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Peirong Ren,Zhengxing Zuo,Weiqing Huang 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.8
The effects of axial profile parameters on the main bearing performance of the engine were investigated through the numerical method based on elasto-hydrodynamic lubrication theory, average flow, and asperity contact model. Results show that quadratic profile significantly improves the bearing performance, and the influence of profile varies with its width-toheight ratio. The performance is most improved when the ratio is between 0.8 and 2. An artificial neural network fitting model was developed to predict bearing performance, and multiobjective optimum analyses were performed using genetic algorithm and particle swarm optimization. The optimization goals are average peak asperity contact pressure and average total friction loss. The obtained Pareto front roughly includes three groups, and solutions in group 1 achieve a balance of the two goals, with a width-to-height ratio of 1.5-2. Finally, bearing friction tests were conducted on four profiled bearings to verify the simulation model and optimization results.
Xiaohu Luo,Bo Chen,Ji Li,Bang Lan,Chenliang Zhou,Zhengxing Ren,Chenggang Ci,Yali Liu 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.124 No.-
Herein, we report a rational design and synthesis of a highly-efficient and eco-friendly glucomannanderivative (GA-2) by the introduction of the thiazole and Schiff base groups into glucomannan (GA). After confirmation of GA-2 by the spectroscopic methods, it was introduced as corrosion inhibitor withexcellent anti-corrosion action for mild steel (MS) in the simulated seawater. As-obtained results revealthat GA-2 has a significantly enhanced anticorrosion performance, and its inhibitive efficiency reaches98.8% at the 0.5 mmol L1 inhibitor concentration, much higher than that of GA (69.8%) and the intermediatederivative GA-1 (81.2%). The significantly enhanced protection performance could be attributed tothe rich S heteroatoms, aromatic rings, and Schiff base groups in the GA-2, which strongly promotes thechemisorption as well as physisorption between GAD and MS. X-ray photoelectron spectroscopy (XPS)results, show that the appearance of N-Fe and S-Fe bonds confirms the strongly anchoring interactionbetween GA and MS. Furthermore, according to the quantum chemical calculations, the results fromthe lowe energy gap and radical distribution function (RDF) analyses further confirm the strongchemisorption of GA-2 at the surface of steel, which illustrates the excellent inhibition performance atthe molecule and atom level.