Acoustical Baffles for HDD Vibration Attenuation

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Solution Overview

Problem

Internal components of hard disk drives in information handling systems are susceptible to acoustically-induced vibrations, leading to performance loss and potential failure, exacerbated by cooling methods that generate unwanted vibrations.

Innovation Solution

A computing chassis with acoustical baffles made of acoustic absorbing material positioned perpendicular to the airflow generated by a fan module, which attenuates acoustic waves and minimizes their impact on hard disk drives while maintaining airflow efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

If extreme air movers are used to maintain cooling, then cooling efficiency is improved, but acoustically-induced vibrations increase causing performance loss and potential HDD failure

Engineering Contradiction:

Improvecooling efficiencyVSAvoidacoustically-induced vibrations

Core Design Contradiction:

TemperatureVSObject-affected harmful factors

Solution Approach 1:

Acoustical baffles are introduced as intermediary elements between the fan module and hard disk drives. These baffles absorb acoustic waves generated by the fan, preventing them from reaching the HDDs and causing vibrations, while allowing the cooling airflow to pass through effectively

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

Acoustic absorbing material is strategically positioned in specific locations where acoustic waves propagate towards the hard disk drives. The baffles are placed at distances optimized to intercept acoustic waves while maintaining airflow paths, creating localized acoustic absorption zones without compromising overall cooling efficiency

Inventive Principle:

Principle #3Local quality

2Object-affected harmful factors

If acoustical baffles are positioned close to the fan module, then acoustic wave attenuation is improved, but impedance to airflow increases

Engineering Contradiction:

Improveacoustic wave attenuationVSAvoidairflow impedance

Core Design Contradiction:

Object-affected harmful factorsVSLoss of energy

Solution Approach 1:

Instead of positioning baffles directly in the airflow path (one-dimensional approach), the baffles are positioned perpendicular to the airflow direction. This allows acoustic wave absorption in the acoustic propagation direction while maintaining unobstructed airflow paths, effectively resolving the conflict between acoustic attenuation and airflow impedance

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Loss of energy

If acoustical baffles are positioned far from the fan module, then airflow impedance is reduced, but acoustic wave attenuation effectiveness decreases

Engineering Contradiction:

Improveairflow impedanceVSAvoidacoustic wave attenuation

Core Design Contradiction:

Loss of energyVSObject-affected harmful factors

Solution Approach 1:

Multiple acoustical baffles are positioned at different distances from the fan module, creating a segmented approach. The first baffle is positioned closer to provide initial acoustic attenuation, while the second baffle is positioned farther away to provide additional attenuation without excessive airflow impedance. This segmented positioning optimizes the balance between acoustic wave attenuation and airflow impedance

Inventive Principle:

Principle #1Segmentation

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 solution effectively reduces the acoustical profile and minimizes impedance to airflow, thereby protecting hard disk drives from vibration-induced damage while maintaining cooling efficiency.

Implementation Method 1

a first baffle having acoustic absorbing material... a second baffle having acoustic absorbing material... wherein the first and the second baffle extend between the first and second sides of the chassis perpendicular to the airflow, and the acoustic absorbing material of the first and the second baffle attenuate acoustic waves generated by the fan module

Methodology Applied

Scientific EffectAcoustic absorption: Acoustic Absorption

Data Source

PatentUS12108560B2Computing chassis including acoustical baffles

Publication Date: 2024.10.01 DELL PROD LP

AI summary

A computing chassis, including hard disk drives positioned at a first end of the chassis; a fan module positioned at a second end of the chassis; a first baffle having acoustic absorbing material, the first baffle extending between a first and a second side of the chassis, wherein the first and second sides of the chassis extend between the first and the second ends of the chassis, the first baffle spaced-apart from the fan module a first distance; a second baffle having acoustic absorbing material, the second baffle extending between the first and the second side of the chassis, the second baffle spaced-apart from the fan module a second distance greater than the first distance, wherein the first and the second baffle extend between the first and second sides of the chassis perpendicular to an airflow, and the acoustic absorbing material of the baffles attenuate acoustic waves.