Based On The Finite Element Mehtod Of Rail Vibration Testing Research

China Railway is one of the main means of transportation. As the train speed increasing with the development of national economy, the train also will increase the vibration, and determine its corresponding noise characteristics. Vibration and noise, which are determined by vitration frequency and intensity of influence, are the same physical phenomenon of elastic wave propagation in two aspects.The subject in the study of rail noise and vibration based on the combined use of finite element analysis software ANSYS to establish in the frequency domain wheel, track and rail vertical dynamic coupling of finite element model. The simulation results indicate that the proposed algorithm is quite effective and provide scientific, the original measured data of the study of the irregularity of the rail, rail life and to determine the rational design of anti-vibration noise reduction measures.The finite element model of the rail modal analysis, we can get the sensitive of the vibration of the rail by analyzing the vibrational radiation characteristics of ballastless track. Taking the vertical coupling of the ballastless track rali into analysis object, we can build rail subsystem and the rail vertical coupling system of a series of mechanical model. Researching the calculation precision and the application scope of different rail models. Analysing the ballast track rail vertical system coupled vibration and acoustic radiation chaaracteristics.The research object of this thesis is ballastless track, the rail vibration and the radiation noise as a result of the stress and the plastic strain changing with the transformation of the load, the dynamic load and the constraints. Through simulation, the rail dynamic flexibility and vibration attenuation rate of the finite element model are better than the analytic beam model with regard to dual block ballastless track. For ballastless slab track, the numerical simulations results show that the support structures under the rail pad have little effects on rail vibratory response. The influences of the design parameters of the slab and supportive components are main concern on slab vibratory response. With the differences in amplitude and phase of the wheelset loads taken into consideration, the effects are mainly limited on the response of the slab due to the great stiffness of mortar layer underneath the slab.The radiation noises of both tracks are predicted, and by using the established models. The validity of this model is proved in this article perfectly by compared withe the existing wheel-rail noise model TWINS (Track-Wheel Interaction Noise Software). At last finding some effectively control measures from the noise source and the route of transmission of noise. The conclusion of the study can provide useful theoretical for engineering design and construction.