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Bearings and Lubrication
Published in Ansel C. Ugural, Mechanical Engineering Design, 2022
Self-contained bearings contain the lubricant in the bearing housing, which is sealed to prevent oil loss. Oil may be gravity fed from a reservoir or cup above the bearing. Obviously, a bearing of this type is economically more desirable because it requires no expensive cooling or lubricant-circulating system. Self-contained bearings are known as pillow-block or pedestal bearings.
Bearings and Lubrication
Published in Ansel C. Ugural, Youngjin Chung, Errol A. Ugural, Mechanical Engineering Design, 2020
Ansel C. Ugural, Youngjin Chung, Errol A. Ugural
Self-contained bearings contain the lubricant in the bearing housing, which is sealed to prevent oil loss. Oil may be gravity fed from a reservoir or cup above the bearing. Obviously, a bearing of this type is economically more desirable because it requires no expensive cooling or lubricant-circulating system. Self-contained bearings are known as pillow-block or pedestal bearings.
Bearings and Lubrication
Published in Ansel C. Ugural, Youngjin Chung, Errol A. Ugural, MECHANICAL DESIGN of Machine Components, 2018
Ansel C. Ugural, Youngjin Chung, Errol A. Ugural
Self-contained bearings contain the lubricant in the bearing housing, which is sealed to prevent oil loss. Oil may be gravity fed from a reservoir or cup above the bearing. Obviously, a bearing of this type is economically more desirable because it requires no expensive cooling or lubricant-circulating system. Self-contained bearings are known as pillow-block or pedestal bearings.
Detecting changes in the structural behaviour of a laboratory bridge model using the contact-point response of a passing vehicle
Published in Journal of Structural Integrity and Maintenance, 2023
Robert Corbally, Abdollah Malekjafarian
The bridge model, shown in the photographs in Figure 6 and the detailed sketches in Figure 7, consists of a 5 mm deep, 600 mm wide steel plate representing the bridge deck, with 6 no. steel angle beams (20 × 20 × 3 mm) bolted to the underside of the deck. The bridge deck spans 2 m between the supports, which were designed to allow simply-supported rotational behaviour at each end. The supports consist of a steel shaft which spans between two pillow-block bearing units and a 3D printed bearing shelf which surrounds the steel support shaft and provides a plinth to support the beams. The laboratory model was designed to represent the behaviour of a typical concrete beam and slab bridge under vehicular loading and is based on an existing bridge (shown in Figure 2). Due to the complexities of modelling the geometry of the bridge at a reduced scale, various scaling laws were employed to optimise the geometry of the cross section so that the span-deflection ratio under the load of a typical truck would remain constant, and the first natural frequency of the bridge would be in a similar range to that of the full scale bridge (the bridge length is scaled using a factor of 1:12.5). Timber approach spans were provided at each end of the bridge to allow the vehicle to accelerate/decelerate during each vehicle passage.
Model tests on piled raft subjected to lateral soil movement
Published in International Journal of Geotechnical Engineering, 2018
Ihsan Al-abboodi, Tahsin Toma Sabbagh
The lateral loading system consists of a screw jack mounted on a horizontal timber beam of (215 mm × 65 mm) cross section supported by the two vertical steel columns. The screw jack pushes a timber frame consists of an upper sheet, three side timber blocks and two loading blocks. The timber frame transfers the lateral jacking load to the loading blocks which are in a direct contact with the laminar frames causing lateral movement to these frames and to the soil inside the box. In order to induce lateral sliding to the parts of the timber loading frame as one unit, the frame was mounted from its upper timber sheet to a special sliding unit. The basic configuration of the sliding unit consists of bearing pillow block, an aluminium plate and dual shafts. The bearing blocks were bolted to two horizontal closed channel steel beams of (100 mm × 50 mm). Each one of these beams was bolted to the vertical steel column at its end and rested on the upper sliding frame at the other end. The sliding unit and the lateral frame are illustrated in Figure 3.