Dynamics and Control of Micropolar Material Structures with Embedded Angular Momentum

嵌入角动量的微极性材料结构的动力学与控制

• 批准号: RGPIN-2017-03866
• 负责人: Heppler, Glenn
• 金额: $ 1.6万
• 依托单位: University of Waterloo
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2019
• 资助国家: 加拿大
• 起止时间: 2019-01-01 至 2020-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=678667
• 关键词: Dynamics; Control; Micropolar; Material; Structures

Thirty years ago it was proposed to model structural systems that contained a very large number of gyroscopes as an elastic continuum with an embedded continuous distribution of angular momentum. The idea came from the astronautics community where the notion of very large space platforms (satellites) was popular and means of controlling their shape and orientation were of interest. Initial work established the merits of the idea for structural shape control but interest waned because these systems would not be realized owing to their cost. A new opportunity for application of this idea lies at the opposite end of the scale spectrum. Micro-Electro-Mechanical-Systems (MEMS) devices offer an unprecedented opportunity to build "smart" material systems that will macroscopically display behaviours not possible with conventional materials. With the ongoing developments in micro and nano device fabrication a material that contains an embedded, independent, and controllable distribution of angular momentum could be created, should there be compelling reasons to do so. Materials with these attributes, previously referred to as gyric materials, have received scant attention but prior work has established their potential for structural shape control. This ability could be beneficially incorporated in optical devices to tune mirrors, in the active control of boundary layer behaviour in aeronautic applications, or possibly in surgical instruments where very small shape changes may be advantageous. There are many potential applications. These material models require an asymmetric stress tensor and it has been shown that material models that assume asymmetric strain and stress tensors are effective and applicable at the micron scale. Hence it is proposed that an investigation into the dynamics and control of material and structural systems with fundamental contributions from distributed inertial, elastic, dissipative, and gyroscopic influences be undertaken using a micropolar theory of elasticity.

三十年前，提议对结构系统进行建模，该结构系统包含大量陀螺仪作为具有角动量连续分布的弹性连续体。这个想法来自宇航员社区，那里很大的太空平台（卫星）的概念很受欢迎，控制其形状和方向的手段引起了人们的关注。最初的工作确立了结构形状控制的想法，但兴趣降低了，因为这些系统不会因为其成本而实现。应用此想法的新机会在于量表频谱的另一端。微电动机械系统（MEMS）设备提供了一个前所未有的机会来构建“智能”材料系统，这些系统将在传统材料中宏观地显示出宏观的行为。随着微型和纳米设备制造的持续发展，如果有令人信服的理由这样做，则可以创建包含嵌入，独立且可控的角动量分布的材料。具有这些属性的材料（以前称为Gyric材料）受到了很少的关注，但先前的工作已经确定了其结构形状控制的潜力。可以将这种能力纳入光学设备中，以调整镜子，在航空应用中边界层行为的主动控制中，或者可能在形状很小的变化可能是有利的外科手术仪器中。有许多潜在的应用。这些材料模型需要不对称的应力张量，并且已经表明，假设不对称应变和应力张量的材料模型在微米尺度上是有效且适用的。因此，建议使用微极性理论对材料和结构系统的动力学和结构系统进行基本贡献的材料和结构系统的控制。