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Cost-Effective 3D Modeling Test on Acoustic Performance of a Single-Glazed Window Following AS 1191

Figure 1. Single Glazed Window

Executive Summary:

This report details a cost-effective 3D modelling study conducted to assess the acoustic performance of single-glazed windows, adhering to the guidelines of AS 1191 and AS/NZS ISO 717.1. The comprehensive evaluation aims to provide insights into the effectiveness of these windows in mitigating airborne sound transmission, considering metrics such as the Weighted Sound Reduction Index (Rw), Spectrum Adaptation Terms (C, Ctr), and other industry benchmarks.


The study focused on utilising advanced 3D modelling techniques, known for their cost-effectiveness compared to physical tests, to analyse the acoustic properties of single-glazed windows, following the standards outlined in AS 1191 and AS/NZS ISO 717.1. The objective was to ensure precise evaluation in line with industry benchmarks.

Benefits of Modeling Approach:

The modelling approach offers several advantages over traditional physical testing:

  1. Cost Efficiency: 3D modelling is a more economical alternative to physical tests, reducing expenses associated with materials, equipment, and logistics.

  2. Time Savings: Modeling allows for quicker assessments, accelerating the evaluation process and enabling faster iterations for design improvements.

  3. Flexibility in Design Iterations: 3D modelling facilitates easy adjustments to window designs, allowing for rapid testing of various configurations to optimise acoustic performance.

Test Specimen:

Single-Glazed Window

Dimensions: 1000 mm (H) x 1000 mm (W) x 45 mm (D)

Glass Material: 6.0 mm Toughened Glass

Frame: Aluminium

Modelling and Calculation Process:

The modelling process, proven to be more economical and efficient than physical tests, strictly adhered to AS 1191 and AS/NZS ISO 717.1 guidelines. This approach allowed for a detailed assessment of the windows' acoustic insulation capabilities. The study considered metrics such as the Weighted Sound Reduction Index (Rw) and Spectrum Adaptation Terms (C, Ctr) to quantify the effectiveness of the windows in reducing airborne sound transmission.


The 3D modelling study yielded the following key results:

  • Weighted Sound Reduction Index (Rw): 30

  • Spectrum Adaptation Terms (C, Ctr): -1, -1

 Figure 2. Single Glazed Window- Sound reduction Index for 1/3 Octave


The findings of this cost-effective 3D modelling study underscore the efficacy of single-glazed windows in mitigating airborne sound transmission. The benefits of the modelling approach, including cost efficiency and design flexibility, contribute to its viability as a valuable tool for assessing and optimising acoustic performance.


Based on the study's outcomes, it is recommended to consider these single-glazed windows for applications where acoustic performance is a critical factor. Further research and real-world testing can provide additional insights into the practical implications and benefits of integrating these windows into diverse architectural contexts.


We extend our gratitude to all those involved in the successful execution of this cost-effective 3D modelling study, contributing to a deeper understanding of the acoustic performance of single-glazed windows in alignment with AS 1191 and AS/NZS ISO 717.1 standards.


• AS 1191-2002 (R2016): “Acoustics; Method for laboratory measurement of airborne sound transmission insulation of building elements”.

• AS/NZS ISO 717.1:2004: “Acoustics; Rating of sound insulation in buildings and of building elements, Part 1: Airborne sound insulation”.

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