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1、实验(7)空气声隔声测量一、实验目的和要求了解如何减少外界的声音传入室内，或者室内的噪声传入邻室形成干扰。通过实验加强 对墙体、楼板、和门窗等构件的隔声性能的认识，有利于合理的进行隔声设计和施工。二、实验内容测试办公室围护墙的空气声隔声性能。三、测试原理 根据建筑声学原理，判断隔墙降低房间噪声实际效果的最终指标是：隔墙一边的噪声发 声室的声压级与另一边受声室的声压级差D (D=L -L )。因此，对隔墙空气声隔绝量的测试 p1 p2就归结为测量隔墙一边的噪声发声室与另一边的受声室的声压级差。再根据空气声隔声量 R - L - L + 101g SAplp 2一共测试100-3150Hz的16个
2、1/3倍频带的隔声量，得到隔声曲线，并按国家标准建 筑隔声评价标准GB/T50121-2005求得计权隔声R。w0.161VA :受声室吸声量 A =(T60 :混响时间，实验(6)室内混响时间测定中测T60得)L :声源室的平均声压级P1L :受声室的平均声压级P2D：声源室与受声室平均声压级差 D=L -LP1 P2四、测试设备实验室(声源室、受声室)、噪声信号源、滤波器、GZ021-A功率放大器、全指向声源、JT121声学分析仪、HS5671A型噪声频谱分析仪、卷尺五、实验步骤1、测试对象:由于测试环境限制，因此选择墙体两侧的房间，一为声源室，另一为受 声室，两房间中间隔墙为测试试件。2
3、、按要求布置好声源和测点位置，关闭好门窗，接好仪器设备。仪器应事先做好核对 工作，并作必要的预热。3、将传声器放在规定的测点处，声源室和受声室的测点数都不少于3 个，每个测点布 置两名组员，其中一个观察，另一个负责记录数据。4、调整信号源，发出1003150HZ中心频率的1/3倍频程的白噪声。5、测量并计算平均声压级L和L ,每一个测点的每一频率直接读取其声压级平均值p1 p2或读取几个值后再求其平均值。最后再求每一频率几个测点的平均声压级值，则为该频率的 声压级。6、受声室吸声量的测量，该数据已由“实验(6) 室内混响时间测定”中测得其混响时 间而算出了。六、注意事项1、声源系统应稳定，在测
4、量的频率范围内具有连续的频率。2、声源应具有足够的声功率，保证受声室内任何一频带的声压级比环境噪声声压级至 少高 10dB。3、受声室的混响时间不能太长，最好不大于2s。4、传声器放置高度应距地面1.5m以上，各测点之间距离不小于1.5m。5、HS5671A 型噪声频谱分析仪在测量之前应进行校准。6、测量时房间的门窗必须关闭，防止外界的噪音干扰。7、注意分析仪的量程调整，减少实验误差。&所有测点距离距离房间边界或扩散体应大于0.7m9.测点位置取 3 个点，每个位置至少测两次混响时间七、实验数据及处理容积 V： 4.1X5.5X6.9=155.595m2 , 试件面积 S： (2+1.5)X5
5、.5=19.25m255005500声源测点发声室平面示意收声室平面示意源室声和收声室的测量记录数据频率(HZ)声压 级测试点I测试点II测试点IIIL （平均）p123123123100P155.4055.6054.9059.6060.9057.7068. 3069.7071.0061.46P218.1018.2018.3023.3022.2024.0035.0034.7033.0025.20125P156.7057.4057.0073.6057.9073.7070.3073.0072.4065.78P219.4020.2021.4029.1030.1028.7041.2042.6041.7
6、030.49160P164.5066.1065.8074.9074.3074.1071.1078.5078.4071.97P233.5033.7033.8034.0033.9035.5047.5046.7047.4038.44200P174.5074.0073.9074.8074.5075.9084.8084.4084.6077.93P239.4039.1039.7042.9043.8043.5050.3051.0050.6044.48250P171.9072.3072.3075.5074.5075.8084.1084.3084.2077.21P235.4035.5032.9043.0036.
7、1038.4045.6045.2045.6039.74315P173.0072.7072.6075.7076.3076.1079.9080.0080.3076.29P227.5027.3027.1033.8033.4034.1045.2038.6038. 2033.91400P175.2075.7074.7076.2075.3076.7080.7079.6079.5077.07P226.4031.9028.0033.9035.1032.6033.9035.2034.6032.40500P172.0072.2072.2075.8077.5077.2078. 3078.6078. 2075.78P
8、228.6029.9032.1032.8033.0034.2033.7033.8033.6032.41630P175.5075.3075.4077.6078.0077.3079.0078.5079.1077.30P230.1031.0030.2036.4035.7036.6035.0032.8034.0033.53800P174.1074.0074.1077.3076.2076.9075.7075.8075.7075.53P229.5029.4030.0038. 3032,434.1035.5034.7032.5033.001000P175.4074.3075.2077.2077.4077.2
9、075.3076.7076.6076.14P229.3029.5029.2035.1033.3031.9034.7033.0032.3032.031250P176.6076.2076.6078. 4082.4078.3078. 3078. 1077.8078. 08P231.8031.9031.7032.9031.9031.7029.8030.1028.2031.111600P179.9079.8079.7082.5083.4082.7079.9080.1079.4080.82P229.3029.2028.9034.1036.2033.3030.1028. 1027.9030.792000P1
10、82.4082.6081.9083.2083.8083.7081.1082.1081.7082.50P231.8031.9031.7037.3037.1037.6033.0032.7033.2034.032500P180.5080.4080.6082.0081.8084.1077.6077.7077.4080.23P225.3034.0033.9039.1039.5039.4033.5034.0033.4034.683150P181.4080.9080.8084.3084.4084.8080.4080.8080.7082.06P236.7036.6036.3043.9043.3043.8035
11、.6037.1037.3038.964000P176.5076.3076.5080.2082.0083.0076.0075.9076.1078.06P236.5030.0029.4034.6034.4034.8029.1029.9028.8031.94Pl(声源室)P2(收声室)实验记录和计算数据频率(HZ)T60(s)A(mJL (平均)p1(dB)L (平均)p2(dB)D(dB)隔声量R(dB)1002.0812.0461.4625.2036.2638. 401251.0623.6365.7830.4935.2935.471600.9825.5671.9738.4433.5235.132
12、000.8130.9377.9344.4833.4634.302500.8130.9377.2139.7437.4734.303150.7832.1276.2933.9142.3834.144000.6439.1477.0732.4044.6733.285000.6041.7575.7832.4143.3733.006300.6041.7577.3033.5343.7733.008000.6240.4075.5333.0042.5333.1410000.6041.7576.1432.0344.1133.0012500.6439.1478. 0831.1146.9733.2816000.6836.8480.8230.7950.0333.5420000.6737.3982.5034.0348. 4733.4825000.6936.3080.2334.6845.5633.6031500.6936.3082.0638.9643.1033.6040000.6936.3078.0631.9446.1133.60T ：混响时间60A ：收声室吸声量 A=0.
