消声器内插管结构参数的数值模拟及声学性能分析

Numerical Simulation and Acoustic Performance Analysis of Structural Parameters of Muffler Inner Cannulas

内插管长度是影响压缩机排气消声器声学性能的一项重要结构参数。以压缩机实际工作频段为前提条件,以噪声值为优化目标对内插管长度进行优化,采用数值模拟方法研究了该频段范围内内插管长度与其传递损失的关系,并利用正弦函数法构建两者之间的拟合曲线,获得传递损失随内插管长度的变化规律,并选取数据点验证该拟合曲线的准确性;顺而依据传递损失拟合曲线对消声器内插管长度进行优化,并采用数值模拟方法分析优化内插管长度后的消声器的传递损失,得出优化内插管长度后的消声器相比原消声器的传递损失提高13.2 dB的结论,最后通过实验验证数值模拟方法的准确性和优化内插管长度的可行性。

The length of the inner cannula is an important structural parameter that affects the acoustic performance of the compressor exhaust mufflers.With actual working frequency band of the compressor as the precondition and the noise values as the optimization goal,the intubation length of the muffler was optimized.The relation of the intubation length with its transmission loss in the working frequency range was studied using numerical simulation method,and this relation was fitted by a sinusoidal curve.Then,the variation law of the transmission loss of the intubation with the intubation length was obtained.According to the fitting curve,the intubation length was optimized.And the transmission loss of the muffler with the optimal intubation length was calculated by means of numerical simulation.It is concluded that the transmission loss of the muffler with the optimal intubation length is increased by 13.2 dB in comparison with the original muffler.Finally,the accuracy of the simulation method and the feasibility of the intubation length optimization were verified by experimental test.