Journal ArticleDOI
A radically new dynamic response capability for Coriolis flow meters
TLDR
In this article, the Coriolis dynamic response of flow meters is investigated theoretically and experimentally, by finite element simulation (complex flow tube shapes) and by experimentally using a simple straight tube.Abstract:
The dynamic response of flow meters is significant in many applications, including fast control operations, e.g. short duration (less than 1 s) batch filling and for tracking the periodic flow fluctuations produced by positive displacement devices. The factors which determine Coriolis dynamic response have been elucidated. It has been shown that the meter flow tube response time cannot be less than the duration of one drive cycle of the tube vibration (i.e. reciprocal of drive frequency). This gives the potential of a response time of order 1 ms for the fastest currently available meters. However, the delay-time and update rates from the user output depend upon flow transmitter technology and design. Flow tube dynamic response has been investigated theoretically (simple straight tube), by finite element simulation (complex flow tube shapes) and experimentally. Commercially available meters were tested to determine the flow tube dynamic response to step changes in flow rate and the response to low frequency (compared with meter drive frequency) flow pulsations. Generally, dynamic flow events have been found to introduce contaminating signal components at one or more frequencies, other than that of the meter drive. The paper also presents details of the signal processing used to extract the required phase-difference and a method for reducing the contaminating signal noise. A new fast-response meter is currently being developed and some of the significant advances in the technology of a novel digital transmitter are described.read more
Citations
More filters
Journal ArticleDOI
Coriolis mass flowmeters: Overview of the current state of the art and latest research
TL;DR: The published information of the last decade is reviewed and the conclusions of the different papers are briefly described.
Journal ArticleDOI
Effect of asymmetric actuator and detector position on Coriolis flowmeter and measured phase shift
Stephanie Enz,Stephanie Enz +1 more
TL;DR: In this paper, a simple model of an imperfectly excited, simply supported, straight, single pipe Coriolis flowmeters is investigated using a multiple time scaling perturbation analysis, which offers a direct insight into how the location of the actuator influences the phase shift.
Journal ArticleDOI
The dynamic performance of a new ultra-fast response Coriolis flow meter
TL;DR: Clark et al. as mentioned in this paper identified the requirements for both a Coriolis flow-tube and the associated flow-transmitter, to achieve an ultra-fast dynamic response, and a new meter was assembled using a commercially available straight flow tube, selected for its high drive (fundamental resonant) frequency of about 750 Hz (water-filled) and this was interfaced with a newly extended version of Oxford's digital transmitter technology.
Journal ArticleDOI
Modeling of Coriolis mass flow meter of a general plane-shape pipe
Guirguis Samer,ShangChun Fan +1 more
TL;DR: In this paper, the vibration of a general plane tube with a flowing fluid, which is the measuring element in a Coriolis mass flow meter (CMF), is studied.
Journal ArticleDOI
Prediction of the Dynamic Performance of Fast Response Coriolis Meter Systems
TL;DR: It is shown how finite element modeling can be used to give predictions of the response of Coriolis meters.
References
More filters
Book
Advanced Calculus for Applications
TL;DR: In this paper, the Laplace Transform is used to solve the problem of linear differential equations with constant coefficients, which is a special case of the problem we are dealing with here, and the results are shown to be valid for large values of x.
Journal ArticleDOI
The self-validating sensor: rationale, definitions and examples
Manus Henry,David Clarke +1 more
TL;DR: In this article, a self-validating sensor model is proposed which performs self-diagnostics and generates a variety of data types, including the on-line uncertainty of each measurement.
Journal ArticleDOI
A self-validating digital Coriolis mass-flow meter: an overview
TL;DR: In this article, a new implementation of a Coriolis mass-flow meter transmitter is described, based on digital components, and has improved performance compared with the commercial, mostly analogue, transmitter using the same flow tube (transducer).
Journal ArticleDOI
Response of a Coriolis mass flow meter to step changes in flow rate
TL;DR: In this article, the Coriolis mass flowmeter is used to track step changes in flow rate and the effect of a correction technique to reduce noise is demonstrated, even though it is responsible for only 6 ms of the overall delay.
The dynamic response of Coriolis mass flow meters: Theory and applications
Abstract: The speed of response of commercial Coriolis meters to a step change in mass flow rate corresponds to a time constant which may range from 0.1 s to several seconds. This response is a result both of the dynamic response of the physical components of the meter and of the electronics and the computational algorithms used to convert that dynamic response into an estimate of the mass flow rate. A comprehensive investigation of the dynamic response is presented with a view to establishing the ultimate limits of the overall meter response. Attention is initially concentrated on a simple straight tube meter and analytical solutions are presented for the response to a step change in flow rate both for an undamped meter and for a meter with internal damping. These results are compared with results from a finite element model of the same meter and then the finite element modelling is extended to geometries typical of commercial meters. Finally, representative results are presented from an experimental study of the response of commercial meters to step changes in flow rate. A study of the essential components of the algorithm used in a meter leads to the conclusion that the time constant cannot be less than the period of one cycle of the meter drive. The analytical, finite element and experimental results all combine to show that the meters all respond in the period of one drive cycle but that the flow step induces fluctuations in the meter output which decay under the influence of the flow tube damping. It is the additional damping introduced in the signal processing to overcome these fluctuations which is responsible for the large observed time constants. Possible alternative approaches are discussed.
Related Papers (5)
Experimental determination of the dynamic response of Coriolis mass flow meters
C. Clark,R. Cheesewright +1 more