Title: Sub-Structuring Modeling of Large Space Truss Structures for Structure/Control Optimization in Presence of Parametric Uncertainties Show Chinese title

Title: 大型空间桁架结构在存在参数不确定性情况下的结构/控制优化的子结构建模

Abstract: Modern and future high precision pointing space missions face increasingly high challenges related to the widespread use of large flexible structures. The development of new modeling tools which are able to account for the multidisciplinary nature of this problem becomes extremely relevant in order to meet both structure and control performance criteria. This paper proposes a novel methodology to analytically model large truss structures in a sub-structuring framework. A three dimensional unit cube element has been designed and validated with a Finite Element commercial software. This model is composed by multiple two-dimensional sub-mechanisms assembled using block-diagram models. This constitutes the building block for constructing complex truss structures by repetitions of the element. The accurate vibration description of the system and its minimal representation, as well as the possibility of accounting for parametric uncertainties in its mechanical parameters, make it an appropriate tool to perform robust Structure/Control co-design. In order to demonstrate the strengths of the proposed approach, a co-design study case is proposed by combining a multidisciplinary optimization approach based on particle swarm algorithm and multiple structured robust Hinf-synthesis. This has been used to optimize the pointing performances of an high pointing antenna, minimizing the perturbations coming from the Solar Array Mechanisms (SADM) of two solar panels, performing active control by means of multiple proof mass actuators, and simultaneously reduce the mass of the truss-structure which connects the antenna to the main spacecraft body. Show Chinese abstract

Abstract: 现代和未来的高精度指向空间任务面临着由于广泛使用大型柔性结构而带来的日益严峻的挑战。 开发能够考虑该问题多学科性质的新建模工具变得极其重要，以满足结构和控制性能标准。 本文提出了一种新方法，在子结构框架中对大型桁架结构进行解析建模。 设计并验证了一个三维单元立方体元素，使用商用有限元软件进行了验证。 该模型由多个二维子机制组成，这些子机制通过方框图模型进行组装。 这构成了通过重复该元件构建复杂桁架结构的基本单元。 对该系统的准确振动描述及其最小表示，以及在机械参数中考虑参数不确定性可能性，使其成为执行鲁棒结构/控制协同设计的合适工具。 为了展示所提出方法的优势，通过结合基于粒子群算法的多学科优化方法和多个结构化鲁棒Hinf综合方法，提出了一个协同设计案例。 该方法被用于优化高指向天线的指向性能，最大限度地减少来自两个太阳能板的太阳能阵列机械装置（SADM）产生的扰动，通过多个证明质量作动器进行主动控制，并同时减少连接天线与主航天器主体的桁架结构的质量。