空间光学相机结构中的机械结合面模型分析

机械结合面是影响结构动力学特性的重要因素,但在空间相机结构设计和分析中却很少应用。着重研究了两种螺栓结合面模型的动力学特性。首先,基于弹簧一阻尼单元模型和虚拟材料模型理论,建立了试验件的两种模型,并确定模型的参数。弹簧阻尼单元参数采用理论和实验结合的方法确定,虚拟材料模型的参数根据模型理论公式确定。然后,通过有限元计算,对比分析了两种模型在有限元情况下的试验件模态。最后比较了两种模型动力学特性的优缺点。结果表明,弹簧阻尼单元模型的振型与实际模态情况较吻合,虚拟材料模型的低阶固有频率值与实际模态情况较吻合。结果为结合面动力学模型在空间相机结构分析中的应用提供了依据。

Analysis of Mechanical Joint Model of Space Camera Structure

Although the mechanical joint face plays an important role in the field of structural dynamics, few applications of it are found in the design and analysis of space camera structures. The dynamics of two kinds of bolt joint face models are studied mainly. First, two kinds of sample models are established and their parameters are determined according to the spring-damp joint model and the virtual material model theory. The parameters of the spring-damp joint model are determined by combining theory with practice while the parameters of the virtual material model are determined according to the model theoretical formulas. Then, the sample modality of two kinds of models under the finite element condition is compared and analyzed through finite element calculation. Finally, the advantages and disadvantages of two kinds of model dynamics are compared. The result shows that for the spring-damp joint model, the vibration mode fits well with the actual mode while for the virtual material model, the low order natural frequency value fits well with the actual modality. It provides the basis for the application of joint face dynamics models in the analysis of space camera structures.