A New Approach to Active Vibration Suppression

主动振动抑制是结构力学和主动控制这两个独立学科交叉的研究领域。桥梁、建筑物和航空航天结构等大型柔性系统的动态行为通常涉及许多固有频率和模态;理论上连续结构中的固有频率和模态是无限多的。在两个重要方面，现有的结构动力学（有限元）模型不适合与传统的主动控制（状态空间）方法一起使用;它们太大，不能足够准确地表示阻尼。这个问题是解决了一个新的方法来主动振动抑制使用实测的接收。该方法可以看作是一个反问题，它提供了一个全新的理论观点和新的认识。该理论起源于结构动力学，而通常在主动振动抑制中，由主动控制社区开发的理论被应用于结构振动问题。开发的方法是通用的，具有广泛的应用，并不限于特定类型的结构。它解决了目前用现有方法很难解决的问题。它不受物理尺寸或复杂性的限制，也不依赖于（可能不准确的）数学模型。这项研究不仅包括一种全新方法的理论发展，而且还包括该理论在实验室试验、旋翼模拟和直升机地面振动试验中的实际用途的证明。该研究将与Westland Helicopters Ltd.的工程科学家密切合作。

Active Vibration Suppression is the area of research at the intersection of two mostly independent disciplines, Structural Mechanics and Active Control. The dynamic behaviour of large flexible systems such as bridges, buildings and aerospace structures generally involves many natural frequencies and modes; in theory an infinite number in continuous structures. In two important respects the available structural-dynamics (finite element) models are unsuitable for use with conventional active control (state-space) methods; they are too large and do not represent damping accurately enough. This problem is addressed by a new approach to active vibration suppression using measured receptances. The method, which may be cast an inverse problem, offers a completely fresh theoretical viewpoint, with attendant new understanding. The theory has its origins in structural dynamics, whereas generally in active vibration suppression, theory developed by the active control community is applied to structural vibration problems. The method developed is generic, having wide applications and not limited to particular types of structures. It addresses a problem that is presently very difficult to tackle with existing methods. It is not limited by physical size or complexity, and does not rely on (possibly inaccurate) mathematical models. The research will include not only the theoretical development of a completely new approach but also the demonstatation of practical usefulness of the theory in laboratory tests, rotor simulations and helicopter ground vibration tests. The research will be carried out in close collaboration with engineering scientists from Westland Helicopters Ltd.