螺旋桨脉动压力引起桨－轴系－船体耦合系统的振动声辐射是水下航行器低频声辐射的主要贡献者。利用振动传递控制减小脉动压力通过轴系对船体的激励是控制其低频声辐射的重要措施。针对该问题，提出一种基于自适应双负电容压电分流阻尼的控制方法。理论方面，通过建立含分流阻尼电路的桨－轴系－船体机电耦合系统力学模型和开展稳定性分析，揭示其多模态宽带振动控制机理，获得分流阻尼电路的最优参数；通过对基于高电压运算放大器的双负电容压电分流电路、基于电路可控电阻调节负电容参数的自适应控制电路的设计和分析，实现弱应变下广义机电耦合系数增强、大激励下运算放大器抗饱和以及复杂环境下最优参数自适应调节。试验方面，开展负电容压电分流电路的阻抗特性测试、施加压电分流阻尼控制的桨－轴系－船体/板缩比模型的响应对比测试，对建模方法、不同转速和激励幅值下的控制机理和效果进行验证。研究成果将为该方法的实际工程应用提供坚实的理论基础。

The vibration and resultant underwater sound radiation of propeller-shaft-hull coupled system induced by the fluctuating propeller pressures is one of the principal contributors at low frequency range for underwater vehicles. Vibration transmission control of fluctuating pressures through the shaft is an important measure to control low-frequency noise radiation. Aimed at this problem, the project has presented a new control scheme by employing an adaptive tuning piezoelectric shunt with two negative capacitances. For theoretical analyses, modeling of the Electro-mechanical coupling system consisting of the propeller-shaft-hull and the adaptive tuning piezoelectric shunt is carried out; the multiple mode broadband control mechanism and the effects of parameters on the responses are investigated; optimal parameters of the piezoelectric shunt are obtained; circuit analysis and implementation on piezoelectric shunt circuit with two negative capacitances is studied; negative capacitance is constructed based on high-voltage Operational Amplifier(OpAmp); adaptive tuning is realized by an electronically tunable resistor, which is employed to change the value of the negative capacitance to the best fit for the present condition; the capability of the proposed shunt to increase the general electromechanical coupling factor for small strain, to enhance the anti-saturation performance even at high vibration level and to develop the adaptability of optimal parameters under varying operation conditions is analyzed. For experimental investigation, electrical impedance measurement of the piezostructure and vibration responses tests on a scaled propeller-shaft-hull/plate coupled system with/without the adaptive tuning piezoelectric shunt are carried out to verify the modeling method, the control mechanism as well as the effect of the proposed method under different rotation speeds and excitation amplitudes. The investigation will give a sound theoretical reference to the design of adaptive tuning piezoelectric shunt in a propeller-shaft-hull coupled system.