The high-frequency measurement technique as a tool of defining ultrasonic absorption in thin samples

1975 ◽  
Vol 32 (1) ◽  
pp. K7-K9
Author(s):  
A. I. Agaev ◽  
Z. A. Iskenderzade ◽  
V. D. Faradev
Keyword(s):  
Measurement Technique ◽  
High Frequency ◽  
Frequency Measurement ◽  
Ultrasonic Absorption ◽  
Thin Samples

scholarly journals Gaining Insights in Loading Events for Wind Turbine Drivetrain Prognostics

2020 ◽  
Author(s):  
Pieter-Jan Daems ◽  
Y. Guo ◽  
S. Sheng ◽  
C. Peeters ◽  
P. Guillaume ◽  
...  
Keyword(s):  
High Frequency ◽  
Failure Modes ◽  
Measurement Data ◽  
Wind Farms ◽  
Frequency Measurement ◽  
Operating Conditions ◽  
Failure Data ◽  
The World ◽  
Operations And Maintenance ◽  
History Of

Abstract Wind energy is one of the largest sources of renewable energy in the world. To further reduce the operations and maintenance (O&M) costs of wind farms, it is essential to be able to accurately pinpoint the root causes of different failure modes of interest. An example of such a failure mode that is not yet fully understood is white etching cracks (WEC). This can cause the bearing lifetime to be reduced to 5–10% of its design value. Multiple hypotheses are available in literature concerning its cause. To be able to validate or disprove these hypotheses, it is essential to have historic high-frequency measurement data (e.g., load and vibration levels) available. In time, this will allow linking to the history of the turbine operating data with failure data. This paper discusses the dynamic loading on the turbine during certain events (e.g., emergency stops, run-ups, and during normal operating conditions). By combining the number of specific events that each turbine has seen with the severity of each event, it becomes possible to assess which turbines are most likely to show signs of damage.

scholarly journals High-Frequency Measurement of Ultrasound Using Flexural Ultrasonic Transducers

2018 ◽  
Vol 18 (13) ◽  
pp. 5238-5244 ◽  
Author(s):  
Andrew Feeney ◽  
Lei Kang ◽  
Steve Dixon
Keyword(s):  
High Frequency ◽  
Frequency Measurement ◽  
Ultrasonic Transducers

scholarly journals What do we know about Indonesian tropical lakes? Insights from high frequency measurement

2018 ◽  
Vol 118 ◽  
pp. 012024
Author(s):  
Arianto Budi Santoso ◽  
Endra Triwisesa ◽  
Muh. Fakhrudin ◽  
Eko Harsono ◽  
Hadiid Agita Rustini
Keyword(s):  
High Frequency ◽  
Frequency Measurement ◽  
Tropical Lakes

High-frequency measurement techniques for magnetic cores

1990 ◽  
Vol 5 (1) ◽  
pp. 41-53 ◽  
Author(s):  
V.J. Thottuvelil ◽  
T.G. Wilson ◽  
H.A. Owen
Keyword(s):  
High Frequency ◽  
Measurement Techniques ◽  
Frequency Measurement ◽  
Magnetic Cores

Validation of fish length estimations from a high frequency multi-beam sonar (ARIS) and its utilisation as a field-based measurement technique

2019 ◽  
Vol 218 ◽  
pp. 59-68 ◽  
Author(s):  
Denham Cook ◽  
Karen Middlemiss ◽  
Peter Jaksons ◽  
William Davison ◽  
Alistair Jerrett
Keyword(s):  
Measurement Technique ◽  
High Frequency ◽  
Fish Length
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