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在前期研究成果的基础上,首先对CFRP受电弓导流罩的气动噪声机理进行了分析;然后,基于降噪理论,选取了9个噪声监测点,对CFRP受电弓导流罩进行气动噪声数值模拟,对比分析了两种不同方案的导流罩结构在100~8 000 Hz声压级下不同的测点声压级、1/3倍频程声压级和1/3倍频下A计权声压级,研究结果表明:低频段区域,导流罩结构B和导流罩结构E噪声水平相差不大;高频段区域,导流罩结构E的降噪效果整体上优于导流罩结构B。基于该文的研究方法设计出的低噪声CFRP受电弓导流罩结构对未来导流罩的工程化运用具有一定的指导意义。
Based on the previous research results, the aerodynamic noise mechanism of the CFRP pantograph shroud was analyzed firstly. Then, based on the theory of noise reduction, nine noise monitoring points were selected and the CFRP pantograph deflector was pneumatically Noise numerical simulation. The sound pressure level at different sound pressure levels of 100-8000 Hz, the sound pressure level of 1/3 octave and the third octave frequency A weighted sound pressure level.The results show that there is not much difference in noise level between the structure of the shroud B and the structure of the shroud in the low frequency range and the noise reduction effect of the structure E in the high frequency region is better than that of the guide Baffle structure B. The low noise CFRP pantograph shroud structure based on the research method of this article is of guiding significance for the engineering application of the future shroud.