Overview
ISO 11690-2:2020 - "Acoustics - Recommended practice for the design of low-noise workplaces containing machinery - Part 2: Noise control measures" is an international guidance document that addresses the technical aspects of controlling audible workplace noise. The standard describes practical noise control measures, defines related acoustical quantities, discusses the expected magnitude of noise reduction, and outlines verification methods for effectiveness. It applies to machines, installations and production processes in workrooms and buildings.
Key topics and technical requirements
- Noise control at source: design-level measures to reduce emissions from machinery (mechanical and fluid-dynamic noise), use of low-noise machines, replacement or modification of components, maintenance and low-noise production technologies.
- Noise control on the transmission path: spatial arrangement of sources, use of enclosures, partial enclosures, barriers, screens and silencers, and application of sound-absorbing materials. Assessment uses insertion loss and other performance metrics.
- Noise control at the work station: local measures focused on receivers and specified work positions to reduce exposure without hindering tasks.
- Verification methods: measurement-based verification of sound sources, noise control devices and workrooms; comparison with noise emission declarations and relevant measurement standards.
- Building acoustics: airborne and structure-borne sound insulation, and acoustical treatment of surfaces are covered to assess room acoustic quality.
- Supporting guidance: informative annexes cover component modification, source arrangement, enclosures, silencers, barriers, surface treatment, structure-borne insulation, partition insulation, and examples of new technologies.
- Scope limit: deals only with audible sound (not infrasound or ultrasound).
Practical applications and users
ISO 11690-2 is designed for practical implementation in workplace design, modification and procurement. Typical uses include:
- Designing low-noise production areas and machine layouts
- Selecting and specifying low-noise machines and silencers
- Designing enclosures, barriers and room treatments to meet noise targets
- Verifying noise control performance through measurements and insertion-loss data
- Integrating noise control into procurement, maintenance and plant planning
Intended users: plant personnel, health & safety officers, acoustical and mechanical engineers, facility managers, architects, purchasing agents and equipment suppliers.
Related standards
- ISO 11690-1:2020 - Acoustics - Recommended practice for the design of low-noise workplaces containing machinery - Part 1: Noise control strategies.
- Other parts of the ISO 11690 series provide complementary strategy and assessment guidance.
Keywords: ISO 11690-2:2020, workplace acoustics, noise control measures, low-noise workplaces, machinery noise control, enclosures, silencers, insertion loss, airborne sound insulation, structure-borne sound.