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The block diagram (attached) shows the control of an electric heating

system. The heater is driven from a voltage-controlled power supply, the

voltage V1 being derived from a potientiometer. The output temperature,

θO, is subject to disturbances, θD, because of changes in the ambient

temperature. It is proposed to apply 'disturbance feedback control' to the

system by the inclusion of a transducer that measures the external

temperature and feeds a signal back to the input via a proportional

controller of gain H.

Determine the required value of H to eliminate the effect of the disturbance

Don't really know where to start with this, would be gratefull for any help. Thanks!

system. The heater is driven from a voltage-controlled power supply, the

voltage V1 being derived from a potientiometer. The output temperature,

θO, is subject to disturbances, θD, because of changes in the ambient

temperature. It is proposed to apply 'disturbance feedback control' to the

system by the inclusion of a transducer that measures the external

temperature and feeds a signal back to the input via a proportional

controller of gain H.

Determine the required value of H to eliminate the effect of the disturbance

Don't really know where to start with this, would be gratefull for any help. Thanks!