Papers by Author: Sang Kyu Bae

Abstract: This paper shows the performance analysis of a sealless cylinder with a conical type piston and one of three types of rod bearings. The piston without seal is composed of cylindrical and conical portions in the axial direction. The 2D Reynolds equation is solved with a finite difference method for the performance analysis. The relationship between self-centering force and leakage flow rate are investigated. The sealless cylinder fabricated with the proposed optimum design values was tested with three different types of rod bearings having four, five and six pockets respectively. Leakage flow rate tests were conducted to evaluate the performance of the proposed sealless cylinder.

Abstract: The fluidic muscle cylinder consists of an air bellows tube, flanges and lock nuts. Its features are softness of material and motion, simplicity of structure, low production cost and high power efficiency. Recently, unlike the pneumatic cylinder, the fluidic muscle cylinder without air leakage, stick slip, friction or seals was developed as a new concept actuator. It has characteristics such as light weight, low price, high response, durable design, long life, high power and high contraction. In this study, we carried out finite element modeling and analysis on the main design variables such as contraction ratio and force, and diameter increment of the fluidic muscle cylinder. On the basis of finite element analysis, the prototype fluidic muscle cylinder was fabricated and tested. Finally, we compared the test results with the finite element analysis.