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

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

3. 3 Undamped Forced Vibration Particular Solution

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

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

6. 6 Damped Forced Vibration

7. 7

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

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