Kyushu University Academic Staff Educational and Research Activities Database
List of Presentations
Ren Kadowaki Last modified date:2018.03.27

Assistant Professor / Department of Mechanical Engineering / Faculty of Engineering


Presentations
1. Kenta Mori, Takumi Inoue, Ren Kadowaki, Kazuhisa Omura, Detecting Small Delamination in Flexible Packages using Coincidence Effect of Air-coupled Ultrasound, The 17th Asian Pacific Vibration Conference, 2017.10.
2. Ren Kadowaki, Naoki Otsubo, Takumi Inoue, Kazuhisa Omura, Liquid Viscosity Evaluation using Ultrasonic Pulse, The 17th Asian Pacific Vibration Conference, 2017.10, The purpose of this study is development of a new viscosity evaluation method. We focus on ultrasonic pulse that is transmitted in the target liquid. The liquid viscosity is evaluated through attenuation of the ultrasonic pulse. As the first step, we tried to evaluate the viscosity of some types of mineral oil, whose viscosity were already known. We observed the two pulses that were transmitted in the mineral oil in a test container as shown in figure 1. Comparing the two reflected pulses in frequency domain, spectra of the attenuation in the oil were obtained. To calculate the viscosity of the oil, the theoretical relationships between the viscosity and the attenuation was essential. We performed a numerical simulation of pulse propagation with a lumped mass model as shown in figure 2. The relationships between the damping coefficients and the attenuation were elucidated from this numerical simulation. The damping coefficients were identified for the simulated pulse to resemble the experimental results in their attenuation. In the results, the oil viscosity that was over 100 mPas was evaluated using the experimental and theoretical results..
3. Proposal of detecting method for small delamination in heat seal of flexible packages using aerial ultrasonic wave.
4. New testing method for viscosity of packaged liquids with ultrasonic pulse.
5. Development of nondestructive diagnostic method for micro-leak defects in heat seal of flexible packages using ultrasonic waves.
6. Study of ultrasonic transmission in diagnosis of bolt loosening using instantaneous frequency of ultrasonic pulse.
7. Three dimensional study of ultrasonic transmission in diagnosis of bolt loosening based on instantaneous frequency of the ultrasonic wave.
8. Development of Evaluation method of slacking Bolt Using Instantaneous Frequency of Ultrasound.
9. Ren Kadowaki, Takumi Inoue, Tatsuya Oda, Takahiro Nakano, New evaluation technique of seal strength of heat sealing with ultrasonic pulse, The 16th Asia Pacific Vibration Conference, 2015.11.
10. Takuya Kishida, Kazumasa Ohama, Takumi Inoue, Ren Kadowaki, Kazuhisa Ohmura, Transverse Motion of the Plate Spring that Automatically Follows the Excitation Frequency, The 16th Asia Pacific Vibration Conference, 2015.11.
11. Evaluation of Slackness of Bolt Using Instantaneous Frequency of Ultrasound by Transmission Method.
12. Analytical Study on Instantaneous Frequency of Complex Ultrasonic Pulse.
13. Numerical analysis of instantaneous frequency of ultrasonic pulse.
14. Experimental Estimation of the Mechanism of the Plate Spring Movement that Automatically Tunes to the Excitation Frequency.