电流变智能阻尼器的减振机理及变结构控制设计

In terms of the practice that, in the multiple DOF vibration control system,.damping forces should be adjusted online according to the encountered complex.excitations, such as shock, multiple main frequency harmonic excitations, stable.variable frequency excitations and multiple frequency variable frequency excitations,optimal damping ratio is analyzed and the optimal damping set of multiple models control is established on the basis of the design criteria of damping force only dissipating vibration energy, optimal frequency response, minimizing the maximal accelerations and amplitudes of objects. Multi-model adaptive strategy for vibration.control is presented, in which saturated nonlinearity of actuator and real time.identification of vibration energy dissipation are incorporated. For non-shock excitations, control is decoupled with external disturbance through combining controller design with the choice of sliding surface gradient parameters according to the Routh-Hurwitz stability criterion of reduced order sliding mode dynamics. a semi-active static output feedback continuous variable structure control strategy for the vibration attenuation is proposed for the complete self-adaptability to external.disturbance. For the complex main requency excitations, fuzzy forward real time control strategy for vibration suppression is developed based on the real time.identification of main frequency, optimal frequency response and minimal.amplitudes. Result indicated that the proposed fuzzy strategy provided the.performance index of shock isolation and vibration attenuation over 30 %,.remarkable superior over traditional damping vibration suppression of 25 %..New multi-electrode ER damper is presented to eliminate the difficulty of.how to improve the controllable scope of conventional ER damper. The mechanism of how to enlarge the controllable scope is analyzed simultaneously. The achievements of this research provide key technologies to the vibration attenuation and isolation of submarine floating rafts and its precise instruments in our country

针对多层减振结构中阻尼需随激励信号不断改变的特点，本研究揭示其阻尼受激励频率、冲击状况制约的关系，建立它们之间的离散对应规律，利用电流变液粘度可受电场控制，探索将其作为阻尼的粘度变结构控制方法，通过对激励信号的时、频特征在线识别，达到自适应控制阻尼力随激励频率、冲击状况变化，为电流变智能阻尼器提供设计方法和关键技术。