Eric Bechhoefer

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In comparison with a traditional planetary gearbox, the split torque gearbox (STG) potentially offers lower weight, increased reliability, and improved efficiency. These benefits have driven helicopter OEMs to develop products using STG. However, the effect of multiple gears meshing simultaneously with the central gear and a large number of synchronous(More)
In recent years, acoustic emission (AE) sensors and AE-based techniques have been developed and tested for gearbox fault diagnosis. In general, AE-based techniques require much higher sampling rates than vibration analysis-based techniques for gearbox fault diagnosis. Therefore, it is questionable whether an AE-based technique would give a better or at(More)
When compared with a traditional planetary gearbox, the split torque gearbox (STG) potentially offers lower weight, increased reliability, and improved efficiency. These benefits have driven the helicopter manufacturing community to develop products using the STG. However, this may pose a challenge for the current gear analysis methods used in Health and(More)
The requirement for higher energy density transmissions (lower weight) in helicopters has lead to the development of the Split Torque Gearbox (STG) to replace the traditionally planetary gearbox by the drive drain designer. This may pose a challenge for the current gear analysis methods used in Health and Monitoring Systems (HUMS). Gear analysis uses time(More)
A new feature extraction method for gear fault diagnosis and prognosis. eksploatacja i niezawodnosc – Maintenance and reliability 2014; 16 (2): 295–300. Robust features are very critical to track the degradation process of a gear. They are key factors for implementing fault diagnosis and prognosis. This has driven the need in research for extracting good(More)
— Monitoring the health of a helicopter drive train enhances flight safety and reduces operating costs. Health and Usage Management Systems (HUMS) monitor the drive train by using accelerometers to measure component vibration. Algorithms process the time domain vibration data into various condition indicators (CI), which are used to determine component(More)
– In this paper, we develop an integrated prognostics method considering a time-varying operating condition, which integrates physical gear models and sensor data. By taking advantage of stress analysis in finite element modeling (FEM), the degradation process governed by Paris' law can adjust itself immediately to respond to the changes of the operating(More)