|1||A Study On Strength And Stress Strain Behaviour Of Self Curing Concrete||1.Abdul Altaf, 2.K Praveen||
Curing cement is the process of retaining moisture in the concrete throughout its early stages, notably during the first 28 days after placement, in order to achieve the desired qualities. Relieving concrete has a significant role in the formation of the solid microstructure and pore structure. When compared to conventional cement, the goal of self-relieving is to reduce water dissipation from concrete and therefore increase the solid's water maintenance limit. Without a doubt, ill-advised restoration may degrade the quality of cement. It has been established that using water-dissolvable polymers as admixtures in solids has an influence on the qualitative features of solid relieving of cement. Solid relieving of cement plays a significant role in building up the solid small-scale structure, which improves its solidness and execution. As an inner restoring specialist, super absorbent polymer (SAP) is used.
SAP is a collection of polymeric materials that can soak up and absorb a lot of water from their surroundings while also holding the water in their structure without causing it to dissolve. In this study, M20, M30, and M40 self-restoring concrete assessments with blending SAP0.2, 0.40, 0.6, 0.80, and 1.0 rates were used in this study. When SAP is used in self-restoring concrete, the compressive strength is not compromised. When SAP is used in self-curing concrete, the split elasticity is not reduced. The SAP can be used on the bond weight up to 0.6 percent without compromising the distinct cement quality.
|2||Analysis Of Brushless DC Motor Drive Using Cascade H-Bridge Inverter Topology||1.Badisa Sreenu, 2.Jibilikapally Suman||
In this paper the output of a brushless DC motor drive supplied by a five-level inverter is analysed and explained. A cascaded H-Bridge inverter architecture was chosen for the research because of its many advantages. The simulation model of the brushless DC motor is produced using the brushless DC motor's mathematical model. The whole model of the inverter-fed drive is simulated in MATLAB/SIMULINK. Waveforms depict the inverter output voltage, engine torque, back EMF, and harmonic analysis of the inverter voltage. The output voltage of a five-level inverter is of excellent quality. When supplied by a five-level inverter, the efficiency of BLDC is high, according to the simulation study.
|3||Torque Ripple Reduction In BLDC Motor By A Novel Method||1.V Navya , 2.B Shankar||
Brushless DC motors are gaining a lot of popularity due to the several advantages of the motor. This motor has mainly attracted the designers of electric vehicle systems and other industrial applications. This motor is commercially obtaining demand due to its high torque density. Even though the magnitude of the torque is high in the BLDC motor, there are some problems still associated with its performance.
One of the significant drawbacks of the BLDC motor is the presence of ripples in the torque waveform. The drives, aerospace, and other machine tools require shallow ripples in torque waveform. This will decrease the average value of the torque obtained by the BLDC motor. This is a very challenging problem in the current research trends.
In this paper, the primary focus is on the torque ripple minimization in the BLDC motor using modern/novel techniques. The technique presented in this work will considerably reduce the ripples in the torque waveform of the BLDC motor. Entire work is done in the MATLAB/SIMULINK software. The mathematical model of the BLDC motor is used to analyze the torque ripples presented in the waveform. The simulation waveforms of the torque waveform are shown in the results.
|4||Experimental Evaluation Of M35 Grade Conventional Concrete By Supplementing Natural Fibers, Foundry Sand And Sea Sand As Partial Replacements||1.Shaik Mohammed Sohail, 2.Jugal Kishore||
Present urbanization required a huge variety of concretes and minimized effects of newly developed composite materials. This development leads to adverse effects on the surrounding environment. As a part of environmental concern, we have to minimize the negative effects. The use of fine aggregate in the construction industry is more. Therefore, the use of river sand can be replaced with other materials to protect the environment of the river as well as prevent erosion and flood, in My present research paper is similar to this, based on the recycling technique I used to do materials replacements of natural fibers and waste foundry sand & sea sand are the major partial replacements of fine aggregate and grade of concrete are M-35. After the preparation of M-35 Grade concrete, it should be validated with conventional concrete. The major tests are conducted on M-35 grade hardened concrete, which are Concrete cube tests, Cylinder Test & flexural tests. After the test results are verified with referenced documents and satisfactory results are obtained, the complete discussions and results are listed separately in further chapters.