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With a long history of thousand years,conventional Chinese acupuncture treatment has been used worldwide as an important......
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该文从纸机设备频谱分析入手，对真空辊工作原理及噪声产生机理进行分析，确定真空伏辊破真实噪声是抄纸机主噪声源。......
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阐述了频谱分析方法,并采用快速富里叶变换(FFT)算法对Y38A滚齿机的传动误差进行了频谱分析,得出了传动误差的富里叶频谱,结果表明......
