Non-linear Control of the Oscillation Amplitude of a Coriolis Mass-Flow meter

摘要

In a Coriolis mass-flow meter (CMFM) the process fluid (of potentially variable density) flows through a pipe undergoing yawing vibration to generate the required transverse Coriolis acceleration. Reliable control of the amplitude of vibration is necessary for this and other applications employing a deliberately oscillating mass-spring-damper where the mass and damping are subject to variation. The method pro- posed uses positive feedback of the output velocity to cancel the internal damping, with a gain determ- ined by an outer sampled-data amplitude-control loop.