Study on Fault Simulation for Pneumatic Actuator Model

2013 ◽  
Vol 706-708 ◽  
pp. 1025-1028 ◽  
Author(s):  
Zhi Gang Feng ◽  
Xue Juan Zhang
Keyword(s):  
System Modeling ◽  
Fault Simulation ◽  
Control Valve ◽  
Pneumatic Actuator ◽  
Actuator Failure ◽  
Matlab Simulink ◽  
Pneumatic Actuators ◽  
Actuator System ◽  
Working Principle ◽  
And Control

Actuator, as the execution of the terminal unit of the control system is directly related to the safe and reliable operation of the production process, and once actuators in the system malfunction, will bring huge losses. The research on pneumatic actuator not only devote to the study of its structure, but also need to study the basic theory of the actuator system modeling, and Laid a foundation for the study of the actuator fault diagnosis. Firstly, this paper introduces the components and working principle of the pneumatic actuators which mainly include three parts: pneumatic servomotor, positioner, and control valve. Secondly, the DABlib modules of MATLAB/Simulink as the simulation model of actuator failure are introduced. Finally, we analyzed the common faults of the pneumatic servomotor, positioner, and control valve, and in the MATLAB/Simulink environment, the faults are simulated, and describes the phenomenon of two typical fault.

1208 Development of small-sized control valve and control of wearable pneumatic actuator

2006 ◽  
Vol 2006.44 (0) ◽  
pp. 451-452
Author(s):  
Takashi Masui ◽  
Tetsuya Akagi ◽  
Shujiro Dohta ◽  
Hisashi Matsushita
Keyword(s):  
Control Valve ◽  
Pneumatic Actuator ◽  
And Control

scholarly journals Research and Analysis of Automated Special Machine for Fastening of U-Frame and Screw

2019 ◽  
Vol 8 (12S) ◽  
pp. 192-195
Keyword(s):  
Material Handling ◽  
Simulation Analysis ◽  
System Modeling ◽  
Circuit Breaker ◽  
Serial Transfer ◽  
Special Machine ◽  
Actuator System ◽  
Increase Productivity ◽  
Automated Material Handling ◽  
And Control

This paper introduces the Design, Modeling and Simulation of a special tool that attaches a screw to attach the screw to a bimetal of MCB (Miniature Circuit Breaker). Problems found in the current process include complex shape and screw size and full connection operation is an intensive manual operation which makes handling difficult for the operator and also the size of the M2 screw and is headless with a cross section. In partnership with the SPM operator works as a tool to increase productivity by reducing operator fat. The system is a testament to automated material handling system, serial transfer, trap detection, attachment, automatic ejecting system, actuator system, sensors and control capabilities etc. Small screw handling and bike prospect are the major challenges in the special development of a purpose screw attachment system. System Modeling & Simulation analysis is done and the results are encouraging.

scholarly journals Development and Control of an Electro-Hydraulic Actuator System for an Exoskeleton Robot

2019 ◽  
Vol 9 (20) ◽  
pp. 4295 ◽  
Author(s):  
Dongyoung Lee ◽  
Buchun Song ◽  
Sang Yong Park ◽  
Yoon Su Baek
Keyword(s):  
Gait Cycle ◽  
Sliding Mode ◽  
Control Valve ◽  
Hydraulic Cylinder ◽  
Hydraulic Actuator ◽  
Directional Control ◽  
Robot Systems ◽  
Actuator System ◽  
And Control ◽  
Directional Control Valve

Exoskeleton robots have been developed in various fields and are divided into electric and hydraulic exoskeletons according to the actuator type. In the case of hydraulic robots, because a unidirectional pump is applied, there are limitations to the wearer’s walking. In addition, robot systems are complicated, because a directional control valve is required to change the direction of the actuator. To solve these problems, we designed the electro-hydraulic actuator (EHA) system which has both the hydraulic and electric advantages. The EHA system consists of a hydraulic bidirectional pump, a motor, a hydraulic cylinder, and various valves. For the development of the piston pump, we analyzed the gait cycle and considered the flow rate and pulsation rate. In order to reduce the size and weight of the EHA system, the valves were made from one manifold, and the hydraulic circuit was simplified. We verified that the developed EHA system is applicable to robots through position and force control experiments. Because the hydraulic system is nonlinear, we designed a sliding mode control (SMC) and compared it with the proportional integral derivative (PID) controller.

Considerations on a Mass-Based System Representation of a Pneumatic Cylinder

2009 ◽  
Vol 131 (4) ◽  
Author(s):  
M. Brian Thomas ◽  
Gary P. Maul
Keyword(s):  
Total Mass ◽  
Control Valve ◽  
System Model ◽  
Order System ◽  
Pneumatic Cylinder ◽  
State Variables ◽  
Pneumatic Actuators ◽  
Reduced Order ◽  
Highly Nonlinear ◽  
And Control

Pneumatic actuators can be advantageous over electromagnetic and hydraulic actuators in many servo motion applications. The difficulty in their practical use comes from the highly nonlinear dynamics of the actuator and control valve. Previous works have used the cylinder’s position, velocity, and internal pressure as state variables in system models. This paper replaces pressure in the state model with the mass of gas in each chamber of the cylinder, giving a better representation of the system dynamics. Under certain circumstances, the total mass of gas in the cylinder may be assumed to be constant. This allows development of a reduced-order system model.

Brake System Modeling for Simulation and Control

1999 ◽  
Vol 121 (3) ◽  
pp. 496-503 ◽  
Author(s):  
J. Christian Gerdes ◽  
J. Karl Hedrick
Keyword(s):  
System Modeling ◽  
Control Valve ◽  
Brake System ◽  
Reduced Order ◽  
Pedal Force ◽  
Modeling Process ◽  
Brake Pressure ◽  
Simplifying Assumptions ◽  
Rapid Transients ◽  
And Control

This paper presents reduced-order models of brake system dynamics derived from a physical modeling perspective. The vacuum booster model combines a static control valve with dynamic air flows, resulting in the ability to easily reproduce both static hysteresis effects and rapid transients. Following the assumption of incompressible flow, a four-state model of the brake hydraulics is presented and, subsequently, reduced to one or two states for certain applications. Experimental results support the simplifying assumptions made during the modeling process by demonstrating better agreement with the response from pedal force to brake pressure than previously displayed in the literature. These models are intended for use in the design and analysis of vehicle control systems and the evaluation of driver/vehicle interactions through dynamic simulation.

scholarly journals Dynamic behaviour of pneumatic actuators in open-loop controlled by proportional valves

2020 ◽  
Vol 180 ◽  
pp. 04012
Author(s):  
Valentin Nicolae Cococi ◽  
Carmen-Anca Safta ◽  
Constantin Călinoiu
Keyword(s):  
Control Valve ◽  
Open Loop ◽  
Pneumatic Actuator ◽  
Control Technique ◽  
Hydraulic Control ◽  
Pneumatic Actuators ◽  
Pneumatic Control ◽  
Directional Control ◽  
New Generation ◽  
Directional Control Valve

The development of proportional and servo-mechanisms hydraulic control technique offered the premises of the development of pneumatic control, too. Despite the disadvantages of the nonlinearities appeared in the pneumatic systems (air compressibility being one of the causes), the new generation of proportional equipment made it possible to have a good quality pneumatic control system in our days. The goal of the paper is to demonstrate, by using numerical simulation technique, that the proportional valves used in pneumatic actuator drives occur at a good system dynamic at a reasonable cost as against to the directional control valve as it usually used in pneumatic actuator drives.

Development of Wearable Pneumatic Actuator and Multiport Pressure Control Valve

2005 ◽  
Vol 17 (5) ◽  
pp. 529-536 ◽  
Author(s):  
Tetsuya Akagi ◽  
◽  
Shujiro Dohta
Keyword(s):  
Degrees Of Freedom ◽  
Force Feedback ◽  
Control Valve ◽  
Pressure Control ◽  
Pneumatic Actuator ◽  
Pneumatic Cylinder ◽  
Pneumatic Actuators ◽  
Care Systems ◽  
Active Research ◽  
Pressure Control Valve

Recently, force feedback devices in virtual reality and power assisted nursing care systems have received much attention and active research. Some involve an actuator and a driving device, such as a pneumatic cylinder and a control valve, worn by the user. Such devices must be compact, lightweight and flexible to avoid excessive load on and injury to the user. The purpose of our study is to develop a flexible and lightweight actuator which can be safe enough to be attached to the human body. We proposed new flexible pneumatic actuators that operate even if the actuator is deformed by external force. We tested a push-pull and flexible pneumatic actuator that moves straight and rotates. We proposed and developed a multiport pressure control valve that drives multiple wearable actuators while reducing the weight of the control valve for multiple degrees of freedom of motion.

scholarly journals Sensor-Less and Control-Less Underactuated Grippers With Pull-In Mechanisms for Grasping Various Objects

2021 ◽  
Vol 8 ◽  
Author(s):  
Atsushi Kakogawa ◽  
Yuki Kaizu ◽  
Shugen Ma
Keyword(s):  
Design Methodology ◽  
Control Valve ◽  
Planetary Gear ◽  
Dc Motor ◽  
Reduction Gear ◽  
Relief Valve ◽  
Pneumatic Actuators ◽  
Different Types ◽  
High Reduction ◽  
And Control

This paper proposes an underactuated grippers mechanism that grasps and pulls in different types of objects. These two movements are generated by only a single actuator while two independent actuators are used in conventional grippers. To demonstrate this principle, we have developed two kinds of gripper by different driving systems: one is driven by a DC motor with planetary gear reducers and another is driven by pneumatic actuators with branch tubes as a differential. Each pulling-in mechanism in the former one and the latter one is achieved by a belt-driven finger surface and a linear slider with an air cylinder, respectively. The motor-driven gripper with planetary gear reducers can pull-up the object after grasping. However, the object tends to fall when placing because it opens the finger before pushing out the object during the reversed movement. In addition, the closing speed and the picking-up speed of the fingers are slow due to the high reduction gear. To solve these drawbacks, a new pneumatic gripper by combining three valves, a speed control valve, a relief valve, and non-return valves, is proposed. The proposed pneumatic gripper is superior in the sense that it can perform pulling-up after grasping the object and opening the fingers after pushing-out the object. In the present paper, a design methodology of the different underactuated grippers that can not only grasp but also pull up objects is discussed. Then, to examine the performance of the grippers, experiments were conducted using various objects with different rigidity, shapes, size, and mass, which may be potentially available in real applications.

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