可控阻尼半主动冲击隔离技术研究

SEMI-ACTIVE SHOCK ISOLATION TECHNOLOGY BASED ON CONTROLLABLE DAMPING

传统的冲击隔离系统通常都只是从刚度上进行设计,因此在提供较高冲击隔离效率的同时,往往带来很大的相对位移。针对那些遭受持续时间很短的冲击,但又对冲击隔离效率和相对位移有严格限制的冲击隔离问题,提出了可控阻尼的半主动冲击隔离技术。在不遭受冲击时该半主动冲击隔离系统工作于最小阻尼状态,不影响隔振性能。在遭受冲击时,通过分两个阶段的半主动控制策略控制阻尼比的变化,可以自动地在保证冲击隔离效率的前提下,使用尽可能大的阻尼比,从而大幅降低相对位移幅值。仿真研究表明该可控阻尼半主动冲击隔离技术可以取得优异的冲击隔离性能。

All of the shock isolation systems are traditionally designed by selecting suitable stiffness paremeters. So these shock isolation systems besides offer high shock isolation efficiency, also result in large relative displacement. A semi-active shock isolation technology based on controllable damping is put forword to solve the problem that the shock isolation system must offer high shock isolation efficiency and small relative displacement at the same time when it is suffered from a shock with short duration. To assure the performance of vibration isolation the semi-active shock isolation system works in minimum damping when it is apart from the shock action. When the shock is acting on the system, a two-parts semi-active control strategy is applied to control the system by using as big damping ratio as possible to reduce the relative displacement under the condition that the shock isolation efficiency is ensured. By simulating examples, it is proved that the technology can get excellent shock isolation performance.