低频簧片仪冲击特性与破坏规律分析

低频簧片仪是低频段冲击谱测量的主要装置,其结构为一组具有不同固有频率的集中质量悬臂梁。舰艇受到爆炸冲击时,集中质量悬臂梁易发生塑性变形或断裂,直接影响测量结果。为分析集中质量悬臂梁抗冲击能力,利用模态叠加法建立集中质量悬臂梁在冲击载荷作用下理论模型,分析集中质量悬臂梁在冲击载荷作用下动态响应及破坏规律。研究结果表明:集中质量悬臂梁固有频率越高,应力峰值越大,越容易发生塑性变形或断裂;对于集中质量悬臂梁,冲击载荷破坏能力仅与极限谱位移有关,极限谱位移越大,其破坏能力越大;负波延迟对集中质量悬臂梁的破坏能力具有一定影响,可在常规抗冲击设计中通过增大极限谱位移考虑此影响。

Analysis of Shock Characteristics and Failure Law for Low-frequency Reed Gage

Low-frequency reed gage is the main apparatus of the low-frequency shock spectrum, the structure of it has a cantilever beam with a lumped-mass and a different natural frequency. When the ship shocked about by the explosion, centralized quality cantilever beam prones to plastic deformation or fracture then has a direct impact on the measurement results. In order to analyze the anti-shock function of the centralized quality cantilever , By using the modal superposition method established a theory model that the centralized quality cantilever beam was undergoing impact load, analysis its dynamic response and failure law. The results show that the higher natural frequency of the cantilever and the peak stress, the more prone to plastic deformation or fracture. For the centralized quality cantilever beam, the damage capability of the load capacity only related to the limit displacement spectrum. The greater the displacement ,the greater the destructive capability. Negative wave retarder has a certain influence on the destructive potential of the concentrated mass cantilever beam. When increase the limit spectrum displacement we can consider the influence of it in the design of conventional shock.