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

Rikki Vitria, Hilmi Sanusi, Roszilah Hamid


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.


Fundamental frequency; Multi-impact loading; solenoid; accelerometer; Fast fourier transform

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DOI: http://dx.doi.org/10.18517/ijaseit.1.4.88


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Published by INSIGHT - Indonesian Society for Knowledge and Human Development