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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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Canard aerodynamic model force diagram.
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Related In: Results  -  Collection


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fig2: Canard aerodynamic model force diagram.

Mentions: In the following section, only the total resultant force and moment equations for canard 1 are expressed, whereas all other canards can be computed in the same manner with suitable modifications. The canard angle of attack is computed in the same manner as the body angle of attack except for the local relative velocity at the canard computation point which is used as follows:(19)αC1=δc1+tan−1(wc1uc1),where δc1 is the deflection angle of canard 1. The aerodynamic force and moment due to canard 1, as shown in Figure 2, are given by(20){FCX1FCY1FCZ1}={LC1wc1uc12+wc12−DC1uc1uc12+wc120−LC1uc1uc12+wc12−DC1wc1uc12+wc12},{LC1MC1NC1}={FCZ1ry1−FCY1rz1FCX1rz1−FCZ1rx1FCY1rx1−FCX1ry1}.


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

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

Canard aerodynamic model force diagram.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

fig2: Canard aerodynamic model force diagram.
Mentions: In the following section, only the total resultant force and moment equations for canard 1 are expressed, whereas all other canards can be computed in the same manner with suitable modifications. The canard angle of attack is computed in the same manner as the body angle of attack except for the local relative velocity at the canard computation point which is used as follows:(19)αC1=δc1+tan−1(wc1uc1),where δc1 is the deflection angle of canard 1. The aerodynamic force and moment due to canard 1, as shown in Figure 2, are given by(20){FCX1FCY1FCZ1}={LC1wc1uc12+wc12−DC1uc1uc12+wc120−LC1uc1uc12+wc12−DC1wc1uc12+wc12},{LC1MC1NC1}={FCZ1ry1−FCY1rz1FCX1rz1−FCZ1rx1FCY1rx1−FCX1ry1}.

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