<正>一、实验装置和方法 实验装置:将两端固定的铝合金钢管(或有机玻璃管)、激振压电晶片和拾振压电晶片密封于钢管中部,用屏蔽电缆线,分别接至讯号发生器、频率计和示波器。 实验方法:空管时,调节讯号发生器输出的激振讯号频率。频率由小到大,直到钢管发生共振。此时在示波器上观察到拾振讯号的振幅最大,从频率计读得空管的基频f_(01)。然后把蒸馏水注入钢管中(注意要设法排除水中的气泡),同法可测得盛满蒸馏水时管道的基频f_1。重复上述操作,就可测得一系列的f_(01)和f_1。

This paper describes the dynamic hydroelastic modulus E’ measured in the experiment and presents the formula of the dynamic hydroelastic modulus. Experimental results show that there are three stages for the dynamic hydroelastic modulus with vibratory frequencies: linear, transitive and horizontal. It is found that the added mass theory is rather limited. When EI>>E’I’, the formula of the dynamic hydroelastic theory may be simplified into the formula of the added mass theory, and only when the added mass theory is right.