Open-Structure Liquid Oscillator with Flexible Wall for Low-Frequency Sound
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Solution Overview
Problem
Existing underwater sound sources face challenges in maintaining structural integrity and pressure compensation, especially at low frequencies, due to encapsulated designs which are costly and inefficient, while open structures lack sufficient sound production efficiency.
Innovation Solution
An open-structured oscillator with a sound-producing element having a rigid layer and a flexible layer, where the flexible layer can vary in distance between surfaces, comprising materials like closed-cell foamed materials, open-cell materials, or honeycomb structures, allowing efficient sound production at low frequencies without separate pressure compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an encapsulated structure is used to maintain structural integrity and pressure compensation, then reliability is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The invention extracts the pressure compensation function from separate complex equipment and integrates it into the flexible layer itself. The flexible layer's ability to compress and expand under pressure differences provides inherent pressure compensation without requiring additional active compensation systems, thereby reducing device complexity while maintaining structural integrity.
Solution Approach 2:
The flexible layer changes its physical parameters (volume, shape, density) in response to pressure changes. By using materials with specific compressibility characteristics, the system automatically adapts to pressure variations, eliminating the need for complex pressure regulation equipment while maintaining reliability.
2Strength
If an encapsulated structure is used to resist external impacts, then strength is improved, but manufacturing cost increases
Solution Approach 1:
The invention replaces rigid encapsulated structures with flexible shells and thin films. The flexible layer, made from materials like elastomers or foamed materials, provides impact resistance through deformation and energy absorption rather than rigid structural support, significantly reducing manufacturing complexity and cost while maintaining strength.
Solution Approach 2:
The sound-producing element uses composite materials combining rigid and flexible components. This allows the structure to achieve both strength for impact resistance and flexibility for pressure compensation, eliminating the need for expensive complex encapsulated designs while maintaining protective capabilities.
3Device complexity
If an open structure is used to simplify the oscillator, then device complexity is reduced, but sound production efficiency at low frequencies deteriorates
Solution Approach 1:
The flexible layer in the open structure acts as a compliant boundary that enhances acoustic radiation efficiency. At low frequencies, the flexible membrane can move more freely than rigid structures, improving sound production efficiency while maintaining the simplicity of the open design without requiring encapsulation.
Solution Approach 2:
The flexible layer's physical parameters (tension, mass, compliance) are optimized to enhance low-frequency sound radiation. By adjusting these parameters, the open structure achieves improved acoustic efficiency across the frequency range, eliminating the trade-off between simplicity and performance.
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
The open-structured oscillator is simple, reliable, and durable, achieving efficient sound production across a wide frequency range (50 to 5000 Hz) without the need for complex pressure compensation, while reducing manufacturing costs and enhancing durability.
Implementation Method 1
an actuator element (1), which oscillates in a reciprocating manner... the actuator element generates a motion in the sound-producing element (2) for producing a sound
Implementation Method 2
The flexible layer advantageously comprises gas the pressure of which varies as sound is produced
Implementation Method 3
a flexible layer (7)... which enables variation in the distance between an outer surface and an inner surface
Data Source
Figure 1~4
AI summary
The invention relates to an oscillator in a liquid. The oscillator in the liquid includes an actuator element (1) oscillating in a reciprocating manner, and a sound-producing element (2) attached to the actuator element (1), whereby the actuator element (1) generates a motion in the sound-producing element (2) for producing a sound. The oscillator is made open, whereby the pressure of liquid acts both on a first surface (4) and on a second surface (5) of the wall of the sound-producing element while the sound source is in the liquid. The material and/or structure of the wall (3) of the sound-producing element is provided to be such that the distance between the first surface (4) and the second surface (5) of the wall varies as sound is produced.