A new guidance scheme for the problem of Low-thrust transfer between inclined orbits is developed within the framework of optimal control theory. The objective of the guidance scheme is to provide the appropriate thrust steering program that will transfer the vehicle from an inclined low earth orbits to the high earth orbits. The presented guidance scheme is determined using Pontryagin’s princi...

In this study, analytical techniques and fuzzy logic methods are applied to the dynamic modelling and efficient swimming control of a biomimetic robotic fish, which is actuated by an ionic polymer-metal composite (IPMC). A physical-based model for the biomimetic robotic fish is proposed. The model incorporates both the hydrodynamics of the IPMC tail and the actuation dynamics of the IPMC. The c...

Abstract Airborne wind energy is an emerging technology that harvests with flight systems connected via a tether to the ground. In project “EnerGlider”, flying wing meant fly fully automated by its own control units. This contribution discusses challenges and trim this during vertical take-off landing under influence of horizontal velocity. High velocities can lead unstable untrimmed states con...

Quadrotor vehicles show great potential over a range of tasks, but effective control in windy environments continues to be a challenge. This paper develops a thrust-saturated controller on the Lie group SO(3) that uses flow sensing in order to reduce the effect of gusts on the vehicle. Designing the controller on SO(3) establishes almost-global exponential stability, and avoids the pitfalls of ...

This study considers the optimal control problem of maximizing the raise in the periapsis of a spacecraft orbit using continuous variable low-thrust propulsion. The dynamics of the spacecraft in the two-body system are modeled using Lagrange’s planetary equations with the classic orbit elements as the state variables. Control is provided via the propulsion thrust components in the radial and ci...

sensorless speed torque control of induction machines has been widely used in many industrial applications. the simple method of direct vector control can provide tacholess control as well as more complex approaches. in this method, the motor flux can be obtained by measuring voltage and current and integrating motor back electromotive force. the only required motor parameter is stator resistan...

visceral leishmaniasis is a deadly parasitic disease that is transmitted via the bite of a female sand fly, phlebotomus argentipes. the highest burden of this disease is in northern india. in 2005, india embarked on an initiative with ne­pal, bangladesh, and the world health organization to eliminate visceral leishmaniasis by 2015. with the goal of 1 case in 10,000 people still unmet, it is pru...

In this paper, a new design of permanent magnet linear synchronous motor (PMLSM) for electromagnetic launcher system (EMLs) has been investigated in terms of the requisite amount of average launching thrust force and thrust force ripple minimization through finite element method. EMLs are a kind of technology used to develop thrust force and launch heavy loads with different applications includ...

Abstract As a rocket engine for thrust vector control system of high reliability and redundancy, precision, the requirements lightweight, servo test can quickly certain level fast data processing location, transient, frequency characteristic indexes, motor using GLINK as bus. Moreover, first is an all-in-one machine with four drives controls, so required to have ability actuators simultaneously...

In the last decade, energy based control theory has undergone a significant breakthrough in dealing with underactated mechanical systems with two successful and similar tools, controlled Lagrangians and controlled Hamiltanians (IDA-PBC). However, because of the complexity of these tools, successful case studies are lacking, in particular, MIMO cases. The seminal theoretical paper of controlled ...