The leading role in development of the industry of Ukraine is played by a fuel and energy complex. Functioning and development of a fuel and energy complex of Ukraine are largely predetermined by a condition and development of the coal industry, which widespread in our region.
In the common complex of flow processes of collieries the important place is occupied by transport and lifting which is made by hoisting engines and whipes.
Mine hoisting engines are intended for the equipment of mine elevating installations of vertical and inclined trunks of the pits used for migration of elevating vessels at lifting of minerals and muck, descent-lifting of people, materials, the equipment, audit and trunk survey, mounting and change elevating and balancing ropes.
According to destination of installation, it is discriminated: the main things (for mineral lifting, and also
muck on a surface); auxiliary (for lifting and descent of people and various cargoes); the cutting (at passing pit trunks) and inspection or emergency (for audit of a trunk and lifting of people in emergencies). On an equilibration of mass of lift wires: system unbalanced, statically equilibrated and dynamically equilibrated. As organs of coiling of a lift wire: with fixed radius of coiling (cylindrical drums, friction cones) and with variable radius of coiling. On hoisting engines electric motors by power to 5000 kw and more are applied. Alternating current induction motors were extended on skipping hoisting engines power to 1800-2000 kw and on êëåòåâûõ, power to 800-1000 kw. At lifting high powers electric motors of direct current are usually used
The given installations are widely applied to conveyance of people, muck, materials and the equipment. By means of observed installations coal is carried also.
At lifting of cargoes technically the maximum speed, as a rule, to 20 km/s also is economically rational, at lifting of people - to 12 km/s.
Dynamics of a filament of variable length is presented in G.N. Savin`s and Goroshko`s work.
M.V.Petrov in his work: “The Dynamic equation of miner lifting with an asynchronous dual-motor drive”, has presented a dynamic equation of miner lifting for the common case, and also has gained a dynamic equation of statically unbalanced miner lifting with the double-motor asynchronous electric drive. The given equations are inferred for a section of a stage of deceleration. According to the given work M.V.Petrov has come to the conclusion and said, that regularity of deceleration of miner lifting with the double-motor induction motor drive generally operations of both propellers on one shaft do not depend on a power conditions, except for a regime of a free running out of statically equilibrated lifting. Parameters of the equations depend on an operating mode only.
The regime of a free running out of statically equilibrated lifting is presented by a second-kind equation.
Calculating works of mine elevating installations were carried aut dy G.M. Yalanchik. He is the author of many works on mine transport. The given works have been published still in 1941.
He prosecuted such subjects, as sampling of the optimal parameters of designed mine elevating installation, etc.
By dynamics of ropes were occupied V.I. Dvornikov and A.V. Zhurba in the
work: ”Dynamic forces in head ropes of the multirope elevating installations at skip loading”. In the given work the dynamic loading in loading of freely hanging skip is observed, considering, that this loading is the most intensive and demanding special attention. “It is enough to tell, that the huge mass of coal or the muck, attaining 35 ò within several seconds is overthrown from altitude of 10-15 m in a body of a loaded vessel to fathom, how much considerable dynamic loads are tested by a rope during this period of a duty cycle of elevating installation.” - it is said in the work.
Dynamics of a rope is observed also in V.I. Dvornikova other works, and also in M.J.Konstantinova`s, N.I.Rastorasova`s works, etc.
With development of scientific and technical advance the great value was acquired by hoisting engines and whipes used in the mine industry.
From all mountain-mine equipment elevating installations take a special place as are the principal kind of transport linking drifts of pit with a day surface.
For calculation of mine lift wire ropes a wide circulation so-called static method of calculation is used. This method consists in that the rope is calculated on a simple extension as the homogeneous rod subjected only to act of a body weight and weight of end cargo. To consider the influence of other forces, it is accepted heightened safety factor. It is supposed, that this store covers all force explicated in a rope, both static, and dynamic. Magnitude of this store is installed roughly and consequently unsatisfactorily reflects the real processes proceeding in a rope.
Owing to heightened safety factor a diameter of a rope, sizes of cones, drums are augmented, etc.It is required the greater power, engine.
Hence the importance of the dynamic theory of a mine lift wire is cleared.
The founder of the dynamic approach to the theory of calculation of lift wires is a prominant Soviet scientist A.N. Dinnik.
Except he the given problem was occupied by:
G.N. Savin, O.A. Goroshko, V.N. Shavelo, V.I. Dvornikov, G.M. Elanchik, V.B. Umansky, E.A. Prohodtseva, M.M. Fedorov, M.F. Petrov, etc.
On the above stated, the work theme is actual.
The purpose the present work is lowering of dynamic forces in a mine lift wire and raise of its longevity.
For reaching of the above-stated purpose the following problems are put:
1. To execute literature survey
2. To familiarise with Works of authors which dealt with the given problem
3. To make mathematical model of a hoisting engine
4. To work out the canonical equations and own shapes of oscillations
5. To solve these equations, having defined force in all boundary cross-sections of a rope.
6. To develop the basic device with the impulse neutralizer of oscillations.