Journal of Majlesi Journal of Mechatronic Systems
Volume:2 Issue: 2, Jun 2013

An intelligent optimization method for designing Fractional Order PID (FOPID) controller''s base Genetic Algorithm (GA) ear presented in this paper. Fractional calculus can provide novel and higher performance extension for FOPID controllers. However, the difficulties of designing FOPID controllers increase, because FOPID controllers append derivative order and integral order in comparison with traditional PID controllers. To design the parameters of FOPID controllers. Experimental results show the proposed design method can design effectively the parameters of FOPID controllers.

Robust rejection of severe load disturbance exerted on a DC servo drive using Adaptive PID (APID) control versus Model Reference Adaptive Control (MRAC) is discussed in this paper. Simulation results demonstrate the superior performance of the APID algorithm fulfilling the aim of this research compared to Lyapunov based model-referenced adaptive control (LMRAC) method. The achievements of this study show that the APID method is able to fully eliminate the severe load disturbance exerted to the motor demanding feasible amount of control energy. This remarkable privilege proposes it as an effective control strategy in precise servo drive speed or position control applications of the DC motors while imposed to harsh load disturbances especially when the saturation of the power supply or its ability to rapidly provide the high demanded control energy is a matter of concern.

In this paper a Four-Wheels-Drive (4WD) electric Vehicle (EV) controlled by Direct Torque Control DTC) is presented, where the electrical traction chain was well analyzed and studied from the nickel metal hydride (NIMH) battery, the buck boost to the mechanical load behavior. The speed of the four wheels is calculated independently during the turning with the electronic differential system computations which distributes torque and power to each inwheel motor according to the requirements, adapts the speed of each motor to the driving conditions. The basic idea of this work is to maintain the initial battery state of charge (SOC) equal to 70% and the prototype was tested in several topology conditions and under speed. Our electric vehicle direct torque control is simulated in MATLAB SIMULINK environment. 4WD Electric vehicle (EV) has demonstrated satisfactory results in all kind of roads constraints: straight, ramp, curved road and downhill. Results also indicate that this strategy can be successfully implemented into the traction drive of the modern 4WD electric vehicles.

The application of particle swarm optimization (PSO) in parameters design of a split-phase single-phase induction motor is proposed in this paper. The PSO considers the motor efficiency as objective function and five performance related items as constraints. The main advantages of the proposed technique are; its simple structure and its straightforward verification of maximum efficiency of induction motor for a given output power. The PSO algorithm was implemented on a test motor and therefore, a code has been provided under MATLAB software. The results show that the PSO method gives more suitable design optimization against conventional methods.

A wireless sensor network (WSN) consists of autonomous sensors which are spatially distributed, used to monitor physical or environmental conditions. Wireless Sensor Networks (WSNs) are typically constrained in energy and resource. Since in most WSN applications, the traffic pattern is sensor-to-sink, in-network data aggregation methods are employed in order for effectively utilizing available resources. In order to transfer the aggregated data packets reliably, data transport protocols are required which provide reliability at the packet level. The protocols which are currently used to provide reliable data transfer for sensor-to-sink traffic, either provide reliability at the event level or are not energy efficient. In order to achieve energy-efficiency, alongside with enhanced packet-level reliability, an energy-efficient reliable data transfer protocol is proposed here, which provides packet level reliability by extending the concept of monitors, and employing duty cycles, improves the energy-efficiency. This new protocol is tested in terms of performance, and experimental results show that the new protocol leads to significant improvement in packet delivery ratio and energy savings.

The main objective of the design of high tension (HT) increased safety (Ex e) motor is to prevent the arc/spark and control the temperature of any part of Ex ‘e’ HT motor which cannot act as source of ignition in the explosive atmospheres. The time tE is the time taken by motor windings to reach the limiting temperature of winding insulation which is very important for increased safety motor. The time tE of rotor or stator winding can be affected by increasing the mass of rotor winding of motor. The time tE is very critical for any HT Exe motor and it should be at least 5 seconds as per requirement of IS/IEC 60079-7:2006. A study has been conducted in this paper to discern the effect of increased mass of normal rotor winding on the time tE and the performance characteristic of motor. The Ex ‘e’ high tension induction motors mentioned in this paper have been manufactured by Bharat Heavy Electricals Ltd. (BHEL), Bhopal, India during the project as per the design and guidance of main author as project leader.