Journal of the Korean Society of Manufacturing Technology Engineers (한국생산제조학회지)

The Korean Society of Manufacturing Technology Engineers (한국생산제조학회)
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A Study on the Meter-Out and Meter-In Speed Control Characteristics in Pneumatic Cushion Cylinders

공기압 쿠션 실린더의 미터아웃/미터인 속도제어 특성에 관한 연구

  • 김도태 (경일대학교 기계자동차학부)
  • Received : 2012.11.08
  • Accepted : 2013.01.15
  • Published : 2013.02.15
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Abstract

Pneumatic cylinders are widely used to actuators in automatic equipments because they are relatively inexpensive, simple to install and maintain, offer robust design and operation, are available in a wide range of standard sizes and design alternatives. This paper presents a comparative study among the dynamic characteristics of meter-out and meter-in speed control of pneumatic cushion cylinders with a relief valve type cushion mechanism. Because of the nonlinear differential equations and a requirement for simultaneous iterative solution in a mathematical model of a double acting pneumatic cushion cylinder, a computer simulation is carried out to investigate pressure, temperature, mass flow rate in cushion chamber and displacement and velocity time histories of piston under various operating conditions. It is found that the piston velocity and pressure response in meter-in speed control are more oscillatory than with meter-out those when pneumatic cushion cylinders are driven at a high-speed. In meter-out speed control, the effective area of the flow control valve is larger than that of meter-in, and the supply pressure has to be much higher than the pressure required to move the load because it has also to overcome the back pressure in cushion chamber.

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References

  1. Peter, B., 2007, Pneumatic Drives, Springer, Germany, pp. 239-242.
  2. Kim, K. H., and So, J. D., 2008, "Displacement Control of Pneumatic Actuator Equipped with PLC and Proximity Sensors," Trans. of KSMTE, Vol. 17, No. 2, pp. 90-96.
  3. So, J. D., and Kwon, S., H., 2010, "Intermittent Strip Stock Advancing Accuracy Analysis of a Prototype Pneumatic Cylinder Driven Roll Feeder," Trans. of KSMTE, Vol. 19, No. 3, pp. 353-358.
  4. Terashima, Y., Kawakami, Y., and Kawai, S., 2000, "An Approach for Energy Conservation in Pneumatic Systems," J. of Japan Hydraulics and Pneumatics Society, Vol. 31, No. 6, pp. 157-163.
  5. Saito, K., 2008, "Cylinder Cushioning Mechanism," J. of the Japan Fluid Power System Society, Vol. 39, No. 2, pp. 97-102.
  6. Fujita, T., Tokashiki, L. R., Ishii, Y., and Kagawa, T., 1998, "Analysis of Pneumatic Cylinder Response Driven by Meter-out Circuit," J. of the Japan Hydraulics and Pneumatics Society, Vol. 29, No. 4, pp. 87-94.
  7. Fujita, T., Tokashiki, L. R., Ikegami, T., and Kagawa, T., 1999, "Speed Control Mechanism of Pneumatic Cylinder Driven by Meter-out Circuit," Trans. of SICE, Vol. 34, No. 1, pp. 1625-1631.
  8. Kim, D. T., Kim, D. S., and Ju, M. J., 2009, "A Study on the Design of a High-Speed Pneumatic Cushion Cylinder," J. of KSMTE, Vol. 18, No. 5, pp. 491-497.
  9. Kim, D. T., and Zhang, Z. J., 2010, "Analysis of Cushion Mechanism with Relief Valve for High-Speed Pneumatic Cylinders," Trans. of KSAE, Vol. 18, No. 3, pp. 95-103.