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本文介绍的研究工作,其目的是研究相干函数在以下方面的使用价值,即确定多个动态输入对装在一个真实复杂结构上的宇宙飞船组件的实测振动响应的相对影响。这项研究工作所用的数据是通过同时把振动和声激励施加于一个试验模型(一个经过改进的大力神仪器支架)上产生的。最多用到三个输入。在某些情况下,输入发生了相干。采用根据Bendat的迭代计算法建立的一种方法编写了一个数字计算机程序以分析试验数据。这种方法比原先的矩阵法简单并且节省计算工时。研究结果表明,相干函数法能够有效地识别和估计独立输入和相干输入时的激励源。本文扼要研究并讨论了由改变平均过程所需的数据样本数所产生的影响。
The purpose of this paper is to study the value of coherence functions in determining the relative influence of multiple dynamic inputs on the measured vibration response of a spacecraft component housed in a truly complex structure. The data for this research work was generated by applying vibration and acoustics simultaneously to a test model, an improved Hercules instrument holder. Use up to three inputs. In some cases, the input is coherent. A numerical computer program was developed to analyze the experimental data using a method established by Bendat’s iterative method. This method is simpler than the original matrix method and saves computational man hours. The results show that the coherence function method can effectively identify and estimate the excitation sources when independent input and coherent input. This article concludes by examining and discussing the impact of varying the number of data samples needed to change the averaging process.