This paper investigates the application of a controlled MR damper for a semi-active seat suspension for heavy vehicles, enabling more appropriate control algorithm. The proposed control system consists of a system controller that calculates the desired damping force using a proportional integral derivative (PID) controller tuned using genetic algorithm (GA), and a continuous state damper controller that estimates the command voltage that is required to track the desired damping force. The controlled semi-active seat suspension is compared to a passive seat suspension for predetermined base displacements. These inputs are calculated separately from the vibration of the body mass of a passive quarter-vehicle suspension. System performance criteria are evaluated in both time and frequency domains, in order to verify the effectiveness of the proposed semi-active control algorithm. The generated results show that the proposed genetic PID controller of MR seat suspension offers a considerable enhancement of the ride comfort.

Ride comfort enhancement of heavy vehicles using magnetorheological seat suspension

Integration of information models between different software systems is an urgent task. There are a large number of CAD systems that cover more than 90% of the design tasks, but the mechanism for transferring information between these programs has not yet been worked out. Despite the use of common data integration formats (such as IFC, XML, DXF, DWG, PDF), CAD model elements are represented using various indicators and characteristics. This leads to a partial loss of information on objects. Integration of the model in an incomplete form and filling in the missing parameters manually takes a lot of time and is not effective. To solve this problem, research was carried out, the result of which was the generalization and structuring of the parameters of the elements of information models of building objects. This allows you to solve the problem of heterogeneity of information about the model coming from different sources.

/pdf/a-study-of-the-concept-of-parametric-modeling-of-48n68hn5c6.pdf

A study of the concept of parametric modeling of construction objects

Passenger comfort and vehicle stability are key aspects that must be guaranteed on ground vehicles, and semi-active suspensions have offered an outstanding solution to meet these opposite objectives. This contribution describes a novel autoregressive with exogenous input (ARX) model-based predictive control strategy handled by a driver block applied on a semi-active vehicle suspension to improve passenger comfort and road holding when compared against a passive vehicle suspension system and another more complex control designs reported in the literature. The ARX model employs a driver block to reduce the computational load of the closed-loop semi-active suspension. In addition, the controller’s formulation and the case study consider the actuator’s physical constraints to achieve more realistic results. This case-study includes a one-quarter semi-active suspension with two degrees-of-freedom, and the numerical data comes from a real magnetorheological damper characterization. The results, in frequency-domain and time-domain, are measured based on specific performance criteria. A substantial improvement against a passive suspension is quantified and discussed. For a broader perspective of the findings, the results are compared against another reported work. This research effort could be the basis of further studies to achieve more robust solutions such as adaptive/optimal predictive controllers to improve vehicle’s comfort and stability.

https://www.mdpi.com/2076-0825/10/3/47/pdf

An ARX Model-Based Predictive Control of a Semi-Active Vehicle Suspension to Improve Passenger Comfort and Road-Holding

Conventional passive suspension systems lag in providing the optimum level of performance. Passive suspensions are a trade-off between the conflicting demands of comfort and control. An active suspension system provides both comfort and control along with active roll and pitch control during cornering and braking. Thus it gives a ride that is level and bump free over an incredibly rough terrain. This paper is a review the active suspension system and the modelling, simulation and control of an active suspension system in MATLAB/Simulink. The performance of the system is determined by computer simulation in MATLAB/Simulink. The performance of the system can be controlled and improved by proper tuning a proportional-integral-derivative (PID) controller. The simulation study is performed to prove the effectiveness of this control approach and the performance of the system is compared with the conventional (passive) suspension system.

Modelling simulation and control of an active suspension system

Ride with comfort is the most important demand in vehicle industry as it affects directly seats mounting. For that reason a lot of effort has been made to improve ride comfort by isolating vehicle from road irregularities as possible. That can be done by improving vehicle suspension ability to dampen the vibration induced from road irregularities during vehicle maneuver before it reaches the vehicle seat.This work investigates the effect of active damping on vehicle vibrations by presenting mathematical model of full active vehicle suspensions. That model introduced a new active damper tested recently and proved to be efficient. These dampers depend on kind of Magneto-Rheological fluid (MR). Also a mathematical model is derived for full vehicle its seat is suspended by a classical damper or Magneto-Rheological (MR) damper. Many types of roads are tested for vibration effect on the driver and suspension of the vehicle. These roads are of types repeated pulses, repeated trapezoid bumped, repeated half sine, repeated cosine and repeated simple harmonic. Also another three different roads are taken into consideration (half sine, ramp, and sudden step type). Computer programs are constructed which include a classical damper or MagnetoRheological (MR) damper and can be implemented on a full vehicle suspension. Also a simulation program (MATLAB-SIMULINK) from which any response to any changes in any parameter can be obtained. Time response curves for all types of roads are plotted for both classical and (MR) damper. A comparison between the types of roads as effect for seat (heave), and axle suspension was studied. Also the effect of voltage input to (MR) damper on vibration of the vehicle was investigated. Keyword: Magneto -Rheological fluid, Vehicle, Seat, Damper, Bumped, Road, Modeling,

Response of car seat suspended by a magneto- rheological (mr) damper

Magnetorheological dampers more commonly called as MR dampers. MR damper is an intelligent damper, which is used as automobile suspension for vibration control. MR fluids represent a class of smart materials that respond to an applied electric or magnetic field with a dramatic change in rheological behavior. The main advantages of MR dampers are that they need very less control power, has simple construction, quick response to control signal and very few moving parts. MR damper have received a great deal of attention in the last two decades due to their being a potential technology to conduct semi-active control. It is therefore vitally important to understand the dynamic behavior of such devices whose nonlinear hysteresis is a rather complicated phenomenon. The behavior of MR dampers can be presented with different mathematical models. This paper illustrates the analysis of Bouc-Wen mode for MR damper.

/pdf/a-study-of-bouc-wen-model-of-magnetorheological-fluid-damper-4c86015vcp.pdf

A Study of Bouc-Wen Model of Magnetorheological Fluid Damper for Vibration Control

Magnetorheological dampers more commonly called, MR dampers, are being developed for a wide variety of applications where controllable damping is desired. MR damper is an intelligent damper, which is used as automobile suspension for vibration control. MR fluids represent a class of smart materials whose rheological properties change in response to the application of a magnetic field. MR fluid dampers are new type of vibration control elements, having the advantages of rapid damping and stiffness changing in the presence of an applied magnetic field. MR dampers have received a great deal of attention in the last two decades due to their being a potential technology to conduct semi-active control. It is therefore vitally important to understand the dynamic behavior of such devices whose nonlinear hysteresis is a rather complicated phenomenon. Models can accurately represent the behaviour of MR dampers are essential in understanding the operation and working principles of the device. Such models can eliminate a great deal of uncertainties during the design process, which can subsequently enable control strategies for the damper to be developed efficiently and reliably. In this paper, MR fluid structure, damper description and parametric models have been presented.

A comparative study of parametric models of magnetorheological fluid suspension dampers

In this paper the phenomenon of metal flow through forging die cavity and thermo structural plasticity has been studied from the view points of mechanics, physics and metallurgy. An analytical algorithm has been established and placed in the optimistic way of sequences in need to design an intelligent knowledge based expert system. And a developed research process methodology has been used to refine the mechanics of plasticity, forging product development cycle time with improved error free quality. The research results are applied to mechanics of metal flow and strength of materials, and of course, are used as indispensable tools for analyzing the metal forging processes. This process methodology will leads to develop an automated, robust, quick, quality, accurate & decision making tool for society in order to achieve the power/cost/time/skill effectiveness even if operated by an unskilled user. This paper also summarizes a case study to validate and review the developed process automation tool in need to get a virtual prototype die model with the prediction of forging process variables and parameters for connecting rod. This work will be worth full for forging industrial applications in estimating forging load.

Application of knowledge engineering and computational intelligence for structural topology optimization of forging connecting rod die

Magneto rheological (MR) dampers are being developed for a wide variety of applications where controllable damping is desired. MR damper is an intelligent damper, which is used as automobile suspension for vibration control. Vibration control of vehicle suspension systems has been a very active subject of research, since it can provide a very good performance for drivers and passengers. MR fluids dampers are very effective to control vibration, which use MR fluids to produce controllable damping force and provide both the reliability of passive systems and the facility of active control systems with small power supply. In this paper, the response of MR dampers is presented with Bouc-Wen model.

Experimental study of magnetorheological suspension damper for vibration control

Magneto-rheological (MR) dampers are semi-active control tools that have received a lot of attention in recent years due to their structural simplicity, wide range of applications, low energy consumption, high capacity and high reliability. MR dampers are being developed for a wide variety of applications where controllable damping is desired. MR fluids represent a class of smart materials whose rheological properties change in response to the application of a magnetic field. MR fluid dampers are new type of vibration control elements, having the advantages of rapid damping and stiffness changing in the presence of an applied magnetic field. Multiple types of devices have been designed to implement this versatile fluid. Some examples of devices in which MR fluids have been emp loyed include dampers, clutches, brakes and transmissions, polishing machines and to control gun recoil on naval gun turrets. Automobile suspension and structural vibration control systems are among the most frequent uses of such dampers. The main challeng e to the expansion of using these dampers is presenting a model capable of simulating their non -linear and complex hysteresis behaviors in a suitable manner. So far many different models have been presented for simulation of hysteresis of magneto -rheological dampers.

http://inpressco.com/wp-content/uploads/2013/04/Paper30388-3921.pdf

Nitin H. Ambhore

Papers

A Study of Bouc-Wen Model of Magnetorheological Fluid Damper for Vibration Control

A comparative study of parametric models of magnetorheological fluid suspension dampers

Application of knowledge engineering and computational intelligence for structural topology optimization of forging connecting rod die

Experimental study of magnetorheological suspension damper for vibration control

A Study of Some Nonparametric Models of Magnetorheological Fluid Damper for Vibration Control