风载荷对车载平台稳定性干扰的研究

Investigations on Interference of Wind Loads on the Stability of the Carrier Platform

研究车载平台稳定性优化设计问题,针对车载光电跟踪设备工作环境的复杂性,存在温差、风载荷等外界因素干扰车载平台定位的稳定性。为了分析风载荷对车载平台重复定位稳定性的干扰程度,在车载平台的前支撑腿和后支撑腿处分别建立了数学模型,推算出在风载荷的作用下副车架的挠度公式。使用三维仿真软件MSC.PATRAN生成有限元模型,在三点支撑的状态下对模型进行变形仿真,得到0级、4级、5级、6级风速下的副车架的变形值,综合比较无风状态和不同风速下的副车架变形情况,检验风载荷对车载平台稳定性的干扰情况。实验结果表明,6级风对已对准光路造成了0.3″的误差影响,与20″的工作精度要求相比,承受性能较好。验证了车载光电跟踪设备可以达到6级风环境中的工作性能。

For the complexity of working conditions of the photoelectric tracking equipments, this paper studies stability of the carrier platform. Some external factors such as temperature difference, wind loads can interfere with re -orientation stability of the carrier platform. In order to analyze the degree of interference from wind loads on the re-orientation stability of carrier platform, mathematical models are established in the front supporting legs and the hind supporting legs of the carrier platform. Then deflection formulas of the vehicle frame which is affected by wind loads are calculated. A finite element model is established by using the commercial software MSC. PATRAN. Under the cir- cumstance of three-point support, deformation simulation is carried out and deformations of the vehicle frame under 0 class, 4 class, 5 class, 6 class wind are obtained. The result analysis is committed for four conditions respectively to testify the interference which is from wind loads on the re-orientation stability of the carrier platform. The experimental results show that 6 class wind causes the error of 0.3＂on the aligned optical path, and compared with 20＂ of the working accuracy requirement, the error can be accepted. Therefore, the photoelectric tracking equipment can be able to work well in the environment of 6 class wind.