Optimum design and vibration suppression of large flexible smart structures

由于运输成本高，大多数实用结构通常重量轻且灵活。因此，由于不同的外部干扰可能与设计阶段考虑的不同，它们可以在较低的固有频率附近受到激励。这可能随后导致结构不稳定或操作的精确度和精确度急剧下降。为了缓解这些问题，智能结构技术在许多航空航天、民用和汽车应用中变得越来越重要。智能结构是一种由集成了离散传感器和执行器的主机结构组成的自适应结构，由一个控制器引导，该控制器能够在时变的环境和运行条件下修改结构的动态响应。因此，设计和开发用于实际应用的形状和振动控制的智能结构是本提案的长期目标。它的目的是建立一个平台，开发这一领域的创新方法，并促进这项新技术在加拿大的传播。为了有效地实现这一目标，我们将首先研究以下问题：一、高分辨率动态作动器的设计优化与开发；二、基于压电线性驱动器的智能桁架结构的设计优化与振动主动控制；三、压电层合板结构的设计优化与振动主动控制；四、离散结构磁流变阻尼器的设计优化与半主动减振。在这些问题中，将探索相互作用的学科之间的耦合的协同效应，并建立考虑耦合效应的数学公式，进而提出基于数学基础的高效、创新的分析和设计优化技术，以找到所需的构型，并在大范围激励下抑制振动。将进行基本的实验研究，其中将产生概念验证测试智能结构，并对这些测试结构的性能进行评估。

Due to the high cost of transportation, most practical structures are typically light weight and flexible.  Thus they can be excited near their lower natural frequencies due to varying external disturbances which may be different than those considered in the design stage. This may subsequently lead to the structural instability or a drastic reduction in accuracy and precision of operation. To alleviate these problems, the smart structure technology is becoming increasingly important in many aerospace, civil and automotive applications. Smart structure is a self-adaptive structure made up of a host structure which is integrated with discrete sensors and actuators and directed by a controller capable of modifying the dynamic response of the structure in the presence of time-varying environmental and operational conditions.  The design and development of smart structures for shape and vibration control in practical applications is the long term objective of this proposal. It is intended to establish a platform to develop innovative methodologies in this field and foster the spread of this new technology in Canada. To move along this goal efficiently, the following first-priority problems will be studied: I- Design optimization and development of piezoelectric linear actuator with high resolution and dynamic actuation force, II- Design optimization and active vibration control of smart truss structures using piezoelectric linear actuators; III- Design optimization and active vibration control of piezolaminated composite structures; IV-Design optimization and semi-active vibration suppression of discrete structures using Magneto-Rheological (MR) dampers. In these problems, the synergistic effects of coupling between interacting disciplines will be explored and the mathematical formulation considering the coupling effect will be developed.  Then, efficient and innovative analysis and design optimization techniques based on the mathematical foundation will be formulated to find desired configuration and to suppress the vibration under a wide range of excitations. Fundamental experimental study will be conducted where the proof-of-concept test smart structures will be produced and the performance of these test structures will be evaluated.