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Active Vibration Control of Parametrically Excited Systems

参数激励系统的主动振动控制

基本信息

批准号：
EP/K005456/1
负责人：
Maryam Ghandchi Tehrani
金额：
$ 12.61万
依托单位：
University of Southampton
依托单位国家：
英国
项目类别：
Research Grant
财政年份：
2013
资助国家：
英国
起止时间：
2013 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=EP%2FK005456%2F1
关键词：
Active Vibration Control Parametrically Excited

项目摘要

This project considers active vibration control of parametrically excited systems (PES). The problem is to develop control strategies for the suppression, or enhancement, of parametric resonances in engineering systems. Active control has the potential to control large amplitudes of vibration and modify the dynamics of the system very efficiently. It is particularly suitable for PES since the dynamics of PES are periodic-time dependent. The appearance of the periodic-time-dependent parameter in the dynamic equation results in a complex response including inherent instabilities, or combined resonances of summed or difference type. Understanding the dynamics of PES and its control is thus the main objective of this research. The control strategy that will be used for PES is based on the receptance method developed by the applicant for linear time-invariant systems. The method has significant advantages, since there is no requirement for knowledge of system matrices, no requirement for model reduction techniques and no requirement for observers to estimate the unmeasured states. The method is entirely based on the measured vibration data; therefore the dynamics of the actuators, sensors and filters are all included in the design of the controller. Other control strategies based on the Floquet theory will also be developed. The control techniques will be implemented on a cable-supported structure, representing a cable-stayed bridge, to demonstrate the practical application of the active control on PES.Many engineering structures are subjected to parametric excitation, which is produced by some external loads interacting with the structure. In civil engineering, Aratsu Bridge in Southern Japan is an example where parametric resonance was the origin of the cracks close to the anchorages. Parametric resonance occurs when the structural frequency coincides with a specific ratio of the parametric excitation frequency. For instance in the Skarnsundet Bridge in Norway, a vertical deck frequency was exactly twice the fundamental cable frequency. Vibration control can be achieved by moving the structural frequency away from that specific ratio using pole placement techniques.In aerospace, parametric resonance can cause flutter of airplane wings due to the interaction of the wing with the aerodynamic loads. Recently, a fatal accident occurred involving a prototype of a business jet due to the tail-plane flutter, and the research aims to develop methods by which such instability can be controlled.In marine engineering, parametric resonance can occur in riser systems due to the interaction of the risers with surface waves. The undesirable dynamic behaviour of these risers can be avoided using tension control. If parametric excitation is not included in the design of these risers, the wave induced vibration can result in instability and even catastrophic failure, thereby causing severe environmental and economic damage so that a more flexible method of active control would make the system safer. The research will also be beneficial in the design of the energy converters such as floaters since it can enhance the parametric resonance, which is used to extract significant amount of power from the wave energy.

该项目考虑参数激励系统（PES）的主动振动控制。问题是开发控制策略来抑制或增强工程系统中的参数共振。主动控制具有控制大幅振动并非常有效地改变系统动态的潜力。它特别适合 PES，因为 PES 的动态与周期时间相关。动态方程中周期时间相关参数的出现导致复杂的响应，包括固有的不稳定性，或求和或差类型的组合共振。因此，了解 PES 的动态及其控制是本研究的主要目标。将用于PES的控制策略基于申请人为线性时不变系统开发的接收方法。该方法具有显着的优点，因为不需要系统矩阵的知识，不需要模型简化技术，也不需要观察者估计未测量的状态。该方法完全基于实测振动数据；因此，执行器、传感器和滤波器的动力学都包含在控制器的设计中。还将开发基于 Floquet 理论的其他控制策略。控制技术将在代表斜拉桥的索支撑结构上实施，以演示主动控制在 PES 上的实际应用。许多工程结构都会受到参数激励，这些激励是由一些与结构相互作用的外部载荷产生的。在土木工程中，日本南部的荒津大桥就是一个例子，参数共振是锚固附近裂缝的根源。当结构频率与参量激励频率的特定比率一致时，就会发生参量共振。例如，在挪威的 Skarnsundet 大桥中，垂直桥面频率恰好是基本电缆频率的两倍。振动控制可以通过使用极点放置技术将结构频率移离该特定比率来实现。在航空航天中，由于机翼与空气动力载荷的相互作用，参数共振会导致飞机机翼颤振。最近，一架公务机原型机因尾翼颤振而发生致命事故，该研究旨在开发控制这种不稳定性的方法。在海洋工程中，由于立管与表面波的相互作用，立管系统中可能会发生参数共振。使用张力控制可以避免这些立管的不良动态行为。如果这些立管的设计中不包括参数激励，波浪引起的振动可能会导致不稳定甚至灾难性故障，从而造成严重的环境和经济损失，因此更灵活的主动控制方法将使系统更安全。该研究还将有益于浮标等能量转换器的设计，因为它可以增强参数共振，从而从波浪能中提取大量电力。