Q.3 A counter-rotating eccentric mass exciter consisting of two rotating 400 g masses describing circles of 150 mm radius at the same speed, but in opposite senses, is placed on a machine element to induce a steady-state vibration. During a free vibration test, the assembly is displaced and released, the period of vibration is t s, and the ratio of consecutive amplitudes is r to 1.0. The spring stiffness is k = 550 N/m. When the speed of the exciter is 1200 rpm, determine: a) the amplitude of vibration b) the transmitted force to the ground
Simple harmonic motion
Simple harmonic motion is a type of periodic motion in which an object undergoes oscillatory motion. The restoring force exerted by the object exhibiting SHM is proportional to the displacement from the equilibrium position. The force is directed towards the mean position. We see many examples of SHM around us, common ones are the motion of a pendulum, spring and vibration of strings in musical instruments, and so on.
Simple Pendulum
A simple pendulum comprises a heavy mass (called bob) attached to one end of the weightless and flexible string.
Oscillation
In Physics, oscillation means a repetitive motion that happens in a variation with respect to time. There is usually a central value, where the object would be at rest. Additionally, there are two or more positions between which the repetitive motion takes place. In mathematics, oscillations can also be described as vibrations. The most common examples of oscillation that is seen in daily lives include the alternating current (AC) or the motion of a moving pendulum.
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