Acoustic Transducer Compact Low-Frequency Emission
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Solution Overview
Problem
Conventional acoustic transducers face challenges in generating low-frequency acoustic emissions without increasing their size, as larger diameters or longer lengths are required to achieve lower resonance frequencies, which is impractical due to hydraulic pressure and waterproof structure constraints.
Innovation Solution
The acoustic transducer design incorporates a plurality of bending vibration modules with support members and end plates featuring open apertures and cutout portions, allowing for a zigzag structure that extends the water column resonance length without enlarging the device, enabling low-frequency acoustic emissions through a combination of bending and water column resonances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the diameter or length of the acoustic transducer is increased to achieve lower resonance frequencies, then the low-frequency acoustic emission capability is improved, but the device size increases which is impractical due to hydraulic pressure and waterproof structure constraints
Solution Approach 1:
The patent transforms the water column from a straight vertical configuration to a folded configuration using support members with cutout portions. This dimensional transformation allows the water column to achieve a longer resonance length (L) while maintaining a compact transducer diameter (D), effectively resolving the contradiction between low-frequency capability and device size by utilizing spatial folding in the radial dimension
Solution Approach 2:
The support members are positioned within the transducer structure, with cutout portions that allow the water column to extend through them. The bending vibration modules are arranged around the support members, creating a nested configuration where the water column path is folded back on itself multiple times within the transducer's radial space, achieving long resonance length without increasing overall diameter
2Volume of moving object
If bending vibration modules are arranged in a compact cylindrical configuration, then the device maintains a small size suitable for hydraulic pressure environments, but the water column resonance length is limited by the transducer's physical dimensions
Solution Approach 1:
The support members extend radially from the central axis to the inner surface of the cylindrical arrangement, and their cutout portions create a folded water column path that utilizes the radial dimension. This allows the water column to achieve a resonance length L that is multiple times the transducer diameter D, effectively decoupling the resonance length from the physical transducer dimensions
Solution Approach 2:
The water column is segmented into multiple sections by the support members with cutout portions. Each segment contributes to the overall resonance length, and the folded configuration creates multiple reflection points that extend the effective acoustic path without requiring a longer physical transducer structure
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design allows for the generation of low-frequency acoustic emissions with a longer water column resonance length than the transducer's physical length, widening the frequency band and maintaining a compact size, thus overcoming the limitations of conventional transducers.
Implementation Method 1
at least one bending vibrator that is made of at least one plate-shaped piezoelectric vibrator
Implementation Method 2
Bending vibration module 101 has waterproof structure 110. The respective bending vibration modules 101 are repeatedly bent back and forth in the direction of thickness of bending vibration module 101 to thereby emit sound to the surrounding liquid
Implementation Method 3
further emits sound to the outside by the use of the resonance of a water column of the liquid
Data Source
AI summary
There is provided an acoustic transducer which is reduced in size and which can generate an acoustic emission having a low frequency. The acoustic transducer of the present invention includes: a plurality of bending vibration modules 7 each of which is constructed of at least one bending vibrator made of at least one plate-shaped piezoelectric vibrator and at least one vibration plate; a plurality of support members 9 each of which supports each of bending vibration modules 7; and end plates which close both end portions of the acoustic transducer. The plurality of bending vibration modules 7 are arranged in a shape of a cylinder. Each of support members 9 is extended radially from the center of bending vibration modules 7 that are arranged in a shape of a cylinder and is joined to an end portion of each of the vibration plates of bending vibration modules 7 adjacent to each other. Further, a part of support members 9 has a cutout portion formed at an end portion thereof. The end plates have open apertures 4 formed therein respectively, open aperture 4 being passed through the end plate. Open aperture 4 communicates with the other open aperture 4 via acoustic emission generation part 21 and cutout portion 20, acoustic emission generation part 21 being constructed of two adjacent support members 9 and bending vibration module 7.