Vibration characterisation of cymbal transducers for power ultrasonic applications
Vibration characterisation of cymbal transducers for power ultrasonic applications
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DOI：
10.1088/1742-6596/382/1/012063
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发表时间：
2012-08
期刊：
影响因子：
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通讯作者：
F. Bejarano;A. Feeney;M. Lucas
中科院分区：
文献类型：
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作者：
F. Bejarano;A. Feeney;M. Lucas
V类钹形弯张换能器由夹在两个钹形壳体端盖之间的压电陶瓷盘或环组成。这些端盖充当机械变压器，将压电陶瓷的高阻抗、低径向位移转换为端盖的低阻抗、大轴向运动。cymbal传感器是在20世纪90年代早期由宾夕法尼亚州立大学开发的，并且是自20世纪80年代以来一直使用的Moonie传感器的改进。尽管钹换能器已被用于许多领域，作为传感器和致动器，但由于其物理限制，其使用主要是在低功率强度下。只是最近才研究了它对高振幅和高功率应用的适用性，因此在这一研究领域的实施仍然没有发展。本文采用实验模态分析（EMA），振动响应测量和电阻抗测量，以验证两种变化的钹换能器的设计，都旨在纳入超声切割设备。传感器的制造使用商业Eccobond 45LV环氧树脂粘合剂作为粘合剂。第一个钹式换能器是经典的设计，其中压电陶瓷盘直接粘合到端盖。第二钹换能器包括结合到压电陶瓷盘的外边缘的金属环。包括该金属环的原因是为了改善与端盖的机械耦合。因此，这将使该设计特别适合于功率超声应用，降低在较高超声振幅下剥离的可能性。实验结果表明，第二钹设计是一个显着的改进，更经典的设计，允许换能器工作在更高的电压和更高的振幅，表现出一个线性响应在一个实际的功率超声器件驱动电压范围。结果还表明，该装置可以使用有限元建模进行精确调谐，并且钹呈现出由有限元模型预测的模态响应。
A Class V cymbal flextensional transducer is composed of a piezoceramic disc or ring sandwiched between two cymbal-shaped shell end-caps. These end-caps act as mechanical transformers to convert high impedance, low radial displacement of the piezoceramic into low impedance, large axial motion of the end-cap. The cymbal transducer was developed in the early 1990's at Penn State University, and is an improvement of the moonie transducer which has been in use since the 1980's. Despite the fact that cymbal transducers have been used in many fields, both as sensors and actuators, due to its physical limitations its use has been mainly at low power intensities. It is only very recently that its suitability for high amplitude and high power applications has been studied, and consequently implementation in this area of research remains undeveloped. This paper employs experimental modal analysis (EMA), vibration response measurements and electrical impedance measurements to characterise two variations of the cymbal transducer design, both aimed at incorporation in ultrasonic cutting devices. The transducers are fabricated using the commercial Eccobond 45LV epoxy adhesive as the bonding agent. The first cymbal transducer is of the classic design where the piezoceramic disc is bonded directly to the end-caps. The second cymbal transducer includes a metal ring bonded to the outer edge of the piezoceramic disc. The reason for the inclusion of this metal ring is to improve the mechanical coupling with the end-caps. This would therefore make this design particularly suitable for power ultrasonic applications, reducing the possibility of debonding at the higher ultrasonic amplitudes. The experimental results demonstrate that the second cymbal design is a significant improvement on the more classic design, allowing the transducer to operate at higher voltages and higher amplitudes, exhibiting a linear response over a practical power ultrasonic device driving voltage range. The results also show that the device can be accurately tuned using finite element modelling and that the cymbal exhibits a modal response as predicted by the finite element models.