実験モード解析のための加振方法 : 第1報, 不規則連続打撃法の提案

概要

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When we measure the frequency response functions of a light and small structure by random excitation, the rotatory inertia of the exciters and the force transducers attached to the structure will influence the results of the test. On the other hand, impact testing using a hand-held hammer can avoid the influence caused by fixing the exciters to the structure, but this method doesn's work well on a nonlinear system, and it is also impossible to use in multiple-input excitation. in this paper, a new excitation technique is proposed which uses electrodynamic exciters as impact hammers and randomly generated impulses as driving signals. Comparing the results obtained by the new technique and by the usual method of random excitation shows that, in the case of single-input excitation, the new technique is more reliable. Furthermore, in the case of multiple-input excitation, the correlation between the excitation forces of the new technique is decreased so much, that the accuracy of the measurements must increase.
一般社団法人日本機械学会の論文
1989-01-25