This study surveyed the current state of mining machines dynamics. In the significant number of theoretical studies mining face was represented as a force variable in time. Such face representa-tion does not reflect physical reality, and does not include the influence of mining machines dynamic parameters and processes on face formation. This paper introduces a new dynamic model of the mining machine with an idealized damageable face, which provides kinematic excitation of the drill-ing bit while moving on its trail. In this case, the mining machine is represented as a dynamic system with a delay (a system with «memory»), where face coordinates depend on the dynamic parameters and operating modes. The proposed system was checked for stability. This study shows that stable dynamic systems «executive body» with a variable structure provide minimal target dynamic loads. Experimental study of executive bodies suspensions of the blasthole drilling rigs, coal mining and tunneling machines was conducted. Experiments showed high efficiency reduction of dynamic loads in the carrying systems in all cases.
In paper are shown the results of creation calculation algorithm and calculation main parameters for downhole electrosteamgeneratos for heat treatment of high-viscosity oil reservoirs. The example of characterization results for Usinskoye oil field.
The electrothermal complex on a basis of face electrosteam and gas generator for thermal influence on productive layers of high viscosity oil and a control system of this complex is considered. This control system allows to support automatically the set technological parameters depending on operating modes of a complex.
The basic ways of control of power, transferred to a heating element of coal-face electrothermal devices are considered. Research of influence of work of a heating element on quality of the electric power in distributing networks is carried out.
The algorithm of resonant fluctuations amplitude stabilization of dynamically counterbalanced drilling string on carrying cable with swinging movement of jackbit is developed. Imitating modeling of the resonant asynchronous electric drive with swinging movement of jackbit with the frequency converter in various operating modes is resulted.
Considered nonsymmetric mode of drill bit oscillations when forming a unipolar electromagnetic torque on each cycle oscillations of dynamically balanced drill . Developed a method for estimating speed of rotation drill around its axis when working in the nonsymmetric mode at first approximation .
To use of the autoresonant electric drive of swinging movement for creation of an oscillative motion of crushing jaws of vibrating jaw crushers it is offered in this article. The control system of the electric drive is developed. The results of imitating and physical modelling of the autoresonant electric drive are presented.
The paper proves the timeliness of obtaining and examining bottom sediments from subglacial Lake Vostok. Predictive geological section of Lake Vostok and information value of bottom sediments have been examined. Severe requirements towards environmental security of lake examinations and sampling of bottom sediments rule out the use of conventional drilling technologies, as they would pollute the lake with injection liquid from the borehole. In order to carry out sampling of bottom sediments from the subglacial lake, it is proposed to use a dynamically balanced tool string, which enables rotary drilling without any external support on borehole walls to transmit counter torque. A theoretical analysis has been carried out to assess the operation of the tool string, which is a two-mass oscillatory electromechanical system of reciprocating and rotating motion (RRM) with two degrees of freedom.