Application Cases

Experiment Name: Research on Wing De-Icing Method Based on Piezoelectric Actuator Using High-Voltage Amplifier

Research Direction: Piezoelectric Effect, Doppler Laser Vibrometry

Experimental Principle: The Doppler laser vibrometer operates based on the principle of Doppler laser vibrometry. When a rectangular plate with four clamped edges is excited by an actuator, laser scanning of various points on the aluminum plate can yield information such as vibration modes, vibration displacement, and vibration velocity.

Testing Equipment: ATA-2021B High-Voltage Amplifier, Doppler Laser Vibrometer, Control System, Piezoelectric Patches, Aluminum Plate

Figure: Working Principle of the Vibration Measurement Experiment

Experimental Procedure:
The two piezoelectric patches and the icing surface are not on the same side. The rectangular plate is clamped using two 10 mm thick aluminum plates and secured with bolts. The weight of the clamping fixtures is significantly greater than that of the rectangular aluminum plate, ensuring the four edges of the plate remain fixed. The signal emitted by the control unit of the vibrometer is amplified by the power amplifier to excite the two piezoelectric patches, achieving a peak-to-peak excitation voltage of 50 V. The working principle of the vibration measurement experiment is shown in the figure above. Vibration measurement experiments were conducted on the rectangular plate with four clamped edges. The Doppler laser displacement measurement system was controlled via a computer, with the control unit emitting a 0-2 kHz sweep signal. Through the power amplifier, the voltage in the vibration measurement experiment did not need to be very high, amplified to a peak-to-peak value of 50 V. The signal drove the piezoelectric patches located on the rectangular plate, causing the plate to vibrate. The Doppler laser vibrometer collected information such as vibration modes, vibration displacement, and vibration velocity, which could be presented graphically after software processing.

Experimental Results:
The vibration of the thin plate was collected by the Doppler laser vibrometer, and after processing, the frequency response curve of the thin plate under the action of two piezoelectric actuators was obtained, as shown in the figure below.

Figure: Frequency Response Curve of the Thin Plate Under Actuator Excitation

The curve in the above figure shows the frequency response of the aluminum plate in the range of 0-2 kHz. By taking the peak points from this curve, the resonant frequency points of the rectangular plate could be determined. Since the vibration of the rectangular plate is three-dimensional and relatively complex, this paper only analyzes the out-of-plane vibration, which is more important for de-icing. The resonant frequency values obtained from the analysis were compared with simulation and theoretical calculation results, as shown in the figure below. Observing the placement of the piezoelectric patches and the third-order natural vibration mode, it can be seen that when the same excitation signal is applied to both piezoelectric patches, the amplitudes of the excited second-order mode cancel each other out due to phase differences, meaning the peak of the second-order mode disappears due to cancellation. Therefore, the second-order resonant frequency could not be observed in the vibration measurement experiment.

Figure: Numerical Values of Different Vibration Modes

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