由有限多個(gè)傳感器測點(diǎn)診斷結(jié)構(gòu)破損位置的試驗(yàn)研究

提出了結(jié)構(gòu)動(dòng)態(tài)試驗(yàn)傳感器測點(diǎn)位置的優(yōu)化方法, 發(fā)展了基于有限多個(gè)傳感器測點(diǎn)信息的結(jié)構(gòu)破損定位方法。該方法以結(jié)構(gòu)各自由度的破損信息為條件, 通過優(yōu)化方法從結(jié)構(gòu)的全部自由度中去掉那些所含結(jié)構(gòu)破損信息很少的自由度, 得到了有限個(gè)傳感器測點(diǎn)的數(shù)目和位置, 并且運(yùn)用靈敏度分析和相關(guān)性分析方法,建立了直接利用不完整的實(shí)測模態(tài)振型診斷結(jié)構(gòu)破損位置的破損定位方法, 解決了測試振型不完整給結(jié)構(gòu)破損診斷帶來的困難?？臻g桁架結(jié)構(gòu)破損診斷的實(shí)驗(yàn)研究表明, 該方法能成功地診斷出結(jié)構(gòu)單個(gè)或多個(gè)破損的位置。
關(guān)鍵詞: 破損診斷; 振動(dòng); 模態(tài)分析; 系統(tǒng)識(shí)別; 測點(diǎn)優(yōu)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