Enhanced performance controller design for stochastic systems by adding extra state estimation onto the existing closed loop control

2016 ◽  
Author(s):  
Yuyang Zhou ◽  
Qichun Zhang ◽  
Hong Wang
Keyword(s):  
State Estimation ◽  
Closed Loop ◽  
Stochastic Systems ◽  
Controller Design ◽  
Closed Loop Control ◽  
Loop Control ◽  
Extra State

Development of Hardware Simulator and Controller for Web Transport Process

2005 ◽  
Vol 128 (1) ◽  
pp. 378-381 ◽  
Author(s):  
Jeetae Kim
Keyword(s):  
Force Control ◽  
Transport Process ◽  
Closed Loop ◽  
Controller Design ◽  
Transport Model ◽  
Tension Force ◽  
Closed Loop Control ◽  
Measuring Device ◽  
Loop Control ◽  
Process Simulator

In this study a hardware simulator and controller for web transport process are developed. First the dynamics of web transport process is analyzed for simulator and controller design. An example Polypropylene transport process is investigated and its simplified transport model is derived. Then the web transport process simulator and its controller are developed. Accurate tension force control is needed to produce high quality web formed materials. The process controller uses the loadcell as a tension measuring device and closed-loop control is used for tension force regulation. The response of the system is tested under the disturbances in tension and the experimental results show that the system regulates tension disturbances properly.

Controller Design for Active Closed-Loop Control of Cavity Flows

2004 ◽  
Author(s):  
Hitay Ozbay ◽  
Onder Efe ◽  
Mo Samimy ◽  
Edgar Caraballo ◽  
Jim DeBonis ◽  
...  
Keyword(s):  
Closed Loop ◽  
Controller Design ◽  
Closed Loop Control ◽  
Cavity Flows ◽  
Loop Control

Nonlinear Model-Based Controller Design for a Hydraulic Rack and Pinion Gear Actuator

2018 ◽  
Author(s):  
Pauli Mustalahti ◽  
Jouni Mattila
Keyword(s):  
Closed Loop ◽  
Controller Design ◽  
Dynamical Behavior ◽  
Control Design ◽  
Closed Loop Control ◽  
Loop Control ◽  
Hydraulic Manipulators ◽  
Pinion Gear ◽  
Hydraulic Manipulator ◽  
Heavy Loads

Hydraulic manipulators are extensively utilized to move heavy loads in many industrial tasks. In commercial applications, a manipulator base is required to rotate a motion range of the full 360°. This is usually implemented by using a hydraulic rack and pinion gear actuator. Due to the manipulator’s long reach and heavy loads, manipulator tip acceleration can produce significant torque to the rotation gear in free-space motion. Imposed by nonlinear dynamical behavior (involving, e.g., the gear backlash and actuator friction) added to high inertia, a system closed-loop control design becomes a challenging task. An advanced closed-loop control enables to increase the automation-level of hydraulic manipulators. This study designs a novel subsystem-dynamics-based controller for a hydraulic rack and pinion gear actuator utilizing the control design principles of the virtual decomposition control (VDC) approach. An adaptive backlash compensation is incorporated in the control design. Furthermore, the proposed controller is implemented in previously-designed state-of-the-art hydraulic manipulator control. The stability of the overall control design is proven. Experiments with a full-scale commercial hydraulic manipulator demonstrate the effectiveness of the proposed adaptive backlash compensation and the overall control performance.

scholarly journals Limit Cycle Behavior of Smart Fluid Dampers Under Closed Loop Control

2005 ◽  
Vol 128 (4) ◽  
pp. 413-428 ◽  
Author(s):  
Neil D Sims
Keyword(s):  
Limit Cycle ◽  
Closed Loop ◽  
Controller Design ◽  
Nonlinear Models ◽  
Control Strategies ◽  
Nonlinear Behavior ◽  
Closed Loop Control ◽  
Loop Control ◽  
Fluid Dampers ◽  
Limit Cycle Behavior

Semiactive vibration dampers offer an attractive compromise between the simplicity and fail safety of passive devices, and the weight, cost, and complexity of fully active systems. In addition, the dissipative nature of semiactive dampers ensures they always remain stable under closed loop control, unlike their fully active counterparts. However, undesirable limit cycle behavior remains a possibility, which is not always properly considered during the controller design. Smart fluids provide an elegant means to produce semiactive damping, since their resistance to flow can be directly controlled by the application of an electric or magnetic field. However, the nonlinear behavior of smart fluid dampers makes it difficult to design effective controllers, and so a wide variety of control strategies has been proposed in the literature. In general, this work has overlooked the possibility of undesirable limit cycle behavior under closed loop conditions. The aim of the present study is to demonstrate how the experimentally observed limit cycle behavior of smart dampers can be predicted and explained by appropriate nonlinear models. The study is based upon a previously developed feedback control strategy, but the techniques described are relevant to other forms of smart damper control.

Type-III closed loop control systems-Digital PID controller design

2013 ◽  
Vol 23 (10) ◽  
pp. 1401-1414 ◽  
Author(s):  
Konstantinos G. Papadopoulos ◽  
Nikolaos D. Tselepis ◽  
Nikolaos I. Margaris
Keyword(s):  
Control Systems ◽  
Pid Controller ◽  
Closed Loop ◽  
Controller Design ◽  
Closed Loop Control ◽  
Loop Control ◽  
Type Iii ◽  
Digital Pid ◽  
Pid Controller Design

Controller Design for Precise and Efficient Industrial Cylinder Drives Using Independent Metering Valves

2016 ◽  
Author(s):  
Giacomo Kolks ◽  
Jürgen Weber
Keyword(s):  
Closed Loop ◽  
Controller Design ◽  
Dynamic Properties ◽  
Translational Motion ◽  
Multiple Input Multiple Output ◽  
Mode Switching ◽  
Energetic Efficiency ◽  
Closed Loop Control ◽  
Loop Control ◽  
Operating Modes

Valve controlled cylinder drives are an obvious choice whenever high loads are manipulated in translational motion with demanding requirements in terms of dynamic properties, accuracy, and costs. Improvements of energetic efficiency of valve control can be achieved by separating metering edges, allowing for different operating modes and thus adapting to different load scenarios. In this paper, multiple-input-multiple-output closed loop control approaches are investigated in order to control cylinder speed and pressure in one cylinder chamber for a configuration with five 2/2-directional valves. By utilizing the flatness property of the system, the flatness-based tracking controller and the flatness based internal model controller will be described, developed and tested. They are adapted to the excessive number of command variables by introducing extended input. Based on validation on a test rig, the characteristics of both control approaches are pointed out. The control strategy is fitted to a smooth mode switching algorithm published by the authors previously. It is shown that by making use of the degrees of freedom involved in the presented system, different operating modes can be switched smoothly in closed loop control. This contributes to the applicability of energetic potentials of independent metering.

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