Model-Based Feedback Control of a kHz-Excited Atmospheric Pressure Plasma Jet
Model-Based Feedback Control of a kHz-Excited Atmospheric Pressure Plasma Jet
复制标题
基于模型的 kHz 激发大气压等离子体射流反馈控制
DOI：
10.1109/trpms.2017.2764629
复制
发表时间：
2018
影响因子：
4.4
通讯作者：
A. Mesbah
中科院分区：
文献类型：
--
作者：
Dogan Gidon;B. Curtis;J. Paulson;D. Graves;A. Mesbah
大气压等离子体射流（APPJs）在材料加工和生物医学领域有着广泛的应用。然而，手持式APPJs的安全有效操作对等离子体特性的内在变异性以及外源干扰（如设备尖端与目标表面的分离距离变化）高度敏感。本文采用比例积分控制策略和模型预测控制（MPC）策略研究了氦气中khz激发APPJ的热效应和强度的反馈控制。应用子空间辨识方法建立了线性工作范围的APPJ数据驱动模型，用于两种控制策略的设计。实时控制实验表明，在器件尖端与表面分离距离存在阶跃扰动的情况下，反馈控制对APPJ的有效运行至关重要。研究发现，MPC策略可以更有效地调节APPJ的多变量动态特性，在面对扰动时实现有效的设定值跟踪和约束处理。
Atmospheric pressure plasma jets (APPJs) have widespread use in materials processing and biomedical applications. Safe and effective operation of hand-held APPJs is, however, highly sensitive to the intrinsic variability of plasma characteristics as well as exogenous disturbances such as variations in the separation distance between the device tip and target surface. This paper investigates feedback control of the thermal effect and intensity of a kHz-excited APPJ in helium using a proportional-integral control strategy and a model predictive control (MPC) strategy. A data-driven model of the APPJ, developed for a linear operating range using the subspace identification method, is utilized in the design of both control strategies. Real-time control experiments reveal that feedback control is crucial for effective operation of the APPJ in the presence of step disturbances in the device tip-to-surface separation distance. It is observed that the MPC strategy can more effectively regulate the multivariable dynamics of the APPJ for effective setpoint tracking and constraint handling in the face of disturbances.