Foil bearings have been attracting considerable attention for their application in achieving low power consumption in small-sized turbo machines, excellent stability at high speeds, and durability at high temperature. Foil bearings with bump foils are one of the most suitable candidates for these applications as indicated in recent studies. However, it was reported that current small foil thrust bearings had insufficient load capacity to support thrust forces in practical high-speed turbo machines, and were needed to improve the load capacity at high speeds. As a first step in improving the load capacity of small foil thrust bearings, the load capacity and rotational torque of this type of foil thrust bearings that operate at up to 350,000 r/min were investigated experimentally and numerically in this paper. In the numerical calculation, the Reynolds and elasticity equations for the top foil were solved simultaneously by using the finite difference and the finite element method, respectively. It was experimentally and numerically found that the foil thrust bearings treated in this paper have the load capacity coefficient of 5.36 × 10−6 N/(mm)3 kr/min, which was comparable to that of the second-generation foil thrust bearings.
Based on conditions in the area surrounding a site, in certain cases constraints apply to the use of cranes in construction. Such cases include sites very close to a road, railway line, power transmission line, or another building, as well as sites where legal restrictions such as civil aeronautics law apply.The crane operating field control system uses an automatic tracking total station to measure in real time the position of the end of a crane's boom. The operating range of the crane is set by a computer which uses data on the real time position of the boom to determine whether it is within the safe area . The computer can set multiple and complex operating ranges as well store operational data and warning signal data, information which can be applied to future work.
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