论文部分内容阅读
五百米口径射电望远镜(FAST)采用柔性索网作为主要支承结构,根据拟定的变位策略要求,通过促动器连接下拉索控制索网变位实现巡天观测。由于变位观测过程中索网将长期承受高达约500MPa的疲劳载荷,约为目前相关标准规定值的两倍多,故索网结构将是该望远镜中的关键易损部位。为此,该文以索网结构后期运行、监测及维护为背景,通过量纲分析方法明确影响索网变位应力幅值的主导因素,基于大型有限元软件ANSYS建立索网模型进行连续变位仿真分析,探索合理的变位策略以降低索网变位过程中的应力变化幅值,提高索网运行的可靠性。
The 500-meter radio telescope (FAST) adopts the flexible cable network as the main support structure. According to the requirements of the proposed displacement strategy, the anchor cable is connected to the cable to control the displacement of the cable network for day-long observation. Since the cable network will bear the fatigue load of up to about 500 MPa for a long time during the displacement observation, which is about twice as much as the current relevant standard, the cable network structure will be the key vulnerable part of the telescope. Therefore, based on the post-operation, monitoring and maintenance of cable network structure, the paper analyzes the dominant factors affecting the stress amplitude of cable network displacements through dimensional analysis method. Based on the large-scale finite element software ANSYS, Simulation analysis is carried out to explore reasonable displacement strategy to reduce the magnitude of stress changes in cable network displacement and to improve the reliability of cable network operation.