Stress Wave Measurements in an Electromagnetic Launcher

Johnson, Anthony J.; Haran, Terence L.; Moon, Francis C.; Robinson, William G.

doi:10.1109/elt.2008.77

Cited by 19 publications

(6 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These results indicate that strain increases precede the arrival of the armature and that the magnitude of the strain varies with position along the bore length. Similar results were observed during previous investigations of EML strain sensors [7]. The magnitude of the strain reached the maximum at the 40-cm position of the three sampled positions, but more experimentation with a greater number of FBG detectors would be required to narrow down the absolute maximum position.…”

Section: B Fiber Bragg Grating Techniquesupporting

confidence: 87%

<italic>In Situ</italic> Measurement of Strain and Temperature for Railgun Launcher Diagnostics

Hoffman

Haran

James

et al. 2015

IEEE Trans. Plasma Sci.

View full text Add to dashboard Cite

The challenging physical environment associated with electromagnetic launchers (EMLs) makes reliable in situ measurements of physical parameters particularly difficult. The resulting lack of data hinders the validation of simulation codes that are used to support the design of new EMLs. As a result, there have been substantial efforts to develop new instrumentation that is compatible with the harsh environment of an EML. This paper will describe recent developments from Georgia Tech and U.S. Navy research to improve instrumentation capabilities for temperature and strain.Index Terms-Optical fiber sensors, railguns, strain measurement, temperature measurement. Ryan B. Hoffman received the B.S. degrees in physics and mathematics and the M.S. degree in

show abstract

Section: B Fiber Bragg Grating Techniquesupporting

confidence: 87%

<italic>In Situ</italic> Measurement of Strain and Temperature for Railgun Launcher Diagnostics

Hoffman

Haran

James

et al. 2015

IEEE Trans. Plasma Sci.

View full text Add to dashboard Cite

show abstract

“…Electromagnetic launching is a new launching technology for accelerating projectiles, which has the following features compared to traditional launch methods: short working time, high current amplitude, high current density, high contact pressure, fast relative sliding speed [1]- [3] . Under such extreme working conditions, physical characteristics between the armature and the rail, and even between the insulator and the laminated containment, which have absolutely no commonality with conventional artillery, relate to the performance of the rail gun in terms of efficiency, lifetime, and accuracy, and the multi-physical fields interact with each other [4]- [7] . The current commercial software cannot directly simulate the electromagnetic field of a moving system under non-temporal harmonic conditions, while the simulation calculation under static armature conditions cannot reflect such effects as velocity skin effect and electromagnetic field generated by the moving armature under sliding electrical contact [8] .…”

Section: Introductionmentioning

confidence: 99%

A Review of the Computational Investigation of Three-Dimensional Transient Magneto-Thermal Coupling Characteristics of Electromagnetic Railgun Armature and Rail in High-Speed Sliding Electrical Contact

Yang

2023

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

In order to investigate the dynamic process of electromagnetic field distribution, temperature change and the deformation during the launching process of electromagnetic railgun. It is necessary to conduct a three-dimensional coupled electromagnetic-temperature-structure analysis of the rail and armature, which requires the establishment of the corresponding multi-physics field model and the use of appropriate software and algorithms to complete the relevant simulation calculation and solution results. Based on this, this paper summarizes the current domestic and foreign research methods for multi-physics field characteristics under sliding electrical contact conditions, analyses the advantages and disadvantages of each method, and focuses on the updates of the three-dimensional finite element program EMAP3D based on Lagrangian description and the advantages of multi-field coupling. Finally, several considerations and operable spaces for multi-physics field coupling simulation are summarized to provide technical support for subsequent studies on multi-physics field characteristics for high-speed sliding electrical contact condition.

show abstract

“…Meanwhile, the rail is subjected to moving loads which will result in its nonlinear lateral vibration. Rail vibration can afect the contact status and shot accuracy, even causing damage between the armature and the rail [6]. In order to ensure the launch accuracy and reliability of EM railguns, it is necessary to analyze the vibration response of the rail.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Response and Parameter Analysis of Electromagnetic Railguns under Time Varying Moving Loads

Liu,

Zhang,

Wang

2023

Shock and Vibration

View full text Add to dashboard Cite

During the launch process of an electromagnetic railgun, the armature is subjected to the ampere force and moves along the rail with variable acceleration. In this period, the rail is excited by time varying moving loads and generates lateral vibration. For analysis, the rail is simplified as an Euler–Bernoulli beam, and the nonlinear dynamic equation of the beam under time varying moving loads is established. The electromagnetic repulsive force between rails, the contact pressure between the armature and the rail, and the thermal expansion pressure acting on the rail are taken into account. The lateral vibration response of the rail is achieved by using the analytical method combined with numerical integration. The variable motion of the armature during launch is also illustrated. Furthermore, the study of the effects of structure parameters on the vibration amplitude of the rail is performed. The research results can provide a theoretical basis for the structural optimization and vibration reduction of electromagnetic railguns.

show abstract

Stress Wave Measurements in an Electromagnetic Launcher

Cited by 19 publications

References 7 publications

<italic>In Situ</italic> Measurement of Strain and Temperature for Railgun Launcher Diagnostics

<italic>In Situ</italic> Measurement of Strain and Temperature for Railgun Launcher Diagnostics

A Review of the Computational Investigation of Three-Dimensional Transient Magneto-Thermal Coupling Characteristics of Electromagnetic Railgun Armature and Rail in High-Speed Sliding Electrical Contact

Dynamic Response and Parameter Analysis of Electromagnetic Railguns under Time Varying Moving Loads

Contact Info

Product

Resources

About