【英文标准名称】:Acoustics-Determinationofsoundpowerlevelsofnoisesourcesusingsoundpressure-Engineeringmethodinanessentiallyfreefieldoverareflectingplane
【原文标准名称】:声学声压法测定噪声源声功率级一个反射面上方近似自由场中的工程法
【标准号】:ISO3744-1994
【标准状态】:作废
【国别】:国际
【发布日期】:1994-05
【实施或试行日期】:
【发布单位】:国际标准化组织(IX-ISO)
【起草单位】:ISO/TC43
【标准类型】:()
【标准水平】:()
【中文主题词】:数学计算;方法;试验设备;规范(验收);测定;试验;精密度;声压;定义;计算方法;声级;声源;噪声;声强;反射的;测量仪器;试验条件;噪声测量;声学测量;包络面法;声学;噪声(环境的);声功率;噪声源;声学试验
【英文主题词】:Absorption;Acousticmeasurement;Acoustictesting;Acoustics;Calibration;Clay;Definitions;Determination;Earprotectors;Envelopingsurfacemethods;Environment;Ergonomics;Externalnoise;Fixings;Installations;Mathematicalcalculations;Measurement;Measurementduration;Measuringinstruments;Measuringsurfaces;Measuringtechniques;Methods;Methodsofcalculation;Microphones;Noise;Noise(environmental);Noisemeasurements;Noisesources;Operation;Precision;Reflective;Rooms;Sound;Soundabsorption;Soundfields;Soundintensity;Soundlevel;Soundlevels;Soundpower;Soundpressure;Soundsources;Specification(approval);Standarddeviation;Testequipment;Testing;Testingconditions
【摘要】:Specifiesamethodofmeasurement.Givesrequirementsforthetestenvironmentandinstrumentation,aswellastechniquesforobtainingthesurfacesoundpressurelevelfromwhichthesoundpowerlevelofthesourceiscalculated,leadingtoresultswhichhaveagrade2accuracy.
【中国标准分类号】:Z32
【国际标准分类号】:17_140_01
【页数】:31P;A4
【正文语种】:英语


Product Code:SAE ARP4256
Title:Design Objectives for Liquid Crystal Displays for Part 25 (Transport) Aircraft
Issuing Committee:A-4ed Electronics Display Subcommittee
Scope: This document covers monocrhome and color LCDs (transmissive, transflective, and reflective), both matrixed and segmented in format, and is applicable to the following types of displays: a. flight and navigation displays; b. engine, systems, and warning devices; and c. control displays. In this document the terms 'LCD', 'LCD Display', 'Display', and 'Instrument' are synonymous and encompass the display system (e.g., LCD device, drivers, backlight, display processor, etc.), not just the device. This document recommends design and performance criteria for liquid crystal displays (LCDs) on the flight deck of aircraft subject to Part 25 certification. It is intended as guidance for the certifying authority. A secondary purpose is to share information about the unique characteristics of LCDs and how they relate to the flight deck.