| Presentation | 2016-11-07 Development of piezoelectric transducer system for the measurement of bed load Masatoshi Hayashi, Takuya Kikkawa, Daisuke Koyama, Mami Matsukawa, |
|---|---|
| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | In the field of environmental measurements, robust and simple sensors with no electric power supply are required. For river environments, size distributions of sand and small stones in the river-bed are important factor to prevent river disasters. In this report, a passive piezoelectric sensor for measurement of the particle distribution in flow was investigated. The sensor consists of an aluminum circular plate (diameter: 50 mm; thickness: 2 mm) and an annular piezoelectric transducer (inner radius: 5 mm; outer radius: 10 mm; thickness: 2 mm). Alumina spheres with several diameters ( = 3, 5, and 8 mm) were employed as small particles. When the particles hit the surface of the sensor, the flexural vibration is excited on the circular plate and the electric power is generated through the piezoelectric effect. Two main frequency peaks at 16.3 and 66.7 kHz appeared in the output signal, and the ratio of these two spectrum depended on the particle size. Through the finite element analysis, it was found that these frequencies of 16.3 and 66.7 kHz correspond with the fundamental and third resonance vibration modes. When the particles hit the sensor surface sequentially, the particle sizes could be determined from the short time frequency conversion of the observed voltage waveform. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | Bed load / Determination of particle size / Piezoelectric sensor / Flexural vibration / Frequency spectrum |
| Paper # | US2016-59 |
| Date of Issue | 2016-10-31 (US) |
| Conference Information | |
| Committee | US |
|---|---|
| Conference Date | 2016/11/7(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | |
| Chair | Nobuyuki Endo(Kanagawa Univ.) |
| Vice Chair | Yoichi Itoh(Nihon Univ.) / Minoru Kurosawa(Tokyo Inst. of Tech.) |
| Secretary | Yoichi Itoh(Univ. of Electro-Comm.) / Minoru Kurosawa(Univ. of Toyama) |
| Assistant | Takeshi Morita(Univ. of Tokyo) |
| Paper Information | |
| Registration To | Technical Committee on Ultrasonics |
|---|---|
| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Development of piezoelectric transducer system for the measurement of bed load |
| Sub Title (in English) | |
| Keyword(1) | Bed load |
| Keyword(2) | Determination of particle size |
| Keyword(3) | Piezoelectric sensor |
| Keyword(4) | Flexural vibration |
| Keyword(5) | Frequency spectrum |
| 1st Author's Name | Masatoshi Hayashi |
| 1st Author's Affiliation | Doshisha University(Doshisha Univ.) |
| 2nd Author's Name | Takuya Kikkawa |
| 2nd Author's Affiliation | Doshisha University(Doshisha Univ.) |
| 3rd Author's Name | Daisuke Koyama |
| 3rd Author's Affiliation | Doshisha University(Doshisha Univ.) |
| 4th Author's Name | Mami Matsukawa |
| 4th Author's Affiliation | Doshisha University(Doshisha Univ.) |
| Date | 2016-11-07 |
| Paper # | US2016-59 |
| Volume (vol) | vol.116 |
| Number (no) | US-288 |
| Page | pp.pp.59-62(US), |
| #Pages | 4 |
| Date of Issue | 2016-10-31 (US) |