Dynamic Constraint-Based Energy-Saving Control of Pneumatic Servo Systems

2005 ◽  
Vol 128 (3) ◽  
pp. 655-662 ◽  
Author(s):  
Khalid A. Al-Dakkan ◽  
Eric J. Barth ◽  
Michael Goldfarb
Keyword(s):  
Energy Saving ◽  
Degrees Of Freedom ◽  
Energy Savings ◽  
Sliding Mode ◽  
Servo Systems ◽  
Control Approach ◽  
Dynamic Constraint ◽  
Energy Saving Control ◽  
Control Methodology ◽  
Spool Valve

This paper proposes a control approach that can provide significant energy savings for the control of pneumatic servo systems. The control methodology is formulated by decoupling the standard four-way spool valve used for pneumatic servo control into two three-way valves, then using the resulting two control degrees of freedom to simultaneously satisfy a performance constraint (which for this paper is based on the sliding mode sliding condition), and an energy-saving dynamic constraint that minimizes cylinder pressures. The control formulation is presented, followed by experimental results that indicate significant energy savings with essentially no compromise in tracking performance relative to control with a standard four-way spool valve.

A Multi-Objective Sliding Mode Approach for the Energy Saving Control of Pneumatic Servo Systems

2003 ◽  
Author(s):  
Khalid A. Al-Dakkan ◽  
Eric J. Barth ◽  
Michael Goldfarb
Keyword(s):  
Energy Saving ◽  
Degrees Of Freedom ◽  
Energy Savings ◽  
Sliding Mode ◽  
Experimental Results ◽  
Servo Systems ◽  
Control Approach ◽  
Servo Actuator ◽  
Actuator Control ◽  
Spool Valve

This paper proposes a variation on a sliding mode control approach that provides significant energy savings for the control of pneumatic servo systems. The control methodology is formulated by first decoupling the standard four-way spool valve used for pneumatic servo control into two three-way valves, then using the resulting two control degrees of freedom to simultaneously satisfy both the sliding mode sliding condition and a dynamic constraint that minimizes airflow. The control formulation is presented, followed by experimental results that indicate significant energetic savings with essentially no compromise in tracking performance relative to a standard four-way spool valve approach. Specifically, relative to standard four-way spool valve pneumatic servo actuator control, the experimental results indicate energy saving of 27 to 45%, depending on the desired tracking frequency.

Energy-Efficient Servo Control of Pneumatic Systems via Direct Cross Flow

2006 ◽  
Author(s):  
Xiangrong Shen ◽  
Michael Goldfarb
Keyword(s):  
Energy Saving ◽  
Mass Flow ◽  
Energy Savings ◽  
Sliding Mode ◽  
Cross Flow ◽  
Servo Control ◽  
Control Approach ◽  
Direct Cross ◽  
Pneumatic Servo System ◽  
Spool Valve

This paper proposes a structure and control approach for the energy saving servo control of a pneumatic servo system. The energy saving approach is enabled by supplementing a standard four-way spool valve controlled pneumatic actuator with an additional two-way valve that enables flow between the cylinder chambers. The "crossflow" valve enables recirculation of pressurized air, and thus enables the extraction of stored energy that would otherwise be exhausted to atmosphere. A control approach is formulated that supplements, to the extent possible, the mass flow required by a sliding mode controller with the recirculated mass flow provided by the crossflow valve. Following the control formulation, experimental results are presented that indicate energy savings of 25% to 52%, with essentially no compromise in tracking performance relative to the standard sliding mode control approach (i.e., relative to control via a standard four-way spool valve, without the supplemental flow provided by the crossflow valve).

Energy Saving in Pneumatic Servo Control Utilizing Interchamber Cross-Flow

2006 ◽  
Vol 129 (3) ◽  
pp. 303-310 ◽  
Author(s):  
Xiangrong Shen ◽  
Michael Goldfarb
Keyword(s):  
Energy Saving ◽  
Mass Flow ◽  
Energy Savings ◽  
Sliding Mode ◽  
Cross Flow ◽  
Servo Control ◽  
Control Approach ◽  
Pneumatic Servo System ◽  
And Control ◽  
Spool Valve

This paper proposes a structure and control approach for the energy saving servo control of a pneumatic servo system. The energy saving approach is enabled by supplementing a standard four-way spool valve controlled pneumatic actuator with an additional two-way valve that enables flow between the cylinder chambers. The “crossflow” valve enables recirculation of pressurized air, and thus enables the extraction of stored energy that would otherwise be exhausted to the atmosphere. A control approach is formulated that supplements, to the extent possible, the mass flow required by a sliding mode controller with the recirculated mass flow provided by the crossflow valve. Following the control formulation, experimental results are presented that indicate energy savings of 25–52%, with essentially no compromise in tracking performance relative to the standard sliding mode control approach (i.e., relative to control via a standard four-way spool valve, without the supplemental flow provided by the crossflow valve).

Theory and Experiments on the Compliance Control of Redundant Robot Manipulators

1990 ◽  
Vol 112 (4) ◽  
pp. 653-660 ◽  
Author(s):  
H. Kazerooni ◽  
K. G. Bouklas ◽  
J. Guo
Keyword(s):  
Degrees Of Freedom ◽  
Control Method ◽  
Robot Manipulators ◽  
Industrial Robot ◽  
Redundant Robot ◽  
Control Approach ◽  
Six Degrees Of Freedom ◽  
The Stability ◽  
Control Methodology ◽  
Theory And Experiments

This work presents a control methodology for compliant motion in redundant robot manipulators. This control approach takes advantage of the redundancy in the robot’s degrees of freedom: while a maximum six degrees of freedom of the robot control the robot’s endpoint position, the remaining degrees of freedom impose an appropriate force on the environment. To verify the applicability of this control method, an active end-effector is mounted on an industrial robot to generate redundancy in the degrees of freedom. A set of experiments are described to demonstrate the use of this control method in constrained maneuvers. The stability of the robot and the environment is analyzed.

Adaptive Integral Base Sliding Mode Tracking Control of Piezoelectric Actuators

2009 ◽  
Author(s):  
Mohammad Sheikh Sofla ◽  
Seyed Mehdi Rezaei ◽  
Mohammad Zareinejad
Keyword(s):  
Sliding Mode ◽  
Piezoelectric Actuators ◽  
Uncertain System ◽  
Hysteretic Behavior ◽  
Control Approach ◽  
Practical Applications ◽  
Hysteresis Nonlinearity ◽  
Control Scheme ◽  
Integral Sliding Surface ◽  
Control Methodology

This paper presents an adaptive integral sliding mode control scheme for precise trajectory tracking of piezoelectric actuators (PEAs). This control methodology is proposed considering the problems of unknown or uncertain system parameters, hysteresis nonlinearity, and external load disturbances. The hysteretic behavior is represented by Bouc–Wen hysteresis model. It is shown that the nonlinear response of the model due to the hysteresis effect, acts as a bounded disturbance. Then base on this fact an adaptive robust controller is proposed, where an integral sliding surface is utilized to achieve the desired tracking performance. By using the proposed control approach the asymptotical stability in displacement tracking and robustness to the dynamic load disturbance can be provided. Finally, Experimental results are illustrated to verify the efficiency of the proposed method for tracking in various range of frequency and load which are common in practical applications.

scholarly journals Finite-Time Composite Position Control for a Disturbed Pneumatic Servo System

2016 ◽  
Vol 2016 ◽  
pp. 1-10 ◽  
Author(s):  
Xiaojun Wang ◽  
Jiankun Sun ◽  
Guipu Li
Keyword(s):  
Finite Time ◽  
State Feedback ◽  
Position Control ◽  
Sliding Mode ◽  
State Feedback Control ◽  
Servo Systems ◽  
Control Approach ◽  
Composite Control ◽  
Control Scheme ◽  
Pneumatic Servo System

This paper investigates the finite-time position tracking control problem of pneumatic servo systems subject to hard nonlinearities and various disturbances. A finite-time disturbance observer is firstly designed, which guarantees that the disturbances can be accurately estimated in a finite time. Then, by combining disturbances compensation and state feedback controller together, a nonsmooth composite controller is developed based on sliding mode control approach and homogeneous theory. It is proved that the tracking errors under the proposed composite control approach can be stabilized to zero in finite time. Moreover, compared with pure state feedback control, the proposed composite control scheme offers a faster convergence rate and a better disturbance rejection property. Finally, numerical simulations illustrate the effectiveness of the proposed control scheme.

Research on Cooling Tower Fan Energy Saving Control System Based on PLC and Inverter Technology

2013 ◽  
Vol 281 ◽  
pp. 537-541
Author(s):  
Jian Ping Chen ◽  
Xiao Kuan Shi ◽  
Hai Jun Li
Keyword(s):  
Control System ◽  
Energy Saving ◽  
Energy Savings ◽  
Cooling Tower ◽  
Water System ◽  
Circulating Water ◽  
Production Practice ◽  
Characteristics Analysis ◽  
Circulating Water System ◽  
Energy Saving Control

In order to improve the effective utilization of the cooling tower fan industrial circulating water system, and to achieve the purpose of energy saving, the paper developed a closed loop cooling tower fan is jointly controlled by the PLC and inverter energy-saving control system. With the theoretical energy-saving fan characteristics analysis, PLC is used as a controller. Combined with inverter technology, remote real-time communication is carried out via RS485 bus with the host computer, and centralized monitoring to operating status of many sets of fans is realized. Production Practice has proved that under the premise of ensuring the water temperature standards, the inverter deceleration of the cooling tower fan makes significant energy savings effect.

Sign in / Sign up

Export Citation Format

Share Document