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- Variable structure control (VSC) is a form of discontinuous nonlinear control. The method alters the dynamics of a nonlinear system by application of a high-frequency switching control. The state-feedback control law is not a continuous function of time; it switches from one smooth condition to another. So the structure of the control law varies based on the position of the state trajectory; the method switches from one smooth control law to another and possibly very fast speeds (e.g., for a countably infinite number of times in a finite time interval). VSC and associated sliding mode behaviour was first investigated in early 1950s in the Soviet Union by Emelyanov and several coresearchers. The main mode of VSC operation is sliding mode control (SMC). The strengths of SMC include:
* Low sensitivity to plant parameter uncertainty
* Greatly reduced-order modeling of plant dynamics
* Finite-time convergence (due to discontinuous control law) The weaknesses of SMC include:
* Chattering due to implementation imperfections
* Over-focus on matched uncertainties (i.e., uncertainties that enter into the control channel) However, the evolution of VSC is an active area of research. (en)
- 变结构控制（Variable structure control、VSC）是一種不连续的非線性控制，會用高頻切換的方式來調整非線性系統的动態。其状态反馈的控制律不是時間的连续函数，會在幾個連續函數之間進行切換，因此控制器的結構會依其系統狀態所在的位置以及其軌跡而不同。变结构控制會在一些平滑的控制律之間切換，而且可能是很高速的切換。变结构控制以及相關的滑動模式特式最早是由蘇聯的Emelyanov等研究者在1950年代初期所提出的。 变结构控制的主要控制模式是滑動模式控制（SMC），其優點有：
* 對受控體參數不確定性的敏感度低
* 大幅縮減受控體動態建模的階數
* 有限時間內會收斂（因為非連續控制律的效果） 其缺點有：
* 在實際系統上會有高頻的切跳（chatter）。
* 過度注重不確定量的影響 有關滑動模式控制的研究仍是目前控制理論研究的熱門領域之一。 (zh)
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- 变结构控制（Variable structure control、VSC）是一種不连续的非線性控制，會用高頻切換的方式來調整非線性系統的动態。其状态反馈的控制律不是時間的连续函数，會在幾個連續函數之間進行切換，因此控制器的結構會依其系統狀態所在的位置以及其軌跡而不同。变结构控制會在一些平滑的控制律之間切換，而且可能是很高速的切換。变结构控制以及相關的滑動模式特式最早是由蘇聯的Emelyanov等研究者在1950年代初期所提出的。 变结构控制的主要控制模式是滑動模式控制（SMC），其優點有：
* 對受控體參數不確定性的敏感度低
* 大幅縮減受控體動態建模的階數
* 有限時間內會收斂（因為非連續控制律的效果） 其缺點有：
* 在實際系統上會有高頻的切跳（chatter）。
* 過度注重不確定量的影響 有關滑動模式控制的研究仍是目前控制理論研究的熱門領域之一。 (zh)
- Variable structure control (VSC) is a form of discontinuous nonlinear control. The method alters the dynamics of a nonlinear system by application of a high-frequency switching control. The state-feedback control law is not a continuous function of time; it switches from one smooth condition to another. So the structure of the control law varies based on the position of the state trajectory; the method switches from one smooth control law to another and possibly very fast speeds (e.g., for a countably infinite number of times in a finite time interval). VSC and associated sliding mode behaviour was first investigated in early 1950s in the Soviet Union by Emelyanov and several coresearchers. (en)
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- Variable structure control (en)
- 变结构控制 (zh)
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