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Air bearings (also known as aerostatical or aerodynamical bearings) are bearings that use a thin film of pressurized air to provide an exceedingly low friction load-bearing interface between surfaces. The two surfaces do not touch. As they are contact-free, air bearings avoid the traditional bearing-related problems of friction, wear, particulates, and lubricant handling, and offer distinct advantages in precision positioning, such as lacking backlash and static friction, as well as in high-speed applications. ....etc

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An advantage of making bridges moveable is the lower cost, due to the absence of high piers and long approaches. The principal disadvantage is that the traffic on the bridge must be halted when it is opened for passages. For seldom-used railroad bridges over busy channels, the bridge may be left open and then closed for train passages. For small bridges, bridge movement may be enabled without the need for an engine. Some bridges are operated by the users, especially those with a boat, others by a bridgeman (or bridge tender); a few remotely usi ....etc

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bridge bearing and stability ppt

Abstract

The designers of bridges must assure themselves that bridge bearings can transmit the high horizontal loads of current designs. The proportion of horizontal to vertical load is increasing due to the current trend toward continuous, joint free, redundant structures. From the 10 20% level of some years ago, horizontal forces are now found at and above the corresponding vertical loads. These horizontal forces require that bearing stability be investigated. Two levels of stability criteria, for normal c ....etc

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hi
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air bearing seminar topic ppt download

Air bearings are designed to lift loads away from the floor surface and float them off to their destination on a thin film of air. Each individual air bearing is housed in a load module which contains an air flow control valve to regulate the operation of that air bearing.

When compressed air is introduced into the air bearing, the bearing initially inflates to form a seal between the bearing and the floor surface. As the air bearing is further pressurized it is forced to expel compressed air from the ex ....etc

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NBC Bearings is the product of National Engineering Industries Limited (NEI), a part of the CK Birla Group, which manufactures a wide range of bearings for the automotive, industrial and railways. The company had a gross turnover of Rs 1352 crores in 2013-14.NEI manufactures bearings in about 1000 different sizes.The foreign acquisition plans are in advanced stages with the company in talks with 5-6 firms for a buyout. The acquisitions being considered are in Eastern Europe, Germany and Spain. According to Rohit Saboo, the President and CEO, th ....etc

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