Download or read book Design Simulation and Fabrication of a Lightweight Magneto Rheological Damper written by Soroush Sefidkar-Dezfouli and published by . This book was released on 2014 with total page 125 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mountain biking has significantly evolved recently, thanks to utilizing cutting-edge technologies in mountain bicycle design and fabrication. In this research we study development of a semi-active suspension system using magneto-rheological (MR) fluid dampers instead of conventional oil based shocks. MR dampers are devices with magnetic field dependent damping characteristics.Low power consumption, high controllability, quick response, and high durability are among the major features of MR dampers. In this work we first investigate the damping characteristics of MR dampers to find out if characteristics comparable to the conventional shocks used in mountain bikes can be achieved. To this end,experimental tests were performed on an off-the-shelf MR damper. The results indicate that damping characteristics similar to the ones used in mountain bikes can in fact be achieved using MR technology.However, requirements such as small weight and wide dynamic range have to be addressed in designing a MR damper for mountain bikes. These considerations are studied in this thesis by formulating a simple design followed by a constrained optimization problem and designing the damper accordingly. Utilizing Finite element modeling and simulation tools are further utilized to fine tune and optimize the design.A prototype MR damper is fabricated after the above design steps are carried out.
Download or read book Hybrid Magnetorheological Damper written by Izyan Iryani Mohd Yazid and published by LAP Lambert Academic Publishing. This book was released on 2013 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt: A brief description about designing of Magnetorheological (MR) damper are described. MR dampers are semi-active suspension devices that use MR fluids to produce a controllable damper. The mechanical properties of the suspension can be controlled by adjusting the yield stress of the MR fluid. In this book, the design development for a new mixed mode MR damper with combination of shear and squeeze working modes was carried out. The magnetic field generated by electromagnetic coils in MR damper was analyzed using finite element method. The MR damper was designed and fabricated based on the simulation results. Combination of process parameters of working modes condition and applied current under quasi-static loadings were used in the experiments. Results, the unique damping characteristics of mixed mode MR damper was found where in general, a higher damping force has obtained in mixed mode than single mode. Eventually, the design of MR damper will provide an opportunity to study and consequently understand on how the MR fluids react to such operating condition in order to be realized in the MR damper.
Download or read book Innovative Design of Low Power Light Weight MagnetoRheological Dampers written by Mohammad Mehdi Naserimojarad and published by . This book was released on 2015 with total page 71 pages. Available in PDF, EPUB and Kindle. Book excerpt: MagnetoRheological (MR) dampers are controllable shock absorption devices that are vastly used in vibration and motion control applications. MR dampers can provide an adjustable damping constant that can be used to generate controlled damping force for vibration and shocks control. In this research different methods of reducing the weight and power consumption of MR dampers are investigated. First, optimal design of MR dampers using a Genetic Algorithm is presented. Next design of novel magnetic circuits and damper mechanisms for reducing the weight and power consumption is investigated and a new low-power, low-weight mechanism is proposed. Experimental results for the proposed MR damper are further presented and compared with the results obtained from a conventional MR damper.
Download or read book Design Optimization of Magneto rheological Damper with Improved Dispersion Stability written by Md Meftahul Ferdaus and published by . This book was released on 2015 with total page 276 pages. Available in PDF, EPUB and Kindle. Book excerpt: Magnetorheological (MR) damper is one of the most advanced applications of semi active damper in controlling vibration. Due to its continuous controllability in both on and off state its practice is increasing day by day in the vehicle suspension system. MR damper's damping force can be controlled by changing the viscosity of its internal magnetorheological fluids (MRF). Still there are some problems with this damper such as MR fluid's sedimentation, optimal design configuration considering all components of the damper, power consumption and temperature rising etc. In this paper both 2-D Axisymmetric and 3-D models of MR Damper are built and finite element analysis is done widely for design optimization. Different configurations of MR damper piston, MR fluid gap, air gap and dampers housing are simulated for comparing the dampers performance variation. From the analytical results it is observed that among different configurations single coil MR damper with linear plastic air gap, top and bottom chamfered piston end and medium MR fluid gap shows better performance than other configurations by maintaining the same input current and piston velocity. Further a prototype MR fluid is developed experimentally where the carbonyl iron particles are coated with xanthan gum to reduce sedimentation and the experimental results are noticeably verifying the improved sedimentation stability. The performance of dampers' containing this new prototype MR fluid are observed by simulation models. Here the outcomes are obviously declaring damper improvement as they are delivering larger damping force compare to the MR damper with conventional fluid. In addition a power saving MR damper model has developed by finite element analysis using ANSYS software, this energy saving MR damper model is obviously showing the solution of damper's temperature rising problem. At last an experimental analysis is performed by using RD-8041-1 MR Damper. These results are compared with the optimized MR Damper's simulation results, which clearly validate the simulated results.
Download or read book MagnetoRheological Dampers for Mass and Energy Sensitive Applications written by Mohammad Mehdi Naserimojarad and published by . This book was released on 2018 with total page 103 pages. Available in PDF, EPUB and Kindle. Book excerpt: MagnetoRheological (MR) dampers have been used as reliable electronically adjustable shock and motion control devices in the past few years. Although these dampers have proven their performance in practice and the cost has decreased, their usage has been limited to high-end applications. The main drawback of MR dampers is their relatively large weight and energy consumption when compared to their passive counterparts. In this thesis, we investigate factors affecting weight and energy consumption of MR dampers and devise solutions to achieve energy-efficient and light-weight dampers. To this end, an analytic approach is presented to design and build a low-energy consumption and lightweight MR damper. It is shown that the proposed configuration can decrease the mass of MR damper significantly and reduce the energy consumption when AlNiCo alloys are utilized in the magnetic core. A proof-of-concept MR damper for mountain bike applications is designed, fabricated, characterized, and tested in the field, which meets the requirements in mountain bike industry in terms of energy consumption, compression and rebound forces, mass, size, and on-the-fly adjustability of the damping forces, by the user.
Download or read book Magneto Rheological Damper Design for Vehicle Suspension Systems written by Ali Alghamdi and published by . This book was released on 2013 with total page 191 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Design Construction and Characterization of a Shear Mode Paddle Style Magneto rheological MR Damper written by Samuel E. Rosato Jr. and published by . This book was released on 2018 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Design and Implementation of Energy Generated Magneto rheological Damper for Vehicle Suspension Systems written by Raju Ahamed and published by . This book was released on 2015 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt: Magneto rheological (MR) fluid based dampers are very promising for semi-active or adaptive suspension control system which is filled with MR fluid. Its huge advantages attract the researchers to use it in more advanced application. MR damper's damping force can be controlled by changing the viscosity of its internal magneto-rheological fluids (MRF). However the requirement of external power source is one of the major concerns. Self-powered MR damper is one of the recent advancement which is accomplished only for double ended MR damper. In this work an energy generated mono tube MR damper has been designed and investigated with power generation which has a huge demand in the vehicle suspension system. This damper combines the advantages of energy harvesting (reusing wasted energy) and MR damping (controllable damping force). This multifunctional integration would bring great benefits such as energy saving, size and weight reduction, lower cost, high reliability, and less maintenance for the MR damper systems. The proposed MR damper model consists permanent magnet and coil combination of energy generation. Two magnetic fields are induced inside this damper. One is in the outer coil of the power generator and another is the piston head coils. A 2-D Axisymmetric model of energy generated MR damper is developed in COMSOL Multiphysics where it is analyzed extensively by finite element method and its hardware model is tested by Universal Testing Machine (UTM). The complete magnetic isolation between these two fields is accomplished here, which can be seen in the finite element analysis and damper characteristic analysis. The energy generation ability of the MR damper model is tested by UTM and oscilloscope combination and the maximum output voltage is measured around 0.8 volts by oscilloscope. Finally, experimental dampers characteristic analysis is performed by using RD-8041-1 MR Damper. These results are compared with the hardware model experimental results, which clearly validate the hardware model damper characteristic.
Download or read book Finite Element Based Modeling of Magnetorheological Dampers written by Kedar Malankar and published by . This book was released on 2006 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt: As the current provided to a reasonably good amount, the force obtained was to a good extent. But it reaches saturation at around 2 amps. Thus for constraint or heat build up limitations, the second model could work the best among the three designs that we considered. For cases where higher electrical currents can be tolerated, model 2 would be the most advantageous design, since it provides the largest force among the three models.
Download or read book Magneto rheological MR Damper Design for Off road Vehicle Suspensions with Flow Blocking Ability written by Riaan F. Meeser and published by . This book was released on 2015 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Design Semi active Suspension Using Magneto rheological Damper written by Muhamad Amzansani Abd Wahab and published by . This book was released on 2010 with total page 45 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis focused on the development of semi- active suspension by using magneto-rheological damper. The MR damper is a type of damper that used MR fluid as working fluid which enables us to change damping force and setting of suspension without need to setting manually damper itself. It can be achieve by changing the current flow on it magnetic circuit.This thesis first introduces MR technology through a discussion of MR fluid and then by giving a broad overview of MR devices that is being developed. After giving the reader an understanding of MR technology and devices, MR damper basics are presented. This section includes a discussion of MR damper types, mathematical fundamentals, and an approach to magnetic circuit design. With the necessary background information covered, MR dampers for automotive use are then discussed. Then come to design part. By using specification same as Proton Waja passive damper, the model was develop by using SOLIDWORK software. The design used twin tube damper with same size of outer tube of OEM damper. The parameter like number of turn, length and diameter of the wire, current induced, magnetic field generated, head piston velocity, and force produced by MR damper was be calculated and discussed. The result show the damper produced 6475.441 Newton of maximum force when 3 ampere of current being applied to the damper. The force generated by damper at 0.5, 1, 1.5, 2, 2.5 and 3 ampere was plotted in a single graph versus piston head velocity in order to give better view of result.
Download or read book Modeling of Semi active Magnetorheological Damper for Automobile Suspension System written by Mahmudur Rahman and published by . This book was released on 2014 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt: The design of vehicle suspension systems is an active research field in which one of the objectives is to improve the passenger's comfort through the vibration reduction of the internal engine and external road disturbances. Comfort and road handling in car can be improved by including a semi-active suspension system, controlled by varying the damping based on measurements of the vehicle motions. This research deals with design and development of a quarter-car suspension using magneto-rheological damper (MR). A quarter-car of two degree-of-freedom (DOF) system is designed and constructed on the basis of the concept of a four-wheel independent suspension to simulate the actions of a semi-active vehicle suspension system. The selection of an appropriate MR damper model is crucial, since it provides the suitable current and force relationship and allows finding the appropriate force to the system. The behavioral characteristic of selected MR damper model is simulated and analyzed with different current input. An effective control structure is a key function of this research to determine the complexity of the control design and parameter tuning process. The performance of Proportional Integral Derivative (PID) and Linear Control Regulator (LQR) controller is designed based on the system requirements. In this research, the PID controller is verified experimentally under different road excitations to improve the ride quality and vehicle safety.
Download or read book Dynamic Characterization of a Magneto rheological Fluid Damper and Synthesis of a Semi active Suspension Seat written by Xiaoqing Ma and published by . This book was released on 2006 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: From the point of view of suspension damper, semi-active dampers with only minimal power requirement could be applied to achieve variable damping to enhance suspension performance under complex vibration and shock environments. Magneto-rheological (MR) fluid based dampers offer significant potential for realizing semi-actively controlled variable damping with only minimal power. The MR-fluid dampers invariably exhibit considerable hysteresis, while the damping force varies with the intensity of applied electro-magnetic field and the nature of vibration in a highly nonlinear manner. A simulation model based on symmetric and asymmetric sigmoid functions is developed to fully characterize the properties of a MR-damper as function of excitation and control current. A comprehensive laboratory test program is undertaken to characterize the damping properties of a MR damper under wide ranges of excitations and control current. The essential fundamental features are identified for the modeling task, while the model parameters are identified using multi-parameter error minimization techniques. The validity of the proposed generic model is thoroughly examined by comparing the model response with the measured data under a wide range of excitations, particularly the force saturation and the hysteresis behaviour. An independent current function is further derived that could be integrated to reported regression-based hysteresis models to enhance their prediction abilities. From the results of the study, it is concluded that the refined Bouc-Wen and the proposed generalized sigmoid function model can fully characterized the nonlinear MR damping behaviour as function of applied current and excitation. A nonlinear analytical model of a pneumatic suspension seat including the motion limiting stops is developed for synthesis and analyses of the MR-damping control algorithms. The validity of the passive suspension seat model is thoroughly examined under various deterministic and random vibration excitations of varying intensities. The results suggest that attenuation of shock as well as vibration imposes difficulties design compromise of the passive damper. Owing to the strongly nonlinear properties of the suspension-seat and the MR-damper, such as hysteresis, saturation and end-stop impacts, a 'hi-lo' semi-active control algorithm is synthesized to realized modulation of the control current and thus the damping force following the skyhook control law. A continuous modulation function is further synthesized and integrated to ensure smooth transition between the 'hi' and 'lo' states. A relative position control is further introduced to limit the frequency and severity of shock motions caused by end-stop impacts. A set of performance measures is proposed to assess the characteristics of the semi-active and the resulting integrated controller under a wide range of excitations, including deterministic excitations of continuous and transient nature and random excitations of different vehicles. The potential performance benefits of the controller design are further investigated through a hardware-in-the-loop test and simulation program. The results are used to demonstrate the validity of the MR-damper and suspension seat models, and effectiveness of the control algorithm.
Download or read book Design and Modeling of Magnetorheological Dampers written by and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: 1 v. (various pagings) : ill. ; 30 cm.
Download or read book Design and Development of a Compressible Magneto rheological Damper written by Pramod Raja and published by . This book was released on 2009 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt: The goal of this study is to assess the feasibility of a small-scale compressible magneto-rheological (CMR) damper for a tracked vehicle suspension system. The feature of the CMR damper combines the functions of a liquid spring and a controllable fluid damper together, which increases the mobility of these heavy vehicles while improving the stability and safety as well. The proposed CMR damper consists of a cylinder, piston-rod arrangement with an annular MR valve. The internal pressure in the chambers on either side of the piston develops the spring force. The damping force is developed when the fluid flows through the MR valve. A fluid-mechanics based model is considered to predict the behavior of the device under sinusoidal input. In addition, the non-dimensional analysis of the proposed model is presented which can be used as a tool for design analysis and scalability of the CMR dampers. The performance of the CMR damper filled with pure silicone oil and a MR fluid are studied under oscillatory vibrations for various frequencies and applied magnetic fields. Experimental results show good agreement with the theoretical predictions. The CMR damper generates a considerable spring rate and controllable damping force based on the required tracked vehicle specifications.
Download or read book Magneto rheological Damper Modeling Using LPV Systems written by Vicente Alberto DÍaz Salas and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The present research is focused in the dynamical modeling of a Magneto-Rheological Damper as a semi-active actuator. This device shows a complex behavior including non-linearities and hysteresis, features that are to be emulated by a dynamical system, in order to express mathematically the conduct of this device under mechanical vibrations. The M R damper is part of a semi-active suspension system, and by the use of the information of the model designed in this thesis it might be possible to produce a control design for the quarter of car system, in order to regulate the vibrations received by the suspension, incrementing the comfort and safety of the passengers in the vehicle. In order to obtain experimental data from this semi-active device, a set of tests were performed, introducing displacement and current excitation patterns into the shock absorber and measuring the dynamical response of it. Us i ng the experimental results, a set of state of the art models (Semi-Phenomenologial, Phenomenological, B l a c k - B o x) were learned to reproduce this data. This work proposes an L P V (Linear Parameter-Varying) system, as a model for the M R damper, wh i ch is capable of reproduce both the non-linear and hysteretic behavior of the damper.The L P V model proposed has the capacity to create a relationship between the main excitation variables, and the damper force, in a single structure. Due to this feature, it might later be added to a bigger strategy, such as for control or observation. The model was designed using an L P V polynomial system and an switching variable, wh i ch depends on the input velocity and current. Output results shows a higher accuracy from the L P V proposed model, in comparison wi th the state of the art models reviewed: it has E SR index average values below 0.04 while most of the studied models only achieve values below 0.1. The proposed model of this thesis provides a dynamical description of the Magneto-Rheological damper that generates a l ink between the main input variables implicated on the damper, and the output force. This feature might become an advantage to later provide an extended model of the quarter of car, and design a controller to regulate the vibrations applied to the suspension.
Download or read book Modeling Magneto rheological MR Damper Using Neuro fuzzy NF Method written by Ameer Farez Amre and published by . This book was released on 2012 with total page 61 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this thesis present about modeling magneto-rheological (MR) damper using neuro-fuzzy (NF) method. Simulation using MATLAB were use to simulate and modeling the MR damper. Previously, experimental method test were done by injecting five different currents (0A, 0.5A, 1A, 1.5A and 2A). Afterward, simulation test using NF method is done with the same process by injecting fives different current as well. For the early process, NF coding and block diagram were designed before fully run the simulation test. Damping force predict by NF was obtained. The value of learning rate and weights are tuned to obtain the desire result from NF method. Result from NF method was compared with the result collected from actual experiment. The difference between the actual damping force from experimental and the damping force obtain by NF method was calculated by plotted the error. Root mean square error (RMSE) were use to visualize the error and at the end of this project, smallest value of RMSE at the rate current of 2A that were obtain is 0.0179.
