Acoustic Insulation Density Measurement

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Solution Overview

Problem

Existing methods for determining the density of insulation, such as the Cubic Foot Density Test and Densi-Checker, are destructive, time-consuming, and not representative of the actual installed product, lacking practicality for multiple location testing and requiring significant repair time.

Innovation Solution

A device and method utilizing a sound generator and sound sensors to detect sound transmission through insulation, allowing for non-destructive, efficient determination of insulation density without assuming uniform density, enabling measurements over areas or volumes with minimal repair time.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If destructive testing methods (Cubic Foot Density Test, Densi-Checker) are used to measure insulation density, then measurement precision can be achieved, but the testing process becomes time-consuming and requires repairs at test locations

Engineering Contradiction:

Improveinsulation density measurementVSAvoidtesting time and repair time

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The patent replaces mechanical/destructive testing methods with an acoustic field-based measurement system. A sound source emits acoustic waves through the insulation material, and sensors detect the transmitted sound characteristics. The system uses acoustic transmission loss measurements to determine insulation density without physical damage or time-consuming procedures.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent introduces sound waves as an intermediary medium to indirectly measure insulation density. Instead of directly measuring physical properties that require destruction, the system uses acoustic waves as a mediator that interacts with the insulation material, allowing non-destructive characterization of density through sound transmission properties.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If multiple locations are tested using existing methods, then comprehensive insulation assessment is achieved, but the number of repairs required increases significantly

Engineering Contradiction:

Improveinsulation assessment reliabilityVSAvoidrepair requirements at test locations

Core Design Contradiction:

ReliabilityVSEase of repair

Solution Approach 1:

The acoustic measurement system eliminates the need for physical openings or damage at multiple test locations. By using sound waves that can traverse the insulation material, the system provides comprehensive multi-location assessment without creating repairable damage, thus improving ease of repair while maintaining assessment reliability.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Device complexity

If uniform density assumption is made for blown-in insulation to simplify measurement, then measurement process becomes simpler, but measurement precision deteriorates due to actual density variations

Engineering Contradiction:

Improvemeasurement process complexityVSAvoidinsulation density accuracy

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The system performs measurements at multiple discrete locations within the insulation cavity, capturing local density variations. By taking multiple partial measurements across different positions and combining them, the system achieves comprehensive characterization of non-uniform density distribution without requiring overly complex single-point measurement equipment.

Inventive Principle:

Principle #16Partial or excessive action

Solution Approach 2:

The system uses feedback from acoustic transmission measurements at multiple locations to build a comprehensive understanding of insulation density distribution. The measured data from various positions provides feedback that reveals actual density variations, allowing the system to accurately characterize non-uniform insulation without assuming uniformity.

Inventive Principle:

Principle #23Feedback

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

Enables accurate, non-destructive measurement of insulation density across multiple locations with reduced time and repair requirements, providing comprehensive data on insulation density without the limitations of existing methods.

Implementation Method 1

one or more sound sensors configured to detect sound that is generated by the sound generator and transmitted through the insulation to the one or more sound sensors

Methodology Applied

Scientific EffectSound transmission: Sound

Data Source

PatentUS11162884B2Devices and methods for determining the density of insulation

Publication Date: 2021.11.02 CERTAINTEED LLC

AI summary

The present disclosure relates to devices and methods for determining the density of insulation. For example, one aspect of the disclosure is a device that includes a sound generator and one or more sound sensors configured to detect sound that is generated by the sound generator and transmitted through the insulation to the one or more sound sensors. The device also includes a control system configured to cause the sound generator to generate the sound and use the sound detected by the one or more sound sensors to generate output that represents the density of the insulation. Another aspect of the disclosure is a method for using the device to determine the density of insulation.