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Volume 4 ~ Issue 3 (March 2014)
The Methods of Solution for Constrained Nonlinear Programming
Paper Index :: :07.4721/043001006
We shall be concerned with the problem of determining a solution of constrained nonlinear
programming problems. The approach here is to replace a constrained problem with one that is unconstrained.
The reduced problem is then solved using an iterative technique – "Barrier Function Method" and "Quadratic
Penalty Function Method".
Key words: Barrier function Method, Quadratic Penalty Function Method", Interior Point, Equality
Constraints, Objective function, Feasible Solutions, Lagrangian-penalty function method.
New results on Occasionally Weakly Compatible Mappingsand Fixed point Theorem in Fuzzy Metric Spaces Satisfying Integral Type Inequality
Paper Index :: :07.4721/043007014
Abstract: The aim of this paper is to present some new common fixed point theorem in fuzzy metric spaces for occasionally weakly compatible mappings with integral type inequality by reducing its minimum value.
Keywords: Fuzzy metric space, occasionally weakly compatible (owc) mappings, common fixed point.
Improved Step down Conversion in Interleaved Buck Converter and Low Switching Losses
Paper Index :: :07.4721/043015024
This project is presented by a soft-switching techniques interleaved buck converter. And it's having order to guarantee small switching losses and, consequently, a high efficiency, a non-dissipative soft-switching cell with auxiliary commutation circuit is used. But in this topology we expected a large step up voltage, low switching stress, small switching losses, and high efficiency. Because of that we proposed IBC that since the voltage stress across all the active switches is half of the input voltage before turn-on or after turn-off when the operating duty is below 50%, the capacitive discharging and switching losses can be reduced considerably. This allows the proposed IBC to have higher efficiency and operate with higher switching frequency. In that additionally, the proposed IBC has a higher step-down conversion ratio and a smaller output current ripple compared with a conventional IBC. The features, operation principles, and relevant analysis results of the proposed IBC are presented in this project. The validity of this study is confirmed by the experimental results of prototype converters with 150–200 V input, 24 V/10 A output.
Key words—Buck converter, interleaved, low switching loss
Studies on Mass Multiplication of Glomus Moseae [Arbuscular Mycorrizhal Fungus] For Phosphofert Bio-Fertilizer Production, It's Efficacy on Phosphatic Fertilizer Savings And Productivity in High Yielding Mulberry Garden under West Bengal Conditions
Paper Index :: :07.4721/043025035
Mulberry is cultivated by farmers for its leaves, the sole food for silkworm (Bombyx mori L.) for commercial production of raw silk in Sericulture Industry. As mulberry is a perennial crop can be maintained for several years in the field, selection of suitable land and follow-up of recommended package of practices are inevitable for maintenance of potential productivity of the variety selected for cultivation. As the quality of mulberry leaves alone contributes about 38.2% for the success of silkworm cocoon crop, quality linked leaf productivity of mulberry leaves can be achieved through adequate supply of all required input into soil. Phosphorus is one of the important macronutrient required in larger quantity next to Nitrogen for mulberry. In order to reduce the high cost involved towards nitrogenous chemical fertilizers and to maintain the soil health in an eco-friendly way Integrated Nutrient Management (INM) approach in agriculture sector became popular and the same has been followed in mulberry cultivation as well in recent years. Use of different kinds of microbial inoculants as bio-fertilizer to fix atmospheric nitrogen in mulberry garden brought improvements in soil health maintenance and helps to reduce nitrogenous chemical fertilizer requirements and expenditure to farmers considerably without affecting the quality linked productivity...
Keywords: Mulberry leaf, AMF; bio-fertilizer, eco-friendly soil health, potential productivity.
Roll Attitude Control of a Space Vehicle
Paper Index :: :07.4721/043036045
Guided missiles are space-vehicles carrying war-heads. Three attitudes- the roll, pitch and yaw have to be continuously controlled in a space flight. This is done by using automatic control systems. The design procedure for roll attitude control of a guided missile is the subject of the paper. This is extremely important for following proper trajectory and hitting the target. Two designs have been advanced. In the first design, there is no constraint on velocity error. The design has been optimized by simultaneous variation of forward path gain and the rate feedback. In the second design, the velocity error has been specified. It has been optimized by simultaneous variation of the rate feedback and the parameters of a lead compensator.
Keywords - Rocket, Guided missile, Roll attitude control, Overshoot, Phase margin, Gain margin
The Genetic Algorithm in finding the maxima of single-variable functions
Paper Index :: :07.4721/043046054
The aim of this paper is to present an application of genetic algorithms in finding the single variable functions' maxima, which is being tested on complex, multi-modal, non-differentiable and not continues functions. Genetic algorithm using binary presentation of solutions, ranking selection and elitist selection, as well as one point crossover and mutation for each bit, in fact concludes that if the function has only a maximum all strings will converge to that value, but if the function is sufficient complex could not be located a maximum in a reasonable number of generations, but can find a value that is good enough.
Keywords - Genetic algorithms, maxima, multimodal function, solution, stochastic sampling
Lumped-parameter analytical methodology for evaluation of adaptive seat damper to enhance rotorcraft crash safety
Paper Index :: : 07.4721/043055064
This research study focuses on the analytical evaluation of magneto-rheological (MR) dampers for enhanced occupant protection during vertical crash landings of a helicopter. The current state-of-the-art helicopter crew seat has passive safety mechanisms that are highly limited in their capability to optimally adapt to each type of crash scenario due to variations in both occupant weight and crash severity level. While passive crash energy absorbers work well for a single design condition (50th percentile male occupant and fixed crash severity level), they do not offer adequate protection across a broad spectrum of crash conditions by minimizing the load transmitted to the occupant. This study reports the development of a lumped-parameter human body model including lower leg in a seated posture for rotorcraft crash injury simulation. For implementing control, a control algorithm was made to work with the multi-body dynamic model by running co-simulation. The injury criteria and tolerance levels for the biomechanical effects are discussed for each of the identified vulnerable body regions, such as the thoracic lumbar loads for different sized adults. The desired objective of this analytical model development is to develop a tool to study the performance of adaptive semi-active magnetorheological seat suspensions for rotorcraft occupant protection.
Keywords - Rotorcraft crash safety, seat energy absorber, magnetorheological energy absorber, crash injury evaluation.