基于磁流变悬置的动力装置垂向隔振控制与试验研究

Vertical vibration isolation control for power plant via magneto-rheological mounts and relevant experiments

基于挤压模式的磁流变半主动悬置工作原理和阻尼特性,在建立动力装置垂向隔振模型的基础上,设计出模糊自适应隔振控制器,用量化、比例因子自调整算法降低不同工况下动力装置垂向激励力的传递;给出一种改进的天棚控制算法,通过抑制动力装置振动来降低能量传递。设计出动力装置隔振台架试验系统,在不同工况下进行隔振对比试验。结果表明,在动力装置处于中低转速时,可控磁流变悬置能在宽频范围内把力绝对传递率抑制到25%内,隔振效果优于橡胶悬置;而磁流变悬置垂向隔振方法中,兼顾振动传递率和激励频率的模糊自适应控制,优于通过抑制动力装置自身振动来隔振的天棚控制。

The operation principle and damping characteristics of a magneto-rheological （MR） semi-active mount in squeeze mode were analyzed. A vertical vibration isolation model of a power plant was proposed. A fuzzy adaptive control （FAC） system utilizing a scale factor self-turning algorithm was designed to decrease the vertical excitation force of the power plant in different operation conditions. A revised skyhook control strategy was also adopted to reduce the energy transmission by restraining the vibration of the power plant. An experimental isolation system for a real power plant was presented. The isolation tests in different conditions were carried out. Experimental results show that the MR mount system can decrease the absolute force transmissibility ratio to 25 %, which is better than that of rubber mounts at lower rotating speed. Tests confirm that FAC, which considers vibration transmissibility and excitation frequency concurrently, can provide better performance in reducing the total vertical transmitted force than skyhook controller, which is used in vibration isolation by restraining the vibration energy of the power plant.