Search results

Filters

  • Journals
  • Authors
  • Keywords
  • Date
  • Type

Search results

Number of results: 2
items per page: 25 50 75
Sort by:
Download PDF Download RIS Download Bibtex

Abstract

Pure-tone audiometry (PTA) and transient-evoked otoacoustic emissions (TEOAEs) were determined in 57 classical orchestral musicians along with a questionnaire inquiry using a modified Amsterdam Inventory for Auditory Disability and Handicap ((m)AIADH). Data on musicians' working experience and sound pressure levels produced by various groups of instruments were also collected. Measured hearing threshold levels (HTLs) were compared with the theoretical predictions calculated according to ISO 1999:1990. High frequency notched audiograms typical for noise-induced hearing loss were found in 28% of the subjects. PTA and TEOAE consistently showed a tendency toward better hearing in females vs. males, younger vs. older subjects, and lower- vs. higher-exposed to orchestral noise subjects. Audiometric HTLs were better than theoretical predictions in the frequency range of 2000-4000 Hz. The (m)AIADH scores indicated some hearing difficulties in relation to intelligibility in noisy environment in 26% of the players. Our results indicated a need to implement a hearing conservation program for this professional group.

Go to article

Authors and Affiliations

Małgorzata Pawlaczyk-Łuszczyńska
Adam Dudarewicz
Małgorzata Zamojska
Mariola Śliwińska-Kowalska
Download PDF Download RIS Download Bibtex

Abstract

To improve the durability of the rollers of supporting and guiding devices as well as traction ropes of ropeway facilities based upon the analysis of their contact interaction. Theoretical studies of a mathematical model of contact interaction of mine ropeway components to determine regularities of the formation of dynamic efforts within the contact area and experimental studies of the plant under mine conditions. Based upon a mathematical model, contact stresses within the zone of contact of traction rope with guiding rollers and drive sheaves of mine ropeways under real operating conditions have been determined. The obtained results are validated experimentally under mine conditions. Innovative patent-protected design solutions have been proposed; the solutions make it possible to considerably increase the durability of the ropeway components.
It has been determined that methods of surface increase in the strengthening of a roller working surface do not have proper effect as the strengthened layer on a soft base cracks and delaminates due to high contact loads; maximum angle of rope bending on rollers of supporting devices (6º – in operation manual; 15º – in safety rules) recommended for GRW is overstated. It shouldn’t be more than 1.5º in terms of values of contact stresses for standard plants; development of prestressed compression state in the material of elastic lining of a drive friction sheave allows increasing considerably (by two times and more) its service life. Ropes with reduced diameters of external layer wires (Ukraine’s regulatory document – DST 2688) being used currently on mine ropeways do not meet the operating conditions and have a short period of service life due to their corrosive and fatigue breaking. To lengthen the service life of GRW traction ropes, it is required to change for the ropes with increased diameters of the external layer wires with preliminarily clamped strands.
(Ukraines regulatory documents: DST 3077, DST 3081, DST 7668, DST 7669 and TU 14-4-1070).
Go to article

Bibliography

[1] O. Denyshchenko, L. Posunko, A. Shyrin, M. Kechin, Increase in the Efficiency of Ground Cableways in the Process of Zonal Development Working. Collection of research papers of National Mining University 46, 159-168 (2015).
[2] V . Rastsvetaev, Additional Loads on Tunnel Arch Supports Under the Action of Overhead Monorail in the Western Donbas Mines. Heotekhnichna Mekhanika 117, 53-59 (2014).
[3] A. Shyrin, V. Rastsvetaev, T. Morozova, Estimation of Reliability and Capacity of Auxiliary Vehicles While Preparing Coal Reserves for Stoping. Geomechanical Processes during Underground Mining: School of Underground Mining 105-108 (2012).
[4] A. Dryzhenko, A. Shustov, S. Moldabayev, Justification of parameters of building inclined trenches using belt conveyors. 17th International Multidisciplinary Scientific GeoConference SGEM 17, 471-478 (2017). DOI: https://doi.org/10.5593/sgem2017/13/S03.060
[5] O. Denyshchenko, A. Shyrin, V. Rastsvietaiev, O. Cherniaiev. Forming the Structure of Automated System to Control Ground Heavy-Type Ropeways. Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu 4, 79-85 (2018). DOI: https://doi.org/10.29202/nvngu/2018-4/12
[6] R.P. Singh, M. Mallick, M.K. Verma, Studies on failure behaviour of wire rope used in underground coal mines. Engineering Failure Analysis 70, 290-304 (2016). DOI: https://doi.org/10.1016/j.engfailanal.2016.09.002
[7] S. Moradi, K. Ranjbar, H. Makvandi, Failure Analysis of a Drilling Wire Rope. Journal of Failure Analysis and Prevention 12 (5), 558-566 (2012). DOI: https://doi.org/10.1007/s11668-012-9596-7
[8] Shaiful Rizam Shamsudin, Mohd Harun, Mazlee Mohd Noor & Azmi Rahmat. Failure Analysis of Crane Wire Rope. Materials Science Forum 819, 467-472 (2015). DOI: https://doi.org/10.4028/www.scientific.net/MSF.819.467
[9] А.N. Koptovets, L.N. Shyrin, E.М. Shliakhov, А.V. Denishchenko, V.V. Zil, V.V. Yavorskaia, Modeling operating processes in shoe and wheel brake of mine locomotives. Monografiya. Dnepr: National Mining University 258 (2017).
[10] V.А. Korotkov, Wear-resistance of machines. Moskva: Direkt-Media (2014).
[11] V .D. Goncharov, D.V. Pershina, Optimization of surface microrelief to improve adhesive strength of surface and base. Modern Technologies In Engineering 8, 79-87 (2013).
[12] K .I. Kozorezov, N.F. Skogorova, Steel strengthening by means of shock waves. Physics and Chemistry of Metalworking. 2, 99-105 (2015).
[13] S.V. Razorionov, G.V. Garkushin, Strengthening of metals and alloys in terms of shock compression. Journal of Technical Physics 85 (7), 77-82 (2015).
[14] P.А. Gavrish, Ye.V. Berezhnaia, Ye.А. Sobolev-Butovchenko, Thermal spraying of antifriction coating of the components of Takraf loading elevator. Scientific messenger of Donbass State Engineering Academy 2 (20Е), 50-54 (2016).
[15] D.А.Volchenko, А.V. Voznyi, О.B. Stadnyk, V.S. Vetvitskii, On the problem of using dynamic models of disc-shoe brakes of transportation vehicles in drives of handling facilities. Problems of Friction and Wearing 2 (75), 24-36 (2017).
[16] М.P. Martyntsiv, B.V. Solohub, М.V. Matiyishyn, Dynamics and reliability of cableway systems. Lviv: Editing house of Lviv Polytecnic (2011).
[17] D . Kolosov, O. Dolgov, A. Kolosov, Analytical determination of stress-strain state of rope caused by the transmission of the drive drum traction. Progressive Technologies of Coal, Coalbed Methane, and Ores Mining, 499-504 (2014). DOI: https://doi.org/10.1201/b17547
Go to article

Authors and Affiliations

Jamil Sami Haddad
1
ORCID: ORCID
Oleksandr Denyshchenko
2
ORCID: ORCID
Dmytro Kolosov
2
ORCID: ORCID
Stanislav Bartashevskyi
2
ORCID: ORCID
Valerii Rastsvietaiev
2
ORCID: ORCID
Oleksii Cherniaiev
2
ORCID: ORCID

  1. Al-Balqa Applied University, 1 Al-Balqa Applied University, Jordan
  2. Dnipro University of Technology, Ukraine

This page uses 'cookies'. Learn more