正弦波激励下刚性开孔结构内压响应特性实验

摘要

利用声音振动发生原理研制了专门用于内压机理研究的实验装置,对单一开孔的刚性结构在正弦波气压激励下的内压动力特性进行了多参数对比实验.实验研究结果表明:开孔结构在外部动压力作用下会发生腔体共振,随开孔面积增大,腔体共振频率增大阻尼比减小；随孔口深度及内部容积增大,腔体共振频率减小阻尼比增大；对于深宽比很小且开孔面积相同的孔口,孔口形状对腔体共振频率影响不大,对阻尼比有一定影响.%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.