6461

6026

كارشناسي ارشد

ساخت و توليد

اصفهان: دانشگاه صنعتي اصفهان، دانشكده مكانيك

1390

ج، 71ص.: مصور، جدول، نمودار

ص.ع. به فارسي و انگليسي

محسن صفوي

محمدرضا فروزان

27/10/90

ناصر نهضت، عليرضا فدائي تهراني

1396/10/12

كتابنامه

مكانيك

مهندسي مكانيك

ID6026

به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي

Design and Simulation of a Cubic Vacuum Vessel for Drying the Transformators of Mobarekeh Steel Complex Amir Mortazavi Zadeh am mo @ yahoo com Department of Mechanical Engineering Isfahan University of Technology Isfahan IranDegree M Sc Language FarsiDr Mohsen Safavi mosafavi@cc iut ac irAbstractIn this research the design of a cubic vacuum vessel is investigated Vacuum vessels are being used in differentfields such as coating medical industries surface engineering etc The design of these vacuum vessels isimportant because a weak design may lead to a disastrous fracture or a very bulky and expensive vessel Thedisplacement equations of a m cubic vessel under vacuum pressure is derived theoretically assumingthat the vessel is made of thin surfaces and the displacements are not large while no rib is included in thedesign The resultant maximum displacement from this method is calculated as m which is not acceptableand shows that the vessel needs to be strengthened using longitudinal and transversal ribs By using ribs ondifferent sides of the vacuum vessel the bending strength is excelled However since the geometry of thestructure would become very complicated and non linear analyzing of the vessel using theoretical equations isvery hard Therefore the FE method is used to investigate the best combination of the rib parameters and vesselbody thickness It has to be noted that in FE simulations since there are different solvers mesh types meshsizes etc the results vary from case to case Therefore when solving a problem with FE method the results haveto be verified The problem that arises however is that our current vacuum vessel is in the design phase andtherefore the FE results can not be verified with experimental results To solve this problem a cubic vacuumvessel which is located in Isfahan Optic Complex is investigated and the experimental results are derived Inorder to do this the displacements of points are measured under the vacuum condition Although thedimensions of this vessel are different from our vessel it can be used to verify the FE solution of our problem This vessel is simulated in ABAQUS and the results are in a good agreement with those achieved from theexperimental tests The m vacuum vessel is simulated in ABAQUS with different combinations of ribheight rib lay out and vessel body thickness The FE parameters are chosen to be the same as those used in theprevious phase The design criteria is based on three facts the minimum weight of the structure the stresses anddisplacements that have to be in the allowable range The safety factor is chosen to be and the maximumdisplacement has to be mm as indicated in the literature Five different vessels are investigated using FEmethod The results showed that although the reduction of the vessel body thickness increases the stress anddisplacement the amount of the weight increase is more crucial The increase in the rib s height also affects thedisplacement amount significantly Model is selected as the optimum vessel in the sense of stress strain andweight Key words Cubic vacuum vessel ribs FE simulation

محسن صفوي

محمدرضا فروزان

ناصر نهضت، عليرضا فدائي تهراني