The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Based on multi-objective generic algorithms, a novel approach to optimizing control parameters for rigid spacecraft attitude was proposed. In this technical note, optimization control method based on Collaborative adaptive and Modified Rodrigo parameters (MRP), studies in the uncertain disturbance of rigid spacecraft attitude tracking control problem. To optimize the controller parameters, the alterable...
In this paper, trajectory generation for a 4 DOF arm of SURENA III humanoid robot with the purpose of optimizing energy and avoiding a moving obstacle is presented. For this purpose, first, kinematic equations for a four DOF manipulator are derived. Then, using the Lagrange method, an explicit dynamics model for the arm is developed. In the next step, in order to generate the desired trajectory for...
A new guidance law with terminal trajectory angle constraint is designed for bank to turn flight vehicle, which aims at the fixed position ground target. The general form of guidance law with sight angle and sight angle velocity as feedback variables is presented, and the stability of it is proved via finite time convergent stability theory, which makes traditional optimal guidance as a specific example...
The development of an efficient and flexible guidance system is one of the most important aspects of studies on reusable space transportation systems such as winged rockets. We therefore propose a flight path generation method that uses a dynamic distributed genetic algorithm. This method dynamically divides and merges the individuals of some groups and thus maintains diversity in its optimization...
Two-impulse fuel-optimal rendezvous under J2 perturbation with constrained transfer time is studied in this paper. First, the mathematic model of two-body Lambert transfer of spacecraft is established. Then, J2 perturbed Lambert's problem is solved Based on analytical orbit theory via error iteration method. Furthermore, the procedure of the improved genetic algorithm for this problem is proposed,...
The energy consumption of near-space airship during the ascending phase has an direct effect on its payload capability. Because of that, it is necessary to research on trajectory optimization of airship. At first, the models of various wind interference are given from the ground to the stratosphere and the trajectory optimization scheme of airship based on numerical method is proposed. Secondly, direct...
In this paper, we present the optimum objective function for snatch weightlifting using genetic algorithm optimization. Therefore, it would be possible to study snatch weightlifting more accurately, because the biomechanical parameters in this movement including the body trajectory and forces and torques acting in the joints, depend on the objective function. In this study, kinematics and dynamics...
The optimal trajectory of a swim-out acoustic decoy defending against an acoustic homing torpedo is studied. First, the dynamic models of the torpedo and submarine, and several trajectory models of the decoy are established. The factors that affect the countermeasure effectiveness are analyzed. Then based on the assessment criterion, genetic algorithm is used to obtain the optimal parameters of the...
The use of electrical signals to restore the function of paralyzed muscles is called functional electrical stimulation (FES). FES is a promising method to restore mobility to individuals paralyzed due to spinal cord injury. FES induced movement control is a significantly challenging area, mainly emanating from various characteristics of the underlying physiological/biomechanical system. An approach...
Maximum crossrange guidance with heat flux, overload factor and dynamic pressure constraints is required when lifting body reentry vehicle (LBRV) needs to travel long crossrange to reach the target point. A new maximum corssrange guidance method is presented for LBRV. The proposed guidance method converts maximum crossrange guidance into two subproblems, i.e. trajectory design subproblem and trajectory...
Ball-screw-driven mechanism has been used in many industrial applications. In microscopic displacement range, resonant modes, dead time in addition to nonlinear friction of this mechanism deteriorate the positioning performance. To obtain high precision response in this displacement range, a control scheme was proposed as a composition of two types of control methodology: a feedforward compensator...
This paper examines the problem of optimizing the charge trajectory of a plug-in hybrid electric vehicle (PHEV), defined as the timing and rate with which the PHEV obtains electricity from the power grid. Two objectives are considered in this optimization. First, we minimize the total cost of fuel and electricity consumed by the PHEV over a 24-hour naturalistic drive cycle. We predict this cost using...
This work aims to develop an artificial intelligence for a helicopter pilot. That is, a system that learns to fly a helicopter the way a human pilot would. It draws on the benefits of using inverse simulation and genetic algorithms to model systems similar to human process. The goal is to define tasks for the helicopter and have the pilot find control settings that carry out those tasks. The inverse...
Simulating the snatch weightlifting technique by means of dynamic formulation and optimizing this movement using Genetic Algorithm is the main purpose of this study. Snatch weightlifter is modeled by an open kinematic chain. The problem is defined as the optimization of the movement of this model from the first position to the predefined second position while considering the specific optimum criterion...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.