Harmonic Analyzer

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harmonic analyzer

[här′man·ik ′an·ə‚liz·ər]
An instrument that measures the strength of each harmonic in a complex wave. Also known as harmonic wave analyzer.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Harmonic Analyzer


a computational device for finding the harmonic amplitudes of complicated periodic functions. These analyzers are used in dynamic investigations of crank-and-connecting-rod mechanisms in engines, preliminary estimates of the effects caused by external periodic disturbances on oscillatory systems, analysis of acoustic vibrations, and the solution of similar problems. Practically all types of harmonic analyzers consist of an input device, multipliers, and integrators. The basic characteristics of harmonic analyzers (by which they are classified) are the type of function assigned (graph, electrical signal, or mechanical transposition), the highest harmonic number, and the number of coefficients computed simultaneously. The most common types are mechanical, which can simultaneously provide the amplitudes of 20 to 25 harmonics for a given function by manually following its curve.


Vasmanov, V. V. Vychislitel’nye matematicheskie pribory. Moscow, 1958.
Meier zur Kapellen, V. Instrumental’naia matematika dlia inzhenerov. Moscow, 1959. (Translated from German.)
The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
The book, Albert Michelson's Harmonic Analyzer: A Visual Tour of a Nineteenth Century Machine That Performs Fourier Analysis, is available as a free PDF download at www.engineerguy.com/fourier.
The Harmonic Analyzer adds cosines to create intricate patterns.
Michelson built his first prototype of a machine similar to the Harmonic Analyzer in 1897.
of Chicago manufactured two models of the Harmonic Analyzer. The company, a forerunner to Gaertner Scientific Corp., was a small manufacturer of precision scientific instruments, including others designed by Michelson.
* The control is based on using total current feedback with harmonic analyzer, which extracts values of the amplitudes and phases of the first five odd harmonics and as well as define the microcontroller based control algorithm of the system;