Affiliations: Corresponding Author, Department of Civil and
Environmental Engineering, University of Nevada, Las Vegas, 4505 Maryland
Parkway, Las Vegas, NV, USA | Department of Civil and Environmental Engineering,
University of Nevada, Las Vegas, NV, USA | Department of Mechanical Engineering, University of
Nevada, Las Vegas, NV, USA
Abstract: Electronic devices, especially those having high performance
capabilities, are sensitive to mechanical shocks and vibrations. Failure of
such devices in smart projectiles caused by vibrations has been observed. The
currently accepted methodology to protect electronic devices in smart
projectiles is use of stiffeners and dampers. However these methods are not
effective in protecting the electronic devices from high frequency
accelerations in excess of 5,000 Hz. Therefore, it is important to find more
effective methods to reduce high frequency vibrations for smart projectiles. In
this study, layered cylindrical structures are studied experimentally and
computationally to understand the effect of impedance mismatch in axial
acceleration response under an impact loading. Experiments are conducted by
applying impact forces at one end of cylindrical structures and measuring
accelerations at the other end. Experimental results suggest that high
frequency accelerations in layered structures could be less compared to those
in homogeneous cylinders if a returning wave from the end of the projectile
does not interfere with the applied impact force. Computational studies using
finite element analysis (FEA) verified the experimental results of our
interference hypothesis.
Keywords: Impact, mitigation, acceleration, impedance, FEA and layered cylindrical structure
