标题:
穿孔管拆卸式消声器及其性能测试技术研究Research of Muffler with Perforated Tube and Its Acoustic Properties Measurement
作者:
吕海峰, 耿彦章, 韩彦南, 刘海霞
关键字:
穿孔管, 消声器, 传递损失, 测试Perforated Tube, Muffler, Transmission Loss (TL), Measurement
期刊名称:
《Mechanical Engineering and Technology》, Vol.5 No.3, 2016-07-20
摘要:
穿孔率是决定穿孔管消声器消声性能的重要因素。提出一种穿孔管可拆卸式消声器结构，可以在腔体体积不变的前提下，将穿孔率不同的穿孔管置入消声器内部，完成对消声器传递损失的控制。采用有限元法对其消声性能进行了仿真，结果表明：穿孔管消声器是扩张腔与亥姆霍茨共振消声器的组合，当穿孔率小时，传递损失主要表现为共振峰特性，抑制噪声的带宽受限；当穿孔率增大时，传递损失曲线呈现明显的拱形特征，穿孔率越大越接近扩张腔消声器特性。设计了用于消声器性能测试的阻抗管测试系统，采用LABVIEW编制了相关的采集、分析程序；测试结果表明在低频部分，可以通过穿孔率对消声器的传递损失进行控制，验证了仿真结果的正确性。
The perforated rate is a key parameter for the acoustical properties of muffler. To control the transmission loss of the muffler without replacing the chamber volume, an assembled muffler structure is supposed by inserting perforated tubes with different rate into the chamber. The transmission loss of the designed muffler is solved numerically with the finite element method (FEM). The simulation indicates that the acoustic properties of muffler with perforated tube share both the expansion chamber muffler and Helmholtz resonators. When the perforated rates close to zero, the TL curves exhibited resonated peak and the frequency band of the attenuated noise is limited. Increasing the perforated rate, the TL curves exhibit as arches. The bigger the perforated rate is, the closer to the expansion muffler. An impedance tube testing system is designed for measuring the mufflers. The data acquisition and analyzing program were compelled with LABVIEW. Experiments performed with the designed muffler show that in the low frequency band, the trans- mission loss can be controlled by the perforated rate of tube, which coincides with the simulation.