阻尼柔性连接在卫星结构中的综合应用研究

Research into the Integrative Application of Damped Flexible Connector in Spacecraft Structures

卫星结构的热变形是影响卫星光学有效载荷指向精度的主要因素之一,在对国内某在研卫星的有效载荷安装平台热变形过大问题进行分析之后,综合考虑卫星在轨的抖振抑制和发射段减振问题,本文提出了采用高阻尼柔性连接的结构设计来综合解决这三方面的结构问题。阻尼柔性连接结构以金属橡胶制备,充分利用了其非线性刚度和高阻尼比等特性。对卫星设计阶段提出的三种结构方案进行了数值仿真计算,结果表明,金属橡胶阻尼柔性连接结构设计方案能有效的减小有效载荷安装平台的热变形,并抑制卫星在轨抖振和发射段振动,因而具有最佳的综合性能。

Thermal deformation is a main source affecting the pointing accuracy of the optical system on a satellite. For solving the thermal deformation problem of a satellite under developing, a damped flexible connection design is proposed which can simuhaneously attenuate the on-orbit jitter, which deteriorates the quality of images, and the vibration during launch, which is harmful to the safety of the payloads. The damped flexible connector is made of metallic rubber （MR） which has non-linear stiffness and high damping ratio. Numerical results show that the damped flexible connection design can have satisfied performance in simultaneously decreasing the thermal deformation, suppressing the on-orbit jitter and attenuating the vibration during launch.