Rotor Trajectories in Fluid-Film Bearings, Adjustment of Them and Energy Efficiency Parameters

Leonid Savin,Denis Shutin,Alexander Babin,Sergey Mayorov,D Zhang,H Ding,B Zi,G Cui

doi:10.1051/matecconf/20167701017

Leonid Savin, Denis Shutin + Show 6 more

Open Access

https://doi.org/10.1051/matecconf/20167701017

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Abstract

The problem of rotor machines modification requires development of new approaches to the design of specific nodes. As bearings are considered the most important elements of rotor machines, such approaches can imply the application of active control. In the present paper using the example of fluid-film bearings the approach is considered to enchancing energy efficiency of rotor machines by means of generating optimal trajectories. Means are shown to analyze the dynamics of a rotor system and types of the obtained trajectories. The paper also covers the approach to setting the criteria of energy efficiency of rotor’s trajectories. After the optimal trajectory is obtained, active bearings are proved feasible to control the displacement of a rotor by generating a force to match the actual trajectory to the calculated one, and by this to decrease the energy loss.

Highlights

Increasing competitiveness of a machine is closely linked to the necessity of increasing their performance and decreasing size and cost at the same time
Under the conditions of high revolution frequencies and dynamic loads on the most vital parts of the machine, it seems only perspective to set the rotor on the fluid-film bearings [1,2,3,4,5]
The provision on vibrational reliability is by all means one of the main operability criteria, as it defines both the stress acting in the rotor and the dynamic load on the supporting nodes, as well as the load transferred to the housing of the machine

Summary

Introduction

Increasing competitiveness of a machine is closely linked to the necessity of increasing their performance and decreasing size and cost at the same time. In terms of transport or technological turbomachinery, e.g. compressors, pumps, expanders, this fact requires increasing the rotational frequencies of rotors [1]. Under the conditions of high revolution frequencies and dynamic loads on the most vital parts of the machine, it seems only perspective to set the rotor on the fluid-film bearings [1,2,3,4,5]. The provision on vibrational reliability is by all means one of the main operability criteria, as it defines both the stress acting in the rotor and the dynamic load on the supporting nodes, as well as the load transferred to the housing of the machine

Nonlinear rotor dynamics problems

Types of trajectories

Enegry Efficiency Parameters

A A rot disp dis dis t*

Rotor Trajectories Correction

Conclusion