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: 2010
• 资助国家: 加拿大
• 起止时间: 2010-01-01 至 2011-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=455197
• 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.

拟议的研究计划的总体目标是开发一种创新的方法，柔性结构的最佳振动抑制。常用的被动吸振器由于结构变化而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努力之外，还存在控制引起的不稳定性。利用并行使用的半主动和主动子部分，一个智能的半自动化的替代建议。半主动部分包括从ER/MR阻尼器到磁致伸缩致动器的智能结构，并且一组特定的压电致动器形成主动部分。通过改变可调节的结构特性（在半主动单元中）和控制参数（在主动单元中），进行搜索以使受约束的目标函数最小化，这可以反映性能特性。在实践中，工程师在回路中解释所产生的性能，并可能启动许多选项：控制优化，半主动组件优化，或两者的组合。拟议研究的主要活动将是通过数字工具开发和促进这种解释性决策。应通过适当调整智能材料，使用半主动单元（功耗最小）将振动抑制到可能的程度，而主动吸振器单元处理剩余的振动抑制要求。如果所得到的设计是不可接受的，或者如果系统参数显示出变化，则解释过程触发以改变半有源单元的参数，或者重新调谐有源单元的控制参数，或者同时调整两者。这些特征是非常重要的，并且将拓宽振动吸收器在遇到广泛结构变化的工业应用中的实用性。通过单自由度系统的仿真验证了该方法的可行性。面临的挑战在于智能决策过程的发展，混合治疗时，实现对现实系统的复杂动态和可控性。