Research on Instability Boundaries of Control Force for Trajectory Correction Projectiles

Li, Rupeng; Li, Dongguang; Fan, Jieru

doi:10.1155/2019/6362835

Cited by 5 publications

(8 citation statements)

References 29 publications

(32 reference statements)

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“…For a 15 kg, 105 mm projectile, not more than 40N (0.34 g) could be applied. Li et al 29 continued this work and concluded that the same projectile would remain stable provided F c 2 [ À 35.48, 58.33]. The provided F c is within the limits defined by these frameworks; projectile stability is ensured by satisfying the gyroscopic stability criterion.…”

Section: Quasi-dynamic Guidance Law Formulationmentioning

confidence: 96%

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A novel quasi-dynamic guidance law for a dynamic dual-spin projectile with non-conventional, asymmetric roll constraints

Norris

Economou

Hameed

2022

Proceedings of the Institution of Mechanical Engineers, Part G:

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A novel quasi-dynamic guidance law (QDGL) is presented for a dual-spin projectile (DSP) with unconventional constraints on roll direction. A 7 degree-of-freedom (DOF) dynamic model is established and the projectile operational mechanism is presented with a description of how it is used to enact control. The QDGL is presented and a parametric study is conducted to show how the QDGL parameters affect the system response. A procedure of using batches of Monte Carlo simulations is described, to numerically compare the system response with different QDGL configurations. A genetic algorithm is then used to optimise both the innate system parameters and PID controller gains. The disturbance rejection capabilities of the optimal QDGL are then evaluated along with the performance against different target profiles. It was found that the GA optimised QDGL is able to provide satisfactory control capabilities against static and dynamic targets.

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Section: Quasi-dynamic Guidance Law Formulationmentioning

confidence: 96%

“…This section describes the seven DOF dynamic model of the DSP, which has previously been used to investigate DSPs 21,[27][28][29] and is a derivative of the well-established model for a conventional projectile used by McCoy. 30 Subscript F denotes the forward section and subscript A denotes the aft section.…”

Section: Projectile Dynamicsmentioning

confidence: 99%

A novel quasi-dynamic guidance law for a dynamic dual-spin projectile with non-conventional, asymmetric roll constraints

Norris

Economou

Hameed

2022

Proceedings of the Institution of Mechanical Engineers, Part G:

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“…e allowable maximum amplitude of projectile angle of attack is referenced to control the angle of attack increment produced by correction action, and controlling the angle of attack increment does not exceed the limited allowable value ∆δ max . According to (10) and (11), projectile motion state changes after correction. A change in each parameter is obtained:…”

Section: Control Of the Air Valve Working Pulse Width ∆Tmentioning

confidence: 99%

“…e stable flight of the projectile is controlled by limiting the pulse impulse as well as the distance between the pulse and the mass center. Wernert et al [8][9][10] studied the stability of canard-guided dual-spin stabilized projectiles.…”

Section: Introductionmentioning

confidence: 99%

Control Strategies for Flight Stability of Trajectory Correction Projectile with Air-Ducts Structure

Cui

Liu

Jiang

et al. 2022

Mathematical Problems in Engineering

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Aiming at the controllability of spin-stabilized projectile trajectory correction, a new two-dimensional trajectory correction projectile model with a controllable air-ducts structure suitable for the spin-stabilized projectile is proposed in this paper. Furthermore, control strategies of the projectile in the corrected configuration are studied to ensure a stable flight. The correction scheme of the projectile is innovated on the basis of the ram air control mechanism. The air-ducts structure is designed inside the projectile body, and the internal air valve is used to control the lateral air-jet to achieve trajectory correction of the projectile. This is a new two-dimensional trajectory correction scheme with a relatively simple control method. Firstly, the correction mechanism of the new air-ducts structure projectile is analyzed. Secondly, based on the dynamic equation of the projectile, the key parameters of the impulse air valve control, including the safe range of the working pulse width and frequency, are calculated, and the corresponding control strategies are proposed. Finally, the flow field of the projectile in the corrected configuration of the terminal trajectory is numerically simulated, and aerodynamic parameters of the projectile are obtained. Through stability conditions established in this paper and combined with aerodynamic parameters, the validity of the proposed projectile stable flight control strategies is confirmed. The innovations of this paper include: (1) a proposed new aerodynamic configuration model with the air-ducts structure for the spin-stabilized projectile and (2) proposed innovative stable flight control strategies of the corrected configuration projectile. The numerical simulation results show that, compared with the reference projectile without air-ducts structure, the lateral force of the air-ducts structure projectile can produce a radial correction effect on the moving projectile. The simulation results of control strategies indicate that the control strategies can ensure stable flight of the corrected configuration projectile under different conditions.

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“…Therefore, the installation of a fuze with an infrared image sensor can not only improve attack accuracy, but also meet different mission requirements, which has received much attention. Li [2][3][4] proposed a novel trajectory correction fuze based on an image sensor. Then, the correction strategy of mortars was studied to improve the attack accuracy.…”

Section: Introductionmentioning

confidence: 99%

Mechanical and Electronic Video Stabilization Strategy of Mortars with Trajectory Correction Fuze Based on Infrared Image Sensor

Zhang

2020

Sensors

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For a higher attack accuracy of projectiles, a novel mechanical and electronic video stabilization strategy is proposed for trajectory correction fuze. In this design, the complexity of sensors and actuators were reduced. To cope with complex combat environments, an infrared image sensor was used to provide video output. Following the introduction of the fuze’s workflow, the limitation of sensors for mechanical video stabilization on fuze was proposed. Particularly, the parameters of the infrared image sensor that strapdown with fuze were calculated. Then, the transformation relation between the projectile’s motion and the shaky video was investigated so that the electronic video stabilization method could be determined. Correspondingly, a novel method of dividing sub-blocks by adaptive global gray threshold was proposed for the image pre-processing. In addition, the gray projection algorithm was used to estimate the global motion vector by calculating the correlation between the curves of the adjacent frames. An example simulation and experiment were implemented to verify the effectiveness of this strategy. The results illustrated that the proposed algorithm significantly reduced the computational cost without affecting the accuracy of the motion estimation. This research provides theoretical and experimental basis for the intelligent application of sensor systems on fuze.

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Research on Instability Boundaries of Control Force for Trajectory Correction Projectiles

Cited by 5 publications

References 29 publications

A novel quasi-dynamic guidance law for a dynamic dual-spin projectile with non-conventional, asymmetric roll constraints

A novel quasi-dynamic guidance law for a dynamic dual-spin projectile with non-conventional, asymmetric roll constraints

Control Strategies for Flight Stability of Trajectory Correction Projectile with Air-Ducts Structure

Mechanical and Electronic Video Stabilization Strategy of Mortars with Trajectory Correction Fuze Based on Infrared Image Sensor

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