吸音板的声学测试报告解读Interpretation of Acoustic Test Reports for Sound Absorption Panels

This report details sound absorption measurements performed by the University of Salford Acoustic Test Laboratory, an UKAS accredited facility, for Burgeree New Tech Jiangsu Co., Ltd. The testing was conducted on various PET panels on July 11, 2023, with the official report issued on August 4, 2023. The primary objective was to assess the acoustic performance of these panels using standardized methods.

本报告详细介绍了由英国大学萨尔福德声学测试实验室（UKAS认可的实验室）为江苏佰家丽新材料科技股份有限公司进行的吸声测量。测试于2023年7月11日进行，涉及多种PET板，正式报告于2023年8月4日发布。主要目的是使用标准化方法评估这些板的声学性能。

The testing procedure strictly adhered to BS EN ISO 354:2003, "Acoustics – Measurement of Sound Absorption in a Reverberation Room". The single-number weighted sound absorption coefficient, αW, and practical sound absorption coefficients, αp, were calculated in accordance with BS EN ISO 11654:1997, "Acoustics – Sound absorbers for use in buildings – Rating of sound absorption". This ensures a standardized and reliable evaluation of the materials' sound-absorbing capabilities.

测试过程严格遵循了**BS EN ISO 354:2003，“声学——混响室中吸声测量”标准。单值加权吸声系数αW和实用吸声系数αp的计算则依据BS EN ISO 11654:1997，“声学——建筑用吸声材料评级”**标准。这确保了对材料吸声能力的标准化和可靠评估。

Measurements were performed in the University of Salford's large reverberation room, which is specifically designed with hard, non-parallel surfaces to achieve long, uniform sound decays. To enhance sound field diffusivity, 18 plywood panels were strategically hung within the room. Sound excitation was provided by two omnidirectional dodecahedron loudspeakers, with sound levels monitored by six microphones. The room has a volume of 221 m³ and a total surface area of 224 m², allowing for test samples up to 12.79 m² in size. The procedure involved measuring the sound decay rate both with and without the sample in place, covering a frequency range from 100 Hz to 5000 Hz in one-third octave bands. For each frequency band, an average reverberation time was calculated from 60 decays (five decays at six microphone positions for each of two loudspeaker positions). Critical equipment included a 1/3 octave band real-time analyser, power amplifiers, sound calibrators, and various types of condenser microphones, along with environmental sensors to record temperature and humidity.

测量在萨尔福德大学的大型混响室中进行，该混响室专门设计有坚硬、非平行的表面，以实现长而均匀的声衰减。为了增强声场的扩散性，室内策略性地悬挂了18块胶合板。声音激励由两个全向十二面体扬声器提供，声级由六个麦克风监测。该房间体积为221立方米，总表面积为224平方米，允许测试最大12.79平方米的样品。测试过程包括测量有样品和无样品两种情况下的声衰减速率，频率范围为100赫兹至5000赫兹的三分之一倍频程带。对于每个频段，通过60次衰减（在六个麦克风位置的每次两次扬声器位置各五次衰减）计算平均混响时间。关键设备包括三分之一倍频程实时分析仪、功率放大器、声音校准器和各种电容式麦克风，以及记录温度和湿度的环境传感器。

The report covers 15 distinct PET panel configurations, all made from PET material and having a standard sample area of 4000 × 3000 mm. These configurations varied in panel thickness (9mm, 12mm, 18mm, 24mm) and mounting type. Two main mounting types were tested: Type A Mounting, where panels were laid directly onto the concrete floor of the reverberation room, and Type E Mounting, which involved mounting panels on an MDF frame to create an air gap of either 50mm, 100mm, or 200mm from the concrete floor. For Type E mounting, the cavity behind each panel was partitioned into six separate chambers.

报告涵盖了15种不同的PET板配置，所有样品均由PET材料制成，标准样品面积为4000 × 3000毫米。这些配置在面板厚度（9毫米、12毫米、18毫米、24毫米）和安装类型上有所不同。测试了两种主要安装类型：A型安装，即面板直接铺设在混响室的水泥地板上；以及E型安装，通过将面板安装在MDF框架上，使其与水泥地板之间形成50毫米、100毫米或200毫米的空气间隙。对于E型安装，每个面板后面的空腔都被分隔成六个独立的腔室。

The test results demonstrate a clear trend: increasing both panel thickness and the presence of an air gap significantly improves the sound absorption performance, particularly at lower frequencies. For Type A Mounting (direct contact), the weighted sound absorption coefficient (αW) ranged from 0.25 for 9mm and 12mm panels (Classification E) to 0.45 for 18mm panels (Classification D), and 0.50 for 24mm panels (Classification D). This indicates that thicker panels absorb more sound, even when directly applied.

测试结果显示出明显的趋势：增加面板厚度并设置空气间隙能显著提高吸声性能，尤其是在较低频率下。对于A型安装（直接接触），加权吸声系数（αW）从9毫米和12毫米面板的0.25（E级）提高到18毫米面板的0.45（D级），以及24毫米面板的0.50（D级）。这表明即使直接安装，更厚的面板也能吸收更多声音。

The impact of an air gap was even more pronounced. For Type E-50 Mounting (50mm air gap), the αW values substantially increased, with 9mm and 12mm panels achieving 0.65 (Classification C), 18mm panels reaching 0.80 (Classification B), and 24mm panels reaching 0.85 (Classification B). Further increasing the air gap to 100mm (Type E-100 Mounting) resulted in αW values of 0.90 for 9mm and 12mm panels (Classification A), 0.95 for 18mm panels (Classification A), and a remarkable 1.00 for 24mm panels (Classification A). The 200mm air gap (Type E-200 Mounting) showed similar high performance, with 9mm panels achieving 0.90 (Classification A), 12mm panels 0.95 (Classification A), and both 18mm and 24mm panels reaching αW values of 1.00 (Classification A).

空气间隙的影响更为显著。对于E-50型安装（50毫米空气间隙），αW值显著提高，9毫米和12毫米面板达到0.65（C级），18毫米面板达到0.80（B级），24毫米面板达到0.85（B级）。将空气间隙进一步增加到100毫米（E-100型安装），9毫米和12毫米面板的αW值达到0.90（A级），18毫米面板达到0.95（A级），而24毫米面板更是达到了惊人的1.00（A级）。**200毫米空气间隙（E-200型安装）**也表现出类似的高性能，9毫米面板达到0.90（A级），12毫米面板达到0.95（A级），而18毫米和24毫米面板的αW值均达到1.00（A级）。

In summary, the results indicate that these PET panels are effective sound absorbers. Their performance is directly enhanced by increased material thickness and, more dramatically, by the introduction of an air gap behind the panel, allowing them to achieve excellent sound absorption classifications, especially at higher air gap distances.

总而言之，结果表明这些PET板是有效的吸声材料。它们的性能直接通过增加材料厚度而增强，更显著的是通过在面板后面引入空气间隙，使其能够达到卓越的吸声等级，特别是在较大的空气间隙距离下。