The thrust of this thesis is on developing a hybrid base isolation mechanism using mr dampers as a supplemental damping. Development of hybrid electromagnetic dampers for vehicle. After giving the reader an understanding of mr technology and devices, mr damper basics are presented. Pdf design, fabrication and evaluation of mr damper semantic. Input identification, footbridge control and nonlinear. In this thesis an mr damper in a collocated control setting is used to reduce the vibrational. Therefore, they are commonly used in vibration damping, clutches, actuators and haptic devices. Developing new analytical and numerical models for mr fluid dampers and their application to seismic design of buildings kambiz esteki a ph. Development of hybrid electromagnetic dampers for vehicle suspension systems by babak ebrahimi a thesis presented to the university of waterloo in fulfillment of the thesis requirement for the degree of doctor of philosophy in mechanical engineering waterloo, ontario, canada, 2009 babak ebrahimi 2009. Master thesis mas500 mr damper hysteresis characterization. The implementation of these techniques in the investigation of mr damper control of a vehicle suspension system that makes minimal use of sensors, thereby reducing the implementation cost and increasing system reliability. The passive shock strut is then integrated with a mr valve to.
Additional practical considerations for mr damper design, such as damper piston. However, the challenge in using mr dampers is that they exhibit highly nonlinear attributes such as hysteresis, saturation, etc. The nonlinear relationship between the input and the output of mr damper should be characterized accurately in order to produce a required control action supplied by mr damper. Road input excitations u 1 and u 2 was modeled as a bump with height 0. Pdf magnetorheological mr damper is an important system which produces the control force. Yunbyeong, seismic hazard mitigation of building structures using magnetorheological dampers 2011. Based on theoretical analysis and experiments, this article proposes a new model for a magnetorheological mr damper. In this paper, the efficacy of magnetorheological mr dampers for seismic response reduction is examined.
I declare that a linguistic survey of adoptives in venda is my own work. As an example, mr fluids could enhance the performance of aircraft landing. The novel contributions of this thesis can be listed as follows. Master thesis 25mai 2011 1 mr damper hysteresis characterization for semi active suspension dariush ghorbany university of agder, 2011 faculty of engineering and science department of engineering master thesis mas500 mr damper hysteresis characterization for the semiactive. Robust automotive suspension control toward global chassis control. Karunaratne, nivithigala polgaswatte kasun viraj 2016 use of semiactive dampers in seismic mitigation of building structures. This thesis focuses on modeling of a mr damper for landing gear system and analysis of semiactive controller to attenuate dynamic load and landing impact. Finally, two hybrid dampers that were based on a modified adjustable hydraulic damper are presented. Nonparametric model of magnetorheological mr damper.
The thrust of this thesis is on developing a hybrid base isolation mechanism using mr dampers as a. In this respect, the work appears threefold since the first and third part regard identification of a realistic model for the damping device and semiactive control of the magnetorheological damper. Mr dampers provide hysteretic damping and can operate with battery power. The schematic of the piston head with the bearings installed is shown in fig. This thesis is submitted in partial fulfilment of the ph. The parameters in the model have definite physical meanings. Passive damping of cables with mr dampers springerlink.
Observations of mr fluid clumping behaviour in a squeeze. Dynamic modeling of magnetorheological damper behaviors. The existing models, namely the phenomenological models for simulating the behavior of mr. Use of semiactive dampers in seismic mitigation of building structures nivithigala polgaswaththe kasun viraj karunaratne a thesis submitted in fulfilment of the requirements for the degree of doctor of philosophy school of civil engineering and built environment science and engineering faculty queensland university of technology 2016. Practical application issues for the structural engineer by amy hwang b.
Phd dissertation, silesian university of technology. A generalized model is proposed to characterize the biviscous hysteretic force characteristics of a magnetorheological mr fluid damper using symmetric and asymmetric sigmoid functions on the basis of a fundamental force generation mechanism, observed qualitative trends and measured data under a wide range of control and excitation conditions. A simple and effective model of mr damper remains a. Furthermore, the measurements demonstrate that external dampers lead to an increase of the structural resonance frequencies since mr dampers producing large forces at high current levels represent additional, fairly stiff supports. Magnetorheological mr fluid is one such active material that can offer a range of damping properties instead of one fixed damping value, as is common with passive dampers. The challenges of the conventional parametric model are the timeconsuming and the requirement of complex parameter identification for mr damper. William hanna was awarded a smith barney in paris, tokyo, and beirut, lebanon. Chapter 4 mr damper design in this chapter, details of mr damper geometry and magnetic circuit design are provided.
This unique characteristic can be utilised to build semiactive dampers for a wide variety of vibration control systems, including structural, automotive, and aeronautical applications. Specifically, two different mr damper designs are discussed along with livefire test results for the first damper. Thesis the department of building, civil, and environmental engineering. I hereby declare that the work in this thesis is my own except for quotations and summaries which have been duly acknowledged.
Semiactive control devices have received significant attention in. If the control target is maximum damping of several modes, the damper current hardly depends on the control target. This thesis is not presented in the classical format of a phd thesis. A mudau of mashau, one of my informants, who helped me during my research. Pdf effect of magneto rheological mr damper on structures. Optimization of vehicle suspension parameters with use of. Magnetorheological dampers for seismic mitigation of. Seismic hazard mitigation of building structures using magnetorheological dampers yunbyeong chae. Master thesis 25mai 2011 1 mr damper hysteresis characterization for semi active suspension dariush ghorbany university of agder, 2011 faculty of engineering and science department of engineering master thesis mas500 mr damper hysteresis characterization for the semiactive suspension system. Financial support from national science foundation nsf and pennsylvania. The objective of this papert was to study the application of an mr damper to vibration control, design the vibration damper using mr fluids, test and evaluate its.
Magnetorheological mr damper is a typical nonlinear actuator. The thesis aims to investigate the dynamical criticality of a pedestrian footbridge and the use of a semiactive tuned mass damper. The research presented in this phd thesis was carried out between 2011 and. Pdf design, fabrication and evaluation of mr damper. In the first part of thesis, mr damper modeling and its related subject are studied, while in the second part of the thesis, application of mr dampers in tuned mass damper and bracing system is investigated. Mr dampers seminar report, pdfppt download abstract. Due to the complex nonlinearity of magnetorheological mr behavior, the modeling of mr dampers is a challenge. Pdf magnetorheological mr dampers are adaptive devices whose properties can be. Mr damper reaches its operating temperature in a short period of time, and thus it should be modelled, and the obtained. However, the nonlinear behaviour of smart fluid dampers makes the objective of. An experimental study of mr dampers for seismic protection. Pdf modeling and control of magnetorheological dampers for. Hanna is active in a number of industry and civic organizations which includes operation hope, the 2007 ellis island medal of honor, recognizing his business success and extensive community service.
Mr dampers contain a controllable mr fluid whose rheological properties vary rapidly with the applied magnetic field. This paper presents the design, fabrication and evaluation of magnetorheological damper. A magnetorheological mr damper consists of a hydraulic cylinder containing a solution that, in the presence of a magnetic field, can reversibly change from a free flowing, linear viscous fluid to a semisolid with controllable yield strength. According to the nonlinear of mr damper and the vibration characteristic of semiactive suspension of highspeed. Control devices are therefore playing a useful role to provide safety to building structures subject to seismic events. The proposed model with a smooth and concise form can interpret the biviscous and hysteretic behaviors of the mr damper very well. A 2008, the behaviour of magnetorheological fluids in squeeze mode, ph. Use of semiactive dampers in seismic mitigation of building structures iii abstract building structures generally contain inherent low damping capability and hence are vulnerable to seismic excitations. Mr dampers have turned out to be a promising device in vibration control. Modelling and control of magnetorheological dampers for vehicle suspension systems a thesis submitted to the university of manchester for the degree of doctor of philosophy in the faculty of engineering and physical sciences 2010 hassan ahmed metered school of mechanical, aerospace and civil engineering. This unique characteristic can be utilised to build semiactive dampers for a wide variety of vibration control systems, including structural, automotive, and bridge applications. Mr fluids have a dynamic yield stress over electrorheological fluids er and a broader operational temperature range.
An investigation of the effectiveness of skyhook suspensions for controlling roll dynamics of sport utility vehicles using magnetorheological dampers. A novel model of magnetorheological damper with hysteresis. Magnetorheological mr fluids enable the rapid and continuous alteration of flow resistance via the application of a magnetic field. To investigate the performance of the mr damper, a series of experiments was conducted in which the mr damper is used in conjunction with a recently developed clippedoptimal control strategy to control a threestory test structure subjected to a onedimensional. Use of semiactive dampers in seismic mitigation of.
Student number 5458447 i declare that strategies in the modernisation of venda is my own work and that all the sources that i have used or quoted have been indicated and acknowledged by means of complete references. Mr damper hysteresis characterization for semi active suspension. This thesis first introduces mr technology through a discussion of mr fluid and then by giving a broad overview of mr devices that are being developed. Optimization of vehicle suspension parameters mathematical solution of motion equations and optimization process of suspension parameters k 1, k 2, c 1 and c 2 were performed with matlabsimulink. Observer based control of an magnetorheological damper. Realtime implementation and experimental verifi cation phd thesis subrata bhowmik dcamm special repport no. However, the nonlinear behaviour of smart fluid dampers makes the. Seismic hazard mitigation of building structures using. Magnetorheological mr dampers, a type of semiactive damper, have proven to be quite effective in seismic mitigation of building structures. A thesis submitted in fulfilment of the requirement for the award of the degree of.
A mulaudzi, who shared some views on venda language contact, and mr m. Wind turbine structural damping control for tower load. Magnetorheological mr fluids are fieldresponsive material with the ability to change its rheological behavior by having an external magnetic field. In conclusion, a high yield stress mr damper at a small gap clearance was successfully. Hanna is the founding of banks to open the bank in california. After discussing automotive mr dampers, designs for gun recoil applications are presented. In this dissertation, two specific applications using smart damping technology for. Phd thesis damping of wind turbine tower vibrations mark laier brodersen dcamm special report no. Generally, mr devices are fabricated utilizing the operational mechanism of a single working mode which is either flow, shear or. Wakker, voorzitter van het college voor promoties, in het openbaar te verdedigen op dinsdag 26 september 2000 om. This dissertation proposes simple and efficient control algorithms for seismically excited structures using mr dampers and a smart passive system based on mr dampers.
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