声学 飞行中飞机内声压级的测量

[中文适用范围]： 本国际标准规定了稳定飞行条件下航空器内部机组人员和乘客位置声压级测量和报告的仪器和测试程序的要求。 声压级可用于确定用于描述飞行器内部的声学环境的各种量。 这些程序旨在确保测试结果的一致性，并为确定测量不确定度提供基础。 2 本国际标准提供了从麦克风到读出设备的完整测量系统的电声性能规范。 只要整个测量系统符合本国际标准的规范，就可以选择测量系统的各个单独组件。 3 首选测量程序包括记录声压信号，随后分析为三分之一倍频程声压级。 可以对三分之一倍频程的声压级进行直接测量。 [外文原描述]： 1.1 This International Standard specifies requirements for instruments and test procedures for the measurement and reporting of sound pressure levels at crew and passenger locations in the interior of aircraft under steady flight conditions. The sound pressure levels may be used to determine various quantities for describing the acoustical environment in the interior of the aircraft. The procedures are intended to ensure uniformity in test results and to provide the basis for determination of measurement uncertainties. 1.2 This International Standard provides electroacoustical performance specifications for a complete measurement system from a microphone to the readout device. Various individual components of a measurement system may be selected so long as the total measurement system conforms to the specifications of this International Standard. 1.3 The preferred measurement procedure involves the recording of sound pressure signals with subsequent analysis into one-third-octave band sound pressure levels. Direct measurements may be made of one-third-octaveband sound pressure levels.