ISO TR 11688-2-1998 PDF

Full title and description

Acoustics — Recommended practice for the design of low-noise machinery and equipment — Part 2: Introduction to the physics of low-noise design. This technical report explains the physical principles behind noise generation and reduction in machines, and provides measurement and calculation guidance to support low-noise design decisions.

Abstract

ISO/TR 11688-2:1998 gives the physical background for constructive noise‑reduction measures described in the ISO/TR 11688 series. It presents equations and methods that improve understanding of noise sources, transmission paths and radiating parts in machinery; it also describes measurement and calculation procedures suitable for obtaining the necessary data for design comparisons (while noting the equations are generally not suitable for predicting absolute emission levels).

General information

• Status: Published — confirmed (reviewed and confirmed in 2009; remains the confirmed version of the technical report).
• Publication date: 1998-09 (First edition: September 1998).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 21.020 (Characteristics and design of machines, apparatus, equipment); 17.140.20 (Noise emitted by machines and equipment).
• Edition / version: Edition 1 (1998).
• Number of pages: 46 (technical report length).

Scope

This part of ISO/TR 11688 provides the physical background for the design rules and examples given elsewhere in the series. It is intended for use by machine and equipment designers, purchasers and users of machines, and by regulatory and inspection bodies. The report describes relevant measurement and calculation procedures (notably in its sections covering source identification, transmission-path analysis and radiating parts) to supply the information needed for noise‑control design and for comparing alternative design variants.

Key topics and requirements

• Physical principles of airborne and structure-borne sound generation in machinery.
• Identification and characterization of internal sound sources and transmission paths.
• Measurement and calculation methods appropriate for design comparisons (sections on measurements and calculations, including guidance in annex A).
• Use of analytical equations to compare design alternatives (with the explicit note that these equations are generally not suitable for predicting absolute emission levels).
• Guidance promoting consultation of wider acoustical literature to support detailed design decisions.

Typical use and users

Used by mechanical designers and engineers during product design to reduce noise by design; by purchasers and users assessing machine noise characteristics; and by authorities, test laboratories and inspection bodies for guidance on measurement and analysis methods that support low-noise design. The report is primarily advisory and intended to improve understanding and comparison of design options rather than to set fixed emission limits.

Related standards

ISO/TR 11688-2 is part of the ISO/TR 11688 series on recommended practice for low-noise machinery design; closely related is ISO/TR 11688-1 (Part 1: Planning), which addresses planning and overall recommended practice. Other acoustics standards that are often used alongside this technical report include standards for measurement of machine noise and declaration/verification of emission values.

Keywords

acoustics, machine noise, low-noise design, noise control, transmission path, source identification, measurement methods, calculation methods, ISO/TR 11688.

FAQ

Q: What is this standard?

A: ISO/TR 11688-2:1998 is a technical report providing the physical background and recommended measurement/calculation approaches to support the design of low-noise machinery and equipment.

Q: What does it cover?

A: It covers the physics of noise generation and transmission in machines, methods to identify internal sources and transmission paths, equations and calculation approaches for comparing design options, and measurement procedures (with guidance in specific sections and annex A). It is advisory and intended for design support rather than as a predictive emission model.

Q: Who typically uses it?

A: Machine and equipment designers, test laboratories, purchasers and users of machinery, and regulatory or inspection bodies seeking guidance on noise‑control design and supporting measurement/analysis methods.

Q: Is it current or superseded?

A: The technical report was published in September 1998 and was last reviewed and confirmed in 2009; the confirmed 1998 edition remains the current ISO technical report version. Users should check their national adoption or amendment status for any regional changes.

Q: Is it part of a series?

A: Yes — it is Part 2 of ISO/TR 11688. Part 1 (ISO/TR 11688-1:1995) covers planning and overall recommended practice; the series is intended to be used together to support low-noise design of machinery.

Q: What are the key keywords?

A: Acoustics; low-noise design; machine noise; noise control; measurement methods; transmission path; source identification; calculation methods; ISO/TR 11688.