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Real-Time Control Lecture - MAELabs UCSD

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Robustness<br />

A closed-loop system exhibits robustness if its response characteristics are<br />

insensitive to parameter variations and noise.<br />

Parameter variations are likely to occur through normal wear<br />

Expected wear should be considered as part of the overall life cycle design<br />

Noise may depend on environment and operating conditions<br />

Gain and phase margins are traditional measures of robustness<br />

Gain margin measures tolerance to loop gain variations<br />

Phase margin indicates tolerance to loop phase variations<br />

Phase margin also measures tolerance to loop time delay<br />

Other robustness tests are possible using a model simulation<br />

Consider random variations in each model parameter<br />

Robustness results become part of your system's performance specification<br />

MAE 156A<br />

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