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Sensitivity of control sys to parameter variations - help!!!

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powersys

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The following text was copied from Control Systems Engineering by Norman S. Nise (2nd edition).

During the design process, the engineer may want to consider the extent to which changes in system parameters affect the behavior of a system. Ideally, parameter changes due to heat or other causes should not appreciably affect a system's performance. The degree to which changes in system parameters affect system transfer functions, and hence performance, is called sensitivity. A system with zero sensitivity (i.e. changes in the system parameters have no effect on the transfer function) is ideal. The greater the sensitivity, the less desirable is the effect of a parameter change.
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I have little doubt on the highlighted part, which sounds like when the sensitivity is greater (with larger value), the effect of a parameter change to the system is less. I thought it should be opposite, right? Pls advise.
 

Re: Sensitivity of control sys to parameter variations - hel

No, the statement in the material is correct. High sensitivity means large changes. But these changes are undesirable, so the greater the sensitivity, the more undesirabile, or less desirable, the effect.
 

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