what is mean of sliding mode controller? and advantage and dis advantage ?
Answers
Explanation:
Sliding mode control (SMC) is a nonlinear control technique featuring remarkable properties of accuracy, robustness, and easy tuning and implementation. SMS systems are designed to drive the system states onto a particular surface in the state space, named sliding surface.
The main disadvantages of SMC are the chattering problem. The chattering is the natural price that the SMC pays in order to 1) eliminate completely the matched external disturbances 2) replace the original system by a new certain one, which created according to the desired features, and maybe with a lower order. This elimination and creation are the main advantages of SMC.
A classic Sliding Mode Control (SMC) has many advantages like precise tracking and robustness against disturbances and unpredicted inaccuracies which are existing in a system like UAVs. However, the classic SMC has some disadvantages that may cause huge damage in the system that is: chattering problem.
Some modifications has been applied to the classic SMC in order to overcome this problem and improve its performance. I made a modification on SMC and used adaptive control and Computational Intelligence control technique and came up with good results.
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Answer:
In control systems, sliding mode control (SMC) is a nonlinear control method that alters the dynamics of a nonlinear system by application of a discontinuous control signal (or more rigorously, a set-valued
control signal) that forces the system to "slide" along a cross-section of the system's normal behavior.
ADVANTAGES- The fuzzy controller is used to adjust the switching gain constant in the sliding mode controller to guarantee the system stability and practically to eliminate the chattering problem. The performance of the proposed system is compared with that of traditional sliding mode under different operating conditions.
DISADVANTAGES- Another main disadvantage of the conventional sliding mode control scheme is that the performance of the controller heavily depends on the sliding surface. If the sliding surface of sliding mode controller is not designed properly, it may lead to unacceptable performance.
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