Received 26.01.2023, Revised 01.01.1970, Accepted 15.06.2023

Displacement compensators for the skylines of timber transportation cableways

Ihor Rudko, Borys Bakay, Ihor Karatnyk, Volodymyr Gobela, Ivan Radiak

Cableways for timber transportation are quite effective in terms of manufacturability, specific energy consumption, material capacity and the negative impact level on the environment in difficult natural operating conditions, compared to similar types of machines. Since non-stationary cableways are usually used in forestry production, which are characterized by a light construction with relatively small safety margins of cable equipment elements, then for this type of roads, the reliability and safety of the skylines work are important factors for their effective operation. In order to reduce the cost and duration of installation and dismantling operations, the skylines are usually rigidly fixed to trees, stumps or artificial supports. Such a cable fastening scheme is technically convenient, but it does not allow for constant tension of the skylines when the carriage with the load is moving along the span, under wind load, possible temperature fluctuations, icing of structural elements, and emergency situations. As a result, intensive changes in cable tension during their operation cause dynamic loads and vibrations in the cable rigging, as well as uneven and accelerated wear of the skylines, and a decrease in their durability. Under such conditions, in order to increase the reliability of the cable rigging of timber transportation cableways (both individual existing models of equipment and the latest ones), it is proposed to equip them with displacement compensators for the skylines. After analyzing a number of prototype devices that are effectively used in related industries, it was concluded that pneumatic, mechanical, and hydraulic compensator designs can be considered rational for timber production. Therefore, in view of the above, we performed a detailed calculation and designed the main technical elements of the compensating device, developed a control scheme for its working body, and analyzed its stressstrain state using the Autodesk Inventor software package. The use of rational compensator designs and appropriate control schemes for their working bodies will create the prerequisites for reliable and safe operation of timber transportation cableways in various operating modes and terrain and climatic conditions, and minimize the likelihood of emergencies

compensating device, tension stabilization, skyline, cableway, timber transportation
121-128
Rudko, I., Bakay, B., Karatnyk, I., Gobela, V., & Radiak, I. (2023). Displacement compensators for the skylines of timber transportation cableways . Journal of Mechanical Engineering and Transport, 9(1), 121-128. https://doi.org/10.31649/2413-4503-2023-17-1-121-128

References

[1] Birda, M., & Borz, S.A. (2012). A comparison between tractor based and skyline based mechanized systems for timber logging. Bulletin of the Transilvania University of Brasov, Series II: Forestry, Wood Industry, Agricultural Food Engineering, 5(1), 19-24.

[2] Rudko, I M. (2015). The need and prerequisites for the introduction of logging technologies with the use of ropeways for forestry purposes. Scientific Bulletin of the National Forestry University of Ukraine: A Collection of Scientific and Technical Works, 25(9), 233-239. doi: 10.15421/40250937.

[3] Cavalli, R. (2012). Prospects of research on cable logging in forest engineering community. Croatian Journal of Forest Engineering: Journal for Theory and Application of Forestry Engineering, 33(2), 339-356.

[4] Matiishyn, M.V., Martyntsiv, M.P., & Rudko, I.M. (2003). Increasing the reliability of cable timber transport systems. Problems of Tribology: An International Scientific Journal, 1, 44-47.

[5] Martyntsiv, M.P., Sologub, B.V., & Matiishyn. M. V. (2011). Dynamics and reliability of suspended rope systems. Lviv: Publication of Lviv Polytechnic University.

[6] Martyntsiv, M.P., & Rudko, I.M. (2013). Peculiarities of multi-criteria optimization of the main parameters of suspended cable forest transport installations. Scientific Bulletin of the National Forestry University of Ukraine: A Collection of Scientific and Technical Works, 23(15), 108-115.

[7] Martyntsiv, M.P., Tysovskyi, L.O., Boratynskyi, O.V., & Rudko, I.M. (2002). Analysis of the operation of a rope-type forest transport installation as a complex system. Scientific Bulletin: A Collection of Scientific and Technical Works, 12(8), 107-111.

[8] Turianskyi, R.I. (2013). Analysis of structural features of assembly and disassembly equipment of suspended cable forest transport systems and methods of its calculation. Scientific Bulletin of NLTU of Ukraine, 23(17), 150-157.

[9] Marchi, L., Grigolato, S., Mologni, O., Scotta, R., Cavalli, R., & Montecchio, L. (2018). State of the art on the use of trees as supports and anchors in forest operations. Forests, 9(8), article number 467. doi: 10.3390/f9080467.

[10] Tysovskyi, L.O., & Rudko, I.M. (2004). Modeling of the work of ropes of suspended transport installations. In Modern problems of mechanics: All-Ukrainian science conference (pp. 49-50). Lviv: Lviv Polytechnic University.

[11] Mologni, O., Marchi, L., Lyons, C.K., Grigolato, S., Cavalli, R., & Röser, D. (2021). Skyline tensile forces in cable logging: Field observations vs software calculations. Croatian Journal of Forest Engineering, 42(2), 227-243. doi:10.5552/crojfe.2021.722.

[12] Dupire, S., Bourrier, F., & Berger, F. (2016). Predicting load path and tensile forces during cable yarding operations on steep terrain. Journal of Forest Research, 21(1), 1-14. doi: 10.1007/s10310-015-0503-4.

[13] Rudko, I.M., & Barylyak, V.V. (2017). Design of compensators for suspended cable lifting and transportation installations. In Applied scientific and technical research: Materials of international science and practice conference (p. 47). Ivano-Frankivsk: Symphony forte. doi: 10.5281/zenodo.7003894.

[14] Rudko, I., Horzov, S., Bakay, B., & Gobela, V. (2022). Design of compensating device for the cable logging system. Scientific Collection “InterConf”, 50, 433-438.

[15] Shcherban, V. Y., Murza, N.I., Kyrychenko, A.M., Kolysco, O.Z., & Sholudko, M.I. (2017). Tension compensator. (Patent of Ukraine No. 117290). Retrieved from https://iprop-ua.com/?qi=117290.

[16] Kuzminskyi, V.P., & Rudchyk, O.S. (2003). Cable tension compensator.  (Patent of Ukraine No. 60560). Retrieved from https://iprop-ua.com/?qi=60560.

[17] Hrabovskyi, L. (2019). Tensile forces in lift carrier ropes exerted by the fluid pressure. Advances in Science and Technology Research Journal, 13(3), 31-37. doi:10.12913/22998624/110050.

[18] Jian, L., & Yuan-Xiang, L. (2012). Multi-rope hoist steel rope tension on-line monitoring system. In National conference on information technology and computer science (CITCS 2012) (pp. 229-232). Lunzhou: Atlantis Press.

[19] Paraska, G.B. (2012). Stabilization of warp thread tension on knitting machines. Khmelnytskyi: KhNU.

[20] Baryliak, V.V., Rudko, I.M., & Bychyniuk, I.V. (2012). Tension compensator of the carrying rope of the timber transport installation. (Patent of Ukraine No. 73489).

[21] Song, Di, Xu, G.-Y., Lei, G.-Y., Zhang, X.-G., & Tian, B.-L. (2019). Research on dynamic characteristics and compensation of wire rope tension and load measurement based on hydraulic connection device. Shock and Vibration, 2019, article number 809242. doi: 10.1155/2019/3809242.

[22] Lei, G., Xu, G., Zhang, X., & Tian, B. (2019). Study on dynamic characteristics and compensation of wire rope tension based on oil pressure sensor. Advances in Mechanical Engineering, 11(3). doi: 10.1177/1687814019836024.

[23] Rudko, I.M. (2006). The influence of temperature changes on the strength and geometric characteristics of the load-bearing rope of the suspended transport installation. Bulletin of the Khmelnytskyi National University, 6(87), 48-52.

[24] Dell, T.W. (2023). Hydraulic systems for mobile equipment (2nd ed.). Illinois: The Goodheart-Willcox Company.