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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（。二、-、）。因此，对隔墙空气声隔绝量的测试 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 + 10lg Aplp 2一共测试100-3150Hz的16个1/3倍频带的隔声量
2、，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Rw。0.161V门:混响时间，实验室内混响时间测定中测D=LP1-LP2A :受声室吸声量 A =60得）Lp1 :声源室的平均声压级lp2:受声室的平均声压级D：声源室与受声室平均声压级差四、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、按要求布置好声源和测点位置，关闭好门窗，
3、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Lp1和Lp2，每一个测点的每一频率直接读取其声压级平均值 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，在测量的频率范围内具有连续的频率。2、声源应具有足够
4、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。8、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、实验数据及处理试件面积 S： (2+1.5)X5.5=19.25m2容积 V： 4.1X5.5X6.9=155.595m2，发声室平面示意收尸室平面示意源室声和收
5、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mLp （平均）123123123100P155.4055.6054.9059.6060.9057.7068.3069.7071.0061.46P218.1018.2018.3023.3022.2024.0035.0034.7033.0025.20125P156.7057.4057.0073.6057.9073.7070.3073.0072.4065.78P219.4020.2021.4029.1030.1028.7041.2042.6041.7030.49160P164.5066.1065.8074.9074.3074.1071.
6、1078.5078.4071.97P233.5033.7033.8034.0033.9035.5047.5046.7047.4038.44200P174.5074.0073.9074.8074.5075.9084.8084.4084.6077.93P239.4039.1039.7042.9043.8043.5050.3051.0050.6044.48250P171.9072.3072.3075.5074.5075.8084.1084.3084.2077.21P235.4035.5032.9043.0036.1038.4045.6045.2045.6039.74315P173.0072.7072
7、.6075.7076.3076.1079.9080.0080.3076.29P227.5027.3027.1033.8033.4034.1045.2038.6038.2033.91400P175.2075.7074.7076.2075.3076.7080.7079.6079.5077.07P226.4031.9028.0033.9035.1032.6033.9035.2034.6032.40500P172.0072.2072.2075.8077.5077.2078.3078.6078.2075.78P228.6029.9032.1032.8033.0034.2033.7033.8033.603
8、2.41630P175.5075.3075.4077.6078.0077.3079.0078.5079.1077.30P230.1031.0030.2036.4035.7036.6035.0032.8034.0033.53800P174.1074.0074.1077.3076.2076.9075.7075.8075.7075.53P229.5029.4030.0038.3032,434.1035.5034.7032.5033.001000P175.4074.3075.2077.2077.4077.2075.3076.7076.6076.14P229.3029.5029.2035.1033.30
9、31.9034.7033.0032.3032.031250P176.6076.2076.6078.4082.4078.3078.3078.1077.8078.08P231.8031.9031.7032.9031.9031.7029.8030.1028.2031.111600P179.9079.8079.7082.5083.4082.7079.9080.1079.4080.82P229.3029.2028.9034.1036.2033.3030.1028.1027.9030.792000P182.4082.6081.9083.2083.8083.7081.1082.1081.7082.50P23
10、1.8031.9031.7037.3037.1037.6033.0032.7033.2034.032500P180.5080.4080.6082.0081.8084.1077.6077.7077.4080.23P225.3034.0033.9039.1039.5039.4033.5034.0033.4034.683150P181.4080.9080.8084.3084.4084.8080.4080.8080.7082.06P236.7036.6036.3043.9043.3043.8035.6037.1037.3038.964000P176.5076.3076.5080.2082.0083.0
11、076.0075.9076.1078.06P236.5030.0029.4034.6034.4034.8029.1029.9028.8031.94P1(声源室)P2(收声室)实验记录和计算数据频率(HZ)T60(s)A(E)Lp1 (平均) 函(dB)Lp2 (平均)P2 (dB)D(dB)隔尸里 R(dB)1002.0812.0461.4625.2036.2638.401251.0623.6365.7830.4935.2935.471600.9825.5671.9738.4433.5235.132000.8130.9377.9344.4833.4634.302500.8130.9377.21
12、39.7437.4734.303150.7832.1276.2933.9142.3834.144000.6439.1477.0732.4044.6733.285000.6041.7575.7832.4143.3733.006300.6041.7577.3033.5343.7733.008000.6240.4075.5333.0042.5333.1410000.6041.7576.1432.0344.1133.0012500.6439.1478.0831.1146.9733.2816000.6836.8480.8230.7950.0333.5420000.6737.3982.5034.0348.4733.4825000.6936.3080.2334.6845.5633.6031500.6936.3082.0638.9643.1033.6040000.6936.3078.0631.9446.1133.60T60:混响时间A :收声室吸声量 A=0.161V/T60、：声源室的平均声压级、：收声室的平均声压级D :声源室与收声室平均声压级差D=Lp1-Lp2R
