مهندسی نساجی گیلان:. گیل تکس

مهندسی نساجی گیلان:. گیل تکس

سایت تخصصی نساجی و پوشاک
مهندسی نساجی گیلان:. گیل تکس

مهندسی نساجی گیلان:. گیل تکس

سایت تخصصی نساجی و پوشاک

ﺑﺮرﺳﻲ ﺧﺎﺻﻴﺖ ﻓﺸﺎر ﭘﺬﻳﺮی ﻓﺮش ﻣﺎﺷﻴﻨﻲ

ﺑﺮرﺳﻲ ﺧﺎﺻﻴﺖ ﻓﺸﺎر ﭘﺬﻳﺮی ﻓﺮش ﻣﺎﺷﻴﻨﻲ

ﭼﻜﻴﺪه
در اﻳﻦ ﺗﺤﻘ ﻴﻖ 10 ﻧﻤﻮﻧﻪ ﻧﺦ ﺧﺎب ﻓﺮش ﻣﺎﺷﻴﻨﻲ ﺑﺎ ﻧﻤﺮه 10 5/ Nm از ﻣﺨﻠﻮطﻫﺎی ﻣﺘﻔﺎوت اﻟﻴﺎف اﻛﺮﻳﻠﻴﻚ ﺑﺎ
ﻇﺮاﻓﺘﻬﺎی ،10 7 و 15 دﻧﻴﺮی در ﺳﻴﺴﺘﻢ رﻳﺴﻨﺪﮔﻲ ﻧﻴﻤﻪ ﻓﺎﺳﺘﻮﻧﻲ ﺗﻮﻟﻴﺪ ﮔﺮدﻳﺪ. درﺻﺪ ﻣﺨﻠﻮط اﻟﻴﺎف ﺑﮕﻮﻧﻪای
اﻧﺘﺨﺎب ﺷﺪ ﻛﻪ ﻇﺮاﻓﺖ ﻣﺘﻮﺳﻂ و ﺗﻌﺪاد ﻣﺘﻮﺳﻂ اﻟﻴﺎف در ﻣﺨﻠﻮط ﺑﺮای ﺗﻮﻟﻴﺪ ﻧﻤﻮﻧﻪ ﻧﺨﻬﺎ ﻣﻄﺎﺑﻖ ﺑﺎ ﻧﻤﻮﻧﻪ ﺷﺎﻫﺪ
ﺑﺎﺷﺪ .
ﻧﻤﻮﻧﻪ ﻧﺨﻬﺎی ﺗﻮﻟﻴﺪی ﺗﺤﺖ ﻓﺮاﻳﻨﺪ دوﻻﺗﺎﺑﻲ ﺑﺎ ﺗﺎب در ﻣﺘﺮ 160، ﻗﺮار ﮔﺮﻓﺘﻨﺪ و ﺳﭙﺲ ﺧﻮاص ﻓﻴﺰﻳﻜﻲ و
ﻣﻜﺎﻧﻴﻜﻲ ﻧﺦﻫﺎ از ﺟﻤﻠﻪ ﺣﺠﻢ ﻣﺨﺼﻮص ﻧﺦ اﻧﺪازه ﮔﻴﺮی و ﻣﻮرد ﻣﻄﺎﻟﻌﻪ ﻗﺮار ﮔﺮﻓﺖ .
2 در ﻣﺮﺣﻠﻪ ﺑﻌﺪی از ﻧﺨﻬﺎی ذﻛﺮ ﺷﺪه ﻧﻤﻮﻧﻪ ﻓﺮش ﻫﺎی ﭘﺮز ﺑﺮﻳﺪه در ﺷﺮاﻳﻂ ﺗﺮاﻛﻢ ﭘﺮز ﺛﺎﺑﺖ ( 15 pile/cm
و )
ارﺗﻔﺎع ﭘﺮز (13mm) ﺗﻮﻟﻴﺪ ﮔﺮدﻳﺪ. ﺳﭙﺲ رﻓﺘﺎر ﻓﺸﺎر ﭘﺬﻳﺮی ﻧﻤﻮﻧﻪ ﻓﺮﺷﻬﺎ ﺑﺎ اﺳﺘﻔﺎده از دﺳﺘﮕﺎه اﻳﻨﺴﺘﺮون ﺗﺤﺖ
ﻓﺸﺎر ﺛﺎﺑﺖ (5.91 psi) اﻧﺪازه ﮔﻴﺮی ﮔﺮدﻳﺪ. ﭘﺎراﻣﺘﺮﻫﺎی ﻓﺸﺎر ﭘﺬﻳﺮی ﺷﺎﻣﻞ اﻧﺮژی ﻓﺸﺮدﮔﻲ WC ، اﻧﺮژی
ﺑﺮﮔﺸﺖ ﭘﺬﻳﺮی W′C، ﺧﺎﺻﻴﺖ ارﺗﺠﺎﻋ ﻲ RC و ﻓﺎﻛﺘﻮر ﻓﺸﺎر ﭘﺬﻳﺮیE.M.C ﻣﺤﺎﺳﺒﻪ و ﺳﭙﺲ ﺑﺎ اﺳﺘﻔﺎده از
آزﻣﻮن ANOVA و Duncan ﻣﻮرد ﺗﺠﺰﻳﻪ وﺗﺤﻠﻴﻞ آﻣﺎری ﻗﺮار ﮔﺮﻓﺘﻨﺪ .
ﻳﻧﺘﺎ ﺞ ﻧﺸﺎن داد ﻛﻪ ﺑﺎ اﻓﺰاﻳﺶ درﺻﺪ ﻟﻴﻒ 15 دﻧﻴﺮی ﻛﻪ ﻃﻮل ﺑﻴﺸﺘﺮی دارد، اﺳﺘﺤﻜﺎم و ازدﻳﺎد ﻃﻮل ﺗﺎ ﺣﺪﭘﺎرﮔﻲ
ﻧﻤﻮﻧﻪ ﻧﺨﻬﺎ اﻓﺰاﻳﺶ ﻣﻲ ﻳﺎﺑﺪ و ﺣﺠﻢ ﻧﺦ از ﻳﻚ روﻧﺪ ﻛﺎﻫﺸﻲ، ﺳﭙﺲ اﻓﺰاﻳﺸﻲ ﭘﻴﺮوی ﻣﻲﻧﻤﺎﻳﺪ .
ﻣﺸﺎﻫﺪه ﺷﺪ ﻛﻪ ﭘﺎراﻣﺘﺮﻫﺎی اﻧﺮژی ﻓﺸﺮدﮔﻲWC ، اﻧﺮژی ﺑﺮﮔﺸﺖ ﭘﺬﻳﺮی W ′C ، ﺧﺎﺻﻴﺖ ارﺗﺠﺎﻋ ﻲ RC ﻛﻓﺎ ، ﺘﻮر
ﻓﺸﺎر ﭘﺬﻳﺮ ی E.M.C ﻳﻚ روﻧﺪ اﻓﺰاﻳﺸﻲ و ﺳﭙﺲ ﻛﺎﻫﺸﻲ ﻧﺸﺎن ﻣﻲدﻫﻨﺪ و اﻳﻦ ﭘﺎراﻣﺘﺮﻫﺎ در ﻧﻤﻮﻧﻪیا ﻛﻪ دارای
ﻴاﻟ ﺎف 7و 10 و15 ﺮﻴ دﻧ ی ﺑﻪ ﺗﺮﺗﻴﺐ ﻣﻌﺎدل 67 % ، 18 و% %15 ﻣﻲﺑﺎﺷﺪ ﺑﻴﺸﺘﺮﻳﻦ ﻣﻘﺪار را دارا ﻫﺴﺘﻨﺪ .
واژهﻫﺎی ﻛﻠﻴﺪی : : ﻧﺦ ﺧﺎب، ﻓﺮش ﭘﺮز ﺑﺮﻳﺪه، اﻟﻴﺎف اﻛﺮﻳﻠﻴﻚ، رﻓﺘﺎر ﻓﺸﺎر ﭘﺬﻳﺮی، درﺻﺪ ﻣﺨﻠﻮط ، ﭘﺎراﻣﺘﺮﻫﺎی ﻓﺸﺎر ﭘﺬﻳﺮ ی

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مدیر سایت چهارشنبه 4 اردیبهشت‌ماه سال 1392 ساعت 07:19 ب.ظ
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ﻣﻄﺎﻟﻌﻪ ﻧﻴﺮوی وارد ﺑﺮ ﻧﺦ در ﻣﺤﻞ ﺗﻤﺎس ﻧﺦ ﺑﺎ ﺑﺎﻟﻮنﮔﻴﺮ در ر

ﻣﻄﺎﻟﻌﻪ ﻧﻴﺮوی وارد ﺑﺮ ﻧﺦ در ﻣﺤﻞ ﺗﻤﺎس ﻧﺦ ﺑﺎ ﺑﺎﻟﻮنﮔﻴﺮ در رﻳﺴﻨﺪﮔﻲ رﻳﻨﮓ اﺻﻼح ﺷﺪه ﺑﺎ اﺳﺘﻔﺎده از ﭘﺮدازش ﺳﻴﮕﻨﺎل
 ﻋﻠﻲ اﻛﺒﺮ ﻗﺮه آﻏﺎﺟﻲ، رﻣﻀﺎﻧﻌﻠﻲ اﺑﻮزاده ، ﺳﺠﺎد ﻏﻔﺎری ﺑﺎرﺑﻴﻦ
ﭼﻜﻴﺪه
ﻋﻠﻲ رﻏﻢ ﻇﻬﻮر اﻧﻮاع ﺳﻴﺴﺘﻢﻫﺎی رﻳﺴﻨﺪﮔﻲ ﻣﺪرن ﺳﻴﺴﺘﻢ رﻳﺴﻨﺪﮔﻲ رﻳﻨﮓ ﺑﺪﻟﻴﻞ ﺑﺮﺗﺮیﻫﺎﻳﻲ ﻛﻪ دارد ﻫﻨﻮز ﻫﻢ ﻣﻮرد اﺳﺘﻔﺎده ﻗﺮار ﻣﻲﮔﻴﺮد. در ﻫﻤﻴﻦ راﺳﺘﺎ ﺗﻼشﻫﺎ در ﺟﻬﺖ ارﺗﻘﺎی ﻛﻴﻔﻴﺖ ﻧﺦ ﺗﻮﻟﻴﺪی اﻳﻦ ﺳﻴﺴﺘﻢ ﻫﻤﭽﻨﺎن اداﻣﻪ دارد. ﻛﺸﺶ ﻧﺦ ﻳﻜﻲ از ﻋﻮاﻣﻞ ﻣﻮﺛﺮ در ﻛﺎرآﻳﻲ ﺳﻴﺴﺘﻢ رﻳﻨﮓ اﺳﺖ ﻛﻪ ﺑﻬﻴﻨﻪ ﺳﺎزی آن ﺑﺎﻋﺚ ﻓﺸﺮدﮔﻲ و ﺗﺠﻤﻊ ﻣﻨﺎﺳﺐ اﻟﻴﺎف در ﺳﺎﺧﺘﻤﺎن ﻧﺦ در ﺣﻴﻦ اﻋﻤﺎل ﺗﺎب ﺧﻮاﻫﺪ ﺷﺪ. اﺑﻌﺎد ﻣﺜﻠﺚ رﻳﺴﻨﺪﮔﻲ ﺗﺎﺛﻴﺮ ﺑﺴﻴﺎر زﻳﺎدی در ﺳﺎﺧﺘﻤﺎن ﻧﺦ دارﻧﺪ و ﺗﺎﺑﻌﻲ از ﻣﻴﺰان ﻛﺸﺶ اﻋﻤﺎل ﺷﺪه ﺑﻪ ﺟﺮﻳﺎن اﻟﻴﺎف، وﻳﮋﮔﻲﻫﺎی اﻟﻴﺎف و ﭘﺎراﻣﺘﺮﻫﺎی اﺑﻌﺎدی ﻣﺎﺷﻴﻦ ﻣﻲﺑﺎﺷﺪ. در اﻳﻦ ﻣﻄﺎﻟﻌﻪ ﺑﺮای ﺑﻬﺒﻮد اﺑﻌﺎد ﻣﺜﻠﺚ رﻳﺴﻨﺪﮔﻲ ﺑﺎ ﻣﻌﺮﻓﻲ ﻃﺮﺣﻲ ﺟﺪﻳﺪ ﺑﺮای ﻏﻠﺘﻚ ﺟﻠﻮﻳﻲ ﻧﺎﺣﻴﻪ ﻛﺸﺶ ﻣﺎﺷﻴﻦ رﻳﻨﮓ روش ﻧﻮﻳﻨﻲ ﺑﺮای ﻛﻨﺘﺮل اﺑﻌﺎد ﻣﺜﻠﺚ و ﺑﺮرﺳﻲ ﺗﺎﺛﻴﺮ آن ﺑﺮ ﻧﻴﺮوی وارد ﺑﺮ ﻧﺦ در ﻣﺤﻞ ﺗﻤﺎس ﺑﺎ ﺣﻠﻘﻪ ﺑﺎﻟﻮن ﮔﻴﺮ اراﺋﻪ ﺷﺪه اﺳﺖ. ﻧﺘﺎﻳﺠﻲ ﻛﻪ ﺗﻐﻴﻴﺮ ﺷﻜﻞﻫﺎی اﻧﺠﺎم ﮔﺮﻓﺘﻪ در ﺑﺮ ﺧﻮاﻫﺪ داﺷﺖ ﻋﺒﺎرﺗﻨﺪ از ﺗﻐﻴﻴﺮ ﺷﻜﻞ و ﺗﺎﺑﺪار ﺷﺪن ﻧﺦ از ﺷﻜﻞ ﺗﺎب روﺑﺎﻧﻲ ﻣﺘﺪاول در روش رﻳﻨﮓ و ﻧﺰدﻳﻚ ﺷﺪن ﺗﺎب ﻧﺦ ﺑﻪ ﺷﻜﻞ ﺗﺎب ﺳﻴﻠﻨﺪری(ﺗﺎب اﻳﺪهآل ).
واژهﻫﺎی ﻛﻠﻴﺪی: رﻳﺴﻨﺪﮔﻲ رﻳﻨﮓ، ﺣﻠﻘﻪ ﺑﺎﻟﻮن ﮔﻴﺮ، اﺻﻼح ﻏﻠﺘﻚ ﻛﺸﺶ، ﻧﻴﺮوی وارد ﺑﺮ ﻧﺦ، ﭘﺮدازش ﺳﻴﮕﻨﺎل

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مدیر سایت چهارشنبه 4 اردیبهشت‌ماه سال 1392 ساعت 07:16 ب.ظ
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ﺗﺎﺛﻴﺮ ﻣﻮﻗﻌﻴﺖ ﻓﻨﺮ ﭘﻞ ﺗﺎر ﺑﺮ ﺗﺮاﻛﻢ ﭘﻮدی ﭘﺎرﭼﻪ


ﺗﺎﺛﻴﺮ ﻣﻮﻗﻌﻴﺖ ﻓﻨﺮ ﭘﻞ ﺗﺎر ﺑﺮ ﺗﺮاﻛﻢ ﭘﻮدی ﭘﺎرﭼﻪ
ﺳﻴﺪ اﻣﻴﺮ ﺣﺴﻴﻦ دوﺳﺘﺎﻧﻪ، ﻋﻠﻲ ﺟﻬﺎﻧﮕﻴﺮ

ﭼﻜﻴﺪه
اﻳﻦ ﺗﺤﻘﻴﻖ ﺑﻪ ﺑﺮرﺳﻲ ﻣﺸﻜﻞﻫﺎ و ﻋﻴﻮب ﭘﺎرﭼﻪی ﺑﺎﻓﺘﻪ ﺷﺪه روی ﻣﺎﺷﻴﻦﻫﺎی ﺑﺎﻓﻨﺪﮔﻲ دارای دو ﭼﻠﻪ و راه ﻛﺎرﻫﺎی پیﺸﻨﻬﺎد ﺷﺪه ﺗﻮﺳﻂ ﻣﺨﺘﺮﻋﻴﻦ و ﻛﻤﭙﺎﻧﻲﻫﺎی ﻣﺨﺘﻠﻒ ﺟﻬﺖ رﻓﻊ اﻳﻦ ﻋﻴﻮب ﻣﻲﭘﺮدازد. ﺑﻪ ﻃﻮر ﻣﻌﻤﻮل ﺳﺎﺧﺖ و ﺗﻮﻟﻴﺪ اﺳﻨﻮ ﺑﺎ ﻋﺮض ﺑﻴﺸﺘﺮ از 3 ﻣﺘﺮ ﺑﻪ دﻟﻴﻞ اﻓﺰاﻳﺶ ﺧﻤﺶ درآن و ﺳﺨﺖ و دﺷﻮار ﺷﺪن ﺣﻤﻞ و ﻧﻘﻞ اﺳﻨﻮ ﺑﻪ ﺧﺼﻮص ﻫﻨﮕﺎﻣﻲ ﻛﻪ ﭘﺮ ﺑﺎﺷﺪ، ﻣﻤﻜﻦ و ﻳﺎ ﻣﺘﺪاول ﻧﻴﺴﺖ. ﺑﻪ ﻫﻤﻴﻦ ﺟﻬﺖ در ﻣﺎﺷﻴﻦﻫﺎی ﻋﺮﻳﺾ از 2 اﺳﻨﻮ و ﻫﻤﻴﻦ ﻃﻮر 2 ﭘﻞ ﺗﺎر ﻛﻨﺎر ﻫﻤﺪﻳﮕﺮ اﺳﺘﻔﺎده ﻣﻲ .ﺷﻮد ﻋﻤﺪهی ﻣﺸﻜﻞﻫﺎ در اﻳﻦ ﻧﻮع ﻣﺎﺷﻴﻦ ﺑﺎﻓﻨﺪﮔﻲ ﺑﻪ ﻋﻠﺖ ﺗﻔﺎوت ﻛﺸﺶ در ﻧﺦﻫﺎی ﺗﺎری ﻛﻪ از روی دو ﭘﻞ ﺗﺎر ﻣﺠﺰا ﻋﺒﻮر ﻣﻲﻛﻨﻨﺪ و در ﻳﻚ ﭘﺎرﭼﻪ ﺑﺎﻓﺘﻪ ﻣﻲﺷﻮﻧﺪ، اﻳﺠﺎد ﻣﻲ .ﺷﻮد ﻛﻤﭙﺎﻧﻲﻫﺎی ﻣﺨﺘﻠﻒ ﺳﺎزﻧﺪهی ﻣﺎﺷﻴﻦﻫﺎی ﺑﺎﻓﻨﺪﮔﻲ ﻋﺮﻳﺾ در ﺳﺮاﺳﺮ ﺟﻬﺎن ﺑﺎ ﺗﻮﺟﻪ ﺑﻪ ﺗﺤﻘﻴﻖﻫﺎی ﻣﺤﻘﻘﻴﻦ و اﺧﺘﺮاعﻫﺎی ﻣﺨﺘﺮﻋﻴﻦ راه ﻛﺎر ﻫﺎ ﻫﺎﻳﻲ را ﺑﺮای از ﺑﻴﻦ ﺑﺮدن و ﻳﺎ ﻛﺎﻫﺶ اﻳﻦ ﻣﺸﻜﻞ اراﺋﻪ ﻛﺮدهاﻧﺪ،ﻛﻪ اﻳﻦ ﺗﺤﻘﻴﻖ ﺑﻪ ﺑﻴﺎن اﻳﻦ راهﻛﺎرﻫﺎ ﻧﻴﺰ  ﻣﻲﭘﺮدازد. در ﻧﻬﺎﻳﺖ در اﻳﻦ ﺗﺤﻘﻴﻖ ﺳﻌﻲ ﺷﺪه ﺑﺎ اﺳﺘﻔﺎده از اﻣﻜﺎنﻫﺎی ﻣﻮﺟﻮد در روی دﺳﺘﮕﺎهﻫﺎی در ﺣﺎل ﻛﺎر در اﻳﺮان و ﺑﺮرﺳﻲ اﺛﺮ آﻧﻬﺎ روی ﻛﺸﺶ ﻧﺦﻫﺎی ﺗﺎر ﺑﻪ راهﻛﺎری رﺳﻴﺪ ﻛﻪ ﺑﺎ اﺳﺘﻔﺎده از آن و ﺑﺪون اﺿﺎﻓﻪ ﻛﺮدن ﺗﺠﻬﻴﺰﻫﺎیاﺿﺎﻓﻲ و ﺻﺮف ﻫﺰﻳﻨﻪﻫﺎی ﮔﺰاف اﻳﻦ ﻣﺸﻜﻞ را ﻛﻨﺘﺮل ﻧﻤﻮد . ﻳﻜﻲ از اﺟﺰای ﭘﻞ ﺗﺎر ﻗﻄﻌﻪای ﺑﻪ ﻧﺎم ﺷﻤﺸﻴﺮی ﻣﻲﺑﺎﺷﺪ ﻛﻪ ﻣﻮﻗﻌﻴﻴﺖ ﻓﻨﺮ روی آن ﻣﻲﺗﻮاﻧﺪ زاوﻳﻪی ﺗﻤﺎس ﻧﺦﻫﺎی ﺗﺎر را ﺑﺎ ﭘﻞ ﺗﺎر ﺗﻐﻴﻴﺮ داده و ﺑﺎﻋﺚ ﺗﻔﺎوت در ﻛﺸﺶ ﻧﺦﻫﺎی ﺗﺎر ﺷﻮد. ﺑﺎ اﻳﻦ ﺗﻮاﻧﺎﻳﻲ ﺗﻨﻈﻴﻢ ﻛﺸﺶ ﻧﺦﻫﺎی ﺗﺎر، ﻣﻲﺗﻮان ﭘﺎرﭼﻪای ﺑﺪون ﻋﻴﺐ ﺗﻮﻟﻴﺪ ﻛﺮد .
واژهﻫﺎی ﻛﻠﻴﺪی: ﻓﻨﺮ ﭘﻞ ﺗﺎر، ﻫﺎ ﻣﺎﺷﻴﻦ ی ﺑﺎﻓﻨﺪﮔﻲ دو ﭼﻠﻪ، ﭘﻞ ﺗﺎر، ﻣﺎﺷﻴﻦ ﺑﺎﻓﻨﺪﮔﻲ ﺳﻮﻟﺰر، ﻣﺎﺷﻴﻦ ﺑﺎﻓﻨﺪﮔﻲ ﻋﺮﻳﺾ

ادامه مطلب ...
مدیر سایت چهارشنبه 4 اردیبهشت‌ماه سال 1392 ساعت 07:14 ب.ظ
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اﻧﺪازهﮔﻴﺮی ﻛﺸﺶ ﻧﺦ در ﺑﺎﻓﻨﺪﮔﻲ ﺑﺎ اﺳﺘﻔﺎده از ﺣﺴﮕﺮ ﻏﻴﺮ ﺗ

اﻧﺪازهﮔﻴﺮی ﻛﺸﺶ ﻧﺦ در ﺑﺎﻓﻨﺪﮔﻲ ﺑﺎ اﺳﺘﻔﺎده از ﺣﺴﮕﺮ ﻏﻴﺮ ﺗﻤﺎﺳﻲ
ﻓﺮﻫﺎد ﺛﻨﺎﺋﻲ ، ﺳﻴﺪ ﻋﺒﺎس ﻣﻴﺮ ﺟﻠﻴﻠﻲ
ﭼﻜﻴﺪه
ﺑﺮای اﻧﺪازهﮔﻴﺮی ﻛﺸﺶ ﻧﺦ از ﻛﺸﺶﺳﻨﺠﻬﺎ اﺳﺘﻔﺎده ﻣﻲﺷﻮد ﻛﻪ ﻋﻤﺪﺗﺎ ﺑﻪ ﺻﻮرت ﻛﺸﺶﺳﻨﺠﻬﺎی ﺗﻤﺎﺳﻲ ﻣﻲﺑﺎﺷﻨﺪ . در ﻛﺸﺶﺳﻨﺠﻬﺎی ﻧﻮع ﺗﻤﺎﺳﻲ ﺑﺪﻟﻴﻞ ﺗﻤﺎس ﻣﺴﺘﻘﻴﻢ ﻧﺦ ﺑﺎ ﺣﺴﮕﺮ ﻛﺸﺶﺳﻨﺞ و اﻋﻤﺎل ﻛﺸﺶ اﺿﺎﻓﻲ ﺑﻪ ﻧﺦ، ﻣﻘﺪار ﻋﺪدی ﻛﺸﺶ ﻧﺦ اﻧﺪازه ﮔﻴﺮی ﺷﺪه، از دﻗﺖ ﻛﺎﻓﻲ ﺑﺮﺧﻮردار ﻧﺒﻮده و دارای ﺧﻄﺎ ﻣﻲﺑﺎﺷﺪ. در ﻣﻘﺎﻟﻪ ﺣﺎﺿﺮ، ﻳﻚ ﻧﻮع ﻛﺸﺶﺳﻨﺞ ﻣﻌﺮﻓﻲ ﺷﺪه ﻛﻪ ﻗﺎدر اﺳﺖ ﻛﺸﺶ ﻧﺦ را ﺗﻮﺳﻂ ﻳﻚ ﺣﺴﮕﺮ ﻏﻴﺮ ﺗﻤﺎﺳﻲ اﻧﺪازه ﮔﻴﺮی ﻛﻨﺪ. اﺻﻮل ﻛﺎر اﻳﻦ ﻛﺸﺶ ﺳﻨﺞ ﺑﺮ ﭘﺎﻳﻪ ارﺗﻌﺎﺷﺎت ﻣﻜﺎﻧﻴﻜﻲ ﻣﻲ ﺑﺎﺷﺪ. در اﻳﻦ ﻧﻮع ﻛﺸﺶﺳﻨﺞ ﺑﺎ اﻧﺪازهﮔﻴﺮی ﻓﺮﻛﺎﻧﺴﻬﺎی ﻃﺒﻴﻌﻲ ﻧﺦ ، ﻣﻲ ﺗﻮان ﻣﻘﺪار ﻛﺸﺶ ﺛﺎﺑﺖ در ﻧﺦ را در ﺣﺎﻟﺘﻬﺎی اﺳﺘﺎﺗﻴﻜﻲ و دﻳﻨﺎﻣﻴﻜﻲ اﻧﺪازه ﮔﻴﺮی ﻧﻤﻮد .. در اﻳﻦ ﻣﻘﺎﻟﻪ ﻋﻤﻠﻜﺮد ﻛﺸﺶ ﺳﻨﺞ ﻏﻴﺮﺗﻤﺎﺳﻲ در ﺣﺎﻟﺖ اﺳﺘﺎﺗﻴﻜﻲ و ﺗﺎﺛﻴﺮ ﻣﺘﻐﻴﻴﺮ ﻫﺎی ﻣﺨﺘﻠﻒ روی آن ، ﻣﻮرد ﺑﺮرﺳﻲ ﻗﺮار ﮔﺮﻓﺘﻪ اﺳﺖ. ﺑﺎ ﻣﻘﺎﻳﺴﻪ و ﺑﺮرﺳﻲ ﻣﻘﺎدﻳﺮ ﺗﺌﻮری ﺑﺎ ﻧﺘﺎﻳﺞ آزﻣﺎﻳﺸﮕﺎﻫﻲ، دﻳﺪه ﺷﺪه اﺳﺖ ﻛﻪ دﻗﺖ ﻋﻤﻠﻜﺮد ﻛﺸﺶ ﺳﻨﺞ ﻏﻴﺮ ﺗﻤﺎﺳﻲ ، ﺑﺎﻻی 95% ﻣﻲ ﺑﺎﺷﺪ .
واژهﻫﺎی ﻛﻠﻴﺪی: ﻛﺸﺶ ﻧﺦ، ﻛﺸﺶﺳﻨﺞ ﻏﻴﺮ ﺗﻤﺎﺳﻲ ، ﻧﺦ ﻣﺮﺗﻌﺶ ، ﻓﺮﻛﺎﻧﺲ ﻃﺒﻴﻌﻲ ﻧﺦ

ادامه مطلب ...
مدیر سایت چهارشنبه 4 اردیبهشت‌ماه سال 1392 ساعت 07:11 ب.ظ
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Designing Of Fancy Yarns Using Novelty Manufacturing Concept

Designing Of Fancy Yarns Using Novelty Manufacturing Concept
P.V. KADOLE, M.C. BURJI, V.MAHESH, S.S.APARAJ
Abstract
Fancy yarns which are also termed as novelty yarns, specialty yarns, effect yarns and fashion orientedyarns. Effect yarns are yarns which are given pre-programmed characters at spinning stageelectronically controlled, and consequently 100% reproducible. It is generated during the spinning process by controlling yarn diameter and length structure of the yarn, by effect devices. Our ultimate aim is to develop electronic programme(EP) for fancy yarns such as slub, Multicount and Multitwist of cotton and polyester-viscose blend using amsler device attached to the LG 5/1 Ring frame machine and provide information about properties, which is measurable and quantifiable, which forms the basis of this paper. Fancy yarns produced showed significant variation for properties like tenacity, breaking elongation, breaking time, U%, relative resistance value and twist per inch, but no significant effect was seen for properties such as hairiness and friction. Multicount yarn is suitable for weaving onhigh-speed looms with eye-catching look.
 Keywords: Classification, Effect device, Slub, Multicount and Multiwist.

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مدیر سایت چهارشنبه 4 اردیبهشت‌ماه سال 1392 ساعت 07:10 ب.ظ
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Interlacing Metallic Filaments by Rotational Permanent Magnetic

Interlacing Metallic Filaments by Rotational Permanent Magnetic Field
P. Payvandy, M. Latifi, and M. Agha-Mirsalim
Abstract
In this paper the possibility of interlacing current-carrying conductive filaments in a rotational permanent magnetic field is described. The work contains two parts. Firstly, the effect of magnetic forces on current-carrying conductive filaments in a rotational permanent magnetic field is theoretically studied. Secondly, in accordance with the theoretical analysis, a prototype of the proposed system is designed and tested. The experimental results prove the capability of the method to interlace conductive filaments. The proposed method can be employed as a kernel to reach a texturing system for conductive filaments
Keywords: Conductive Filaments, Interlacing, Permanent Magnets, Rotational Magnetic Field

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مدیر سایت چهارشنبه 4 اردیبهشت‌ماه سال 1392 ساعت 07:04 ب.ظ
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A Novel Application of the Regenerated Cellulose as the Coating

A Novel Application of the Regenerated Cellulose as the Coating of PET Filaments
 Dariush Semnani, Mohammad Sheikhzadeh, Zahra Mazrouei, Bentolhoda Abedinzadeh

Abstract
Combination of various manmade polymers has been developed to make fibers with special properties. Fibers are combined at a generation process such as soluble or melting polymers or spinning process such as filament, staple, sliver, yarn, etc. Hybrid blended yarns have been produced as the common form of yarns used in textile industry. Most of the spun blended yarns are produced through cotton-polyester or viscose-polyester in the spinning process. The cellulose fibers blended in spun yarns should be at least 1 inch in length with appropriate surface properties to be blended with polyester staple fibers in spinning. This matter causes limitation in using the cheap materials. In this research, a novel method for blending regenerated cellulose structure with polyester filaments has been examined. Polyester filaments in various forms were coated by viscose layer. Properties of produced yarn were experimented for surface properties, handle and moisture absorbance ability. The result presented that all properties of the samples were improved specially in moisture absorbance, handle and appearance.
Keywords: Hybrid yarns, Wood pulp, Polyester, Viscose, Rayon, Coating
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مدیر سایت چهارشنبه 4 اردیبهشت‌ماه سال 1392 ساعت 07:02 ب.ظ
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On the Reinforcement of Steel-Slag Asphalt-Concrete Structures U


On the Reinforcement of Steel-Slag Asphalt-Concrete Structures Using Poly Propylene Fibers

Sayyed MAHDI Abtahi, Reza Khodadadi , Saeed Puladsaz , Ehsan Tavakkoland Sayyed MAHDI Hejazi

Abstract

Asphalt Concrete (AC), a mixture of bitumen and aggregates, is a sensitive structure compared with other civil configurations. So, Scientists and engineers are constantly trying to improve the performance of asphalt pavements. Generally Fibers and Polymers are two important cases used in this way. But the most popular bitumen modification

technique is polymer modification. However, it has been claimed that among various modifiers for asphalt, fibers have gotten much attention for their excellent improvement effects. On the other hand; Steel Slag is the major byproduct from the conversion of iron to steel. Recently; it has evolved as an ideal aggregate in AC Structures because of its admirable mechanical properties. Therefore the aim of this paper has been concentrated to investigate the effect of Poly Propylene, PP, fibres on the mechanical properties of asphalt- concrete made from steel slag. This innovative mixture was evaluated by Marshall and Specific Gravity Tests. Thus it was found that using steel slag aggregates improved optimized bitumen content, stability, flow and specific gravity. Fiber attendance enhanced stability while flow declined in both cases (steel slag and conventional aggregates). Specific gravity did not significantly change. Finally, Dunnet Test, a novel statistical test, was employed to evaluate data and to compare different treatments.

Keywords: Asphalt Concrete, Reinforcement, Poly Propylene Fibres, Dunnet Test.

ادامه مطلب ...
مدیر سایت چهارشنبه 4 اردیبهشت‌ماه سال 1392 ساعت 06:58 ب.ظ
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