Annotation This paper discusses the development of a mathematical model for the constant speed drive, comprising the power supply of an aircraft power grid. The model is developed in the form of equations of dynamics of the drive main components, such as differential, volumetric hydraulic transmission, centrifugal regulator, auxiliary pumps, as well as using the AMESim calculation package. The model has been verified using experimental data of the AC frequency responses of the existing unit to various influences. The models obtained allow to conclude about the stability of the system, and to optimize the control system parameters.

No abstract

The work is devoted to the finding of the formula for calculating the optimal speed of the centrifugal pump. The structure, applications and main types of this vertical tank and its advantages in comparison to the horizontal tank are described. The figuring out of the formula is based on the conditions of maximum pump efficiency and it allows us to quickly assess the degree of non optimality of the pump when its operating frequency differs from the optimal frequency.

The paper gives a derivation of the formula for calculating the predicted resource of the most loaded bearing of a horizontal centrifugal pump. A model of a horizontal centrifugal pump, as well as the action of axial forces and radial reactions, are considered.

There is a wide range of rotor rotational frequencies and cavitation cavitatin margins used in the industrial centrifugal pumps. The effect of these parameters on the dimensions criteria and cavitation characteristics of a pump is studied in this paper, the Sobol method is proposed for it and the task is to find the minimum number of point sat which the best ratio of the parameters will be achieved.