Overview
ISO 15619:2013 specifies standardized measurement methods and requirements for exhaust silencers installed on reciprocating internal combustion engines. It covers both laboratory (engineering and survey methods) and site measurements to determine acoustic and aerodynamic performance parameters such as sound power level of exhaust noise, insertion loss, and power loss ratio. The standard supports consistent, repeatable testing and reporting for silencers used with engines within the scope of ISO 3046 series.
Key topics and technical requirements
- Measurement scope
- Sound power level (A‑weighted or frequency bands) using sound pressure
- Insertion loss (A‑weighted or frequency bands)
- Power loss ratio (aerodynamic matching)
- Optional transmission loss and pressure loss procedures (see informative annex)
- Measurement methods
- Laboratory engineering method (accuracy grade 2) - higher precision
- Laboratory/site survey method (accuracy grade 3) - for comparative or field tests
- Measurement uncertainty
- Engineering method: standard deviation of reproducibility ≤ 1.5 dB (A‑weighted)
- Survey method: standard deviation of reproducibility ≤ 4.0 dB (A‑weighted)
- One‑third‑octave and octave band reproducibility limits are defined in the standard
- Test setup and environment
- Requirements for test environment, background noise criteria, and acoustic adequacy
- Instrumentation and calibration procedures
- Installation and operation of the engine/noise source for laboratory and site testing
- Measurement & calculation
- Detailed measurement procedures, microphone locations (90° vs 45° directions), and correction methods
- Calculation methods for sound power level, insertion loss, and power loss ratio
- Reporting
- Required information to record about silencer, engine, instrumentation, acoustical environment, and test results
- Test report and annexed procedures for environment qualification and pressure‑loss measurement
Applications and who uses it
ISO 15619:2013 is relevant to:
- Engine manufacturers and OEMs verifying acoustic matching between engines and silencers
- Silencer designers and suppliers validating product performance (insertion loss, pressure loss)
- Acoustic test laboratories performing standardized laboratory and site measurements
- Regulatory bodies and certifiers assessing compliance with noise/emissions requirements
- Acoustical and mechanical engineers involved in noise control, product development, and field diagnostics
Practical uses include acceptance testing, engineering design verification, comparative field surveys, and procurement specifications for exhaust silencers.
Related standards
- ISO 3046-1:2002 (Reciprocating internal combustion engines - Declarations and test methods)
- ISO 3046-3:2006 (Reciprocating internal combustion engines - Test measurement)
Keywords: ISO 15619:2013, exhaust silencers, sound power level, insertion loss, reciprocating internal combustion engines, measurement method, power loss ratio, laboratory measurement, site measurement.