Manufacturing Error Effects on Mechanical Properties and Dynamic Characteristics of Rotor Parts under High Acceleration

Stress, strain and vibration characteristics of rotor parts should be changed significantly under high acceleration, manufacturing error is one of the most important reason. However, current research on this problem has not been carried out. A rotor with an acceleration of 150,000 g is considered as...

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Bibliographic Details
Published in:Chinese journal of mechanical engineering 2017-07, Vol.30 (4), p.920-932
Main Authors: Jia, Mei-Hui, Wang, Cheng-Lin, Ren, Bin
Format: Article
Language:English
Subjects:
Active control
Component reliability
Dynamic characteristics
Electrical Machines and Networks
Electronics and Microelectronics
Engineering
Engineering Thermodynamics
Equivalence
Finite element method
Heat and Mass Transfer
High acceleration
Instrumentation
Machines
Manufacturing
Mathematical analysis
Mathematical models
Mechanical Engineering
Mechanical properties
Modal analysis
Original Article
Power Electronics
Prestressing
Processes
Product design
Resonant frequencies
Slice method
Stresses
Symmetry
Theoretical and Applied Mechanics
Vibration mode
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Summary:Stress, strain and vibration characteristics of rotor parts should be changed significantly under high acceleration, manufacturing error is one of the most important reason. However, current research on this problem has not been carried out. A rotor with an acceleration of 150,000 g is considered as the objective, the effects of manufacturing errors on rotor mechanical properties and dynamic characteristics are executed by the selection of the key affecting factors. Through the force balance equation of the rotor infinitesimal unit establishment, a theoretical model of stress calculation based on slice method is proposed and established, a formula for the rotor stress at any point derives. A finite element model (FEM) of rotor with holes is established with manufacturing errors. The changes of the stresses and strains of a rotor in parallelism and symmetry errors are analyzed, which verify the validity of the theoretical model. The pre-stressing modal analysis is performed based on the aforementioned static analysis. The key dynamic characteristics are analyzed. The results demonstrated that, as the parallelism and symmetry errors increase, the equivalent stresses and strains of the rotor slowly increase linearly, the highest growth rate does not exceed 4%, the maximum change rate of natural frequency is 0.1%. The rotor vibration mode is not significantly affected. The FEM construction method of the rotor with manufacturing errors can be utilized for the quantitative research on rotor characteristics, which will assist in the active control of rotor component reliability under high acceleration.
ISSN:1000-9345
2192-8258
DOI:10.1007/s10033-017-0154-9