Muffler Shield Profile Design for Aerodynamic Turbulence Reduction
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Solution Overview
Problem
Mufflers positioned under vehicles experience aerodynamic resistance and turbulence due to their location, leading to noise and vibration issues, which existing solutions fail to adequately address.
Innovation Solution
A muffler shield with a unique longitudinal design featuring a middle portion and side portions with distinct profiles, made of resilient materials, that reduces aerodynamic turbulence by minimizing mechanical connectors and using adhesives and heat-assisted soldering for attachment, along with end covers and a cavity to reduce weight and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a muffler is positioned underneath the vehicle body, then structural and mechanical considerations are satisfied, but aerodynamic resistance and turbulence increase leading to noise and vibration
Solution Approach 1:
A shield body is introduced as an intermediary component between the airflow and the muffler. The shield extends along the longitudinal direction and includes a middle portion and side portions that create a protective barrier, redirecting airflow around the muffler assembly and reducing direct aerodynamic resistance and turbulence on the muffler.
Solution Approach 2:
The shield design incorporates varying profiles in different dimensions - the middle portion has a first profile while the side portions have a second profile that is shorter than the first profile. This dimensional variation creates optimized airflow pathways that reduce turbulence while maintaining structural effectiveness.
2Strength
If mechanical connectors are used to attach the shield to the muffler, then structural support is provided, but noise and vibration are increased
Solution Approach 1:
The patent replaces mechanical connectors (fasteners, bolts, rivets) with an adhesive bonding system. The adhesive layer attaches the shield body to the muffler assembly, providing structural support while eliminating the noise and vibration generated by mechanical fastening components. This substitution maintains the structural integrity of the assembly without the harmful effects of mechanical connections.
3Ease of manufacture
If the shield profile is uniform along the longitudinal direction, then manufacturing is simplified, but aerodynamic performance is reduced
Solution Approach 1:
The shield body is designed with non-uniform profiles - the middle portion has a first profile while the side portions have a second profile that is shorter than the first profile. This local quality variation optimizes aerodynamic performance by creating specific airflow patterns that reduce turbulence in different regions, while still maintaining reasonable manufacturing complexity.
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 design enhances aerodynamic performance by reducing airflow turbulence, minimizing noise and vibration, and providing structural support without the need for additional fasteners, thus improving the muffler's operational efficiency and reducing unwanted debris entry.
Implementation Method 1
a plurality of adhesive materials positioned between the shield body and the muffler assembly
Implementation Method 2
heat-assisted soldering for attachment
Data Source
AI summary
In one or more embodiments, a muffler shield includes a shield body extending in a longitudinal direction and defining a middle portion positioned between first and second side portions along a transverse direction, a cross-section of the middle portion and at least one of the first and second side portions respectively defining a middle profile and a side profile shorter than the middle profile.