RESEARCH ON THE DECOUPLING METHOD OF STRUCTURE STRAIN MEASUREMENT BASED ON PVDF SENSORS ARRAY
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- 英文论文题名：RESEARCH ON THE DECOUPLING METHOD OF STRUCTURE STRAIN MEASUREMENT BASED ON PVDF SENSORS ARRAY
- 论文作者：Ling-jie LI ; Dong LI ; Wen-hao WANG ; Jing HAN
- 英文论文作者：Ling-jie LI ; Dong LI ; Wen-hao WANG ; Jing HAN ; College of Mechatronic Engineering ; North University of China
- 年：2016
- 作者机构：College of Mechatronic Engineering, North University of China;
- 英文论文关键词：Piezoelectric Sensors ; Strain decoupling ; Array ; ABAQUS
- 会议召开时间：2016-10-21
- 会议录名称：2016年全国压电和声波理论及器件应用研讨会论文摘要集
- 英文会议录名称：Abstract Book of 2016 Symposium on Piezoelectricity, Acoustic Waves and Device Applications
- 语种：英文
- 分类号：TP212
- 学会代码：AGLU
- 会议名称：2016年全国压电和声波理论及器件应用研讨会
- 会议地点：中国陕西西安
- 主办单位：中国力学学会、中国声学学会、IEEE UFFC分会
- 学会名称：中国力学学会
- 页数：2
- 文件大小：10k
- 原文格式：D
- 会议级别：全国
摘要
Background, Motivation and Objective There are many methods to test the structural strain at present. However, the only total strain component can be obtained by most of these methods. In some practical accasion, we are interested in the triaxial strain component, which is specific refers to the bending strain, axial strain and shearing strain. But there were only few studies of relevant methods to measure these required strains separately. Thus, a test method based on PVDF sensors array was proposed, which was used for measuring the bend strain of cantilever beam structure. Statement of Contribution/Methods To eliminate the sensitivity of the PVDF sensors to axial and shear strains, four sensors constituted an array and were used for measuring the bending strain. The symmetry between sensors 1 and 3, 2 and 4, 1 and 4, 2 and 3 was satisfied. Sensor 1 and sensor 3 were attached to the structure by a commercial adhesive tape; Sensor 2 and sensor 4 were also attached to the opposite side of the host structure. The mathematical expression between the voltage output of the PVDF sensor array and the bending strain of the subject structure surface was obtained. The signals of PVDF sensors and resistance strain gauge were collected and analyzed by using LABVIEW software. Results In order to verify the PVDF sensor array can be used to measure structure bending strain. Impact tests and FEM analysis are carried out. In the impact test, comparison between the PVDF and the traditional resistance strain gauge signals verifies the ability of PVDF sensors array are able to measure a bending strain component of interest and demonstrates its advantage in terms of SNR. On the other hand, comparison between the frequency values obtained by FEM model analysis and those measured by PVDF sensors array indicates the excellent capability of the attached PVDF sensor array in capturing the fundamental natural frequencies of the cantilever beam. Discussion and Conclusions The effects of sensor size and position on the output voltage of PVDF sensors array were investigated in parametric studies. The results show that a larger sensor tends to generate higher output voltage than a smaller one at the same location. However, the effect of sensor location seems to be more significant than sensor size. When PVDF sensors 1 and 4 are close to sensor 3 and sensor 2 respectively, the bending strain test method have maximized the temperature compensation performance. However, the sensitivity of the rosette is low because all four sensors are close to the neutral plane. In contrast, When PVDF sensors 1 and 4 are far apart from sensor 3 and sensor 2 maximizes the overall sensitivity to bending strain.
Background, Motivation and Objective There are many methods to test the structural strain at present. However, the only total strain component can be obtained by most of these methods. In some practical accasion, we are interested in the triaxial strain component, which is specific refers to the bending strain, axial strain and shearing strain. But there were only few studies of relevant methods to measure these required strains separately. Thus, a test method based on PVDF sensors array was proposed, which was used for measuring the bend strain of cantilever beam structure. Statement of Contribution/Methods To eliminate the sensitivity of the PVDF sensors to axial and shear strains, four sensors constituted an array and were used for measuring the bending strain. The symmetry between sensors 1 and 3, 2 and 4, 1 and 4, 2 and 3 was satisfied. Sensor 1 and sensor 3 were attached to the structure by a commercial adhesive tape; Sensor 2 and sensor 4 were also attached to the opposite side of the host structure. The mathematical expression between the voltage output of the PVDF sensor array and the bending strain of the subject structure surface was obtained. The signals of PVDF sensors and resistance strain gauge were collected and analyzed by using LABVIEW software. Results In order to verify the PVDF sensor array can be used to measure structure bending strain. Impact tests and FEM analysis are carried out. In the impact test, comparison between the PVDF and the traditional resistance strain gauge signals verifies the ability of PVDF sensors array are able to measure a bending strain component of interest and demonstrates its advantage in terms of SNR. On the other hand, comparison between the frequency values obtained by FEM model analysis and those measured by PVDF sensors array indicates the excellent capability of the attached PVDF sensor array in capturing the fundamental natural frequencies of the cantilever beam. Discussion and Conclusions The effects of sensor size and position on the output voltage of PVDF sensors array were investigated in parametric studies. The results show that a larger sensor tends to generate higher output voltage than a smaller one at the same location. However, the effect of sensor location seems to be more significant than sensor size. When PVDF sensors 1 and 4 are close to sensor 3 and sensor 2 respectively, the bending strain test method have maximized the temperature compensation performance. However, the sensitivity of the rosette is low because all four sensors are close to the neutral plane. In contrast, When PVDF sensors 1 and 4 are far apart from sensor 3 and sensor 2 maximizes the overall sensitivity to bending strain.
Background, Motivation and Objective There are many methods to test the structural strain at present. However, the only total strain component can be obtained by most of these methods. In some practical accasion, we are interested in the triaxial strain component, which is specific refers to the bending strain, axial strain and shearing strain. But there were only few studies of relevant methods to measure these required strains separately. Thus, a test method based on PVDF sensors array was proposed, which was used for measuring the bend strain of cantilever beam structure. Statement of Contribution/Methods To eliminate the sensitivity of the PVDF sensors to axial and shear strains, four sensors constituted an array and were used for measuring the bending strain. The symmetry between sensors 1 and 3, 2 and 4, 1 and 4, 2 and 3 was satisfied. Sensor 1 and sensor 3 were attached to the structure by a commercial adhesive tape; Sensor 2 and sensor 4 were also attached to the opposite side of the host structure. The mathematical expression between the voltage output of the PVDF sensor array and the bending strain of the subject structure surface was obtained. The signals of PVDF sensors and resistance strain gauge were collected and analyzed by using LABVIEW software. Results In order to verify the PVDF sensor array can be used to measure structure bending strain. Impact tests and FEM analysis are carried out. In the impact test, comparison between the PVDF and the traditional resistance strain gauge signals verifies the ability of PVDF sensors array are able to measure a bending strain component of interest and demonstrates its advantage in terms of SNR. On the other hand, comparison between the frequency values obtained by FEM model analysis and those measured by PVDF sensors array indicates the excellent capability of the attached PVDF sensor array in capturing the fundamental natural frequencies of the cantilever beam. Discussion and Conclusions The effects of sensor size and position on the output voltage of PVDF sensors array were investigated in parametric studies. The results show that a larger sensor tends to generate higher output voltage than a smaller one at the same location. However, the effect of sensor location seems to be more significant than sensor size. When PVDF sensors 1 and 4 are close to sensor 3 and sensor 2 respectively, the bending strain test method have maximized the temperature compensation performance. However, the sensitivity of the rosette is low because all four sensors are close to the neutral plane. In contrast, When PVDF sensors 1 and 4 are far apart from sensor 3 and sensor 2 maximizes the overall sensitivity to bending strain.
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