Multilayered carbon fiber-reinforced polymers (CFRP) are increasingly used in aircraft components because of their superior mechanical properties. However, composite materials are vulnerable to impact loads, resulting in delamination-type damage which, if unnoticed, could lead to catastrophic structural failure. The objective of this research was to investigate possibilities to improve damage detection and the localization using signal processing methods. Numerical modeling using the semi-analytical finite element (SAFE) method was performed to obtain guided wave dispersion curves and to perform modal analysis. From the modal analysis, mode for inspection of the composite with delamination type defects was selected. From the numerical simulation, mode interaction with delamination along the longitudinal direction was analyzed and the location of the defect was estimated by measuring the time of flight (ToF) of the signal using Hilbert transform (HT) and continuous wavelet transform (CWT). The CWT has shown better results in estimating the delamination location compared with HT. The depth of delamination was characterized in the frequency domain by comparing the amplitude of the mode. Inverse fast Fourier transform (IFFT) is recommended to reconstruct the reflected and transmitted modes for better damage detection and to reduce the complexity of signal interpretation.
Replacing chemical propellant and using electric power that generate the muzzle power to propel the rocket is done since 1846. There were productive research conducted to achieve velocity of 2000-3000 m/s, which cannot achieved using conventional propellant. These velocities are capable of penetrating the armor vehicles and high-density materials.Research is conducted to increase the velocity and stealth technology to penetrate missile defense system. However, the advanced technology capable of detecting from small drone to high velocity missile. This research give the conceptual design of the two-staged missile capable penetrating the defense shield using only kinetic energy by unconventional propulsion system. One stage act as the prey to the incoming missile and other system enter the shield with its velocity higher than any other interceptor missile. This missile uses Lorentz force to propel the projectile towards the target.
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