Ukrainian Journal of Mechanical Engineering and Materials Science. – 2018. – Vol. 4, No. 1

Permanent URI for this collectionhttps://ena.lpnu.ua/handle/ntb/44113

Науковий журнал

Засновник і видавець Національний університет «Львівська політехніка». Виходить двічі на рік з 2015 року.

Ukrainian Journal of Mechanical Engineering and Materials Science = Український журнал із машинобудування і матеріалознавства : науковий журнал / Lviv Politechnic National University ; editor-in-chief Oleksiy Lanets. – Lviv, 2018. – Volume 4, number 1. – 174 p. : il.

Ukrainian Journal of Mechanical Engineering and Materials Science

Зміст (том 4, № 1)

1. Cheylyakh Y. Regulation of the phase-structural composition and metastability of austenite by alloying elements and parameters of tempering for increase wear-resistance of Fe-Cr-Mn deposited steel	1
2. Student M., Veselivska G., Gvozdeckii V., Golovchuk M., Dzyubyk L., Sirak Y. Corrosion-mechanical resistance of arc-sprayed coatings made from cored powders	12
3. Dolinska I., Palash R. Method for calculating the operating life of a steam pipe with a creep-fatigue crack near a weld joint	21
4. Trush V., Luk’yanenko A. Kinetics of high-temperature interaction of titanium alloys with a carbon-containing gaseous medium	29
5. Bilous O., Mahura B. Application of wear-resistant coating by electrospark alloying method using an eutectic electrode material	40
6. Student M., Pokhmurska H., Zadorozhna K., Dzyubyk A., Khomych I. Structure and wear resistance of aluminium alloys coated with surface layer laser-modified by silicon carbide	49
7. Bondarenko M., Antonyuk V., Kovalenko Y., Rud M., Haidash R. Research of volt-ampere characteristics of the wire pierce electron gun at electron-beam microprocessing of dielectrics	58
8. Andrukhiv A., Sokil B., Sokil M. Resonant phenomena of elastic bodies that perform bending and torsion vibrations	65
9. Diveyev B. Semi-active vibration absorbers for the high-rise objects	74
10. Vorobyov M., Prokopenko D. Hydraulic pump based on the rolamite mechanism	105
11. Slipchuk A., Kuk A. Evaluation of the permissible moment in a roller cone drill bit providing the prescribed reliability of work	116
12. Malashchenko V., Strilets O., Strilets V. Theoretical foundations for the development of experimental equipment for determining the load capacity of speed change devices	125
13. Hashchuk P., Pelo R. Optimal gear shift algorithm in the car transmission during its deceleration	131
14. Royko Y., Hrytsun O., Bura R. Choose of optimal regimes of traffic light control in operating zone of pedestrian crossing	144
15. Hashchuk P., Nikipchuk S. Heat generation and heat consumption in engine of rapid internal combustion	160

Content (Vol. 4, No 1)

1. Cheylyakh Y. Regulation of the phase-structural composition and metastability of austenite by alloying elements and parameters of tempering for increase wear-resistance of Fe-Cr-Mn deposited steel	1
2. Student M., Veselivska G., Gvozdeckii V., Golovchuk M., Dzyubyk L., Sirak Y. Corrosion-mechanical resistance of arc-sprayed coatings made from cored powders	12
3. Dolinska I., Palash R. Method for calculating the operating life of a steam pipe with a creep-fatigue crack near a weld joint	21
4. Trush V., Luk’yanenko A. Kinetics of high-temperature interaction of titanium alloys with a carbon-containing gaseous medium	29
5. Bilous O., Mahura B. Application of wear-resistant coating by electrospark alloying method using an eutectic electrode material	40
6. Student M., Pokhmurska H., Zadorozhna K., Dzyubyk A., Khomych I. Structure and wear resistance of aluminium alloys coated with surface layer laser-modified by silicon carbide	49
7. Bondarenko M., Antonyuk V., Kovalenko Y., Rud M., Haidash R. Research of volt-ampere characteristics of the wire pierce electron gun at electron-beam microprocessing of dielectrics	58
8. Andrukhiv A., Sokil B., Sokil M. Resonant phenomena of elastic bodies that perform bending and torsion vibrations	65
9. Diveyev B. Semi-active vibration absorbers for the high-rise objects	74
10. Vorobyov M., Prokopenko D. Hydraulic pump based on the rolamite mechanism	105
11. Slipchuk A., Kuk A. Evaluation of the permissible moment in a roller cone drill bit providing the prescribed reliability of work	116
12. Malashchenko V., Strilets O., Strilets V. Theoretical foundations for the development of experimental equipment for determining the load capacity of speed change devices	125
13. Hashchuk P., Pelo R. Optimal gear shift algorithm in the car transmission during its deceleration	131
14. Royko Y., Hrytsun O., Bura R. Choose of optimal regimes of traffic light control in operating zone of pedestrian crossing	144
15. Hashchuk P., Nikipchuk S. Heat generation and heat consumption in engine of rapid internal combustion	160

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Semi-active vibration absorbers for the high-rise objects
(Lviv Politechnic Publishing House, 2018-01-29) Diveyev, Bohdan; Lviv Polytechnic National University
To determine the optimal parameters of the dynamic vibration absorber (DVA), a complete multi-parameter model of the dynamics of machines and structures is required. A model with two degrees of freedom is unacceptable for a sufficiently precise calculation with sufficient accuracy of the oscillations of the design, and thus for an adequate description of its dynamic characteristics. Therefore, in practice, it is necessary to investigate the design using a complex model. In particular, the methods for determining the concentration of mass and stiffness can be used on the basis of a refined theoretical calculation. A number of numerical schemes (NS) are known for complex vibro-loaded structures, in which developed methods of decomposition and synthesis of NS based on new methods of modal synthesis. Also developed is a complex NS of discrete-continuum type, which provides an opportunity in the adaptive mode to calculate stresses not only in the continuum elements, but also in the places of their greatest concentration - in the compounds. In this paper, an efficient numerical approach based on the theoretical-experimental method is proposed to maximize the minimal damping of modes in a prescribed frequency range for general viscous tuned-mass systems. Methods of decomposition and numerical synthesis are considered on the basis of the adaptive schemes. The influence of dynamic vibration absorbers and basic design elastic and damping properties is under discussion. A technique is developed to give the optimal DVA’s for the elimination of excessive vibration in sinusoidal and impact forced tall buildings system. One task of this work is to analyze parameters identification of the dynamic vibration absorber and the basic structure. The discrete-continue models of machines dynamics of some elongated element with multi mass DVA’s are offered. A technique is developed to give the optimal DVA’s for the elimination of excessive vibration in harmonic stochastic and impact loaded systems. The questions of robustness at optimization of DVA are considered. Different types of control management for semi-active DVA’s are applied. Examples of DVA’s practical implementation are presented.

Ukrainian Journal of Mechanical Engineering and Materials Science. – 2018. – Vol. 4, No. 1

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