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Computer Aided Civil and Infrastructure Engineering

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Computational Fluid Mechanics And Heat Transfer

Magnetorheological fluid technology has gained significant development during the past decades. The application of magnetorheological fluids has grown rapidly in civil engineering, safety engineering, transportation, and life science with the development of magnetorheological fluid–based devices, especially magnetorheological fluid dampers. The magnetorheological fluid dampers could offer an outstanding capability in semiactive vibration control due to excellent dynamical features such as fast response, environmentally robust characteristics, large force capacity, low power consumption, and simple interfaces between electronic input and mechanical output. To address the fast growing demand on magnetorheological fluid damping technology in extensive engineering practices, the state-of-the-art development is presented in this article, which provides a comprehensive review on the structure design and its analysis of magnetorheological fluid dampers (or systems). This can be regarded as a useful complement to...

Magnetorheological fluid dampers: A review on structure design and analysis

Vibration energy harvesting in automotive suspension system: A detailed review

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Insight into Magnetorheological Shock Absorbers

The paper describes the structure and the results of numerical calculations and experimental tests of a newly developed vibration power generator for a linear magnetorheological (MR) damper. The generator consists of permanent magnets and coil with foil winding. The device produces electrical energy according to Faraday's law of electromagnetic induction. This energy is applied to vary the damping characteristics of the MR damper attached to the generator by the input current produced by the device. The objective of the numerical calculations was to determine the magnetic field distribution in the generator as well as the electric potential and current density in the generator's coil during the idle run and under the load applied to the MR damper control coil. The results of the calculations were used during the design and manufacturing stages of the device. The objective of the experimental tests carried out on a dynamic testing machine was to evaluate the generator's efficiency and to compare the experimental and predicted data. The experimental results demonstrate that the engineered device enables a change in the kinetic energy of the reciprocal motion of the MR damper which leads to variations in the damping characteristics. That is why the generator may be used to build up MR damper based vibration control systems which require no external power.

https://iopscience.iop.org/article/10.1088/0964-1726/19/10/105012/pdf

Vibration power generator for a linear MR damper

The present study is concerned with an energy-harvesting linear MR (EH-LMR) damper which is able to recover energy from external excitations using an electromagnetic energy extractor, and to adjust itself to excitations by varying the damping characteristics. The device has three main components: an MR part having a damper piston assembly movable in relation to the damper cylinder under an external excitation, a power generator to produce electrical power according to the relative movement between the damper piston and the cylinder assembly, and a conditioning electronics unit to interface directly with the generator and the MR damper. The EH-LMR damper integrates energy harvesting, dynamic sensor and MR damping technologies in a single device.The objective of the study is to get a better insight into the structure of EH-LMR damper components, to investigate the performance of each component and a device as a whole, and to compare results of experimental study against numerical data obtained in simulations conducted at the design stage. The research work demonstrates that the proposed EH-LMR damper provides a smart and compact solution with the potential of application to vibration isolation. The advantage of the device is its adaptability to external excitations and the fact that it does not need any extra power supply unit or sensor on account of its self-powered and self-sensing capabilities.

https://iopscience.iop.org/article/10.1088/0964-1726/23/3/035021/pdf

Energy-harvesting linear MR damper: prototyping and testing

The paper presents experimental investigation of a horizontally suspended cable with an MR damper attached transversally near the support. The algorithm proposed to MR damper control employs the concept of emulation of a viscous damper with an optimal viscous damping coefficient. The algorithm is realized using a velocity feedback with damping force tracking control is applied. Free vibration of the cable with an MR damper operating in passive and controlled modes are investigated. The obtained results indicate that an appropriately controlled MR damper ensures a nearly constant damping level in a wide range of cable vibration amplitudes.

/pdf/experimental-study-of-vibration-control-of-a-cable-with-an-24x1u85tfw.pdf

Experimental study of vibration control of a cable with an attached MR damper

This work deals with the analysis of parametric models of a MR linear damper, which suit various rheological structures of the MR fluid. The MR fluid structure and properties, damper description and parametric damper models which are connected in various ways with the actual behaviour of the MR fluid are presented. Based on computer simulations, the effectiveness of the models under predicted MR linear damper behaviour is shown. The values of the parametric models used in the simulations were determined in an identification experiment.

/pdf/analysis-of-parametric-models-of-mr-linear-damper-351mvb5b31.pdf

Bogdan Sapiński

Papers

Insight into Magnetorheological Shock Absorbers

Vibration power generator for a linear MR damper

Energy-harvesting linear MR damper: prototyping and testing

Experimental study of vibration control of a cable with an attached MR damper

Analysis of parametric models of MR linear damper