多反射式超声波测风模型及算法研究

Multi-reflection ultrasonic wind measuring model and algorithm research

针对当前超声波测风阵列体积大传输路径短,测量精度低的问题,设计了4个收发一体的超声波换能器,按方形排列,探头垂直朝下放置,超声波信号通过在测风区域之间多次反射完成测风,相比于一次反射超声波测风阵列体积缩小20%。基于所建模型,提出自适应测风算法以减弱阴影效应对测风精度的影响。利用SpaceClaim Design Modeler软件建立了测风阵列以及风洞模型,通过Fluent Meshing进行网格划分,使用Fluent软件改变模拟风洞内的风速和风向,验证了所设计的小型超声波测风阵列和自适应权重测风算法在减弱阴影效应提高测量精度的优越性。实验结果表明,自适应权重测风算法相比于传统测风算法的测速精度提高了12.44%,测角精度提高了10.40%。

Aiming at the short transmission path and low measurement accuracy of the small ultrasonic wind measurement array,four ultrasonic transducers integrating transceivers are designed,arranged in a square,with the probes placed vertically downwards,and the ultrasonic signals are reflected multiple times between the wind measurement areas.The wind measurement is completed,and the volume of the one-time reflection ultrasonic wind measurement array is reduced by 20%.Based on the built model,an adaptive wind measurement algorithm is proposed to reduce the influence of shadow effect on wind measurement accuracy.Using the SpaceClaim Design Modeler software,the wind array and wind tunnel model were established,the grid was divided by Fluent Meshing,and the wind speed and direction in the simulated wind tunnel were changed using Fluent software,and the designed small ultrasonic wind array and adaptive weight were verified.The superiority of the wind measurement algorithm in weakening the shadow effect and improving the measurement accuracy.The experimental results show that compared with the traditional wind measurement algorithm,the speed measurement accuracy of the adaptive weight wind measurement algorithm is increased by 12.44%,and the angle measurement accuracy is increased by 10.40%.