Isolation Application of Controlled and Uncontrolled Magnetorheological Dampers for Random Base Excitaion

2005 ◽  
Author(s):  
A. Narimani ◽  
M. F. Golnaraghi
Keyword(s):  
Base Isolation ◽  
Mr Damper ◽  
Optimization Method ◽  
Experimental Results ◽  
Base Excitation ◽  
Modeling And Control ◽  
Isolation Systems ◽  
Active Damper ◽  
Suspension Model ◽  
And Control

This paper presents experimental investigation of modeling and control of magnetorhological damper for transient base excitation inputs. Force characteristics of a commercially available MR damper (RD-1005-3) for shock and other transient base excitation are analytically obtained and validated using a scaled suspension model. The proposed model characterizes damper behavior more accurately and efficiently for analytical applications. The time and frequency responses of the developed model are compared with the experimental results and show good agreement. Finally, using the RMS optimization method the performance of the system for different types of controllers is compared with the optimal values of linear isolator system. Experimental results show that the performance of base isolation systems for transient and shock inputs significantly improves by utilizing a controlled semi-active damper over uncontrolled MR damper or an optimally designed passive isolator.

Modeling and Disturbance Rejection Control of a Nanopositioner With Application to Beam Steering

2003 ◽  
Author(s):  
Jason J. Gorman ◽  
Nicholas G. Dagalakis
Keyword(s):  
Disturbance Rejection ◽  
Inertial Frame ◽  
Beam Steering ◽  
Tracking Error ◽  
Robust Tracking ◽  
Base Excitation ◽  
Modeling And Control ◽  
Disturbance Rejection Control ◽  
Motion Measurements ◽  
And Control

This paper discusses the modeling and control of a nanopositioning flexure hinge mechanism with a piezoelectric actuator. A complete dynamic model for the mechanism is presented along with experimentally determined system parameters. The control design concentrates on the problem of controlling the nanopositioner when a base excitation is injected into the system. The effects of the base excitation are overcome using two approaches. The first is a robust tracking controller which is developed to cancel the excitation effect on the tracking error. The second is an inertial compensator which is designed to update the desired trajectory using base motion measurements, such that the nanopositioner performs the desired trajectory in an inertial frame. This approach is demonstrated through simulation results. These principals are being developed for use in beam steering applications which require nanoradian resolution and very low beam jitter.

Modeling and Control of Magnetorheological Dampers for Vibration Isolation

2003 ◽  
Author(s):  
A. Narimani ◽  
M. F. Golnaraghi
Keyword(s):  
Vibration Isolation ◽  
Mr Damper ◽  
Damping Force ◽  
Isolation System ◽  
Modeling And Control ◽  
Quarter Car Model ◽  
Car Model ◽  
Quarter Car ◽  
Set Up ◽  
And Control

Semi-active isolators offer significant improvement in performance over passive isolators. These systems benefit from the advantages of active systems with the reliability of the passive systems. In this work we study a vibration isolation system with a magnetorheological (MR) damper. The experimental investigation of the mechanical properties of a commercially available linear MR damper (RD-1005-3) was conducted next. The mathematical Bouc-Wen model was adopted to predict the performance of MR damper. In addition, a modified Bingham model has been developed to characterize the damper behavior more accurately and efficiently. The measured hysteresis characteristics of field-dependent damping forces are compared with the simulation results from the described mathematical models. The accuracy of a damping-force controller using the proposed method is also demonstrated experimentally. Finally, a scaled quarter car model is set up to study the performance of the control strategy. The experimental results show that with the semi-active control the vibration of the quarter car model is well controlled.

scholarly journals Neural networks on-line optimized PID controller with wind gust rejection for a quad-rotor

2021 ◽  
Author(s):  
Chiraz Ben Jabeur ◽  
Hassene Seddik
Keyword(s):  
Neural Networks ◽  
Experimental Results ◽  
Wind Gust ◽  
Pd Controller ◽  
Hostile Environment ◽  
Modeling And Control ◽  
Self Tuning ◽  
On Line ◽  
Hostile Environments ◽  
And Control

Abstract In this paper a complete methodology of modeling and control of quad-rotor aircraft is exposed. In fact, a PD on-line optimized Neural Networks Approach (PD-NN) is developed and applied to control the attitude of a quad-rotor that is evolving in hostile environment with wind gust disturbances and should maintain its position despite of these troubles. Whereas PD classical controllers are dedicated for the positions, altitude and speed control. The main objective of this work is to develop a smart Self-Tuning PD controller for attitude angles control, based on neural networks capable of controlling the quad-rotor for an optimized performance thus following a desired trajectory. Many problems could arise if the quad-rotor is evolving in hostile environments presenting irregular troubles such as wind gusts modeled and applied to the overall system. The quad-rotor has to rapidly achieve tasks while guaranteeing stability and precision and must behave quickly with regards to decision making fronting turbulences. This technique offers some advantages over conventional control methods such as PD controllers. Simulation results are achieved with the use of Matlab/Simulink environment and are established on a comparative study between PD and PD-NN controllers founded on wind disturbances application. These obstacles are applied with numerous degrees of strength to test the quad-rotor comportment. Experimental results are reached with the use of the V-REP environment with which some trajectories are tracked and then applied on a BLADE Inductrix FPV+. These simulations and experimental results are acceptable and have confirmed the efficiency of the proposed PD-NN approach. In fact, this controller has fairly smaller errors than the PD controller and has an improved ability to reject troubles. Moreover, it has confirmed to be extremely vigorous and efficient fronting disturbances in the form of wind disturbances.

Modeling and Control of a Highly Modular Underwater Vehicle with Experimental Results

2021 ◽  
Author(s):  
Erik Rentzow ◽  
Thilo Muller ◽  
Matthias Golz ◽  
Sebastian Ritz ◽  
Martin Kurowski ◽  
...  
Keyword(s):  
Underwater Vehicle ◽  
Experimental Results ◽  
Modeling And Control ◽  
And Control

A MODIFIED C-DUMP CONVERTER FOR PMSM MACHINE USED IN A FLYWHEEL ENERGY STORAGE SYSTEM

2014 ◽  
pp. 164-168
Author(s):  
K. GOPI ◽  
E. RAMAKRISHNA ◽  
K. NARASIMHAIAH ACHARI ◽  
G. KISHORE
Keyword(s):  
Energy Storage ◽  
Control Strategy ◽  
Storage System ◽  
Energy Storage System ◽  
Experimental Results ◽  
Flywheel Energy Storage ◽  
Modeling And Control ◽  
Flywheel Energy Storage System ◽  
And Control

This paper presents a modified C-dump converter for permanent magnetic synchronous (PMSM) machine used in the flywheel energy storage system. The converter can realize the energy bidirectional flowing and has the capability to recover the energy extracted from the turnoff phase of the PMSM machine. The principle of operation, modeling, and control strategy of the system has been investigated in the paper. Simulation and experimental results of the proposed system are also presented and discussed.

scholarly journals Quadcopter Modeling and Control Using Controller Hardware-in-the-Loop

2021 ◽  
Author(s):  
LARA TAVARES DE OLIVEIRA ◽  
KAIQUE SILVEIRA VIANA COSTA ◽  
KENEDY MATIASSO PORTELLA ◽  
LUCAS VIZZOTTO BELLINASO ◽  
FERNANDA DE MORAIS CARNIELUTTI ◽  
...  
Keyword(s):  
Real Time ◽  
Experimental Results ◽  
Vehicle Stability ◽  
Hardware In The Loop ◽  
Reference Tracking ◽  
Modeling And Control ◽  
The Real ◽  
Adequate Control ◽  
Laboratory Setup ◽  
And Control

Quadcopters have many applications and an efficient controller is needed for reference tracking and to maintain vehicle stability. Quadcopter tests may require expensive laboratory setup to include certain conditions such as wind, with adequate control and monitoring. In this paper a bench markmodel of quadcopter is implemented in Hardware-In-the-Loop, in order to test the quadcopter controller considering different conditions of wind. For experimental results, an LQT controller has been implemented in a DSP, while the quadcopter was implemented in the real-time simulator Typhoon HIL.

Performance of Semi-Active Base Isolation Systems under External Explosion

2017 ◽  
Vol 17 (10) ◽  
pp. 1750112 ◽  
Author(s):  
M. Mohebbi ◽  
H. D. Dadkhah
Keyword(s):  
Base Isolation ◽  
Hybrid Control ◽  
Structural Response ◽  
Mr Damper ◽  
Isolation System ◽  
Base Isolation System ◽  
Isolation Systems ◽  
Hybrid Control System ◽  
Blast Loadings ◽  
Active Base

Structures designed against earthquake loads based on using control systems may experience explosions during their lifetime. In this paper, the performance of a hybrid control system composed of a low-damping base isolation and a supplemental magneto-rheological (MR) damper under external explosion has been studied. Base isolation system has the ability of decreasing the maximum structural response under blast loadings by shifting the period of the structure. In addition, MR damper improves the base isolation system performance by controlling the base drift of the structure. Hence, in this paper, the capability of a hybrid base isolation system equipped with an MR damper at the base has been evaluated in reducing the maximum structural response and base drift under external blast loadings. To determine the voltage of the semi-active MR damper, the H2/Linear Quadratic Gaussian (LQG) and clipped-optimal control algorithms have been applied. For numerical simulations, a 10-storey shear frame subjected to blast loadings applied on different floors has been considered and the performance of the hybrid isolation system and MR damper has been studied. The results have proven the effectiveness of the hybrid control system in controlling the maximum response and base drift of the isolated structure against spherical external explosion. Furthermore, comparing the performance of the hybrid passive and semi-active base isolation systems indicates that the semi-active hybrid base isolation system is more effective in reducing the root-mean-square (RMS) value of the base drift. Similarly, it has been found that the semi-active hybrid base isolation system also performs better than the high-damping base isolation system.

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