Composite Sound-Absorbing Material for Broad-Band Noise Reduction
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Solution Overview
Problem
Conventional sound-absorbing materials for electric vehicles fail to provide effective noise reduction across the entire sound range, are heavy, and increase production costs due to their bulkiness, affecting fuel efficiency.
Innovation Solution
A composite sound-absorbing material composed of a base layer with specific fiber diameters and thicknesses, combined with a fiber sheet, satisfying the condition (a+b)^2 ranging from 13.3 to 583, where 'a' is the average diameter of the first fiber and 'b' is the thickness of the fiber sheet, along with a binder layer for fixation, to enhance heat blocking and sound absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional porous materials such as PET nonwoven fabric, ultra-fine fabric, and urethane foam are thickly applied for insulation, then sound absorption and heat blocking effects are improved, but weight and volume increase significantly
Solution Approach 1:
The patent applies composite materials by combining a base layer with specific fiber diameter requirements and a fiber sheet layer. This composite structure achieves effective sound absorption and heat blocking across the entire sound range while significantly reducing weight and volume compared to conventional single-material thick applications
Solution Approach 2:
The patent changes the fiber diameter parameter of the base layer to satisfy specific conditions (a+b)^2 within certain ranges, where a is the average diameter of the first fiber and b is the thickness of the fiber sheet. This parameter optimization enables achieving sound absorption effects with reduced material thickness and weight
2Reliability
If conventional porous materials are thickly applied for insulation, then sound absorption and heat blocking effects are improved, but volume increases causing decreased fuel efficiency
Solution Approach 1:
The composite structure of base layer plus fiber sheet achieves effective heat blocking and sound absorption with reduced volume, directly addressing the contradiction between thermal insulation performance and vehicle interior volume
Solution Approach 2:
By optimizing the fiber diameter and thickness parameters to satisfy the condition (a+b)^2 within specific ranges, the patent achieves high heat blocking and sound absorption performance with minimized material volume, improving fuel efficiency
3Reliability
If conventional sound absorbing materials are used, then sound absorption in specific frequency ranges is achieved, but noise reduction across the entire sound range is impossible
Solution Approach 1:
The patent segments the sound absorption function into two components: the base layer with specific fiber diameter handles certain frequency characteristics, while the fiber sheet layer handles other frequency ranges. This segmentation enables comprehensive noise reduction across the entire sound range from low to high frequencies
Solution Approach 2:
The composite structure combines materials with different acoustic properties to achieve broad-frequency sound absorption. The base layer and fiber sheet work synergistically to provide effective noise reduction across all frequency ranges, including low-pitched regions (300 Hz or less), medium-pitched regions (300 Hz to 2,000 Hz), and high-pitched regions (2,000 Hz or more)
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 composite material achieves excellent heat blocking and sound absorption across the entire sound range while reducing volume and weight, improving fuel efficiency and lowering production costs.
Implementation Method 1
Basic sound-absorbing materials take in sound wave energy, convert it into other kinetic energy such as vibration, convert it into heat energy, and absorb it into the atmosphere or sound-absorbing material itself to attenuate sound
Implementation Method 2
it is necessary to develop a sound-absorbing material that exhibits excellent heat blocking effects and excellent sound-absorbing effects in the entire sound range
Data Source
AI summary
Provided is a composite sound-absorbing material. The composite sound-absorbing material includes: a base layer comprising at least one first fiber; and a fiber sheet comprising at least one second fiber and arranged on at least one surface of the base layer, wherein the base layer and the fiber sheet are implemented to satisfy predetermined conditions. Accordingly, excellent heat blocking and excellent sound absorption across the entire sound range can simultaneously be realized. In addition, along with the heat blocking and sound absorption, excellent reduction in volume and weight also can simultaneously be realized.