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Tough working conditions of planetary gearboxes lead gear sets are fault-prone. Then, using condition monitoring and faults diagnosis on planetary gearboxes is urgent. However, due to the epicyclical motion of planet gears, the vibration transmission path between the fix-mounted sensor and the sun gear is time-varying, the conventional synchronous averaging (SA) for the feature extraction of gear...
Planetary gearboxes are widely used in wind turbine, aerospace, marine and other large engineering machines. Then, the sun gear fault diagnosis is important. Due to non-stationary, modulation, and complex transmission paths, the observed vibration is more difficult to analysis. The tradition of time-domain synchronous average (TSA) is invalid for the characteristics extraction of sun gear fault. To...
The vibration signal of fault gear is related to non-stationary property, and the gear fault diagnosis will be seriously interfered by bearing signal and other noise signal. EEMD can adaptive decomposition of the vibration signal into different frequency components, but the precise extraction of useful signal is still a question. In this paper, a double determination criterion is presented to the...
Automated guided vehicle (AGV) is used widely in many industrial applications to transport materials. A long-travel material transport system is designed and controlled in this paper for a unit load AGV to transfer the material pallet from AGV to the load stand and back, including a both-side three-level push-pull load-transfer mechanism and a programmable logic controller (PLC). AGV follows the path...
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