Experiment of internal pressure response characteristics excited by sinusoidal external pressure for rigid structure with opening
A special experimental device was developed for researching internal pressure mechanism by using principle of sound vibrations,and the multi-parameter comparative experiments were conducted to study the internal pressure response characteristics for rigid structure with single opening excited by sinusoidal external pressure.Experimental results show that cavity resonance occurs for structure with opening excited by dynamic external pressure.With the opening area increasing,the cavity resonance frequency increases and damping ratio decreases.With the orifice depth and internal volume increasing,the cavity resonance frequency decreases and the damping ratio increases.For the openings with small aspect ratio and the same opening area,orifice shape has little effect on the cavity resonance frequency but has some influence on damping ratio.