Failure factors of the vessel-armor systems in complex geological conditions of vertical shafts
The factors causing instability of dynamic processes in the mine hoisting installations are determined. It is shown that considered processes can lead to a significant reduction in the safety of systems Vessel-Armor of vertical shafts. It is determined that the angular deviation of lifting vessel a...
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| Format: | Article |
| Language: | English |
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Perm National Research Polytechnic University
2015-12-01
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| Series: | Perm Journal of Petroleum and Mining Engineering |
| Subjects: | |
| Online Access: | http://vestnik.pstu.ru/get/_res/fs/file.pdf/5007/Failure+factors+of+the+vessel-armor+systems+in+complex+geological+conditions+of+vertical+shaftsfile.pdf |
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| author | Vladimir I. Samusia Sergei R. Iliin Inna S. Iliina Svetlana S. Iliina |
| author_facet | Vladimir I. Samusia Sergei R. Iliin Inna S. Iliina Svetlana S. Iliina |
| author_sort | Vladimir I. Samusia |
| collection | DOAJ |
| description | The factors causing instability of dynamic processes in the mine hoisting installations are determined. It is shown that considered processes can lead to a significant reduction in the safety of systems Vessel-Armor of vertical shafts.
It is determined that the angular deviation of lifting vessel axis from vertical caused by curved profile of conductors and/or horizontal movement from the center of cargo gravity in a vessel leads to dynamic influence of vertical oscillations of head cable on the horizontal oscillations of lifting vessel in armor.
Intensification of the vertical oscillations of the cable leads to synchronic stimulation of angular oscillations of the lifting vessel in the kinematic gaps between conductors and drive shoe safety with transition to beat-cyclic mode of loading and armor of the vessel. The sources of stimulation of the vertical oscillations cables of ascending and descending installation branches in operating and braking mode.
It is shown that in the lifting apparatus with multiple cables that has friction pulley dynamic forces in ascending branch transmit harmonic perturbations with frequency of oscillations of lifting vessel to the top ends of cable. It happens due to the frictional interaction with brickwork. As a result of superposition of such perturbations with its own oscillations of lowering vessel on every single cycle of lifting in certain shaft interval, where frequencies of each branches are close in the lowering branch, short increase in vertical oscillations of lowering vessel and its horizontal pitch with beats on armor are observed.
It is shown that the elasticity of the drive hoisting machine causes appearance of interconnectedness of the vertical oscillations of lifting and lowering branches cables. During such effect in shaft interval, where natural frequencies of the two installation branches are close in value in a short time there is an intensive change in the amplitude of the vertical oscillations of both vessels, which is a source of stimulation of blast stresses on the armor.
It was determined that on the interval of change of linear speed of the lifting installation at work and safety braking modes there is highest intensification of vertical cable oscillations. Wherein, horizontal stress on armor can significantly exceed the level of stress under the above described dynamic forces.
The influence of profile curvature on the level of occurring dynamic forces on armor is studied. The graphical diagram illustrating causal link between the level of strength capacity of conductors and executions, the level of wear, profile curvature of conductors and the contact forces is presented. It is recommended to reduce risks of operating emergency of armor by reducing the contact stresses in the working mode and the safety brake of the elevator installation. |
| first_indexed | 2024-12-11T05:55:36Z |
| format | Article |
| id | doaj.art-c017f849346344a093f94febb9c95d55 |
| institution | Directory Open Access Journal |
| issn | 2224-9923 2305-1140 |
| language | English |
| last_indexed | 2024-12-11T05:55:36Z |
| publishDate | 2015-12-01 |
| publisher | Perm National Research Polytechnic University |
| record_format | Article |
| series | Perm Journal of Petroleum and Mining Engineering |
| spelling | doaj.art-c017f849346344a093f94febb9c95d552022-12-22T01:18:40ZengPerm National Research Polytechnic UniversityPerm Journal of Petroleum and Mining Engineering2224-99232305-11402015-12-011417728010.15593/2224-9923/2015.17.8Failure factors of the vessel-armor systems in complex geological conditions of vertical shaftsVladimir I. Samusia0Sergei R. Iliin1Inna S. Iliina2Svetlana S. Iliina3National Mining University of UkraineNational Mining University of UkraineNational Mining University of UkraineNational Mining University of UkraineThe factors causing instability of dynamic processes in the mine hoisting installations are determined. It is shown that considered processes can lead to a significant reduction in the safety of systems Vessel-Armor of vertical shafts. It is determined that the angular deviation of lifting vessel axis from vertical caused by curved profile of conductors and/or horizontal movement from the center of cargo gravity in a vessel leads to dynamic influence of vertical oscillations of head cable on the horizontal oscillations of lifting vessel in armor. Intensification of the vertical oscillations of the cable leads to synchronic stimulation of angular oscillations of the lifting vessel in the kinematic gaps between conductors and drive shoe safety with transition to beat-cyclic mode of loading and armor of the vessel. The sources of stimulation of the vertical oscillations cables of ascending and descending installation branches in operating and braking mode. It is shown that in the lifting apparatus with multiple cables that has friction pulley dynamic forces in ascending branch transmit harmonic perturbations with frequency of oscillations of lifting vessel to the top ends of cable. It happens due to the frictional interaction with brickwork. As a result of superposition of such perturbations with its own oscillations of lowering vessel on every single cycle of lifting in certain shaft interval, where frequencies of each branches are close in the lowering branch, short increase in vertical oscillations of lowering vessel and its horizontal pitch with beats on armor are observed. It is shown that the elasticity of the drive hoisting machine causes appearance of interconnectedness of the vertical oscillations of lifting and lowering branches cables. During such effect in shaft interval, where natural frequencies of the two installation branches are close in value in a short time there is an intensive change in the amplitude of the vertical oscillations of both vessels, which is a source of stimulation of blast stresses on the armor. It was determined that on the interval of change of linear speed of the lifting installation at work and safety braking modes there is highest intensification of vertical cable oscillations. Wherein, horizontal stress on armor can significantly exceed the level of stress under the above described dynamic forces. The influence of profile curvature on the level of occurring dynamic forces on armor is studied. The graphical diagram illustrating causal link between the level of strength capacity of conductors and executions, the level of wear, profile curvature of conductors and the contact forces is presented. It is recommended to reduce risks of operating emergency of armor by reducing the contact stresses in the working mode and the safety brake of the elevator installation.http://vestnik.pstu.ru/get/_res/fs/file.pdf/5007/Failure+factors+of+the+vessel-armor+systems+in+complex+geological+conditions+of+vertical+shaftsfile.pdfmining shaftgunboatcagemining shaft armordynamics of mining lifting installationssystem Vessel-Armorsafety pitchbox conductor |
| spellingShingle | Vladimir I. Samusia Sergei R. Iliin Inna S. Iliina Svetlana S. Iliina Failure factors of the vessel-armor systems in complex geological conditions of vertical shafts Perm Journal of Petroleum and Mining Engineering mining shaft gunboat cage mining shaft armor dynamics of mining lifting installations system Vessel-Armor safety pitch box conductor |
| title | Failure factors of the vessel-armor systems in complex geological conditions of vertical shafts |
| title_full | Failure factors of the vessel-armor systems in complex geological conditions of vertical shafts |
| title_fullStr | Failure factors of the vessel-armor systems in complex geological conditions of vertical shafts |
| title_full_unstemmed | Failure factors of the vessel-armor systems in complex geological conditions of vertical shafts |
| title_short | Failure factors of the vessel-armor systems in complex geological conditions of vertical shafts |
| title_sort | failure factors of the vessel armor systems in complex geological conditions of vertical shafts |
| topic | mining shaft gunboat cage mining shaft armor dynamics of mining lifting installations system Vessel-Armor safety pitch box conductor |
| url | http://vestnik.pstu.ru/get/_res/fs/file.pdf/5007/Failure+factors+of+the+vessel-armor+systems+in+complex+geological+conditions+of+vertical+shaftsfile.pdf |
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