e1265-90中文版-气动排气消音器插入损耗测量用试验方法.docVIP

E 1265 PAGE 1008 Designation: E 1265 - 90 (Reapproved 1995) ε1 An American National Standard编号：E 1265 – 90（1995年重新批准） 美国国家标准 PAGE 997 Standard Test Method for Measuring Insertion Loss of Pneumatic Exhaust Silencers This test method is under the jurisdiction of ASTM Committee E-33 on Environmental Acoustics and is the direct responsibility of Subcommittee E33.08 on Mechanical and Electrical System Noise.本分类 This test method is under the jurisdiction of ASTM Committee E-33 on Environmental Acoustics and is the direct responsibility of Subcommittee E33.08 on Mechanical and Electrical System Noise.本分类由ASTM委员会E-33环境声学委员会管辖，并由E33.08机械及电子系统噪声分委会直接负责。Current edition approved Feb. 23, 1990. Published August 1990. Originally published as E 1265 - 88. Last previous edition E 1265 - 88.现行版本于1990年2月23日批准，并于1990年8月出版。原始版本为E 1265-88。 This standard is issued under the fixed designation E 1265; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript epsilon (ε) indicates an editorial change since the last revision or reapproval.本标准以固定编号E 1265刊发；紧随编号后的数字表示最初采用的年份，或者是修订版的最后修订年份。圆括号中的数字表示必威体育精装版重新批准的年份。上标(ε)表示自上一修订版或重新批准后的编辑性修改。 ε1 Note—Keywords were added editorially in November 1995.注——关键词于1994年12月通过编辑添加。 1. Scope 适用范围 1.1 This test method covers the laboratory measurement of both the acoustical and mechanical performance of pneumatic exhaust silencers designed for quieting com pressed gas (usually air) exhausts from orifices connected to pipe sizes up to 3/4 in. NPT. This test method is not applicable for exhausts performing useful work, such as part conveying, ejection, or cleaning. This test method evaluates acoustical performance using A-weighted sound level measurements.本试验方法涵盖气动排气消音器的声学和机械性能的实验室测量，该消声器是设计用来对连接到最大管尺寸为3/4英寸美制标准锥管螺纹孔排出的压缩气体（通常是空气）进行消声的。本试验方法不适用于做有用功的排气工作，如零件运输、喷射或清洁。本试验方法通过使用A- 1.2 The val