Model predictive control (MPC) is applied to the Caltech ducted fan, a thrust-vectored flight experiment. A real-time trajectory generation software based on spline theory and sequential quadratic programming is used to implement the MPC controllers. Timing issues related to the computation and implementation of repeatedly updated optimal trajectories are discussed. Results show computational s...

This talk will define an ”average control system” for system that have a conservative drift and a very small control. The prototype is low thrust orbital transfer of earth sattelites. Using averaging to treat small perturbations of integrable systems is not new; the originality here is that averaging can be performed before the variations of the control are decided, thus yielding really an ”ave...

The n-body problem for low-thrust vehicles with optimal thrust control is formulated for the case of constant thrust with coast. A successive two-body approximation to the n-body problem is also developed under the assumption of tangential thrust during the planetocentric leg. This approximation involves one arbitrary parameter the planetocentric radius at the patch point whose best value can b...

In this paper the speed control method of LIM, which lead to optimal control characteristic of motor such as thrust, flux and current, is proposed. The performance of the proposed DTFC method is analyzed with considering end-effect. DTFC is one of the improved control methods which employ several PI controllers. Proper adjustment of coefficients of the PI controller plays an important role in t...

Wherein, the thrust fluctuation is an important factor affecting the positioning accuracy of the workpiece table. Many scholars have studied the thrust fluctuation reduction methods to improve the motor performance. Some articles optimized structure size [1], or the analytical method ignoring the end effect [2], or using look-up tables [3]. Another scholars have adopted active control strategy ...

Use of a wall-climbing robot for inspection or maintenance of wall surfaces has been anticipated for a long time. Three quite different models have been developed in our laboratory. The present model can move on a wall by using the thrust force of a propeller and can fly whenever it is required. Its mechanism and control system are discussed.

A retargeting procedure is developed for use as a nonlinear low thrust guidance scheme. The selection of a control program composed of a sequence of inertially fixed thrust-acceleration vectors permits all trajectory computations to be made with closed form expressions, and allows the controls to be represented by constant parameters, thrust-acceleration vectors and thrusting times. By requirin...

In this paper, we tackle the problem of trajectory tracking for a particular class of underactuated vehicles with full torque actuation and a single force direction (thrust), which is fixed relative to a body attached frame. Additionally, we consider that thrust reversal is not available. Under some given assumptions, the control law that we propose is able to track a smooth reference position ...