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1 Lecture D33 : Forced Vibration Spring Force k > 0 Dashpot c > 0 Newtons Second Law Equation of motion Forcing

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2 Undamped Forced Vibration General Solution is general solution of... have already seen is any solution of (1) Try

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3 Undamped Forced Vibration Particular Solution

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4 Damped Forced Vibration General Solution is general solution of... have already seen is any solution of (1) Try or,

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5 Damped Forced Vibration is general solution of... have already seen is any solution of (1) Try or,

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6 Damped Forced Vibration

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8 Vibration Isolation How much of the applied force is transmitted to the wall? Transmissibility Transmitted force Applied Force Transmitted Force (spring + dashpot)

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9 Vibration Isolation Transmissibility For damping increases transmissi- bility !! For having a spring increases trans- missibility !!

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