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Utilization systematic measuring techniques in industries
ŘEZNÍČEK, Marek
The thesis deals with the problems of measurement in mechanical engineering. It covers the demands in the field, the implementation of selected measurements, machine calibration and factory output quality control in general. The aim of this thesis is to introduce the practical use of measurement techniques and measuring equipment used in mechanical engineering. Presented is the description of the selected measuring instruments and tools used in schools and in practice, eventually their use in the technical courses at universities and engineering schools.
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Kalibrace clonkové tratě rotačním průtokoměrem a rezonance systému
Randa, Zdeněk ; Tesař, Václav ; Hrubý, Jan
Rotary piston flowmeters (RPF) are widely used for accurate measurement of gas flow rates. We used it to calibrate a Koennecke-type quadrant nozzle flowmeter. The evaluated discharge coefficient exhibited strange local maxima, even exceeding unity. The phenomenon was sensitive to the length of the tubes connecting the RPF with the calibrated quadrant nozzle. One possible explanation, discussed in the present paper, is the local maxima to be due to acoustic resonance in the system, excited by periodic character of the flow through the RPF. Another possibility is that the also the inertia of the pistons plays a role, the air providing the spring action.
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