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GB/T 16405-2025 English PDF

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US$274.00 · In stock
Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email.
GB/T 16405-2025: Acoustics - Measurement of insertion loss of ducted silencers without flow - Laboratory survey method
Status: Valid

GB/T 16405: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 16405-2025	274	Add to Cart	3 days	Acoustics - Measurement of insertion loss of ducted silencers without flow - Laboratory survey method	Valid
GB/T 16405-1996	279	Add to Cart	3 days	Acoustics. Measurement of insertion loss of ducted silencers without flow. Laboratory survey method

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Basic data

Standard ID: GB/T 16405-2025 (GB/T16405-2025)
Description (Translated English): Acoustics - Measurement of insertion loss of ducted silencers without flow - Laboratory survey method
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: A59
Classification of International Standard: 17.140
Word Count Estimation: 13,197
Date of Issue: 2025-05-30
Date of Implementation: 2025-12-01
Older Standard (superseded by this standard): GB/T 16405-1996
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration

GB/T 16405-2025: Acoustics - Measurement of insertion loss of ducted silencers without flow - Laboratory survey method

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
ICS 17.140 CCSA59 National Standard of the People's Republic of China Replaces GB/T 16405-1996 Insertion loss measurement of acoustic duct muffler without airflow Simple laboratory method (ISO 11691.2020, IDT) Released on 2025-05-30 2025-12-01 Implementation State Administration for Market Regulation The National Standardization Administration issued

Preface III Introduction IV 1 Scope 1 2 Normative references 1 3 Terms and Definitions 2 4 Test setup and arrangement 2 5 Test Step 5 6 Measurement uncertainty 5 7 Recording content 6 8 Report Content 6 References 8

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1.Structure and drafting rules for standardization documents" Drafting. This document replaces GB/T 16405-1996 "Acoustic duct silencer insertion loss measurement in the absence of airflow laboratory simple Compared with GB/T 16405-1996, in addition to structural adjustments and editorial changes, the main technical changes are as follows. --- Added relevant requirements for modal filters (see 4.3.3); --- Changed the content of measurement uncertainty (see Chapter 6, 1.2 of the.1996 edition); --- Deleted Appendix A (see Appendix A of the.1996 edition). This document is equivalent to ISO 11691.2020 "Acoustic duct silencer - simple laboratory method for measuring insertion loss in the absence of airflow". Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents. This document was proposed by the Chinese Academy of Sciences. This document is under the jurisdiction of the National Technical Committee on Acoustic Standardization (SAC/TC17). This document was drafted by. Shenzhen Zhongya Electromechanical Industry Co., Ltd., Institute of Acoustics, Chinese Academy of Sciences, Tongji University, Beijing Institute of Science and Technology Institute of Urban Safety and Environmental Sciences, Zhejiang University of Science and Technology, Zhejiang University, Hangzhou Aihua Intelligent Technology Co., Ltd., Shanghai Jiaotong University College of Engineering, Shanghai Shenhua Acoustic Equipment Co., Ltd., Shanghai Xinhuajing Environmental Protection Engineering Co., Ltd., and Northwestern Polytechnical University. The main drafters of this document are. Fang Qingchuan, Lü Yadong, Yang Jun, Cheng Mingkun, Sui Fusheng, Yu Wuzhou, Mao Dongxing, Hu Wencheng, Li Xiaokuan, Li Zhengguang, Zhai Guoqing, Xiong Wenbo, Jiang Weikang, He Jinlong, Wang Bing, Chen Ke'an, and Xu Xin. The previous versions of this document and the documents it replaces are as follows. ---First published in.1996 as GB/T 16405-1996; ---This is the first revision.

Introduction

Generally, when the flow velocity at the narrowest cross section of the resistive muffler does not exceed 20m/s, the insertion loss of the muffler is not affected by the airflow. In practical applications, the uneven distribution of airflow needs to be considered, so the upper limit speed of 20m/s is equivalent to the design speed of 10m/s~15m/s. Insertion loss measurement of acoustic duct muffler without airflow Simple laboratory method

1 Scope

This document describes a method for determining the resistance of circular and rectangular resistive silencers and other duct elements used in ventilation and air conditioning systems. Laboratory surrogate tube measurement method for insertion loss in the absence of airflow. NOTE. ISO 7235 describes a laboratory method for the measurement of the insertion loss of duct silencers with airflow. This document is applicable to silencers with a design flow rate not exceeding 15 m/s. This method does not consider the impact of airflow regeneration noise and is only applicable to air The flow regeneration noise does not have a significant impact on the performance of the muffler. Since the design flow rate of most mufflers used in offices and homes is Below 15 m/s, this document provides a more economical method compared to ISO 7235. Due to different sound sources and the existence of pipeline flow fields, the insertion loss value obtained by this measurement method may be different from the on-site measurement results. Different acoustic fields and flow fields in the pipeline will lead to different results. In this paper, the acoustic field is mainly a plane wave mode. The test was carried out and it was found that the measurement results had a definite upper limit of insertion loss due to the influence of lateral sound transmission caused by the vibration of the pipe wall structure. This document is applicable to circular silencers with a diameter of 80 mm to.2000 mm, or rectangular silencers with a cross-sectional area in the same range.

2 Normative references

The contents of the following documents constitute the essential clauses of this document through normative references in this document. For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to This document. ISO 3741 Acoustics-Determining the sound power level and sound energy level of noise sources by sound pressure method - Reverberation chamber precision method Note. GB/T 6881-2023 Acoustics - Determination of sound power level and sound energy level of noise source by sound pressure method - Reverberation chamber precision method (ISO 3741.2010, IDT) Note. GB/T 27025-2019 General requirements for the competence of testing and calibration laboratories (ISO /IEC 17025.2017, IDT) ISO /IEC Guide 98-3 Uncertainty of measurement Part 3.Guide to the expression of uncertainty in measurement Note. GB/T 27418-2017 Evaluation and expression of measurement uncertainty (ISO /IEC Guide 98-3..2008, MOD) IEC 60942 Electroacoustics-Soundcalibrators Note. GB/T 15173-2010 Electroacoustic sound calibrator (IEC 60942.2003, IDT) IEC 61183 Electroacoustics-Random-incidence and diffuse-field calibration of electroacoustic sound level meters Note. GB/T 17312-1998 Random incidence and diffuse field calibration of sound level meters (IEC 61183.1994, eqv) IEC 61260-1 Electroacoustics - Octave-band and fractional-octave-band filters - Part 1.Specifications IEC 61672-1 Electroacoustics-Soundlevelmeters-Part 1.Specification ......

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Tips & Frequently Asked Questions:

Question 1: How long will the true-PDF of GB/T 16405-2025_English be delivered?

Answer: Upon your order, we will start to translate GB/T 16405-2025_English as soon as possible, and keep you informed of the progress. The lead time is typically 1 ~ 3 working days. The lengthier the document the longer the lead time.

Question 2: Can I share the purchased PDF of GB/T 16405-2025_English with my colleagues?

Answer: Yes. The purchased PDF of GB/T 16405-2025_English will be deemed to be sold to your employer/organization who actually pays for it, including your colleagues and your employer's intranet.

Question 3: Does the price include tax/VAT?

Answer: Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries) -- See Avoidance of Double Taxation Agreements (DTAs): List of DTAs signed between Singapore and 100+ countries

Question 4: Do you accept my currency other than USD?

Answer: Yes. If you need your currency to be printed on the invoice, please write an email to Sales@ChineseStandard.net. In 2 working-hours, we will create a special link for you to pay in any currencies. Otherwise, follow the normal steps: Add to Cart -- Checkout -- Select your currency to pay.

Question 5: Should I purchase the latest version GB/T 16405-2025?

Answer: Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version GB/T 16405-2025 even if the enforcement date is in future. Complying with the latest version means that, by default, it also complies with all the earlier versions, technically.