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堰当桂
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3 5 0.1~0.5W/cm²40~80kHz 8W 28~32 khz CFD Abstract Dental plaques often accumulate in the gums and XX. To clean them is a hard work. Some researches about sonic or ultrasonic toothbrust were present recent year. Our research presents a new clean method for whole oral hygiene. That is application of ultrasonic cleaner on oral hygiene. The cavitation was occurred via ultrasonic wave that was launched by transducer in human mouth where water was filled out. We assume the food and microbio detached on teeth were removed via vibration and the aim of entire oral hygiene can be achieved. The intense of ultrasonic wave was keeps between 0.1W/cm² and 0.5W/cm². The frequency was sweeping from 40kHz to 80kHz. This is a new method to keep the oral hygiene and clean fully the plaque on the teeth. It is also a new application of ultrasonic cleaner technique. We plant some plaque on the buttom of and wait it fixed. After some days past we filled some clean water and explore an ultrasonic scaler in it to make cavitation in water. The experiments show that the detached plaque was fully removed. Some variation with the size of plaque was observed. This need more research in future. However the good effect of new method was approved after a series of pioneer experiments. This paper also built some related 3D human oral grids model for CFD simulation of ultrasound field. Thus a distribution of intensity can be observed for judging the clean effect. It helps us the design for transducer and tools. An electronic circuit oscillator sweeping from 40kHz to 80kHz is under testing. Keywords: ultrasonic cleaner, oral hygiene 500W/cm 2 2kW/cm 2 MHz 1W/cm 2 Doppler 1

4 2 (cavitation) µm % 40% 4000 µm 5kHz 0.05W/cm² 10kHz 10kHz 0.05W/cm²100kHz 0.6W/cm²1MHz 60W/cm² 3 0.1W/cm²

5 0.2~0.5 W/cm² 0.5W/cm² 10W/cm² 20~80 khz W/cm² cavitation cavitation 20~80kHz 3cm 0.05~0.4W/cm² 400 (Dental Disclothing solution) D 3 CCD GOM(Gesellschaft für Optische 3

6 Messtechnik) ATOS(Advanced TOpometric Sensor) STL 4 STL ATOS mm mm mm CCD pixel 15 sec mm mm 3 ATOS (a) (a)stl 4 STL PRO-E STAR CD 5 CFD cavitation 20kHz28kHz 0.05W/cm² 0.4W/cm² cavitation 5 4

7 5 (1) (Mapping)(2) (3) (Grid Line) (4) (Grid Clustering)(5) (ultrasonic wave) (longitudinal wave) (wave function) y = Asin( ω t κ x) (1)? = 2p /?(wave number)? (wave length)t? (=2pf) (angular frequency) P = Pmax cos( ωt κ x) (2) P max (Pressure Amplitude) I (intensity) 1 ω I = P max (3) 2 BK B (bulk module)p max P max 2I = BK (4) ω P max = 2I ρb (5)? (density) (x = 0) P = Pmax cos( ωt) (6) (6) (3) P = 2I ρb cosωt (7) (I) (? ) (? B )P max ( 20K~80KHz) (0.05~0.2W/cm 2 ) 3 2 (wall) (pressure boundary) 1. No-Slip Condition 2. 5

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9 1s 2s 3s 4s 5s 6s 7s 8s 9s 10s

10 1.5 ( ) PSoC PZT 1. Finn (1987) 2. (1990) 3. (1998) 4. Norbert R.Malik, Electronic circuits: analysis, simulation, and design, Printice Hall. 5. R.L. Boylestard, L. Nashelsky, Electronic device and circuit theory, 7th edition. 6. S. V. Patankar, Numerical Heat Transfer and Fluid Flow, McGraw-Hill, Tannehill, J. C., Anderson, D. A., and Pletcher, R. H. Computational Fluid Mechanics and Heat Transfer, Taylor and Francis, Abbott, I H and von Doenhoff, A E, Theory of Wing Sections, Including a Summary of Airfoil Data, Dover, N. Y.,

11 Ultrasonic (SCI, Impact Factor >1) 20~80kHz PSoC PWM Cypress PSoC cavitation 9

12 10 93 NSC94 / / /

Thesis for the Master degree in Engineering Research on Negative Pressure Wave Simulation and Signal Processing of Fluid-Conveying Pipeline Leak Candi

U17 10220 UDC624 Thesis for the Master degree in Engineering Research on Negative Pressure Wave Simulation and Signal Processing of Fluid-Conveying Pipeline Leak Candidate:Chen Hao Tutor: Xue Jinghong