Structural Design and Analysis of Optical Load for Wire-Rope Shock Absorber
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摘要: 为了减小振动对大负载光学载荷在飞行过程中相机成像质量的影响，设计了一种新型向心结构的减震器。针对传统减振器的不足，提出了向心结构的设计方案，可以很好地将力进行解耦，通过在升降板上沿圆环均布的方式排列安装，有效避免了光学载荷内部发生碰撞。为了检验向心结构的减振效果，通过拉伸试验与有限元分析相结合的方式对光学载荷验证。结果表明，在120 kg负载下，整体结构最大变形为3 mm，最大应力为34.3 MPa，实际振型频率为9.81 Hz，均满足设计要求。Abstract: To reduce the effect of vibration on camera image quality during flight under heavy optical loads, a new type of centripetal shock absorber was designed. In view of the shortcomings of traditional shock absorbers, a design scheme for the centripetal structure is proposed that can effectively decouple the force. By uniformly distributing the force along the ring on the lifting plate, collisions within the optical load were effectively avoided. To test the vibration-damping effect of the centripetal structure, the optical load was verified using a combination of tensile tests and finite element analysis. The results showed that under a load of 120 kg, the maximum deformation of the entire structure was 3 mm, the maximum stress was 34.3 MPa, and the actual mode frequency was 9.81 Hz, which met the design requirements.
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Key words:
- optical load /
- shock absorber /
- tensile test /
- finite element analysis
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图 1 单自由度系统钢丝绳减震器的结构简化模型
Figure 1. Simplified structural model of single-degree-of-freedom system wire rope shock absorber
图 4 不同钢丝绳直径的力与位移曲线
Figure 4. Force versus displacement curves for different rope diameters
表 1 不同钢丝绳的直径的刚度系数
Table 1. Stiffness coefficient of different wire rope diameters
Kx Ky Kz 6 mm 206.2 184.6 952.7 5 mm 123.7 119.9 399.8 4 mm 60.1 58.8 185.6 
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表 2 材料参数
Table 2. Material parameters
Materials Elastic modulus/GPa Poisson's ratio Density/(kg/m3) Aluminium alloy 71 0.33 2770 Stainless steel 193 0.31 7750
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表 3 带负载结构的模态分析结果
Table 3. Modal analysis results of loaded structures
Modal order Natural
frequency/HzMode description 1 4.25 Rotate around X axis 2 4.25 Second order bending in the XZ plane 3 9.81 Stretch along the Z axis 4 35.35 First order bending in XZ plane 5 37.37 Stretch along Y axis 6 37.38 Stretch along the X axis
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