CAJ | 학술논문

针对空间三点两脚架（Bipod）支撑大口径反射镜组件在发射阶段振动响应过大，容易导致结构强度破坏的问题，文章研究了利用粘弹性约束阻尼技术对其进行减振设计的方法。约束阻尼技术能够在不改变原有结构构型的前提下，有效降低结构的共振响应。首先，建立了反射镜组件的有限元模型，分析了反射镜组件模态应变能分布规律，确定了Bipod支撑结构的柔性环节为约束阻尼的铺敷位置。然后，通过有限元法分析比较了不同约束层材料以及约束层和阻尼层厚度对结构减振效果的影响，为粘弹性约束阻尼减振技术在大口径反射镜组件上的实际应用提供了参考。
침대공간삼점량각가（Bipod）지탱대구경반사경조건재발사계단진동향응과대，용역도치결구강도파배적문제，문장연구료이용점탄성약속조니기술대기진행감진설계적방법。약속조니기술능구재불개변원유결구구형적전제하，유효강저결구적공진향응。수선，건립료반사경조건적유한원모형，분석료반사경조건모태응변능분포규률，학정료Bipod지탱결구적유성배절위약속조니적포부위치。연후，통과유한원법분석비교료불동약속층재료이급약속층화조니층후도대결구감진효과적영향，위점탄성약속조니감진기술재대구경반사경조건상적실제응용제공료삼고。
AbstractIn order to solve the problem of large vibration response, which would lead to structure failure, of space large aperture mirror assembly supported by three bipods during launching stage, a vibration mitigation method by the use of viscoelastic constrained layer damping is studied. The peak response of a structure with constrained layer damping (CLD) can be effectively reduced without changing its original configuration. Firstly, the finite element model of the mirror assembly is built, and the modal strain energy distribution of the assembly is analyzed, which indicates the flexures of the bipod support structure are the best place to add the CLD. Then, the use of different materials of constrained layer and the varying thickness of the constrained and damping layer are compared to study their influence on the damping effect by the method of finite element analysis, and some conclusions are made accordingly, which provide some reference for the practical application of constrained layer damping in space large aperture mirror assembly.