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卫星平台的振动,电磁干扰,温度变化对空间红外探测器的成像质量有很大的影响。为了减小外部干扰对像质的影响,为空间红外探测器设计了一套保护结构。首先应用新型材料—铝基复合材料制作了探测器的屏蔽罩,设计的屏蔽罩不仅质量轻,刚度大,而且电磁屏蔽效果显著。其次在探测器和外部支撑结构的连接中采用了柔性支撑橡胶环。应用变刚度变阻尼方法对柔性支撑结构的迟滞阻尼特性进行了建模和参数识别。应用参数识别的结果建立了整个系统的动力学方程,得到探测器质心位置的最大加速度为21.32m/s2(155Hz)。系统在325Hz后,加速度传递率小于0.5,可以有效的隔离外部振动的干扰。最后把仿真结果与振动试验计算结果进行对比,最大误差为5.25%,进一步证明了计算的正确性。说明了这种保护结构在航天遥感领域具有一定的应用价值。
Satellite platform vibration, electromagnetic interference, temperature changes on the spatial infrared detector imaging quality has a great impact. In order to reduce the impact of external interference on image quality, a set of protection structure is designed for the space infrared detector. First of all, a new type of material-aluminum-based composite material was used to fabricate the detector’s shielding cover. The designed shielding cover not only has the advantages of light weight, high rigidity, but also remarkable electromagnetic shielding effect. Second, a flexible support rubber ring is used in the connection of the detector to the external support structure. The variable damping method with variable stiffness is used to model and parameterize the hysteretic damping of flexible support structures. Based on the results of parameter identification, the dynamic equation of the whole system was established. The maximum acceleration of the center of mass of the detector was 21.32m / s2 (155Hz). The system after 325Hz, the acceleration transmission rate is less than 0.5, can effectively isolate the external vibration interference. Finally, the simulation results and vibration test results were compared, the maximum error of 5.25%, to further prove the accuracy of the calculation. It shows that this kind of protection structure has certain application value in the field of space remote sensing.