关键词: 基础激励, 频域带宽法, 悬臂薄板, 阻尼测试

Abstract:

For some small size structures required to obtain the damping parameters precisely, damping identification method of half-power bandwidth by the dynamic ping method was often unsatisfactory. Herein, on the basis of confirming the principal formulas of the damping identification, a new test method was proposed to identify damping parameters in the frequency domain by sweep excitation through vibration shaker exciter, which was on the improvement of classic half-power bandwidth method and was named as FBM. Moreover, this new method was subdivided into the following two damping identification methods, i.e. direct response method and response with a reference signal(RSFBM)  in frequency domain. And their test and identification process were illustrated respectively by practical damping measurement which was carried out on the research object of small size and thin cantilever plate. At last,the detailed influences on damping results were discussed and analyzed in the aspects of the sweep rate, sweep direction and the two different identification methods. This study can provide an important reference to experimental damping test in engineering field.

Key words: base excitation, frequency bandwidth method(FBM), thin cantilever plate, damping test