Internal Sound Reduction Device for Channel Noise Control

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Solution Overview

Problem

Current sound reduction methods are inadequate for high-performance engines and industrial systems due to space and cost constraints, as standard sound-absorbing materials are ineffective in reducing high-frequency noise emissions, especially in channels where external installation is not feasible.

Innovation Solution

A sound reduction system comprising a sound reduction device with a supporting structure and frame, where sound-reducing material is placed inside the channel, allowing for adjustable placement and easy maintenance, using either solid members or fibre mats to target specific frequency ranges, and featuring a collar for secure mounting and fastening arrangements to prevent material displacement.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If sound reducing material is placed outside the channel, then sound absorption is improved, but space availability deteriorates due to space constraints

Engineering Contradiction:

Improvesound absorptionVSAvoidspace availability

Core Design Contradiction:

Object-affected harmful factorsVSArea of stationary object

Solution Approach 1:

The sound reducing material is nested inside the existing channel structure, with the frame and supporting structure fitting within the channel's internal space. This eliminates the need for external installation while maintaining sound absorption functionality.

Inventive Principle:

Principle #7Nested doll (Nesting)

Solution Approach 2:

The invention transitions from external to internal placement by utilizing the channel's internal cross-sectional area, effectively using a different spatial dimension (inside vs. outside) to resolve the space constraint problem.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Area of stationary object

If sound reducing material is placed inside the channel, then space utilization is improved, but pressure drop increases

Engineering Contradiction:

Improvespace utilizationVSAvoidpressure drop

Core Design Contradiction:

Area of stationary objectVSLoss of energy

Solution Approach 1:

The frame and supporting structure are designed with specific local geometries (openings, collar configurations) that minimize flow resistance in critical areas while maintaining sound absorption in other areas, balancing space utilization with pressure drop reduction.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The supporting structure includes openings that allow gaseous medium passage, creating a porous-like flow path that reduces pressure drop while maintaining the structural framework for sound reducing material placement.

Inventive Principle:

Principle #31Porous materials

3Stability of the object's composition

If sound reducing material is fixed permanently, then structural stability is improved, but maintenance difficulty increases

Engineering Contradiction:

Improvestructural stabilityVSAvoidmaintenance difficulty

Core Design Contradiction:

Stability of the object's compositionVSEase of repair

Solution Approach 1:

The sound reduction system is segmented into removable components (frame, supporting structure, sound reducing material) that can be independently accessed and replaced, enabling easy maintenance while maintaining structural stability during operation.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The mounting arrangement transitions from permanent fixation to dynamic removability, allowing the sound reducing material to be securely held during operation but easily removed for maintenance by detaching the frame from the channel.

Inventive Principle:

Principle #15Dynamics

4Object-affected harmful factors

If sound reducing material is customized for specific frequencies, then sound reduction effectiveness is improved, but device complexity increases

Engineering Contradiction:

Improvesound reduction effectivenessVSAvoiddevice complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The frame and supporting structure are designed as universal components that can accommodate different types and configurations of sound reducing materials, allowing the same basic structure to be adapted for various frequency ranges without redesigning the entire device.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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

Effectively reduces sound pressure across various frequency ranges within channels, maintaining structural integrity and reducing pressure drop, while allowing for easy replacement and adaptation of sound-reducing materials to suit different applications and frequency spectra.

Implementation Method 1

a sound reducing material (4) placed in the frame (3)

Methodology Applied

Scientific EffectSound absorption: Acoustic Absorption

Data Source

PatentEP2871636B1Sound reduction system

Publication Date: 2021.01.06 VOLVO CAR CORP

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AI summary

The invention relates to a sound reduction system (12) comprising a sound reduction device (1). The sound reduction device (1) comprises a sound reducing material (4). The system further comprises a channel (13) wherein a gaseous medium is arranged to flow. The sound reduction device (1) is mounted inside the channel (13), thereby placing the sound reducing material (4) inside the channel (13).