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梯度弹体结构轴向振动仿真研究
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作者 王卿硕 郭磊 +4 位作者 高洪寅 何源 王传婷 陈鹏翔 何勇 《兵工学报》 EI CAS CSCD 北大核心 2024年第S01期191-199,共9页
弹体侵彻过程中伴随着振动,降低了毁伤能力。将梯度材料应用于弹体设计并开展减振研究,基于梯度梁轴向振动理论,分析梯度弹体轴向振动频率特性。采用数值模拟的方法得到梯度弹体的轴向振动固有频率并与理论结果对比分析,总结偏差原因。... 弹体侵彻过程中伴随着振动,降低了毁伤能力。将梯度材料应用于弹体设计并开展减振研究,基于梯度梁轴向振动理论,分析梯度弹体轴向振动频率特性。采用数值模拟的方法得到梯度弹体的轴向振动固有频率并与理论结果对比分析,总结偏差原因。研究梯度弹和均质弹在不同位置的主导振动模态,分析两种弹体的屈曲模态。研究结果表明,梯度弹主要呈现1阶振动模态,模态数量少,其1、2阶共振频率均低于均质弹并且梯度弹和均质弹均发生1阶和2阶的屈曲。研究成果可为解决弹体侵彻过程中振动失稳问题提供思路。 展开更多
关键词 梯度弹体 轴向振动 数值模拟 振动模态
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The Pressure Gradient Elastic Wave: Energy Transfer Process for Compressible Fluids with Pressure Gradient 被引量:1
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作者 Yan Beliavsky 《Journal of Mechanics Engineering and Automation》 2013年第1期53-64,共12页
The temperature separation was discovered inside the short vortex chamber (H/D = 0.18). Experiments revealed that the highest temperature of the periphery was 465 ℃, and the lowest temperature of the central zone w... The temperature separation was discovered inside the short vortex chamber (H/D = 0.18). Experiments revealed that the highest temperature of the periphery was 465 ℃, and the lowest temperature of the central zone was -45 ℃ (the compressed air was pumped into the chamber at room temperature). The objective of this paper is to proof that this temperature separation effect cannot be explained by conventional heat transfer processes. To explain this phenomenon, the concept of PGEW (Pressure Gradient Elastic Waves) is proposed. PGEW are kind of elastic waves, which operate in compressible fluids with pressure gradients and density fluctuations. The result of PGEW propagation is a heat transfer from area of low pressure to high pressure zone. The physical model of a gas in a strong field of mass forces is proposed to substantiate the PGEW existence. This physical model is intended for the construction of a theory of PGEW. Understanding the processes associated with the PGEW permits the possibility of creating new devices for energy saving and low potential heat utilization, which have unique properties. 展开更多
关键词 PGEW (Pressure Gradient Elastic Waves) temperature separation Ranque effect vortex chamber heat transfer energysaving low potential heat utilization.
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