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He Q.,Tsinghua University | Luo Y.,Tsinghua University | Wang Z.,Tsinghua University | Wu J.,TOSHIBA Hydro Power Hangzhou Co. | Chen L.,TOSHIBA Hydro Power Hangzhou Co.
Shuili Fadian Xuebao/Journal of Hydroelectric Engineering | Year: 2010

National standard fatigue experiments were conducted and simulated in this paper based on the total life theory and the measured S-N curve of practical material to validate the credibility and accuracy of numerical method for fatigue life prediction. Factors that may lead to errors were analyzed. The warranted numerical methods were used for fatigue analysis of the rotor center part in a bulb unit. Operations under the rated and runaway conditions and the corresponding start-stop processes were simulated. The commonly used mean stress correction was also validated. In the validation experiments, the maximum error at the testing points in the validated stress range was 6.58%. In the practical cases, the major cause of fatigue damage is frequent start-stop running rather than stable operation. © Copyright. Source


Wang H.,Hunan Electric Power Test and Research Institute | Mo J.,Hunan Electric Power Test and Research Institute | Tian H.,Hunan Electric Power Test and Research Institute | Zhang B.,Dongping Hydraulic Power Plan | And 5 more authors.
Shuili Fadian Xuebao/Journal of Hydroelectric Engineering | Year: 2010

Since its start of operation, the Dongping hydropower station has suffered from serious abnormal vibrations and impact noises in the high-load and low-load modes, which is a threat to the safety, reliability and efficiency of the units, and even to the safety of the plant and dam. To identify the causes and alleviate this problem, the power plant, pump testing agency and manufacturer carried out an experimental study and through a combined condition optimization they succeeded in mitigating these vibrations and noises in some of the load conditions. This shows that combined optimization is an effective mean to improve the stability of bulb-type hydro generating set. This paper summarizes the main results and provides a reference for the research in this field. © Copyright. Source


Luo Y.,Tsinghua University | Wang Z.,Tsinghua University | Chen L.,TOSHIBA Hydro Power Hangzhou Co. | Wu J.,TOSHIBA Hydro Power Hangzhou Co.
Advances in Mechanical Engineering | Year: 2013

The rotor bracket is a key component of the generator rotor with cracks in the rotor bracket leading to rubbing between the rotor and stator, which threatens safe operation of the unit. The rotor rim is so complicated that the equivalent radial stiffness of rim was determined by numerical simulation other than engineering experience. A comprehensive numerical method including finite element analyses and the contact method for multibody dynamics has been used to design the split rotor bracket. The com-putational results showed that cracks would occur in the initial design of the bracket when the turbine operated at the runaway speed, and the bracket design should be improved. The improved design of the bracket was strong enough to avoid cracks and rub between the rotor and stator. This design experience will help improve the design of split rotor brackets for bulb turbine generators. © 2013 Yongyao Luo et al. Source

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