Abstract
The wheel of vehicles is not pure rolling on the rail for the track irregularity, but with a small vertical and horizontal relative displacement. The relative displacement produces the wheel rail force and causes the vibration of the wheel and rail, which is transmitted to the air and produces noise. Therefore, it is of great significance to study the wheel's vibration and sound radiation under the track irregularity conditions. In this paper, the wheel-rail coupling dynamic analysis model of metro vehicle was established by using UM software and was researched by numerical calculation method, the wheel-rail contact force under irregularity excitation was obtained. Then the acoustic calculation model of the rigid wheel and the resilient wheel was established. Combined with the structural finite element method and the acoustic boundary element method, the structural response obtained by transient dynamic analysis was used as the boundary condition to study the acoustic radiation characteristics and the noise reduction effect of the resilient wheel. The study results show that under the vertical excitation of wheel-rail, compared with rigid wheel, the use of resilient wheel can inhibit the vibration for rim, tread and web. The vibration acceleration attenuation of the web is most significant, from 97m/s2 to 58m/s2. It is because of the vibration reduction function of the rubber body for the resilient wheel. The sound power level of the resilient wheel has a slight increase in the low frequency range and has a slight decrease in the high frequency range, in the whole calculated frequency range the sound power level of the resilient wheel decreases by 10.1 dB. These provide a good reference for the resilient wheel application in metro vehicle.
Highlights
Rail vehicle has become one of the most effective means to alleviate urban congestion by virtue of its strong passenger transport capacity and convenience
It is generally believed that the wheel-rail contact force caused by track irregularity and special operating conditions causes the structural vibration of the wheel structure and track structure, which propagates in the air to produce wheel-rail noise [2]
It can be seen from figure 11 that the sound radiation of the wheel is mainly concentrated in medium and high frequency range, regardless of whether it is rigid wheel or resilient wheel
Summary
Rail vehicle has become one of the most effective means to alleviate urban congestion by virtue of its strong passenger transport capacity and convenience. Jianhui Tian et al.: Analysis of Vibration and Sound Radiation Characteristics of Resilient Wheel in Metro factor of the wheel, and if the Modal damping ratio exceeds 0.007, it can effectively suppress curve whistling noise [7]. Liu et al study the effect of rubber properties on the vibration and noise reduction of resilient wheel, and find that increasing the elastic modulus and damping loss factor of rubber material are beneficial to reduce the vibration and noise of wheel [10]. Wen et al establish the vehicle-track coupling system model of resilient wheel and study the vehicle running stationary and curve passing, and find that the radial and axial stiffness of elastic elements can be matched reasonably to obtain better dynamic performance [11]. The hybrid numerical simulation model of the finite element and boundary element for resilient wheel is established to obtain the sound power level
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