摘要
压电式超声风速传感器相对于传统的机械测风仪器具有更高的精度和可靠性,但实际使用过程中,一些地区户外气候环境复杂,当遭遇恶劣天气时会对超声换能器发出的辐射声场造成影响。利用COMSOL有限元分析软件针对压电式换能器在已知半径的球型区域内声场分布进行模拟分析,通过改变换能器与空气耦合的边界条件,模拟了暴雨和沙暴两种恶劣天气情况,对比了两种情况下换能器辐射声场的声压和声压级。结果表明,强降雨天气条件对超声波的辐射声场影响较小,而风沙天气下,随着沙尘浓度升高,超声波声能衰减越明显。仿真结果为超声波风速传感器在恶劣气候下测量的技术改进提供了参考和依据。
Piezoelectric ultrasonic wind-speed sensors have higher accuracy and reliability than traditional mechanical wind instruments.However,in practical application,the outdoor climatic environment in some areas is complicated,and it will affect the radiated sound field emitted by the ultrasonic transducer in severe weather.The COMSOL finite element analysis software is used to simulate the sound field distribution of the piezoelectric transducer in the radius-spherical region.The boundary conditions of the transducer and air coupling are used to simulate the heavy rains and sandstorms in severe weather conditions,and the sound pressure and sound pressure level of the transducer sound field are compared in several cases.The results show that heavy rains have little effect on the ultrasonic radiation sound field.With the increase of dust concentration,the attenuation of ultrasonic signal becomes more obvious.The simulation results provide a reference and basis for the technical improvement of ultrasonic wind speed sensors in severe weather.
作者
翟光贤
禹胜林
王冰梅
杨恒祥
ZHAI Guangxian;YU Shenglin;WANG Bingmei;YANG Hengxiang(School of Electronic and Information Engineering,Nanjing University of Information Science and Technology,Nanjing 210044;Jiangsu Meteorological and Technical Equipment Center,Nanjing 210009)
出处
《气象科技》
2021年第3期328-335,共8页
Meteorological Science and Technology
关键词
超声换能器
有限元法
边界条件
声场分布
ultrasonic transducer
finite element method
boundary condition
sound field distribution
