Semi-automated optimal vibration suppression of flexible structures

柔性结构的半自动优化振动抑制

• 批准号: 239178-2009
• 负责人: Esmailzadeh, Ebrahim
• 金额: $ 2.19万
• 依托单位: University of Ontario Institute of Technology
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2009
• 资助国家: 加拿大
• 起止时间: 2009-01-01 至 2010-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=425845
• 关键词: Semi; automated; optimal; vibration; suppression

The overall objective of the proposed research program is to develop an innovative approach for optimum vibration suppression of flexible structures. Commonly used passive vibration absorbers become de-tuned over time due to the structural variations. In order to compensate for these deviations, active vibration control schemes are needed. These techniques, however, suffer from the control induced instability in addition to the large control effort requirement. Utilizing concurrent use of semi-active and active subsections, an intelligent semi-automated alternative is suggested. The semi-active subsection includes smart structures ranging from ER/MR dampers to magnetostrictive actuators, and a particular set of piezoelectric actuators forms the active subsection. By altering the adjustable structural properties (in semi-active unit) and control parameters (in active unit), a search is conducted to minimize an objective function subject to constraints, which may reflect performance characteristics. In practice, an engineer in-the-loop interprets the resulting performance and may initiate a number of options: control optimization, semi-active component optimization, or combination of the two. The predominant activity of the proposed study will be to develop and facilitate this interpretive decision making via numerical tools. The vibration should be suppressed to the possible extent using a semi-active unit (the least power consuming effort) through proper adjustment of smart materials, while the active absorber unit handles the remaining vibration suppression requirement. If the resulting design is not acceptable or if system parameters show variations, an interpretation procedure triggers to alter the parameters of the semi-active unit, or retune the control parameters of active unit, or concurrently adjust both. These features are very important and will broaden the utility of the vibration absorbers in industrial applications where a wide range of structural variations is encountered. The feasibility of the proposed method is demonstrated through the simulations of a SDOF system. The challenge lies in the development of intelligent decision-making processes for hybrid treatment when implemented on realistic systems with complex dynamics and controllability.

提出的研究计划的总体目标是开发一种创新的方法来优化柔性结构的振动抑制。由于结构的变化，常用的被动吸振器会随着时间的推移而失谐。为了补偿这些偏差，需要主动振动控制方案。然而，这些技术除了需要大量的控制工作外，还受到控制引起的不稳定性的困扰。利用半主动和主动分段的并发使用，提出了一种智能半自动替代方案。半主动分段包括从ER/MR阻尼器到磁致伸缩致动器的智能结构，一组特定的压电致动器构成主动分段。通过改变可调结构特性（半主动单元）和控制参数（主动单元），搜索受约束的目标函数，使其最小化，从而反映性能特征。在实践中，工程师会对结果性能进行解释，并可能启动一些选项：控制优化、半主动组件优化或两者的结合。拟议研究的主要活动将是通过数字工具发展和促进这种解释性决策。通过适当调整智能材料，利用半主动单元（耗电量最小）尽可能地抑制振动，而主动吸收单元则处理剩余的振动抑制要求。如果设计结果不可接受或系统参数出现变化，则触发解释程序来改变半活动单元的参数，或重新调整活动单元的控制参数，或同时调整两者。这些特点是非常重要的，并将扩大减振器在工业应用中的用途，在工业应用中遇到了广泛的结构变化。通过对SDOF系统的仿真，验证了该方法的可行性。在具有复杂动力学和可控性的现实系统中，混合处理的智能决策过程的开发是一个挑战。