一些有声响的机电产品,它的噪声需要在与环境噪声隔离的情况下进行测试,如空调器、电机、冷藏冰箱等.还有一些产品要在生产流水线上一边进行噪声测试,一边进行调试,直到产品组件的噪声达到合格量值,才可以流向下一工位安装或进行包装.如有冷风电扇的电子仪器;再如音箱类产品,需要测试声响的幅频特性.以上这些均需要在消声室内进行.通常建造消声室占用体积大,造价贵.我们在实践中充分利用新型复合阻尼吸声材料,把消声室的体积缩小到1～2m～3,称之为消声箱,对不少产品的实践试用是成功的,且造价低,占用体积小,因此在此向读者介绍.图1为1m～3的一种消声箱,内壁六个面均用减震、吸声、复合材料(见图2)做成小的三角楔块交叉粘贴而成.吸声材料为多孔性材料,它的构造特征是具有许多微小的间隙和连续的孔洞,而且 Some sound mechanical and electrical products, the noise needs to be tested in isolation from the ambient noise, such as air conditioners, motors, refrigerators, etc. There are some products to be carried out in the production line noise test, while debugging, Until the noise of the product components reaches the qualified value, it can flow to the next station for installation or packaging.If the electronics of the cold fan, or the speaker products, you need to test the amplitude-frequency characteristics of the sound. Acoustic chamber usually built anechoic chamber occupy a large volume, high cost.We take full advantage of the new composite damping sound absorption material in practice, the anechoic chamber volume reduced to 1 ~ 2m ~ 3, called the anechoic chamber, The practical trial of many products is successful, and the low cost, occupy small size, so in this introduction to the reader.Figure 1 is a 1m ~ 3 anechoic chamber, the inner wall of the six sides are used shock absorption, sound absorption , The composite material (see Figure 2) made of small triangular wedge cross-paste made of sound-absorbing material is a porous material, which is characterized by the structure with many small gaps and continuous holes, and