Application Cases

Experiment Name: Vibration Piezoelectric Broadband Response Energy Harvesting Structure Test

Research Direction: This study investigates the dynamic problems of vibration piezoelectric broadband response energy harvesting structures for rail vehicles, establishes a modal frequency model for I-shaped piezoelectric cantilever beams, and provides experimental validation of the vibration piezoelectric broadband response energy harvesting structure for rail vehicles.

Experiment Purpose: Targeting the vibration characteristics of rail vehicle axle boxes, an L-shaped piezoelectric cantilever beam energy harvesting structure was designed, and its frequency response was experimentally validated.

Test Equipment: Power amplifier, Signal generator, L-shaped piezoelectric cantilever beam, Vibration shaker, Dynamic control and vibration signal analysis system software, Feedback acceleration sensor, Computer, Digital storage oscilloscope, etc.

Experimental Process: The main operating frequency range of the energy harvesting structure is 15 Hz to 210 Hz. Under normal operating conditions, when the structure resonates, the deformation of the piezoelectric ceramic is maximized, resulting in the highest voltage output. Therefore, by inputting a sinusoidal acceleration signal for frequency sweep testing, the input frequency corresponding to the maximum voltage response represents the modal frequency of the structure.

Figure 1: Experimental Setup

Experimental Results: Analysis of the frequency sweep signals revealed that the first-order modal frequency response point of the piezoelectric cantilever beam is at 21 Hz. The second-order modal frequency is 43 Hz, and the third-order modal frequency is 202 Hz. The voltage response curve of this piezoelectric energy harvesting structure is shown in the figure below:

Figure 2: Voltage Response Curve of the Energy Harvesting Structure

Power Amplifier Recommendation: ATA-3090C

Figure: ATA-3090C Power Amplifier Specifications

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