Resonant behavior study of PZT sensor partially immersed in liquid using PSO method: modeling and experiment
Resonant behavior study of PZT sensor partially immersed in liquid using PSO method: modeling and experiment
复制标题
使用 PSO 方法研究部分浸没在液体中的 PZT 传感器的谐振行为：建模和实验
DOI：
10.1007/s10470-015-0504-4
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
M. Shamshirsaz
中科院分区：
文献类型：
--
作者：
M. Maroufi;M. Shamshirsaz
谐振式压电激励的毫米级悬臂梁在液位和密度传感等方面的应用引起了许多研究者的兴趣。在这些应用中，PEMC部分浸入液体中；需要一个适当的分析模型来预测这些设备的动态行为。在这项工作中，设计并制造了一种可用作液位传感平台的PEMC。建立了一个分析模型，并将其应用于评估该装置在不同尖端浸入深度下的行为。为了验证所提出的模型，对两种不同的谐振模式下，针尖在水中的浸没深度在5~15 mm的情况下，比较了理论和实验结果。为了验证理论模型与实验结果之间的偏差，在理论模型中引入了不确定参数和水动力修正因子。为了利用实验结果确定这些参数，采用了粒子群优化方法。应用该方法，理论计算结果与实验数据的偏差明显减小。结果表明，不确定参数对不同浸没深度的PEMC的谐振频率漂移影响不大，而与水动力有关的修正系数对其影响较大。结果表明，为了提高部分浸入液体的PEMC的频域建模精度，对于不同的浸入深度，需要通过引入流体动力修正因子来适当地估计液体力。
Resonant piezoelectric-excited millimeter-sized cantilevers (PEMCs) have attracted many researchers’ interests in the applications such as liquid level and density sensing. As in these applications, the PEMC’s are partially immersed in liquid; an appropriate analytical model is needed to predict the dynamic behavior of these devices. In this work, a PEMC is designed and fabricated to be used as a liquid level sensing platform. An analytical model is developed and applied to evaluate the behavior of this device with respect to different tip immersion depths. To validate the proposed model, the theoretical and experimental results are compared for the tip immersion depths varying from 5 to 15 mm in water for two different resonant modes. To justify the deviations observed between the theoretical model and the experimental results, uncertain parameters and a correction factor for hydrodynamic force are introduced in theoretical model. To determine these parameters using experimental results, particles swarm optimization method is utilized. Applying this method, the deviation of theoretical results from experimental data is being significantly reduced. The results show that the uncertain parameters have negligible effect on the resonant frequency shift of the PEMC in different immersion depths, whereas the correction factor related to the hydrodynamic force affects it drastically. It is concluded that to improve the accuracy of the frequency domain modeling of PEMC partially immersed in liquid, for different immersion depths, an appropriate estimation of liquid force is required by insertion of hydrodynamic correction factor.