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首页> 外文期刊>Journal of Crystal Growth >Stabilizing detached Bridgman melt crystal growth: Model-based nonlinear feedback control
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Stabilizing detached Bridgman melt crystal growth: Model-based nonlinear feedback control

机译:稳定分离的Bridgman熔体晶体生长:基于模型的非线性反馈控制

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摘要

The dynamics and operability limits of a nonlinear-proportional-integral controller designed to stabilize detached vertical Bridgman crystal growth are studied. The manipulated variable is the pressure difference between upper and lower vapor spaces, and the controlled variable is the gap width at the triple-phase line. The controller consists of a model-based nonlinear component coupled with a standard proportional-integral controller. The nonlinear component is based on a capillary model of shape stability. Perturbations to gap width, pressure difference, wetting angle, and growth angle are studied under both shape stable and shape unstable conditions. The nonlinear-PI controller allows a wider operating range of gain than a standard PI controller used alone, is easier to tune, and eliminates solution multiplicity from closed-loop operation.
机译:研究了用于稳定垂直布里奇曼晶体生长的非线性比例积分控制器的动力学和可操作性极限。调节变量是上,下蒸汽空间之间的压力差,调节变量是三相线处的间隙宽度。该控制器由基于模型的非线性组件和标准比例积分控制器组成。非线性分量基于形状稳定性的毛细模型。研究了在形状稳定和形状不稳定条件下对间隙宽度,压差,润湿角和生长角的扰动。与单独使用的标准PI控制器相比,非线性PI控制器允许更大的增益工作范围,更易于调整,并且消除了闭环操作带来的解决方案繁琐。

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