Estimation of Deformation and Improvement of Shape Accuracy of Gossamer Space Structure

游丝结构是由非常薄的弹性体，如膜，聚合物网和电缆组成的结构。在该项目中，作者通过数值分析程序表明，折叠线的非弹性行为，（2）膜的自接触，（3）由小扰动（如热应变）引起的褶皱对展开运动和展开后结构的动力行为产生严重影响。提出了一种卷起式充气管的展开方法，制作了样机，并进行了展开实验。实验结果表明，该方法比传统方法简单，能更稳定地展开管道，且易于控制展开速度。利用有限元软件LS-DYNA对该管的展开过程进行了数值模拟，模拟结果与实验结果吻合较好。作者inv ...更多信息 摘要研究了通过改变索的长度来控制膜结构的形状，提出了一种基于构件刚度和无应力形状识别的形状控制方案。数值计算结果表明，该方法能够以较少的形状调整次数实现形状控制。作者将这些结果应用于日本JAXA研究的旋转太阳帆飞行模型的分析。他分析了几个参数对帆膜展开行为的影响，即（1）帆膜的压缩刚度，（2）角速度，（3）帆膜的尺寸等，根据这些结果，他提出了三个评价帆膜展开运动的指标，即（1）帆膜的压缩刚度，（2）角速度，（3）帆膜的尺寸等。（1）展开比，（2）累积应变能密度，和（3）最大应变能的频率。他指出，这些指数可用于比较和评估折叠模式以及部署方法。少

The gossamer structure is the structure that consists of extraordinary thin elastic bodies such as membranes, polymer meshes, and cables. In this project, the author showed by using his numerical analysis code that the inelastic behavior of the fold lines, (2)self-contact of the membrane, and (3)the wrinkles caused by small disturbances such as thermal strain gives serious effect on the deployment motion and the dynamic behavior of the structure after the deployment. The author and the colleagues proposed a deployment method of rolled-up type inflatable tube, made an prototype, and conducted a deployment experiment. The experimental results showed that the proposed method is much more simple and can deploy the tube more stably than the conventional methods, and it can control the deployment speed easily. The author conducted the numerical simulations of the deployment of the tube by using the commercial FEM code "LS-DYNA", which agrees well with the experimental results. The author inv … More estigated the shape control of membrane structures by changing the length of the cables which supports the structures at their boundaries, and proposed a shape control scheme based on the identification of the stiffness of the structural members as well as their unstressed shape. The numerical results showed that the proposed method can control the shape with less numbers of shape adjustment. The author applied these results to the analysis of the flight model of the spinning solar sail investigated by JAXA, Japan. He analyzed the effect of several parameters on the deployment behavior of the sail membrane, i.e. (1)the compressive stiffness of the membrane, (2)angular velocity, (3)the size of the membrane, and so on. From these results, he proposed three indices to evaluate the deployment motion of the sail membrane, ie. (1)the deployment ratio, (2)the cumulative strain energy density, and (3)the frequency of the maximum strain energy. He showed that these indices can be used for the comparison and the evaluation of the folding patterns as well as the deployment methods. Less