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Factors Influencing the oscillator frequency transducer

Author: QiaoJiaPing
Tutor: WangFuLiang
School: Central South University
Course: Mechanical and Electronic Engineering
Keywords: piezoelectric transducer vibrator the bolt pre-stress the resonant frequency equivalent circuit
CLC: TB552
Type: Master's thesis
Year: 2011
Downloads: 57
Quote: 1
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Abstract


The sandwich piezoelectric ceramic ultrasonic transducer is the key part of ultrasonic wire bonding equipment. At present, the design model of transducer is over simplified, so it is very difficult to guide the product development. The conformity of the resonant frequency is poor in the assembly process because of some factors. For this reason, the effect on the frequency of transducer vibrator, which is played by the pre-stress and the aging process, was studied in the experiment. The mechanical equivalent circuit with considention of pre-stress was developed, and the traditional vibrator design method was optimized. It is very important and practical value to improve the level of transducer design and to better the conformity of the resonant frequency. The main work includes:1. The finite element model of the transducer vibrator was established on Ansys10.0 simulation platform. The influence laws on the vibrator frequency, of the bolt pre-stress, front and back slab lengths and the piezoelectric constant, were studied respectively by the different loading conditions. It is observed that the resonant frequency with the increasing of slabs’length decrease, the frequency and the mode of vibrator would be affected by the piezoelectric constant.2. The experiment device was designed in order to measure the pre-stress of bolt. The effect of the pre-stress on the vibrator frequency was studied.3. The experiment system of the vibrator aging in high tempreture was found. The trends of the resonant frequency and the impedance in the aging process were studied by experiments, drawn about the resonant frequency range of 2.5 to 3kHz, the impedance range of 2 to 3Ω. No significant effect on them is played by temperature.4. The import PZT was contrast with the domestic, and the dispersion of the piezoelectric ceramic frequency was measured in the experiment. It is found that the diffience of PZT is very small and the consistenty of PZT frequency is good. The result shows that the effect on the vibtator frequency is very small.5. The mechanical equivalent circuits of the piezoelectric ceramic and frequency equation under force were derived. Based on the electromechanical analogy principle, the role of the pre-stress was substitute into the equivalent circuit of the traditional transducer vibrator, and the frequency equation under the pre-stress was derived. The traditional vibrator design method was optimized.

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CLC: > Industrial Technology > General industrial technology > Acoustic engineering > Ultrasonic Engineering > Ultrasonic transducer
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