DOI : https://doi.org/10.18517/ijaseit.1.4.88

Possibility of Finding The Fundamental Frequency of Concrete Specimen by using Multi-Impact Loading

Rikki Vitria (1), Hilmi Sanusi (2), Roszilah Hamid (3)
(1) Department of Electrical, Electronic and System Engineering, National University of Malaysia
(2) Department of Electrical, Electronic and System Engineering,National University of Malaysia
(3) Department of Civil and Structure Engineering, National University of Malaysia
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How to cite (IJASEIT) :
Vitria, Rikki, et al. “Possibility of Finding The Fundamental Frequency of Concrete Specimen by Using Multi-Impact Loading”. International Journal on Advanced Science, Engineering and Information Technology, vol. 1, no. 4, Aug. 2011, pp. 433-5, doi:10.18517/ijaseit.1.4.88.
Citation Format :
Possibility of finding the fundamental frequency of concrete specimen by using multi-impact loading is presented in this paper. Solenoid acts as an impact generator to generate pulse trigger for the multi-impact loading. An accelerometer, ADXL330 from Analog Device detects the vibration signal resulted from the impact loading. Observation from the accelerometer output shows oscillatory signal once the concrete specimen receives a single impact. However, if the applied impact is repeated periodically or called multi-impact loading, the fundamental and harmonic will add up and constitute a pulse in the frequency domain. Duality property in Fourier theorem states that a pulse in frequency domain is a sine wave in time domain and vice versa. Each impact received by the concrete produces a vibration that comprises of fundamental and harmonic frequency The signals are analyzed using a Fast Fourier Transform (FFT) toolbox in Matlab®. The results from the study provide valuable information for a better understanding to indicate the defect in the concrete.
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