Dynamics and Vibrations of Cable-Harnessed Structures Motivated by Space Applications

在空间发射卫星系统的高成本一直是减少这些成本的空间结构轻量化设计的一个重要动机。在这方面，充气技术在发射时可以压缩成几英寸厚的折叠堆叠，然后充气并部署在数百英尺以上的空间，在空间放置更大的计量系统以提高覆盖范围，同时满足发射成本和质量目标，取得了革命性的一步。虽然这些结构因其轻巧的设计而备受赞誉，但它们的动态性能可能会受到额外组件的严重影响，例如太空飞行电缆。在传统空间结构中，电力电缆与有效载荷质量的比例可高达20%，而对于充气结构，由于其重量轻得多，因此大大增加了电缆的重量。美国空军研究实验室进行的飞行程序测试是第一批确定空间结构动力学的复杂性被放大的测试之一，当结构元件被利用到信号和电力电缆上时。这些复杂性，再加上由于充气装置的大尺寸，在发射前进行全系统地面测试是不可行的，这就要求需要更准确的模型来考虑电缆的动态效应。因此，我的研究计划的长期目标是开发分析工具，以准确地模拟所有类别充气空间技术的有效载荷上太空飞行电缆的复杂动态影响。为了帮助实现这一目标，这项为期五年的研究计划将专注于开发新颖、高保真、简单和有效的分析工具，这些工具在计算上高效，以了解航天缆索对有效载荷板状结构和复合圆柱形吊杆的动态影响，并最终优化缆索的放置以提高其动力学性能。作为加拿大唯一研究太空电缆对有效载荷结构的动态影响的实验室，也是加拿大三个进行充气技术研究的实验室之一，我将继续为总部提供独特的培训机会，这些机会将被航天行业以及CSA、MDA和普拉特-惠特尼加拿大公司等公司所需要。此外，HQP在动力学和振动方面获得的更广泛的技能将使它们适合汽车和能源行业。此外，拟议的计划将直接使许多科学和工程任务在监测北极、气候变化、海洋学、工程计量学、地球水循环观测和林业方面受益。最终，预计在大约10年后的长期目标中，超轻型充气空间技术中开发的技术的全面实施将通过安装发射成本低得多的高保真计量系统来显著推动该领域的发展，并将对航天工业和加拿大经济产生持续影响。

The high costs for launching satellite systems in space have been a significant motivation for the lighter design of space structures to reduce these costs. In this regard, inflatable technology that can be compressed into folded stacks of a few inches of thickness during launch before inflation and deployment over hundreds of feet in space has gained a revolutionary step in placing larger metrology systems in space to improve their coverage while meeting the launch costs and mass goals. While prized for their lightweight designs, the dynamic behaviour of these structures can be heavily impacted by additional components such as space flight cables. The ratio of power cables to payload mass can be up to 20% in a traditional space structure and increases significantly for inflatable structures due to their much smaller weight. Flight program tests performed by the US Air Force Research Labs were among the first to identify that the complexities of space structure dynamics are magnified when structural elements are harnessed to signal and power cables. These complexities, coupled with the unfeasibility of full system ground-based tests before launch due to the large size of inflatables, mandate the need for more accurate models that incorporate the dynamic effects of cables. Therefore, the long-term goal of my research program is to develop analytical tools to accurately model the complex dynamic effects of space flight cables on payloads for all classes of inflatable space technologies. To help achieve this goal, the five-year research program will focus on the development of novel, high-fidelity, simple, and effective analytical tools that are computationally efficient to understand the dynamic impacts of space flight cables on payload plate-like structures and composite cylindrical booms, and ultimately optimization for cables' placements to improve their dynamics. Being the only lab in Canada to perform research on space flight cables dynamic impacts on payload structures and also one of the three labs in Canada to conduct research on inflatable technologies, I will continue to provide the HQP with unique training opportunities that will be in demand by the space industry and companies like CSA, MDA, and Pratt and Whitney Canada. Also, the broader set of skills gained by the HQP on dynamics and vibrations will make them suitable for the automotive and energy industries. In addition, the proposed plan will directly benefit many science and engineering missions in monitoring the Arctic, climate change, oceanography, engineering metrology, Earth's water cycle observations, and forestry. Ultimately, the full implementation of the developed techniques in ultra-light inflatable space technology, anticipated in about ten years for the long-term goal, will significantly advance the field through placing high-fidelity metrology systems with substantially lower launch costs and will have a sustained impact on the space industry and the Canadian economy.