Experimental and Simulation Studies on Vibration Modes of Damping Treated Thin Plate at Different Temperatures

Abstract:

A modified environment chamber and a laser vibration meter were used to identify the modal parameters of damping treated thin plate at different temperatures. An experimental analysis was conducted to analyze the influence of temperature on the modal frequency and modal damping ratio. The results show that the temperature is negatively correlated to the modal frequency of damped thin plate， the modal damping is greatly reduced at extremely high and low temperatures. An inverse identification method based on optimization algorithm was proposed to identify the material properties of damping material. The variation of complex modulus and loss factor of damping material with temperature and frequency were identified for further verification by finite element method. The simulation results show that the resonant frequencies and response amplitude are better correlated to the measured values， by using the temperature and frequency dependent parameters to predict the vibration response of damping treated thin plate.

Key words:damping material;thin plate;vibration modes;parameter identification;frequency dependent properties