TAILIEUCHUNG - Electric Circuits, 9th Edition P31

Electric Circuits, 9th Edition P31. Designed for use in a one or two-semester Introductory Circuit Analysis or Circuit Theory Course taught in Electrical or Computer Engineering Departments. Electric Circuits 9/e is the most widely used introductory circuits textbook of the past 25 years. As this book has evolved over the years to meet the changing learning styles of students, importantly, the underlying teaching approaches and philosophies remain unchanged. | 276 Natural and Step Responses of RLC Circuits Therefore the response is underdamped. Now a d - a2 V10A - 4 X 104 100V96 rad s 1 - a ja i -200 rad s s2 a ja d -200 rad s. For the underdamped case we do not ordinarily solve for Sj and s2 because we do not use them explicitly. However this example emphasizes why and s2 are known as complex frequencies b Because v is the voltage across the terminals of a capacitor we have v 0 0 X 0. Because v 0 0 the current in the resistive branch is zero at t 0 . Hence the current in the capacitor at t 0 is the negative of the inductor current zc 0 - mA. Therefore the initial value of the derivative is dv 0 1 T3 dt 10-6 c From Eqs. and 0 and 98 000 B2 ------ 100 V. Substituting the numerical values of a Bj. and B2 into the expression for y i gives y Z lOOe 200 sin V. t 0. d Figure shows the plot of r versus t for the first 11 ms after the stored energy is released. It clearly indicates the damped oscillatory nature of the underdamped response. The voltage v t approaches its final value alternating between values that are greater than and less than the final value. Furthermore these swings about the final value decrease exponentially with time. y V Figure The voltage response for Example . Characteristics of the Underdamped Response The underdamped response has several important characteristics. First as the dissipative losses in the circuit decrease the persistence of the oscillations increases and the frequency of the oscillations approaches to0. In other words as R oo the dissipation in the circuit in Fig. approaches zero because p v2 R. As 7 oo 0 which tells us that d oi . When a 0 the maximum amplitude of the voltage remains constant thus the oscillation at w is sustained. In Example if R were increased to infinity the solution for v f would become v r 98sinI000rV t 0. Thus in this case the oscillation is sustained the maximum amplitude of the .

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