منابع مشابه
The Air Bearing Advantage
All moving objects possess six degrees of freedom – three linear and three rotary. The task of a linear motion guideway is to eliminate, as closely as possible, five of these degrees of freedom, leaving a single rotary or linear axis of motion. Air bearings are the purest and highest performance means of defining linear or rotary motion, and have substantial advantages over conventional mechani...
متن کاملComparison of rotational speeds and torque properties between air-bearing and ball-bearing air-turbine handpieces.
We examined the effects of air pressure on the free-running speed of air-bearing and torque-type ball-bearing air-turbine handpieces. The air pressure for the former should be kept at a certain high level to maintain the stable super-thin air-bearing film and to provide the quasi-constant speed of around 420,000 to 480,000 rpm. On the other hand, the air pressure for the latter could be adjuste...
متن کاملHistorical Review of Air-Bearing Spacecraft Simulators
An overview of air-bearing spacecraft simulators is provided. Air bearings have been used for satellite attitude determination and control hardware veri cation and software development for nearly 45 years. It is interesting to consider the history of this technology: how early systems were rst devised and what diverse capabilities current systems provide. First a survey is given of planar sy...
متن کاملSelf-calibration for Air-bearing Rotary Encoders
INTRODUCTION High-accuracy rotary encoders are required for rotational axis position measurement in ultraprecision manufacturing and measurement equipments. A typical rotary encoder is made of a glass disk with a fine grating pattern and a scanning read head unit. Digital pulse trains are output from the read head to represent the disk rotary position. The angular measurement accuracy of such a...
متن کاملIsothermal Analysis of Elliptic Bore Journal Bearing Considering Isotropic Roughness
121804-6565-IJMME-IJENS © August 2012 IJENS I J E N S Abstract— Finite journal bearing of elliptic bore and circular bush is analyzed considering the isotropic roughness in the bearing surfaces. The angle of inclination of the major axis of the sleeve to the load line and the attitude angle are kept constant while evaluating all the performance parameters. Film shape due to the rough elliptic b...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Transactions of the Japan Society of Mechanical Engineers
سال: 1953
ISSN: 0029-0270,2185-9485
DOI: 10.1299/kikai1938.19.86_45