Vadim Mokšin

Investigation of quality change in locomotive lubricant

This paper describes experimental investigation of lubricant properties used in locomotive engines. The workbench for experimental investigation is described, and experiment technique is presented. Results and their interpretation show direction for further investigation. Conclusions of results are made.

An Investigation Into Fault Diagnosis in a Rotor-Bearing System with Dampers Used in Centrifugal Milk Separators

This paper deals with the problems encountered in the fault diagnosis in damped rotorbearing systems used in centrifugal milk separators. It is shown that direct bearing vibration measurements are more reliable than indirect (through rotor housing) vibration measurements. However, in most cases it is not possible to measure bearing vibrations directly. The factors causing large diagnostic measurement errors, such as the influence of the vibration damping system, step-up gear and electric motor noise are discussed in the paper. It is established that vibration measurements of the damping system are noninformative and cannot be used to diagnose faults in bearings. It is proposed to use the vibration spectra correlation to predict bearing failures in rotor-bearing systems of this type.

FEM Investigation of Load Carrying Capacity of Magnetic Vibration Isolating Supports

The load carrying capacity of self-centering permanent magnet based vibration isolating support is analyzed in the article. COMSOL Multiphysics® modeling software was used for numerical simulation. Results are presented as repulsion force versus support cap displacement graph as well as magnetic flux density distribution graphs. Repulsion force was also measured experimentally. It is established that differences between numerically and experimentally obtained values are only about 2–8%. It is also established that near-zero stiffness of the support is achieved in case of 70 N normal load force.

Selection of the Nozzle for Metal Surface Cleaning Using Cavitating Pulsing Fluid Flow

The aim of the research was to define an appropriate design of the nozzle which could be used to cavitate microbubbles and direct the cavitating water flow on the cleaning metal surface. Three different nozzles were evaluated. SolidWorks 2011 Flow Simulation software was used for calculations. Volume of vacuum bubbles in the flowing part of the nozzle was established. The water pressure at the inlet was varied from 4 to 10 MPa. Calculations show that in all nozzle structures amount of bubbles change slightly while pressure is varied from 4 to 10 MPa, so the optimal pressure of the water flow can be considered as 4 MPa.

Tribological Behavior of Aerosol Particles in Acoustic Field

This work investigates agglomeration process of aerosol particles in presence of acoustic field. It is shown that besides orthokinetic and hydrodynamic interaction mechanisms, tribological interaction occurs in presence of acoustic field. This interaction depends on dynamic viscosity of the gas mixture above the liquid surface. The influence of acoustic field on tribological interaction between the aerosol particles was investigated both numerically and experimentally. The obtained results show the positive influence of acoustic field on agglomeration of aerosol particles.

Investigation of aluminum surface cleaning using cavitating fluid flow

This paper investigates efficiency of specially designed atomizer used to spray water and cavitate microbubbles in water flow. Surface cleaning system was used to clean machined (grinded) aluminum surface from abrasive particles. It is established that cleaning efficiency depends on diameter of the diffuser, water pressure and distance between nozzle and metal surface. It is obtained that the best cleaning efficiency (100%) is achieved at pressure 36 bar, when diameter of diffuser is 0.4 mm and distance between nozzle and surface is 1 mm. It is also established that satisfactory cleaning efficiency (80%) is achieved not only when atomizer is placed closer to metal surface, but also at larger (120 mm) distances.

Investigation of properties of lubricants in locomotive diesels

Abstract This paper describes experimental investigation of lubricant properties used in locomotive engines. The workbench for experimental investigation is described, which presented theoretical background and technique of the experiment. The results are analyzed and presented graphically. Their interpretation shows the direction for further investigation. Final conclusions of the results are made.