Diagnosis of Air-Gap Eccentricity Fault for Inverter Driven Induction Motor Drives in the Transient Condition
Modelling and Simulation Study of a Helicopter with an External Slung Load System
Comparative Study of Single Phase Power Inverters Based on Efficiency and Harmonic Analysis
Trichotomous Exploratory Data Analysis [Tri–EDA]: A Post Hoc Visual Statistical Cumulative Data Analysis Instrument Designed to Present the Outcomes of Trichotomous Investigative Models
LabVIEW Based Design and Analysis of Fuzzy Logic, Sliding Mode and PID Controllers for Level Control in Split Range Plant
Today the expanding use of power inverters in the power electronics industry has increased the importance of applied inverter choosing with respect to the harmonic content and efficiency. Especially, harmonics are playing the most important role because sensitive electronic devices can be operated only with the clean power generated inverters. In this paper, comparative analysis of single phase power inverters regarding their output waveforms was performed. Square wave, modified square wave and true sine wave inverter circuits with 500W rated power were designed and analyzed using Proteus Professional spice program. This comparison was fulfilled in accordance with the circuit configuration, THD (Total Harmonic Distortion) and output efficiency. After simulation results, these inverter circuits were realized on PCB (Printed Circuit Board). The efficiency of the inverters was calculated using Extech true RMS (Root Mean Square) digital multimeter and THD values were measured using Fluke 435 Power Analyzer device. According to the experimental results, the finished true sine wave inverter circuit with about 7% THD and an efficiency of 80% has the most ideal output signal compared to the modified and square wave inverter circuits. To get a resembled sine wave, a low pass filter was designed and applied at the output of the true sine wave inverter circuit. With the help of this filter circuit, the harmonic content was reduced. Tests on resistive and inductive loads were carried out under laboratory conditions and output signals were observed using Tektronix digital storage oscilloscope. Test results and simulation outcomes were confirmed to each other.
This study develops a methodology for the review of aero-structural design, including consideration of the starting of a small wind turbine blade. To design a fast-starting blade, the major concern is to make sure that the blade allowable stress is within the safe limits. The literature is studied and the blade element momentum theory and the simple beam theory were employed to compute the stress and deflection along the blade. The feasibility of the solution is also looked while considering the ease in manufacturing as well as other concerns that arise while installing such sources of power generation. The authors have aimed to find solution for the remote villages which are not connected to any power grid can receive power, so as to ensure lighting in their homes. The power output of 75 W at an average wind speed of 4.5 m/s has been targeted. The authors have also aimed to provide electricity to the rural area in India, which amounts to 25000 in number where there is no provision for electricity. This solution may provide the electricity needs of such villages.
Time taken by the hospital authority to understand the condition of the patient is crucial in saving a patient's life. So need for tracking the patient's health conditions such as Heart rate, body temperature, Blood Pressure (BP), ECG signal, fatigue, air lung volume and vital-signs like patient physical appearance are sent to the hospital. All these parameters are monitored in the hospital, and also can be accessed by Doctors from anywhere. The system will allow emergency room doctors to get a real-time overview of patient's condition prior to their arrival at the hospital. This will help them to be prepared in advance to treat the patients once they arrive. This also helps them in proper intervention and intensive patient monitoring accordingly. In this paper, a real-time patient monitoring system in the ambulance while in transit is designed to transmit all the above patient vital parameters to the Hospital and the Doctor. The algorithms were also implemented to detect the abnormalities in these parameters. The system is implemented using LabVIEW real-time environment and Bio-sensors are interfaced through signal conditioning circuit to NI USB – 6281. This paper is a part of real time project funded by UGC India.
Many systems that arise in practice are complex in nature and of a higher-order. The mathematical procedures of modeling such systems lead to a comprehensive description of the process in the form of complex, higher-order transfer functions or state-space models. This complexity often makes it difficult to obtain a good understanding of the behavior of the system. Therefore, higher-order models are difficult to use for simulation, analysis or controller synthesis, and it is not only desirable, but often necessary to obtain satisfactory reduced-order representations of such higher-order models. The main objective of model order reduction is to obtain a reduced-order approximate of a complex higher-order system that retains and reflects the important characteristics of the original system as closely as possible.
Among all the renewable energy sources, PV (Photovoltaic) solar energy is considered as the most auspicious inexhaustible resources. In recent years, due to acute energy crisis, the demand for renewable energy sources is high. Maximum Power Point Tracking (MPPT) for the solar energy is required as the power output of the solar system varies with variation in solar irradiance and temperature. So to extract peak power point from PV system, various MPPT algorithmic rule are utilized. In this paper, the authors have discussed various aspects of these algorithms. This paper presents, a literature survey of various MPPT algorithms in solar photovoltaic system.
The Model Predictive Control (MPC) technique determines the receding horizon control solution by minimizing the cost function, while satisfying the constraints. This paper presents a review on the MPC technology and its future advancements. The control strategy, used to find the solution of an optimal control problem within the constraint limits is described in this paper. The various factors and the models influencing the MPC solution for the optimal control problems are also explained. A vision of the next generation of MPC technology with more emphasis on potential business and research opportunities are presented in this paper.