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Supervised by Ministry of Industry and Information Technology of The People's Republic of China Sponsored by Harbin Institute of Technology Editor-in-chief Yu Zhou ISSNISSN 1005-9113 CNCN 23-1378/T

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Related citation:Wei He,Xiangzhong Bai,Song Chen.Mechanical Analyses of Rails and Panels in a Rectangular Electromagnetic Rail Launcher[J].Journal of Harbin Institute Of Technology(New Series),2018,25(5):53-60.DOI:10.11916/j.issn.1005-9113.16222.
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Mechanical Analyses of Rails and Panels in a Rectangular Electromagnetic Rail Launcher
Author NameAffiliation
Wei He College of Architectural Engineering and Mechanics, Yanshan University, Qinhuangdao 066004,Hebei,China 
Xiangzhong Bai College of Architectural Engineering and Mechanics, Yanshan University, Qinhuangdao 066004,Hebei,China 
Song Chen College of Architectural Engineering and Mechanics, Yanshan University, Qinhuangdao 066004,Hebei,China 
Abstract:
In the present work, rails and panels in a rectangular electromagnetic rail launcher were simulated as finite-length bi-layer elastic foundation beams. Mechanical equilibrium equations were established for these bi-layer beams under the electromagnetic and contact forces between armatures and rails. With the application of Generalized Krylov function, analytical expressions of rails (upper beam) and panels (lower beam)’ deformation and stress were generated. The analytical results agree well with ANSYS calculations even in the presence of electromagnetic and armature’s forces, a strong indication of the reliability of the analytical approach. The current work lays the foundation for mechanical analyses of rectangular electromagnetic rail launchers, and offers help in future designs and calculations in marine, aerospace, and civil engineering.
Key words:  rectangular electromagnetic rail launcher  Generalized Krylov function  bi-layer elastic foundation beam  mechanical equilibrium equation  ANSYS
DOI:10.11916/j.issn.1005-9113.16222
Clc Number:TJ301
Fund:
Descriptions in Chinese:
  

方口径电磁轨道发射导轨及壁板的力学分析

何威,白象忠 ,陈松

(燕山大学 建筑工程与力学学院,河北 秦皇岛 066004)

创新点说明:

1)将方口径电磁轨道发射装置的发射轨道在电磁力和电枢力共同作用下,其轨道及壁板的受力分析简化为分布载荷与集中载荷作用下的双层弹性地基梁,完善单层弹性地基梁模型的不足之处。

2)对轨道及壁板的刚度、强度的解析分析,为减小发射装置的体积、重量而提高其强度、刚度及使用寿命提供设计依据。

研究目的:

完善方口径电磁轨道发射装置的轨道及壁板变形与应力状态单层弹性地基梁模型的不足,引入双层弹性地基梁模型、提高计算精度,为动力分析打下基础。

研究方法:

1) 将方口径电磁轨道发射装置的发射轨道和壁板简化为有限长双层弹性地基梁,在电磁力和电枢对轨道接触力的作用下,建立双层梁的力学平衡方程;通过建立“广义克雷洛夫函数”,求解轨道(上梁)及壁板(下梁)挠度、内力、应力的解析表达式。

2)给出了电磁力与电枢力共同作用下导轨及壁板变形与应力状态的算例,算例计算结果与采用ANSYS数值分析结果进行对比。

结果:

1)建立了在电磁力与电枢对轨道接触力的用下的方口径电磁轨道发射装置的力学平衡方程。

2)推导了方口径电磁轨道发射装置轨道和壁板在电磁力和电枢接触力作用下的挠度、内力、应力解析表达式。

3)将本文的解析方法与算例相结合,并与ANSYS数值方法计算结果进行对比,二者之间相吻合。

结论:

1)将方形截面电磁轨道发射装置的轨道及壁板简化为双层弹性地基梁,对其进行刚度和强度计算,与将其简化为单层弹性地基梁进行计算会更加接近于工程实际。

2)通过算例分析可知——在电磁载荷的作用下,发射轨道与壁板的抗弯刚度及各层之间的弹性常数是决定轨道及壁板刚度与应力状态的关键因素。

3)本文的研究结果,给出了求解双层弹性地基梁的力学分析解析解的一种有效方法;将计算结果与ANSYS数值分析结果对比,可相互佐证上述解的可靠性。

关键词:方口径电磁轨道发射装置;广义克雷洛夫函数;双层弹性地基梁;力学平衡方程; ANSYS

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