激光捷联惯导量化热设计指标控制方法

A Thermal Design Index Control Method Using a Quantified Value for Laser Strapdown Inertial Navigation System

随着机载激光捷联惯导向小型化方向发展,惯导结构的热设计正面临着更加严峻的挑战。针对设计中经常出现因无法在设计前期进行热设计指标控制而导致后期设计返工的问题,提出了一种热设计量化控制方法,即根据估算的整机功率计算箱体外表面积,再对箱体外表面积可达性进行判断,如可达则以该参数作为控制指标进行设计,如不可达则采用可达的最大表面积作为输入反算整机功耗,再根据计算结果对各电路功耗进行重新分配。经有限元仿真计算和试验一致证明该方法有效,可以实现惯导设计前期定量化的热设计控制,在很大程度上避免了后期因热可靠性及热试验问题的设计返工。

With the development of miniaturization of airborne laser strapdown inertial navigation system,the thermal design of inertial navigation structure is facing more severe challenges.During the process of inertial navigation system(INS)design,it frequently comes up the rework because of the inability to control the thermal dissipation in the early stage of design.Aiming at this problem,a method is presented,using which the shell external surface area could be computed and then to be used as a controlling index if it could be realized.Otherwise the maximum shell external surface area value should be input to the controlling equation and a new power value of the INS could be computed as the new index to design the INS system.This effectiveness of this method is proved by both simulations and experiments.It demonstrates that this method could compute the design index in the early stage,so that the rework caused by the possible problems of thermal reliability or thermal test could be avoided.