An airborne optoelectronic stable pod is mounted on a helicopter by pylons. The pod suppresses the impact of strong vibration and large swaying of the aircraft to stabilize the optical axis of the camera and to produce high-definition images under dynamic conditions. First, a passive damping system comprising a mechanical turntable with two axes and four frames for a photoelectronic stable pod is designed. Then the pod’s vibration reduction performance is tested. Additional tests are performed on the vibration of the helicopter and the pylon under flight conditions during the actual power line inspection, test the stabilization precision and imaging effect of the pod under flight conditions. The test results are analysed in detail, and the pod’s stability performances are verified under airborne conditions. The stability precision of the pod is better than 30 μrad (1σ), and a pin of 3-mm diameter can be clearly shot during aircraft hovering. The vibration test shows the pylons do not amplify the vibration of the aircraft while meeting stiffness requirement.

中文翻译：

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用直升机进行电力线路检查的机载稳定吊舱的被动阻尼和振动试验

机载光电稳定吊舱通过挂架安装在直升机上。吊舱抑制飞机强烈振动和大摇摆的影响，稳定相机光轴，在动态条件下产生高清图像。首先，设计了一个被动阻尼系统，包括一个带有两个轴和四个框架的机械转台，用于光电稳定吊舱。然后测试吊舱的减振性能。实际电力线路检查中，对直升机和挂架在飞行条件下的振动进行了附加测试，测试了吊舱在飞行条件下的稳定精度和成像效果。对测试结果进行了详细分析，验证了吊舱在空中条件下的稳定性能。吊舱稳定精度优于30 μrad（1σ），飞行器悬停时可清晰射出直径3mm的销钉。振动试验表明，挂架在满足刚度要求的情况下不会放大飞机的振动。