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Correlation Between Sound Insulation and Occupants' Perception - Proposal of Alternative Single Number Rating of Impact Sound, Part II

https://research.thinkwood.com/en/permalink/catalogue2134
Year of Publication
2017
Topic
Acoustics and Vibration
Material
CLT (Cross-Laminated Timber)
Application
Floors
Author
Ljunggren, Fredrik
Simmons, Christian
Öqvist, Rikard
Publisher
Elsevier
Year of Publication
2017
Format
Journal Article
Material
CLT (Cross-Laminated Timber)
Application
Floors
Topic
Acoustics and Vibration
Keywords
Impact Sound Insulation
Low Frequency
Lightweight
Footstep Annoyance
Subjective Perception
Single Number Quantity
Research Status
Complete
Series
Applied Acoustics
Summary
A previous Swedish research project indicated the potential need for evaluating impact sound insulation from 20 Hz in buildings with lightweight constructions. This is a discrepancy compared to the commonly used frequency intervals starting from 50 or 100 Hz. The statistical significance of this groundbreaking suggestion was however not satisfactorily strong since the result was based upon a limited number of building objects. The scope of the present paper is to secure the previous study by adding additional objects to the underlying database, thereby increasing the confidence of the results. The methodology is to perform impact sound insulation measurements in apartment buildings of various construction types and to perform questionnaire surveys among the residents. The measured sound insulation is compared to the subjective rating by the occupants in order to find the parameter giving the highest correlation with respect to frequency range and weighting. The highest correlation was found when the impact sound insulation was evaluated from 25 Hz using a flat frequency-weighting factor. Frequencies below 50 Hz are of great importance when evaluating impact sound insulation in lightweight constructions.
Online Access
Free
Resource Link
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Improving Impact Sound Insulation Performance of Mass Timber Floors with Dry Floating Floor Solution

https://research.thinkwood.com/en/permalink/catalogue2817
Topic
Acoustics and Vibration
Material
CLT (Cross-Laminated Timber)
DLT (Dowel Laminated Timber)
Other Materials
Application
Floors
Organization
University of Northern British Columbia
Material
CLT (Cross-Laminated Timber)
DLT (Dowel Laminated Timber)
Other Materials
Application
Floors
Topic
Acoustics and Vibration
Keywords
Dry Floating
Floor Assemblies
Low Frequency
Mass Timber
Research Status
In Progress
Notes
Project contact is Jianhui Zhou
Summary
Sound insulation performance is critical to the broader market acceptance of mass timber buildings in both residential and non-residential building markets. The project aims to develop dry floating floor solutions for mass timber floors with improved sound insulation performance. The specific objectives are: 1. To design floating floor assemblies using wood-based panels such as medium density fiberboard (MDF), gypsum board, and structural concrete panels for mass timber floors with considerations for fire requirements; 2. To evaluate the impact sound insulation performance of developed floor assemblies with a focus in the low-frequency range.
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