Multi-Path Muffler Phase Shifting for Acoustic Wave Attenuation
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Solution Overview
Problem
Traditional mufflers for HVAC compressors are often large and inefficient in attenuating acoustic waves, as they rely on trapping energy through resonances rather than effectively merging out-of-phase waves for destructive interference.
Innovation Solution
The proposed solution involves configuring multiple acoustic paths within a muffler to provide different phase shifts to acoustic waves, allowing them to merge and cancel each other out, utilizing varying lengths, cross-sectional areas, and impedance modifications such as baffles, to create out-of-sync wave portions that attenuate sound effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If traditional resonance-based mufflers are used to attenuate acoustic waves, then sound attenuation is achieved, but the device size becomes large and efficiency is reduced
Solution Approach 1:
The acoustic path is divided into multiple segments with different acoustic impedances (first, second, and optionally third acoustic paths). Each segment provides a different phase shift to the acoustic waves, allowing the waves to become out-of-phase and cancel each other through destructive interference when merged, achieving effective sound attenuation in a compact design
Solution Approach 2:
The patent changes the acoustic impedance parameter along the acoustic path by introducing sections with different cross-sectional areas and configurations. This creates phase shifts in the acoustic waves without requiring large resonance chambers, enabling compact muffler design while maintaining effective sound attenuation
2Object-affected harmful factors
If traditional resonance-based mufflers are used, then sound attenuation is achieved, but the device becomes inefficient in attenuating acoustic waves
Solution Approach 1:
The patent changes the acoustic impedance parameter along the acoustic path by introducing sections with different cross-sectional areas and configurations. This creates phase shifts in the acoustic waves without requiring large resonance chambers, enabling compact muffler design while maintaining effective sound attenuation
3Object-affected harmful factors
If multiple acoustic paths with different phase shifts are used, then destructive interference and sound attenuation are achieved, but the device complexity increases
Solution Approach 1:
Multiple acoustic paths with different phase shifts are merged into a single common path where the out-of-phase acoustic waves combine and cancel each other through destructive interference. This merging approach achieves effective sound attenuation while keeping the overall structure relatively simple and compact
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 approach results in a more compact and easily modifiable muffler design that significantly reduces operational sound by ensuring destructive interference of acoustic waves, offering improved sound attenuation compared to traditional designs.
Implementation Method 1
the first acoustic path and the second acoustic path are configured to provide different phase shifts to acoustic waves
Implementation Method 2
the acoustic waves can be attenuated when merged
Implementation Method 3
the first acoustic path and the second acoustic path may have different lengths, which may help provide different acoustic impedance when an acoustic wave passes through the first and second acoustic paths
Data Source
AI summary
Apparatuses and methods to attenuate acoustic waves are provided. The method may include shifting the phases of a plurality of portions of the acoustic waves and merging the portions of the acoustic waves after phase shifting. Because, for example, the phases of the acoustic waves may be out-of-sync when being merged, the acoustic waves may be attenuated. A muffler incorporating the method of attenuating acoustic waves can include a plurality of acoustic paths, each of which may have different acoustic impedance and/or length. The acoustic paths may help the acoustic waves have out-of-sync phases after the acoustic waves passing through the acoustic paths, resulting in acoustic wave attenuation.