Experiment of Electromagnetic Stiffness for Aerostatic Bearing Imbedded with Sponge-Membrane Restrictor

• Main Authors: De-Xun Xie, 謝德勲
• Other Authors: Sy-Wei Lo
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/38778170792721966577

碩士 === 國立雲林科技大學 === 機械工程系 === 102 === Among various types of restrictors, the membrane model provides the superior stability and higher load capacity. For its further application to aerostatic systems, in this thesis, the compensating parts consisting of a stainless steel membrane and sponges of different materials and thicknesses are proposed. An electromagnet is put inside the restrictor to help bend the membrane for greater air flux. Different types of restrict bolts connecting the upper and lower chambers divided by the membrane are also inserted in, including bolt having 0.8 mm long capillary, bolt drilled 2 mm diameter channel, and solid bolt. This leads to various preload on the membrane due to the pressure differences between the two sides of the membrane when the air is supplied into the lower chamber. The experiments are conducted under supply pressure 5 bar. The load-air gap curve is measured and the associated static stiffness is determined therefore. It is found that compared to the conventional 17.93 N/μm, the best result can be obtained by using channeled bolt with TADA sponge without increasing the air flux. The static stiffness is equal to 35.87 N/μm for load ranging from 216 N to 314N; the second choice is the one using bolt of 0.8 mm long capillary with TADA sponge. It can produce stiffness around 15.39 N/μm ~26.95 N/μm; while the lowest stiffness is the design composed of solid bolt and TADA sponge. The stiffness is as low as 10.78 N/μm ~21.56N/μm.