Resonance Generating Muffler for Low Back-Pressure Sound Control
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Solution Overview
Problem
Existing mufflers face challenges in achieving low back-pressure while maintaining pleasing sound, often resulting in undesirable noises like 'drone' and 'popping', and fail to enhance the sound of engines effectively.
Innovation Solution
A muffler design featuring elongated members that resonate with exhaust gases to produce noise-canceling and sound-enhancing tones, combined with sound baffles and absorbent materials to minimize back-pressure and improve sound quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If physically altering the path of exhaust gasses (passive-reactive type) or using sound absorbent material (absorptive type) is used to attenuate sound, then sound attenuation is improved, but back pressure increases
Solution Approach 1:
The patent employs resonating chambers that utilize mechanical vibration of air columns at specific frequencies to cancel unwanted exhaust sounds. The resonating chambers are tuned to specific frequencies to produce destructive interference with drone and popping noises, achieving sound attenuation without the need for traditional absorbent materials that create back pressure.
Solution Approach 2:
The patent utilizes phase transition of sound waves through resonance, where the resonating chambers transform the phase of exhaust sound waves to create destructive interference. This allows sound cancellation through wave interference rather than absorption, maintaining low back pressure while achieving effective sound attenuation.
2Object-affected harmful factors
If active-reactive mufflers with electronic noise canceling are used to reduce sound, then sound cancellation is improved, but device complexity and expense increase
Solution Approach 1:
The patent replaces complex electronic active noise cancellation systems with a purely passive acoustic resonance-based system. The resonating chambers and exhaust path geometry are designed to naturally produce noise-canceling sound waves through acoustic resonance and interference, eliminating the need for electronic sensors, speakers, and control systems.
Solution Approach 2:
The exhaust system itself serves as the noise cancellation mechanism through its geometric design. The resonating chambers and path configurations automatically generate noise-canceling waves based on the exhaust flow characteristics, requiring no external power source or electronic control systems.
3Object-affected harmful factors
If traditional mufflers are used to attenuate sound, then sound reduction is improved, but desirable exhaust flow and engine performance are reduced
Solution Approach 1:
The resonating chambers utilize the kinetic energy of the exhaust flow itself to generate resonant vibrations that cancel unwanted sounds. This approach converts exhaust flow energy into useful sound cancellation rather than dissipating it through absorption materials, maintaining high exhaust flow velocity and reducing back pressure.
Solution Approach 2:
The patent changes the acoustic parameters of the exhaust system by introducing resonating chambers with specific dimensions and configurations. These parameters are optimized to target specific frequency ranges (drone and popping) while maintaining open exhaust pathways that preserve high flow velocity and minimize back pressure.
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 achieves extremely low back-pressure, reduces undesirable noises, and provides a crisp, natural engine sound, addressing issues like 'drone' and 'popping', and enhancing the overall sound experience.
Implementation Method 1
A plurality of elongated members produce resonance when subjected to flowing exhaust gasses, which results in noise canceling and/or sound enhancing tones
Data Source
AI summary
In accordance with at least one embodiment: a muffler with a case (comprised of at least one inlet, at least one outlet, and a body), and elongated members comprised of material capable of a predetermined resonance. The elongated members have sufficient length after their final point of attachment to vibrate when exposed to flowing exhaust gasses. This vibration results in resonance that is noise canceling and/or sound enhancing. The muffler may also contain any combination of sound baffles, sound absorbent material, and other sound altering devices.