Damaged Inspection Based On Modal Technology

With the development of technology, now modern structures are proceeding at t he direction of maximization, complication, automation and continuousness. Structure healthy inspections for those constructions that are releated to the national economy and the people's livelihood during in using are being paid specially attention by mor e and more researchers all over the world.Gradually with the success of technology of dynamical inspection, this inspectiv e technology including space information of structures open an expectant door for str ucture healthy inspection. on the basis of collecting, tiding up, absorbing many of r esearch data about modal analysis and damaged diagnosis, We put forward the pape r's research ideology. The precondition of damaged identification based on modal par ameters is the exact identification of modal parameters. Therefore it is expatiated det ail for theory of modal analysis based on frequency - domain at firstly (therefore th is paper make a comprehensive introduction about theory of modal analysis based on frequency - domain firstly. And a detail study status is given about capability of vib rating transducer and optimal layout of measurement points. Secondly it puts forward a method of modal curvature difference and applies it to detect damaged elastic bea m and plate. Theory explanation and numerical analysis indicates that this method is highly sensitive in detecting damaged locations in the among of beam and plate, and it also can qualitatively explain the damaged degree. In the end, a summary of this study paper and the further research direction in this field are given.