Planetary Gear Fault Diagnosis Based on An Instantaneous Angular Speed Measurement System With a Dual Detector Setup

Abstract

Planetary Gearbox (PG) is widely used in many vital transmission systems with the advantages such as high power-weight ratio and high load capacity. To maintain the performance of these system, extensive attentions are paid in the vibration signal analysis for early fault detection and diagnosis of PGs. However, vibration signals are less accurate as they severely influenced by multi-interfaces energy dissipation and varying transmission paths. In contrast, Instantaneous Angular Speed (IAS) is directly related to the gear dynamics and free from the path varying effect. This paper evaluates the performance of an improved IAS measurement system to diagnose PG faults, in which a dual detector setup is adopted to suppress IAS errors caused by the setting parameters and encoder errors. Firstly, a PG dynamic model is established to simulate IAS responses from a PG with local faults on sun and planet gears. Secondly, the noise level of the demodulated IAS is studied under different system parameter configurations. Subsequently, a dual detector self-denoising method is developed to suppress the false IAS caused by encoder errors. Finally, the performance of proposed IAS measurement system is evaluated based on an industrial PG with sun and planet faults. Experimental results show PG faults can be effectively diagnosed from the simple IAS order spectra, indicating that the proposed IAS measurement system is a more promising and yet lower costing approach to monitor rotating machines.INDEX TERMS Planetary gear, fault diagnosis, dual detector; instantaneous angular speed, encoder error suppression.

An encoder signal-based approach for low-speed planetary gearbox fault diagnosis

“…Equation ( 18) can be rewritten as following by differentiating equation (18) with respect to E and setting to zero:…”

“…Miao et al [17] put forward a sparsity-oriented variational mode decomposition for gearbox fault identification. To attenuate the noise and interference of measurement, Zeng et al [18] developed a dual detector self-denoising method for identifying the gear faults.…”

Vibration Feature Evaluation of the Motor-Gear System with Gear Tooth Crack and Rotor Bar Error

“…The induction motor connected the planetary gear system with flexible coupling is shown in figure 3, which is primitively built to verify the dual detector IAS (Instantaneous Angular Speed) based diagnosing method of gear faults such as partially broken sun gear or planet gear tooth in the PG2 [28,29]. The test rig is driven by an 11kW AC motor (Brook Crompton) and the power is transmitted to the 85kW DC generator (STM power transmission Ltd.) by the back to back installed planetary gear boxes with transmission ration of 5.77 (PG1) and 7.2 (PG2) respectively.…”

Parameter detection for surface acoustic wave filter based on image processing

“…In 2018, in-process optical measurement method based on using of dual coolant displacing media is studied by Gao et al [9], which uses an air and liquid phase together to resist coolant and to achieve in-process measurement, the relative error of profile measurement under coolant conditions can be as small as 0.1%. In 2020, Zeng et al [10] evaluated the performance of an improved IAS measurement system to diagnose PG faults, in which a dual detector setup is adopted to suppress IAS errors caused by the setting parameters and encoder errors. In 2021, Tadano [11] proposed a new method that uses compressed-air discharge for volume measurement of pneumatic pressure vessels which achieve accurate and high-fidelity volume measurement and do not cause damage to the surfaces of the vessel.…”