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Sensitivity analysis of rolling bearing fatigue life under cyclic loading
Xianming Wang,Qingling Meng,Tianxiao Zhang 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.11
Rolling bearings are regularly subjected to cyclic loading, and the load changing sequence has a significant influence on bearing fatigue life. The study offers a cumulative fatigue damage theory based on the improved Lundberg-Palmgren method that takes into account the effect of load changing sequence on bearing fatigue life and then proposes a modified Miner bearing fatigue life model. Additionally, the state function for the bearing fatigue life analysis is developed based on the basic dynamic load rating and stress-strength interference model of the bearing. A moment-based sensitivity analysis method for bearing fatigue life is proposed for studying the influence of different variables on bearing fatigue life. Finally, a sensitivity analysis of the fatigue life of 6209 deep groove ball bearings was performed as an example. The calculation results demonstrate that the modified Miner life model is comprehensive and that the moment-based sensitivity analysis method is simple and accurate.
Shoji Ohga,Hiroaki Yoshimoto,Chandra Pokhrel,Yang, Baisong,Noriko Miyazawa,Tianxiao Meng,Shun Hosoda,Masuo Mae,Zhu Sun 충남대학교 농업과학연구소 2008 농업과학연구 Vol.35 No.2
Mycelial expansion and fruit body development of caterpillar fungi, Cordyceps sobolifera(Hill.) Berk. et Br. was examined on various carbon and nitrogen sources, some substrates with various supplements. Best temperature for the mycelial expansion was 25℃, while optimal pH was 7. Glucose and polypeptone were the best sources of carbon and nitrogen, respectively, as well as 1:1 was the best ratio of carbon and nitrogen. The unpolish rice and bean curd lees were used as core substrates combined individually with five various supplements. In substrates based, all the supplements with all combinations were found to exhibit the mycelial growth and fruit body formation. Likewise, yolk was found as a superior supplement and also clarified quite high polysaccharide content in the fruit body.
Ohga, Shoji,Yoshimoto, Hiroaki,Pokhrel, Chandra,Yang, Bai-Song,Miyazawa, Noriko,Meng, Tianxiao,Hosoda, Shun,Mae, Masuo,Sun, Zhu Institute of Agricultural Science 2008 Korean Journal of Agricultural Science Vol.35 No.2
Mycelial expansion and fruit body development of caterpillar fungi, Cordyceps sobolifera(Hill.) Berk. et Br. was examined on various carbon and nitrogen sources, some substrates with various supplements. Best temperature for the mycelial expansion was $25^{\circ}C$, while optimal pH was 7. Glucose and polypeptone were the best sources of carbon and nitrogen, respectively, as well as 1:1 was the best ratio of carbon and nitrogen. The unpolish rice and bean curd lees were used as core substrates combined individually with five various supplements. In substrates based, all the supplements with all combinations were found to exhibit the mycelial growth and fruit body formation. Likewise, yolk was found as a superior supplement and also clarified quite high polysaccharide content in the fruit body.