Cross Correlation for Condition Monitoring of Variable Load and Speed Gearboxes

Vibration Sensing technique for monitoring condition of ball/rolling bearings and gearboxes

The paper introduces some details of new hand-held sensor with extended vibration frequency measurement range till 20 kHz. The sensor provides new diagnostics capabilities especially for rolling/ball bearings and gearboxes. It is related to discovering the unknown before behavior of one point contact metal to metal. It is found that traditional transfer function is incorrectly described after r...

Effect of Wind Speed and Load Correlation on ELCC of Wind Turbine Generator

Utilization of wind turbines as economic and green production units, poses new challenges to the power system planners, mainly due to the stochastic nature of the wind, adding a new source of uncertainty to the power system. Different types of distribution and correlation between this random variable and the system load makes conventional method inappropriate for modeling such a correlation. In...

A Real Time Condition Monitoring System for Gears Operating under Variable Load Conditions

Received Jun 9, 2017 Revised Nov 20, 2017 Accepted Dec 11, 2017 Gears are important component of the rotational power transmission system and are largely used in variable load and speed applications. The faults on the gear generate excessive vibration which leads to breakdown of the machine. Sensor based methods could diagnose gear faults but proved to be expensive and have limited applications...

Operational Reliability Assessment of Compressor Gearboxes with Normalized Lifting Wavelet Entropy from Condition Monitoring Information

Classical reliability assessment methods have predominantly focused on probability and statistical theories, which are insufficient in assessing the operational reliability of individual mechanical equipment with time-varying characteristics. A new approach to assess machinery operational reliability with normalized lifting wavelet entropy from condition monitoring information is proposed, whic...

Instantaneous angular speed estimation for multi-stage wind turbine gearboxes