Layout Design and Analysis of Vibration Damping System for Airborne Optoelectronic Platform

doi:10.3969/j.issn.1004-132X.2026.08.015

Abstract

Abstract:

Airborne optoelectronic detection equipment is a critical component in military applications. To ensure the imaging quality and stabilization accuracy of the optoelectronic platform under airborne vibration environments， an appropriate vibration isolation design is essential. A dynamic model of the vibration isolation system is developed to analyze the effects of isolation stiffness， layout configuration， and the center-of-mass position of the optoelectronic platform on system performance. Results indicate that the optimal layout scheme is to maximize the span of the isolator arrangement while ensuring coincidence between the platform’s center of mass and the stiffness center of the isolation system. Finite element simulation is further conducted on the system layout model under airborne random vibration conditions. The simulation results show that increasing the isolation span significantly suppresses angular vibration near the natural frequency points， achieving a reduction in angular vibration amplitude of up to 70%. A smaller distance between the platform’s center of mass and the stiffness center leads to reduced angular vibration amplitude induced by linear vibration coupling. Strictly controlling this distance to within 5 mm can reduce the root- mean-square （RMS） value of angular vibration by more than 84%. Additionally， increasing the damping ratio of the isolation system effectively attenuates the angular vibration amplitude.

Key words: optoelectronic platform, vibration reduction, angular vibration, stiffness center

摘要：

航空光电探测设备在军事领域得到广泛应用，为保证光电平台在机载振动环境下的成像质量和稳定精度，必须进行合理的减振设计。通过建立减振系统的动力学模型，分析减振刚度、减振系统布局形式以及光电平台质心位置对减振系统性能的影响，发现最大化减振布置跨距并控制光电平台质心与减振刚度中心重合的减振布局方案最优。最后，结合机载随机振动环境对系统减振布局模型进行了有限元仿真分析，结果表明：减振布置跨距的增大对固有频率点附近的角振动有显著抑制作用，角振动幅值降幅可达70%；光电平台质心与减振刚度中心的距离越近，线振动耦合产生的角振动幅度越小，严格控制质心与刚度中心距离小于5 mm，可降低角振动均方根值84%以上；提高减振系统阻尼比，可以有效地减小角振动幅值。

关键词: 光电平台, 减振, 角振动, 刚度中心

CLC Number:

TN206

WANG Weiqi, LU Ming. Layout Design and Analysis of Vibration Damping System for Airborne Optoelectronic Platform[J]. China Mechanical Engineering, 2026, 37(8): 1956-1964.

王玮琪, 鲁明. 机载光电平台减振系统布局设计与分析[J]. 中国机械工程, 2026, 37(8): 1956-1964.

Figures/Tables 15

Fig.1 Curve of the relationship between transmissibility and frequency ratio

Fig.2 Schematic diagram of vibration of the photoelectric platform

Fig.3 Layout diagram of the vibration damping system

Fig.4 Schematic diagram of the center postion of the photovoltaic platform

Fig.5 Schematic diagram of centroid deviation from the center of vibration damping stiffness

Tab.1 The first 6 natural frequencies under different spans S

	S=0 mm	S=180 mm	S=340 mm	S=500 mm
1阶固有频率	15	15	15	15
2阶固有频率	15	15	15	15
3阶固有频率	15	15	15	15
4阶固有频率	18.4	19.5	22.2	26
5阶固有频率	18.4	19.5	22.2	26
6阶固有频率	26	26	26	26

Fig.6 Modal shapes of the first 6 orders of the system

Fig.7 Platform centroid frequency response curve

Fig.8 Frequency response curves of the upper and lower end faces of the platform

Fig.9 Phase response curve of the relative displacement at the upper and lower end faces of the platform at the natural frequency point

Fig.10 Amplitude-frequency response curve of the platform’s angular vibration around the y-axis

Fig.11 Random vibration input spectrum type

Fig.12 3 σdisplacement of the platform in the x-direction

Fig.13 Power spectral density of the vibration angle of the platform around the y-axis

Fig.14 The root mean square value of the vibration angle of the platform around the y-axis

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