پديد آورنده :
صفايي، محسن
عنوان :
طراحي، تحليل و ساخت يك ريز ميراگرا با استفاده از آلياژ حافظه دار
مقطع تحصيلي :
كارشناسي ارشد
گرايش تحصيلي :
طراحي كاربردي
محل تحصيل :
اصفهان: دانشگاه صنعتي اصفهان، دانشكده مكانيك
صفحه شمار :
[هشت]،96ص.: مصور،جدول،نمودار
يادداشت :
ص.ع.به فارسي و انگليسي
استاد راهنما :
محمود كدخدايي
استاد مشاور :
حميدرضا ميردامادي
توصيفگر ها :
نايتينول , سوپر الاستيك , ضريب استهلاك معادل ويسكوز
تاريخ نمايه سازي :
4/8/90
استاد داور :
مهران مرادي، محمد مشايخي
چكيده فارسي :
به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي
چكيده انگليسي :
Design Analysis and Manufacture of a Shape Memory Alloy Micro Damper Mohsen Safaei mohsenesafaei@gmail com July 19 2011 Department of Mechanical science Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc language Farsi Supervisour M Kadkhodaei Assist Prof kadkhodaei@cc iut ac ir Abstract Shape Memory Alloys SMAs as one of smart materials with special properties such as shape memory effect superelasticity and high strength against external forces These properties caused to apply these alloys inpractical and commercial application in recent decades Also some applications in micro systems have beendeveloped based on SMAs Nitinol is a famous SMA that presents considerable recoverable strain with highstress hysteresis during a loading unloading cycle This energy dissipating ability have been encouragedresearchers to apply these alloys in practical applications as damper Most of performed studies have beenconducted base on applicable damping of crude shape of SMAs such wire and proposed mechanisms withSMAs are few With consideration of this lack of researches a new micro damper is designed analyzed andmanufactured The point is to reach higher damping ability and exported displacement relative to behavior ofSMA wires and similar damping systems Two separated damping sets are employed in the same length of damper to increase exported displacement ofmechanism Each of these damping sets work on shaft movement to one side of its middle position Eachdamping set includes two NiTi wires one which is with initial strain and stress in equilibrium mode and theother one has maximum stress and strain in this position With shaft movement first wire starts to lengthenedand the other one starts to shortened As a result of this operation overall gained damping would be increased Based on a thermomechanical model of NiTi wires force displacement behavior of damper have beensimulated It has been shown that the designed mechanism have ability to damp the energy with an equivalentviscous damping ratio of 11 8 According to completed designed plan a specimen of damper is manufacturedand the procedure for assembly of components is presented A tension compression test is developed toinvestigate performance of the manufactured damper Test result shows an equivalent viscous damping of11 54 Also the force displacement behavior gained from test is in good conformity with simulation results Aparameter study is developed to find the effect of different parameters such as loading factors dimensions andproperties of NITi wires on damping and optimum values of each parameter is introduced Finally withconsideration of flexibility of mechanism to make changes in dimension and the SMA wire leading to changesin performance condition of the damper some commercial and practical applications are proposed In thisapplications imported force of system displacement frequency and dimension are main factors that have beenconsidered Key Words Shape Memory Alloys Nitinol Superelasticity Equivalent Viscous Damping Ratio
استاد راهنما :
محمود كدخدايي
استاد مشاور :
حميدرضا ميردامادي
استاد داور :
مهران مرادي، محمد مشايخي
