Abstract Thermal cladding systems have developed and modernised since the first systems were implemented, and predictions of single figure sound insulation improvement, ΔRW, based on the natural frequency, f0, of the spring-mass covering may no longer be reliable. To identify aspects of the compound acoustic behaviour due to multiple power flow paths of the thermal insulating system, a statistical energy analysis (SEA) based prediction model was developed. A simplified calculation of sound insulation improvement, ΔR, is described, allowing the high frequency (f > f0) behaviour of thermal cladding systems to be predicted. A parametric study in which the impact of different construction materials in the model is discussed; the damping constants, elastic properties of the interlayer and fixings, number of fixings, thickness and material properties (including bending stiffness) of the weatherproof outer layer and the heavyweight wall are assessed. While agreement within 4.0 dB (mean absolute differences) between calculated and measured results for thick render (≥8.0 mm) and curtain wall systems can be obtained at high frequencies (f > f0) using the simplified methodology, this approach was not successful at predicting single figure values. This is because single figure values are weighted towards the low frequencies. Correlation of calculated f0 with measured ΔRW is slightly improved (r.m.s. differences of 2.62 compared with 3.21 using the f0 calculation methodology in EN ISO12354 Annex D) when a modified method to calculate the combined stiffness is used. To improve predictions further, a methodology must be developed to obtain the transfer function, Ytr, used to calculate non-resonant coupling loss factor due to the spring-mass resonance of thermal cladding on the heavyweight wall. The mobility of the connections, Yc, should also be accurately characterised to ensure accurate predictions at high frequencies.

中文翻译：

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热包覆系统声学特性的参数研究

摘要 自从第一个系统实施以来，热覆层系统已经发展和现代化，基于弹簧质量覆盖物的自然频率 f0 的单一数字隔音改进 ΔRW 的预测可能不再可靠。为了识别由于隔热系统的多个功率流路径而导致的复合声学行为的各个方面，开发了基于统计能量分析 (SEA) 的预测模型。描述了隔音改进的简化计算，ΔR，允许预测热覆层系统的高频 (f > f0) 行为。一个参数研究，其中讨论了模型中不同建筑材料的影响；阻尼常数、夹层和固定件的弹性特性、固定件数量、评估了防风雨外层和重量级墙的厚度和材料特性（包括弯曲刚度）。虽然使用简化方法可以在高频 (f > f0) 下获得厚抹灰 (≥ 8.0 mm) 和幕墙系统的计算和测量结果之间的 4.0 dB（平均绝对差）内的一致性，但这种方法在预测方面并不成功单个数字值。这是因为单个数字值向低频加权。当使用改进的方法来计算组合刚度时，计算的 f0 与测量的 ΔRW 的相关性略有改善（rms 差异为 2.62，而使用 EN ISO12354 附录 D 中的 f0 计算方法为 3.21）。为了进一步改进预测，必须开发一种方法来获得传递函数，Ytr，用于计算由于厚壁上热覆层的弹簧质量共振引起的非共振耦合损耗因子。还应准确表征连接的移动性 Yc，以确保在高频下进行准确预测。