Structural Design Optimization and Prestress Simulation of the Laminate-Containment Launcher

The laminate-containment launcher is a high-efficiency electromagnetic railgun launcher (EMRL), which uses a laminate structure to reduce eddy current loss. However, the research on the design optimization of the laminate-containment launcher with prestress and mass as the goal is rarely mentioned....

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Bibliographic Details
Published in:IEEE transactions on plasma science Vol. 49; no. 9; pp. 3003 - 3008
Main Authors: Wang, Jun, Li, Baoming
Format: Journal Article
Language:English
Published: New York IEEE 01.09.2021
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects:
Algorithms
Axial stress
Computer simulation
Containment
Current loss
Design
Design optimization
Eddy current testing
Eddy currents
Electromagnetic railgun launcher (EMRL)
Glass
Glass fibers
Hoop stress
Hoops
Insulation
Interference
laminate-containment
Laminates
Launchers
Multiple objective analysis
Nonlinear programming
nonlinear programming algorithm
nonlinear regression fitting
Optimization
Parameters
prestress
Prestressing
Railguns
Rails
Steel
Structural design
Structural engineering
Thickness
ISSN:0093-3813, 1939-9375
Online Access:Get full text
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Summary:The laminate-containment launcher is a high-efficiency electromagnetic railgun launcher (EMRL), which uses a laminate structure to reduce eddy current loss. However, the research on the design optimization of the laminate-containment launcher with prestress and mass as the goal is rarely mentioned. In this article, some key parameters of the laminate-containment launcher-the magnitude of interference <inline-formula> <tex-math notation="LaTeX">s </tex-math></inline-formula>, the axial thickness of the steel laminate <inline-formula> <tex-math notation="LaTeX">t_{s} </tex-math></inline-formula> and insulation laminate <inline-formula> <tex-math notation="LaTeX">t_{i} </tex-math></inline-formula>, the thickness of inner glass fiber <inline-formula> <tex-math notation="LaTeX">r_{g} </tex-math></inline-formula>, and the radial thickness of the laminate <inline-formula> <tex-math notation="LaTeX">r_{l} </tex-math></inline-formula>-are studied. On this basis, the influence of the five parameters on the hoop stress of the rail is fitted as a function by using the multiple nonlinear regression method. Then, the maximum hoop stress <inline-formula> <tex-math notation="LaTeX">f_{\mathrm {1max}} </tex-math></inline-formula> and the maximum hoop stress difference <inline-formula> <tex-math notation="LaTeX">f_{\mathrm {2max}} </tex-math></inline-formula> of the rail are calculated by using a nonlinear programming algorithm. Finally, the maximum hoop stress <inline-formula> <tex-math notation="LaTeX">f_{\mathrm {1max}} </tex-math></inline-formula>, the maximum hoop stress difference <inline-formula> <tex-math notation="LaTeX">f_{\mathrm {2max}} </tex-math></inline-formula>, and the maximum mass <inline-formula> <tex-math notation="LaTeX">f_{\mathrm {3max}} </tex-math></inline-formula> are taken as the reference values, and the optimal solution of the multiobjective function is obtained by using the weighted nonlinear programming algorithm. The results can be described as follows: the hoop stress of the rail changes linearly with the increase of the magnitude of interference, while the hoop stress changes approximately quadratic with the change of other parameters. Through the optimization of nonlinear programming algorithm with weighted form, the optimal design under different weighted values is obtained, which has a small error compared with the calculation results of ANSYS. The important characteristic that the hoop stress of the laminate-containment launcher presents wavy variation along the axial direction is obtained by numerical simulation. These results can provide theoretical guidance for the structural design of the laminate-containment launcher.
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ISSN:0093-3813
1939-9375
DOI:10.1109/TPS.2021.3101951