ISO 15186-2:20 03规定了一种声强方法来确定墙壁、地板、门、窗和小型建筑构件的原位隔音效果。它旨在用于必须在存在侧翼传输的情况下进行的测量。它可用于为侧翼传输的诊断分析提供声功率数据或测量侧翼隔音参数。 ISO 15186-2:20 03可由无法满足ISO 15186-1要求的实验室使用，ISO 15186-1涉及没有或很少侧翼传输的实验室测量。ISO 15186-3涉及实验室条件下的低频测量。 ISO 15186-2:20 03还描述了侧翼透射对使用指定方法进行的测量的影响，以及如何使用强度测量 ——将建筑构件的现场隔音与抑制侧翼的实验室测量结果（即ISO 140-3）进行比较， ——对建筑元素的部分贡献进行排序，以及 ——测量一个或多个传输路径的侧翼声音降低指数（用于验证预测模型，例如EN 12354-1中给出的预测模型）。 该方法给出了与频率相关的空气隔音值。通过应用ISO 717-1，它们可以转换成表征声学性能的单个数字。 当分别测量单个小型和大型建筑元件时，该强度方法的再现性估计等于或优于ISO 140-10和ISO 140-4方法的再现性。

ISO 15186-2:2003 specifies a sound intensity method to determine the in-situ sound insulation of walls, floors, doors, windows and small building elements. It is intended for measurements that have to be made in the presence of flanking transmission. It can be used to provide sound power data for diagnostic analysis of flanking transmission or to measure flanking sound insulation parameters. ISO 15186-2:2003 can be used by laboratories that could not satisfy the requirements of ISO 15186-1, which deals with laboratory measurements with no or little flanking transmission. ISO 15186-3 deals with measurements under laboratory conditions, at low frequencies. ISO 15186-2:2003 also describes the effect of flanking transmission on measurements made using the specified method, and how intensity measurements can be used -- to compare the in-situ sound insulation of a building element with laboratory measurements where flanking has been suppressed (i.e. ISO 140-3), -- to rank the partial contributions for building elements, and -- to measure the flanking sound reduction index for one or more transmission paths (for validation of prediction models such as those given in EN 12354-1). This method gives values for airborne sound insulation, which are frequency dependent. They can be converted into a single number, characterizing the acoustic performance, by application of ISO 717-1. The reproducibility of this intensity method is estimated to be equal to or better than that of the methods of ISO 140-10 and ISO 140-4, when measuring a single small and large building element, respectively.