Compact Helmholtz Silencer for Turbocharged Engine Noise
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Solution Overview
Problem
Conventional silencers for turbocharged engines are inefficient in suppressing broadband noise due to their narrow frequency range and high cost, and are constrained by mounting space, leading to suboptimal performance and complexity.
Innovation Solution
A silencer design featuring a central perforated tube with an additional perforated structure forming multiple chambers radially communicating with each other, which includes an additional perforated tube mounted concentrically, creating a compact Helmholtz resonance chamber structure for improved noise attenuation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional silencer is used, then the structure is simple, but the silencing frequency range is narrow and broadband noise suppression is poor
Solution Approach 1:
The silencer is divided into multiple functional chambers: a first chamber with a first perforated tube, a second chamber with a second perforated tube, and a third chamber, with each chamber contributing to different aspects of noise suppression across different frequency ranges
Solution Approach 2:
The first perforated tube is nested within the second perforated tube, which is in turn nested within the outer housing, creating a multi-layered concentric structure that maximizes silencing effectiveness within limited space
2Reliability
If the outer diameter of the annular resonance chamber is increased to improve silencing effect, then the silencing performance improves, but the mounting space requirement increases
Solution Approach 1:
The invention transitions from a single-chamber radial design to a multi-chamber axial arrangement, utilizing the axial dimension to stack multiple silencing chambers vertically, thereby achieving enhanced silencing performance without increasing the radial mounting footprint
Solution Approach 2:
Concentric nesting of multiple perforated tubes within each other creates multiple annular chambers in a compact radial arrangement, maximizing the use of available space while maintaining effective silencing chamber volumes
3Reliability
If a perforated silencer with multiple chambers is designed to achieve broadband silencing, then the silencing effect improves, but the manufacturing cost increases
Solution Approach 1:
The silencer is segmented into multiple chambers that can be manufactured as separate components and then assembled together, allowing for simpler individual part manufacturing while achieving complex overall functionality
Solution Approach 2:
The outer housing serves multiple functions: it contains the third chamber for noise suppression, provides the outer boundary for the concentric tube structure, and acts as the mounting interface, thereby reducing the need for separate components
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 achieves a more effective broadband silencing effect across a broader frequency range, is compact, and reduces manufacturing costs while accommodating limited mounting space, enhancing rider comfort and engine performance.
Implementation Method 1
Perforated broadband silencers are widely applied in air inlet systems of turbocharged engines as excellent silencing elements meeting requirements of both silencing and mounting space, and each include a main tube and several annular resonance chambers
Implementation Method 2
A desirable broadband silencing effect can be achieved by adjusting the width, diameter and number of the annular resonance chambers and the aperture and number of perforates
Data Source
AI summary
A silencer having an outer housing; and a central perforated tube through which air flows. The silencer further includes an additional perforated structure located between the central perforated tube and the outer housing, a first chamber is formed between the central perforated tube and the additional perforated structure, and the additional perforated structure is configured such that at least one second chamber is formed, which is at least partially located radially outside of the first chamber, where the second chamber is communicated with the first chamber by perforates. The disclosure further relates to a vehicle engine having the silencer. The silencer is compact in structure, and has a better broadband silencing effect.