| Box structure is widely used in modern industry, national defense and scientific research. As a basic structure on the protection engineering, people have studied its anti-blast wave and debris impact damage to armor-piercing effect, which have obtained many encouraging results. But we still not fully master shock and vibration protective performance about the box structure. However, under certain conditions, shock and vibration protective performance effects a major impact on the body structure .So it is necessary to study the vibration protective performance of this structure.First of all ,we designed seven kinds of different shielding of the box structure. vibration signals of the box structure ware measured by the piezoelectric acceleration sensor measuring system under the air blast. After the time domain vibration signal analysis, we found that energy absorption of the structure was closely related to its interlayer material. This energy absorption ability was depended on the energy absorption effect of interlayer material and the overall structure of the two factors result. After the frequency domain analysis, we found these differences in the effect of energy absorption ware due to the relative proportions of the low-frequency harmonic component and the high-frequency harmonic component in frequency domain. In other words, more proportions the low-frequency harmonic component of the all, the better effect of the energy absorption, and vice versa. After the wavelet transform with multi-resolution analysis, we can study the explosion experiment of the local characteristics of vibration signals. When quantitatively analysis the signal part of the low-frequency and high-frequency with wavelet Transform, we can revealed the time-frequency characteristics of anti-detonation signal, which could provided a more convenient and practical tool to analysis vibration signals. Finally, this Papers simulated some program by ANSYS/LS-DYNA software。... |
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