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Register a new userCauses Analysis of Gear Couplings Failure of Gas Recirculation Fans in Banias Power Station
تحليل أسباب فشل القارنات المسننية لمراوح اعادة تدوير غازات الاحتراق في محطة بانياس الحرارية
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تعتبرُ القارنة المسننة واحدة من القارنات الصناعية ذات التصميم الأصعب بسبب تعقيد توزيع الأحمال بين الأسنان نتيجة انحراف الأعمدة . تهدفُ هذه المقالة الى دراسة أهمية تتويج الأسنان في تحليل أسباب فشل القارنات المسننة لمراوح اعادة تدوير غازات الاحتراق في محطة بانياس الحرارية. تمَّ تحليل اجهادات التماس بين الأسنان المتعشقة في القارنة المسننة, و ذلك لأجل حالتي تماس أحدهما مع تتويج و الأخرى بدون تتويج عند درجة عدم تسامت محددة . لأجل التحليل , اُستُخدِمَ الفولاذ متوسط الكربون كمعدن للقارنة المسننة . استُخدِمت طريقة العناصر المنتهية في عملية النمذجة و التحليل بمساعدة البرنامج ANSYS 14.5, و من ثم تمت مقارنة النتائج مع قيم معادلة هرتز النظرية . إنَّ التوافق الذي أظهرته النتائج بين حسابات ANSYS و هرتز يشير الى دقة النموذج المدروس, و لقد تم التوصل الى أنَّ استخدام الأسنان المستقيمة يؤدي الى تركز كبير للإجهاد على أطرافها عند نقل عزوم الدوران بين الأعمدة غير المتسامتة مقارنةً بالتوزع المتجانس لضغط التماس على سطوح الأسنان المتوجة.
A gear coupling is one of the most difficult couplings to design used in industry , because of the complication for loads distribution between the teeth under misalignment shafts conditions . This paper aims to study the importance of crown to analysis the failure causes of gearcouplings of gas recirculation fans in Banias power station. It presents the stress analysis of mating teeth of gear coupling to find maximum contactstress in its teeth for two situations : crown and straight tooth contact for specialmisalignmentangle. For the analysis,Medium Carbon Steel are used as the material of gear coupling . FEA is done in finite element software ANSYS 14.5. The results obtained from Finite Element Analysis (FEA) are compared with theoretical Hertzian equation values. Both results agree very well. This indicates that the FEM model is accurate . Results show that With straight hub teeth, there is a high concentration of load under misaligned conditions. While Crowned flanks provide optimal load distribution .
References used
WOODRUFF,E.B;LAMMERS,H.B;LAMMERS,T.F. Steam Plant Operation. 8nd. ed., U.S.A ,1968,795
CALISTRAT,M.M.Mechanical Shaft Couplings. CRC Handbook of Lubrication U.S.A. Vol. 11,1983, 565-579
MANCUSO,J.R.Coupling and Joints : Design, Selection, and Application. 2nd. ed., Marcel Dekker, New York U. S. A,1999, 594
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