3D Passive Radiator Diaphragm for Low Frequency Acoustic Output
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional passive radiators have limited radiating surfaces, requiring large excursions to radiate significant acoustic energy, leading to material failure, non-linearities, and unbalanced enclosure vibrations, especially at low frequencies, and often necessitate complex suspension systems with non-linear behavior.
Innovation Solution
A passive radiator diaphragm with a three-dimensional shape, such as a sphere or cylinder, incorporating a flexible material and a core of porous, compressible material, with a pressure transmission duct to radiate pressure waves, allowing for reduced excursion and balanced force and mass distribution, and optionally including particles for increased mass.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If conventional passive radiators use flat or simple curved surfaces, then the structure is simple, but the radiating surface area is limited requiring large excursions that cause material failure and non-linearities
Solution Approach 1:
The patent transitions from two-dimensional flat or simple curved diaphragms to three-dimensional geometric shapes (spheres, cylinders, polyhedrons). This dimensional change dramatically increases the radiating surface area while maintaining structural integrity and reducing the need for large excursions.
Solution Approach 2:
The patent employs highly curved surfaces including spheres, cylindrical sections, and polyhedral shapes with curved faces. These curved geometries maximize radiating surface area within compact volumes and distribute mechanical stresses more evenly, preventing material failure.
2Power
If conventional passive radiators use large excursions to radiate significant acoustic energy, then acoustic energy radiation is improved, but material failure and non-linearities occur
Solution Approach 1:
By moving to 3D geometries, the radiating surface area increases substantially, allowing the same acoustic power to be radiated with smaller excursions. The volume-to-surface-area ratio optimization enables efficient acoustic radiation without excessive diaphragm travel.
Solution Approach 2:
The patent changes the geometric parameters from 2D to 3D shapes, fundamentally altering the relationship between volume, surface area, and excursion requirements. This parameter change enables high acoustic power output with reduced mechanical stress on materials.
3Power
If conventional passive radiators operate at low frequencies, then bass response is improved, but unbalanced enclosure vibrations and non-linear behavior occur
Solution Approach 1:
The patent segments the diaphragm into multiple geometric faces or zones that can move with different characteristics. This segmentation allows for more uniform distribution of forces and reduces unbalanced vibrations in the enclosure, particularly at low frequencies.
Solution Approach 2:
The patent employs asymmetric geometric configurations and strategic placement of acoustic ports to balance the acoustic radiation pattern. This asymmetry compensation reduces unwanted enclosure vibrations while maintaining strong low frequency output.
4Ease of operation
If conventional passive radiators use complex suspension systems to control motion, then motion control is improved, but non-linear behavior and device complexity increase
Solution Approach 1:
The patent allows the passive radiator diaphragm to move freely without complex suspension systems. The 3D geometric shape itself provides the necessary mechanical constraints and stability, eliminating the need for additional suspension components and their associated non-linearities.
Solution Approach 2:
The patent removes the complex suspension system entirely from the design. The passive radiator operates based on its geometric form and acoustic pressure differential, extracting the motion control function from mechanical suspension to geometric and acoustic principles.
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 solution provides a larger radiating surface area, reducing the need for large excursions, preventing material failure and non-pistonic behavior, and inherently achieving force and mass balance, thus enhancing acoustic energy radiation efficiency and stability.
Implementation Method 1
an acoustic driver radiating pressure waves into the three dimensional volume to cause the diaphragm to expand and contract
Implementation Method 2
a core of a porous, compressible material. The core may be solid. The core may be hollow. The exterior of the core may be adhered to the interior surface of the diaphragm
Data Source
AI summary
A three dimensional acoustic passive radiator diaphragm. A diaphragm a three dimensional volume. An acoustic driver radiates pressure waves into the three dimensional volume to cause the diaphragm to expand and contract. The three dimensional passive radiator may include a core of a porous, compressible material.