2 edition of Influence of rubbing on rotor dynamics found in the catalog.
Influence of rubbing on rotor dynamics
|Statement||by Agnes Muszynska ... [et al.].|
|Series||NASA-CR -- 183648/pt.1-2., NASA contractor report -- NASA CR-183648.|
|Contributions||Muszyńska, Agnieszka., United States. National Aeronautics and Space Administration.|
|The Physical Object|
Bent ley Rotor Dynamics Research Corporation Minden, Nevada , U.S.A. This paper presents results from experimental and analytical studies on rotor-to-stationary element partial rubbings at several locations and their effects on rotor dynamic responses. The mathematical model of a rubbing rotor is given. The computer programFile Size: KB. of the rotor tip seal leads to the rubbing of a honeycomb in take-off conditions and the leakage flow increases in the cruise conditions. The aim of this study is to compare two honeycomb seal configurations of low pressure gas turbine rotor. In the first configuration the gap is small and a rubbing takes place. In the second the fins of the File Size: 1MB.
In order to investigate the mechanism of a rotor system with unbalance and blade-casing rubbing coupling faults, the vibration and rub force in a rotor system resulting from unbalance and blade-casing rubbing coupling faults are simulated. At first, a dynamic model of form rotor is established, and a blade-casing model, which considered blade number, clearance between the blade tip and. DYNAMICSOFROTORWITHRUBBING Therefore,it canbeassumedthatthemulti-mode modal model (Eq. (5)) of the rotor consists of n concentrated masses supported onelastic massless shaft. contact radial load, f, and nonlinear tangential friction load,ff,whichare related as Rub-impact Model Thekinematics ofthe rub-impact model is shown in Fig. 1. |t is postulatedthatin thecase ofcontact of .
Influence of alignment on the moment angle stiffness that couples bull gear and pinion dynamics. From T. Cable, L. San Andres, K. Wygant, On the predicted effect of angular misalignment on the performance of oil lubricated thrust collars in integrally geared compressors, ASME J. . The failure occurred frequently when rubbing, especially when the rotating machinery worked in abnormal conditions. The research of friction coefficient on rubbing behavior was not much. The model of rubbing rotor system was established. The rubbing characteristics of the different friction coefficient were compared and analyzed. The results showed the friction coefficient had no effect on Author: Changliang Tang, Jinfu Yang, Dongjiang Han, Huan Lei, Long Hao, Tianyu Zhang.
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Get this from a library. Influence of rubbing on rotor dynamics: final report. [Agnieszka Muszyńska; United States. National Aeronautics and Space Administration.;]. This chapter introduces the friction dynamics and fault diagnosis methods of rotor systems that have rub-impact between rotor and stator.
It starts by presenting the influence of rub-impact between rotor and stator (as one of the common problems with rotating machinery) on work efficiency and safety, and introducing the mechanism and models of rub-impact.
Influence of rubbing on rotor dynamics final report. Influence of rubbing on rotor dynamics book, Nev: Bently Nevada Corporation. MLA Citation. Muszyńska, Agnieszka. and United States. National Aeronautics and Space Administration. Influence of rubbing on rotor dynamics [microform]: final report / by Agnes Muszynska [et al.] Bently Nevada Corporation Minden, Nev Rotor-stator rubs make the rotor system strongly non-linear, which gives phenomena that are not seen for ordinary : John Isaksson.
The paper shows that the dynamics of bladed rotors differs from the dynamics of rubbing circular rotors. If a bladed rotor is used it is essential to study a model with blades. Otherwise the general conclusions on the dynamics can be wrong.
For the studied rotor, failure due to high stresses will occur at driving frequencies below 50% of the natural frequency and instability at 80% of the natural frequency.
The paper shows that the dynamics of bladed rotors differs from the dynamics of rubbing circular rotors. If a bladed rotor is used it is essential to study a model with blades.
Abstract. In this chapter, the influence of cross-coupling effects on the rubbing-related dynamics of rotor/stator systems is investigated. The model considered in this chapter is a four-dof rotor/stator system, which takes into account the dynamics of the stator and the deformation on the contact surface as well as the cross-coupling by: 2.
A nonlinear finite element model for simulating the effects of rubbing and impact on rotor dynamics has been developed. The nonlinear model is used to conduct a series of forced transient analyses of a rotating system under the influence of rubbing and impact using the modal and the average acceleration direct numerical integration by: 1.
Rotordynamics advances simple yet adequate models of rotordynamic problems and phenomena related to rotor operation in its environment. Based on Dr. Muszy(n´)ska's extensive work at Bently Rotor Dynamics Research Corporation, world renowned for innovative and groundbreaking experiments in the field, this book provides realistic models, step-by.
influence to the vibration of the rubbing rotor system and both contribute a lot to the vibration characteristics of the rub-impact rotor system. As shown in Fig(a), the rub-impact motion excited only by the eccentric mass keeps synchronous with period-one for the whole calculating rotating speed Size: 3MB.
This study is concerned with investigating the influence of lateral disk flexibility on the dynamics of a rotor system experiencing rub. A rotating, flexible continuous disk/shaft model was developed and the dynamical behavior of this system with and without rubbing was by: 2. For the analysis of the influence of rotor’s radial rub-impact on imbalance responses, a full-degree-of-freedom dynamic model of a Jeffcott rotor is established using Lagrangian equation.
And also, a comprehensive case is considered here that the rotor is subjected to both unbalanced force and unbalanced moment, between which the phase angle difference is taken to be by: 9.
The results of analytical and experimental research on rotor-to-stationary element rubbing in rotating machines are presented. A characterization of physical phenomena associated with rubbing, as well as a literature survey on the subject of rub is given.
The experimental results were obtained from two rubbing rotor rigs: one, which dynamically simulates the space shuttle main engine high. CiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): The Society shall not be responsible for statements or opinions advanced in papers or discussion at meetings of the Society or of its Divisions or Sections, or printed in its publications.
Discussion is printed only lithe paper is pub-lished in an ASME Journal. Papers are available from ASME for 15 months after the. Rotor dynamic behavior depends considerably on how much the specific physical phenomena accompanying rotor rubbing against the stator is involved.
The experimental results of rotor-to-stator rubbing contact are analyzed. The computer code is described for obtaining numerical calculations of rotor-to-stator rubbing system dynamic responses. This book presents the proceedings of the 9th IFToMM International Conference on Rotor Dynamics.
This conference is a premier global event that brings together specialists from the university and industry sectors worldwide in order to promote the exchange of knowledge, ideas, and information on the latest developments and applied technologies in the dynamics of rotating machinery.
rotor are of the greatest concern. Most often, they represent the lowest modes of the entire machine structure. Next, through the supporting bearings and through the fluid encircling the rotor (unless the rotor operates in vacuum), the rotor lateral vibrations are. An extensive investigation of influence of rub grooves on dynamics and stability of the rotor, which is subjected to aerodynamic forcing associated with the leakage flow through 44 straight.
Influence of eccentricity. The exciting forces induced by the mass imbalance are major source of rotor vibrations in field, so it is necessary to analyze the effect of eccentricity on the motion characteristics of the rub-impact rotor system with fractional order by: A dynamic model of a double-disk rub-impact rotor-bearing system with rubbing fault is established.
The dynamic differential equation of the system is solved by combining the numerical integration method with MATLAB. And the influence of rotor speed, disc eccentricity, and stator stiffness on the response of the rotor-bearing system is analyzed. In the rotor system, the time history diagram Author: Youfeng Zhu, Zibo Wang, Qiang Wang, Xinhua Liu, Hongyu Zang, Liang Wang.
Dr. JOHN M. VANCE was professor of mechanical engineering at Texas A&M University, retiring in He received his PhD () degree from The University of Texas at Austin. His book Rotordynamics of Turbomachinery (Wiley) has sold more than 3, copies and is used by turbomachinery engineers around the world.
He is an inventor on several patents relating to rotating machinery and vibration.The Third Revised And Enlarged Edition Of The Book Presents An In-Depth Study Of The Dynamic Behaviour Of Rotating And Reciprocating Machinery.
It Evolved Out Of Lectures Delivered At Different Universities Over The Last Two Decades. The Book Deals With Torsional And Bending Vibrations Of Rotors, Stability Aspects, Balancing And Condition Monitoring/5(6).Rubbing is one of the most common and significant faults that exist in the rotor system.
It exhibits extremely complicated dynamic behavior. Existing dynamic models are primarily based on the symmetrical rotor structure, in which the oil film forces at both ends of support are considered identical.
However, in practice, the oil film force may be differently affected by multiple factors (e.g Author: Youfu Tang, Feng Lin, Qian Zou.