基于MR阻尼器的船用隔离器系统试验研究

随着船舶技术的发展,现代船舶对船用隔离器系统提出了越来越高的要求,即船用隔离器系统应同时具备低频减振和高频抗冲击的能力,这是传统的船用减振器系统所无法做到的．为了解决此问题,本文提出了一种新的船用隔离器系统,该系统由钢丝绳弹簧和磁流变阻尼器相并联组成．文中对该船用隔离器系统的减振和抗冲击性能进行了模型试验研究。减振试验的激振力频率为1-15Hz,力幅为2．94．11．76kN;冲击试验的最大冲击输入加速度为20g,脉宽为10ms,减振试验和冲击试验均采用MTS液压加载系统来进行．试验结果表明,该船用隔离器系统具有较好的减振效果,使用了MR阻尼器后系统得共振峰值被明显的削弱;在冲击试验中,冲击响应的衰减速度随着MR阻尼器的阻尼增加而明显加快,但是MR阻尼器再冲击瞬间的出力特性明显与低频振动情况下不同,MR阻尼器的出力表现为受控制电流强度影响不大．

Research on the dynamic performance of ship isolator systems that use magnetorheological dampers

Isolator systems on ships should ideally be able to simultaneously reduce low frequency vibration response and high frequency shock response. Conventional isolator systems are unable to do so. To solve the problem, a new style isolator system was created. This isolator system consists of a steel coil spring component and a magnetorheological (MR) damper component working in parallel. Experiments on this isolator system were carried out, including tests of vibration reduction and shock resistance. The vibration load frequencies were set from 1–15 Hz, and force amplitudes from 2.94～11.76 kN. The maximum shock input acceleration was 20 g, and impulse width was 10ms. Both the vibration and shock loads were applied using MTS Systems Corporation’s hydraulic actuators. The experimental results indicated that the isolator system performs well on system vibration response, with resonance humps of the vibration response obviously reduced after using the MR damper. For the shock experiment, the attenuation of shock response was much faster with increased MR damping. The MR damper’s effect on shock moments was very different from its performance in vibration mode. The correlation between MR force and control current was not as evident as it was during vibration loads.