Operation of BeijingTianjin intercity railway indicates that the “highspeed era” of Chinas railroad started. However, with the increase of the train speed the environmental vibration control along the railways has been becoming a serious problem. Therefore, the project on the groundborne vibration due to railway traffic is becoming a special concern in civil and environmental engineering. In this paper, the numerical model is set up, which consists of the vehicletrackroadbedground coupling system and the groundbarrierbuilding coupling system. The universal finiteelement software ANSYS is used to analyze the reduction effect of vibration isolation of a new style trench. The style includes trapezoid, upsidedown trapezoid, triangle, upsidedown triangle and so on. The vibration isolation effect of the new style trench is compared with that of the traditional trench. It is shown that the effect of the new style trench is better than that of the traditional trench, and the style of the trench can be properly changed to improve the effect of vibration isolation.

Constrained damping treating is made on wheel’s surface for domestic standard wheels of passenger trains. Six types of damped wheels are designed. Standard and damped wheel models are built with ANSYS and the effects of thickness of damped layer, material and thickness of constrained layer on reducing wheel vibration are analyzed respectively. Then structural loss factors of these wheels are calculated by means of FEM method. The analysis has demonstrated that if the thicknesses of the damping layer and constraint layer are larger, the vibration reduction will be more effective. The effect of vibration reduction of such damped wheels with steel constraint ayer is obviously better than those damped wheels with aluminum constraint layer. And the structural loss factors of the damped wheels are much larger than those of the standard wheels. Most structural loss factors are above 0.003 under different working conditions within the frequency range of 1500 Hz to 5000Hz.