Prediction And Analysis Of High-speed Train Body Panel Contribution

The Country support for the development of high speed railway, At the same time the speed of high-speed trains running constantly improve. The increase of noise inside the train greatly influences the ride comfort of passengers. This paper aims at the train due to track irregularity caused by body vibration in vehicle noise prediction analysis. Analysis train body sound pressure panel on the contribution of the field point. By improving measures to reduce interior noise.The main work of this paper as follow:1. Using LMS Virtual.Lab software to establish a simplified finite element structural model of the body, the sound of the acoustic cavity model and Acoustic solid coupling model; Modal analysis of the model derived model for solving the natural frequency and observation model vibration. Derived from the model vibration shape and natural frequency. We can know natural frequency of the Acoustic solid coupling model has relationship with structural model and acoustic cavity modal.2. Learning track irregularity overview, Using the German low interference spectrum and using Trigonometric series method to simulate the displacement time domain samples of direction track irregularity、level track irregularity and height track irregularity. Time domain simulation of the samples will be converted to the power spectrum density by cycle method and comparison with Analytical values. Finally, the track irregularity of time domain displacement sample through Fourier transform to get frequency domain displacement sample.3.Using the track irregularity of frequency domain displacement sample as input excitation. Applied to the train body through the calculation of vehicle body vibration velocity. Vibration speed data transfer to the acoustic mesh, as the acoustic boundary conditions calculated. Panel division on the acoustic boundary element mesh. Through LMS Virtual.Lab Acoustics BEM software model to ATV calculation, to get the field point sound pressure and the point of the sound pressure field contribution of each panel. 4. By changing the stiffness of the vehicle body, improve body structure of Young’s modulus value to ATV calculation. Observation point sound pressure level and panel contribution, The change in stiffness of body in the certain degree can reduce the interior sound pressure. To provide a theoretical basis for the structure optimization of reducing noise and vibration reduction.