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在“应用功率谱测量振动表面声强”(刊于《噪声与振动控制》1990年第4期,以下简称“应”)文中引用了[1,2]中振动表面声强谱为质点振速与声压互功率谱的实部,测量中测量仪器两通道的相位差对测量结果有严重影响。两通道的相位差包括声传感器和加速度传感器(测振速用)的相位差和放大通路的相位差,即使两个同类型传感器,其相差也是难以控制,至于两个不同类传感器,由于原理与结构不同,其相差更是难以估计和控制。为了避开这个困难,“应”文作者用声压自功率谱G_p(ω),声压自功率谱梯度(?)G_p/(?)n(?),及振速自功率谱G_u(ω)来估算振动表面声强,这是有意义的设想。
In the article “Using Power Spectrum to Measure the Sound Intensity of Vibrations” (published in “Noise and Vibration Control”, No.4, 1990, hereinafter referred to as “Ying”), the vibration surface sound intensity spectrum in [1,2] And the real part of the power spectrum of the sound pressure, measuring the phase difference between the two measuring instruments have a serious impact on the measurement results. The phase difference between the two channels includes the phase difference between the acoustic sensor and the acceleration sensor (vibration measurement speed) and the phase difference between the amplifying paths. Even if two sensors of the same type are different, the phase difference is difficult to control. As for the two different sensors, Different structures, the difference is even more difficult to estimate and control. In order to avoid this difficulty, the authors of this paper use the sound pressure self-power spectrum G_p (ω), sound pressure self-power spectrum gradient G_p / (?) N (?), And vibration self-power spectrum G_u ) To estimate the vibrating surface sound intensity, this is a meaningful idea.