本文件规定了工程方法，即往复式内燃机声功率级的测量方法。 本文件适用于ISO 3046-1应用范围内的所有往复式内燃机，以及没有适用国际标准的其他内燃机。 注:除非另有说明，否则在本文件中，往复式内燃机被称为发动机。

This document specifies the engineering method, which is the measurement method of the sound power level for reciprocating internal combustion engines. This document applies to all reciprocating internal combustion engines falling within the field of application of ISO 3046-1 and other internal combustion engines where no suitable International Standard exists. NOTE In this document, reciprocating internal combustion engines are referred to as engines unless otherwise explained.