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本文以有限富氏变换为基础,讨论了多点随机激励频响函数估计的一般原理和各种可能的激励方案。提出了重叠取样的数据处理方法,以充分利用有限记录所包含的信息,提高估计精度。在微机PDP-11/23系统上编制了可用于多达6点激励的数据采集-数据处理-频响函数估计的功能较强的软件,可用于4种工作方式:(1)连续随机,(2)周期随机,(3)瞬态随机,(4)全相干激励。在自由-自由梁和玻璃钢蜂窝结构直升机尾桨上进行了试验研究。对连续随机激励进行了重叠取样处理,结果表明该方法切实可行。
In this paper, based on the finite Fourier transform, the general principle of multi-point random excitation frequency response function estimation and various possible incentive schemes are discussed. The data processing method of overlapping sampling is put forward to make full use of the information contained in the limited record and improve the estimation accuracy. On the microcomputer PDP-11/23 system has been developed for up to 6 points of excitation data acquisition - data processing - frequency response function estimation of more powerful software can be used for four kinds of work: (1) continuous random, ( 2) periodic randomness, (3) transient randomness, and (4) full coherent excitation. An experimental study was conducted on a free-free beam and a fiberglass honeycomb structural helicopter tail rotor. Overlapping sampling of continuous random stimuli results show that the method is feasible.