多个小中间质量隔振最优设计及其性能研究  

OPTIMUM DESIGN AND PERFORMANCE STUDY OF MULTIPLE-SMALL-MIDDLE-MASS VIBRATION ISOLATION

作　　者：杜冬[1] 禇德英 孙中涛[2] 华宏星[1] 

机构地区：[1]上海交通大学机械系统与振动国家重点实验室,上海200240 [2]南京航空航天大学无人机研究院,南京210016

出　　处：《振动与冲击》2008年第7期36-41,68,共7页Journal of Vibration and Shock

摘　　要：在限定的重力静变形约束下给出了多个小中间质量隔振装置的最优设计并探讨了其隔振性能。这种装置将经典的双层隔振(the Two-Stage Vibration Isolation i.e.TSVI)所采用的大中间质量用多个分散小质量块代替,因此它具有安装方便和可靠性高等优点。更重要的是,仿真显示,多个小中间质量隔振装置可以削平TSVI的第二个共振峰而且其高频性能几乎与TSVI相同。为简化研究,采用了等质量,等刚度比和固有频率等间距分布假设,另外,无穷维动力系统去近似有限维系统的思想在这里再次显示了其简洁高效的优点,借助于该思想,得到了小中间质量隔振策略最优设计的解析式。最后仿真显示了小中间质量隔振的优越性并揭示了其隔振机理。An optimum design for multiple-small-middle-mass vibration isolation is proposed under the appointed deflection of gravity, and additionally its performance is demonstrated. Replacing the massive middle mass of the classical two-stage vibration isolation (TSVI) with multiple decentralized small mass blocks, this strategy can work more reliably. Especially it can f\latten the inherent second resonant peak of the TSVI. To simplify the discussion, it is assumed that all small middle mass blocks have the same mass and stiffness ratios; moreover, their natural frequencies are distributed uniformly. Using the infinite-dimension dynamic system to approximate the finite-dimension one, the analytical optimum pa-rameters are derived out. The simulations verify its better performance and discover the isolation mechanism.

关 键 词：隔振 外力激励 基础加速度激励 优化参数 滞回阻尼 

分 类 号：TU311[建筑科学—结构工程]