摘要
为了实现对具有声学对称特性的消声器传声损失的快速测量,结合其声传递矩阵内部各元素之间的数学关系,提出了一种能够消除消声器下游透射反射波对上游声场耦合的四传声器单载传声损失测量的新方法。以赫姆霍兹共振式消声器为例,基于边界元法对其传声损失进行虚拟测量,虚拟实验结果与理论结果吻合良好,验证了其正确性。该方法通过一次测量即可获得传声损失,具有测量设备简单、速度快、精度高、更易于使用等诸多优点。
In order to measure the transmission loss （TL） of muffler in the acoustic symmetrical characteristic rap- idly, a new method utilizing four microphones and one-load was put forward. The couple of downstream transmis- sion reflection wave to the upstream sound field could be eliminated with the reference of mathematical relationship of acoustic transfer matrix. By using the boundary element method, the TL virtual measurement of a Helmholtz res- onant muffler was performed and the new method was validated： Comparing with the traditional methods, the TL could be acquired by one measurement and the advantages such as the simple measuring equipments, fast speed, high precision, easy operation, etc were achieved.
出处
《机械科学与技术》
CSCD
北大核心
2013年第10期1433-1436,共4页
Mechanical Science and Technology for Aerospace Engineering
关键词
消声器
传声损失
测量
传递矩阵
声学对称特性
muffler
transmission loss
measurement
transfer matrix
acoustic symmetrical characteristic
