Sensitivity analysis of sticking area for damping material

  Objectives  In order to improve the data sensitivity of current acoustic test methods on the construction quality of damping material,

  Methods  the vibration level difference of single frequency points based on the Frequency Response Function(FRF)is proposed. Aiming at a general ship-based test bench, the hammering method is utilized to obtain testing data of the damping material before and after changing the sticking area. The damping factor, synthetic FRF level, vibration level difference of single frequency points and frequency spectrum of the typical measuring points are then used to carry out data processing and comparison analysis. The data sensitivity of abnormal sticking quality and the accuracy of identifying abnormal areas are then obtained.

  Results  When using the vibration level difference of single frequency points for the identification of abnormal sticking quality in damping material, the data deviation is less than 1 dB when the damping material makes complete contact, and more than 2 dB when the sticking quality is changed as the frequency point.

  Conclusions  The method of using the vibration level difference of single frequency points is characterized by high data sensitivity, low data amount and accurate identification of abnormal areas, making it worthy of application.