Definitions for **"Natural frequency"**

A projecting aperture at the end of a tube, pipe etc. serving as an outlet for compressed air. Reduces the demand on the compressor by generating the highest thrust and volume for the lowest possible air consumption. ( 099)

See RESONANT FREQUENCY.

Of an antenna, the lowest frequency at which the antenna resonates without the addition of any inductance or capacitance.

The frequency that an object vibrates the easiest at. An example is a piano tuning fork or an open ended hand wrench. A microwave oven vibrates water molecules at their natural frequency, 2.4GHz, to get them to vibrate and heat up. The natural frequency of automotive suspension systems has typically been between 10 and 15 Hz; however, later suspension designs have raised the frequency to 20 - 25 Hz.

The characteristic frequency of vibration for a particular spring-mass system after a force or displacement is applied and removed.

(MRI) The frequency at which an object or system oscillates when not subjected to a continuous or repeated external force. When an object is forced to oscillate at this frequency the amplitude of the oscillation will increase dramatically.

The frequency at which an object will vibrate freely when set in motion.

Lowest inherent rate of free vibration of a spring vibrating between its own ends.

The natural frequencies of a structure are the frequencies of free vibration. Free vibration is vibration that occurs in the absence of forced vibration. In a structure undergoing vibration, a mode of vibration is a characteristic pattern (shape) assumed by the structure in which the motion of every particle is simple harmonic motion with the same frequency. The fundamental mode of vibration of a structure is the mode having the lowest natural frequency.

the rate of free oscillations under no-load conditions

that frequency (expressed as "Hertz" or "cycles per second") at which a structure, or combination of structures, will oscillate if disturbed by some force (usually dynamic) and allowed to come to rest without any further outside influence. Vibratory systems have a number of natural frequencies depending on the direction of the force and the physical characteristics of the isolated equipment. The relationship of the system natural frequency to the frequency of the vibration or shock determines, in part, the amount of isolation (protection) which may be attained.

The frequency at which an underdamped second order system subject to a forcing function of sine wave of that frequency oscillates with amplitude greater than the input. For a third order system there are two natural frequency values while for a fourth order system there are three.

The frequency of free vibration of a system. The frequency at which an undamped system with a single degree of freedom will oscillate upon momentary displacement from its rest position.

The frequency of free oscillations under no-load load conditions.

The frequency at which a particular object or system vibrates when pushed by a single force or impulse, and not influenced by other external forces or by damping. If you hold a slinky by one end and let it hang down and then give it one push up from the bottom, the rate of up-and-down motion is its natural frequency.

The number of cycles that an object freely vibrates during a given unit of time.

A frequency where a system resonance exists. If excited at this frequency, the system will exhibit very large displacements (for low damping levels). If the system is undamped, then vibrations can occur at the natural frequency without any external excitation indefinitely.

An object such as a bell when struck will vibrate at its fundamental or natural frequency, which is governed by its mass and stiffness. Changes to either will change the frequency.

the frequency at which an object vibrates best

the frequency of oscillation that, once begun, will continue without a driving force if no damping forces are present

Natural Frequency is the frequency at which a body will freely vibrate. Resonance occurs when the natural frequency of a body is equal to the frequency of a periodic force applied to the body, which results in large amplitude oscillations.

The frequency at which a component or system resonates.

1. The frequency of free oscillation of a system. For a multiple-degree-of-freedom system, the natural frequencies are the frequencies of the normal modes of vibration. 2. The undamped resonance frequency of a physical system. It is expressed in cycles per unit time. The system may be mechanical, pneumatic, or electrical.