# Home > Measuring Instruments > Flow Measurement

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**Topic under **Flow Measurement

**Source:** www.mscsoftware.com

**File size:** **834 KB**

**File type:** **pdf**

**Last download on:**
Fri Apr 20, 2018 04:23:34 AM

__Short Desciption__:

A Coriolis mass ilowmeter measures mass flow directly by vibrating a fluid—conveying pipe
at resonance. Design of these meters was facilitated by solving the equations of motion via
the finite element method. A complex eigenvalue analysis (SOLIU7) was necessary due to the
presence of the Coriolis force terms in the damping matrix. Performance parameters of the
meter can be predicted from the complex eigenvectors and were found to match experimentally
determined values to within five percent
Since vibration occurs during Coriolis meter operation, low stress designs must be used to
preclude fatigue failure. This analysis was also performed using MSC/NASTRAN

__Summary__:

MSC/NASTRAN is used extensively in the design and analysis of Coriolis mass iiowmeters. The
early portion of the design cycle focuses on the prediction of meter dynamics. MSC/NASTRAN
was used at this stage to solve (SOLlO7) the equations of motion of a custom beam finite element.
This finite element was imported into MSC/NASTRAN via DMIG entries. Additionally the linear
algebra capabilities of DMAP were used to allow the engineer to analyze an entire spectrum of A
mass fiow rates and fiuid process densities with a single finite element model.
Standard MSC/NASTRAN elements and solutions were also used at various points in the design
cycle to estimate stress. Estimation of stress is necessary to preclude fatigue failure. The ability
to predict both meter dynamics and stress in software significantly shortens the development
time for new Coriolis mass fiowmeters.

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"DESIGN AND ANALYSIS OF CORIOLIS MASS FLOWMETERS USING MSC NASTRAN"

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