Abstract
因為接點對於整體結構之動態特性影響非常大, 所以要有一個能夠準確鑑別出接點參數的方法是必要的。本論文主要在改善參考文獻【10】、【11】的方法，因為其方法可直接利用量測而得之頻率響應函數來鑑別接點參數, 所以是一個具發展性之方法。本論文利用了加權的觀念來使得量測數據能夠充份的利用；並導出整體結構頻率響應函數對接點參數的靈敏度,利用靈敏度的觀念來選擇取用頻率, 以使得鑑別結果能達到完善。最後並討論到, 若在所考慮的頻率範圍內, 靈敏度皆太小, 則必須利用改變結構的狀態讓在所考慮的頻率範圍內, 靈敏度做整體性的提高。Owing to the characteristics of joints with decisive effects ona structure, it is necessary to have a method to identify theparameters of joints precisely. In this paper,we mainlyimproved the method on Ref.【10】、【11】 . Because that it canidentify the parameters of the joints by directly measuring thefrequency response function of a struc- ture, the above-mentioned method is expensive. We employed the concept ofweighting to make use of the experimental data suff- icientlyand derive the relationship of the frequency response functionof a structure and the sensitivity of the parameters of thejoints. With the aid of the sensitivity of the parameters ofthe joints, we can choose the frequency correctly and make theresults of identification of a structure precisely. Thecondition of a structure with a low sensitivity have to bechanged. The method of promoting the sensitivity within therange of frequency which we are concerned are discussed in thispaper.