Background. One ofthe key components ofpostural control is the motor system's ability to produce appropriate torques to counteract perturbations that may lead to a loss of balance. Evidence exists to show that there is an age-related decline in absolute strength and in the ability to rapidly produce torque. The relationship between age-related decreases in these voluntary torque production capa...

Developing artificial neural network (ANN), a model to make a correct prediction of required force and torque in ring rolling process is developed for the first time. Moreover, an optimal state of process for specific range of input parameters is obtained using Genetic Algorithm (GA) and Particle Swarm Optimization (PSO) methods. Radii of main roll and mandrel, rotational speed of main roll, pr...

the efficiency of induction motors decreases at light loads. efficiency optimizer control systemsadjust the motor flux value to achieve the best efficiency in a wide range of load variations. reduced fluxoperation has some other benefits such as power factor improvement and torque ripple reduction. the latter isan important issue in a direct torque controlled induction motor drive. in this pape...

A minimum commanded torque change criterion based on the optimization principle is proposed as a model that accounts for human voluntary motion. It is shown that the trajectory of human arm motion can be well reproduced by the model. In the point-to-point movement, the calculation of the torque based on the minimum commanded torque change criterion requires a highly nonlinear calculation, and i...

In this work, a quasi-time-optimal, nonlinear state-feedback control for the torsional torque of a two-mass system (TMS) is presented. The control scheme considers constraints in the stator voltage and currents of the driving machine: a permanent magnet synchronous motor (PMSM). Its design is based on results of the more general framework of optimal control and its implementation constitutes an...

Article history: Received 30 January 2012 Received in revised form 13 June 2013 Accepted 21 June 2013 Available online 18 July 2013 Wepresent amethod for offline optimal control of a two-link ball pitching robot with the aim of throwing a ball as far as possible. The pitching robot is connected to a motor via a non-linear torsional spring at the shoulder joint. The elbow joint is passive and lo...

Abstract Cogging torque is one of the main factors that deteriorate performance permanent magnet motor. In order to reduce cogging built-in motor, a method optimizing Rib and DminMag groove motor was proposed. Firstly, relationship between analyzed through expression torque. Secondly, optimal were found by finite element parametric calculation, compared with pre-optimization torque, significant...

It is demonstrated by means of the optimal control theory that energy cost spin-orbit torque induced reversal a nanomagnet with perpendicular anisotropy can be strongly reduced proper shaping both in-plane components current pulse. The time-dependence switching pulse minimizes associated Joule heating derived analytically in terms required time and material properties. providing tradeoff betwee...