关键词: 阻尼损耗因子；曲面拟合；阻尼测试；频响函数；最小二乘法

Abstract: In order to investigate the damping characteristics of damping materials at different temperatures and frequencies, the damping loss factor data of a vehicle hot melt damping material were obtained based on SAE J1637—2022 laboratory measurement of the composite vibration damping properties of materials on a supporting steel bar. The least square method was used to establish the fitting surface of damping loss factor to temperature and frequency, more damping loss factor data are obtained by this test method, and compared with the fitted surface data to verify the accuracy of the fitted surface.The research shows that this method can accurately predict the damping loss factor at different temperatures; for this damping material, its frequency-dependent characteristics are affected by temperature; besides temperature at peak damping loss factor is different at different frequencies.

Key words: Damping loss factor; Curved surface fitting; Damping test; Frequency response function; Least-square method