双侧激励源对热声制冷谐振腔内声场分布的影响

发布时间：2018-06-27 12:11

本文选题：双侧激励 + 谐振腔　；参考：《科学技术与工程》2017年20期

【摘要】：超声磁致伸缩换能器作为热声制冷机的激励元件,其输出声场强度直接影响热声制冷的效率。为提高谐振腔内直观的声压幅值,在单侧磁致伸缩换能器激励的基础上,集合声波相干理论,应用有限元软件ATILA模拟了双侧激励情况下,不同长度谐振腔与激励相位的匹配关系对谐振腔内声压幅值的影响,并与单侧激励谐振腔内声压幅值做比较。研究结果表明:相同激励力情况下,双侧激励(170 mm受同相激励,340 mm受反相激励)谐振腔内产生的平面驻波声场更加稳定、单色性好、声压幅值是单侧激励的1.78(半波长谐振腔)/1.81倍(一个波长谐振腔),均接近于2倍关系。以上研究成果对双侧激励源的相位与谐振腔长度的匹配工作提供了实验依据。
[Abstract]:Ultrasonic magnetostrictive transducer is an exciting element of thermoacoustic refrigerator, and its output sound field intensity directly affects the efficiency of thermoacoustic refrigeration. In order to improve the amplitude of sound pressure in the resonator, based on the excitation of one side magnetostrictive transducer and the theory of acoustic coherence, the finite element software ATILA is used to simulate the bilateral excitation. The influence of the matching relation between different length resonator and excitation phase on the amplitude of sound pressure in resonator is compared with the amplitude of sound pressure in the cavity excited by one side. The results show that under the same excitation force, the plane standing wave sound field in the resonant cavity generated by the bilateral excitation (170 mm excited by the same phase excitation is 340 mm by the inverse phase excitation) is more stable and monochromatic. The amplitude of sound pressure is 1.78 (half wavelength resonator) / 1.81 times (one wavelength resonator) excited by one side, and the relation is close to 2 times. The above results provide experimental basis for the matching of the phase of the two exciting sources with the length of the resonator.
【作者单位】：吉林化工学院机电工程学院;长春理工大学机电工程学院;内蒙古科技大学机械与工程学院;
【基金】：国家自然科学基金(51365033)资助
【分类号】：TB651

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