Topic
Fundamental frequency
About: Fundamental frequency is a research topic. Over the lifetime, 8941 publications have been published within this topic receiving 131583 citations.
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TL;DR: In this paper, a series of phonetic evaluation tests which were made by means of synthetically produced vowel sounds are given for an independent and systematic manner without encountering the uncertainties and limitations of the human speech mechanism.
Abstract: The results are given for a series of phonetic evaluation tests which were made by means of synthetically produced vowel sounds. By employing synthetically produced sounds, a number of the significant parameters could be varied in an independent and systematic manner without encountering the uncertainties and limitations of the human speech mechanism. The types of parameter changes which were investigated by this means were those of fundamental frequency or pitch, formant frequency and amplitude, and, finally, the number of formants important to a sound. The results of the tests indicate that all of these parameters are important in the evaluation of the sound. In particular, there is a shift in the phonetic evaluation which can be attributed to pitch alone.
94 citations
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TL;DR: In this paper, the derivation of the frequency equation of a special combined dynamic system consisting of a clamped-free Bernoulli-Euler beam with a tip mass where a spring-mass system is attached to it is essentially carried out by means of the Lagrange multipliers method.
94 citations
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TL;DR: In this article, a diagnostic method of determining the position and size of a transverse open crack on a stationary shaft without disengaging it from the machine system is investigated. And the position of the crack can be predicted by comparing the fundamental mode shapes of the shaft with and without a crack.
93 citations
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TL;DR: The presented method for joint estimation of the fundamental frequency and order of a set of harmonically related sinusoids based on the multiple signal classification (MUSIC) estimation criterion is shown to have an efficient implementation using fast Fourier transforms.
Abstract: In this paper, we present a novel method for joint estimation of the fundamental frequency and order of a set of harmonically related sinusoids based on the multiple signal classification (MUSIC) estimation criterion. The presented method, termed HMUSIC, is shown to have an efficient implementation using fast Fourier transforms (FFTs). Furthermore, refined estimates can be obtained using a gradient-based method. Illustrative examples of the application of the algorithm to real-life speech and audio signals are given, and the statistical performance of the estimator is evaluated using synthetic signals, demonstrating its good statistical properties.
93 citations
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01 Jan 1981TL;DR: In this article, an analysis of rigorous and general nature for the determination of resonant frequencies and natural response of stators having encased construction is presented, which is based on the threedimensional theory of elasticity and it is therefore capable of providing information about not only the radial vibrations of a stator but also about the torsional and axial vibrations.
Abstract: Accurate determination of values of resonant frequencies and vibration characteristics of stators is essential for the purpose of designing quiet electrical machines. In this paper, an analysis of rigorous and general nature for the determination of resonant frequencies and natural response of stators having encased construction is presented. The analysis is based on the three-dimensional theory of elasticity and it is therefore capable of providing information about not only the radial vibrations of a stator but also about the torsional and axial vibrations. Further, the effects of teeth, windings and frame are incorporated in the analysis. The derived frequency equation is applicable to all modes of vibration including the breathing and the beam-type modes. It delivers values of the lowest as well as the higher-order resonant frequencies. The terms of the frequency equation are given in dimensionless quantities so that the equation can be used for stators of small as well as medium and large size machines. The analysis also provides information on the nature of stator vibrations at the various resonances. This information lays foundation to explain several important phenomena related to the natural response of stators. Among these are the phenomenon of multiple resonances, the phenomenon of coupling between various components of displacement and the phenomenon of dual resonances. Simplified frequency equations are also derived from the general frequency equation for the special modes of uniform vibrations along stator circumference and stator length. The experimental verification of the analysis is reported in a companion paper.
92 citations