Modeling and Control for a Semi-active Suspension with a Magnetorheological Damper Including the Actuator Dynamics

2008 ◽  
Author(s):  
Luis C. Félix-Herrán ◽  
José de Jesús Rodríguez-Ortiz ◽  
Rogelio Soto ◽  
Ricardo Ramírez-Mendoza
Keyword(s):  
Active Suspension ◽  
Magnetorheological Damper ◽  
Actuator Dynamics ◽  
Modeling And Control ◽  
And Control

scholarly journals Modeling and Control of Cutter Vibration in the Presence of Random Distribution of Microhardness of Workpiece and Nonlinear Cutting Forces in Lathe Process

2011 ◽  
Vol 2011 ◽  
pp. 1-11 ◽  
Author(s):  
A. H. El-Sinawi
Keyword(s):  
Cutting Force ◽  
Cutting Forces ◽  
Random Distribution ◽  
Orthogonal Cutting ◽  
Nonlinear Dynamic Model ◽  
Linear Quadratic ◽  
Workpiece Material ◽  
Actuator Dynamics ◽  
Modeling And Control ◽  
And Control

This work presents a comprehensive approach to the control of tool's position, in the presence of machine tool structure vibration, nonlinear cutting force, and random tool vibration due to random distribution of microhardness of workpiece material. The controller is combination of Proportional and linear quadratic gaussian- (P-LQG-) type constructed from an augmented model of both tool-actuator dynamics and a nonlinear dynamic model relating tool displacement to cutting forces. The latter model is obtained using black-box system identification of experimental orthogonal cutting data in which tool displacement is the input and cutting force is the output. The controller is evaluated and its performance is demonstrated.

Acoustic Modeling and Control of Conical Enclosures

2003 ◽  
Vol 125 (1) ◽  
pp. 2-11 ◽  
Author(s):  
Kevin M. Farinholt ◽  
Donald J. Leo
Keyword(s):  
Boundary Condition ◽  
System Analysis ◽  
State Space Model ◽  
Acoustic Modeling ◽  
Conic Section ◽  
Feedback Channel ◽  
Actuator Dynamics ◽  
Modeling And Control ◽  
Resonance Frequencies ◽  
And Control

Acoustic modeling and control of conical enclosures with an actuator boundary condition is presented. Acoustic impedances are coupled with electrical and mechanical actuator dynamics to generate a coupled state-space model of the system. Analysis of the acoustic impedance illustrates that pole-zero cancellation occurs when the length of the conic section becomes large compared to the distance from the apex to the actuator boundary condition. Used as a platform for control design, positive position feedback is applied for acoustic attenuation. The model predicts the first four resonance frequencies to within 1.75 percent of experimentally measured values. Standing waveforms are presented and related to the effects of the actuator boundary condition. A feedback controller is implemented on an experimental testbed with global reductions of 38.4 percent or 4.2 dB observed over a 50-400 Hz frequency range. Experimental results demonstrate that global sound attenuation is possible with a single feedback channel.

Design, modeling, and control of a magnetorheological rotary damper for scissor seat suspension

2020 ◽  
Vol 234 (9) ◽  
pp. 2402-2416
Author(s):  
Jianqiang Yu ◽  
Xiaomin Dong ◽  
Xuhong Wang ◽  
Junli Li ◽  
Biao Li
Keyword(s):  
Experimental Tests ◽  
Nonlinear Damping ◽  
Magnetorheological Damper ◽  
Hysteretic Model ◽  
Active System ◽  
Backbone Curve ◽  
Modeling And Control ◽  
Seat Suspension ◽  
Damping Characteristics ◽  
And Control

This research investigates the design, modeling, and control of an improved magnetorheological rotary damper for seat suspension. A magnetorheological damper with optimized flux path is developed to improve the distribution of magnetic field. Its dynamic damping characteristics are tested by MTS machine under sinusoidal excitations. To describe the nonlinear damping characteristics of magnetorheological damper, a hysteretic model based on backbone curve is selected by comparing with other models. To verify the feasibility of seat suspension with the proposed magnetorheological damper, the simulated analysis and experimental tests are conducted. A dynamic model of scissor seat suspension with rotary damper is constructed and simplified. The performances of semi-active system show that the seat suspension with the proposed damper can reduce vibration efficiently.

Improve Hunting of a Railway Vehicle Using Semi-Active Primary Suspension

2006 ◽  
Author(s):  
Abbas Fotoohi ◽  
Aghil Yousefi-Koma
Keyword(s):  
Lateral Displacement ◽  
Control Design ◽  
Active Suspension ◽  
Design Tool ◽  
Railway Vehicle ◽  
Physical Damage ◽  
Modeling And Control ◽  
Vehicle Simulation ◽  
The Stability ◽  
And Control

Hunting is a very common instability phenomenon in rail vehicles operating at high speeds. The hunting phenomenon is a self excited lateral oscillation produced by the forward speed of the vehicle and the wheel-rail interactive forces caused by the conicity of the wheel-rail contours and the friction-creep characteristics of the wheel-rail contact geometry. Hunting can lead to severe ride discomfort and eventual physical damage to wheels and rails. This research is conducted to demonstrate advantages of semi-active primary suspension in railway vehicle for control of hunting phenomenon. Semi-active suspension consists of some actuators on each bogie located in primary suspension position in addition to vertical passive dampers. A simple on-off switching is used here and the actuator force is determined regarding to wheelset displacement. An integration of a control design tool, i.e. MATLAB, together with a tool for railway vehicle simulation, i.e. ADAMS/Rail is utilized for modeling and control design simultaneously. Analysis has been performed on a traditional bogie model with passive primary suspension and on a new bogie model with semi-active suspension. The effects of semi-active suspension system on lateral displacement and yaw motion of wheelset have also been investigated. Results show that the semi-active suspension improves the stability by controlling displacement magnitude.

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