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Tensile Forces in Lift Carrier Ropes Exerted by the Fluid Pressure

Hrabovský Leopold

Advances in Science and Technology. Research Journal

2019

Vol. 13, no 3

31--37

This paper describes the methodology by which it is possible to compare different tensile forces that are caused by the uneven distribution of loads in carrier ropes of lifts. In order to compare the applied tensile forces in a certain number of carrier ropes, it is possible to use the device called “rope hydraulic tension compensator”, when, for example, building new elevators, changing carrier ropes during renovations or servicing existing lifts. The comparison of tensile forces in lift carrier ropes by the described device is based on the method of liquid pressure diffusion in a closed vessel. The rope hydraulic tension compensator consists of a number of structural parts, the main of which are double-acting hydraulic cylinders. The number of these cylinders is equal to the number of carrier ropes of the given lift. The pressure of the hydraulic fluid, which is supplied to the inner shell of individual hydraulic cylinders, controls the length of extension of individual piston rods of the hydraulic cylinders. The position of the piston in each of the hydraulic cylinders is directly proportional to the length of the extended piston rod, which corresponds to compression of the cylindrical coiled spring, above which the respective hydraulic cylinder is located. Different compressions of individual cylindrical springs exert different magnitude of tensile forces in suspension eye-bolts, into whose longitudinal axes the total load size is distributed unevenly. The paper also describes the description and hydraulic circuit diagram of a hydraulic power unit, which is used to control the piston positions of two-way hydraulic cylinders.

Flow a couple-stress fluid through an annular curvilinear channel with one semi-porous wall

Jurczak P., Walicka A., Walicki E., Michalski D.

International Journal of Applied Mechanics and Engineering

2005

Vol. 10, no spec

11-18

The flow of a couple -stress fluid in an annular curvilinear channel with a porous insert is considered. The porous insert is connected with a inner impermeable rotating surface which approaches the outer fixed surface of an annular curvilinear channel. The equations of motion governing of the flow reduce to the coupled Reynolds and Poisson equations which can be uncoupled by using the Morgan-Cameron approximation and closed-form solution can be obtained. Expressions for the pressure distribution in a channel clearance are given. As an example the flow through the channel modelled by two concentric spherical surfaces is discussed.