Microcrack modeling and simulation for nonlinear wave modulation

2016 ◽  
Author(s):  
Sang Eon Lee ◽  
Suyeong Jin ◽  
Jung-Wuk Hong
Keyword(s):  
Modeling And Simulation ◽  
Nonlinear Wave ◽  
Wave Modulation

Effects of Landau Damping on Nonlinear Wave Modulation in Plasma

1972 ◽  
Vol 33 (1) ◽  
pp. 198-205 ◽  
Author(s):  
Heiji Sanuki ◽  
Katsuya Shimizu ◽  
Jiro Todoroki
Keyword(s):  
Nonlinear Wave ◽  
Landau Damping ◽  
Wave Modulation

Integrity Diagnosis Method of Bolted Joint Based on Time Fluctuation of Reflection Intensity Caused by Nonlinear Wave Modulation

2014 ◽  
Author(s):  
Takashi Tanaka ◽  
Arata Masuda ◽  
Akira Sone
Keyword(s):  
Nonlinear Wave ◽  
High Frequency ◽  
Low Frequency ◽  
Bolted Joint ◽  
Contact Interface ◽  
Wave Modulation ◽  
Diagnosis Method ◽  
Time Fluctuation ◽  
High Frequency Waves ◽  
Reflection Intensity

This study presents the integrity diagnosis method of the bolted joint based on nonlinear wave modulation. When the structure that has the contact interface is vibrating at low-frequency, the contact interface is tapping and clapping due to low-frequency vibration. In this condition, the scatter characteristics, such as wave transmissivity and reflectivity, of high-frequency waves in vicinity of the contact interface are fluctuated in synchronization with low-frequency excitation because of the contact acoustic nonlinearity. The time fluctuation of reflection intensity, which expresses the reflectivity in the specific location, of high-frequency waves at the contact interface is given as the reflection intensity map which plots time-spatial map. In this paper, experiment using the beam specimen which has single bolted joint is conducted to examine the performance of the evaluation index based on the fluctuation amplitude of reflection intensity.

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