In this paper,a new type of machinery which can enlarge the stroke of air cylinder is introduced. It is very useful when the original stroke of air cylinder cannot satisfy the work requirement.According to design requ...In this paper,a new type of machinery which can enlarge the stroke of air cylinder is introduced. It is very useful when the original stroke of air cylinder cannot satisfy the work requirement.According to design requirements,its multi-objective mathematic model with constrained conditions is built. In order to solve this model, some methods are discussed and used such as penalty function method,variable metric method,Newton tangent method and bisection method. Based on the optimal result,motion curves of enlarging stroke mechanism are obtained. Results show that the motion characteristic of enlarging stroke of air cylinder mechanism is satisfying. In addition,we also consider the influence of different initial values of link length to optimal results and two important laws are got in this paper on the basis of optimal results.展开更多
基金Program for Changjiang Scholars and Innovative Research Team in University,China(No.IRT1220)Donghua University Thesis Innovation Fund,China(No.EG2014028)
文摘In this paper,a new type of machinery which can enlarge the stroke of air cylinder is introduced. It is very useful when the original stroke of air cylinder cannot satisfy the work requirement.According to design requirements,its multi-objective mathematic model with constrained conditions is built. In order to solve this model, some methods are discussed and used such as penalty function method,variable metric method,Newton tangent method and bisection method. Based on the optimal result,motion curves of enlarging stroke mechanism are obtained. Results show that the motion characteristic of enlarging stroke of air cylinder mechanism is satisfying. In addition,we also consider the influence of different initial values of link length to optimal results and two important laws are got in this paper on the basis of optimal results.
文摘目的探讨六字诀治疗脑卒中后认知障碍(post stroke cognitive impairment,PSCI)患者认知功能的效果及其对血脂水平的影响。方法选取2020年5月至11月于福建中医药大学附属康复医院进行治疗的34例PSCI患者,采用计算机随机分组,对照组及六字诀组各17例,对照组进行常规治疗、康复训练与护理,六字诀组在对照组基础上增加健身气功·六字诀训练,训练6~8 min/遍,3遍/次,1次/d,7 d/周,共进行12周训练。于干预前后采用福州版蒙特利尔认知评估量表(Chinese Fuzhou version of Montreal Cognitive Assessment Scale,MoCA-ChiFZ)评估患者的认知功能并抽血检测血脂水平。使用IBM SPSS 25.0对数据进行统计分析。结果干预前两组患者一般资料及指标差异无统计学意义,具有可比性。干预后,六字诀组MoCA-ChiFZ总分(23.56±1.71)分及注意维度评分5(5~6)分较对照组(22.31±1.66)分、4.5(4~5)分明显增高,差异具有统计学意义(P<0.05),其余维度评分差异无统计学意义(P>0.05);六字诀组三酰甘油(1.42±0.49)mmol/L水平明显低于对照组(2.13±0.86)mmol/L,差异具有统计学意义(P<0.05),其余血脂指标差异无统计学意义(P>0.05)。结论12周的健身气功·六字诀可有效改善PSCI患者的认知功能和三酰甘油水平,对PSCI患者具有良好的康复效果。
