Continued research on vibration control of mechanical systems and new initiative to study fluid-structure interactions

机械系统振动控制的持续研究和流固耦合研究的新举措

• 批准号: 184068-2006
• 负责人: Liu, Kefu
• 金额: $ 1.24万
• 依托单位: Lakehead University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2008
• 资助国家: 加拿大
• 起止时间: 2008-01-01 至 2009-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=392284
• 关键词: Continued; research; vibration; control; mechanical

New mechanical systems are characterized by high speed, lightweight, and computerization. Such systems include space robots, space structures, spacecrafts, automobiles, and high speed commuter trains, etc. Reliable and robust vibration control plays a critical role in the design and operation of such systems. Traditionally, unwanted vibrations have been suppressed by passive methods through energy dissipation or energy absorption. Due to the significant progress in computer and electronics engineering, new sensors, actuators, and microprocessors make it possible to use semi-active or active vibration control. Fluid-structure phenomena are of major importance for aerospace, mechanical or biomedical applications. The applicant intends to continue his research on vibration control of complex mechanical systems and to initiate new collaborative research on fluid-structure interaction. The proposed research on vibration control will focus on two areas: (1) active control of time-varying/nonlinear systems; (2) semi-active control devices and methods. Examples of time-varying systems include traveling media with variable length such as elevator and hoist cables, flexible robotic arms. The applicant plans to develop new control methods that are more effective and robust. A semi-active vibration absorber device and an active vibration absorber were developed by the applicant and his student. In this study, the applicant will make the devices more practical through improvement of design and perfection of control methods. The proposed initiative in fluid-structure interaction is motivated by the need to investigate the causes of in-stent stenosis problems. The phenomenon will be treated as an interaction between a pulsatile flow and an elastic artery embedded with a relatively rigid stent. The applicant will approach the problem numerically and experimentally. The proposed research on vibration control will advance the knowledge of design and control of machinery in general. The study results are expected to impact on the Canadian industry such as aerospace and manufacture. The proposed research on fluid-structure interaction will help design of better biomedical devices.

新型机械系统的特点是高速、轻便和计算机化。这些系统包括空间机器人、空间结构、航天器、汽车和高速通勤列车等。可靠和鲁棒的振动控制在这些系统的设计和运行中起着至关重要的作用。传统上，通过能量耗散或能量吸收的被动方法来抑制不必要的振动。由于计算机和电子工程的重大进展，新的传感器，致动器和微处理器使得使用半主动或主动振动控制成为可能。流体-结构现象对于航空航天、机械或生物医学应用具有重要意义。申请人打算继续其在复杂机械系统的振动控制方面的研究，并开始在流体-结构相互作用方面的新的合作研究。振动控制的研究将集中在两个方面：（1）时变/非线性系统的主动控制;（2）半主动控制装置和方法。时变系统的示例包括具有可变长度的行进介质，诸如电梯和起重机线缆、柔性机器人臂。申请人计划开发更有效和更稳健的新控制方法。申请人及其学生开发了半主动吸振装置和主动吸振装置。在本研究中，申请人将通过改进设计和完善控制方法使装置更加实用。提出流体-结构相互作用倡议的动机是需要调查支架内狭窄问题的原因。该现象将被视为脉动流与嵌入相对刚性支架的弹性动脉之间的相互作用。申请人将用数值和实验方法解决这个问题。振动控制的研究将促进机械设计和控制的知识。研究结果预计将对加拿大的航空航天和制造业产生影响。对流体-结构相互作用的研究将有助于设计更好的生物医学装置。