环境温度变化压电智能骨料信号稳定性试验研究
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摘要
研究了压电智能骨料在环境温度变化时的信号稳定性问题,并明确其变化规律及分析原因,为基于压电智能骨料的混凝土结构健康监测奠定基础。将预先埋设压电智能骨料的小尺寸素混凝土梁置入恒温试验箱中,改变箱内温度并记录不同温度下的压电智能骨料信号能量值,利用试验数据拟合出信号能量值与温度之间的关系。试验结果表明,压电智能骨料信号幅值受温度影响变化明显且表现出明显的非线性变化规律及符合压电材料机电耦合系数随温度变化的规律,其原因是由于压电陶瓷材料本身弹性常数随温度变化,并在宏观上体现为机电耦合系数的变化。
The signal stability of piezoelectric smart aggregates(PSAs)under environmental temperature changes is investigated to clarify the rules and its variation law is analyzed in this work.The research will lay a solid foundation for PSA-based structural health monitoring(SHM).A small scale plain concrete beam pre-embedded with PSAs is placed and tested in a thermostatic chamber and the PSA signal energy values for changing temperatures are recorded,and the relationship between signal energy values and temperatures is fitted by the test data.The experimental results show that the PSA signals change obviously and behave significantly nonlinear property which complies with the electro-mechanical coupling coefficient of piezoelectric material.This is because the temperature change leads to the variation of elastic constants,reflecting the variation of electromechanical coupling coefficient on a macroscale.
The signal stability of piezoelectric smart aggregates(PSAs)under environmental temperature changes is investigated to clarify the rules and its variation law is analyzed in this work.The research will lay a solid foundation for PSA-based structural health monitoring(SHM).A small scale plain concrete beam pre-embedded with PSAs is placed and tested in a thermostatic chamber and the PSA signal energy values for changing temperatures are recorded,and the relationship between signal energy values and temperatures is fitted by the test data.The experimental results show that the PSA signals change obviously and behave significantly nonlinear property which complies with the electro-mechanical coupling coefficient of piezoelectric material.This is because the temperature change leads to the variation of elastic constants,reflecting the variation of electromechanical coupling coefficient on a macroscale.
引文
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[2]孙威.利用压电陶瓷的智能混凝土结构健康监测技术[D].大连:大连理工大学,2009.
[3]蒙彦宇,阎石.压电混凝土梁主动健康监测试验[J].沈阳建筑大学学报:自然科学版,2011,27(2):253-259.MENG Yanyu,YAN Shi.Experimental research on active health monitoring of PZT concrete beam[J].Journal of Shenyang Jianzhu University:Natural Science,2011,27(2):253-259.
[4]田卉,文玉梅.埋入混凝土结构中的PZT压电陶瓷温度特性研究[J].传感技术学报,2007,20(9):1977-1982.TIAN Hui,WEN Yumei.Temperature characteristics of piezoelectric ceramic embedded in concrete structure[J].Chinese Journal of Sensors and Actuators,2007,20(9):1977-1982.
[5]张福学,王丽坤.现代压电学[M].北京:科学出版社,2001:99-100.
[6]SABATA R G,MUKHERJEE B K.Temperature dependence of the complete material coefficients matrix of soft and hard doped piezoelectric lead zirconate titanate ceramics[J].Journal of Applied Physics,2007(064111):1-7.
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