Parametric Acoustic Horn Design for Consistent Beamwidth
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Solution Overview
Problem
Existing acoustic horns face challenges in maintaining consistent beamwidth across frequencies, leading to irregular frequency response and alignment issues in arrays, as traditional designs rely on diffraction slots or empirical methods that result in performance degradation.
Innovation Solution
A method involving a parametric model of the sound waveguide surface with input parameters optimized to achieve a frequency-dependent spatial distribution, using simulation and objective functions to design an acoustic horn with a predetermined beamwidth variation or constant beamwidth across frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If traditional acoustic horn designs use diffraction slots or empirical methods to control beamwidth, then beamwidth control is achieved, but frequency response becomes irregular and performance degrades
Solution Approach 1:
The patent applies parameter changes by systematically varying horn geometric parameters (cross-sectional area, wall angles, curvature radii) to optimize beamwidth control across frequency bands. Instead of using diffraction slots, the invention modifies the continuous geometric parameters of the horn walls to achieve desired spatial distribution characteristics while maintaining smooth frequency response.
Solution Approach 2:
The patent replaces the mechanical diffraction slot structure with a computational design approach using objective functions and simulation. The spatial distribution control is achieved through mathematical optimization of horn geometry rather than physical diffraction elements, eliminating the harmful reflections and coloration caused by traditional mechanical solutions.
2Ease of manufacture
If acoustic horns are designed with fixed geometric parameters, then manufacturing is simplified, but beamwidth varies with frequency causing alignment issues in arrays
Solution Approach 1:
The patent introduces dynamic optimization by using objective functions that evaluate beamwidth performance across multiple frequency points. The horn geometry is designed to dynamically adapt its effective beamwidth characteristics across frequencies through carefully controlled variations in wall profiles, allowing consistent spatial distribution despite fixed physical dimensions.
Solution Approach 2:
The patent applies preliminary action by pre-optimizing horn geometric parameters using computational models and objective functions before manufacturing. The design process systematically evaluates and adjusts parameters to predict and ensure consistent beamwidth performance across the operating frequency range, preventing alignment issues in arrays before the horns are built.
Data Source
AI summary
A method for designing a sound waveguide surface is described. The method includes the steps of forming a parametric model of the sound waveguide surface where the parametric model has at least one input parameter and then simulating a sound field that is formed by the sound waveguide surface. A frequency dependent spatial distribution measure is then determined for the sound field associated with the sound waveguide surface and the at least one input parameter is varied to change the sound waveguide surface to adjust the value of the frequency dependent spatial distribution measure.