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.
In this paper an axial flux magnetic gear (AFMG) is proposed that has an integrated outer stator. This axial flux magnetically geared motor (AFMGM) is unique in that the stator shares the high-speed rotor with the AFMG, so there is no need for a separate rotor. The high speed and low speed rotors use a flux-focusing typology. The stator is mounted outside the AFMG and this makes the design mechanically...
Electromagnetic linear actuator (ELAs) have the advantage over hydraulic and mechanical mechanisms of being able to operate with higher efficiencies and are potentially more reliable.
In this paper, a hybrid method is proposed for maximum power point tracking (MPPT) of solar photovoltaic system. This method combines three point-weight and Fuzzy Logic Control (FLC) methods. First, the direction of change in the voltage or no change compared to the state before is determined based on three point-weight method. Then a change in the voltage magnitude is done based on FLC. Three point-weight,...
In this paper, the predictive based reliability analysis of an electrical hybrid distributed generation (EHDG) is presented. The effect of a battery bank, as an electrical storage system, is investigated on the reliability of a distributed generation system (DGS) which forms an EHDG with a photovoltaic system as the main source. More precisely, to solve the problem of the intermittent nature of the...
Global warming, increasing of energy demand, depletion of fossil fuel resources and therefore, higher energy costs are the key factors that make wise utilizing systems, which are more reliable and environmentally friendly. Meanwhile distributed generation (DG), such as renewable energy systems and combined heating, cooling and power system (CHCP) plants, play an important role in this context. Compare...
In this paper a new systematic method to derive the equation of motion of n-rigid robotic manipulators with revolute joints is considered. The equation of motion for this robotic system is obtained based on Kane formulation. Based on the developed formulation, an algorithm is proposed that recursively and systematically derives the equation of motion. Finally, a computational simulation for a manipulator...
Micromachining of micro electromechanical systems such as other fabrication processes has inherent variation that leads to uncertain dimensional and material properties. Methods for optimization under uncertainty analysis can be used to reduce micro device sensitivity to these uncertainties in order to create a more robust design, thereby increasing reliability and yield. In this paper, approaches...
Simulation results based on a comprehensive model show that the amount of mode splitting in typical long period fiber grating (LPFG)-based bending sensor rises linearly in small range of bending. According to simulation results, this range of sensing in a typical LPFG-based bending sensor reaches to almost 5m−1. On the other hand, fiber Bragg grating (FBG)-based bending sensor behaves linearly in...
In this Paper, in order to improve the performance of sliding mode controller, a fuzzy logic sliding mode controller is proposed. The slope of sliding surface is changed based on error and its derivative by a fuzzy logic and reached to the predetermined slope. This decreases reaching phase and speeds up system's response, and with increasing the slope of the sliding surface, final tracking error decreases...
In this paper, in order to control the relative motion for spacecraft formation flying, an optimal sliding mode controller has been proposed. This controller is designed based on the linearized equations of relative motion under two-body dynamics or Hill's equations and applied to nonlinear system that is subjected to external disturbances. Firstly, an augmented system composed of the original system...
One of the displacement measurement methods is using inductive sensors, usable for both small and large displacement. In this paper a 3-D linear inductive displacement sensor has been introduced. The proposed sensor consists of 2 elements that can measure 5cm with accuracy of 100ìm in large scale measurement. The first part is a coil and the second is a movable core that moves within the coil and...
This paper presents Bio Fuel Cell (BFC) without catalyst. In this paper partly complete model of one implantable BFC has been simulated and fabricated which was experimented by Krezenmacher and some others in an in-vitro medium. The material of cathode and anode is cloth Carbone, and the membrane is made of PVA-PAA, which is an electrically insulated polymer and it has the capability of diffusion...
In the studied micro pump, magnetic micro beads have been used for both pumping and valving purposes. Micro beads, which have been concentrated and actuated magnetically, fill the cross section of the channel of the micro pump. Movement of the magnetic field in any direction causes the micro beads to move in the same direction, so the micro beads can pump the fluid. Current carrying structures have...
This paper presents a direct torque control technique for brushless DC motors with non-sinusoidal back electromotive force. Direct torque control has some benefits such as faster torque response and reduced torque ripple for driving the brushless DC motors. In order to solve the problems associated with conventional PI speed controller, a speed control based on fuzzy logic controller is proposed to...
Considering the widespread use of induction motors, proper control of them in order to increase efficiency, improve performance characteristics and etc., has become more important. Induction motor control systems are nonlinear systems with many constraints, therefore tuning of such systems require the use of some approximations and simplifications in the induction motor model or linearization of control...
This paper presents a direct torque control technique for Brushless DC motors with non-sinusoidal back electromotive force. Direct torque control has some benefits such as faster torque response and reduced torque ripple for driving the Brushless DC motors. The Sliding mode observer, which is robust to parameter uncertainties, can be used to estimate the back-EMF and generate the torque. It is employed...
In this paper we introduced a new enterprise architecture as NSSA for the establishment of networks without any infrastructure. Enterprise architecture is the following general structure planning system using information technology to optimize IT strategies to achieve business direction leads. In this architecture we use a component in this architecture, it's a framework of organizational architecture...
Ad-Hoc network is a collection of wireless mobile nodes without any fixed base station infrastructure and centralized management. Each node acting as both a host and a router moves arbitrarily and communicates with others via multiple wireless links. The primary application for ad hoc networks has been for military operations. As the military has become more dependent on computer networks, it has...
Attitude control of a micro-satellite is analyzed with sliding control method. With this method, attitude dynamics of satellite is robust against uncertainties and unknown disturbances. Nonlinear and coupled model in this paper is utilized and to prevent chattering, saturation functions are invoked. The gravity gradient as a disturbance is applied. The sliding approach is applied to the SSETI/ESEO...
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.