충격 햄머 실험에서 다자유도 주파수 응답 스펙트럼의 개선

An Enhancement of Multi-Dof Frequency Response Spectrum from Impact Hammer Testing

The spectrum of impulse response signal from an impulse hammer testing is widely used to obtain frequency response function(FRF) of the structure. However the FRFs obtained from impact hammer testing have not only leakage errors but also finite record length errors when the record length for the signal processing is not sufficiently long. The errors cannot be removed with the conventional signal analyzer which treats the signals as if they are always steady and periodic. (omitted)