Development of a system for the estimation of FRFs using MIMO technique

摘要

The present paper treats with the development of a system for estimating the Frequency Response Functions (FRFs) using Multiple Input Multiple Output (MIMO). Technique. The system was developed using LabVIEW softwar (Laboratory Virtual Instrument Engineering Workbench), which uses a graphical programming language, and includes libraries for data acquisition, instrument control, data analysis and data presentation. Results of experimental tests carried on a prototype of a simply supported beam were used to test the developed system. Experimental tests were also carried on small scale model of an offshore platform using two orthogonal simultaneous random excitations. The response of 32 accelerometers were measured, and the obtained FRFs between all acceleration responses and excitation forces were calculated. The obtained FRFs were then used to estimate the modal parameters. According to the tests, the developed system could be used for experimental tests of small scale models and offshore structures prototypes.