Application Cases

Experiment Name: Application of High-Voltage Amplifier on Piezoelectric Synthetic Jet Actuators

Research Direction: Active Flow Control

Experiment Content: This study systematically detected the response patterns of cerebellar neurons to low-intensity ultrasound using a two-photon in vivo calcium imaging system and proposed a novel behavioral detection paradigm for ultrasonic neuromodulation. The study revealed the direct excitatory effects of low-intensity ultrasound on the cerebellar cortex from three aspects: the sustained effects induced by ultrasound, the elimination of neuronal responses under off-target stimulation, and the induction of mouse motor behavior.

Testing Equipment: ATA-2021B high-voltage amplifier, differential pressure transmitter, NI acquisition card, piezoelectric ceramic disc, wing model (NACA0018), etc.

Experiment Process: A row of piezoelectric synthetic jet actuators consisting of seven piezoelectric ceramic discs with a diameter of 35 mm was installed along the spanwise direction in the middle of the wing. These piezoelectric ceramic discs were connected in parallel and supplied with a sine voltage by a power amplifier to achieve synchronous vibration. Meanwhile, two rows of 28 circular jet orifices were symmetrically arranged along the spanwise direction, from which the airflow was ejected for flow control. During the measurement, a total pressure probe (outer diameter: 1 mm) was installed inside the wing and placed 1 mm above the jet orifice, perpendicular to the wing surface, to measure the time-averaged jet total pressure. Assuming that the static pressure of the jet can be regarded as the ambient pressure, the time-averaged jet exit velocity can be calculated.

Figure: Diagram of the Experimental Setup for the Application of High-Voltage Amplifier on Piezoelectric Synthetic Jet Actuators

Experimental Results: As the excitation frequency increased from 0 to 1400 Hz, the time-averaged total pressure and jet velocity measured at the jet orifice are shown below. The trends of jet total pressure and velocity changes were similar at different voltages; however, when the voltage was constant, the exit velocity first increased and then decreased with the increase of excitation frequency. A distinct peak was observed at an excitation frequency of 700 Hz. The measured frequency peak (700 Hz) was close to the resonant frequency of the actuator cavity, thus making it the optimal excitation frequency. Under a sine voltage amplitude of 100 V, operating at this resonant frequency could produce a jet with a time-averaged exit velocity of 8.3 m/s.

Figure: Experimental Results

Power Amplifier Recommendation: ATA-2021B High-Voltage Amplifier

Figure: Specification Parameters of the ATA-2021B High-Voltage Amplifier