摘要
为了提高红外导引头稳定平台动态性能,减小振动环境对其稳定精度和光电载荷成像质量的影响,采用基于变密度法的拓扑优化理论,利用NX/TOSCA软件,以刚度最大化为目标函数,以体积比约束为设计响应约束,对红外导引头稳定平台主框架进行了拓扑优化设计。对比分析了经优化设计和经验设计的主框架结构形式的刚度及模态振型。结果显示,经拓扑优化的主框架在动态性能有所提高的情况下,结构质量大幅地减小,最大变形量由3.2μm减小到2.8μm,一阶固有频率由1 567 Hz提高到1 953 Hz,质量减小32.4%,有利于导引头轻量化水平的提升和整机性能的提高。最后,通过振动试验和稳定精度的检测数据验证了主框架的动态性能,说明了拓扑优化结果的正确性,这种拓扑优化方法可为其他重要件结构设计提供帮助。
In order to improve the dynamic performance of infrared seeker＇s stabilization platform and diminish the negative effect of vibration environment on the stabilized accuracy and image quality of electro-optical load, a topology optimization based on the variable density theory was studied. In the topology optimization of the main frame of infrared seeker＇s stabilization platform, the maximum stiffness was taken as an objective function and the volume ratio constraint was taken as response functions by using the software of NX/TOSCA. The stiffness and modal performance of the main frame structure after optimization were analyzed by comparing with experience design. The results show that the mass of the main flame is reduced tremendously by 32.4% under the condition of the improved dynamic performance, the maximum deformation is reduced from 3.2 μm to 2.8 μm, and the first order natural frequency isimproved from 1 567 Hz to 1 953 Hz, that is beneficial to the lightweight level of ascension and the performance improved. Finally, the dynamic performance of the main frame is verified by vibration test and stabilized accuracy test, which proved the result of the topology optimization. This topology optimization method will provide help to structure design of the other important parts.
出处
《红外与激光工程》
EI
CSCD
北大核心
2016年第2期208-212,共5页
Infrared and Laser Engineering
基金
国家"863"计划(2013AA122102)
国家"973"计划(2009CB7240020603B)
关键词
机械设计
拓扑优化
变密度法
红外导引头
mechanical design
topology optimization
variable density method
infrared seeker
