创造低噪声的乘车环境,建立减振降噪环境友好型的地铁站区环境已成为轨道交通建设的发展趋势。测试分析一种陶粒混凝土制作的新型吸音结构HCM型吸声板的降噪效果。试验在北京交通大学轨道减振与振动控制实验室中进行,将吸声板铺设在轨...创造低噪声的乘车环境,建立减振降噪环境友好型的地铁站区环境已成为轨道交通建设的发展趋势。测试分析一种陶粒混凝土制作的新型吸音结构HCM型吸声板的降噪效果。试验在北京交通大学轨道减振与振动控制实验室中进行,将吸声板铺设在轨道的钢轨之间,在道床和隧道壁上布置测点,模拟干燥、潮湿、下雨以及潮湿后干燥的工况进行试验测试。分析结果表明：不同测点和工况下,减噪效果都能达到4~5 d BA;频域分析表明,吸声板具有较宽的降噪频段。对于隧道壁测点,吸声板对250 Hz以上频段噪声的降噪效果较优;对于道床测点,吸声板对500 Hz以上频段噪声的降噪效果较好。展开更多
Noise-reduction seats have been successfully used in concert halls, theaters, and other places that reduce noise. In this study, a new noise-reduction seat design was proposed for high-speed trains, which have unique ...Noise-reduction seats have been successfully used in concert halls, theaters, and other places that reduce noise. In this study, a new noise-reduction seat design was proposed for high-speed trains, which have unique interior noise spectral characteristics. First, before the noisereduction seat models were fabricated, the parameters of high-performance sound-absorbing materials and perforated plates were selected by conducting a standing-wave tube test. The sound-absorption effects of the noisereduction seats and normal seats were investigated and compared in a reverberation chamber. Test results showed that, compared with normal seats, the noise-reduction seats obtained a significantly improved sound-absorption coefficient in the entire frequency band. Furthermore, the test results were used to establish a simulation model for calculation, and the simulation results proved that the noise-reduction seats substantially reduced the noise in an entire train car. Finally, the noise-reduction seats were fabricated and installed in a full train car of an actual highspeed train. The test results showed that, compared with the normal seats, the noise-reduction seats decreased the noise level at a standard point in the passenger car by 1.5 dB. Therefore, the noise-reduction seats are effective in noise reduction.展开更多
文摘创造低噪声的乘车环境,建立减振降噪环境友好型的地铁站区环境已成为轨道交通建设的发展趋势。测试分析一种陶粒混凝土制作的新型吸音结构HCM型吸声板的降噪效果。试验在北京交通大学轨道减振与振动控制实验室中进行,将吸声板铺设在轨道的钢轨之间,在道床和隧道壁上布置测点,模拟干燥、潮湿、下雨以及潮湿后干燥的工况进行试验测试。分析结果表明：不同测点和工况下,减噪效果都能达到4~5 d BA;频域分析表明,吸声板具有较宽的降噪频段。对于隧道壁测点,吸声板对250 Hz以上频段噪声的降噪效果较优;对于道床测点,吸声板对500 Hz以上频段噪声的降噪效果较好。
文摘Noise-reduction seats have been successfully used in concert halls, theaters, and other places that reduce noise. In this study, a new noise-reduction seat design was proposed for high-speed trains, which have unique interior noise spectral characteristics. First, before the noisereduction seat models were fabricated, the parameters of high-performance sound-absorbing materials and perforated plates were selected by conducting a standing-wave tube test. The sound-absorption effects of the noisereduction seats and normal seats were investigated and compared in a reverberation chamber. Test results showed that, compared with normal seats, the noise-reduction seats obtained a significantly improved sound-absorption coefficient in the entire frequency band. Furthermore, the test results were used to establish a simulation model for calculation, and the simulation results proved that the noise-reduction seats substantially reduced the noise in an entire train car. Finally, the noise-reduction seats were fabricated and installed in a full train car of an actual highspeed train. The test results showed that, compared with the normal seats, the noise-reduction seats decreased the noise level at a standard point in the passenger car by 1.5 dB. Therefore, the noise-reduction seats are effective in noise reduction.
