MECHENG 4Q03 Lecture Notes - Stiction, Kinematics, Potential Energy

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Assumed to be a rigid body that can undergo changes in kinetic energy. Depending on the model chosen, different parts factor into the mass. Masses often appear in combination - consolidate into a single mass. Mass can have energy: potential energy when held in gravity, kinetic energy when moving. In real systems, the vibrating energy dissipates into heat and sound. This reduction in system energy reduces the amplitude of response of a system. The mechanism by which this occurs is known as damping (coefficient is c") Viscous damping (primary focus in this course) Damping due to the resistance offered by the fluid in which the system operates. Example: fluid flow through an orifice (shock absorber) Magnitude of damping force in a real system depends on many different factors. Therefore hard to estimate damping over time. Damping due to friction between rubbing surfaces that are dry. Could consider constant in magnitude but changes with direction.

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