Aerial Ultrasonic Source Using Stripe-Mode Transverse Vibrating Plate with Jutting Driving Point

概要

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Ultrasonic sources using a stripe-mode rectangular transverse vibrating plate have been used as acoustic sources emitting intense acoustic waves in air. Because these sources are based on the resonance of transverse vibration, their electric–acoustic conversion rate is as high as 90%, which is a merit. In this study, a vibrating plate with a unique shape was developed to enhance the effectiveness of acoustic sources. It is called a stripe-mode transverse vibrating plate with a jutting driving point. The advantage of this plate shape is that the acoustic source does not interfere with the emission of acoustic waves since the driving point is outside the plate, and there is no need to distinguish between the front and back sides of the vibrating plate. The conditions effective for driving the stripe-mode transverse vibrating plate were clarified. That is, the length of the side parallel to the node lines of the plate is an odd number times the length between the nodes in the stripe mode, and the length of the side perpendicular is at least 6 times but not a multiple of 3 greater than or equal to 15 times, subtracted by 0.5 times, the length between the nodes. Moreover, the length between the driving point and the edge of the plate is a positive integer with a noninteger value of 0.9.
Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
2009-07-25