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FINITE ELEMENT ANALYSIS OF FACTORS INFLUENCING DISPLACEMENT MEASUREMENT USING PLANAR INDUCTIVE SENSORS

Yu, Xueyang
http://orcid.org/0000-0002-3098-3568
http://rave.ohiolink.edu/etdc/view?acc_num=akron1586791378508492

Abstract Details

2020, Master of Science in Engineering, University of Akron, Mechanical Engineering.
ABSTRACT Non-contacting displacement/distance sensors are widely used for position measurement to ensure the performance of the system, especially when the target surface is hard for sensor setup. Inductive planar displacement sensors are widely used to measure the position of the object in terms of measuring the equivalent inductance of the sensing planar coil. Compared to other types of non-contacting displacement sensors, including optical, microwave and capacitive sensors, inductive displacement sensors are less sensitive to environmental factors, easy installing in narrow space, robust, and low cost. Nevertheless, the output of the inductive planar coil (i.e., the equivalent inductance) can be affected by the material and the shape of the target, high-temperature and the tilt angle of the object. I used FEA method to simulate the eddy current on the targets and the equivalent inductance of the sensing coil with different materials, shapes, environment temperatures and target tilt angles. First, the eddy current distribution on various targets of different materials and shapes was analyzed to prove the hypothesis that the eddy current distribution on the target can be modeled as a ring-shaped virtual coil. Thus the coil-to-target interaction model can be simplified as a coil-to-coil interaction model, which was the basis for a calibration simplification method for targets made of different materials, developed by our research group. The simplified calibration process based on the validated coil-to- coil model was confirmed using FEA results. Second, high-temperature effects, including the thermal expansion and material properties change, were studied to figure out the high-temperature influence on the equivalent inductance change. It was found that material conductivity change is the dominating factor on the equivalent inductance of the sensing coil under high temperatures. Therefore the high temperature can be simplified as changing target material, so that the simplified calibration method to targets made of different materials can be used for targets at varying temperatures. Finally, the target tilting effect on the equivalent coil inductance was studied; a method was proposed, which can be used for both tilt angle and displacement measurement using a single planar coil. In summary, in my thesis, I proved a hypothesis that the eddy current distribution on the target can be modeled as a ring-shaped virtual coil regardless of the target shapes and materials. With this hypothesis, I further confirmed a calibration simplification method developed by our research group. I also found that at varying temperatures, the target material property change is the dominant factor such that the calibration method can still be used. Such findings can be used in blade tip measurement for gas turbine machines. I also simulated the tilting effect, from which a method was proposed to measure both the tilt angle and the distance from the target using a single planar coil. The results can benefit the target displacement measurement when the position of the target is unknown and the deflection measurement (i.e., micromirror devices, blade tip deflection while rotating).
Jiang Zhe (Advisor)
Xiaosheng Gao (Committee Member)
Kwek Tze Tan (Committee Member)
80 p.
Mechanical Engineering
Planar inductive sensor, high-temperature effect, tilt angle effect, material and shape effect

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Citations

  • Yu, X. (2020). FINITE ELEMENT ANALYSIS OF FACTORS INFLUENCING DISPLACEMENT MEASUREMENT USING PLANAR INDUCTIVE SENSORS [Master's thesis, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron1586791378508492

    APA Style (7th edition)

  • Yu, Xueyang. FINITE ELEMENT ANALYSIS OF FACTORS INFLUENCING DISPLACEMENT MEASUREMENT USING PLANAR INDUCTIVE SENSORS. 2020. University of Akron, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron1586791378508492.

    MLA Style (8th edition)

  • Yu, Xueyang. "FINITE ELEMENT ANALYSIS OF FACTORS INFLUENCING DISPLACEMENT MEASUREMENT USING PLANAR INDUCTIVE SENSORS." Master's thesis, University of Akron, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=akron1586791378508492

    Chicago Manual of Style (17th edition)

akron1586791378508492
459
© 2020, some rights reserved.Creative Commons License FINITE ELEMENT ANALYSIS OF FACTORS INFLUENCING DISPLACEMENT MEASUREMENT USING PLANAR INDUCTIVE SENSORS by Xueyang Yu is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License. Based on a work at etd.ohiolink.edu.
This open access ETD is published by University of Akron and OhioLINK.