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Design of a planetary gearbox customized for human-centered robotics Vrije Universiteit Brussel
Although the advent of robots entering our daily lives is slowly becoming a tangible reality, robotic engineers still face significant challenges to solve the complex actuation needs of Human-Centered Robotics (HCR) using available high-ratio, compact robotic gearboxes. Alternative approaches tend to see gearboxes as problematic and propose to cancel (Direct-Drive) or substantially reduce (Quasi-Direct-Drive) gear reduction.
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Failure Mode and Effect Analysis (FMEA)-driven Design of a Planetary Gearbox for Active Wearable Robotics Vrije Universiteit Brussel
Conducting an FMEA for the design of a planetary gear transmission for exoskeletons enables decision making based on the interdependence between design parameters and the device requirements, as well as an early identification of several functional risks. Therefore, the use of FMEAs in the design of wearable robotic devices could contribute to higher design robustness, and ultimately result in a broader acceptance of future active wearable ...
Unconventional Gear Profiles in Planetary Gearboxes Vrije Universiteit Brussel
The power loss of high ratio planetary gear trains (PGTs) is mainly constrained by the meshing efficiency of acting gears in each stage. Such gear wheels, predominantly with involute teeth profiles, work with a meshing efficiency of around 99%. When these gears are used in PGTs with reduction ratios of several hundred to one (500:1), despite their effectiveness, the topological efficiency (overall efficiency) of the gearbox drops to even below ...
Cyclo-non-stationary based bearing diagnostics of planetary gearboxes KU Leuven
Condition monitoring of rotating machinery is a field of intensive research being closely related to the technological evolution in the area of energy, manufacturing and transport. The fault detection and diagnosis of planetary gearbox bearings present an interesting challenge even under steady operating conditions as often the relatively weak bearing signals are masked by other components such as the gear meshing. However, planetary gearboxes ...
Condition Monitoring of Wind Turbine Planetary Gearboxes Under Different Operating Conditions KU Leuven
Digitally enhanced services for wind power could reduce Operations and Maintenance costs as well as the Levelised Cost Of Energy. Therefore, there is a continuous need for advanced monitoring techniques which can exploit the opportunities of Internet of Things and Big Data Analytics. The heart of wind turbines is an epicyclic gearbox and rolling element bearings are often responsible for machinery stops. The vibration signatures of bearings are ...
Cyclostationary-based tools for bearing diagnostics of helicopter planetary gearboxes KU Leuven
The components of a helicopter gearbox are vulnerable to fatigue defects and therefore Health and Usage Monitoring Systems have been developed, focusing towards early, accurate and on time fault detection with limited false alarms and missed detections. The main aim of HUMs is to enhance the helicopters' operational reliability and functionality and to improve flight airworthiness. A plethora of methods have been proposed in order to perform ...
Signal processing informed deep learning for failure detection in a fleet of multi-stage planetary gearboxes with limited knowledge about characteristic frequencies Vrije Universiteit Brussel
Condition monitoring of multi-stage planetary gearboxes is a complex challenge given the fact that gears the large number of rotating subcomponents. Typically, the large number of gears creates many harmonic excitations masking bearing signatures. Different state-of-the-art harmonic removal methods, e.g. cepstrum liftering, are available. Such methods have been shown to be automatable. However, exact characteristic frequency values are not ...
Vibration Based Condition Monitoring of Planetary Gearboxes Operating Under Speed Varying Operating Conditions Based on Cyclo-non-stationary Analysis KU Leuven
Bearing failures not only increase the cost due to production loss and need for repair or replacement, but also threaten the personnel safety. Manufacturers of rotating machinery tend to adopt new health monitoring services, using regular inspections or embedding sensors for health monitoring systems within each unit. Early failure signs of a bearing defect are usually weak compared to other sources of excitation. Furthermore, fault detection of ...