Modal Analysis for Structural System in Operating Conditions

• Main Authors: HuaLiang Hu, 胡華良
• Other Authors: BorTsuen Wang
• Format: Others
• Language: zh-TW
• Published: 2002
• Online Access: http://ndltd.ncl.edu.tw/handle/38207928050776289521

碩士 === 國立屏東科技大學 === 機械工程系 === 90 === This work presents the modal analysis for multiple degree-of-freedom system in operating conditions and develops the method to obtain mode shapes from the measured operational deflection shape (ODS). First work is to design and make a MDOF system. Use the impact testing method and shaker excitation method to obtain modal parameters for MDOF system. This work chose time domain method, frequency domain method and transmissibility method to measure ODS. The prediction formula theory feasibility analysis presented is precisely. Several experimental examples include resonant and anti-resonant excitation are presented to demonstrate the feasibility of the predictive algorithm and shown successful in determining all of the mode shape vectors. The anti-resonant excitation predicts mode shape accuracy than resonant excitation states, because the measured ODS its modal characteristic uniformly when anti-resonant excitation state. The predictive model can also be extended to rotary system in operating conditions and break through the traditional experimental modal analysis’s limit. The study can to expand to multiple harmonic excitations and force prediction problem.