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Interior Ballistics

A Methodology of Noncontact Automatic Measurement and Development of an Online Measurement Unit on Charge Temperature of a Large Caliber Artillery

[+] Author and Article Information
Jincao Chen

e-mail: luxin@mail.njust.edu.cn
School of Energy and Power Engineering,
Nanjing University of Science and Technology,
Nanjing, Jiangsu 210094,PRC

1Corresponding author.

Manuscript received June 25, 2012; final manuscript received September 18, 2012; accepted manuscript posted January 7, 2013; published online April 19, 2013. Assoc. Editor: Bo S. G. Janzon.

J. Appl. Mech 80(3), 031401 (Apr 19, 2013) (5 pages) Paper No: JAM-12-1257; doi: 10.1115/1.4023311 History: Received June 25, 2012; Revised September 18, 2012; Accepted January 07, 2013

Charge temperature is one of the main tactical and technical indices for a large caliber self-propelled gun, and is a critical firing datum affecting the projectile muzzle velocity and gun firing accuracy. In this paper, on the basis of analyzing the heat transfer character of propellant, an unsteady-state heat conduction model describing the variation of the charge temperature is built and the finite-difference implicit schemes are theoretically deduced using the volume equilibrium method for numerical simulation. Comparing simulation curves with experiment results indicates that the physical models used reflect the real-time change process of the charge temperature with the environment temperature. A noncontact automatic online charge temperature measurement unit is developed. This unit can accurately measure the temperature field and real-time average temperature of the charge for all charge zones placed in a combat vehicle and simultaneously transfer the temperature information to the gunner task terminal computer through a controller area network (CAN) bus interface for trajectory calculation and firing data correction, ensuring the weapon system meets the requirements of digitalization and informatization.

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Figures

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Fig. 1

Schematic diagram of a charge of the large caliber self-propelled gun; 1–cartridge, 2–wear-reducing additive, 3–flash tube, 4–propellant grains

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Fig. 2

Development program of an online measurement unit

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Fig. 3

Sketch illustrating Nomenclature used in two-dimensional domain

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Fig. 4

Actual photograph of ICTS

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Fig. 5

Working principle diagram of the noncontact automatic online charge temperature measurement unit

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Fig. 6

Photograph of noncontact automatic online charge temperature measurement unit

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Fig. 7

Temperature distribution of charge at different times

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Fig. 8

Comparison between numerical simulation and experimental measurement

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