Application Cases

Experiment Name: Study on Vibration Performance of Multilayer Ceramics

Test Equipment: Voltage amplifier, Waveform generator, Mechanical vibration tester, Laser emitter, Computer, etc.

Experimental Process:

Figure 1: Structural Diagram of the Mechanical Vibration Testing System

The vibration velocity of piezoelectric ceramics under an electric field was analyzed using a mechanical vibration tester system, which includes a laser emitter, vibration isolation platform, waveform generator, high-voltage amplifier, and control computer. The structure of the testing system is shown in Figure 1.

Figure 2: Time-Domain and Frequency-Domain Signals of Piezoelectric Ceramic Vibration

When a small-signal alternating electric field is applied to the piezoelectric material, mechanical vibration at the same frequency is generated due to the inverse piezoelectric effect. The vibration velocity of the sample, which characterizes the dynamic response of the material, can be measured using a mechanical vibration tester. The voltage signal input from the waveform generator is a sine wave, amplified 200 times by the high-voltage amplifier, and applied to the multilayer ceramic. In the time-domain display, the vibration velocity of the ceramic over time appears as a sine wave. The time-domain signal is Fourier-transformed to obtain the frequency-domain signal, which represents the amplitude of the vibration velocity in different frequency ranges. Since the mechanical vibration occurs at the same frequency as the input voltage signal with a 90° phase lag, only one frequency amplitude is observed on the amplitude-frequency curve. The time-domain and frequency-domain signals are shown in Figure 2.

Experimental Results:

Figure 3: Time-Domain Signals of Multilayer Ceramic Vibration Velocity Under Different Voltages

Figure 3 shows the time-domain curves of the vibration velocity of the multilayer ceramic under different input voltages, all at a frequency of 100 Hz. The curves exhibit perfect sinusoidal waveforms, indicating minimal external interference and a good signal-to-noise ratio. As the input voltage increases, the amplitude of the vibration velocity also gradually increases. The maximum vibration velocity at each voltage can be derived from Figure 4. When the input voltage is 320 V, the maximum vibration velocity of the multilayer ceramic is 1.86 mm/s. At the same frequency, a higher voltage results in a greater change in voltage per unit time, leading to an increased displacement rate of the ceramic and a corresponding increase in vibration velocity.

Figure 4: Variation of Multilayer Ceramic Vibration Velocity with Voltage

Figure 5: Time-Domain Signals of Multilayer Ceramic Vibration Velocity Under Different Frequencies

In addition to the magnitude of the input voltage, the vibration velocity of the piezoelectric material is also influenced by the frequency of the input voltage. Figure 5 shows the time-domain curves of the multilayer ceramic vibration velocity under different frequencies, with the input voltage fixed at 320 V. The vibration velocity of the ceramic gradually increases with the rise in voltage frequency. Figure 6 shows the maximum vibration velocity of the ceramic at each frequency. When the voltage frequency is 500 Hz, the vibration velocity can reach 8.26 mm/s.

Figure 6: Variation of Multilayer Ceramic Vibration Velocity with Frequency

Voltage Amplifier Recommendation: ATA-2088

Figure: ATA-2088 High-Voltage Amplifier Specifications

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