2A1-E08 Development of a Flexible Pneumatic Linear Actuator with Unlimited Stroke Length and High Speed Motion(Mechanism and Control for Actuator(1))
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We propose a novel pneumatic actuator for applying to inspection robots in narrow spaces. This actuator is 25 mm in maximum diameter and has unlimited stroke length and high speed motion by converting expansive power of pressurized tube to rolling motion. The maximum generating force of it is more than 20 N at 500 kPa pressure and the maximum linear motion velocity is more than 9 m/s. In this paper, we established a dynamic model of this actuator and simulated the generating force to applied pressure. Furthermore, we carried out the measurement experiment of the generating force in order to verify the validity of the dynamic model and optimize the actuator.Keywords:
Linear actuator
Pneumatic actuator
Rotary actuator
Stroke
Linear motion
Electro-hydraulic actuator
Expansive
Mechanical linear actuators are employed extensively in various industrial applications where a linear motion is required. Typical linear mechanical actuators such as ball screws, chain drives, scotch yokes and rack-and-pinion systems convert a rotary motion into a linear motion using different mechanisms. In this paper, a novel magnetic rotary-to-linear actuator is introduced. The proposed actuator utilizes permanent magnets to transmit mechanical power from a rotary part (the rotor) to a linear part (the slider) or vice versa. There is no mechanical contact between the rotor and the slider which results in higher reliability, less maintenance requirements and longer lifetime. Although, this rotary-to-linear system is intended to replace mechanical linear actuators, it could also be used in linear-to-rotary systems such as in wave energy converters. The system was analyzed and simulated using 3-D Finite Element Analysis (FEA). Moreover, a prototype was built, and the concept of operation was experimentally verified.
Linear actuator
Rotary actuator
Linear motion
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This chapter considers the output device of the hydraulic control system. This device, which the authors call the actuator, is the mechanism that is responsible for delivering force and motion to the external load system of a given application. The chapter considers two actuator types: linear actuators and rotary actuators. It discusses the performance characteristics of linear actuators. These characteristics include a consideration of the actuator efficiency and the quasi-steady operation and function of the actuator. Four hydraulic actuators are used to operate a car lift that is used within an auto mechanic garage. The chapter also discusses the performance characteristics of rotary actuators. The efficiency equations for the rotary actuator (hydraulic motor) are similar to those of the hydraulic pump and the discussion of pump efficiency measurement is also applicable to the efficiency measurement of the hydraulic motor.
Rotary actuator
Electro-hydraulic actuator
Lift (data mining)
Linear actuator
Plant
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This Letter presents a flexible wire‐driven linear actuator using a bio‐inspired sealing method that allows to replace a rigid rod by a flexible one and reduce the size of a robot link containing pneumatic or hydraulic linear actuators. Conventional pneumatic or hydraulic linear actuator sealing hinders the use of flexible wires as actuator rods. In contrast, the proposed tube sealing resembles a long balloon wrapping around the wire and stretching or contracting with the wire rod motion. Therefore, the wire is separated from the chamber and prevents fluid leakage through the flexible wire rod. This sealing method is inspired by earthworm which has slippery skin and stretching or contracting motion. The authors fabricated a prototype wire rod pneumatic linear actuator using the proposed tube seal and conducted leakage tests. In addition, the authors evaluated linearity between the input pressure and output force to determine the linear actuator performance.
Linear actuator
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We propose a novel pneumatic actuator for applying to inspection robots in narrow spaces. This actuator is 25 mm in maximum diameter and has unlimited stroke length and high speed motion by converting expansive power of pressurized tube to rolling motion. The maximum generating force of it is more than 20 N at 500 kPa pressure and the maximum linear motion velocity is more than 9 m/s. In this paper, we established a dynamic model of this actuator and simulated the generating force to applied pressure. Furthermore, we carried out the measurement experiment of the generating force in order to verify the validity of the dynamic model and optimize the actuator.
Linear actuator
Pneumatic actuator
Rotary actuator
Stroke
Linear motion
Electro-hydraulic actuator
Expansive
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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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Electro Mechanical linear Actuators as the name suggests are linear actuators operated by electric motor. The linear motion is desirable to drive a high inertia weapon system in elevation axis. In this paper, design and development aspects of an Electromechanical linear actuator using Roller screw has been attempted. Initial Comparison with ball screw drive suggests that roller screws are favorable for high dynamic load application. Selection and functional parameters of roller screw had been evaluated to optimize the linear actuator based on roller screw. This paper studies in detail the design aspects of an electromechanical linear actuator. The variation of different parameters with respect to Lead of the roller screw has been studied.
Linear actuator
Ball screw
Rotary actuator
Linear motion
Worm drive
Linear relationship
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This research is aimed at generating an efficiency map for a linear hydraulic-actuator that is controlled using an open-centered 4-way valve. Using the basic configuration of a double rod, double-acting linear actuator, equations for describing the input and output power of the actuator are written and nondimensionalized to produce a nondimensional map for the efficiency of the actuator itself. In conclusion, the actuator is shown to operate below a wide open valve (WOV) line with efficiencies that are typically less than 50%. Note that the WOV line describes the maximum actuator-force that may be achieved at a given actuator-velocity. While the actuator chosen for this paper is common, extensions of the methods used in this study may be applied to double-acting, single-rod designs or single-acting, single-rod designs. Furthermore, it is anticipated that this type of analysis may also be used to study the effects of power regenerating valves and for predicting the efficiency improvements that may be gained for linear hydraulic-actuators that use this type of valve design.
Rotary actuator
Linear actuator
Electro-hydraulic actuator
Valve actuator
Plant
Line (geometry)
Fluid power
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Citations (5)
Rotary actuator
Pneumatic actuator
Electro-hydraulic actuator
Compressed air
Mechanical energy
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Citations (1)
Compact motor mounted on a stationary base converts rotary to linear motion. The motor rotates a gear train assembly so that the end of an arm attached to the assembly moves in a linear path.
Linear actuator
Linear motion
Rotary actuator
Base (topology)
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Recently, colonoscopy has become much more important with increasing number of colonic diseases. However, the inspection time depends on the doctor's skill strongly. In this research, we aim at development of a tube type rubber pneumatic actuator for assisting insertion of a large intestine endoscope. This actuator can be wound around endoscopes in a spiral configuration. In previous paper, two types of actuator were developed and some experiments were conducted. However, there were drawbacks, one actuator could not generate enough output, and the other one was difficult to mount on endoscopes. In this paper, novel actuator has been designed by non-linear FEM (Finite Element Method) to realize high mountability and drivability. The actuator is configured with three air chambers, and by applying pneumatic pressure to each chamber in proper sequence, elliptical motion of the actuator has been confirmed by non-linear FEM analysis and experiments using motion capture system. Moreover the self propelling velocity and the traction force have been increased compared to previous actuators and effectiveness of this actuator has been confirmed from the phantom experiments.
Rotary actuator
Pneumatic actuator
Linear actuator
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Citations (25)