This paper first calculated the stress distribution of the electromotor axes with the help of the engineering software MSC.Marc. With the theory of welding mechanics and fracture mechanics, the reason for the rupture ...This paper first calculated the stress distribution of the electromotor axes with the help of the engineering software MSC.Marc. With the theory of welding mechanics and fracture mechanics, the reason for the rupture of the electromotor axes was found out, which was caused by the unequal distance from the gravity center to their respective bearings at the two ends. The gravity of the structure with high rotation speed of 2 340 r/min could induce tensile stress at the toe of the fillet weld at end of the ribs. With a fictitious 0. 5 mm crack, the fatigue life of this structure under service conditions was in good agreement with the practical operating life.展开更多
Electromotor on oil platform often has mechanical failures.In order to achieve monitoring and diagnosis of the electromotor,common diagnostic methods of electromotor are summarized first,and then vibration monitoring ...Electromotor on oil platform often has mechanical failures.In order to achieve monitoring and diagnosis of the electromotor,common diagnostic methods of electromotor are summarized first,and then vibration monitoring is regarded as a suitable method for monitoring and diagnosing of mechanical failures by comparing the advantages and disadvantages of each method and characteristics of mechanical faults.At last,the fault frequencies and arrangements of vibration measuring points are analyzed.By using vibration monitoring method,the diagnosis of bearing faults of electromotor is carried out.The results show that the analysis of condition monitoring methods for electromotor is meanning for machine maintenance and repair,and it lays foundation for computerized repair system and resource management system.展开更多
文摘This paper first calculated the stress distribution of the electromotor axes with the help of the engineering software MSC.Marc. With the theory of welding mechanics and fracture mechanics, the reason for the rupture of the electromotor axes was found out, which was caused by the unequal distance from the gravity center to their respective bearings at the two ends. The gravity of the structure with high rotation speed of 2 340 r/min could induce tensile stress at the toe of the fillet weld at end of the ribs. With a fictitious 0. 5 mm crack, the fatigue life of this structure under service conditions was in good agreement with the practical operating life.
文摘Electromotor on oil platform often has mechanical failures.In order to achieve monitoring and diagnosis of the electromotor,common diagnostic methods of electromotor are summarized first,and then vibration monitoring is regarded as a suitable method for monitoring and diagnosing of mechanical failures by comparing the advantages and disadvantages of each method and characteristics of mechanical faults.At last,the fault frequencies and arrangements of vibration measuring points are analyzed.By using vibration monitoring method,the diagnosis of bearing faults of electromotor is carried out.The results show that the analysis of condition monitoring methods for electromotor is meanning for machine maintenance and repair,and it lays foundation for computerized repair system and resource management system.
