基于声弛豫频率的可激发气体压强合成算法  

An Algorithm for Synthesizing Excitable Gas Pressure Based on Sound Relaxation Frequency

作　　者：张克声 张世功 张向群[3] 周正达 ZHANG Kesheng;ZHANG Shigong;ZHANG Xiangqun;ZHOU Zhengda(School of Electrical and Information Engineering,Guizhou Institute of Technology,Guiyang,Guizhou 550003,China;School of Science,Guizhou Institute of Technology,Guiyang,Guizhou 550003,China;School of Information Engineering,Xuchang University,Xuchang,Henan 461000,China;Zhibei Information Technology Co.Ltd.,Hangzhou,Zhejiang 310053,China)

机构地区：[1]贵州理工学院电气与信息工程学院,贵州贵阳550003 [2]贵州理工学院理学院,贵州贵阳550003 [3]许昌学院信息工程学院,河南许昌461000 [4]杭州智贝信息科技有限公司,浙江杭州310053

出　　处：《计算物理》2019年第6期699-706,共8页Chinese Journal of Computational Physics

基　　金：国家自然科学基金(61461008,61571201,11764007);国家留学基金(201708525058);贵州省科学技术基金(黔科合J字[2015]2065);贵州理工学院高层次人才引进项目(XJGC20140601)资助

摘　　要：声弛豫频率是声吸收谱峰值点的频率,包含可激发气体成分、环境温度和压强信息.利用声弛豫频率线性正比气体压强的特性,提出一种通过两频点声吸收系数和声速测量值计算声弛豫频率,并通过查表方式合成气体压强的算法.算法的声弛豫频率测量误差具有随声测量值误差线性变换的特性,且当两频点的声吸收测量误差相等时,压强的合成误差为零.对于一定温度下的甲烷及其混合气体,仿真计算证明算法的有效性和声测量误差的稳健性.提供一种简单、稳健性好、可实时连续在线检测可激发气体腔体压强的声学方法.Sound relaxation frequency is frequency of peak point in sound absorption spectrum,which contains information of gas composition,ambient temperature,and pressure in excitable gases.With characteristics of sound relaxation frequency is linearly in proportion to gas pressure,we propose an algorithm for synthesizing gas pressure by acoustic relaxation frequency calculated with absorption coefficients and sound speeds at two frequencies.Measurement error of sound relaxation frequency is proportional to acoustic measurement error.Specially,as sound absorption measurement errors at the two frequencies are equal,error of synthesized pressure is zero.For methane and its mixtures at a certain temperature,simulation results demonstrate effectiveness of the algorithm and its robustness to acoustic measurement errors.Thus,a novel acoustic method,which is simple,robust,and capable of on-line to detect pressure of excitable gas vessel,is provided.

关 键 词：声弛豫频率 气体压强 声学测量 气体压力容器 

分 类 号：O424[理学—声学]