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该文利用计算机库存中的 RND(X)函数,产生白噪声信号,通过设置滤波器的传递函数,从频域、幅值域等效角度出发,模拟任意给定的随机载荷,作为实验室台架模拟的激励载荷。分析了该方法的实用性,阐述了零相位数字递归滤波器的设计方法、计算机程序设计步骤。通过将正弦信号、白噪声信号输入滤波器,获得给定功率谱密度之输出信号的试验,证明了零相位数字递归滤波器设计的正确性。
This paper uses the RND (X) function in computer inventory to generate white noise signal. By setting the transfer function of the filter, a given arbitrary random load is simulated from the perspective of frequency domain and amplitude domain. Simulation of the excitation load. The practicality of this method is analyzed. The design method of zero-phase digital recursive filter and the steps of computer program design are described. The experiment of obtaining the output signal of a given power spectral density by inputting sinusoidal signal and white noise signal into the filter proves the correctness of the design of the zero-phase digital recursive filter.