Development of a Pneumatic Cylinder with a Micro Optical Encoder and its Applications to Position/Force Servo Systems

Yasutaka NISHIOKA; Koichi SUZUMORI; Junichi TANAKA; Atsushi SASAKI; Muneo TOYAMA; Kazutoshi KONO

doi:10.5739/jfps.39.34

Development of a Pneumatic Cylinder with a Micro Optical Encoder and its Applications to Position/Force Servo Systems

TRANSACTIONS OF THE JAPAN FLUID POWER SYSTEM SOCIETY ◽

10.5739/jfps.39.34 ◽

2008 ◽

Vol 39 (2) ◽

pp. 34-39 ◽

Cited By ~ 1

Author(s):

Yasutaka NISHIOKA ◽

Koichi SUZUMORI ◽

Junichi TANAKA ◽

Atsushi SASAKI ◽

Muneo TOYAMA ◽

...

Keyword(s):

Pneumatic Cylinder ◽

Optical Encoder ◽

Servo Systems

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The Simulation Study of a New-Type Frictionless Pneumatic Cylinder

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.278-280.337 ◽

2013 ◽

Vol 278-280 ◽

pp. 337-340 ◽

Cited By ~ 1

Author(s):

Xiao Zhu ◽

Guo Liang Tao ◽

Peng Fei Qian ◽

De Yuan Meng ◽

He Zuo

Keyword(s):

Simulation Study ◽

Structural Parameters ◽

Pneumatic Cylinder ◽

Time Varying ◽

Servo Systems ◽

Numerical Solution Method ◽

Load Carrying ◽

New Type ◽

The Stability ◽

Air Film

A new-type frictionless pneumatic cylinder with an aerostatic bearing as its piston can decrease the friction significantly. The stability and the leakage of this cylinder mostly depend on the radial load carrying capacity(RLCC) and the air consuming of the bearing. In order to make a better use of this cylinder in pneumatic servo systems, a simulation study on the influence of the structural parameters and time-varying surrounding parameters to this cylinder was carried out on the basis of a numerical solution method based on finite element method(FEM) which was constructed to solve Reynolds equations in this paper. Simulation shows that introducing a recess chamber at the end of the orifice hole can increase the RLCC significantly and smooth the sharp distribution of the pressure around the orifices in the air film, which makes the bearing working more stable; the time-varying parameters have a combined effects on the performance characteristics of the bearing.

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Redundant and Flexible Pseudorandom Optical Rotary Encoder

Elektronika ir Elektrotechnika ◽

10.5755/j01.eie.26.6.25476 ◽

2020 ◽

Vol 26 (6) ◽

pp. 10-16

Author(s):

Goran S. Miljkovic ◽

Dragan B. Denic

Keyword(s):

Error Detection ◽

Binary Code ◽

Absolute Position ◽

Optical Encoder ◽

Two Phase ◽

Servo Systems ◽

Position Information ◽

Detection Techniques ◽

Rotary Encoder ◽

Absolute Encoder

Optical encoders are mainly used in modern motion servo systems for high-resolution and reliable position and velocity feedback. Pseudorandom optical rotary encoders are single-track and use a serial pseudorandom binary code to measure absolute position. The realization and analysis of such a rotary encoder with advanced code scanning and error detection techniques, as well as an improved redundancy in operation, are presented. A presented serial code reading solution uses two phase-shifted code tracks and two optical encoder modules. So, the realized encoder, hybrid in nature, provides “output on demand” and more or less reliable position information using very efficient error checking. Compared to a standard absolute encoder, this encoder requires a smaller code disc, facilitates installation, has greater flexibility in operation, and is less sensitive to external influences.

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Development of a Four-Way Pinch-Type Servo Valve for Pneumatic Actuator

Applied Sciences ◽

10.3390/app10031066 ◽

2020 ◽

Vol 10 (3) ◽

pp. 1066

Author(s):

Kotaro Tadano ◽

Yasumasa Ishida ◽

Hisami Takeishi

Keyword(s):

Position Control ◽

Flow Characteristics ◽

Pneumatic Actuator ◽

Pneumatic Cylinder ◽

Heavy Load ◽

Servo Systems ◽

Air Compressor ◽

Servo Valve ◽

Robot Systems ◽

Control Application

Pneumatic servo valves are key components of pneumatic servo systems. Multi-degree-of-freedom systems, such as robot systems, utilize many servo valves to control their actuators. However, conventional servo valves always consume air due to leakage even when the pneumatic actuator is not moving. Hence, the consumption flow rate of the entire system corresponds to a heavy load on the air compressor. Reduction in the leakage of servo valves contributes to lower requirements for the air compressor and saves energy. In this study, we develop a four-way pinch- type pneumatic servo valve that controls flow rates by pinching air tubes to realize a leak-free servo valve. A cam to control the aperture of the flow channel is newly designed, and a control system is established. Measurement results indicate high linearity in static flow characteristics and high dynamic characteristics corresponding to 30 Hz. We experimentally confirm a good position tracking property in the position control of a pneumatic cylinder by using the developed valve. Finally, evaluation results of air consumption in a robotic control application indicate that the developed valve contributes to a significant reduction in air consumption compared to that of a conventional spool-type valve.

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