活塞激光热负荷, 就是利用二元光学转光片(DOE)改变激光在空间的能量分配, 使用电脑控制激光在时间域上的分布, 从而使活塞实现特定的温度分布和波动。二元光学转光片的设计、加工需要知道各区域激光能量分配比例。为此提出了基于有限元优化的激光热负荷试验光强分布设计思想, 建立了光强优化分布模型。模拟结果表明, 二元光学转光片激光辐照区域的3个环(从中心往外)的功率比例为:0.03∶0.01∶9.96,能使活塞的温度分布与设计要求的目标温度一致, 并能模拟活塞的高周、低周疲劳。

To accomplish laser-induced thermal loading simulation tests for pistons, space intensity distribution of laser is changed by diffractive optical element (DOE),and time distribution of laser is controlled with the help of computer. It is necessary to know proportion of intensity distribution for design and process of DOE. Finite mode of intensity distribution is established. Results show temperature distributing of piston is agreement with target temperature distributing when power proportion from center circle to outer circle is 0.03,0.01 and 9.96. Thermal loading of high cycle and low cycle can be simulated by optimization DOE.