TY -的A2 -吴,长治盟——太阳,小琪AU -肖,汉族PY - 2018 DA - 2018/03/20 TI -数值模拟和调查在高速列车受电弓的气动噪声特征SP - 6932596六世- 2018 AB -高速列车受电弓是重要的设备。列车在高速运行时,凹凸部分火车造成严重的气流扰动,导致流动分离、涡脱落,崩溃。一个强大的波动将引起压力场和转换成气动噪声。当高速列车达到300 km / h,气动噪声成为主要噪声源。气动噪声的受电弓在远场中占据很大一部分空气动力噪声的火车。因此,受电弓突出的气动噪声问题在许多空气动力学问题。本文应用分离涡模拟(DES)周围的流场进行数值模拟的高速列车受电弓运行在露天。时域特征、频域特征和非定常流场的空气动力噪声得到了受电弓。声学边界元法用于研究受电弓的噪声辐射特性。结果表明,与不同的旋转方向和不同尺度的涡流等地区受电弓头,铰链关节,底部框架,和绝缘体,而更大的漩涡在受电弓头和底部框架。 These eddies affect fluctuation pressures of pantographs to form aerodynamic noise sources. Slide plates, pantograph heads, balance rods, insulators, bottom frames, and push rods are the main aerodynamic noise source of pantographs. Radiated energies of pantographs are mainly in mid-frequency and high-frequency bands. In high-frequency bands, the far-field aerodynamic noise of pantographs is mainly contributed by the pantograph head. Single-frequency noises are in the far-field aerodynamic noise of pantographs, where main frequencies are 293 Hz, 586 Hz, 880 Hz, and 1173 Hz. The farther the observed point is from the noise source, the faster the sound pressure attenuation will be. When the distance of two adjacent observed points is increased by double, the attenuation amplitude of sound pressure levels for pantographs is around 6.6 dB. SN - 1076-2787 UR - https://doi.org/10.1155/2018/6932596 DO - 10.1155/2018/6932596 JF - Complexity PB - Hindawi KW - ER -