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为了确保工作在复杂环境中的航空相机能顺利完成任务,对其热控制技术进行了研究。分析了相机的热环境,建立了其换热模型并给出了外热流的计算方法。针对航空相机所处的复杂飞行环境及所需的热控指标,详细阐述了相机的热设计方案,利用热分析软件IDEAS-TMG建立了相机的有限元模型并对相机的两个极端工况进行了仿真分析。仿真分析结果表明:在两个极端工况中,主镜筒温度水平18±1℃、主镜筒轴向温差不大于1.5℃和周向温差不大于1.85℃,均达到了热控指标要求,热设计方案合理可行。该研究方法对各类航空相机的热设计和热分析有一定的指导和借鉴作用。
In order to ensure that the aerial camera working in a complex environment can successfully accomplish its task, its thermal control technology has been studied. The thermal environment of the camera was analyzed, the heat transfer model was established and the calculation method of external heat flow was given. Aiming at the complex flight environment and the required thermal control index, the thermal design scheme of the camera is expounded in detail. The finite element model of the camera is established by the thermal analysis software IDEAS-TMG and the two extreme working conditions of the camera are carried out Simulation analysis. The simulation results show that the main barrel temperature is 18 ± 1 ℃, the main barrel axial temperature difference is less than 1.5 ℃ and the circumferential temperature difference is less than 1.85 ℃ in both extreme conditions, which meet the requirements of thermal control index, Thermal design is reasonable and feasible. The research method has certain guidance and reference for the thermal design and thermal analysis of all kinds of aerial cameras.