The application of computer facilities for solving engineering and scientific problems causes the need to develop standard algorithms, programs, information support of tasks.

In the theory of turbomachines fundamental is the question of determining the expended work on the wheel as a form of energy exchange of fluid with the body.

The fan as an energy-consuming unit should be evaluated both in design and in operation from a single position in terms of the value of the spent and useful work.

The question of sufficient conditions supplementing the necessary general criterion conditions of similarity in hydrodynamic problems is equivalent to the question of the uniqueness of the solution of the system of basic equations.

The conducted studies show that the torque of perforators is created by impulse shock loads, the maximum value of which reaches a significant.

The performance of a mine plant in transporting fluids through pipelines using machines is determined by both the individual characteristic of the machine itself and the characteristic of the external network. The individual machine characteristic reflects the internal qualities of the machine and indicates how much useful work it can transfer to the external network. ...

An important importance in the selection of hydraulic drive for mining machines is the development of more convenient methods of using the characteristics of the hydraulic drive. The main role in the transformation of speeds and torques of the hydraulic drive is assigned to two of its properties: the graphical representation of these two properties on the operational characteristics of hydraulic turbo-transmissions has been called stiffness and opacity.

Characteristics of fans are widely used in the design and operation of ventilation systems of mines and mines. Different interpretations of certain aspects of this issue have not been given much importance until now. However, now, during the transition of industrial enterprises to new principles of economic management and economic incentives, engineers have to find reserves for saving material resources and reducing production costs. At the enterprises more and more importance is attached to the issues of testing of mine fans, at the same time, and there are contradictions in the theory and interpretation of certain issues related to the evaluation of the economic efficiency of mine suction fans of main ventilation.

At mining enterprises with the use of pneumatic energy may be technically and economically advantageous to ventilate blind faces with compressed air, because for short-term ventilation or with a relatively small amount of constantly supplied air is inexpedient to supply electricity and install a partial ventilation fan ...

In mining practice, pipeline transportation of liquids and gases is becoming more and more widely used. When calculating complex air piping networks, as well as pipelines for hydraulic coal mining, it is of great importance to ensure that the consumers have a given pressure. The technical performance of the machines and the economic efficiency of the entire plant depend on this.

Mine air pipelines are called complex when the network is highly branched and has a large number of diverse consumers of compressed air. In contrast to such networks in industry, there are simple networks, when a trunk line of often constant diameter is laid from the generator, through which compressed air energy is supplied to one, two or three homogeneous consumers.

About one-fifth of the coal in the Soviet Union is mined with pneumatic jackhammers, and the mechanization of underground work in the ore industry is carried out almost exclusively with compressed air power. In addition to jackhammers and drilling hammers, a lot of various mining equipment with pneumatic drive has appeared in the face and at the site nowadays. With the wide application of shield system of coal mining at powerful steeply falling seams, as well as the system of development by horizontal layers, the number of upward workings, which are used for ventilation, coal transportation, fixing timber, etc., is sharply increasing. For sinking of such workings the air-drilling machines are more and more often used.

In mining practice, one often has to deal with the design and operation of complex air pipeline networks. Currently, there are several technical and techno-economic methods for their calculation. For practical calculations, it is more convenient to use the nomogram located at the end of the article (see article). Using this nomogram greatly simplifies the selection of a pipeline and the calculation of all network elements. The advantage of the nomogram also lies in the fact that we can easily find from it the equilibrium states in the air duct when the pressure at the beginning of the calculation section is specified, but we do not know the mutually interconnected pressure that will be established at the receiver, the air flow rate and the pressure loss at this area. It is quite obvious that now we cannot allow a free choice of the speed of air movement in the pipe; considering the issue from the point of view of minimum economic costs, we are obliged to: find an equilibrium state in which a certain pressure at the receiver, air flow and pressure losses determined by the pressure at the beginning of the element and the diameter of the pipe will be established; This problem of finding an equilibrium state in a pipeline is solved using a nomogram through several samples.