1.1 该分类提供了一种确定额定值的方法，该额定值可用于比较标准攻丝机产生并通过不同地板-天花板组件传输的冲击噪声水平。 1.2 评级的名称由调用该分类的测试方法指定。 1.3 该分类仅适用于使用测试方法中所述的标准攻丝机获得的三分之一倍频程带冲击噪声数据 E492 和 E1007年 . 1.4 调用此分类的测试方法包括: 1.4.1 试验方法 E492 –单数额定值称为冲击绝缘等级（IIC）。 1.4.2 试验方法 E1007年 –单数字额定值称为表观冲击绝缘等级（AIIC）、冲击声额定值（ISR）和归一化冲击声额定值（NISR）。 1.4.3 试验方法 E2179年 –单数值额定值称为冲击绝缘等级变化（ΔIIC）。 1.5 本标准并非旨在解决与其使用相关的所有安全问题（如有）。 本标准的用户有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.6 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。 ====意义和用途====== 4.1 随着地板-天花板结构的冲击声衰减增加，额定值增加。该额定值可供建筑师、建筑商、规范和规范机构用于建筑施工中的声学设计目的。 4.2 该额定值仅严格适用于测试方法中定义的标准攻丝机的励磁 E492 和 E1007年 . 它不处理100 Hz以下的低频声音，这些声音通常是在轻托梁地板上行走时产生的。 当托梁结构中的构件松动且居住者在地板上行走时，它也不会处理托梁结构中可能出现的吱吱声、嘎吱声或卡嗒卡嗒声。 4.3 该分类只能用于三分之一倍频程数据。

1.1 This classification provides a method for determining a rating that can be used to compare the levels of impact noise generated by a standard tapping machine and transmitted through different floor-ceiling assemblies. 1.2 The name given to the rating is assigned by the test method that invokes this classification. 1.3 This classification is applicable only to one third octave band impact noise data obtained using the standard tapping machine described in Test Methods E492 and E1007 . 1.4 Test methods that invoke this classification include: 1.4.1 Test Method E492 – the single-number rating is called impact insulation class (IIC). 1.4.2 Test Method E1007 – the single-number ratings are called apparent impact insulation class (AIIC), impact sound rating (ISR), and normalized impact sound rating (NISR). 1.4.3 Test Method E2179 – the single-number rating is called the change in impact insulation class (ΔIIC). 1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 4.1 The rating increases as the impact sound attenuation of the floor ceiling structure increases. The rating can be used by architects, builders, and specification and code authorities for acoustical design purposes in building constructions. 4.2 The rating strictly only applies to excitation by the standard tapping machine defined in Test Methods E492 and E1007 . It does not deal with low frequency sounds below 100 Hz that are typically generated below lightweight joist floors when they are walked on. Nor does it deal with the squeaking, crunching or rattling sounds that can occur in joist construction when elements in the construction are loose and occupants walk on the floor. 4.3 This classification shall only be used with one-third octave band data.