Research On Electromagnetic Flowmeter

Traditional electromagnetic flow meters cannot solve the problem of fluid not being full and asymmetric,which can lead to inaccurate flow detection during the construction process of dredgers and result in decision-making errors.To address the above issues,this article designs a multi electrode electromagnetic flow meter based on the research of conventional single electrode flow meters and the problem of uneven and asymmetric flow rate in the actual working process of conventional electromagnetic flow meters.The main research content is as follows:1.This article first analyzes the relevant theories of electromagnetic flow meters,and based on the actual needs of marine electromagnetic flow meters,improves the multi electrode measurement of conventional flow meters.And based on the existing Shercliff’s weight function theory,the electromagnetic flowmeter is further divided into multiple regions.Through theoretical analysis of the specific values of the electric potential of different electrodes in each divided measurement interval,the weight function of the divided region is solved.The feasibility of studying multi electrode region weights has been demonstrated by solving the weight function problem through mathematical methods.2.Based on the theoretical analysis of the regional weight function in the previous chapter,the corresponding finite element simulation of the multi electrode electromagnetic flowmeter is carried out.Utilize the COMSOL simulation software’s built-in modeling system to conduct three-dimensional modeling of the multi electrode electromagnetic flowmeter measurement system.The weight analysis of the divided regions in the 3D model provides a reference for in-depth research on multi electrode measurement problems.After setting the flow area and velocity,when the fluid flows in the measurement pipeline,numerical simulation and analysis can be used to obtain the induced electromotive force caused by the fluid flow,as well as the value of the region weight function.These simulated values provide a simulation basis for the next step of the multi electrode flowmeter region reconstruction flow velocity algorithm problem.3.On the basis of the simulation in the previous chapter,the velocity distribution reconstruction algorithm of the measured velocity in each region is studied to verify the stability of the regional weight function and the feasibility of velocity reconstruction.After analyzing and comparing various speed reconstruction algorithms,we chose to use the improved TSVD＿As the velocity reconstruction algorithm in this issues,the TIK algorithm is optimized based on the original Singular value decomposition algorithm and Tikhonov algorithm.Finally,comparing the velocity reconstruction results,it shows that the TSVD selected in this issues＿The TIK algorithm has certain advantages.4.Finally,this article uses Altium Designer as the design platform and TMS320F28335 as the main control chip to design a small electromagnetic flow meter for laboratory use.The aim is to make a physical breakthrough in the design of a large dredger electromagnetic flowmeter measurement system in the future.The main functional modules of the hardware module design include excitation module,digital signal and processing module,humanmachine interaction upper computer communication module,etc.Finally,an electromagnetic flow meter flow detection program was written in CCS programming software using C language.The combination of software and hardware ultimately proved the feasibility of the electromagnetic flow meter design for the dredger.The research on flow detection of large dredgers has high significance and value.