A Comparison of Different Guidance Schemes for a Direct Fire Rocket with a Pulse Jet Control Mechanism

2002 ◽  
Author(s):  
Thanat Jitpraphai ◽  
Bradley Burchett ◽  
Mark Costello
Keyword(s):  
Control Mechanism ◽  
Jet Control ◽  
Pulse Jet

Short wide angle diffuser with pulse jet control

1999 ◽  
Author(s):  
S. Raghunathan ◽  
J. Watterson ◽  
R. Cooper ◽  
S. Lee
Keyword(s):  
Wide Angle ◽  
Jet Control ◽  
Pulse Jet

Pulse-frequency modulated guidance laws for a mortar missile with a pulse jet control mechanism

2015 ◽  
Vol 119 (1213) ◽  
pp. 389-405 ◽  
Author(s):  
M. Pavic ◽  
B. Pavkovic ◽  
S. Mandic ◽  
S. Zivkovic ◽  
D. Cuk
Keyword(s):  
Sliding Mode ◽  
Design Parameters ◽  
Proportional Navigation ◽  
Adaptive Sliding Mode ◽  
Jet Control ◽  
Control Authority ◽  
The Individual ◽  
Miss Distance ◽  
Guidance Laws ◽  
Pulse Jet

AbstractThe impact point dispersion of mortar missiles can be drastically reduced with a control ring of lateral pulse jets located around the centre of gravity and a homing head to measure or to derive estimates of appropriate missile-target states, e.g. the line-of-sight rates. A simulation model including a missile as a six-degree-of-freedom vehicle, a jet pulse flight control system, and a relative missile-to-target motion was used for the comparison of four guidance laws i.e. proportional navigation guidance, augmented proportional navigation, augmented proportional navigation with rendezvous, and adaptive sliding-mode guidance. This paper focuses on the efficiency of pulse jet control on miss distance, and thus makes the assumption that sensor measurements and the guidance states required to apply each of the guidance laws are perfectly known. Proportional navigation and the adaptive sliding mode guidance exhibit a large miss distance due to limited control authority. Augmented proportional navigation is slightly better than augmented proportional navigation with rendezvous for the same design parameters and they both give small miss distances with limited control authority, but they both require a free gyro. A proper selection of the design parameters — the number of pulse jets and the magnitude of the individual pulse jet thrust for a particular dispersion of flight parameters and the instant of the guidance start — is required to achieve optimum dispersion reduction. The minimum intensity of the individual pulse jet impulse required for the ‘pin point’ accuracy (the circular error probable smaller than 1m) of the mortar missile was determined for all presented guidance laws considering dispersion from the nominal trajectory.

Frequency-Modulated Pulse-Jet Control of an Artillery Rocket

2012 ◽  
Vol 49 (2) ◽  
pp. 286-294 ◽  
Author(s):  
Bojan Pavkovic ◽  
Milos Pavic ◽  
Danilo Cuk
Keyword(s):  
Jet Control ◽  
Pulse Jet

Intelligent Optimal Pulse-Jet Control for Dual-Spin Projectiles

2021 ◽  
Author(s):  
Zhen Yang ◽  
Jian Fu ◽  
Liangming Wang ◽  
Zhi Chen
Keyword(s):  
Jet Control ◽  
Pulse Jet

Model Predictive Lateral Pulse Jet Control of an Atmospheric Rocket

2002 ◽  
Vol 25 (5) ◽  
pp. 860-867 ◽  
Author(s):  
Bradley Burchett ◽  
Mark Costello
Keyword(s):  
Jet Control ◽  
Lateral Pulse Jet ◽  
Pulse Jet

Role of the Cilia Membrane in Control of Microtubule Sliding

1980 ◽  
Vol 38 ◽  
pp. 612-615
Author(s):  
Edna S. Kaneshiro
Keyword(s):  
Control Mechanism ◽  
Beat Frequency ◽  
Surface Membrane ◽  
Ciliary Membrane ◽  
Ciliary Beating ◽  
Ciliary Reversal ◽  
Voltage Dependent ◽  
Reversal Mechanism ◽  
And Function

It is currently believed that ciliary beating results from microtubule sliding which is restricted in regions to cause bending. Cilia beat can be modified to bring about changes in beat frequency, cessation of beat and reversal in beat direction. In ciliated protozoans these modifications which determine swimming behavior have been shown to be related to intracellular (intraciliary) Ca2+ concentrations. The Ca2+ levels are in turn governed by the surface ciliary membrane which exhibits increased Ca2+ conductance (permeability) in response to depolarization. Mutants with altered behaviors have been isolated. Pawn mutants fail to exhibit reversal of the effective stroke of ciliary beat and therefore cannot swim backward. They lack the increased inward Ca2+ current in response to depolarizing stimuli. Both normal and pawn Paramecium made leaky to Ca2+ by Triton extrac¬tion of the surface membrane exhibit backward swimming only in reactivating solutions containing greater than IO-6 M Ca2+ Thus in pawns the ciliary reversal mechanism itself is left operational and only the control mechanism at the membrane is affected. The topographic location of voltage-dependent Ca2+ channels has been identified as a component of the ciliary mem¬brane since the inward Ca2+ conductance response is eliminated by deciliation and the return of the response occurs during cilia regeneration. Since the ciliary membrane has been impli¬cated in the control of Ca2+ levels in the cilium and therefore is the site of at least one kind of control of microtubule sliding, we have focused our attention on understanding the structure and function of the membrane.

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