scholarly journals Tooth Shape Optimization of the NGW31 Planetary Gear Based on Romax Designer

2016 ◽  
Author(s):  
Chunming Xu ◽  
Ze Liu ◽  
Wenjun Chang ◽  
Bei Li
Keyword(s):  
Shape Optimization ◽  
Planetary Gear ◽  
Tooth Shape

Stator tooth shape optimization for double salient hybrid excitation generator based on asymmetric circuit analysis

2019 ◽  
Vol 38 (6) ◽  
pp. 1738-1755 ◽  
Author(s):  
Shuchun Yao ◽  
Wei Zhang
Keyword(s):  
Shape Optimization ◽  
Optimization Scheme ◽  
Voltage Fluctuation ◽  
Tooth Shape ◽  
Content Type ◽  
Dc Voltage ◽  
Excitation Generator ◽  
Finite Element Analysis Simulation ◽  
Hybrid Excitation ◽  
The Asymmetry

Purpose This paper aims to clarify the relationship between stator tooth shape and DC voltage fluctuation of a double salient hybrid excitation generator (DSHEG). It analyzes the asymmetrical characteristics of the magnetic circuit and inductance between each phase. The study aims to reduce voltage fluctuation by using a stator shape optimization scheme, which helps reducing inductance difference. Design/methodology/approach This paper opted for a method combined with theoretical analysis, simulation and experimental verification. The stator tooth optimization scheme is given based on theoretical asymmetrical analysis and Taguchi method. A series of two-dimensional finite element analysis simulation of different conditions are conducted. Two prototypes with different stator tooth shape are made and experiments are carried out. Findings The paper provides empirical insights into how the stator tooth shape influences the asymmetry of inductance and DC voltage fluctuation. Compensation adjustments to the stator tooth shape can narrow the inductance differences of each phase. It suggests that “LTL” shaped DSHEG has lower voltage ripple than “III” shaped DSHEG without sacrificing output power. Research limitations/implications Because of the chosen research approach, the gap between magnets and stator and end effect are not considered. Errors exist between simulation and experimental results. Practical implications The paper includes implications for other “C” shaped tooth optimization. Study on phase asymmetry of the special machine can further improve quality testing and simplify control strategy. Originality/value This paper analyzes the asymmetry of DSHEG and proposes an optimized stator tooth shape to reduce DC voltage fluctuation.

scholarly journals Geometry-Based Shape Optimization to Improve Dynamical Behaivior of Planetary Gear Boxes in Aero Engines

2020 ◽  
Author(s):  
Aris Konstantinidis ◽  
◽  
Klaus Höschler ◽  
Patrick Hauk ◽  
◽  
...  
Keyword(s):  
Shape Optimization ◽  
Planetary Gear ◽  
Aero Engines

Helicopter main reduction planetary gear fault diagnosis method based on SVDD

2020 ◽  
Vol 64 (1-4) ◽  
pp. 137-145
Author(s):  
Yubin Xia ◽  
Dakai Liang ◽  
Guo Zheng ◽  
Jingling Wang ◽  
Jie Zeng
Keyword(s):  
Fault Diagnosis ◽  
Planetary Gear ◽  
Gaussian Kernel ◽  
Support Vector ◽  
Support Vector Data Description ◽  
Vector Data ◽  
Energy Characteristics ◽  
Gear Fault ◽  
Channel Information ◽  
Diagnosis Method

Aiming at the irregularity of the fault characteristics of the helicopter main reducer planetary gear, a fault diagnosis method based on support vector data description (SVDD) is proposed. The working condition of the helicopter is complex and changeable, and the fault characteristics of the planetary gear also show irregularity with the change of working conditions. It is impossible to diagnose the fault by the regularity of a single fault feature; so a method of SVDD based on Gaussian kernel function is used. By connecting the energy characteristics and fault characteristics of the helicopter main reducer running state signal and performing vector quantization, the planetary gear of the helicopter main reducer is characterized, and simultaneously couple the multi-channel information, which can accurately characterize the operational state of the planetary gear’s state.

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