Application Cases

Experiment Name: Viscosity Monitoring of Damping Fluid in Viscous Dampers Based on Piezoelectric Materials

Research Direction: Biology

Experimental Content: Observe the electrical signals emitted by the sensor by applying voltage to the positive and negative terminals of the viscous damper.

Test Objective: Use the time-domain diagram of the damping fluid after pressurization to determine the interference caused by pressure wave signals propagating directly along the inner wall of the specimen during the experiment.

Testing Equipment: Signal generator, ATA-2021B voltage amplifier, data acquisition system, laptop computer, viscous damper.

Experimental Procedure:

Experimental Method: As shown in the figure above, two piezoelectric ceramic sensors were used, one as an actuator and the other as a sensor. An arbitrary waveform generator emitted a sinusoidal excitation signal ranging from 100 kHz to 300 kHz, which was amplified to 180 Vp-p by the ATA-2021B power amplifier. Based on the inverse piezoelectric effect of the piezoelectric ceramics, the electrical signal was converted into vibration of the sensor, causing the PZT actuator to vibrate and generate pressure waves. These pressure waves propagated through the damping fluid and induced vibration in the PZT sensor. Through the direct piezoelectric effect of the piezoelectric ceramics, the vibration signal of the sensor was converted into an electrical signal, which was collected by the data acquisition system. By analyzing the collected data, the viscosity of the damping fluid in the viscous damper was monitored in real time.

Experimental Results:

Figure 1

Figure 2

Figure 3

Figures 1 and 2 show the time-domain diagrams of the received signals when there is no damping fluid and when the damping fluid viscosity is 13800 mm²/s, respectively. Figure 3 shows the time-domain diagrams of the received signals after filtering for the conditions of no damping fluid and a damping fluid viscosity of 13800 mm²/s. It can be observed that the amplitude of the signal propagating along the inner wall of the specimen is significantly smaller than that of the signal propagating through the damping fluid, verifying the effectiveness of the cork block and thus eliminating the interference of pressure wave signals propagating directly along the inner wall of the specimen on the experimental results.

Figure: ATA-2021B High-Voltage Amplifier Specifications and Parameters