Mechanical Vibration Experiment

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Vibration Experiment
Preface
The mechanical vibration (Mechanical Vibration) is Oscillations (Periodic Motion) or random (Random Motion) of the mass of the mechanical system versus a balanced static system, the mechanical vibrations caused by mechanical systems (Structure or equipment), which is in a state of static equilibrium is disturbed by an external force. Resulting in the exchange of kinetic energy and potential energy between the mass and spring of the system. An example of interference in the mechanical vibration, which are wind (done with the plane, building bridges), ocean waves (done with the ship in the sea), and ground motion because of the earthquake (action and building structures). The general two kinds of vibration are free
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The motion in the fastening reason for the unit might be supervised with vibration pickup and examined to determine the spectrum. These details may then be employed to set the shaker drive signal to proper spectrum shape and level. The best approach would be to arrange the machine to watch and control the amount instantly. The three functional limitations to the performance of electrodynamic shaker are displacement, velocity and acceleration. Shaker is operated by displacement at the lowest frequency. On the other hand, acceleration limit the performance of shaker at highest frequency. For velocity limit performance of shaker in a band between the other two. For example, Thermotron?s DS- 2250 vibration system has a displacement limit of 2? peak-peak, a velocity limit of 100 inches per second, and an acceleration limit of 100 g?s. Each of those limits applies over a different frequency range …show more content…
The principle of physical governing the measurement system is the Doppler Effect that occurs when the laser beam is reflected from a small area of the testing object that vibrate. The figure below gives the pictorial representation of the Doppler Effect. The loudspeaker represents a sound source and it is assumed that the observer is standing on the right of the speaker. The lines originating from the speaker represents the vibration maxima at a specific observation time

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