ISSN:
1013-9826
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
State of the art in Coriolis mass flow metering is the single straight tube oscillating inresonance and actuated by one electromagnetic actuator. The difference in time of twoelectro-magnetic sensors measuring the velocity of the vibrating tube at the up- and downstream sideof the tube is directly proportional to mass flow. By using a lumped parameter model consisting oftwo coupled oscillating systems that represent the oscillation in the first and second eigenmode onecan derive the characteristics of the device in terms of zero and sensitivity, two important parametersin today’s mass flowmeters. In [1, 2] these parameters are calculated from measurements obtained byadditionally stimulating the device in the second eigenmode in a cyclic procedure. As onlymeasurements in steady state can be used, the procedure is time consuming and up to now notgenerally applicable. However, these shortcomings can be overcome by using a new control strategy.In this strategy the oscillation of the first and second eigenmode is assigned in terms of amplitude,frequency and phase via a so called trajectory generator and is realized by a flatness-based controlscheme derived from the lumped parameter model. In the paper we will present a method to identifythe parameters zero and sensitivity without the need for a cyclic operation of the device
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/57/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.381-382.465.pdf
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