Showing papers by "Shantanu Das published in 2014"
TL;DR: This is the first attempt to design such fractional Butterworth filters in complex w-plane instead of complex s-plane, as conventionally done for integer order filters, and the concept of fractional derivatives and w-planes stability of linear fractional order systems are discussed.
72 citations
TL;DR: In this paper, the joining of stainless steel316 to stainless steel-316 in the bulk form has been carried out by placing stainless steel 316 powder at the interface and through targeted heating using microwave hybrid heating.
65 citations
TL;DR: In this paper, the authors presented a method to drill a blind hole on perspex material at 2.45 GHz frequency of microwaves using a domestic applicator of 700 W maximum powers.
Abstract: The work presented in the paper shows a way to drill a blind hole on perspex material at 2.45 GHz frequency of microwaves using a domestic applicator of 700 W maximum powers. The approach was based on the approach was based on the application of a Litz wire coax as a monopole, to act like a drill bit with a heat source. The methodology involves no rotary but, single linear movement of tool inside a microwave applicator for drilling. A computer simulation on COMSOL for about 50 minute each run, was also used to show the heat distribution inside microwave applicator. The result of computer simulation helped to locate the optimized position of Litz wire inside the applicator for optimum heat generation. The experimental results show the feasibility of microwave drilling and limitations on perspex specimen in the used applicator. The work presented involves a new approach in the area of microwave drilling of materials on a customized domestic microwave setup.
10 citations
01 Jan 2014
TL;DR: In this paper, a series of experiment with different types of concentrator (steel, copper and nichrome) was carried out, and the performance of the process was evaluated in terms of the residue diameter, HAZ diameter and the hole diameter.
Abstract: The applications of microwaves in engineering has been fast expanding, one such area is micromachining and micro-fabrication. A series of experiment with different types of concentrator (steel, copper and nichrome) wascarried out. Different machining conditions like variable power, location and movement were considered. The drilled hole shows development of three differentheat affected zones (HAZs). The performance of the process was evaluated in term of the residue diameter, HAZ diameter and the hole diameter. Energy Dispersive Spectroscopy (EDS) and field emission scanning electron microscope (FESEM) were used to assess the zone and damage of the monopole concentrator used as drilling tool. The drill bit damage in its length was controlled with careful selection of process parameters. An optimum processing condition was determined experimentally, for minimum residue generation, minimum HAZ and minimum oversize of drilled holes. The depth of through hole in perspex material was maintained constant at 2 mm.
1 citations