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以有限富氏变换为基础,研究多输入-多输出频响函数估计的一般原理。讨论了各种可能的输入形式,其中确定性信号输入是一种新方法。它在试验时间、数据采集和处理量、识别精度等方面都比目前流行的随机输入要好;硬件配置也较简单,甚至可以只用双通道FFT分析仪来实现。 以上述理论为基础发展了在PDP11/23微机上运行的6输入-多输出频响函数估计程序,可以选择4种工作方式:(1)确定性;(2)周期随机;(3)瞬态随机;(4)连续随机激励。在自由-自由梁和直升机尾桨等实物上的实验应用成功。结果表明,采用确定性输入最好。
Based on the finite Fourier transform, the general principle of multi-input-multi-output frequency response function estimation is studied. Discussed a variety of possible input forms, of which deterministic signal input is a new approach. It is better than the current popular random input in terms of test time, data acquisition and processing capacity, recognition accuracy, etc .; the hardware configuration is also relatively simple, and even can only be achieved using dual-channel FFT analyzer. Based on the above theory, a 6-input multi-output frequency response function estimation program running on a PDP11 / 23 microcomputer has been developed. There are four operating modes that can be selected: (1) deterministic; (2) periodic random; (3) Random; (4) continuous random incentives. In free - free beam and helicopter tail rotor and other physical experiments successfully. The results show that the best deterministic input.