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About 551 papers for “Rotordynamics”

Rotordynamics

Muszynska, Agnieszka. · TU Digital Collections (Thammasat University) · 2005

Cited by 0

Rotordynamics

Schutzenhofer, L. A. · NASA STI Repository (National Aeronautics and Space Administration)

Research activities that can ultimately lead to optimum rotordynamics design for the space shuttle main engine are outlined. Achievements are summarized in: (1) improving analysis and simulation techniques; (2) defining forces which result from the rotor and surroundings; (3) determining the effect of rubbing; (4) improving balancing; (5) developing damping methods, i.e., eddy-current and damping seals; (6) establishing methods to quantify internal friction; and (7) developing supporting test apparatus.

Cited by 0Open access

Robust rotordynamics

Rix, Andrew Iain James · Nottingham ePrints (University of Nottingham) · 2016

Vibration generated from main rotor unbalance has a major impact on the aerospace gas turbine industry. A combination of logistical and technological drivers differentiate aerospace gas turbines and their derivatives from other types of gas turbines with respect to the approach for managing vibration, leading to a bespoke approach for the design, build, and balancing. The key drivers are: limited accessibility to rotors within the engine, the requirement for exchangeable modules (sub-assemblies) of major parts of the rotor without rebalancing, the use of only low-speed balancing on pseudo-rigid rotors with bladed assemblies, very low vibration limits leading to very tight balancing limits, extreme weight limits for design solutions, and the need for highly accurate, repeatable, and stable rotor joints. This study proposes and demonstrates a novel and rapid robust design system that has been created to deal with these unique challenges. The system comprises an overarching process and a set of novel tools and methods that have been created to support the process. These tools comprise an Unbalance Response Function (URF) design method that effectively delivers a preliminary design assessment and a fast Monte-Carlo simulation and comparison method with supporting software for comparing and improving build and balance design solutions. The aim of the overall process is to generate a system that identifies and controls critical parameters, and alleviates time wasted controlling non-critical parameters. The target outcome is therefore the most cost effective, predictable and repeatable solution with respect to rotor generated vibration (i.e. robust). Two novel methods of informing and improving the outcome of the low-speed balancing process using extra information available about the rotor are also introduced.

Cited by 0

Non-Linear Rotordynamics

Non-linear Rotordynamics, G.B. Thomas, Lower Lobes · 1997

This report describes the development of non-linear methods for the modelling of problems such as steam whirl, shaft cracking and severe unbalance in the dynamics of rotating machines. The shaft and foundation models used for linear rotordynamics are suitable, but the solution method is changed to time-stepping. The program WHIRL is described together with examples of its output. 1 Notation A 1 ; A 2 ; A 3 ; A 4 Oil Film Stiffness coefficients A 1 ; B 2 ; B 3 ; B 4 Oil Film Damping coefficients dc Diametral Clearance E 1 ; E 2 Eccentricity ratio of upper and lower lobes E x ; E y Initial eccentricity ratio ec x ; ec y Horizontal & Vertical Eccentricity ratios f x ; f y Transverse forces F u ; F v Transverse forces rotating axes F Array of transverse forces,various suffices ~ f force vector G Moments about X & Y axes h Step length i x ; i y array elements of oilH & oilV K 1 ; K 2 Stiffness submatrices K;K d Mean and difference stiffness matrices K 1 ; K 2 ; K 3 ; K 4 Stiffne...

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Review of Rotordynamics

Sawicki, Jerzy T. · EngagedScholarship @ Cleveland State University (Cleveland State University) · 2007

Book Review of Rotordynamics, by Agnieszka (Agnes) Muszynska. CRC Press, Taylor & Francis Group, Boca Raton, FL, 2005, 1128 pp., ISBN: 0-8247-2399-6

Cited by 0Open access

Lectures on rotordynamics

Alessandro Vigliani · PORTO Publications Open Repository TOrino (Politecnico di Torino) · 2010

Cited by 0

Damper bearing rotordynamics

D. Elrod · NASA STI Repository (National Aeronautics and Space Administration) · 1990

High side loads reduce the life of the Space Shuttle Main Engine (SSME) High Pressure Oxygen Turbopump (HPOTP) bearings. High stiffness damper seals were recommended to reduce the loads on the pump and turbine end bearings in the HPOTP. The seals designed for use on the pump end are expected to adequately reduce the bearing loads; the predicted performance of the planned turbine end seal is marginal. An alternative to the suggested turbine end seal design is a damper bearing with radial holes from the pressurized center of the turbopump rotor, feeding a smooth land region between two rough-stator/smooth-rotor annular seals. An analysis was prepared to predict the leakage and rotor dynamic coefficients (stiffness, damping, and added mass) of the damper bearing. Governing equations of the seal analysis modified to model the damper bearing; differences between the upstream conditions of the damper bearing and a typical annular seal; prediction of the damper bearing analysis; and assumptions of the analysis which require further investigation are described.

Cited by 0Open access

Introduction to Pump Rotordynamics

Andres, Luis S. · Defense Technical Information Center (DTIC) · 2006

The lecture introduces the basic problems in the rotordynamics of turbomachinery, excessive vibration and instability. The acceptable performance of a turbomachine depends on the adequate design and operation of the bearing and seal elements supporting a rotor. Descriptions of the basic principles of lubrication follow with details on the operation of hydrodynamic and hydrostatic lubricated bearings and seals. The differences among these elements are highlighted with a brief account on their effects on rotordynamics. The basic equations for the modeling of linear rotor-bearing systems are given along with an example for the rotordynamics of a multiple stage compressor. Pump rotordynamics is introduced noting the major difference with other rotating systems, i.e. hydraulic side loads, static and dynamic, due to pressure changes in the volute and flow conditions in an impeller, dynamic forces from seals neck ring and interstage and balance pistons, and impeller-rotor interaction forces. Accounting for the action of these elements is of importance to adequately predict the performance and troubleshoot the rotordynamics of high performance pumps. An example of rotordynamic analysis of a multiple-stage liquid pump stresses the differences between wet and dry predictions, i.e. operation with and without the pumping liquid.

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