Overview
ISO 9052-1:1989 is an international standard developed by ISO Technical Committee ISO/TC 43 focused on acoustics and specifically on the determination of dynamic stiffness of materials used under floating floors in dwellings. This standard provides a precise test method for measuring the dynamic stiffness per unit area of resilient materials with smooth surfaces applied as continuous layers beneath floating floors.
Dynamic stiffness critically affects sound insulation performance in residential buildings, influencing the reduction of impact noise and vibrations transmitted through floor structures. ISO 9052-1:1989 defines how to measure this parameter reliably, ensuring consistency and comparability for materials used in floating floor systems.
The test applies to resilient materials subjected to loadings between 0.4 kPa and 4 kPa and excludes materials used in wall linings or machinery foundations where different load and acoustic requirements exist.
Key Topics
- Dynamic stiffness per unit area (s’): Ratio of dynamic force to dynamic displacement for a resilient material sample, expressed in meganewtons per cubic meter (MN/m³).
- Test specimen requirements: Square specimens measuring 200 mm × 200 mm with smooth surfaces (irregularities less than 3 mm). Specimens must be covered with waterproof plastic foil and a layer of plaster of Paris to ensure even distribution of load and precise vibration measurement.
- Resonant frequency measurement: Uses resonance methods with a spring-and-mass setup where the sample acts as the spring and a steel load plate as the mass. The load plate dimensions and mass are standardized to avoid bending waves.
- Excitation methods: Sinusoidal signals are the reference method for resonant frequency identification, with white noise and pulse signals also accepted. Excitation force varies depending on the expected stiffness of the material.
- Airflow resistivity impact: The dynamic stiffness calculation adjusts depending on the airflow resistivity of the material. Separate formulas are given for high, intermediate, and low resistivity ranges, referencing ISO 9053 for airflow resistivity measurement.
- Test report requirements: Detailed reporting includes the test method reference, material description and dimensions, excitation method, environmental conditions, measured frequencies, and calculated dynamic stiffness values.
Applications
ISO 9052-1:1989 is essential for manufacturers, acoustical engineers, and building professionals involved in:
- Quality control and production testing of resilient materials designed for acoustic insulation under floating floors.
- Acoustic design of dwellings to achieve improved sound insulation performance, particularly for impact noise reduction.
- Material comparison and specification in building projects requiring floating floors to meet regulatory or project-specific acoustic standards.
- Research and development in developing new resilient materials and flooring systems optimized for vibration and sound insulation.
By standardizing the dynamic stiffness measurement, the standard helps promote better design decisions that enhance occupant comfort and comply with sound insulation building regulations.
Related Standards
- ISO 7626-2: Experimental determination of mechanical mobility, relevant for vibration measurements complementary to dynamic stiffness tests.
- ISO 9053: Acoustics – Materials for acoustical applications – Determination of airflow resistance, critical for accurate application of airflow resistivity adjustments in dynamic stiffness calculations.
- ISO 7626-5 (in preparation): Impact excitation methods applicable for extended vibration analysis techniques.
- ISO 9052-2 (forthcoming): Dynamic stiffness determination for materials used in technical floating floors and sound equipment insulation.
Understanding and applying ISO 9052-1:1989 in conjunction with these related standards ensures a comprehensive approach to acoustic material evaluation and building acoustics design.
Keywords: ISO 9052-1, dynamic stiffness, floating floors, resilient materials, acoustic insulation, vibration measurement, sound insulation, airflow resistivity, building acoustics, impact noise reduction.
Open preview (PDF)Acoustics — Determination of dynamic stiffness — Part 1: Materials used under floating floors in dwellings