An informative frequency band identification framework for gearbox fault diagnosis under time-varying operating conditions

A Novel Intelligent Fault Diagnosis Approach for Critical Rotating Machinery in the Time-frequency Domain

The rotating machinery is a common class of machinery in the industry. The root cause of faults in the rotating machinery is often faulty rolling element bearings. This paper presents a novel technique using artificial neural network learning for automated diagnosis of localized faults in rolling element bearings. The inputs of this technique are a number of features (harmmean and median), whic...

A Stochastic Global Identification Framework for Aerospace Vehicles Operating Under Varying Flight States

In this work, a novel data-based stochastic “global” identification framework is introduced for air vehicles operating under varying flight states and uncertainty. In this context, the term “global” refers to the identification of a model that is capable of representing the system dynamics under any admissible flight state based on data recorded from a sample of these states. The proposed frame...

Planetary gearbox fault diagnosis using an adaptive stochastic resonance method

Planetary gearboxes are widely used in aerospace, automotive and heavy industry applications due to their large transmission ratio, strong load-bearing capacity and high transmission efficiency. The tough operation conditions of heavy duty and intensive impact load may cause gear tooth damage such as fatigue crack and teeth missed etc. The challenging issues in fault diagnosis of planetary gear...

Cepstrum Analysis and Gearbox Fault Diagnosis

Modern Vibration Signal Processing Techniques for Vehicle Gearbox Fault Diagnosis

This paper presents modern vibration signalprocessing techniques for vehicle gearbox fault diagnosis, via the wavelet analysis and the Squared Envelope (SE) technique. The wavelet analysis is regarded as a powerful tool for the detection of sudden changes in non-stationary signals. The Squared Envelope (SE) technique has been extensively used for rolling bearing diagnostics. In the present work...