Associated dynamic performance of the clamping force control valve used in continuously variable transmission （CVT） is optimized. Firstly, the structure and working principle of the valve are analyzed, and then a dy...Associated dynamic performance of the clamping force control valve used in continuously variable transmission （CVT） is optimized. Firstly, the structure and working principle of the valve are analyzed, and then a dynamic model is set up by means of mechanism analysis. For the purpose of checking the validity of the modeling method, a prototype workpiece of the valve is manufactured for comparison test, and its simulation result follows the experimental result quite well. An associated performance index is founded considering the response time, overshoot and saving energy, and five structural parameters are selected to adjust for deriving the optimal associated performance index. The optimization problem is solved by the genetic algorithm （GA） with necessary constraints. Finally, the properties of the optimized valve are compared with those of the prototype workpiece, and the results prove that the dynamic performance indexes of the optimized valve are much better than those of the prototype workpiece.展开更多
目的探讨氨磺必利对精神分裂症患者血清泌乳素(prolactin,PRL)水平及阳性与阴性症状量表(positive and negative syndrome scale,PANSS)分值的影响。方法选取2018年3月至2020年3月期间我院收治的精神分裂症患者156例,随机分为研究组和...目的探讨氨磺必利对精神分裂症患者血清泌乳素(prolactin,PRL)水平及阳性与阴性症状量表(positive and negative syndrome scale,PANSS)分值的影响。方法选取2018年3月至2020年3月期间我院收治的精神分裂症患者156例,随机分为研究组和对照组,每组78例。对照组给予利培酮治疗,研究组给予氨磺必利治疗,两组疗程均为8周。比较两组患者治疗前后PANSS评分、血清PRL水平、体质量以及治疗总有效率,并评估两组患者不良反应发生情况。结果治疗8周后,两组PANSS评分总分及各项得分均较治疗前降低(P<0.05),且研究组PANSS评分总分及阴性症状评分低于对照组(P<0.05)。治疗8周后,两组血清PRL水平均较治疗前提高(P<0.05),但研究组血清PRL水平低于对照组(P<0.05)。研究组治疗总有效率为97.44%,高于对照组的80.76%(P<0.05)。治疗4及8周后,研究组不良反应评分均低于对照组(P <0.05)。结论精神分裂症患者应用氨磺必利后PRL升高的幅度小于利培酮,而总的不良反应比利培酮更少,有利于改善患者对治疗的依从性,可推广使用。展开更多
基金Key Science-Technology Foundation of Hunan Province, China (No. 05GK2007).
文摘Associated dynamic performance of the clamping force control valve used in continuously variable transmission （CVT） is optimized. Firstly, the structure and working principle of the valve are analyzed, and then a dynamic model is set up by means of mechanism analysis. For the purpose of checking the validity of the modeling method, a prototype workpiece of the valve is manufactured for comparison test, and its simulation result follows the experimental result quite well. An associated performance index is founded considering the response time, overshoot and saving energy, and five structural parameters are selected to adjust for deriving the optimal associated performance index. The optimization problem is solved by the genetic algorithm （GA） with necessary constraints. Finally, the properties of the optimized valve are compared with those of the prototype workpiece, and the results prove that the dynamic performance indexes of the optimized valve are much better than those of the prototype workpiece.
