摘要
针对质量流量计U型管(以下简称U型管)的频率特性对质量流量计的性能影响较大的问题,以U型管为研究对象,研究施加动态信号后,其导纳和阻抗值变化对其频率特性的影响。首先,搭建了声学实验和压电阻抗实验平台,对U型管进行了声学实验和阻抗实验;其次,对U型管进行了模态分析,并将实验结果与模态分析结果进行了比较,得到了两者一致的结果;最后,搭建了对U型管施加动态信号的阻抗实验平台,对U型管的共振区、低频非共振区、高频非共振区分别进行了实验。研究结果表明:当扫频信号接近所加的共振信号时,会发现明显的共振现象,且共振信号对U型管固有特性的影响大于非共振信号。
Aiming at the problem that the frequency characteristic of mass flowmeter U-tube(hereinafter referred to as U-tube)had great influence on the performance of mass flowmeter,the U-tube was taken as the research object,the influence of admittance and impedance on the frequency characteristics under the dynamic signal was studied.Firstly,the acoustic experiment and piezoelectric impedance experiment platform were set up to carry out the acoustic and impedance experiments on U-tube.Secondly,the modal analysis of U-tube was carried out,the results of experiment were compared with the results of modal analysis,both results are consistent.Finally,the impedance experimental platform under dynamic signal on U-tube was built to test the resonance region,low-frequency non resonance region and high-frequency non resonance region of the U-tube.The research results indicate that when the sweep signal is close to the added resonance signal,the obvious resonance phenomenon was found,the influence of resonance signal on the inherent characteristics of U-tube is greater than that of non-resonant signal.
作者
张军
罗德昌
丁鹏飞
ZHANG Jun;LUO De-chang;DING Peng-fei(School of Mechanical Engineering,Anhui University of Science and Technology,Huainan 232001,China)
出处
《机电工程》
CAS
北大核心
2021年第3期293-299,共7页
Journal of Mechanical & Electrical Engineering
基金
国家自然科学基金资助项目(51175005)
煤炭科学基金资助项目(MTKJ2015327)。
关键词
压电阻抗技术
质量流量计U型管
动态信号
声学实验
阻抗实验
electro-mechanical impedance(EMI)technology
mass flowmeter U-tube
dynamic signal
acoustical experiment
impedance experiment
