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RISS 인기검색어
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- 저자 : Zhiping Zhai (검색결과 3 건)
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Zhiping Zhai,Donghai Yuan,Yuezheng Lan,Haixu Zhao 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.10
During the operation of a forage crusher, the common issues usually faced are shorter mean time between failures and low reliability. The hammer rotor, a critical component, is prone to fatigue fracture, hammer wear, violent vibration of the rotor system caused by uneven wear of the hammers, and other issues that reduce the machine's service life and reliability. In order to avoid failure modes within the design life of the forage crusher and improve its reliability, the functional functions of the fatigue fracture failure, hammer wear failure, and resonance failure modes were established, the marginal distribution functions for each individual failure mode were computed, and the reliability model of the hammer rotor under multiple failure modes is constructed based on the correlation degree between the failure modes. On this basis, the reliability of the forage crusher is improved by optimizing the structure and working parameters. Before optimization, the fatigue reliability, wear reliability, and vibration reliability of the hammer rotor are 0.878, 0.94, and 0.248, respectively, and the reliability of the hammer rotor under multiple failure modes is 0.2116. After optimization, the fatigue, wear, and vibration reliability are 0.979, 0.9997, and 0.932, respectively. The reliability of the hammer rotor under multiple failure modes is 0.923, which reduces the probability of failure within the design life and meets the requirement that the reliability of key parts of agricultural and animal husbandry machinery is not less than 90 %. This study validates the reliability models and multi-objective optimization results and serves as a reference for forage crusher structural reliability design and optimization.
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Fatigue life prediction and reliability analysis of the forage crusher rotor
Haixu Zhao,Zhiping Zhai,Yingsheng Mou,Le Liu,Yuezheng Lan,Hongmei Cui 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.4
To accurately predict fatigue life and reliability of the forage crusher rotor, the stress load spectrum of the rotor is obtained via the two-way fluid-structure coupling method, which calculates the coupled flow field in the forage crusher and rotor structure. The fatigue life of the rotor is predicted, and its reliability is analyzed. Finally, the rotor is optimized by a multiisland genetic algorithm. The results indicate that the fatigue life prediction based on fracture mechanics theory and the Gerber average stress correction method is more suitable for the prediction of the rotor’s fatigue life. After optimization, the fatigue life cycles of the rotor are increased from 1.229×10 8 to 7.67×10 8 and the reliability is increased from 89.4 % to 99.7 %. This meets the reliability requirement of key parts of agricultural and animal husbandry machinery. This study provides a reference for the prediction and optimization of fatigue life and reliability of forage crushers.
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Guoyong Wang,Yanyan Zhu,Yunhui Zhai,Wanxu Wang,Zhiping Du,Jieqiong Qin 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.47 No.-
A simple process to synthesize polyglycerol modified polysiloxane surfactants has been carried outapplying a “grafting-to” approach. After formation of allyl polyglycerol ether (APGE) from diglycerol(DGY) and allyl glycidyl ether (AGE), polysiloxane modified by designed number of polyglycerol groups(PHMS-APGE) were obtained by connecting the APGE structure to different Si H functionalizedpolyhydromethyl siloxane (PHMS). The synthesized APGE-PHMS were characterized by IR and 1H NMR. Solubility measurements showed that the solubility of the as-prepared polymers increased in polarsolvents with the increasing of the amount of hydrophilic APGE groups. Furthermore, the surface activity,surface adsorption, aggregation and spreading behaviors of APGE-PHMS were investigated utilizingsurface tension measurements, dynamic light scattering (DLS), transmission electron microscopy (TEM)and contact angle measurements. The results showed that critical aggregation concentration (CAC) andthe time needed to reach adsorption equilibrium on water surface decrease systematically with theincrease in the number of APGE groups. These polymers in aqueous solutions could aggregate to formspherical assemblies. Moreover, the spreading behavior of these polymers on low energy surface wasfound to be influenced by the number of hydrophilic APGE groups.
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