The natural frequency, or frequencies, of any physical system or object are the frequencies at which it will vibrate if physically disturbed. Resonance is the phenomenon that occurs when a physical system is periodically disturbed at the same period of one of its natural frequencies. Even small amplitude disturbances will then reinforce the energy stored in the system, causing the amplitude of the vibration to increase. This will continue until the energy loss in the physical system due to non-elastic motion (resistive loss) equals the energy supplied by the disturbing force. In extreme cases, the system will exceed its limits and self-destruct before equilibrium occurs. The above is true of any physical system a: Tuning forks disturb the air around the fork, and the air transmits the periodicity of the tuning fork motion to ones ear. In reverse, striking the piano key causes the piano sounding board to vibrate and disturb the surrounding air which reaches the tuning fork and, if the frequency is the same as the natural frequency of the tuning fork, it will start to vibrate in your hand. As for electromagnetic systems, they are just different physical systems, their energy being stored in the electric and magnetic fields, and their natural frequencies being determined by their physical construction and the relations between that construction and the rates at which their energies may be built up or dissipated.
Posted on: Fri, 23 Jan 2015 08:02:54 +0000
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