University of Twente Student Theses


3D printed piezo-resistive flow sensors for use on wings

Cui, J.C. (2021) 3D printed piezo-resistive flow sensors for use on wings.

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Abstract:At present, the application of 3D printing technology is becoming more and more extensive. In terms of sensors, 3D printing technology also shows great potential. The field of sensor manufacturing based on thermoplastics is our main research direction. The use of such technology to manufacture a flow sensor for a control system is still novel and worth exploring. This research is mainly devoted to use 3D printing technology to make a flow sensor, and exploring its working characteristic in a close-loop control system. First of all, the first part of this project is the design and printing of the flow sensors. These sensors have piezo-resistive strain gauges which help them to measure the flow. Through mechanical model and dynamic model analysis, several different designs will be tried at the beginning. After printing, the suited model is determined through experiments. Second, this project experimentally characterize the sensors, both quasi-static for deformations and dynamic for the frequency response. In quasi-static experiment, there is a certain non-linearity and hysteresis between the deformation and the change of resistance of the sensor can be observed. And an approximate linear relationship is obtained. In dynamic experiment, the eigenfrequency of the sensor is obtained. Next, in order to further explore the relationship between sensor vibration and surrounding airflow, the sensor is placed in the wind tunnel for testing, so that the actual airflow conditions in the experiment can be better known. Finally, the control system experiment set-up including the drone propeller is designed and built. The control system is close-loop system with PI controller. In this part of the experiment, the working conditions of the sensor in the actual closed-loop control system are studied. The experimental results show that the sensor has under-damping problem, which makes the control system unstable. But a low pass filter with a small cut-off frequency can solve this problem well, so that the control system works normally. Then, more analysis and solution work on this problem are realized in simulation.
Item Type:Essay (Master)
Faculty:EEMCS: Electrical Engineering, Mathematics and Computer Science
Subject:01 general works
Programme:Systems and Control MSc (60359)
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