Abstract
This paper presents the results of forced wear simulation of the friction lift guide rails. The forced wear in the case discussed is an effect of plastic strain of the guide rail surface due to emergency braking of the lift. For the purpose of qualitative and quantitative assessment of wear, the authors applied the numerical simulation of a stray magnetic field. Application of this method allowed evaluating the degree of wear based on the stray field changes. Application of this simulation method allowed obtaining satisfactory results of qualitative and quantitative assessment of the guide rail wear. The intention of this paper was to prove that the permanent magnetic field and the stray field can be applied for the efficient detection of the steel guide rail damages and to verify the possibility of making the quantitative assessment related to the guide rail wear degree versus the personal lift service life.
Highlights
Monitoring the technical condition of facilities is broadly described in the worldwide literature.This process aims at evaluating their further operation and at increasing safety and preventing unscheduled downtime, which directly affects the economic result.Currently, all technical facilities are subject to monitoring and the older ones used in industry are being adapted to the changing regulations
The electromagnetic field distribution in any 3D space is determined by four Maxwell formulas
It turns out from Equation (31) describing the rotation of vector {Hm } and from the differential identity rot( gradφ) ≡ 0 that the magnetic field intensity Hm may be determined by the scalar function gradient
Summary
Monitoring the technical condition of facilities is broadly described in the worldwide literature. The authors proposed the application of visual systems that can be used for the lifting wire rope quality and wear degree analysis through measurement of their diameters and significant parameters of the wire rope lay These systems enable detecting the surface damages and their type with an accuracy that is much higher than those of other methods being applied, which in turn is related to the increased level of their safety of use. A significant problem that they pointed out referred to theoretical nature of such computations being in isolation from the real operational loading of the object They presented their own equipment solutions that enabled measuring the actual operational and energetic parameters of lifts, and at the same time, they proposed their own method procedure for the determination (computation) of the energetic effectiveness of the lifts
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