仿生毛发气流传感器在流场中的传感特性研究

Study on Sensing Characteristics of Bionic Hair Flow Sensor in Flow Field

模仿昆虫感受器的结构,设计制备了一种仿生毛发气流传感器——表面对称电极含金属芯聚偏氟乙烯(PVDF)纤维(SMPF)传感器。基于流体力学理论和第一类压电方程建立了SMPF的气流传感模型。搭建了实验系统,验证了SMPF对于气流速度的传感能力。实验结果表明,SMPF的输出信号和气流速度的平方成线性关系,验证了理论模型,表明SMPF具有感知气流速度的能力。将纤维呈阵列排布置于风洞流场中,用气流对纤维阵列进行冲击,搭建实验系统,验证了纤维在流场中的传感特性,并进行有限元仿真分析。实验结果表明,在风洞装置中,当有气流流过时,会产生流动边界层,且沿着气流速度方向边界层厚度越来越厚,同一截面上的气流速度差也越来越大。实验结果验证了理论模型,表明SMPF具有感知流场分布的能力。

By imitating the structure of insect receptor,a bionic hair airflow sensor,surface symmetric electrode with metal core polyvinylidene fluoride(PVDF)fiber sensor(SMPF),is designed and fabricated.Based on the theory of hydrodynamics and the first piezoelectric equation,the air flow sensing model of SMPF is established.An experimental system is built to verify the sensing ability of SMPF for airflow velocity.The experimental results show that the output signal of SMPF has a linear relationship with the square of air velocity.The experimental results show that the output signal of SMPF has a linear relationship with the square of the airflow velocity,which validates the theoretical model and shows that SMPF has the ability to sense the airflow velocity.The fibers are arranged in an array row in the wind tunnel flow field,and the fiber array is impacted by the airflow.An experimental system is builtto verify the sensing characteristics of the fibers in the flow field,and a finite element simulation analysis is carried out.The experimental results show that in the wind tunnel device,when there is airflowflowing,a flow boundary layer is generated,the thickness of the boundary layer becomes thicker and thicker along the direction of airflow velocity and the airflow velocity difference on the same cross section is getting larger and larger.The experimental results verify the theoretical model and show that SMPF has the ability to sense the flow field distribution.