ISO 12354-2:2017规定了用于估算建筑物房间间冲击声隔声的计算模型，主要使用测量数据（表征参与建筑构件的直接或间接侧面传输）以及结构构件中声音传播的理论推导方法。 根据ISO 717-1，描述了一个详细的模型，用于在1/3倍频程100 Hz至3150 Hz的频带内进行计算，如果元件数据和连接数据可用，可能会扩展到1/3倍频程50 Hz（见附录E）；根据计算结果，可确定建筑物的单个数量等级。由此推导出一个适用范围有限的简化模型，使用元件的单数额定值直接计算单数额定值； 使用简化模型计算的表观冲击声压级的不确定性可根据ISO 12354？1:2017附件K（见第5条）中描述的方法确定。 ISO 12354-2:2017描述了计算方案的原理，列出了相关数量，并定义了其应用和限制。

ISO 12354-2:2017 specifies calculation models designed to estimate the impact sound insulation between rooms in buildings, primarily using measured data which characterize direct or indirect flanking transmission by the participating building elements and theoretically-derived methods of sound propagation in structural elements. A detailed model is described for calculation in frequency bands, in the frequency range 1/3 octave 100 Hz to 3150 Hz in accordance with ISO 717？1, possibly extended down to 1/3 octave 50 Hz if element data and junction data are available (see Annex E); the single number rating of buildings can be determined from the calculation results. A simplified model with a restricted field of application is deduced from this, calculating directly the single number rating, using the single number ratings of the elements; the uncertainty on the apparent impact sound pressure level calculated using the simplified model can be determined according to the method described in ISO 12354？1:2017, Annex K (see Clause 5). ISO 12354-2:2017 describes the principles of the calculation scheme, lists the relevant quantities and defines its applications and restrictions.