智慧型無線感測監控系統平臺建構與其在土木結構診斷應用之研究-子計畫:無線感測於微動量測之應用及系統識別技術開發(I)

Abstract

無線監測系統為目前監測系統之發展主流之一。無線監測系統優於傳統有線監測系 統，最明顯者為佈置省時，而且監測系統每一頻道（channel）之單價較低。針對土木工 程之監測所需而發展特定無線監測系統是本整合案之主要目標。 本子計畫為三年期計畫，第一年旨在改裝本系已擁有之微動量測系統(日本東京測 振之SPC-51)為無線量測系統，並且發展一套在小波域配合ARV 模式之系統識別法；第 二年則應用第一年之研究成果至現地微動量測，所要量測之結構物有二：一為國家同步 幅射中心新建之光子源結構，另一為高屏溪斜張大橋：此兩結構均夠大，使得用傳統量 測系統佈線很耗時◦第三年則是應用本整合案欲發展之無線監測系統於結構物振動台試 驗，並發展一套結合小波轉換及次空間法之系統識別法，再利用子結構之觀念判別結構 物之破壞樓層。將於國家地震工程研究中心進行四組8 層樓鋼構架之振動台試驗；其中 兩組為對稱構架，另兩組為非對稱構架。透過對不同樓層之柱進行切削或換比較軟之 柱，以折減對應樓層的勁度。各組鋼構架將進行線性及非線性試驗◦本子計畫將以所研 發之方法分析試驗數據，識別模態參數與損傷樓層。值得一提者，本子計畫所研發之分 析方法均將先處理數值模擬反應以確認其可行性與正確性，其中亦將考慮噪訊及不完全 量測之效應◦

Wireless monitoring becomes an attracting research theme in recent years as a promising technology that could greatly impact the field of structural monitoring and infrastructure asset management. A wireless monitoring system is usually superior to a traditional monitoring system that has cables connecting its sensors and data acquisition system when the cost and labor on setting up a monitoring system are concerned. The main purpose of the whole project consisting of several subprojects is to develop a wireless monitoring system specializing in applications of civil engineering. This subproject is a three-project. In the first year, a traditional ambient vibration measuring system (SPC-51) will be modified so that it can be operated wirelessly. Furthermore, an efficient identification approach will be proposed for processing ambient vibration responses by combining the continuous wavelet transform or stationary wavelet packet transform with ARV model. In the second year, in-situ ambient vibration tests will be carried out for the new constructed building of Taiwan Photon Source in National Synchrotron Radiation Research Center and the Kao Ping Hsi cable-stayed bridge. The identification approach proposed in the first year will be applied to process those ambient vibration responses to identify the dynamic characteristics of the structures. In the third year, the wireless monitoring system proposed in the group of projects will be applied to monitor the responses of structures in shaking table tests. Four eight-story steel frames will be constructed for shaking table tests conducted in the National Center for Research on Earthquake Engineering. Two of them are symmetric frames and the others are non-symmetric frames. The columns at some stories will be sliced to reduce the corresponding story stiffness. Linear and nonlinear tests will be conducted for each frame. A new approach combining the wavelet transform with a subspace technique will be developed to process these dynamic responses to locate the damaged stories. Notably, numerically simulated responses will be processed first to confirm the validity and demonstrate the applicability of the proposed methods. Besides, the effects of noise and incomplete measurement on the efficiency of the proposed methods will be also investigated.