15222

13683

كارشناسي ارشد

فناوري نساجي

اصفهان : دانشگاه صنعتي اصفهان

1398

هشت، 126ص

سيد عبدالكريم حسيني

سعيد آجلي

افسانه ولي پوري، صديقه برهاني

1398/07/30

كتابنامه

مهندسي نساجي

مهندسي نساجي

1398/07/30

2567501

چكيده 1 1 فصل اول 2 1 1 مقدمه 2 1 2 تعريف راحتي لباس 3 1 2 1 راحتي حرارتي 3 1 2 2 راحتي تماسي 4 1 2 3 راحتي برازندگي 4 1 3 اهميت راحتي حرارتي لباس 4 1 4 مكانيزم هاي كنترل دماي بدن جهت دست يابي به راحتي حرارتي 6 1 5 مكانيزم هاي مورد استفاده در پوشاك جهت دست يابي به راحتي حرارتي 9 1 5 1 عايق حرارتي 9 1 5 2 موينگي و انتقال رطوبت 9 1 6 شاخص راحتي حرارتي و انواع اندازه گيري آن 9 1 6 1 پرسشنامه ارزيابي كيفي راحتي حرارتي 01 1 6 2 پرسشنامه راحتي حرارتي كيفي ارتقا يافته 01 1 6 3 مانكن حرارتي 11 1 6 4 مدل ديناميك سياالت 71 1 6 5 مدل شبكه عصبي 81 1 6 6 تحليل دستگاه عصبي بدن 02 1 7 انواع روشهاي استخراج سيگنال 24 HRV 1 7 1 الكتروكارديوگرافي 24 ECG 1 7 2 اشعه مادون قرمز 52 1 7 3 حسگرهاي فيزيولوژيكي 52 انتخاب مكانيزم تشخيص و نوع مواد حسگرهاي فيزيكي 52 مكانيزم پيزوالكتريك 62 آشنايي با پليمر 27 PVDF هشت

Designing of Flexible Sensor Based on the Piezoelectric Nanofiber PVDF to Evaluate the Effects of Garment Type on the Body Thermal Comfort Mohammad Mahdi Faghihimani mm faghihimani@tx iut ac ir September 2019 09 12 Department of Textile Engineering Isfahan University of Technology Isfahan 84156 83111 IranDegree M Sc Language Persian Dr s Abdolkarim Hosseini hoseinir@cc iut ac irAbstractThermal comfort is an important and influential indicator of human quality of life and function Ingeneral thermal comfort index indicates the level of balance in the sympathetic nervous system Whenthe inlet and outlet heat levels are equal and there is no need for the sympathetic nervous systemintervention to adjust the temperature the body feels thermally comfortable Nowadays neglecting thistopic in designing and manufacturing high performance sport military firefighting clothing meansinefficient product Also Attention to This Index Have Led to A Fundamental Change in Modern andIntelligent Technologies Such as Electronic Clothing With The Ability to Manage Body Temperatureand Humidity The purpose of this study for first step is to identify thermal comfort and find a practicalmethod for measuring it In the second step the construction of a thermal comfort index sensor andanalyzing its results under real conditions In this study frequency analysis of heart rate variability HRV was used as one of the newest and most accurate methods of thermal comfort measurement Itmeasures the ratio of the function of the sympathetic nervous system which regulates body temperature to the function of the vagous nervous system The method used to measure this index is to measure thelow frequency power 0 04 0 15 Hz to the high frequency power 0 15 0 4 Hz and report it as an LF HF index After An exercise activity the LF HF index is influenced by the heart rate and also the heartrate is influenced by the body temperature Therefore the proper function of clothing in exchanging bodyheat with the environment accelerates the process of reaching the body balance In this case the feelingof comfort increases with decreasing activity duration of the sympathetic nervous system Since themeasurement of thermal comfort index over a long period of time while it is not intended to causedisturbance in this study contrary to the conventional methods of measuring heart rate which is basedon the cardiac activity recorder a long term wearable sensor based on piezoelectric effect was used tomeasure heart rate In the nuclear fabrication of this sensor PVDF piezoelectric nanofibers were used In order to fabricate the sensor with optimum sensitivity single nozzle electrospinning with optimizedparameters was used Thus by producing highly oriented nanofibers containing the beta phase the sensorhas a minimum sensitivity of 5 N which is appropriate for heart rate measurement by connection ofsensor core to the electronic circuit of signal conditioning and processing final sensor built and used infield tests to detect thermal comfort indices 3 clothings of different genders including Coolmax cottonand polyester used in field tests The LF HF index was measured for each The amount of comfortobtained for polyester clothing was significantly lower than the comfort value obtained from Coolmaxand cotton clothing Also the LF HF index values were significantly correlated with participants qualitative evaluation results Keywords Thermal Convenience Piezoelectric Sensor PVDF Nanofibers Frequency Analysis

سيد عبدالكريم حسيني

سعيد آجلي

افسانه ولي پوري، صديقه برهاني