SYSTEM PROPERTIES OF FLEXIBLE STRUCTURES WITH SELF-SENSING PIEZOELECTRIC TRANSDUCERS
SYSTEM PROPERTIES OF FLEXIBLE STRUCTURES WITH SELF-SENSING PIEZOELECTRIC TRANSDUCERS
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具有自感应压电传感器的柔性结构的系统特性
DOI：
10.1006/jsvi.1999.2913
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发表时间：
2000
影响因子：
4.7
通讯作者：
A. Tonoli
中科院分区：
文献类型：
--
作者：
S. Carabelli;A. Tonoli
摘要根据系统的性质，如传递函数的极点和零点，研究了自感知读出网络的有源和无源实现。零点的位置取决于与读出电桥的平衡条件和其损耗补偿有关的两个无量纲参数，而不受读出电桥的主动或被动实现的影响。在理想“损失补偿”的情况下，使用图解过程来描述零点的迁移。即使自感测装置保证了感测和执行功能的并置，图解过程也显示了非最小零位相耦合的可能性，用于接近所谓的“电平衡”的平衡条件。然后，从系统的模型出发，研究了截断或残差等模型降阶技术的效果。截断法被证明更适合于确定“电平衡”条件，而残余法给出了更好的系统零点近似值。然后，电平衡和损耗补偿的条件与驱动电输入的自感测桥输出的依赖性最小的条件相关。利用这一特性，可以实际设计出一种自适应读出电桥，它可以自动达到平衡条件和损耗补偿，或识别压电换能器的电气参数。对安装了自感知压电换能器的梁和板结构进行了实验测试，验证了分析模型的有效性。
Abstract Active and passive implementations of self-sensing readout networks are studied in terms of system properties such as the poles and the zeros of their transfer functions. The location of the zeros is shown to be dependent on two non-dimensional parameters related to the balancing condition of the readout bridge and to the compensation of its losses, while it is not affected by the active or passive implementation of the readout bridge. In the case of ideal “loss compensation” a graphical procedure is employed to describe the migration of the zeros. Even if the self-sensing arrangement guarantees the colocation of the sensing and actuating functions, the graphical procedure shows the possibility of non-minimum phase zero coupls for balancing conditions close to the so-called “electrical balancing”. The effects of model reduction techniques such as truncation or residualization is then studied, starting from a model of the system in terms of modal coordinates. Truncation is shown to be better suited to determine the “electrical balancing” condition while residualization gives a better approximation of the system zeros. The conditions of electrical balancing and loss compensation are then related to a condition of minimum dependance of the self-sensing bridge output from the driving electrical input. This property can be practically exploited to devise an adaptive readout bridge which can automatically reach the balancing conditions and the loss compensation or to identify the electrical parameters of the piezoelectric transducer. Experimental tests performed on a beam and a plate structures provided with self-sensing piezoelectric transducers are used to validate the analytical models.