薄壁构件的阻尼振动衰减因子的测量

Measurement of Attenuation Factors for Damped Vibration of Thin-shell Structures

阐述了一种以薄壁构件附近的声场测量代替构件辐射面振动测量的方法 .提出用脉冲激发力代替平稳激发力 ,借助近代信息处理技术 ,分离出各种模式的阻尼振动 ,可测定各个模式的简正振动频率及相应的振动衰减因子 .

In this paper a measurement method for attenuation factors of the vibration of the thin-shell structures is proposed,in which the acoustic measurement in the sound field near the structure is applied instead of the vibration measurement on the radiating surface.In the paper an impulsive exciting force takes the place of the stationary source.By means of the application of digital signal processing,various modes of damped vibration can be separated.The frequencies,and hence,their corresponding attenuation factors of these modes can be determined individually.