Production optimization of Coriolis mass flow meters based on virtual prototypes
The precise detection of a transferred mass or the permanent monitoring of a mass flow are a basic requirement in numerous areas of modern society and technology and usually mean high losses if inaccuracies are to be avoided. There are numerous possibilities for the measurement of a flow, but a measurement via a Coriolis mass flow meter (CMF) allows a conclusion directly on the mass. This unique method can use the Coriolis effect to determine the phase shift from the inlet to the outlet side, which is proportional to the mass transferred. Very high accuracies in the range of tenths to hundredths of a % are already achieved, which makes this method one of the most precise. There are many different variations and forms of CMF, but they all have one thing in common: a harmonic excitation of the mass-transferring measuring tubes creates the basis for the emergence of the Coriolis force. To ensure high measurement quality, a homogeneous mass distribution along the measuring tubes is essential. However, disturbing inhomogeneities can already occur during the production process due to general tolerances and manufacturing influences.
In order to optimize the accuracy and the manufacturing process of a CMF, this project deals with the development of a mass balancing system for the measuring tubes within the flowmeter. For this purpose, the influences of mass inhomogeneities along the measuring tubes of a commercially available dual-tube U-shaped CMF are considered. With the help of a calibration setup including numerous components, acceleration sensors and laser vibrometry, extensive investigations regarding operating frequencies, amplitudes and measuring accuracy can be made.
"This research project is carried out in cooperation with Heinrichs Messtechnik GmbH and is supported by the Federal Ministry for Economic Affairs and Climate Action (BMWK) under the grant number ZF4315606LF9 within the Central Innovation Program (ZIM) on the basis of a decision by the German Bundestag."