测定减少发动机进气或排气声级消声效果的测量程序

[中文适用范围]： 本 SAE 推荐实践规定了用于测量消音器系统降低内燃机进气或排气声级有效性的仪器、环境和测试程序。系统应包括进气或排气消声器、相关管道和部件。本程序适用于发动机测功机测试，不一定适用于车辆测试（参见附录 A）。排气或进气系统对整个机器声级的影响必须使用其他程序来确定。该过程可连续应用于各种消音器配置以确定 r [外文原描述]： This SAE Recommended Practice sets forth the instrumentation, environment, and test procedures to be used in measuring the silencer system effectiveness in reducing intake or exhaust sound level of internal combustion engines. The system shall include the intake or exhaust silencer, related piping, and components. This procedure is intended for engine-dynamometer testing and is not necessarily applicable to vehicle testing (see Appendix A ). The effect of the exhaust or intake system on the sound level of the overall machine must be determined using other procedures. This procedure may be successively applied to various silencer configurations to determine relative effectiveness for that engine. Insertion loss for individual silencers may be calculated through measurement of the silenced and unsilenced system.Cross Reference: ANSI/S1.13,ANSI/S1.4,J184_201408