Experimental investigation of the stability of a clearance‐excited rotor system with optimal parameters

The response of a flexible rotor mounted in six bearing sets has been experimentally determined. One set of axial groove bearings and five sets of pressure dam bearings were tested. Conventional synchronous tracking was used in the analysis and other techniques utilizing an FFT analyzer were developed. The stability of the system was seen to strongly depend on the design of the step bearings. The dam bearings were also noted to lock into subsynchronous whip during deceleration after the system went unstable. The response of the system with varying degrees of unbalance is also analyzed and several structural resonances of the rotor system are discussed.

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Experimental investigation of parameters affecting the stability of articulated concrete block mattress under wave attack

Applied Ocean Research ◽

10.1016/j.apor.2017.03.003 ◽

2017 ◽

Vol 64 ◽

pp. 184-202 ◽

Cited By ~ 11

Author(s):

O. Aminoroayaie Yamini ◽

M.R. Kavianpour ◽

S. Hooman Mousavi

Keyword(s):

Experimental Investigation ◽

Concrete Block ◽

The Stability

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Experimental investigation on the stability and heat transfer enhancement of modified mircoencapsulated phase change materials and latent functionally thermal fluids

Journal of Energy Storage ◽

10.1016/j.est.2021.102846 ◽

2021 ◽

Vol 41 ◽

pp. 102846

Author(s):

Peixing Du ◽

Changhui Liu ◽

Bin Fang ◽

Bohao Chen ◽

Ziyan Li ◽

...

Keyword(s):

Heat Transfer ◽

Experimental Investigation ◽

Phase Change ◽

Heat Transfer Enhancement ◽

Phase Change Materials ◽

Transfer Enhancement ◽

Thermal Fluids ◽

The Stability

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The Influence of Mn3+ on the Stability Relations of the Al2Si05 Polymorphs with Special Emphasis on Manganian Andalusites (Viridines), Formula: An Experimental Investigation

Journal of Petrology ◽

10.1093/petrology/24.1.48 ◽

1983 ◽

Vol 24 (1) ◽

pp. 48-75 ◽

Cited By ~ 9

Author(s):

I. ABS-WURMBACH ◽

K. LANGER ◽

W. SCHREYER

Keyword(s):

Experimental Investigation ◽

The Stability

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Analytical and Experimental Investigation of the Stability of the Rotor-Bearing System of a New Small Turbocharger

Volume 2: Aircraft Engine; Marine; Microturbines and Small Turbomachinery ◽

10.1115/87-gt-110 ◽

1987 ◽

Cited By ~ 14

Author(s):

H. R. Born

Keyword(s):

Experimental Investigation ◽

Dynamic Stability ◽

Squeeze Film ◽

Test Results ◽

Flow Capacity ◽

Squeeze Film Dampers ◽

Rotor Bearing ◽

The Stability ◽

Turbine Design ◽

Bearing System

This paper presents an overview of the development of a reliable bearing system for a new line of small turbochargers where the bearing system has to be compatible with a new compressor and turbine design. The first part demonstrates how the increased weight of the turbine, due to a 40 % increase in flow capacity, influences the dynamic stability of the rotor-bearing system. The second part shows how stability can be improved by optimizing important floating ring parameters and by applying different bearing designs, such as profiled bore bearings supported on squeeze film dampers. Test results and stability analyses are included as well as the criteria which led to the decision to choose a squeeze film backed symmetrical 3-lobe bearing for this new turbocharger design.

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EFFECT OF FRICTION ON VIBRATIONAL CHARACTERISTICS OF ROTOR SYSTEM DURING ROTOR-STATOR INTERACTION

10.15593/2224-9982/2020.61.03 ◽

2020 ◽

pp. 22-31

Author(s):

Anton Kurakin ◽

Keyword(s):

Experimental Data ◽

Experimental Investigation ◽

Friction Coefficient ◽

Rotor System ◽

Aluminum Bronze ◽

Rotor Systems ◽

Vibrational Characteristics ◽

Rotor Stator Interaction ◽

Intermediate Value ◽

Impact Motion

Systems operation which include rotating elements in certain cases is associated with occurrence of contact between the rotating parts (rotor) and the stationary parts (stator). There were cases then rotor-stator interaction led to damage or to complete unit destruction. For this reason, rotor-stator interaction is one of the main problem of rotor systems exploitation. The main aim of the work is to gather detail data about effect of friction on vibrational characteristics of rotor system during rotor-stator interaction. In this article the experimental investigation method and experimental investigation of dynamic behavior of rotor during rotor-stator interaction is presented. The analysis of experimental data obtained during interaction between steel rotor and stator made of aluminum, bronze and PTFE is presented. All results with rotor-stator contact and without were compared by using Campbell diagrams, orbits and frequency responses. Analysis of experimental data shows that friction has strong effect on vibrational characteristics of rotor system during rotor-stator interaction. According to friction ratio three kinds of vibrational characteristics of rotor system are distinguished: forward slipping if friction coefficient is small, backward rolling if friction coefficient is big, vibratory impact motion if friction coefficient has intermediate value. Created experimental method and gathered data about rotor dynamics during rotor-stator contact can be used for verification and tuning of mathematical models.

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