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  1. The reduction of energy in a mechanical or electrical system by absorption or radiation. 2. The act of reducing the amplitude of the oscillations of an oscillatory system; hindering or pre- venting oscillation or vibration; diminishing the sharpness of resonance of the natural frequency of a system.


Related Terms

MOTOR ELEMENT

[ENG ACOUS] That portion of an electroacoustic receiver which receives energy from the electric system and converts it into mechanical energy.

JUMP PHENOMENON

A phenomenon occurring in a nonlinear system subjected to a sinusoidal input at constant frequency, in which the value of the amplitude of the forced oscillation can jump upward or downward as the input amplitude is varied through either of two fixed values, and the graph of the forced amplitude versus the input amplitude follows a hysteresis loop.

HYSTERETIC DAMPING

Damping of a vibrating system in which the retarding force is proportional to the velocity and inversely proportional to the frequency of the vibration.

NORMAL-PLATE ANEMOMETER

A type of pressure-plate anemometer in which the plate, restrained by a stiff spring, is held perpendicular to the wind; the wind-activated motion of the plate is measured electrically; the natural frequency of this system can be made high enough so that resonance magnification does not occur.

LAGRANGE'S EQUATIONS

Equations of motion of a mechanical system for which a classical (non-quantum-mechanical) description is suitable, and which relate the kinetic energy of the system to the generalized coordinates, the generalized forces, and the time. Also known as Lagrangian equations of motion.

NEWTONIAN MECHANICS

The system of mechanics based upon Newton's laws of motion in which mass and energy are considered as separate, conservative, mechanical properties, in contrast to their treatment in relativistic mechanics.

MECHANICAL REFRIGERATION SYSTEM

A term describing a refrigeration system using mechanical means to transfer energy from and to a cooling medium.

BOILER HEAT BALANCE

A means of accounting for the thermal energy entering a steam-generating system in terms of its ultimate useful heat absorption or thermal loss.

RESONANT FREQUENCY

Any frequency at which a body or system vibrates most readily. The lowest resonant frequency is the natural frequency of the body or system.

FORCED OSCILLATION

An oscillation produced in a simple oscillator or equivalent mechanical system by an external periodic driving force. Also known as forced vibration.

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