ISO 4678:2024

Name: ISO 4678:2024 — Ships and marine technology — Noise measurement method for HVAC system in accommodation spaces
SKU: ISO 4678:2024
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Ships and marine technology — Noise measurement method for HVAC system in accommodation spaces

Название (английский):

ISO 4678:2024

Ships and marine technology — Noise measurement method for HVAC system in accommodation spaces

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 9
Дата публикации:: 24 января 2024 г.
Издание:: ISO IS 4678 edition 1 version 1
ICS:: 13.140

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Описание (английский):

This document provides the instrumentation requirements and measurement procedures for measuring noise from HVAC systems in ship accommodation spaces. Accommodation spaces are defined according to ISO 2923, and include cabins, offices (for carrying out ship’s business), hospitals, messrooms and recreation rooms. Measurement of noise levels in HVAC systems in ship accommodation is performed in the third octave band over the frequency range from 63 Hz to 8 kHz, taking into account the correction of cabin reverberation.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO 4678:2024 - "Ships and marine technology - Noise measurement method for HVAC system in accommodation spaces" specifies instrumentation and procedures for measuring noise from shipboard HVAC systems in accommodation spaces. Measurements are made in third-octave bands from 63 Hz to 8 kHz and include correction for cabin reverberation. The standard targets spaces defined in ISO 2923 (cabins, offices, hospitals, messrooms, recreation rooms) and is intended for use during ship commissioning, troubleshooting and habitability assessments.

Key topics and technical requirements

Frequency and metrics: Third-octave band analysis across 63 Hz–8 kHz; steady-state equivalent sound pressure levels using 30 s stable readings.

Instrumentation:

Class 1 sound level meters / recorders and data sampling compliant with IEC 61672-1.
One-third-octave frequency analyser per IEC 61260-1 and ISO 266 centre frequencies.
Calibration before and after tests using Class 1 acoustic calibrators per IEC 60942.
Use of nose cones and windshields to reduce airflow effects; combined influence limited to ≤ 0.5 dB(A).

Microphone arrangement: Preferred setup uses three microphones on tripods in one plane, equally spaced (β = 120°), at 1 m from the outlet edge with inclination angle α between 30°–45°. One or two mics are allowed where space is restricted.

Procedure highlights:

Measure outlet noise with HVAC running at design flowrates.
Measure background noise with HVAC off; apply energetic averaging from the same microphone positions and correct outlet readings per the standard’s correction method.
Measure reverberation time using interrupted source or integrated impulse response methods following ISO 3382-2, and apply reverberation correction when calculating vent noise levels.
Document measurement uncertainties and produce a comprehensive measurement report (company/personnel, ship and HVAC particulars, instruments, conditions, raw data).

Applications and users

ISO 4678:2024 is practical for:

Ship designers and naval architects verifying acoustic habitability of accommodation spaces.

Shipbuilders and test teams performing commissioning and acceptance tests.

HVAC and acoustic consultants diagnosing noisy outlets and recommending mitigation.

Classification societies, operators and regulators assessing compliance with onboard noise criteria.

Maintenance teams tracking performance changes and verifying retrofit effectiveness.

Related standards

ISO 2923 (accommodation space definitions)

ISO 266 (preferred frequencies)

ISO 3382-2 (reverberation time in ordinary rooms)

IEC 60942, IEC 61260-1, IEC 61672-1 (calibrators, filters, sound level meters)

Keywords: ISO 4678, HVAC noise measurement, ship accommodation, third-octave band, reverberation time, Class 1 sound level meter, marine HVAC acoustics.

ISO 4678:2024

Abstract

Похожие стандарты

Overview

Key topics and technical requirements

Applications and users

Related standards

Технические детали

ISO 2923:1996

Acoustics — Measurement of noise on board vessels

IEC 61672-1:2013

Electroacoustics - Sound level meters - Part 1: Specifications

IEC 61260-1:2014

Electroacoustics - Octave-band and fractional-octave-band filters - Part 1: Specifications

ISO 26683-3:2019

Intelligent transport systems — Freight land conveyance content identification and communication — Part 3: Mo…

IEC 60942:2017

Electroacoustics - Sound calibrators

BS EN ISO 3382-2:2008

Acoustics. Measurement of room acoustic parameters. Reverberation time in ordinary rooms.