Load Identification And Vibration Analysis Of Complex Cylindrical Shell-interior Structure Coupling System

The vibration response of the structure is decided by vibration sources and transfer path.In mechanical dynamic design, the structural dynamic load identification and analysis ofcharacterization is the basis of structural response estimates, and transfer path analysis is aneffective way to optimize and assess the structural vibration performance. Therefore, theanalysis of vibration source and transfer path becomes a common technical way in slovingengineering vibration problems.This paper firstly describes the key issues in the kinetic modeling process, then creats theanalysis model. In order to fix this modal and ensure the accuracy,modal test result is used inthe modeling process. The matrix of the structure’s frequency response function is extractedwith the finite element simulation software using the accuracy modal. According to theanalysis of the main factors affecting the load identification accuracy, optimal combination ofmeasured response points is determined to identify the multi-excitation of shell-couplingsystem based on least squares method with regularization improvement. Finally the accuracyof dynamic load results is ensured by response reconstruction.On the basis of structure’s dynamic loads, the transfer path analysis is carried on theresponse spectrum of three typical position on shell, and the contribution of the transmissionpath of the response spectrum is calculated under five larger peak frequency. Finally theresponse at the peak frequency is determined to be caused by the big excitation force or shellresonance by the analysis of of serious vibration causes.Finally, the thesis designed and built a cylindrical shell with partition on both ends, thenlots of research is carried out on this modal, including the synthesis test of vibration responseunder multi-load and the analysis of vibration response under coupled loads, especially thelatter part.