پديد آورنده :
علامه، عليرضا
عنوان :
طراحي جاذب انرژي براي محافظت از محتوي كپسول خودايمن رهاشده از ارتفاع بالا
مقطع تحصيلي :
كارشناسي ارشد
گرايش تحصيلي :
طراحي كاربردي
محل تحصيل :
اصفهان : دانشگاه صنعتي اصفهان
صفحه شمار :
يازده، 82 ص، مصور، جدول، نمودار
استاد راهنما :
محمدرضا فروزان
استاد مشاور :
مهدي جوانبخت
توصيفگر ها :
سقوط كپسول محتوي انسان , جاذب انرژي ضربه , الاستومر , مدل ويسكوهايپرالاستيك خطي , رفتار نرخ كرنش هاي بالا , بهينه سازي
استاد داور :
محمد مشايخي، صالح اكبرزاده
تاريخ ورود اطلاعات :
1398/04/31
رشته تحصيلي :
مهندسي مكانيك
تاريخ ويرايش اطلاعات :
1398/04/31
چكيده انگليسي :
Design of Energy Absorber for Rescuing Including of a High Altitude Drop Self safe Capsule Seyed Alireza Allame Date of Submission 2019 06 29 Department of Mechanical Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language FarsiSupervisor Mohammad Reza Forouzan forouzan@cc iut ac irAbstract Large Forces due to impact such as vehicle crash and dropbox could be reduced by energy absorbers Thedesign of an energy absorber that is consistent with the physical conditions of the problem is capable ofabsorbing high energy and economically feasible is a big challenge for the researchers The purpose of thisproject is to design an energy absorber for the fall of a simple example of a human containing capsule Thisdesign includes type material geometric dimensions and absorbent layout To this end the use of elastomericcables to absorb energy has been studied as a new idea Among the studied elastomers thermoplastic polyurethane was more suitable for energy absorption thanother elastomers In the following a linear visco hyperelastic model was selected to express the behavior ofmaterial with strain rate dependency at the high strain rate conditions The tensile test was used to obtainmaterial behavior at low strain rates and at high strain rates tensile weight drop test was used The data oftensile weight drop test was extracted with image processing method There was no possibility to directly extract the coefficients of the material model from experimental data For this reason tensile test and weight drop test were simulated by finite element method in Abaqus software and the coefficients of the material model were optimized so that the simulation results match the experimentdata of the test The optimization was performed using Isight and Hooke Jeeves optimization method Tosimplify the optimization process hyperelastic coefficients were first optimized using the tensile test and atthe next step taking into account the tensile test and tensile weight drop test data simultaneously the linearviscoelastic coefficients were optimized The verification of the model was carried out using the weightweight drop test data at a lower elevation the maximum displacement was estimated with error of about 11 Finally the drop of the simplified human capsule model was simulated in three main directions by thefinite element method in Abaqus software The inner box with human was simulated as a rigid body weighing100 kilograms The constraints that limit the problem are the maximum permitted acceleration for humans ineach direction and the maximum possible displacement with respect to the distance between the outer boxand the inner box The geometric dimensions and layout of the cables were optimized so that the safe heightof the critical state reached its highest level The results showed that if the capsule falls from a height of3 14 m in any directions the human in the capsule will remain safe Keywords Human capsule drop Impact energy absorber Elastomer Linear visco hyperelastic model High strain rate behavior Optimization
استاد راهنما :
محمدرضا فروزان
استاد مشاور :
مهدي جوانبخت
استاد داور :
محمد مشايخي، صالح اكبرزاده
