Application Cases

Experiment Name: Frequency Modulation of Elastic Waves in Cylindrical Shell Structures Based on Mechanoelectric Coupled Metamaterials

Research Direction: Vibration and Noise Control

Experiment Content: The experiment aims to achieve frequency modulation of elastic waves in cylindrical shell structures using an active control method of "single sensing - dual driving." First, the theory of elastic wave control in cylindrical shell structures is derived, and a mechanoelectric coupled metamaterial unit is designed with a time-varying transfer function. Second, the frequency modulation function of the metamaterial unit under transient conditions is analyzed using simulation techniques in an axial cylindrical shell structure model. Finally, experimental analysis samples of the axial cylindrical shell mechanoelectric coupled metamaterial unit are fabricated, and frequency-domain data of elastic waves are collected to verify the frequency modulation function.

Testing Equipment: ATA-2042 high-voltage amplifier, signal generator, oscilloscope, accelerometers, etc.

Experiment Process: Initially, the signal generator produces a pulse signal as an external vibration source. When the piezoelectric sensor detects the elastic wave signal, it is transmitted to the digital feedforward control circuit, where the transfer function processes the signal. The processed result is then amplified by the high-voltage amplifier to apply a time-varying voltage of equal magnitude but opposite direction to the piezoelectric driver of the metamaterial unit. This completes the frequency modulation of the transmitted elastic waves.

Test Results: Based on the mechanoelectric coupling characteristics and using the "single sensing - dual driving" active control method, a metamaterial unit suitable for frequency modulation of elastic waves in cylindrical shell structures has been designed. This unit can convert the transmission frequency of incident waves in the range of 7kHz to 12kHz according to requirements.

Power Amplifier Recommendation: ATA-2042 High-Voltage Amplifier

Figure: Specifications of the ATA-2042 High-Voltage Amplifier