车载光电经纬仪支撑平台稳定性研究  

Stability of Supporting Platform for Vehicle-Mounted Optoelectronic Theodolite

作　　者：高庆嘉[1] 王冲 王强龙[1] 王晓明[1] 余毅[1] 刘震宇[1] 刘岩俊[1] Gao Qingjia;Wang Chong;Wang Qianglong;Wang Xiaoming;Yu Yi;Liu Zhenyu;Liu Yanjun(Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Sciences,Changchun 130033,Jilin,China)

机构地区：[1]中国科学院长春光学精密机械与物理研究所,吉林长春130033

出　　处：《光学学报》2023年第21期142-149,共8页Acta Optica Sinica

基　　金：国家自然科学基金(51675506)。

摘　　要：传统的车载支撑平台晃动量较大,难以满足车载光电经纬仪高精度不落地测量要求。为了兼顾轻量化、高刚度和便于制造的要求,采用离散体桁架拓扑优化方法设计了一种具有桁架蒙皮式结构的高比刚度车载支撑平台;建立了平台系统的有限元仿真模型,根据平台安装光电经纬仪的稳定性要求,分析了不同工况和载荷条件下平台系统的静力学和模态特性,搭建了支撑平台稳定性实验装置。结果表明,在经纬仪工作角加速度0.5(°)/s2~20(°)/s2范围的激励下,经纬仪基座的响应加速度为0.008~0.55 m/s2,无明显影响经纬仪跟踪性能的共振响应发生。同时,采用倾角传感器测量了平台晃动幅值,最大晃动量为7.2″。该支撑平台具有较高的支撑稳定性,适用于车载光电经纬仪高精度不落地测量。Objective Traditional vehicle-mounted supporting platforms have large shaking amounts and are difficult to meet the requirements of high and non-landing measurement accuracy of the vehicle-mounted optoelectronic theodolite.We design a novel supporting platform with the truss skinned structure based on a discrete topology optimization method with considering the demand for high stability,light weight,and easy manufacturing.The vehicle-mounted theodolite characterized by stronger mobility,faster,and more convenient deployment processes,has been the major trend in test ranges.The supporting platform provides a new measurement reference for vehicle-mounted theodolite.Therefore,the stability of the supporting platform is an important factor enabling theodolite to achieve high-accuracy measurement.Due to the limited size,weight conditions,and dynamic characteristics of theodolite,the platform stability is consistently low.Generally,the shaking amount is over 40″,even up to hundreds of arc seconds.Some appropriate correction methods can be employed to improve the pointing accuracy of the theodolite,but the timeliness is limited.As a result,it is necessary to design a kind of supporting platform featuring high stiffness,good dynamic characteristics,and light weight.Methods A truss discrete topology optimization method is adopted to design the supporting platform.The platform frame is established according to its basic shape,and the design domain and non-design domain of the structure are also determined according to the finite element grids.The solid isotropic material with penalization(SIMP)interpolation model is adopted in the topology optimization.The minimum flexibility is set as an objective function and the volume fraction as a constraint.The topology optimization layout is then obtained(Fig.3).Based on the above topology optimization results,a detailed model of the optimized platform system,which consists of theodolite,platform,and lifting legs,is developed for simulation(Fig.5).The platform truss structure is d

关 键 词：车载光电经纬仪 不落地测量 支撑平台 稳定性 

分 类 号：TH743[机械工程—光学工程]