Abstract
Due to planetary movement of planet gears, the vibration signal perceived by a stationary sensor is modulated and difficult to diagnose. This paper proposed a vibration separation methodology compensated by a time-varying transfer function (TVTF-VS), which is a further development of the vibration separation (VS) method in the diagnosis of non-hunting tooth planetary gearboxes. On the basis of VS, multi-teeth VS is proposed to extract and synthesize the meshing signal of a planet gear using a single transducer. Considering the movement regularity of a planetary gearbox, the time-varying transfer function (TVTF) is represented by a generalized expression. The TVTF is constructed using a segment of healthy signal and an evaluation indicator is established to optimize the parameters of the TVTF. The constructed TVTF is applied to overcome the amplitude modulation effect and highlight fault characteristics. After that, experiments with baseline, pitting, and compound localized faults planet gears were conducted on a non-hunting tooth planetary gearbox test rig, respectively. The results demonstrate that incipient failure on a planet gear can be detected effectively, and relative location of the local faults can be determined accurately.
Highlights
Planetary gear transmissions are widely used in industrial and military applications, such as wind turbine [1] and helicopter main rotor [2], mainly because they can provide large torque and speed ratio within a compact space
This paper proposed a new metric called ND6, using the sixth moment normalized by the variance to the third power: ND6 =
This paper presents a planet gear fault diagnosis methodology called vibration separation compensated by a time-varying transfer function (TVTF-VS), which makes the VS
Summary
Planetary gear transmissions are widely used in industrial and military applications, such as wind turbine [1] and helicopter main rotor [2], mainly because they can provide large torque and speed ratio within a compact space. Since planetary gearboxes are usually working under heavy load and tough conditions, the gears are prone to failure, resulting in tooth pitting, spalling, and even cracking. The condition monitoring and fault diagnosis of a planetary gearbox is vital important. In the past few decades, vibration-based analysis techniques have been developed successfully to detect weak fault characteristics and incipient damage in fixed axial gearboxes, but most of these techniques cannot be applied to a planetary gearbox directly. Researchers modified or adapted some techniques to diagnose planetary gearboxes. Kong et al [3]
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