Sinusoidal Mode

Generally in physics, one calls sinusoidal mode (or harmonic mode ) the state of a system for which the variation in the Temps of the sizes characterizing it is Sinusoïdal E.

This mode perhaps reached by the system because of an external excitation (Mechanical force , Generating electric alternate, Thermal phenomenon ): it is the forced sinusoidal mode, or, in certain situations during the free evolution of the system.

The sinusoidal mode draws its theoretical importance from the theorem of Fourier: this one states that any periodic signal is decomposable in a series of sinusoidal functions. Thus, the study of any system subjected to an excitation external periodic perhaps studied thanks to knowledge of the sinusoidal mode: it is the harmonic Analyze.

In the field of the electricity the sinusoidal sizes are for example the intensity of the electric current, the potential difference or the load at the boundaries of a condenser. In mechanics the sizes will be for example the position or speed. In the Acoustic field overpressure and displacement will be the sinusoidal sizes.

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