GB/T 41886-2022 English PDF

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GB/T 41886-2022: Requirements for cabin acoustic design of transport aircraft
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Basic data

Standard ID: GB/T 41886-2022 (GB/T41886-2022)
Description (Translated English): Requirements for cabin acoustic design of transport aircraft
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: V25
Word Count Estimation: 22,223
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration

GB/T 41886-2022: Requirements for cabin acoustic design of transport aircraft

---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.
Requirements for cabin acoustic design of transport aircraft ICS 49.025.01 CCSV25 National Standards of People's Republic of China Acoustic design requirements for transport aircraft cabins Published on 2022-10-12 2022-10-12 Implementation State Administration for Market Regulation Released by the National Standardization Administration directory Preface III Introduction IV 1 Scope 1 2 Normative references 1 3 Terms, Definitions and Abbreviations 1 3.1 Terms and Definitions 1 3.2 Abbreviations 3 4 General Requirements 3 4.1 Design basis 3 4.2 Design Criterion 4 4.3 Design Content 4 4.4 Design Program 6 4.4.1 Overview 6 4.4.2 The establishment of noise indicators in cabins7 4.4.3 Prediction of cabin noise 8 4.4.4 Sound insulation and sound absorption design 8 4.4.5 Airborne system/equipment noise control8 4.4.6 Vibration and noise reduction design of power system 8 5 Detailed requirements8 5.1 Prediction of cabin noise and allocation of indicators for each sub-system 8 5.2 Siding structure and interior acoustic design 9 5.2.1 Design requirements for sound insulation of wall panel structures 9 5.2.2 Sound absorption design requirements for interior systems 9 5.3 Acoustic Design and Installation of Powertrain 10 5.3.1 Design requirements for engine silencing nacelles 10 5.3.2 Design requirements for vibration reduction installation of power system 10 5.4 Acoustic Design of Airborne Systems 10 5.4.1 Environmental control system fan acoustic design requirements 10 5.4.1.1 Evaluation of radiated noise of fans of environmental control system 10 5.4.1.2 Fan installation requirements for environmental control system 10 5.4.2 Acoustic Design Requirements for Refrigeration Components of Environmental Control System 10 5.4.2.1 Evaluation of radiated noise of refrigeration components 10 5.4.2.2 Refrigeration module installation requirements 10 5.4.3 Acoustic Design Requirements for Environmental Control System Ventilation Device 11 5.4.4 Environmental control system piping acoustic design requirements 11 5.4.5 Muffler design requirements for environmental control system 11 5.4.6 Acoustic Design Requirements for Airborne Hydraulic System 11 5.4.7 Acoustic design requirements for other airborne equipment 12 6 Verification Requirements 12 6.1 Sound insulation and interior sound absorption test of wall panel structure 12 6.1.1 Sound insulation performance test of wall panel structure 12 6.1.2 Sound absorption test of interior materials 12 6.2 Power System Noise and Vibration Isolation Test 12 6.2.1 Acoustic performance test of dynamic system 12 6.2.2 Vibration and isolation performance test of power system installation 13 6.3 Airborne system/equipment noise measurements 13 6.3.1 Acoustic test of environmental control system 13 6.3.2 Acoustic characteristic test of other airborne systems/equipment 13 6.4 Cabin noise measurement 13 Appendix A (Informative) Acoustic Design Relevant Calculation Formula 14

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 of Standardization Documents" drafted. Please note that some content of this document may be patented. The issuing agency of this document assumes no responsibility for identifying patents. This document is proposed and managed by the National Aircraft Standardization Technical Committee (SAC/TC435). This document is drafted by. China Aviation Comprehensive Technology Research Institute, China Aircraft Strength Research Institute, Commercial Aircraft Corporation of China, Ltd. Haiji Aircraft Design and Research Institute, Commercial Aircraft Corporation of China, and AVIC XAC Civil Aircraft Co., Ltd. The main drafters of this document. Huang Wenchao, Chen Yingchun, Lv Baoliang, Yan Hao, Hou Feng, Gao Liwen, Xu Kangle, Xu Honggang, Jiang Yu, Pi Runge.

Introduction

This document is jointly prepared by experts in the aviation field of China and Russia under the working mechanism of the Sino-Russian Civil Aircraft Standards Task Force. This document is related to Russia The main technical content of the national standard GOSTR70066-2022 remains the same. Acoustic design requirements for transport aircraft cabins

1 Scope

This document specifies general technical requirements for the design and verification of cabin acoustics during the development of transport aircraft. This document applies to the design and verification of cabin acoustics in transport aircraft. For other aircraft types to carry out cabin acoustic design and verification, you can also refer to this document. The relevant content of the file is executed.

2 Normative references

The contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, dated citations documents, only the version corresponding to that date applies to this document; for undated references, the latest edition (including all amendments) applies to this document. GB/T 3767 Acoustic sound pressure method—Engineering method for determining sound power level of noise source and sound energy level of approximate free field above reflecting surface GB/T 3947 Acoustic terminology GB/T 6881.1 Acoustic sound pressure method Determination of noise source sound power level Reverberation chamber precision method GB/T 6882 Acoustic sound pressure method Determination of sound power level and sound energy level of noise source anechoic room and semi-anechoic room precision method GB/T 16405 Simple laboratory method for measuring insertion loss of acoustic duct muffler without airflow GB/T 16538 Acoustic Sound Pressure Method for Determination of Noise Source Sound Power Level Field Comparison Method GB/T 18696.1 Measurement of sound absorption coefficient and acoustic impedance in acoustic impedance tubes - Part 1.Standing wave ratio method GB/T 18696.2 Measurement of sound absorption coefficient and acoustic impedance in acoustic impedance tubes - Part 2.Transfer function method GB/T 20247 Acoustic reverberation room sound absorption measurement GB/T 20248 Measurement of sound pressure level in aircraft cabin during acoustic flight GB/T 25516 Laboratory Measurement Methods for Acoustic Duct Mufflers and Duct End Units Insertion Loss, Airflow Noise and Total Pressure loss HB7126 Measurement of Sound Absorption Coefficient of Aeronautical Materials and Components by Reverberation Chamber Method HB8525 Civil Aircraft Development Program CCAR-25-R4 Airworthiness Standard for Transport Aircraft (March 11,.2016 Ministry of Transport) CCAR-33-R2 Aviation Engine Airworthiness Regulations (March 17,.2016 Ministry of Transport) 3 Terms, Definitions and Abbreviations 3.1 Terms and Definitions The terms and definitions defined in GB/T 3947 and the following apply to this document. 3.1.1 decibel decibel A unit to describe sound pressure level. Note. Decibel is expressed in dB. ......

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