提出了結構動態試驗傳感器測點位置的優化方法, 發展了基于有限多個傳感器測點信息的結構破損定位方法。該方法以結構各自由度的破損信息為條件, 通過優化方法從結構的全部自由度中去掉那些所含結構破損信息很少的自由度, 得到了有限個傳感器測點的數目和位置, 并且運用靈敏度分析和相關性分析方法,建立了直接利用不完整的實測模態振型診斷結構破損位置的破損定位方法, 解決了測試振型不完整給結構破損診斷帶來的困難。空間桁架結構破損診斷的實驗研究表明, 該方法能成功地診斷出結構單個或多個破損的位置。
關鍵詞: 破損診斷; 振動; 模態分析; 系統識別; 測點優化
Abstract: A method of op t im izing senso r p lacement in the st ructural dynam ic test and localizing st ructural damage from lim ited senso r info rmat ion in a st ructure is p resented in th is paper. The senso r p lacements are op t im ized acco rding to the ability of co llect ing st ructural damage info rmat ion fo r each degree of freedom (DO F) of the st ructure. O nly a lim ited number of st ructuralDO F including p lent iful damage info rmat ion are inst rumented. Incomp lete mode shapes yielded from these lim ited senso r p lacements are direct ly used to lo2 calize st ructural damage so that the incomp leteness of experimentalmode shape to block the development of st ructural damage detect ion is so lved. Experimental research show s that the p ropo sedmethod can be success2 fully used to localize single o r mult ip le damages on the th ree2dimension t russ st ructure.
Key words: damage detect ion; vibrat ion; modal analysis; system ident ificat ion; op t imal senso r p lacement