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Dr. Bassuny El-Souhily Chapter I Mechanical Vibrations 1 CHAPTER I Fundamentals of vibration Vibration: It's the motion of a body or a system that is repeated after a given interval of time known as the period. Frequency: -The number of cycles of the motion per unit time (c.p.m, r.p.m, cps, Hz, rad/s). Amplitude: - The maximum displacement (velocity, acceleration or force) of the body or some parts of the system from the equilibrium position is the amplitude of the vibration of that point. - Figure 1 Phase relationships among displacement, velocity, and acceleration are shown on these time history plots.  Natural Frequency: If a body is suddenly disturbed in some manner it will vibrate at a definite frequency known as its natural frequency (ω).

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http://www.dliengineering.com/vibman/gloss_vibration1.htm
http://www.dliengineering.com/vibman/gloss_carrierfrequency1.htm
http://www.dliengineering.com/vibman/gloss_sidebands2.htm
http://www.dliengineering.com/vibman/gloss_spectrum1.htm
http://www.dliengineering.com/vibman/gloss_frequency1.htm
http://www.dliengineering.com/vibman/gloss_level1.htm
http://www.dliengineering.com/vibman/gloss_wave1.htm
http://www.dliengineering.com/vibman/gloss_am1.htm
http://www.dliengineering.com/vibman/gloss_amplitude1.htm
http://www.dliengineering.com/vibman/gloss_amplitudemodulation1.htm
http://www.dliengineering.com/vibman/gloss_signal1.htm
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