Muffler Housing Prestressing for Vibration Control
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Solution Overview
Problem
Muffler housings in vehicle exhaust systems tend to experience natural vibrations, leading to undesired noise emissions, particularly in areas with reduced wall thickness, which are often used to save weight and reduce energy consumption.
Innovation Solution
Incorporating a prestressing device within the muffler housing that applies outwardly oriented supporting forces to specific areas of the jacket, altering its natural vibration behavior and reducing the tendency for unwanted vibrations without increasing noise emissions, even with thinner sheet metal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the wall thickness of the sheet metal is reduced to save weight, then the energy consumption of the vehicle is reduced, but the tendency for natural vibrations in the jacket increases
Solution Approach 1:
The prestressing device applies preliminary outwardly oriented supporting forces to the jacket in specific support areas before vibrations occur. This pre-stressing counteracts the inward forces during operation, preventing the jacket from vibrating even when wall thickness is reduced for weight savings.
Solution Approach 2:
Instead of uniformly thickening the entire jacket, the prestressing device applies targeted supporting forces to specific critical areas of the jacket where vibrations are most likely to occur. This localized approach maintains weight efficiency while providing vibration stability where needed.
2Weight of moving object
If the wall thickness of the sheet metal is reduced to save weight, then the energy consumption of the vehicle is reduced, but noise emissions increase due to natural vibrations
Solution Approach 1:
The prestressing device applies preliminary outwardly oriented supporting forces to the jacket in specific support areas before vibrations occur. This pre-stressing counteracts the inward forces during operation, preventing the jacket from vibrating even when wall thickness is reduced for weight savings.
Solution Approach 2:
Instead of uniformly thickening the entire jacket, the prestressing device applies targeted supporting forces to specific critical areas of the jacket where vibrations are most likely to occur. This localized approach maintains weight efficiency while providing vibration stability where needed.
3Stability of the object's composition
If prestressing forces are applied to reduce natural vibrations, then vibration stability is improved, but device complexity increases
Solution Approach 1:
The prestressing device utilizes the flexible nature of the thin-walled jacket by applying distributed outward forces that the flexible shell can effectively resist. The flexibility of the thin-walled structure allows it to conform to the prestressing forces without requiring additional rigid support elements.
Solution Approach 2:
The prestressing device acts as an intermediary element that mediates between the internal pressure forces and the jacket structure. By introducing this intermediate prestressing mechanism, the system achieves vibration stability without directly modifying the jacket design or requiring complex active control systems.
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 prestressing device effectively stabilizes the muffler housing, reducing natural vibrations and allowing for thinner wall thicknesses without compromising noise reduction, thus enhancing weight savings and energy efficiency.
Implementation Method 1
at least one prestressing device (14) which is arranged in the interior (7) of the housing (1) and which introduces an outwardly oriented prestress (16, 18) into the casing (2) in at least one support area (15, 17) of the casing (2)
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The present invention relates to a housing (1) with a shell (2) that encloses a housing interior (7) in the circumferential direction (8). To reduce natural vibrations of the shell (2), at least one preloading device (14) is proposed, which is arranged in the housing interior (7) and which is supported on a first support area (15) of the shell (2) on the inside under an outwardly oriented first preload (16) and which is supported on a second support area (17) of the shell (2) spaced apart from the first support area (15) on the inside of the shell (2) under an outwardly oriented second preload (18).