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http://www.sciencedirect.com/science/article/pii/S0041624X14002947

 

Volume 56, February 2015, Pages 539–544

Cover image

Relationship between second- and third-order acoustic nonlinear parameters in relative measurement

Highlights

We proposed the simplified form of third-order acoustic nonlinear parameter.

We newly derived the relationship between simplified forms of second- and third-order nonlinear parameter.

We experimentally verified this new relationship.


Abstract

The higher-order acoustic nonlinear parameters are considered effective damage indices in the field of nondestructive evaluation (NDE). They are defined by using the displacement amplitudes of the fundamental frequency and the harmonics, which are called the absolute nonlinear parameters. Generally, however, it is difficult to measure the very small displacement amplitudes of high-frequency harmonics. Therefore, the simplified parameters using the detected wave signal amplitudes, which are known as the relative nonlinear parameters, have been widely used, although their applications are limited to the relative comparison of before and after damage of a single material under consistent experimental circumstances. In this paper, in order to make clear the concept of relative parameter, we presented first that the relative ratio of the simplified parameters is identical to that of the absolute parameters when the detected signal amplitudes are linearly proportional to the actual displacement amplitudes with respect to the fundamental frequency and the harmonics. In addition, the new relationship between the relative ratio of simplified second-order parameter and the relative ratio of simplified third-order parameter was derived from the relationship between the absolute second- and third-order parameters. This new relationship was successfully verified based on experimental results obtained from Al 6061-T6 processed for different heat treatment times, where it was confirmed in advance that the PZT detection signal amplitudes at the fundamental frequency and its second- and third-order harmonics were linearly proportional to the displacement amplitudes.


분류 제목 조회 수
International Assessment of Thermal Degradation by Cumulative Variation of Ultrasonic Nonlinear Parameter     4867
International Assessment of Thermal Aging of Aluminum Alloys by Acoustic Nonlinearity Measurement of Surface Acoustic Waves     4554
International Absolute Measurement and Relative Measurement of Ultrasonic Nonlinear Parameter     4948
International Experimental Comparison of Nonlinear Parameters Obtained from Absolute Measurement and Relative Measurement     4275
International Comparison of Ultrasonic Nonlinear Parameters Measured by PZT and LiNbO3 Transducers     4221
International Nanotribological and wetting performance of hierarchical patterns     6396
International Demonstration of Disturbance Propagation and Amplification in Car-Following Situation for Enhancement of Vehicle Platoon System     6917
International Relative Measurement of Acoustic Nonlinear Parameters and Comparison of Sensitivity to Thermal Aging     6735
International Non-contact Measurement of Elastic Modulus by using Laser Ultrasonic     8343
International Relationship between Second- and Third-order Acoustic Nonlinear Parameters in Relative Measurement  image   6891
International Non-Contact Evaluation of Acoustic Nonlinearity of a Laser-Generated Surface Wave in a Plastically Deformed Aluminum Alloy     6482
International Influence of repetitive pulsed laser irradiation on the surface characteristics of an aluminum alloy in the melting regime     6973
International Real-time detection of surface cracks on silicon wafers during laser beam irradiation     7044
Domestic High power CW laser-induced damage of CMOS image sensor     7235
Domestic Measurement of Ultrasonic Nonlinear Parameter by Using Non-Contact Ultrasonic Receiver     7211
Domestic Study on the Nonlinear Electromagnetic Acoustic Resonance Method for the Evaluation of Hidden Damage in a Metallic Material     7178
International Influence of laser beam profiles on the frequency bandwidth of laser-generated surface acoustic waves     6563
International Laser ultrasonic inspection in ablation regime     6630
International Improvement of Crack Sizing Performance by using Nonlinear Ultrasonic Technique     6947
International In-Line Ultrasonic Monitoring for Sediments Stuck on Inner Wall of a Polyvinyl Chloride Pipe     15208
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ISNDE Laboratory
203-2,Engineering Center Annex
Hanyang University,
222 Wangsimni-ro, Seongdong-gu
Seoul 04763, Korea
04763 서울특별시 성동구 왕십리로 222
한양대학교 공업센터 별관 203-2호
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