What do you mean by phase angle and epoch?

Phase angle

Phase angle is defines as the fraction of the time interval that has lapsed since the particle has crossed the mean position of rest in the positive direction. It is also equal to the angle swept by the radius vector since the vibrating particle last crossed its mean position of rest.




For a particle vibrating simple harmonically, the displacement is


Here,  or ()  is the phase angle.

Epoch

The initial phase angle when t=0 , is called the epoch. Thus α is called the epoch in the given equation of displacement.

Author: Tanmay Chakrabarty

Tanmay Chakrabarty is a former CSE student, currently working as a Senior Software Engineer with 5+ years of experience in the field of Web Application development in PHP+MySQL platform with strong skills in Javascript, JQuery, JQuery UI and CSS. He tries to write notes every week but fails due to heavy loads of duty.

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