With the growing needs of prepreg tapes for the automated fiber placement(AFP),the deviation-rectifying of prepreg in slitting process was investigated on a self-developed 16-tow prepreg slitting and winding machine.T...With the growing needs of prepreg tapes for the automated fiber placement(AFP),the deviation-rectifying of prepreg in slitting process was investigated on a self-developed 16-tow prepreg slitting and winding machine.The process of slitting and rewinding of prepreg tape was introduced,and the reason of prepreg tape deviation in slitting process was analyzed.In order to ensure the quality of the narrow prepreg slits,the application of the fuzzy PID algorithm in a closed-loop control system was discussed.A fuzzy PID algorithm was designed by combining fuzzy rules and PID controller.By applying it to precise deviation-rectifying control strategy,the automatic control of rectification could be achieved with accuracy of 0.1 mm,which satisfies the requirement of the prepreg tape both in slitting quality and layup quality for AFP.展开更多
The concept of cutting platform is proposed and realized based on the latest two step automated tape laying (Two step ATL)technology,which separates prepreg cutting process from tape laying to improve productivity for...The concept of cutting platform is proposed and realized based on the latest two step automated tape laying (Two step ATL)technology,which separates prepreg cutting process from tape laying to improve productivity for large parts with small features.Two step ATL is more efficient than conventional layup because ply patches are pre cut in a separate operation.The concept of the prepreg tape cutting experimental platform with two cutters is introduced.Further,based on the automatic tape laying trajectory planning software,a two cutter cutting algorithm is proposed.Cutting experiments are reported to validate both the concept of cutting platform and cutting algorithm.展开更多
Hot flashes(HF)caused by low estrogen in menopause result from changes ir thermoregulatory processes in the hypothalamic preoptic area(POA).In the POA,transient receptor potential vanilloid 1(TRPV1)participate in heat...Hot flashes(HF)caused by low estrogen in menopause result from changes ir thermoregulatory processes in the hypothalamic preoptic area(POA).In the POA,transient receptor potential vanilloid 1(TRPV1)participate in heat dissipation processes.Studies suggest that TRPV1 expression may be regulated by norepinephrine(NE)-activated α2-adrenergic receptors(α2-ADR)in dorsal root ganglia.The goal of this study is to investigate the relationship between NE regulated TRPV1 expression in POA of ovariectomized rats and the development of HF.Ninety female adult Sprague-Dawley rats were divided into three groups:SHAM,OVX and E2.In the POA,the expression of TRPV1 and α2-ADR were determined using immunohistochemistry and Western blotting after 4 weeks of estrogen treatment,and NE content was detected using high-performance liquid chromatography.展开更多
基金financially supported by the National Basic Research Program of China(973Program)the Priority Academic Program Development of Jiangsu Higher Education Institutionsthe Fundamental Research Funds for the Central Universities ( No. 3082615NS2015056)
文摘With the growing needs of prepreg tapes for the automated fiber placement(AFP),the deviation-rectifying of prepreg in slitting process was investigated on a self-developed 16-tow prepreg slitting and winding machine.The process of slitting and rewinding of prepreg tape was introduced,and the reason of prepreg tape deviation in slitting process was analyzed.In order to ensure the quality of the narrow prepreg slits,the application of the fuzzy PID algorithm in a closed-loop control system was discussed.A fuzzy PID algorithm was designed by combining fuzzy rules and PID controller.By applying it to precise deviation-rectifying control strategy,the automatic control of rectification could be achieved with accuracy of 0.1 mm,which satisfies the requirement of the prepreg tape both in slitting quality and layup quality for AFP.
基金supported by the National Science and Technology Major Project(No.2016ZX04002-005)
文摘The concept of cutting platform is proposed and realized based on the latest two step automated tape laying (Two step ATL)technology,which separates prepreg cutting process from tape laying to improve productivity for large parts with small features.Two step ATL is more efficient than conventional layup because ply patches are pre cut in a separate operation.The concept of the prepreg tape cutting experimental platform with two cutters is introduced.Further,based on the automatic tape laying trajectory planning software,a two cutter cutting algorithm is proposed.Cutting experiments are reported to validate both the concept of cutting platform and cutting algorithm.
文摘Hot flashes(HF)caused by low estrogen in menopause result from changes ir thermoregulatory processes in the hypothalamic preoptic area(POA).In the POA,transient receptor potential vanilloid 1(TRPV1)participate in heat dissipation processes.Studies suggest that TRPV1 expression may be regulated by norepinephrine(NE)-activated α2-adrenergic receptors(α2-ADR)in dorsal root ganglia.The goal of this study is to investigate the relationship between NE regulated TRPV1 expression in POA of ovariectomized rats and the development of HF.Ninety female adult Sprague-Dawley rats were divided into three groups:SHAM,OVX and E2.In the POA,the expression of TRPV1 and α2-ADR were determined using immunohistochemistry and Western blotting after 4 weeks of estrogen treatment,and NE content was detected using high-performance liquid chromatography.
