Condition monitoring of gearboxes using synchronously averaged electric motor signals

Vibroacoustic study of powertrains operated in changing conditions by means of order tracking analysis

“…These approaches typically involve synchronous diagnostic signal sampling, where the sampling frequency depends on the rotational speed signal of the machine being examined. Recently, diagnostics methods have been developed which involve synchronising diagnostic signals with rotational speed by means of subsampling methods [4,8,11], the Gabor transform [12,14] or tacholess order tracking analysis [17]. This paper focuses on the development of a method for evaluating the technical condition of powertrains, based on an order tracking analysis which also takes into account both rotational speed variaPAwlik P, lePiArczyk D, DuDek r, Ottewill Jr, rzeszuciński P, wóJcik M, tkAczyk A. Vibroacoustic study of powertrains operated in changing conditions by means of order tracking analysis.…”

Planetary gearbox torsional vibration effects on wound rotor induction generator electrical signatures

“…The majority of studies presented up to now are mostly devoted to the classical gearbox configurations such as spur and helical ones [8]- [11]. Recently, studies concerning the effects of planetary gearboxes torsional vibration on permanent magnetic motor current signatures have been presented [7].…”

Gear fault diagnosis by motor current analysis: application to industrial cases

“…First works were focussed on motor fault diagnosis such as broken rotor bars or eccentricity faults [2]. Recent works are considering more challenging faults such as bearing faults [3][4] or even gear faults in the driven gearbox [5][6][7]. This task is of great interest in applications where the mechanical system is not easily accessible for traditional vibration measurements, eg.…”

“…In [6] it was proposed to synchronously average the stator current space-vector amplitude with the rotation of each gear in the driven gearbox. The method was applied to a test bench with a two-stage reduction gearbox where a fault was created on one tooth of the output gear.…”