scholarly journals Dynamic Model of MR Dampers Based on a Hysteretic Magnetic Circuit

2018 ◽  
Vol 2018 ◽  
pp. 1-13 ◽  
Author(s):  
Pengfei Guo ◽  
Jing Xie ◽  
Xinchun Guan
Keyword(s):  
High Frequency ◽  
Eddy Currents ◽  
Magnetic Circuit ◽  
Fluid Model ◽  
Magnetic Hysteresis ◽  
Low Frequency ◽  
Circuit Model ◽  
Magnetic Saturation ◽  
Damping Force ◽  
Mr Dampers

As a key to understand dynamic performances of MR dampers, a comprehensive dynamic magnetic circuit model is proposed in this work on the basis of Ampere’s and Gauss’s laws. It takes into account not only the magnetic saturation, which many existing studies have focused on, but also the magnetic hysteresis and eddy currents in a MR damper. The hysteresis of steel parts of MR dampers is described by Jiles-Atherton (J-A) models, and the eddy current is included based on the field separation. Compared with the FEM results, the proposed model is validated in low- and high-frequency studies for the predictions of the magnetic saturation, the hysteresis, and the effect of eddy currents. A simple multiphysics model is developed to demonstrate how to combine the proposed magnetic circuit model with the commonly used Bingham fluid model. The damping force in the high-frequency case obviously lags behind the coil current, which exhibits a hysteresis loop in the current-force plane. The lag of damping force even exists in a low-frequency varying magnetic field and becomes more severe in the presence of eddy currents.

A comprehensive optimal design method for magnetorheological dampers utilized in DMU power package

2021 ◽  
pp. 146442072110496
Author(s):  
Fanghui Xu ◽  
Dawei Dong ◽  
Yan Huang ◽  
Rui Zhang ◽  
Shizhe Song ◽  
...  
Keyword(s):  
Optimal Design ◽  
High Frequency ◽  
High Speed ◽  
Low Frequency ◽  
Mr Damper ◽  
Magnetic Flux Density ◽  
Objective Functions ◽  
Damping Force ◽  
Optimal Method ◽  
Mr Dampers

The diesel multiple unit (DMU) has been widely used in high-speed railway service due to its flexibility and economy. Considering the broadband and complex vibration generated by DMU power package, the advanced semi-active suspension with magnetorheological (MR) dampers is introduced to promote anti-vibration performance. In this work, a comprehensive optimal design approach for MR damper used in DMU power package is proposed. Quasi-static modeling process is conducted to obtain MR damper's low-frequency outputs, while its high-frequency damping forces are calculated by physical modeling considering the fluid compressibility and piston assembly inertia. Then the objective functions and optimization variables are determined. Based on response surface and linear correlation analysis, the influence of the optimal variables on the objective functions is discussed. Using reference-point based nondominated sorting approach (NSGA-III), the evolutionary many-objective optimization is conducted. In addition, magnetic design is incorporated into the optimal process to ensure the magnetic flux density in the effective working area. Finally, an optimized MR damper prototype is manufactured and tested. By comparing the experimental damping force with calculated results in both low-frequency and high-frequency ranges, the effectiveness of the presented optimal method for MR dampers is validated.

scholarly journals EVALUATION OF STRESS IN STEEL STRUCTURES USING ELECTROMAGNETIC METHODS BASED ON UTILIZATION OF MICROSTRIP ANTENNA SENSOR AND MONITORING OF AC MAGNETIZATION PROCESS

2016 ◽  
Vol 6 (4) ◽  
pp. 32-36 ◽  
Author(s):  
Przemysław Łopato ◽  
Grzegorz Psuj ◽  
Michał Herbko ◽  
Michał Maciusowicz
Keyword(s):  
Plastic Deformation ◽  
High Frequency ◽  
Magnetic Hysteresis ◽  
Low Frequency ◽  
Steel Structures ◽  
Magnetic Hysteresis Loop ◽  
Magnetization Process ◽  
Frequency Range ◽  
Frequency Method ◽  
Electromagnetic Methods

In this paper the results of utilization of electromagnetic methods operating in low and high frequency range for evaluation of stress state and plastic deformation in steel elements are presented. In low frequency range Barkhausen noise and magnetic hysteresis loop method for evaluation of stress level and growth of plastic deformation changes were utilized. The methods allow to monitor parameters related to magnetization process under AC filed. Additionally in this paper the possibility of utilization of high frequency method for estimation of deformation extent (i.e. elongation) caused by stress will be presented. In this experiment the frequency response (the reflection coefficient S11) is measured. The strong relation of antennas resonant frequency to patch dimensions is utilized in order to obtain information about deformation of the sample.

Magnetic Circuit Model Considering Magnetic Hysteresis

2014 ◽  
Vol 134 (4) ◽  
pp. 243-249 ◽  
Author(s):  
Hideaki Tanaka ◽  
Kenji Nakamura ◽  
Osamu Ichinokura
Keyword(s):  
Magnetic Circuit ◽  
Magnetic Hysteresis ◽  
Circuit Model

Physical modeling and experimental verification of magneto-rheological damper under medium and high frequency excitation

2020 ◽  
pp. 146442072096600
Author(s):  
Fanghui Xu ◽  
Dawei Dong ◽  
Yan Huang ◽  
Shizhe Song ◽  
Bing Yan
Keyword(s):  
Physical Model ◽  
High Frequency ◽  
Vibration Isolation ◽  
Dynamic Performance ◽  
Low Frequency ◽  
Damping Force ◽  
Active Device ◽  
Low Frequency Vibration ◽  
Output Characteristics ◽  
Magneto Rheological

As a promising semi-active device, magneto-rheological damper has been widely used in low-frequency vibration isolation fields (within 20 Hz) such as bridge damping and building seismic resistance. Recently, the application of magneto-rheological damper has extended to medium and high frequency fields such as satellite and power engine vibration control, accompanied with an urgent need of detailed understanding of its output characteristics. In this paper, a comprehensive physical model is established to analyze dynamic performance of the magneto-rheological damper. The model, derived from both Poiseuille and Couette flow, aims to describe the relationship between the flow rate and pressure difference. The compressibility of the magneto-rheological fluid, the inertia of both the fluid and piston assembly, and the friction are involved to capture the medium and high frequency dynamics of the damping force. Theoretical calculation and simulation verification of magnetic circuit are conducted. Then the experiment based on a self-made prototype is carried out. The results show that the damping force calculated by proposed physical model matches well with the experimental results across the predefined range of frequency and coil current levels.

Mathematical Modeling, Analysis, and Design of Magnetorheological (MR) Dampers

2009 ◽  
Vol 131 (6) ◽  
Author(s):  
Weng Wai Chooi ◽  
S. Olutunde Oyadiji
Keyword(s):  
Model Simulation ◽  
Fluid Model ◽  
Forced Flow ◽  
Physical Parameters ◽  
Parallel Plates ◽  
Damping Force ◽  
Mr Fluid ◽  
Analysis And Design ◽  
Mr Dampers ◽  
Annular Gap

Most magnetorheological (MR) fluid dampers are designed as fixed-pole valve mode devices, where the MR fluid is forced to flow through a magnetically active annular gap. This forced flow generates the damping force, which can be continuously regulated by controlling the strength of the applied magnetic field. Because the size of the annular gap is usually very small relative to the radii of the annulus, the flow of the MR fluid through this annulus is usually approximated by the flow of fluid through two infinitely wide parallel plates. This approximation, which is widely used in designing and modeling of MR dampers, is satisfactory for many engineering purposes. However, the model does not represent accurately the physical processes and, therefore, expressions that correctly describe the physical behavior are highly desirable. In this paper, a mathematical model based on the flow of MR fluids through an annular gap is developed. Central to the model is the solution for the flow of any fluid model with a yield stress (of which MR fluid is an example) through the annular gap inside the damper. The physical parameters of a MR damper designed and fabricated at the University of Manchester are used to evaluate the performance of the damper and to compare with the corresponding predictions of the parallel plate model. Simulation results incorporating the effects of fluid compressibility are presented, and it is shown that this model can describe the major characteristics of such a device—nonlinear, asymmetric, and hysteretic behaviors—successfully.

Overview of Solutions and Design Methods for Linear Electric Generators with Permanent Magnets

2021 ◽  
Vol 64 (6) ◽  
pp. 36-51
Author(s):  
Andrey Kramarov ◽  
◽  
Aleksandr Pavlenko ◽  
Denis Batishchev ◽  
Igor Trocenko ◽  
...  
Keyword(s):  
Detailed Analysis ◽  
Main Part ◽  
Permanent Magnets ◽  
Eddy Currents ◽  
Magnetic Circuit ◽  
Magnetic Hysteresis ◽  
Electric Machines ◽  
Equivalent Circuits ◽  
Magnetic Systems ◽  
Electric Generators

An overview of methods for calculating and designing linear electric generators with permanent magnets is given. The techniques are grouped according to the type of calculation approach used. A detailed analysis of the proposed methods and assumptions is carried out, conclusions are drawn about the possibility of their use in the design of electric generators with permanent magnets with solid magnetic circuit elements. The main assumptions are related to the representation of the parameters of the equivalent circuits of magnetic systems. It was found that the main part of the methods does not take into account the influence of magnetic hysteresis and eddy currents in solid elements of the magnetic circuit. It is shown that many approaches aimed at designing electric machines with permanent magnets can be adapted to linear electric generators.

Magnetic Circuit Model Considering Magnetic Hysteresis

2015 ◽  
Vol 192 (3) ◽  
pp. 11-18 ◽  
Author(s):  
Hideaki Tanaka ◽  
Kenji Nakamura ◽  
Osamu Ichinokura
Keyword(s):  
Magnetic Circuit ◽  
Magnetic Hysteresis ◽  
Circuit Model
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