大口径元件面形对离散支撑的频域响应特性

 针对口径为600 mm的薄型镜面在多点支撑情况下，分析了不同支撑方案的元件面形在频率域的响应特性，建立了离散支撑单元的1维梁模型，讨论了峰谷值、均方根值分别作为支撑方案优化目标函数的可行性，计算结果说明峰谷值、均方根值均不能正确评价面形在频率域的响应。分析了支撑单元的间距和大小对频率域的响应特性。根据计算结果，给出了理想支撑方案：中心支撑单元直径10 mm，外侧支撑单元直径10 mm，支撑单元间距125 mm。

Frequency-response characteristics of dispersed support for the surface of large-aperture components

In the case of the multi-point support for a thin mirror with a diameter of 600 mm, the paper studied the frequency-response of components’ surface, which was influenced by different support schemes. A one-dimensional beam model of dispersed support units had been established. The feasibility of the peak-to-valley(P-V), RMS values as support optimization objective functions was discussed. The result is that the values of P-V, RMS can not be the correct evaluation of the surface in the frequency domain response. Then, the frequency-response characteristics influenced by the interval and size of support units were analyzed. According to the results, the ideal support scheme is: the diameters of the center and lateral support units are 10 mm; the support unit interval is 125 mm.