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This paper deals with an experimental verification of full bridge resonant inverter fed induction heating system. The switches operate in soft commutation mode and serves as a high frequency generator. The operating frequency is automatically adjusted to maintain a small constant lagging phase angle under load parameter variation. The output power is controlled using the asymmetrical voltage cancellation...
Friction welding is widely used as a mass production method in various industries. In friction welding, the joints are formed in the solid state by utilizing the heat generated by friction. Friction welding can be used to join different types of ferrous metals and non-ferrous metals that cannot be welded by traditional welding processes. The process parameters such s friction pressure, forging pressure...
CSTR plays a vital role in almost all the chemical reactions and is a highly nonlinear system exhibiting stable as well as unstable steady states. The variables which characterize the quality of the final product in CSTR are often difficult to measure in real-time and cannot be directly measured using the feedback configuration [1]. So, a virtual feedback control is implemented to control the state...
Energy is very essential for sustenance of life on this earth, without energy, life will come to a stands still. Perhaps after food, energy is the most important component for economic development of a country and for improving the quality of life of the people. Therefore, one of the most important tasks of the planning process is to ensure sharp increase in production of energy. In fact, the per...
In this paper, we present an efficient Monte Carlo model to calculate the time response for GaAs MSM photodetector. Our model includes two valleys and two bands for electrons and holes respectively. We simulate optical pulse absorption and trajectory of carriers to calculate electron and hole currents. Also, we calculate the effect of different voltages and optical pulses on external photocurrent...
Explosive cladding is a solid state welding process in which the joining of two metals is accomplished by the application of the pressure released by explosive detonation. This study focuses on the estimation of collision conditions in explosive cladding of Aluminium-Steel and Copper- Steel dissimilar metals. Analytical and numerical approaches were attempted to determine the temperature and pressure...
In this paper we design a fuzzy logic controller (FLC) for a cross flow shell and tube heat exchanger system. The purpose of this controller is to maintain a uniform temperature at the output (tube end) of the heat exchanger system, there by varying the input flow rate for a specified range. The control action taken by the FLC is based on the deviation from set point i.e. error (e) and rate of change...
Concrete is a mixture of cement, fine and coarse aggregates, in which aggregates occupy the major volume. Also, the strength of concrete varies with the type of aggregate used. In Recent days, the scarcity of aggregates due to the massive development in infrastructure field made the researchers think about an alternate source of concrete materials. Economical and environment friendly way is to consider...
The objective of this paper is to develop a Model Predictive Control (MPC) for a Shell and Tube Heat Exchanger. Since the heat exchanger is a highly non linear system, the operating zone of the system is divided into different zones. For each zone, a model is developed. Even though PID controllers are widely used for the control of heat exchangers, there is still a need for optimizing and conservation...
In this paper, we describe an online dimension reduction of feature vector of metal oxide semiconductor (MOS) based electronic nose, operated in static temperature measurement for identification of gas. The sample space of gas consists of eight chemicals. We have used twelve number of MOS gas sensors, manufactured by Figaro sensors, Japan. The response of the sensors to the volatile organic compounds...
Jet impingement is an effective means of localized heating or cooling. In many engineering and industrial applications, this process is used to get high heat flux. The present work deals with the studies of heat transfer characteristics of a single round impingement jet cooling on a flat surface with spent air exhaust ports on the jet plate. The experiments were performed to study the effect of the...
Silicon carbide powder (SiCp) was milled in a high energy ball mill in 300 rpm for 8 hrs. The wet milling media was tungsten balls (WC) in chemical compound Toluene (C6H6-CH3).The milled powder then characterized by Atomic Force Microscope (AFM) to study topography and particle size analyzer.
Decisive purpose of transformer oil is to provide effective insulation and cooling to ensure satisfactory performance of the transformer. In practical operation, the transformer experience several stress evolving conditions due to combined thermal and electrical stresses. Both thermal and electrical stresses lead to degradation of oil performance interms of poor dielectric strength and ineffective...
Automotive companies have turned their concentration towards the fuel cell powered hybrid vehicle research, since it offers reduced emission and also saves our nature. The fuel economy is also considerably improved due to the plenty of source availability. The core technology behind such development of fuel cell for automotive applications is the “Power electronics”. The Power electronics influence...
An experimental study was conducted on a laboratory scale humidity system to obtain the empirical model (process). A pseudo random sequence was introduced for the obtained model to get the input and output data. Different models such as autoregressive exogenous input model (ARX), non linear ARX and a feed forward neural network (FNB) model using back propagation algorithm were tried in MATLAB environment...
Magnetron and other microwave amplifiers and oscillator are very useful in generating high power at high microwave frequencies. However they all suffer loss of efficiency and performance. This occurs due to back heating electrons and standing waves in magnetron and TWT amplifiers respectively. This paper sujjegsts a hypothetical method of reducing destructive effects in these devices with the phase...
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