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Research of Dynamic Balancing of Flexible Rotor and Rotor Dynamic Characteristic

Author: SuYueJun
Tutor: WenBangChun；LiHe
School: Northeastern University
Course: Mechanical and Electronic Engineering
Keywords: Flexible rotors Balancing Influence coefficient method. Finite element method
CLC: TH113
Type: Master's thesis
Year: 2008
Downloads: 337
Quote: 0
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Abstract


The rotating member is widely used in gas turbines, aircraft engines, industrial compressors and motors and other mechanical devices. Electricity, aviation, machinery, chemical, textile and other sectors of the national economy plays a very important role. Due to the vibration of the rotor, resulting in a lot of unnecessary loss of engineering, and one of the main reasons for imbalance is caused by vibration and noise, but also directly affect the performance and service life of the equipment. Therefore, the study Rotor Balancing has important theoretical significance and practical value. In this paper, the air conditioning compressor rotor flexible rotor balancing and dynamic characteristics of engineering background. First introduced how to create a finite element model of the air-conditioning compressor rotor, and how to use the test means to extract the quality attributes of the stator, as well as how to calculate the magnetic field stiffness of the more in-depth study, which laid the foundation for the establishment of a reasonable finite element model ; Second, to the establishment of a rotor finite element model is reasonable, theoretical analysis and calculation of the rotor model, Bently rotor test stand trial, and the rotor model was calculated by MSC.Nastran finite element software seen from the results of the calculation of the theoretical value, the test value and the finite element software, three results are very close, so that the mutual authentication results Credits, using finite element means to study the rotor dynamics; describes the the rotor balancing commonly used in two ways: the modal balance method and the influence coefficient method, and the air conditioning compressor rotor studied in this paper illustrates Why should I use the influence coefficient method; Finally, for air-conditioning compressors machine rotor studied by means of the balancing process, the use of finite element here rotor balancing process is based on the numerical simulation of rotor dynamics finite element method and the influence coefficient method. The air conditioning compressor rotor system is composed by a flexible rotating part of the rotor and the non-rotating part of the stator, which are fixed in the suspension. Fixed on the bearing of the rotary portion is rotated at a constant speed is assumed here that the unbalanced mass calculated relatively accurately, such as the crankshaft, which can be more accurate calculation of the excitation force. For the rotor of the compressor, this study showed that the balancing of the rotor on the target surface can be reduced vibration level of the rotor, rotor vibration level not only reduce friction between the rotor and the stator can be avoided, but also can be reduced by the rotor The vibration transmitted to the stator. The research done mainly based on the theory of rotor dynamics and finite element based on the feasibility of the results also need to verify the reasonableness of the trial, but the results of this paper provide test a certain reference value specified direction can be applied directly to the actual industrial production.

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CLC: > Industrial Technology > Machinery and Instrument Industry > Mechanics (mechanical design of the basic theory ) > Mechanical kinetics
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