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In recent years, many scholars have devoted their energies to research remote bearing condition monitoring and on-board bearing fault diagnosis, where big data transmission is usually necessary. However, in some cases, the bandwidth of the wireless communication is limited, and the volume of transmitted data is limited by bandwidth. Therefore, raw data are usually compressed before transmission. Different...
High-speed rotated blades are key mechanical components in turbomachinery. Understanding dynamic characteristics of rotated blades is important for damage detections in turbomachinery. Conventionally contact methods are used for this purpose. However, strain gauges and accelerometers can affect the precision of measurements. So blade tip-timing(BTT) is used to realize non-contact vibration measure...
When faults happen at gas path components of gas turbines, some charged abnormal debris will be generated. An electrostatic sensor can be installed at the tail end of the exhaust pipe to monitor the abnormal debris online and further indicate the faults. However, the electrostatic sensor itself is faced with a problem of function failure because of a severe working condition of high temperature and...
Blade tip timing (BTT) is a promising technique for the blade vibration measurement. Since under-sampling is an inherent drawback of BTT measurement, compressed sensing theory which enables the recovery of sparse signals provides a novel method to the reconstruction of BTT signals. Considering the variability of the excitation method and the material of blades under actual working condition, the instantaneous...
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