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A three-dimensional (3D) geometric guidance law (GGL) was recently proposed based on the differential geometric curve theory, whose performance was thought to be better than that of 3D pure proportional navigation (PPN). In this paper, with the help of the dimension-reduction method and the Lyapunov-like approach, the performance of 3D GGL against a randomly maneuvering target with limited maneuverability...
A velocity control approach based on the incremental backstepping (IB) is proposed to enhance the accuracy of the velocity control for the small unmanned aerial vehicles (SUAVs).The velocity control model is first formulated based on the SUAV movement equations and the thrust model. Then, the IB method is applied to the velocity control law design. Feedback of acceleration eliminates sensitivity to...
In this paper, the strategy of an evader using a decoy, against a pursuer in a planar engagement scenario, is considered. The decoy launch angle (decoy heading) and decoy launch time are the decision variables. An analytic expression is derived for the range of decoy launch angles, as a function of launch time that guarantees the effectiveness of the decoy in luring the pursuer. This is used to define...
Robust and stable control is a requirement for navigation of self-driving cars. Some approaches in the literature depend on a high number of parameters that are often difficult to estimate. A poor selection of these parameters often reduces considerably the efficiency of the control algorithms. In this paper we propose a simplified control system for autonomous vehicles that depends on a reduced number...
The main goal of this paper is to develop a multi-class traffic flow and emission model that is suited for on-line model-based control. Multi-class traffic flow and emission models take into account the heterogeneous nature of traffic networks. In comparison with single-class models, these models are more accurate. Using more accurate model results in better description of the traffic network. However,...
Selfconsistent problem acceleration ions flow with present electron flow and cloud of electrons with zero average velocity are studied. One used kinetical description of electron flow in case, when distribution of electrons depends not only on integrals of motions. Cold ions can by accelerated to energy, exceed temperature of electrons.
An analytical solution of self-coordinated beam dynamics equation is developed. The high current relativistic electronic bunches are used for generation of wake fields in wakefield structures with dielectric filling. Propagation under influence of both own beam created by dipole modes of Cherenkov field and outer focusing and deflecting fields is investigated. The received solutions can be used for...
A simple control model for beam in RFQ channelis considered. This model is based on the previously developed approach [1]and allowsto perform optimization of the RFQ channelin acceptable time.1. O.I. Drivotin, D.A. Ovsyannikov. Modelingof high intensity charged particle beams. St. Petersburg, St. Petersburg State Univ., 2003.
The problem of cosmic rays reacceleration (secondary acceleration) in the interstellar galactic medium is considered with the use of fractional differential equations. Involving the fractional operator is justified by by taking into account non-uniform (fractal-type) time-distribution of the acceleration events possible connected with diffusion type of spatial motion.
Based on the analysis of relative orbit dynamics for GEO (geostationary orbit, GEO) satellite and LQG (Linear Quadratic Gaussian, LQG) algorithm, this paper proposed a station-keeping control method for GEO satellite, which realized north-south station-keeping and west-east station-keeping simultaneously. To further verify the effectiveness of the proposed method, corresponding mathematical simulation...
After rendezvous and docking, the mass and mass center of target satellite can change greatly. In order to identify the mass and mass center of target satellite, research is made about the identification of mass and mass center about target satellite. As to the mass of target satellite, according to the information when the tracking satellite is located in different relatively stable position with...
When the wave piercing catamaran is sailing in the ocean at a high speed, longitudinal motion might bring some adverse effects on its performance. The vertical acceleration generated makes the passengers and crew sick and the catamaran will be in a short-time failure. On general conditions, a ride control system is adopted to solve these problems. Firstly, a pitching and heaving motion model for the...
In this paper mathematical modelling of a vehicle crash test based on a single mass is studied. The models under consideration consist of a single mass, a spring and/or a damper. They are constructed according to the measured vehicle speed before the collision and measured vehicle accelerations in three directions at the centre of gravity. A new model of nonlinear spring-mass-damper is also proposed...
Particle swarm optimization (PSO) is a stochastic global optimization approach whose search characteristics are controlled by three parameters, inertial weight w, cognitive parameter c1 and social parameter c2. Large parameter values facilitate exploration by searching new horizons of solution space. On the other hand, small parameter values facilitate exploitation by searching the neighborhood. An...
Airflow from the propeller, called the propeller slipstream or propwash, plays an important role in the aerodynamics of small unmanned aerial vehicles (UAVs). In fact, flights at low forward speeds or extreme angle of attack (AoA) maneuvers of small fixed-wing UAVs are possible only because the propeller slipstream provides the airflow necessary to maintain lift and control under these conditions...
Several studies have focused on deriving kinematic formulations of simulated flapping wing micro air vehicles (FWMAV). However, very few used real-life flight data and none have compared the predicted aerodynamic forces and moments across different kinematic formulation principles. Hence, the present study compares and assesses the quality of simple equations of motion against complex multi-body formulations...
This paper proposes a new approach to the boundary value problem of finding a vehicle path from an initial state, defined by a position and velocity vector, to a target position. The presented method explicitly considers magnitude constraints on both the velocity and the acceleration of the vehicle when determining the path. A semi-analytic and computationally efficient algorithm is employed, applicable...
This paper proposes a new control strategy and design for auxiliary power source using in Battery Hybrid Electric Vehicle (BHEV) based on acceleration power. The control strategy takes actual speed, acceleration and terminal voltage of supercapacitors (SCs) into account for controlling the energy and power demanded. The detail design of the auxiliary power source and its dynamic control are demonstrated...
The in-situ exploration of small Solar System bodies (such as asteroids or comets) is becoming a central objective for future planetary exploration. Such bodies are characterized by very weak gravitational fields, which make hopping mobility platforms one of the preferred mobility strategies for microgravity surface exploration, as recognized by space agencies worldwide. However, little is known about...
In this paper, a dynamical equation of single rotary inverted pendulum is established, which based on Lagrange equation for the swing-up control problem of single rotary inverted pendulum. The algorithm of energy compensation control is proposed on the basis of this theory, and the experimental device based on DC servo motor during the single rotary inverted pendulum is established. The swing-up control...
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