The Experts below are selected from a list of 21 Experts worldwide ranked by ideXlab platform
Y. Guo - One of the best experts on this subject based on the ideXlab platform.
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An Integrated Approach Using Condition Monitoring and Modeling to Investigate Wind Turbine Gearbox Design
Volume 9: Oil and Gas Applications; Supercritical CO2 Power Cycles; Wind Energy, 2015Co-Authors: S. Sheng, Y. GuoAbstract:Vibration-based condition monitoring (CM) of geared utility-scale turbine drivetrains has been used by the wind industry to help improve operation and maintenance (O&M) practices, increase turbine availability, and reduce O&M cost. This study is a new endeavor that integrates the vibration-based CM technique with wind turbine gearbox modeling to investigate various gearbox design options. A team of researchers performed vibration-based CM measurements on a damaged wind turbine gearbox with a classic configuration, (i.e., one planetary stage and two parallel stages). We observed that the acceleration amplitudes around the first-order sidebands of the intermediate stage gear set meshing frequency were much lower than that measured at the high-speed gear set, and similar difference was also observed in a healthy gearbox. One factor for a reduction at the intermediate stage gear set is hypothesized to be the soft sun-spline configuration in the test gearbox. To evaluate this hypothesis, a multibody dynamic model of the healthy test gearbox was first developed and validated. Relative percent difference of the first-order sidebands — of the high-speed and intermediate stage gear-meshing frequencies — in the soft and the rigid sun spline configurations were compared. The results verified that the soft sun-spline configuration can reduce the sidebands of the intermediate stage gear set and also the Locating Bearing loads. The study demonstrates that combining vibration-based CM with appropriate modeling can provide insights for evaluating different wind turbine gearbox design options.© 2015 ASME
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Integrated Approach Using Condition Monitoring and Modeling to Investigate Wind Turbine Gearbox Design: Preprint
2015Co-Authors: S. Sheng, Y. GuoAbstract:Vibration-based condition monitoring (CM) of geared utility-scale turbine drivetrains has been used by the wind industry to help improve operation and maintenance (O&M) practices, increase turbine availability, and reduce O&M cost. This study is a new endeavor that integrates the vibration-based CM technique with wind turbine gearbox modeling to investigate various gearbox design options. A teamof researchers performed vibration-based CM measurements on a damaged wind turbine gearbox with a classic configuration, (i.e., one planetary stage and two parallel stages). We observed that the acceleration amplitudes around the first-order sidebands of the intermediate stage gear set meshing frequency were much lower than that measured at the high-speed gear set, and similar difference wasalso observed in a healthy gearbox. One factor for a reduction at the intermediate stage gear set is hypothesized to be the soft sun-spline configuration in the test gearbox. To evaluate this hypothesis, a multibody dynamic model of the healthy test gearbox was first developed and validated. Relative percent difference of the first-order sidebands--of the high-speed and intermediate stagegear-meshing frequencies--in the soft and the rigid sun spline configurations were compared. The results verified that the soft sun-spline configuration can reduce the sidebands of the intermediate stage gear set andmore » also the Locating Bearing loads. The study demonstrates that combining vibration-based CM with appropriate modeling can provide insights for evaluating different wind turbinegearbox design options.« less
S. Sheng - One of the best experts on this subject based on the ideXlab platform.
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An Integrated Approach Using Condition Monitoring and Modeling to Investigate Wind Turbine Gearbox Design
Volume 9: Oil and Gas Applications; Supercritical CO2 Power Cycles; Wind Energy, 2015Co-Authors: S. Sheng, Y. GuoAbstract:Vibration-based condition monitoring (CM) of geared utility-scale turbine drivetrains has been used by the wind industry to help improve operation and maintenance (O&M) practices, increase turbine availability, and reduce O&M cost. This study is a new endeavor that integrates the vibration-based CM technique with wind turbine gearbox modeling to investigate various gearbox design options. A team of researchers performed vibration-based CM measurements on a damaged wind turbine gearbox with a classic configuration, (i.e., one planetary stage and two parallel stages). We observed that the acceleration amplitudes around the first-order sidebands of the intermediate stage gear set meshing frequency were much lower than that measured at the high-speed gear set, and similar difference was also observed in a healthy gearbox. One factor for a reduction at the intermediate stage gear set is hypothesized to be the soft sun-spline configuration in the test gearbox. To evaluate this hypothesis, a multibody dynamic model of the healthy test gearbox was first developed and validated. Relative percent difference of the first-order sidebands — of the high-speed and intermediate stage gear-meshing frequencies — in the soft and the rigid sun spline configurations were compared. The results verified that the soft sun-spline configuration can reduce the sidebands of the intermediate stage gear set and also the Locating Bearing loads. The study demonstrates that combining vibration-based CM with appropriate modeling can provide insights for evaluating different wind turbine gearbox design options.© 2015 ASME
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Integrated Approach Using Condition Monitoring and Modeling to Investigate Wind Turbine Gearbox Design: Preprint
2015Co-Authors: S. Sheng, Y. GuoAbstract:Vibration-based condition monitoring (CM) of geared utility-scale turbine drivetrains has been used by the wind industry to help improve operation and maintenance (O&M) practices, increase turbine availability, and reduce O&M cost. This study is a new endeavor that integrates the vibration-based CM technique with wind turbine gearbox modeling to investigate various gearbox design options. A teamof researchers performed vibration-based CM measurements on a damaged wind turbine gearbox with a classic configuration, (i.e., one planetary stage and two parallel stages). We observed that the acceleration amplitudes around the first-order sidebands of the intermediate stage gear set meshing frequency were much lower than that measured at the high-speed gear set, and similar difference wasalso observed in a healthy gearbox. One factor for a reduction at the intermediate stage gear set is hypothesized to be the soft sun-spline configuration in the test gearbox. To evaluate this hypothesis, a multibody dynamic model of the healthy test gearbox was first developed and validated. Relative percent difference of the first-order sidebands--of the high-speed and intermediate stagegear-meshing frequencies--in the soft and the rigid sun spline configurations were compared. The results verified that the soft sun-spline configuration can reduce the sidebands of the intermediate stage gear set andmore » also the Locating Bearing loads. The study demonstrates that combining vibration-based CM with appropriate modeling can provide insights for evaluating different wind turbinegearbox design options.« less
Y. Seetharama Rao - One of the best experts on this subject based on the ideXlab platform.
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Fault Diagnosis of a Double-Row Spherical Roller Bearing for Induction Motor Using Vibration Monitoring Technique
Journal of Failure Analysis and Prevention, 2019Co-Authors: Devarabhotla Sai Chandra, Y. Seetharama RaoAbstract:Vibration monitoring techniques employing sophisticated instruments are widely used in industries for regular inspection and diagnosis of the health condition of rotating machinery. This paper discusses fault diagnosis of the spherical roller Bearing for a 630-kW induction motor in a local industry through vibration monitoring technique using a fast Fourier transform analyzer. The main attraction of this technique is that it can be performed even while the equipment is in normal working condition, thus saving precious downtime and avoiding production loss. Accelerometer sensors are kept on drive and non-drive ends of the motor. Vibration data on motor housing are collected in the triaxial direction in the form of amplitude, spectrum and time waveform signals in full-load and no-load conditions. These signals are analyzed and faults identified from the vibration characteristics. From the data, it is found that the dominating amplitude peaks have appeared in the axial direction at 3960 cpm which is matching with harmonic frequencies of motor RPM. Theoretical calculations were also performed to find the Bearing fault frequencies, and it is observed that the vibration readings are matching with sub-harmonics of Bearing ball pass frequency of outer race. These investigations and calculations help the maintenance personnel in Locating Bearing faults and also in detecting the exact cause that leads to Bearing deterioration so that a suitable remedy can be suggested, tested and implemented.
Devarabhotla Sai Chandra - One of the best experts on this subject based on the ideXlab platform.
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Fault Diagnosis of a Double-Row Spherical Roller Bearing for Induction Motor Using Vibration Monitoring Technique
Journal of Failure Analysis and Prevention, 2019Co-Authors: Devarabhotla Sai Chandra, Y. Seetharama RaoAbstract:Vibration monitoring techniques employing sophisticated instruments are widely used in industries for regular inspection and diagnosis of the health condition of rotating machinery. This paper discusses fault diagnosis of the spherical roller Bearing for a 630-kW induction motor in a local industry through vibration monitoring technique using a fast Fourier transform analyzer. The main attraction of this technique is that it can be performed even while the equipment is in normal working condition, thus saving precious downtime and avoiding production loss. Accelerometer sensors are kept on drive and non-drive ends of the motor. Vibration data on motor housing are collected in the triaxial direction in the form of amplitude, spectrum and time waveform signals in full-load and no-load conditions. These signals are analyzed and faults identified from the vibration characteristics. From the data, it is found that the dominating amplitude peaks have appeared in the axial direction at 3960 cpm which is matching with harmonic frequencies of motor RPM. Theoretical calculations were also performed to find the Bearing fault frequencies, and it is observed that the vibration readings are matching with sub-harmonics of Bearing ball pass frequency of outer race. These investigations and calculations help the maintenance personnel in Locating Bearing faults and also in detecting the exact cause that leads to Bearing deterioration so that a suitable remedy can be suggested, tested and implemented.
Patrick De Baets - One of the best experts on this subject based on the ideXlab platform.
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Investigation of a failed axle of a reduction gearbox
Engineering Failure Analysis, 2007Co-Authors: Wouter Ost, Patrick De Baets, Jan QuintelierAbstract:Abstract After 11,300 h of operation, one of the axles of the reduction gearbox of the hoist mechanism of a dockside crane failed due to the propagation of a fatigue crack. The axle contained two gears, the largest of which was mounted swith a key, while the smallest gear was an integral part of the axle. On both ends of the axle a Bearing was mounted: one cylindrical Bearing and one spherical roller Bearing (Locating Bearing). The axle was made from 17CrNiMo6 steel, and the machined gear teeth were case carburised. The failure of the axle occurred in the middle between both Bearings of the axle, on a non-contacting part of the gear machined on the axle. During visual inspection striations were observed on the fracture surface and three separate crack initiation zones could be observed on three neighbouring gear teeth. The ratio of final fracture versus fatigue fracture was low, indicating a low nominal stress on the axle. The three initiation sites were investigated with optical microscopy and SEM, and clear indications of a ductile overload fracture were found. In an etched longitudinal section of one of the gear teeth where initiation took place several cracks could be observed in the hardened case of the tooth. The hardness at the initiation site was found to be 777 HV, while the hardness at the final fracture (diametric position relative to the initiation of the crack) was found to be lower, namely 722 HV. It was concluded that at the initiation site during the case carburisation quenching cracks were formed, which then propagated through the whole section of the axle under relatively low operation load.
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Failure analysis of the deep groove ball Bearings of an electric motor
Engineering Failure Analysis, 2005Co-Authors: Wouter Ost, Patrick De BaetsAbstract:Abstract The deep groove ball Bearings of an electric motor, driving an oil-injected compressor, were periodically monitored for vibrations. The ball Bearings were replaced when before the expected lifetime of the Bearing the measured vibration exceeded the tolerated level. The Bearing on the axle side of the motor was the Locating Bearing while the ball Bearing of the fan side (where the fan of the electric motor was placed) was mounted as a (spring-loaded) floating Bearing. The outer rings of the fan side Bearing showed signs of fretting wear. The outer ring of both Bearings was ground through to disassemble the Bearings. Visual inspection, optical microscopy and scanning electron microscopy of the raceways indicated that the Bearings were subjected to an axial load in the range of the permissible axial load, but for each Bearing in a different direction. The placement of the wear marks on the raceways of both Bearings indicated an axial loading from the inside towards the outside of the electric motor. Also the wear marks on the raceways of both ball Bearings showed the typical washboard pattern of the passage of electric current >0.5 A, although the rotor was already equipped with a grounding brush on the non-drive side. While replacing the deep groove ball Bearing by a cylindrical roller Bearing can easily prevent the fretting wear on the fan side Bearing, the origin of the Bearing currents merits further investigation.