宽幅面阵摆扫相机结构优化设计

为实现航拍相机的轻小化,设计一款安装在某无人机前腹安装板上的宽幅面阵摆扫相机并对其主框架进行优化设计。首先,根据无人机安装板的结构限制对摆扫机构进行总体设计;然后,应用OptiStruct软件对摆扫机构主框架的尺寸进行优化设计;之后,采用有限元分析法分别对摆扫机构主框架和摆扫机构整体进行模态分析、不同工况下的静力学分析和随机振动分析;最后,为摆扫机构做Y向的正弦扫频试验。优化后主框架的质量为1.2 kg;摆扫机构固有频率避开了振源激振频率;摆扫机构最大应力为62.35 MPa,最大变形为1.03 mm;减振器共振频率处的频率值为27 Hz。宽幅面阵摆扫相机基本满足相机轻小化的要求,摆扫机构固有频率、应力和变形均满足设计要求。

Optimal Design of Wide Area Array Sweeping Camera

In order to realize the lightening of aerial camera, a wide-area array sweep camera installed on the front web mounting board of an unmanned aerial vehicle (UAV) is designed and its main frame is optimized. Firstly, the overall design of the swing mechanism is carried out according to the structural limitation of the UAV mounting plate. Then, the size of the main frame of the swing mechanism is optimized by using OptiStruct software. After, the modal analysis, static analysis and random vibration analysis of the main frame and the whole swing mechanism of the swing mechanism under different working conditions are carried out respectively by using finite element analysis method. Finally, the sinusoidal sweep test in Y direction is carried out for the sweep mechanism. After optimization, the mass of the main frame is 1.2 kg, the natural frequency of the swing mechanism avoids the excitation frequency of the vibration source, the maximum stress and deformation of the swing mechanism are 62.35 MPa and 1.03 mm, respectively, and the frequency value at the resonance frequency of the shock absorber is 27 Hz. Wide area array swing camera basically meets the requirements of lightening and miniaturization. The natural frequency, stress and deformation of the swing mechanism meet the design requirements.