摘要
声波导管的设计是影响声学信号信噪比的关键因素,导管内径越大、长度越短,越利于声波传输,但同时对声学共鸣腔产生更大的扰动。提出了采用变径声波导管降低声波的能量损耗和扰动方法,建立了变径声波导管的衰减和扰动模型,对比分析声学信号在不同尺寸声波导管内的能量衰减和导管对圆柱轴向非缔合声学共振频率和半宽的扰动,获得了优化的导管尺寸,在声波传输能量损失较小的情况下对内长为80 mm圆柱腔体首个轴向非缔合声学共振频率产生的相对扰动在3×10-5以内,该声波导管的优化设计可为高温气体声学温度计的深入研究提供理论支持。
The design of the acoustic waveguides is key to the signal-to-noise ratio of the acoustic resonances. Acoustic waveguides with larger inner diameter and shorter length are good for the signal transfer,but it will cause larger perturbation to the acoustic resonator. A new kind of acoustic waveguides with variable dimensions to reduce energy loss along the waveguides as well as the perturbation from the ducts was proposed,and a model of the energy loss and the perturbation for the new design was developde,compared the sound attenuation and the perturbation to the acoustic resonance frequencies and half-widths for different dimensions of the waveguides. The optimized design of the acoustic waveguides can reduce the perturbation to the acoustic resonance frequency to below 3 × 10-5for the first longitudinal non-degenerate mode of a cylindrical resonator with an inner length of 80 mm. This research contributes to the further study of high-temperature acoustic gas thermometry.
作者
陈厚桦
冯晓娟
林鸿
张金涛
任成
王克俭
CHEN Hou-hua;FENG Xiao-juan;LIN Hong;ZHANG Jin-tao;REN Cheng;WANG Ke-jian(Electrical and Mechanical College,Beijing University of Chemical Technology,Beijing 100029,China;Division of Thermophysics and Process Meas,National Institute of Metrology,Beijing 100029,China;Institute of Nuclear and New Energy Technology,Tsinghua University,Beijing 100084,China)
出处
《计量学报》
CSCD
北大核心
2019年第1期1-7,共7页
Acta Metrologica Sinica
基金
国家重点研发计划(2016YFF0200101)
国家自然科学基金(51476153
51506114)
关键词
计量学
气体声学温度计
声波导管
热力学温度
圆柱声学共鸣法
metrology
acoustic gas thermometry
acoustic waveguides
thermodynamic temperature
cylindrical acoustic resonator
