Results 331 to 340 of about 6,931,000 (372)

Comb-calibrated frequency sweeping interferometry for absolute distance and vibration measurement.

Optics Letters, 2019
We present here an absolute distance measurement system based on frequency sweeping interferometry calibrated with a frequency comb. The instantaneous frequency of the sweeping laser is calibrated at some discrete frequencies corresponding to the comb ...
Wenhui Yu, P. Pfeiffer, Alireza Morsali, Jianming Yang, J. Fontaine   +4 more
semanticscholar   +1 more source

Vibration Measuring System

The Journal of the Acoustical Society of America, 2011
The invention relates to a vibration measuring system for the frequency-selective measuring of especially low-frequency vibrations such as they are relevant in the area of automation and motive power engineering. The aim of the invention is to provide a system which allows an economical vibration analysis of frequencies in the range of from 0 to 1 kHz.
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Cable vibration — Methods of measurement

Electrical Engineering, 1936
Test methods and equipment developed for the laboratory production in cables of vibrations (standing waves) similar to those experienced in transmission line service, and for determining the relative susceptibility of different cables to conditions tending to produce vibrations, are described.
Joseph S. Carroll, John A. Koontz
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Heterodyne vibration measurement

Measurement Techniques, 1993
Analytic expressions are derived for the vibration amplitude and frequency in a heterodyne measurement method. The measurement accuracy is estimated.
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VIBRATION MEASURING TECHNIQUES

Industrial Lubrication and Tribology, 1989
Vibration monitoring is being increasingly used as a tool for safe operation of machinery and efficient maintenance planning. There are, however, many problems associated with the measurement and interpretation of vibration data. In order to obtain a rapid diagnosis of a machine's health, and to apply condition monitoring results in practice, it is ...
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Rotating Vibration Measurement Using 3D Digital Image Correlation

Experimental mechanics, 2023
Y. Wang, Z. Gao, Z. Fang, Y. Su, Q. Zhang   +4 more
semanticscholar   +1 more source

Piezoelectric vibration measurement head

The Journal of the Acoustical Society of America, 1987
A vibration measurement head is used to measure the type of vibration set up in a magnetic head by the frictional contact of the magnetic head with magnetic media. The head is the same shape as such a magnetic head and consists of piezoelectric material in which vibration generates an electrical charge.
Takashi Iwasaki, Keiju Mori
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Ambient vibration measurements

2003
Structural analysis is usually carried out by aid of the analytical models that have, together with the computational power, considerably improved. Yet, the modeling of true structural behavior of existing buildings presents a difficult step in the analysis because of unknown building methods, various materials used, structural degradation and complex ...
Sigmund, Vladimir, Guljaš, Ivica, Brana, Petar, Zovkić, Jurko, Stanić, Andreas   +4 more
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Ground Vibration Measurement

2010
Measurement of ground vibration is important for checking of amplitudes of predicted ground motion and for confirmation of efficiency of control measures of ground vibration. The properties of measuring instruments used can affect the results of measurements and therefore the user need to know how to select these properties in order to obtain correct ...
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Vibration Measurements

Abstract This chapter focuses on the design of measuring devices. The devices used to measure vibration typically consist of an electronic transducer with an interconnecting cable and an alternating current voltmeter. The working principle of each type of transducer is described in this chapter along with their important characteristics ...
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