The open loop transfer function of unity feedback, underdamped 0 system is given as: G(s) = K/(s(1 + Ts)) Find the values of K and T, if the Maximum Peak Overshoot of a closed loop step response is restricted to be below 110% (Mp = 0.1) of the steady state value and the settling time (within 2% band) should not exceed 0.2 seconds. Show how these constraints can be attained with the help of location of the complex-conjugate pole-pair on s-plane and shade the region of s- plane which satisfies the constraint.
Question
The open loop transfer function of unity feedback, underdamped 0 system is given as: G(s) = K/(s(1 + Ts)) Find the values of K and T, if the Maximum Peak Overshoot of a closed loop step response is restricted to be below 110% (Mp = 0.1) of the steady state value and the settling time (within 2% band) should not exceed 0.2 seconds. Show how these constraints can be attained with the help of location of the complex-conjugate pole-pair on s-plane and shade the region of s- plane which satisfies the constraint.
Solution
To find the values of K and T that satisfy the given constraints, we need to analyze the open loop transfer function and the desired closed loop response.
The open loop transfer function is given as G(s) = K/(s(1 + Ts)), where K represents the gain and T represents the time constant.
To satisfy the constraint on the Maximum Peak Overshoot (Mp), we need to ensure that Mp is below 110% (0.1) of the steady state value. In an underdamped system, the Mp is determined by the damping ratio (ζ) and can be calculated using the formula Mp = exp((-ζπ)/sqrt(1-ζ^2)).
To satisfy the constraint on the settling time, we need to ensure that the response settles within a 2% band in less than 0.2 seconds.
The location of the complex-conjugate pole-pair on the s-plane affects the system's response. To satisfy the constraints, we need to choose the pole-pair location carefully.
To achieve a smaller overshoot, we need to increase the damping ratio (ζ). This can be done by increasing the value of T. By increasing T, the pole-pair moves closer to the imaginary axis, resulting in a larger damping ratio and a smaller overshoot.
To achieve a faster settling time, we need to move the pole-pair closer to the origin on the s-plane. This can be done by decreasing the value of T. By decreasing T, the pole-pair moves closer to the origin, resulting in a faster settling time.
To satisfy both constraints, we need to find the values of K and T that give us the desired damping ratio and settling time. By adjusting the values of K and T, we can find the appropriate pole-pair location that satisfies the constraints.
To shade the region of the s-plane that satisfies the constraints, we need to consider the range of values for K and T that satisfy the constraints. By varying K and T within these ranges, we can determine the shaded region on the s-plane.
Please note that the specific values of K and T that satisfy the constraints cannot be determined without further information or calculations.
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