Armature design for coaxial induction launchers

Andrews, J.A.; Devine, J.R.

doi:10.1109/20.101109

Cited by 60 publications

(12 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The hydrostatic component with the accuracy of 1 mm is determined using the Saastamoinen model (Saastamoinen, 1973). The wet component is defined as a difference between ZTD and ZHD and is then converted to IWV values following an approach proposed by Askne and Nordius (1987) and Mendes (1999).…”

Section: Gps Methodsmentioning

confidence: 99%

Quality assessment of integrated water vapour measurements at the St. Petersburg site, Russia: FTIR vs. MW and GPS techniques

et al. 2017

View full text Add to dashboard Cite

Abstract. The cross-comparison of different techniques for atmospheric integrated water vapour (IWV) measurements is the essential part of their quality assessment protocol. We inter-compare the synchronised data sets of IWV values measured by the Bruker 125 HR Fourier-transform infrared spectrometer (FTIR), RPG-HATPRO microwave radiometer (MW), and Novatel ProPak-V3 global navigation satellite system receiver (GPS) at the St. Petersburg site between August 2014 and October 2016. As the result of accurate spatial and temporal matching of different IWV measurements, all three techniques agree well with each other except for small IWV values. We show that GPS and MW data quality depends on the atmospheric conditions; in dry atmosphere (IWV smaller than 6 mm), these techniques are less reliable at the St. Petersburg site than the FTIR method. We evaluate the upper bound of statistical measurement errors for clear-sky conditions as 0.29 ± 0.02 mm (1.6 ± 0.3 %), 0.55 ± 0.02 mm (4.7 ± 0.4 %), and 0.76 ± 0.04 mm (6.3 ± 0.8 %) for FTIR, GPS, and MW methods, respectively. We propose the use of FTIR as a reference method under clear-sky conditions since it is reliable on all scales of IWV variability.

show abstract

Section: Gps Methodsmentioning

confidence: 99%

Quality assessment of integrated water vapour measurements at the St. Petersburg site, Russia: FTIR vs. MW and GPS techniques

et al. 2017

View full text Add to dashboard Cite

show abstract

“…The lump-element model is used in the early stage, such as AXICOIL [12], WARP-10 [15], SLINGSHOT [16]. It has the advantages such as simple principle, easy realization and fast computation speed, but lack of field description like the distribution of current density, magnetic density, and also has a great error.…”

Section: B Field-circuit Coupled Modelmentioning

confidence: 99%

“…Changing the structure of the driving coil account for the magnetic force and heat during launching [9]- [11]; adjusting the structure and material of the armature improves heat and force [12]- [14]. With respect to the inherent characteristic of synchronous induction coilgun-armature capture effect that an opposite force is produced after the armature passes through the driving coil, relative research reports are less published.…”

Section: Introductionmentioning

confidence: 99%

Investigation of armature capture effect on synchronous induction coilgun

Zhang

Guo

et al. 2014

2014 17th International Symposium on Electromagnetic Launch Technology

View full text Add to dashboard Cite

In order to obtain high velocity and high energy conversion efficiency on synchronous induction coilgun, the armature capture effect which is the inherent characteristic for the coilgun need to be analyzed. The reason for armature capture effect is firstly deduced and analyzed through lumped-element circuit model, and then the quantificational result is obtained based on the field-circuit coupled model. According to the analytic result, the method to minimize the armature capture effect is proposed from the viewpoint of the magnetic couple between the driving coil and armature. Several measures are analyzed through the finite element simulation. The simulation result shows that adjusting the power parameters, such as adding the capacitance or initial voltage, and decreasing the crowbar resistance, and adjusting armature parameters, such as decreasing the mass or changing the structure, can minimize the armature capture effect and increase the system efficiency. The measures are validated through a 4-stage induction coilgun. Comparing the experimental result with the simulation result, adjusting the armature parameter which minimizes the armature capture effect accords with the fact well. It provides valuable reference for induction coilgun design.

show abstract

“…Before optimize these parameters, a numerical code can well model the coilgun system is primary [5]. Numerical models are very useful for analysis and designing coilguns, e.g., the cylindrical current sheet model [6], the current filament method [7], the circuit approach [8], and the hybrid finite and boundary elements (FE-BE) method. In practice, the FE-BE method is a robust general approximation process.…”

Section: Introductionmentioning

confidence: 99%

Validation of a coilgun design code

He¹,

Gao²,

Song³

et al. 2012

2012 16th International Symposium on Electromagnetic Launch Technology

View full text Add to dashboard Cite

A coilgun design code is programmed according to the formulas described the inductive coupling between the thrust coils and the armature, the dynamic response of the armature, and the ohmic heating in the thrust coils and armature. The algorithms determined the operation statuses of the driven pulse forming network are presented. The convergence of the code is analyzed. The maximum time-step and mesh size of the armature are dependent on the rise time of the driven pulse current. The code is validated by comparing the simulated results with the experimental ones. The simulated current wave is agreement with the experimental results. However, the simulated velocity is greater than the measured one about 6.5%. The convergence and validation of the code indicate that it can be used for the primary design for a coilgun system.

show abstract

Armature design for coaxial induction launchers

Cited by 60 publications

References 5 publications

Quality assessment of integrated water vapour measurements at the St. Petersburg site, Russia: FTIR vs. MW and GPS techniques

Quality assessment of integrated water vapour measurements at the St. Petersburg site, Russia: FTIR vs. MW and GPS techniques

Investigation of armature capture effect on synchronous induction coilgun

Validation of a coilgun design code

Contact Info

Product

Resources

About