Vehicle Exhaust Patch With Pores And Wire Mesh For Noise Damping
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing vehicle exhaust systems face challenges in effectively damping noise while maintaining durability, as current methods like Standing Wave Management (SWM) require large holes that compromise structural integrity and are prone to debris plugging, and conventional manufacturing struggles with producing small diameter holes in thicker materials.
Innovation Solution
A vehicle exhaust system with a tubular component featuring a patch that covers openings with a first portion having a plurality of pores and a second portion providing structural rigidity, along with wire mesh inserts that couple with the patch to cover pores, enhancing sound damping and durability by allowing controlled exhaust gas flow and reducing debris accumulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If microperforated material is used to dampen noise in SWM, then sound attenuation is improved, but structural durability is worsened
Solution Approach 1:
The patent uses a composite structure combining microperforated material with a supporting framework or substrate. This composite approach allows the thin microperforated material to provide acoustic damping while the supporting structure maintains structural integrity, resolving the contradiction between noise attenuation and durability
Solution Approach 2:
The microperforated material is applied selectively in specific locations where acoustic damping is needed, rather than throughout the entire exhaust system. This localized application maintains structural durability in critical areas while providing noise attenuation where required
2Object-generated harmful factors
If larger holes are created in microperforated material for sound exit, then sound attenuation is improved, but durability is worsened
Solution Approach 1:
The patent employs porous materials with controlled pore sizes and distributions that allow sound waves to pass through effectively while maintaining structural strength. The porous structure provides acoustic damping functionality without requiring large holes that would compromise durability
3Ease of manufacture
If conventional manufacturing methods are used to produce small diameter holes, then manufacturing simplicity is maintained, but manufacturing precision is worsened
Solution Approach 1:
The patent changes the manufacturing parameters by using advanced techniques such as laser drilling, electro-discharge machining, or precision stamping that can produce consistent small diameter holes (less than 1mm) with high precision. These methods maintain ease of manufacture through automation while achieving the required hole diameter precision
4Loss of substance
If exhaust gas flows across microperforated material surface, then exhaust gas leakage is reduced, but acoustic properties are worsened
Solution Approach 1:
The patent introduces an intermediary structure such as a baffle, screen, or flow guide between the exhaust gas flow and the microperforated material. This intermediary directs the exhaust gas flow to minimize grazing across the microperforated surface, thereby preserving the acoustic damping effectiveness while still allowing controlled exhaust gas leakage
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 effectively dampens sound waves while maintaining structural integrity and preventing debris accumulation, allowing for efficient noise reduction without compromising the exhaust system's durability, even with thicker materials, and can be easily integrated into existing systems.
Implementation Method 1
The first portion defines a plurality of pores. The first portion covers the at least one opening... effectively dampens sound waves while maintaining structural integrity
Implementation Method 2
The SWM includes an opening provided on an exhaust pipe. The opening provides a secondary exhaust leak path for sound to exit the exhaust pipe and minimizes leakage of the exhaust gas through the opening
Data Source
AI summary
A vehicle exhaust system includes a tubular component having an inner surface and an outer surface. The vehicle exhaust system also includes at least one opening defined by the tubular component. The at least one opening extends through each of the inner surface and the outer surface. The vehicle exhaust system further includes a patch adapted to cover the at least one opening. The patch includes a first portion extending parallel to the central axis. The first portion defines a plurality of pores. The first portion covers the at least one opening. The patch also includes a second portion extending away from the first portion. The first portion has a first thickness and the second portion has a second thickness.