摘要
报告了一种直接测量回热器声阻抗特性的传递函数法。将实验管内的声波分解成入射波和反射波，通过两个不同位置上的传感器所测得的压力波之比，以及两个位置上反射波与入射波声压之间的简单传递函数关系，确定实验段入出口处的复反射因子，再由复反射因子确定实验段入出口处的压力波动和流量波动，从而得到实验段的阻抗特性。同时报告了理论分析和实验测量得到的简单管道阻抗特性的对比。结果表明，这种直接测量方法是可靠的。
A new rnethod-a transfer function method is reported to meas-ure directly the acoustical impedance characteristics. In this method theacoustical ware in the experirnental tube is mathematically decomposed intoits incident and reflected components。With the impulse response functionbetween the two acoustical pressures rneasured by the transducers at twodifferent locations and using a simple transfer function relation betweentwo acoustical pressure components,the ware decomposition leads to thedetermination of the complex reflection coefficients from which the fluxfluctuations at the input and the output of the experimental section can bedetermined and finally the acoustical impedances are obtained.Also prese-nted are the results of the experiment in a simple tube which show thatthis method is credible with regard to the theoretical results。
出处
《低温工程》
CAS
CSCD
1994年第2期12-20,共9页
Cryogenics
关键词
回热器
声阻抗
测量方法
制冷机
regenerator
acoustic impedance
measuring method
