The Characteristics of a New Type of Integrated Electric-pneumatic Hybrid Actuator
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Abstract:
According to the characteristics of electric actuator and pneumatic system, a new type of ingetrated electric- pneumatic hybrid actuator is designed. It has the advantages of high positioning accuracy and strong anti-interference ability of the electric actuator, as well as large output force and clean working medium of the pneumatic servo system. The problem of cylinder disturbance in the initial stage of the motion of the new actuator is solved through the research. By adding correction unit, the motion of the hybrid actuator is more stable and reliable. The following characteristics of the new actuator are obtained through simulation analysis and experimental research on the integrated electro-pneumatic hybrid actuator. The load bearing capacity of the new actuator is far more than that of its electric actuator, and the positioning accuracy is up to the position control accuracy of the electric actuator, and the cylinder can play a very good role in facilitating. At the same time, combined with its characteristics, the electric-pneumatic hybrid actuator is applied to the RCM ( Remote Center-of-Motion ) of the medical surgery assistant robot.Keywords:
Pneumatic actuator
Rotary actuator
Pneumatic cylinder
Valve actuator
Servomechanism
Positioning accuracy of pneumatic servo actuators depends on parameters of the actuator and control system, and also on the friction force. This paper reports on new constructions of the pneumatic cylinders, which are the integral part of the servo actuator. Experimental examination of these servo actuators has shown that they could provide improved accuracy performance over the system with ordinary pneumatic cylinder.
Pneumatic actuator
Pneumatic cylinder
Rotary actuator
Electrohydraulic servo valve
Servomechanism
Pneumatics
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Three groups of pneumatic actuator and electric actuator system most commonly used in the industrial field were taken as the research object. The main cost factors of these pneumatic actuators and electric actuators were analyzed. And the assessment standards and computation model of LCCBPO(Life-cycle Costing Based on Product Owner) about the two kinds of pneumatic actuators and electric actuators were set based on LCC(life cycle cost). The LCCBPO of two kinds of the actuators mainly includes: acquisition cost,operation and maintenance cost and scrap recycling cost. The LCCBPO model was analyzed and verified through the application data of three groups of pneumatic and electric actuators in common conditions. Conclusions:(1) In the same load capacity and travel conditions,acquisition cost of pneumatic actuators is less than one of electric actuator,running-maintenance cost of rod cylinder is less than one of electric actuator,and scrap recycling cost of pneumatic actuator is less than one of electric actuator.(2) In general,overall life cycle cost of pneumatic actuators is less than one of electric actuator more economical and practical in the PTP(point to point)handling conditions.
Pneumatic actuator
Valve actuator
Rotary actuator
Scrap
Pneumatic cylinder
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A pneumatic actuator is a device that is capable of converting energy from a pressurized gas into motion. While motion can be created through other means, such as a hydraulic or electric motor, pneumatic actuators are safer, cheaper, and cleaner. Therefore, pneumatic actuators have been used widely in the field of industry automation. However, the compressibility of air and the inherent non-linearity of pneumatic actuators cause challenges in controlling accurately position of pneumatic actuators. This paper presents an accurate non-linear back-box model (NBBM) for identifying the dynamic behavior of pneumatic actuators. Once the optimized NBBM of the pneumatic actuator is obtained, it can give a generation of an effective solution for designing a position controller of that. Here, the NBBM is a multi-player perceptron neural network (MLPNN), whose parameters are optimized by using the Lervenberg-Marquardt Back Propagation (LMBP) algorithm. For the model verification, a pneumatic actuator was set up to investigate the dynamics of it as well as to generate the training data. Next, the advanced NBBM for the pneumatic actuator is performed with suitable inputs to estimate the cylinder piston displacement. Finally, the NBBM ability is evaluated by a comparison of the estimated and real pneumatic actuator performance.
Pneumatic actuator
Pneumatic cylinder
Rotary actuator
Piston (optics)
Linear actuator
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Abstract Pneumatic actuators are widely used in industry as the most reliable automation tools. The efficiency of automated systems depends on the speed of pneumatic actuators. Therefore, the development of methods studying the dynamic processes of pneumatic actuators is an urgent task. this paper concerns a mathematical model of a single-acting pneumatic cylinder actuator, which is convenient for computer calculations using universal mathematical packages. As an example of the application of a mathematical model, paper shows the influence of the piston diameter on transient processes in a pneumatic actuator.
Pneumatic actuator
Pneumatic cylinder
Piston (optics)
Pneumatics
Rotary actuator
Transient (computer programming)
Telescopic cylinder
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This paper discusses the energy consumption characteristics of electric and pneumatic actuators at reciprocating motion, and then makes a general comparison between the two types of actuator. After determining actuator models with the most used size, energy consumption is investigated at their horizontal and vertical cyclic actuations. It is found that electric actuators need a fixed amount of fundamental power even when they do not move. The fundamental power is used for operating controller and holding load. It is also found that their average efficiency at reciprocating motion is only half of the general specific efficiency of motor. Compared with electric actuators, pneumatic cylinders show a good characteristics that only little of power is consumed for valve driving and air leak at the stopping state. Therefore, when the stop time is relatively long, a pneumatic cylinder is more efficient. It is concluded that it is a misunderstanding to declare that a pneumatic cylinder is certainly inefficient compared with an electric actuator. Actuation condition should be considered when selecting an efficient actuator.
Pneumatic actuator
Reciprocating motion
Valve actuator
Rotary actuator
Pneumatic cylinder
Electric energy consumption
Mechanical energy
Piston (optics)
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Pneumatic actuators are mechanical devices used to convert pressure of compressed air or gas in mechanical action. They exercise required air pressure from the compressor to create displacement by moving a piston. Main advantage of pneumatic actuator over electric actuator is that it will always reach predefined safe position even after losing air pressure (most used type of pneumatic actuator is linear or pneumatic cylinder type). There are three types of pneumatic actuators: 1) Linear Actuator or Pneumatic cylinders; 2) Rotary Actuator or Air motors; 3) Limited angle Actuators. The air cylinder is a simple and efficient device for providing linear trust or straight-line motion with a fast response speed, particularly suitable for single purpose applications and /or where rapid movement is required.
Pneumatic actuator
Pneumatic cylinder
Rotary actuator
Compressed air
Piston (optics)
Air compressor
Linear actuator
Valve actuator
Pneumatics
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Pneumatic actuator
Pneumatic cylinder
Rotary actuator
Valve actuator
Decoupling (probability)
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Air-operated actuators have its merits that are safety, lightweight, high torque, robustness, and low cost comparing to electrical or magnetic actuators. However, the pneumatic actuator requires own control valve for introducing and releasing compressed air to drive the actuators. We designed and fabricated an integrated microvalve system for pneumatic actuators, which uses normally closed valve. Miniaturizing pneumatic control system enables robotics drive system that is combined lightweight and high power. Employing normally closed valves low power consumption. The system can control (m*n) outputs with (m+n) solenoid valves. The prototype device that is regulated by 8 solenoid valves controls independent 16 outputs.
Pneumatic actuator
Valve actuator
Solenoid
Rotary actuator
Robustness
Compressed air
Pneumatic flow control
Control valves
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Abstract Pneumatic actuators are widely used in industry as the most reliable automation tools. The performance of automated systems depends on the speed of pneumatic actuators. Therefore, the development of methods for studying the dynamic processes of pneumatic actuators is an urgent task. This paper proposes a mathematical model of a pneumatic actuator of the hoist, which is convenient for computer calculations using universal mathematical packages. Friction forces on transient processes in a pneumatic actuators are investigated as an example of the application of a mathematical model.
Pneumatic actuator
Hoist (device)
Pneumatic cylinder
Pneumatics
Rotary actuator
Transient (computer programming)
Pneumatic flow control
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