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为了满足空间相机主支撑结构在强度、刚度和稳定性等方面的要求,根据能量守恒原理,采用基于Rayleigh算法的单位力法,推导了空间相机三角形桁架单元的频率计算公式,研究了桁架杆间夹角对相机主支撑结构频率的影响。以某种桁架式空间相机为例,结合有限元方法对理论计算结果进行了分析验证,并以此为基础对相机的桁架结构进行了优化。结果表明:优化后的相机结构较原方案在X和Y向的频率分别提高了18.01 Hz和27.38 Hz,增加了相机结构刚度,为以后的空间相机主支撑结构设计提供了重要依据。
In order to meet the requirements of strength, rigidity and stability of the main support structure of space camera, according to the principle of energy conservation, the unit force method based on Rayleigh algorithm was used to derive the frequency formula of triangular camera truss unit. Effect of the included angle on the frequency of the main support structure of the camera. Taking a kind of truss space camera as an example, the theoretical calculation results are analyzed and verified with the finite element method. Based on this, the truss structure of the camera is optimized. The results show that the optimized camera structure is 18.01 Hz and 27.38 Hz higher than the original scheme in the X and Y directions respectively, which increases the stiffness of the camera structure and provides an important basis for the future design of the main support structure of the space camera.