Application Cases

Experiment Name: Vibration Testing of Gradient Sawtooth Bending Wave Metamaterial Beams

Experiment Content: This experiment aims to measure the vibration characteristics of gradient bending wave metamaterials. It includes measuring the propagation wavefield of bending waves in thin plates to infer the Young's modulus of the plate material; and measuring the out-of-plane displacement fields of transmitted bending waves in uniform sawtooth and gradient sawtooth bending wave metamaterial beams, comparing these with the experimental results of straight beams to obtain the transmission spectrum of bending waves in metamaterial beams.

Research Direction: Elastic Wave Metamaterials; Structural Vibration Control

Testing Equipment: ATA-308 power amplifier; laser vibrometer; signal generator; piezoelectric ceramic, etc.

Figure 1: Schematic diagram of the experimental setup

Experiment Process:

1. Set up the experimental platform for measuring the transmission spectrum of bending waves, with the main instruments being the signal generator, laser vibrometer, power amplifier, and piezoelectric ceramic.

2. Bond the piezoelectric ceramic to the test sample and connect it to the power amplifier to generate incident bending waves under pulse signal excitation.

3. Input the sine pulse signal generated by the signal generator into the power amplifier, and then input the amplified pulse signal into the piezoelectric ceramic.

4. Use the laser vibrometer to detect the out-of-plane bending wave displacement amplitude at a specific location on the test sample, compare it with the experimental results of the straight beam, and calculate the bending wave transmission spectrum of the metamaterial beam.

Experiment Results:

Figure 2: Experimental Results

The following experimental results were obtained through this test:

1. By measuring the wavelength of bending waves propagating in the thin plate, the Young's modulus of the material used in the plate was inferred, providing a key material parameter for theoretical calculations and numerical simulations.

2. The transmission spectrum of bending waves obtained through experimental measurement shows that the gradient bending wave metamaterial beam has good broadband vibration control effects, with a frequency range of approximately 2-25 kHz.

3. Theoretical analysis and experimental verification provide new ideas for the design of broadband bending wave isolation.

Power Amplifier Recommendation: ATA-308C Power Amplifier

Figure: Specifications of the ATA-308C Power Amplifier