Perforated Vehicle Acoustic Module for Multi-Band Noise Control

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Solution Overview

Problem

Conventional sound absorption and insulation systems for vehicles are inefficient in responding to noises in various frequency bands, leading to increased assembling costs, weight, and cost due to the addition of sound absorption materials and increased thickness of insulation materials.

Innovation Solution

A sound absorption and insulation module for vehicles featuring a perforated panel with varying hole diameters, numbers, and distances, combined with porous sound absorption and sound insulation materials, allowing for tailored sound absorption and insulation performance across different frequency bands.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If additional sound absorption material is added or thickness of sound absorption and insulation material is increased to respond to noise frequency components, then sound absorption and insulation performance is improved, but assembling cost and weight increase

Engineering Contradiction:

Improvesound absorption and insulation performanceVSAvoidweight of sound absorption and insulation system

Core Design Contradiction:

ReliabilityVSWeight of moving object

Solution Approach 1:

The patent applies local quality by creating a perforated panel with non-uniform hole distribution where different regions have different hole diameters, numbers, and spacing patterns tailored to address specific noise frequency components from different vehicle components (engine, transmission, motor, inverter, road noise, wind noise). This allows targeted sound absorption at specific frequencies without uniformly increasing material thickness throughout the entire system, thereby reducing overall weight while maintaining effective noise control performance.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent utilizes parameter changes by varying the physical parameters of the perforated panel (hole diameter, hole number, hole spacing, porosity ranging from 0.5 to 3%) to optimize sound absorption characteristics for different frequency bands. By adjusting these parameters, the system achieves effective noise control across multiple frequency components without requiring increased material thickness, thus preventing weight increase while improving sound absorption performance.

Inventive Principle:

Principle #35Parameter changes

2Reliability

Engineering Contradiction:

Improvesound absorption and insulation performanceVSAvoidassembling cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent merges multiple sound absorption and insulation materials into a single integrated module structure consisting of a perforated panel with optimized hole patterns, sound absorption material, and sound insulation material laminated together. This integration eliminates the need for separate assembly steps for multiple components, reduces assembling cost, and simplifies installation while maintaining effective noise control performance across various frequency bands.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent optimizes the porosity parameter of the perforated panel within a specific range (0.5 to 3%) to achieve effective sound absorption without requiring excessive material thickness. This parameter optimization reduces material costs and simplifies manufacturing processes, thereby lowering assembling cost while maintaining or improving sound absorption and insulation performance.

Inventive Principle:

Principle #35Parameter changes

3Ease of manufacture

If uniform hole distribution is used in perforated panel, then manufacturing is simplified, but sound absorption performance across different frequency bands is insufficient

Engineering Contradiction:

Improvemanufacturing simplicityVSAvoidsound absorption performance

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent implements local quality through a non-uniform hole distribution pattern in the perforated panel, where different regions have specifically designed hole diameters, numbers, and spacing arrangements. Each region's hole pattern is optimized to address noise from specific vehicle components (engine, transmission, motor, inverter, road noise, wind noise), enabling effective sound absorption across multiple frequency bands while maintaining manufacturability through systematic design approaches.

Inventive Principle:

Principle #3Local quality

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 module effectively responds to noises in various frequency bands, reducing the weight and cost of the sound absorption and insulation system while maintaining optimal sound absorption and insulation performance.

Implementation Method 1

a sound absorption material that is porous and disposed on the perforated panel

Methodology Applied

Scientific EffectSound absorption: Acoustic Absorption

Implementation Method 2

a sound insulation material disposed on the sound absorption material

Methodology Applied

Scientific EffectSound insulation: Sound

Data Source

PatentUS20250074336A1Sound absorption and insulation module for vehicle

Publication Date: 2025.03.06 HYUNDAI MOTOR CO LTD

AI summary

A sound absorption and insulation module for a vehicle includes a perforated panel that defines a plurality of holes, a sound absorption material, and a sound insulation material. The perforated panel, the sound absorption material, and the sound insulation material are sequentially coupled. A diameter of the holes, a number of the holes, and a distance between the holes are determined based on noise frequency bands, thereby effectively responding to noises in various frequency bands generated from one or more portions of a specific component of the vehicle.