Application Cases

Experiment Name: Experimental Study on Impact Damage Detection of CFRP Plates

Experimental Principle:
CFRP plates with damage of varying energy levels were prepared via drop-weight impact. After determining the optimal excitation frequency for the transducer, ultrasonic guided waves were used to detect damage signals. Through signal processing, qualitative and quantitative damage assessment was achieved, followed by damage localization using the time-of-flight method combined with a sensor array.

Experimental Block Diagram:

Experimental Setup Photos:

Experimental Procedure:
The experiment began by preparing damaged specimens with multiple energy gradients using a drop-weight impact tester in accordance with ASTM standards. Specimens with impact energies of 40 J and 120 J were selected as detection targets. A frequency-sweeping platform was then established, employing a 5-cycle Hanning-windowed sinusoidal signal sweeping from 40 kHz to 110 kHz, to determine 70 kHz as the optimal excitation frequency for the giant magnetostrictive transducer. Subsequently, an ultrasonic guided wave detection platform was set up. Signals were excited at this optimal frequency, and the received signals underwent denoising, compression, and short-time Fourier transform (STFT) time-frequency analysis. Finally, damage qualification was achieved by comparing signal modes, quantification was accomplished using an improved damage factor, and precise damage localization was realized by combining the time-of-flight method with a sensor array.

Application Fields:
Aerospace, rail transportation, automotive industry, wind power and energy, civil engineering, general industry and equipment

Application Scenarios:
CFRP plates, low-velocity impact testing, ultrasonic guided wave detection, frequency-sweeping experiments, time-of-flight method, elliptical localization method, giant magnetostrictive transducer, drop-weight impact tester, laser vibrometer, Savitzky-Golay filtering, resampling compression, short-time Fourier transform, damage localization, qualitative detection, quantitative detection

Product Recommendation: ATA-2000 Series High-Voltage Amplifier

Figure: ATA-2000 Series High-Voltage Amplifier Specifications and Parameters