پديد آورنده :
فتاحي، ايمان
عنوان :
بهبود پيكربندي برداشت كننده هاي انرژي پيزوالكتريكي
مقطع تحصيلي :
كارشناسي ارشد
گرايش تحصيلي :
طراحي كاربردي
محل تحصيل :
اصفهان: دانشگاه صنعتي اصفهان، دانشكده مهندسي مكانيك
صفحه شمار :
نوزده، 118ص.: مصور
استاد راهنما :
حميدرضا ميردامادي
توصيفگر ها :
پهناي باند , حساسيت , چندجهته , اجزاي محدود , چند مودي , قاب فضايي , سطح مقطع نامتقارن , نسبت سطح به حجم
استاد داور :
سعيد ضيائي راد، مهدي جوان بخت
تاريخ ورود اطلاعات :
1395/07/14
چكيده فارسي :
نمادنامه هيجده چكيده فصل اول ديباچه انرژ برداشت توجيهپذير برداشت انرژ از مرتبه كم كاهش اندازه ابزارها الكترونيكي و كاهش ميزان توان مصرفي الكتريكي بيسيم فنآور پيشرفت انرژ برداشت منابع ۴ الكترومغناطيسي تابش ۵ گرمايي ۵ مكانيكي ۵ پايا حالت مكانيكي منابع الف ۵
چكيده انگليسي :
Improving Configuration of Piezoelectric Energy Harvesters Iman Fattahi i fattahi@me iut ac ir Date of Submission 2016 06 18 Department of Mechanical Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language Farsi Supervisor Hamid Reza Mirdamadi hrmirdamadi@cc iut ac ir Abstract Piezoelectric energy harvesters EHs are designed to operate at resonance in order to have the most electric power harvested Three challenges have been confronted by these EHs 1 low output power scavenged from low frequency vibrations 2 limited effectiveness of harvesting mechanism in a narrow band and 3 being unidirectional To overcome these challenges in this thesis a novel space frame EH is proposed A formulation is derived to calculate the responses of such a harvester to base accelerations based on the finite element method The natural frequencies of the space frame harvester and its corresponding cantilevered one are calculated according to the novel formulation The correspondence is based on their lengths total masses and fundamental frequencies The results are in good agreement with the values obtained from the ABAQUS software It is demonstrated that this novel multimodal EH has 11 natural frequencies less than 500Hz whereas the cantilevered beam has only 3 natural frequencies in that range Furthermore the space frame EH can be designed to be suitable for excitations with low frequencies as well as excitations in different directions Finally the electric responses of both harvesters such as output voltages currents RMS powers open and short circuit natural frequencies and optimal resistive loads are obtained The internal volume of the novel harvester and the surfaces of the tip mass can be utilized for the interface electrical circuit and other electronic components Other advantage of such a harvester is offering a larger area to attach piezoelectric layers Furthermore both free and clamped ends of the space frame undergo large amounts of strain in contrast with the conventional cantilevered beam which has large strains only in the clamped end The dimensions of substructure piezoelectric layers and end mass the total
استاد راهنما :
حميدرضا ميردامادي
استاد داور :
سعيد ضيائي راد، مهدي جوان بخت
