loading page

Fatigue life prediction of centrifugal fan blades in the ventilation cooling system of high-speed-train
  • +3
  • Ning He,
  • Li Tan,
  • Zi Li,
  • Tong Pang,
  • Yi Chen,
  • Cheng Yang
Ning He
Hunan University
Author Profile
Li Tan
Hunan University
Author Profile
Zi Li
Hunan University
Author Profile
Tong Pang
Hunan University
Author Profile
Yi Chen
Zhuzhou CRRC times electric co, LTD
Author Profile
Cheng Yang
Zhuzhou CRRC times electric co, LTD
Author Profile

Abstract

Centrifugal fan blades of high-speed train ventilation and cooling system are subjected to cyclic loading which will shorten the life of fan blades. It could cause an accident of high-speed-train in service. In this study, a modified method based on nominal stress method was proposed and developed for the fatigue life prediction of centrifugal fan blades. The finite element model was firstly introduced to analyze the mode and stress of fan blades based on physical material property. The fatigue life was predicted based on S-N curve, using the Miner's cumulative damage rule to calculate total damage. In order to verify the effectiveness of this method, the experimental tests based on fatigue bench system were conducted on fan blades, which were typical structure of the ventilation cooling system of high-speed-train. The damage mechanism of blades was deduced from the fracture fractographs. Relatively good correlation was achieved between the prediction model and actual experimental results, testifying the practicability and effectiveness of this proposed method. Thus, the research result could reduce the probability of accidents caused by fan blade damage and improve the reliability of ventilation cooling system of high-speed train.