Further studies on semi-active and active vibration control of mechanical systems

在大多数机械系统中，振动被认为是有害的。过多的振动会导致零件疲劳和机器故障。不受控制的振动会导致汽车、火车和飞机等的不适感。轻微的振动会使光学仪器等精密设备无法操作。振动控制对于现代机械来说是非常重要的。振动控制方法可分为被动、半主动和主动三种。在运行条件不变的情况下，被动振动控制是有效的。为了使振动控制系统能够适应变化的环境，必须采用半主动或主动控制。在过去的六年里，申请人、他的研究生和合作者在半主动和主动振动控制方面取得了重大进展。特别是，开发了两种新型隔振器，并将其应用于单自由度系统。为了将所开发的隔振器应用于实际机械系统，有必要将研究扩展到多自由度系统。对于这项拟议的研究计划，申请人打算实现三个短期目标。(1)将研制的可调谐HSLDS隔振器应用于多自由度系统。研究了组合系统的动力学行为。制定有效的调谐方法。(2)将研制的主动隔振器应用于多自由度系统。研究了组合系统的动力学行为。制定有效的控制方法。(3)改进所研制的半主动/主动隔振器的设计。开发新的振动控制装置。申请者的长期目标是将研究成果应用于相关行业，并为复杂机械系统的振动控制知识做出贡献。建议的研究成果是可直接应用于隔振的新型振动控制装置和方法。这项研究既受到学术兴趣的推动，也受到行业需求的推动。在学术上，将获得新的知识和技术。实际上，潜在的应用将会产生。拟议的研究将为HQP的培训提供极好的机会。

In most mechanical systems, vibrations are considered detrimental. Excessive vibration causes part fatigue and machine failure. Uncontrolled vibration results in discomfort in automobiles, trains, and airplanes, etc. Slight vibration makes operation of precision devices such as optical instruments impossible. Vibration control is very important for modern machines. Vibration control methods can be classified as passive, semi-active and active. Passive vibration control is effective if operation conditions remain unchanged. To make vibration control systems adaptable to varying conditions, semi-active or active control must be employed. Over the last six years, the applicant, his graduate students, and collaborators have made a significant progress in semi-active and active vibration control. In particular, two novel vibration isolators were developed and applied to single-degree-of-freedom (SDOF) systems. In order to apply the developed vibration isolators to real mechanical systems, it is imperative to extend the study to multiple-degree-of-freedom (MDOF) systems. For this proposed research program, the applicant intends to accomplish three short-term objectives. (1) Apply the developed tunable HSLDS vibration isolator to MDOF systems. Investigate the dynamic behaviors of the combined systems. Develop effective tuning methods. (2) Apply the developed active vibration isolator to MDOF systems. Investigate the dynamic behaviors of the combined systems. Develop effective control methods. (3) Improve the design of the developed semi-active/active vibration isolators. Develop new vibration control devices. The applicant's long-term objectives are to apply the research results in relevant industries and contribute to the knowledge of vibration control of complex mechanical systems. The outcomes of the proposed study are novel vibration control devices and methodologies that can be directly applied to vibration isolation. The study is driven both by academic interests and industrial needs. Academically, new knowledge and techniques will be gained. Practically, potential applications will be produced. The proposed research will provide excellent opportunities for the training of HQP.