# Vibration Problem (Plot Curve for Amplitude of Vibration; Determine Amplitude of Vibration for Given Motor Speed)

A schematic of a horizontal shaker is shown in figure 1 {see attachment}. The shaker consists of a mass supported on four thin, rectangular springs. The springs are L=200mm long, w=50mm wide and t=4mm thick. The Young's modulus for the springs is 200 GPa. The mass is coupled to the ground via a damper with damping factor C=894Ns/m.

The shaker is driven by a motor with an eccentric mass, mo=50g at an eccentricity of e=150mm. The total mass of the shaker, including motor, is 10kg.

1) Plot the curve for the amplitude of vibration, x to the frequency ration, r for 0<=r<=3.

2) Determine the amplitude of vibration for a motor speed of 1440 rev per min.

(Please see attachment.)

© BrainMass Inc. brainmass.com October 9, 2019, 4:34 pm ad1c9bdddfhttps://brainmass.com/engineering/mechanical-engineering/plot-curve-amplitude-vibration-determine-amplitude-36070

#### Solution Preview

Please see attachment.

Solution:

Step 1: Finding the elastic constant of the system

If a force (F) pushes horizontally, every spring will be submitted to a quarter of this force, that means (F/4).

The deviation due to this force is like that produced on a beam fixed at an end and submitted to bending by a force acting at the other end, like in figure of below:

From Strength of Materials, we know that the deflection () is given by formula:

( 1)

where I = the moment of inertia of the cross section of beam around the axis of bending

E = Young's modulus

For a rectangular section of a beam defined as in above figure, the moment of inertia is given by formula

( 2)

The elastic constant of the system is defined by the relation

( 3)

Step 2: Solving the differential equation of vibration

The ...

#### Solution Summary

The solution is provided in an attachment, done step-by-step equationally with short explanations and diagrams.