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Accuracy improvement capability of advanced projectile based on course correction fuze concept.

Elsaadany A, Wen-jun Y - ScientificWorldJournal (2014)

Bottom Line: The simulation results show that the impact accuracy of a conventional projectile using these course correction modules can be improved.The drag ring brake is found to be highly capable for range correction.On the other hand, the canard based-correction fuze is found to have a higher effect on the projectile drift by modifying its roll rate.

View Article: PubMed Central - PubMed

Affiliation: Nanjing University of Science and Technology, Nanjing 210094, China.

ABSTRACT
Improvement in terminal accuracy is an important objective for future artillery projectiles. Generally it is often associated with range extension. Various concepts and modifications are proposed to correct the range and drift of artillery projectile like course correction fuze. The course correction fuze concepts could provide an attractive and cost-effective solution for munitions accuracy improvement. In this paper, the trajectory correction has been obtained using two kinds of course correction modules, one is devoted to range correction (drag ring brake) and the second is devoted to drift correction (canard based-correction fuze). The course correction modules have been characterized by aerodynamic computations and flight dynamic investigations in order to analyze the effects on deflection of the projectile aerodynamic parameters. The simulation results show that the impact accuracy of a conventional projectile using these course correction modules can be improved. The drag ring brake is found to be highly capable for range correction. The deploying of the drag brake in early stage of trajectory results in large range correction. The correction occasion time can be predefined depending on required correction of range. On the other hand, the canard based-correction fuze is found to have a higher effect on the projectile drift by modifying its roll rate. In addition, the canard extension induces a high-frequency incidence angle as canards reciprocate at the roll motion.

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Drift versus range.
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Related In: Results  -  Collection


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fig13: Drift versus range.

Mentions: Figure 13 demonstrates that the canard based trajectory is successful in reducing drift error, recording drift of less than 615 m, compared with the nominal case which recorded drift of 800 m. Figure 14, showing the projectile roll rate profiles, demonstrates the slight increase in roll damping that occurs during canards extension, where the roll rate is reduced from 1845 rad/sec at the apex of flight to 257 rad/sec within nearly 30 sec. In Figure 15, the total velocity-time histories varied only on the order of a 2.7%, demonstrating that the drag penalty associated with canards of this size is relatively small.


Accuracy improvement capability of advanced projectile based on course correction fuze concept.

Elsaadany A, Wen-jun Y - ScientificWorldJournal (2014)

Drift versus range.
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4109594&req=5

fig13: Drift versus range.
Mentions: Figure 13 demonstrates that the canard based trajectory is successful in reducing drift error, recording drift of less than 615 m, compared with the nominal case which recorded drift of 800 m. Figure 14, showing the projectile roll rate profiles, demonstrates the slight increase in roll damping that occurs during canards extension, where the roll rate is reduced from 1845 rad/sec at the apex of flight to 257 rad/sec within nearly 30 sec. In Figure 15, the total velocity-time histories varied only on the order of a 2.7%, demonstrating that the drag penalty associated with canards of this size is relatively small.

Bottom Line: The simulation results show that the impact accuracy of a conventional projectile using these course correction modules can be improved.The drag ring brake is found to be highly capable for range correction.On the other hand, the canard based-correction fuze is found to have a higher effect on the projectile drift by modifying its roll rate.

View Article: PubMed Central - PubMed

Affiliation: Nanjing University of Science and Technology, Nanjing 210094, China.

ABSTRACT
Improvement in terminal accuracy is an important objective for future artillery projectiles. Generally it is often associated with range extension. Various concepts and modifications are proposed to correct the range and drift of artillery projectile like course correction fuze. The course correction fuze concepts could provide an attractive and cost-effective solution for munitions accuracy improvement. In this paper, the trajectory correction has been obtained using two kinds of course correction modules, one is devoted to range correction (drag ring brake) and the second is devoted to drift correction (canard based-correction fuze). The course correction modules have been characterized by aerodynamic computations and flight dynamic investigations in order to analyze the effects on deflection of the projectile aerodynamic parameters. The simulation results show that the impact accuracy of a conventional projectile using these course correction modules can be improved. The drag ring brake is found to be highly capable for range correction. The deploying of the drag brake in early stage of trajectory results in large range correction. The correction occasion time can be predefined depending on required correction of range. On the other hand, the canard based-correction fuze is found to have a higher effect on the projectile drift by modifying its roll rate. In addition, the canard extension induces a high-frequency incidence angle as canards reciprocate at the roll motion.

Show MeSH