摘要
超小型稳定平台照准架是保证平台指标精度实现的关键结构件。为了减小稳定平台照准架的质量和体积,对其结构形式和受力情况进行了研究,采用NX/N astran软件对照准架结构进行了仿真分析,依据结果对照准架结构进行了优化设计。优化结果使照准架的质量减小到88 g,占其质量的30%,有利于稳定平台轻量化设计。对优化后的照准架进行了模态分析和热分析。模态分析显示,照准架主体一阶频率为415 H z;热分析显示,照准架在120°C温差作用下变形大小为0.083 mm,满足飞机总体性能指标的要求。最后通过对稳定精度和测角精度的检测以及振动和高低温试验及外场飞行试验,验证了仿真分析的正确性,表明对照准架的优化设计是成功的。
The aiming frame of photoelectric stabilized platform for small unmanned aerial vehictes（UAVs） is the key component that ensures accuracy index of platform. In order to reduce the mass and the size of the component, the aiming frame structure and the case of their force are studied with NX/Nastran. Then, the optimization design of the aiming frame structure is achieved according to the analysis results. The results show that the mass of the aiming frame is reduced by 88 g, which is 30% of the primary weight, and that is beneficial to lightweight design of the platform. The modal analysis and thermal analysis are carried out on the optimized aiming frame. It indicates that the aiming frame＇s first-order natural frequency is 415 Hz by modal analysis and the thermal deformation of the aiming frame is 0. 083 mm in the temperature difference of 120 ℃ by thermal analysis. The analysis results meet overall performance indexes of aircraft. Finally, through the stabilized accura- cy and angle measurement accuracy test, vibration test, high and low temperature tests and flight test, the correctness of the simulation analysis are proved, which indicates that the optimized design of the aiming frame is successful.
出处
《南京航空航天大学学报》
EI
CAS
CSCD
北大核心
2013年第1期104-109,共6页
Journal of Nanjing University of Aeronautics & Astronautics
基金
国家高技术研究发展计划("八六三"计划)(2008AA121803)资助项目
国家重点基础研究发展计划("九七三"计划)(2009CB72400607)资助项目
关键词
超小型无人机
照准架
结构优化
稳定平台
small unmanned aerial vehicles （UAVs）
aiming frame
structure optimization
stabilized platform
