Cylindrical Piezoelectric Transducer for Low-Frequency Liquid Radiation
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Solution Overview
Problem
Existing acoustic transducers face challenges in efficiently radiating sound waves at low frequencies and improving acoustic radiation efficiency into liquids, particularly due to limitations in size and waterproof structures that restrict amplitude under high water pressure.
Innovation Solution
The acoustic transducer design incorporates cylindrically arranged bending vibration modules with supporting members that protrude from a central shaft, featuring a unimorph or bimorph structure with plate-type piezoelectric resonators and diaphragms, allowing for alternating deformation and efficient sound wave radiation through the resonance of the water column.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the size of the acoustic transducer is reduced, then it becomes more compact and easier to deploy, but the resonance frequency increases and low frequency sound wave radiation becomes difficult
Solution Approach 1:
The acoustic transducer is divided into multiple bending vibration modules (typically 3-6 modules) arranged around a central shaft. Each module independently generates bending vibration, and their combined effect produces efficient low frequency sound wave radiation from the entire transducer structure, resolving the contradiction between compact size and low frequency radiation capability
Solution Approach 2:
The invention transitions from traditional radial or axial vibration modes to bending vibration mode, where the diaphragms bend in an arc shape during vibration. This dimensional change in vibration pattern allows the transducer to achieve low frequency radiation with a compact structure by utilizing the bending motion of multiple modules rather than requiring a large single-element structure
2Reliability
If waterproof structures are added to protect the transducer in high water pressure environments, then reliability improves, but the amplitude of vibration is restricted and acoustic radiation efficiency decreases
Solution Approach 1:
The transducer is segmented into multiple independent bending vibration modules, each with its own diaphragm and piezoelectric resonator. This segmentation allows the vibration amplitude to be distributed across multiple modules, maintaining high acoustic radiation efficiency even when each individual module operates with restricted amplitude due to waterproof structure constraints
Solution Approach 2:
Multiple bending vibration modules are combined around a central shaft to form a unified acoustic radiation system. The combined vibration effect of all modules produces efficient low frequency sound waves, compensating for the reduced amplitude caused by waterproof structures and maintaining high acoustic radiation efficiency
3Stability of the object's composition
If bending vibration modules are joined together to form a cylindrical structure, then structural stability improves, but flexibility and vibration amplitude are reduced
Solution Approach 1:
The cylindrical structure is segmented into multiple independent bending vibration modules that are joined at their ends. Each module maintains its own vibration characteristics and flexibility, while the modular arrangement provides overall structural stability. The segmentation allows each module to vibrate with sufficient amplitude without being constrained by a rigid continuous structure
Solution Approach 2:
The joining structure between bending vibration modules is designed to be dynamically flexible rather than rigidly fixed. This allows the modules to vibrate with adequate amplitude while maintaining structural integrity and stability during operation, resolving the contradiction between structural stability and vibration flexibility
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 enhances acoustic radiation efficiency across a wide frequency range by maintaining high amplitude and reducing resonance frequency, enabling effective sound wave propagation both from the surface and through the liquid's resonance, even under high water pressure.
Implementation Method 1
bending vibration module (7) that is formed by at least a bending oscillating body (1) with at least a plate type piezoelectric resonator (2) and a diaphragm (3)
Implementation Method 2
the acoustic transducer radiates a sound wave into surrounding liquid or radiates a sound wave by using the resonance of the water column of the liquid inside the cylinder formed by bending vibration modules (101)
Implementation Method 3
enabling effective sound wave propagation both from the surface and through the liquid's resonance
Data Source
AI summary
An acoustic transducer that enables acoustic radiation at a low frequency and that also improves efficiency of the acoustic radiation into liquid is provided. The acoustic transducer according to the present invention includes bending vibration module 7 that is formed by at least one bending oscillating body 1 that has at least one plate type piezoelectric resonator 2 and diaphragm 3, and supporting member 9 for supporting bending vibration module 7. A plurality of bending vibration modules 7 are cylindrically arranged, and supporting members 9 radially protrude from shaft 8 provided at the center of the cylindrically arranged bending vibration modules 7 and are joined with the ends of diaphragms 3 of adjoining bending vibration modules 7.