Viscoelastic Polyamide Resin Composition for Motor Vibration Damping

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Solution Overview

Problem

Existing materials used in electric mobility vehicles, such as aluminum and plastic, are ineffective in absorbing and suppressing high-frequency noise vibrations generated by electric motors, leading to noise issues.

Innovation Solution

A viscoelastic resin composition comprising aliphatic and aromatic polyamide-based resins, with a specific weight ratio, along with fibrous reinforcing materials and additives, to enhance damping performance against vibrations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If aluminum or plastic materials are used for motor housing, then mechanical strength and heat resistance are improved, but vibration damping performance deteriorates

Engineering Contradiction:

Improvemechanical strengthVSAvoidvibration damping performance

Core Design Contradiction:

StrengthVSObject-affected harmful factors

Solution Approach 1:

The patent applies composite materials by combining aliphatic polyamide resin and aromatic polyamide resin in a specific weight ratio (1:4 to 1:0.25) to create a material that exhibits both mechanical strength and superior vibration damping performance. The aromatic polyamide component provides rigidity and heat resistance while the aliphatic polyamide component contributes to damping characteristics, achieving a balance that neither material could provide alone.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent changes the chemical composition parameters of the resin material by specifying precise weight ratios of aliphatic to aromatic polyamide resins. This parameter optimization allows the material to achieve both high mechanical strength and excellent vibration damping properties, resolving the contradiction between strength and damping performance.

Inventive Principle:

Principle #35Parameter changes

2Ease of manufacture

If conventional materials are used, then manufacturing cost is reduced, but noise suppression capability deteriorates

Engineering Contradiction:

Improvemanufacturing costVSAvoidnoise suppression capability

Core Design Contradiction:

Ease of manufactureVSObject-affected harmful factors

Solution Approach 1:

The patent uses composite resin materials combining aliphatic and aromatic polyamides to achieve high noise suppression capability. The specific formulation maintains manufacturability through established polymer processing techniques while delivering superior acoustic performance that conventional single-material systems cannot achieve.

Inventive Principle:

Principle #40Composite materials

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 composition effectively attenuates high-frequency noise vibrations, maintaining mechanical strength and heat resistance, as demonstrated by loss tangent values within specified ranges.

Implementation Method 1

viscoelastic resin composition

Methodology Applied

Scientific EffectViscoelasticity: Viscoelasticity

Implementation Method 2

damping performance against vibrations

Methodology Applied

Scientific EffectDamping: Damping

Data Source

PatentUS20250215224A1Viscoelastic resin composition and molded article thereof

Publication Date: 2025.07.03 HYUNDAI MOTOR CO LTD

AI summary

Disclosed is a viscoelastic resin composition including: an aliphatic polyamide-based resin including a repeating unit represented by a following Chemical Formula 1; and an aromatic polyamide-based resin, wherein a weight ratio of the aliphatic polyamide-based resin and the aromatic polyamide-based resin is in a range of 1:4 to 1:0.25:where in the Chemical Formula 1, X is a natural number from 4 to 8.