350 km / h after the 6th speeding up, which puts forward higher requests to the vehicle dynamic characteristics. So the dynamical calculation and analysis is very necessary at this time.For a long time, a large number of vehicle dynamic analysis considered the carbody into a rigid body. In fact the elastic vibration of the vehicle has a direct impact on the vehicle quality. Considering the elastic deformation is the inevitable trend of vehicle dynamics and structural dynamics. With the vehicle spacing increasing, the speed improving and the widening of the frequency domain which were caused by rail and carbody factors, the vibrating acceleration increased, and then encouraged strenuous elastic vibration. The vibration directly impacted the performance of the carbody, so the elastic vibration of the carbody shouldn't be ignored. At present, few methods were given in the elastic vibration domain, so the elastic vibration analysis on the high-speed passenger car was carried out.The article utilized finite element analysis sofeware I-DEAS to build finite element model of a high-speed aluminum-alloy passenger car. considering the carbody and the bogie as elastic body meets the requirements of modern structural design. Elastic vibration characteristics of vehicle were analyzed by the modal calculation and dynamic response analysis. We came to the conclusion that the underframe and roof's stiffness is very low through the modal calculation and analysis, and the conclusion that there are different degrees of coupling vibration between vertical and transverse was gained through the analysis of vehicle's PSD response under white spectrum excitation. Vertical vibration's largest energe occurred at about 5Hz and the transverse occurred at about 11Hz. The article considered the rail irregularity and the tread abrasion excitation into simple harmonic excitation. The side wall, the underframe and the roof's vibration situation were discussed, and then the influence of vehicle's stability under the two excitation were analyzed. The basic vibration regularities gained in this paper supplied some references to the structure design and improvement.