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Dynamic Study of Single and Dual Rotor with Rub-impact Fault

Author: LuoHaiTao
Tutor: HanQingKai
School: Northeastern University
Course: Mechanical and Electronic Engineering
Keywords: rotor system nonlinear finite element rub-impact fault study on the experi-ment
CLC: TH165.3
Type: Master's thesis
Year: 2009
Downloads: 83
Quote: 0
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Abstract


Rotating machinery usually means the mechanical equipment with rotational parts,which mainly include turboengine, generator, motor, aeroengine and so on. These equipments have formed the basic ones of production activity in human society. It is broadly applied in the field of electric power industry, petrochemical industry, metallurgy, machinery, and aerospace industry. Along with the progress of science and technology and development of modern in-dustry, rotating machinery is now going towards the tendency of large scale and high speed, integration and automation, which greatly increases work productivity and accelerates the course of mankind civilization. But the tendency will also induce grave consequences in economy and society if severe fault of the machinery happens. In recent years, great tragedy caused by the malfunction of rotating machinery occurs frequently. So to satisfy the require-ment of fault diagnose, it’s very necessary to thoroughly study the dynamics of rotating ma-chinery with malfunction.The paper mainly studyed rub-impact fault of single and dual rotor system, which is gen-erally made of a elasticshaft with supported by two bearings at ends and lump mass at the midspan of shaft. And do some correlative experiment by means of experimental equipment in the lab.The main works are as follows:(1) Introduce the purpose and meaning of studying on this paper, offer internal and overseas investigative situations of rotor system with rub-impact fault.(2) Introduce the basic theory of finite element method, offer how to caculate the critical speed and transient response of rotor system.(3) Introduce the basic theory of rotor with rub-impact. Establish the mechanical model and finite element model of single-span rotor system with rub-impact. The dynamic proper-ties of it are studied by nonlinear finite element method under the rub-impact conditions. In-vestigate the influence on rub-impact at fixed point regarding to changeable parameters. And, analyze the stability and bifurcation of analytic solution with periodic motion. (4) Build kinetic differential equation and finite element model of dual-span rotor sys-tem. Through MATLAB and ANSYS software, we can carry out modal analysis, and show that the result is reasonable. On that basis, analyze amplitude and shaft centre plot of rotor with rub-impact at fixed point according to different clearance, stiffness and friction coeffi-cient.(5) Apply rotor experimental platform, eZ-analyst V5.1.71 collection and test analysis system and the rub-impact set in the lab, and doing the experiments of the rub-impact at a fixed point of the single rotor system, we gain correlative experiment conclusion by means of experimental data, and vertify the simulation results.

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CLC: > Industrial Technology > Machinery and Instrument Industry > Machinery Manufacturing Technology > Flexible manufacturing systems and flexible manufacturing cell > Fault diagnosis and maintenance
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