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Control Systems in Practice, Part 4: Why Time Delay Matters

Time delays are inherent to dynamic systems. If you’re building a controller for a dynamic system, it’s going to have to account for delay in some way. Time-Delay Systems: Analysis and Design with MATLAB and Simulink: Time delays exist in two varieties: signal distorting delays, like phase lag, in which each frequency is delayed by a different amount of time, resulting in a distorted signal shape; and non-distorting transport delays, in which the entire signal is postponed by the same amount of time. Phase lag and transport delays are introduced into the system through a number of different components and processes, and understanding how delay enters your system will help you figure out the best way to deal with it. This video covers time delays, where they come from, and why they matter.

Part 1 - What Control Systems Engineers Do Part 2 - What is Gain Scheduling? Part 3 - What is Feedforward Control?
Part 5 - A Better Way to Think About a Notch Filter

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