DIN EN ISO 11688-2-2001 声学.低噪声机械和设备推荐设计惯例.第2部分:低噪声设计的物理学说明
Acoustics - Recommended practice for the design of low-noise machinery and equipment - Part 2: Introduction to the physics of low-noise design (ISO/TR 11688-2:1998); German version EN ISO 11688-2:2000
The document describes the physical backgrounds of low-noise design rules for machinery and equipment given in DIN EN ISO 11688-1. It thus serves to detail the EU machinery safety directive (89/392/EEC). This standard explains the sound generation and propagation mechanisms in machinery, equipment and vehicles. It is distinguished between internal sources, transmission paths inside the machines and radiation from its boundaries. The document contains a glossary with definitions of thirteen terms.