PROBLEM 3 (20%) Figure 2 shows a simple temperature control of a machine tool cooling system, where r is the setting temperature and y is the coolant temperature. There is a delay of D seconds present in the cooling
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(b) (10%) Estimate the maximum allowable delay for the system to maintain at least 20 dB of gain margin, by using the approximation , when |ω|<<1.
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, when |ω|<<1.