SIDEBAND EXTRACTION ON THE VIBRATION POWER SPECTRA FOR THE TRACTION GEARBOXES OF ELECTRIC TRAINS
Journal Title: Збірник наукових праць Українського державного університету залізничного транспорту - Year 2018, Vol 179, Issue 13
Abstract
The paper deals with the time-synchronous averaging technique of vibration signals for extraction of the features of the technical state of electric train traction gearboxes. Simulation of the vibration of the faultless gear mesh, and gearwheel with a cracked tooth and strong deterministic component was carried out. The rotation frequencies of gearwheel and pinion, and the mesh frequency are clear visible on the vibration power spectrum. Taking into account the poor visibility of the sidebands around mesh frequency on the power spectra, the time-synchronous averaging technique enhances the sidebands, the width of which corresponds to the gearwheel rotation frequency and influences weakening of the sidebands of the faultless pinion. During the experimental research the traction gearbox vibration of electric train was acquired on the test bench in a depot, and the calculated power spectrum has not identified sidebands and mesh frequency. After the time-synchronous average within 18 revolutions for the pinion and gearwheel frequency, the vibration power spectra were acquired. The time-synchronous average technique eliminates random and non-synchronous components while keeping the frequency components that are synchronous to the rotating frequency of the pinion and gearwheel of the traction gearbox. On the vibration power spectra in the vicinity of the mesh frequency the strong sidebands are visible, and they do not coincide with the previously calculated rotation frequencies, which means the absence of gearwheel faults. At the vibration power spectrum for the pinion there are six sidebands in the vicinity of the meshing frequency that coincide with the previously calculated pinion rotation frequencies, which means the presence of localized or distributed faults for the pinion. Disassembling of the traction gearbox shows a crack of the rolling bearing inner race and faultless state of the gear mesh. It was established that the sensitivity of the time-synchronous average technique makes it possible to identify not only localized faults extraction but also distributed faults such as eccentricity and misalignment of the pinion shaft through the modulation of the sidebands on vibration power spectra of the gearwheel.
Authors and Affiliations
Serhii Mykhalkiv, Vladyslav Bulba, Andrii Khodakivskyi
Keywords
Related Articles
- EP ID EP415275
- DOI 10.18664/1994-7852.179.2018.147711
- Views 38
- Downloads 0
FEATURES OF DIAGNOSTIC CHARACTER APPEARANCE REGARDING THE TECHNICAL CONDITIONS OF REDUCTION GEAR FOR PASSENGER CAR
The article to determine the technical condition of reduction gear passenger wagons the mathematical model of vibration that allows to detect the early stages of the birth defects. Using a mathematical model for the cont...
KINEMATICS OF MOVEMENT OF A WHEEL PAIR AFTER ITS DERAILMENT
The work is devoted to a deep study of the kinematics of a wheeled pair at the derailment of a railroad car. Attention to this subject is increased, since the damage caused by the descent of passenger and freight trains...
CALCULATION OF STRESS-STRAIN STATE OF CABLE SPACE FRAMES
The article presents the calculation of stress-strain state of the cable space frame that consists of space modular elements and flexible rods of the lower belt, which are connected with bolts. The cable space frame is d...
IMPROVING RESOURCE PERFORMANCE BY METRO RAIL WARNING GRINDING
In this work the influence of preventive grinding rails and lubrication treated surfaces on rails underground resource that is determined by the intensity of contact-fatigue defects origin side of the working surface rai...
RESEARCH OF RESISTANCE OF SPIKES AND SCREWS WHILE PULLING FROM WOODEN SLEEPER RESTORED BY POLYMER
On the railways, the main part of wooden sleepers replaced with reinforced concrete. They have longer service lives, provide a constant track width, are less exposed to atmospheric influences and require lower maintenanc...