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B Bhattacharyya - One of the best experts on this subject based on the ideXlab platform.

  • experimentation and analysis into micro hole machining of ti 6al 4v by micro edm using boron carbide powder mixed de ionized water
    International Journal of Manufacturing Materials and Mechanical Engineering, 2014
    Co-Authors: G Kibria, I Shivakoti, B Bhattacharyya
    Abstract:

    In micro-electrical discharge machining (micro-EDM), dielectric plays a significant role during the machining process as different types of dielectrics encounters different chemical compositions, cooling rates and dielectric strengths. Therefore, while employing these different dielectrics, dissimilar process responses are accounted when machining in EDM at micron level. The present paper investigates micro-EDM characteristics such as material removal rate (MRR), tool wear rate (TWR), overcut (OC), taperness and machining time (MT) during micro-machining of through holes on Ti-6Al-4V superalloy employing de-ionized water based dielectric other than conventional hydro-carbon oil i.e. kerosene. The paper also includes the comparative study of the micro-EDM machining characteristics employing boron carbide (B4C) powder as additive in de-ionized water dielectric at different discharge energies. The results show that MRR and taper of micro-hole are better and TWR is less employing B4C additive in the dielectric than pure one, i.e. the productivity is improved and same micro-tool can be used for machining an array of micro-holes. Surface topography and recast layer formed during micro-hole machining by micro-EDM has also been investigated based on optical and SEM micrographs. Energy dispersive spectroscopy (EDS) analysis of machined surface as well as tool electrode surface has been done and the results show that there is significant amount of infusion of tungsten element onto the machined surface. A significant amount of carbon element is found onto the tool electrode surface.

  • experimentation and analysis into micro hole machining in edm on ti 6al 4v alloy using boron carbide powder mixed de ionized water
    2012
    Co-Authors: G Kibria, B B Pradhan, B Bhattacharyya
    Abstract:

    In micro-electrical discharge machining (micro-EDM), dielectric plays a significant role during the machining process as different types of dielectrics have different chemical compositions, cooling rates and dielectric strengths. For this, dissimilar process responses are accounted when machining in EDM at micron level. The present paper investigates micro-EDM characteristics such as material removal rate (MRR), tool wear rate (TWR), overcut (OC), taperness and machining time (MT) during micro-machining of through holes on Ti-6Al-4V superalloy employing de-ionized water based dielectric other than conventional hydro-carbon oil i.e. kerosene. The paper also includes the comparative study of the micro-EDM machining characteristics employing boron carbide (B 4 C) powder as additive in de- ionized water dielectric at different discharge energies. The results shows that MRR and taperness of micro-hole is improved and TWR is reduced employing B 4 C powder than pure dielectric. Surface topography and recast layer formed during micro-hole machining by micro-EDM has also been investigated based on optical and SEM micrographs.

G Kibria - One of the best experts on this subject based on the ideXlab platform.

  • experimentation and analysis into micro hole machining of ti 6al 4v by micro edm using boron carbide powder mixed de ionized water
    International Journal of Manufacturing Materials and Mechanical Engineering, 2014
    Co-Authors: G Kibria, I Shivakoti, B Bhattacharyya
    Abstract:

    In micro-electrical discharge machining (micro-EDM), dielectric plays a significant role during the machining process as different types of dielectrics encounters different chemical compositions, cooling rates and dielectric strengths. Therefore, while employing these different dielectrics, dissimilar process responses are accounted when machining in EDM at micron level. The present paper investigates micro-EDM characteristics such as material removal rate (MRR), tool wear rate (TWR), overcut (OC), taperness and machining time (MT) during micro-machining of through holes on Ti-6Al-4V superalloy employing de-ionized water based dielectric other than conventional hydro-carbon oil i.e. kerosene. The paper also includes the comparative study of the micro-EDM machining characteristics employing boron carbide (B4C) powder as additive in de-ionized water dielectric at different discharge energies. The results show that MRR and taper of micro-hole are better and TWR is less employing B4C additive in the dielectric than pure one, i.e. the productivity is improved and same micro-tool can be used for machining an array of micro-holes. Surface topography and recast layer formed during micro-hole machining by micro-EDM has also been investigated based on optical and SEM micrographs. Energy dispersive spectroscopy (EDS) analysis of machined surface as well as tool electrode surface has been done and the results show that there is significant amount of infusion of tungsten element onto the machined surface. A significant amount of carbon element is found onto the tool electrode surface.

  • experimentation and analysis into micro hole machining in edm on ti 6al 4v alloy using boron carbide powder mixed de ionized water
    2012
    Co-Authors: G Kibria, B B Pradhan, B Bhattacharyya
    Abstract:

    In micro-electrical discharge machining (micro-EDM), dielectric plays a significant role during the machining process as different types of dielectrics have different chemical compositions, cooling rates and dielectric strengths. For this, dissimilar process responses are accounted when machining in EDM at micron level. The present paper investigates micro-EDM characteristics such as material removal rate (MRR), tool wear rate (TWR), overcut (OC), taperness and machining time (MT) during micro-machining of through holes on Ti-6Al-4V superalloy employing de-ionized water based dielectric other than conventional hydro-carbon oil i.e. kerosene. The paper also includes the comparative study of the micro-EDM machining characteristics employing boron carbide (B 4 C) powder as additive in de- ionized water dielectric at different discharge energies. The results shows that MRR and taperness of micro-hole is improved and TWR is reduced employing B 4 C powder than pure dielectric. Surface topography and recast layer formed during micro-hole machining by micro-EDM has also been investigated based on optical and SEM micrographs.

D P Kothari - One of the best experts on this subject based on the ideXlab platform.

  • a novel technique proposed for automatic control of small hydro power plants
    International Journal of Global Energy Issues, 2005
    Co-Authors: Himani Goyal, T S Bhatti, D P Kothari
    Abstract:

    A new scheme is proposed for the speed control of hydro turbines. Power can be controlled by controlling the rotary motion of the spear valve or linear motion of the sluice gate. In this paper, necessity for speed control, various function of governors, types, speed regulation of Micro-Hydroelectric power plants, functional block diagram of power generation and control system general models for speed-governing systems for hydro systems, conventional governors used, various block diagram of a hydro turbine speed control system are discussed along with derivation of hydraulic turbine transfer function. A new model is proposed model for controlling the flow by controlling the rotary motion of the spear valve or linear motion of the sluice gate by using servomotor and using the principle of servomechanisms. Then general function of the servomotor and different types of feedback control systems are also discussed. An analogy of the conventional system is given with the proposed system using the principle of Type 0 servomechanism. This scheme will provide complete control of the generation and thereby maintain the frequency of the system at the desired level.

  • bibliography on the application of induction generators in nonconventional energy systems
    IEEE Transactions on Energy Conversion, 2003
    Co-Authors: R C Bansal, T S Bhatti, D P Kothari
    Abstract:

    Induction generators are increasingly being used in nonconventional energy systems such as wind, mini/Micro-Hydro, biogas, etc. The advantages of using an induction generator instead of synchronous generator are well known. Some of them are reduced unit cost and size, ruggedness, absence of separate DC source, ease of maintenance, self-protection against severe overloads and short circuits, etc. An attempt is made in this paper to present an exhaustive bibliography on the application of induction generators in nonconventional energy systems.

S Ashok - One of the best experts on this subject based on the ideXlab platform.

  • optimised model for community based hybrid energy system
    Renewable Energy, 2007
    Co-Authors: S Ashok
    Abstract:

    Abstract Hybrid energy system is an excellent solution for electrification of remote rural areas where the grid extension is difficult and not economical. Such system incorporates a combination of one or several renewable energy sources such as solar photovoltaic, wind energy, Micro-Hydro and may be conventional generators for backup. This paper discusses different system components of hybrid energy system and develops a general model to find an optimal combination of energy components for a typical rural community minimizing the life cycle cost. The developed model will help in sizing hybrid energy system hardware and in selecting the operating options. Micro-Hydro-wind systems are found to be the optimal combination for the electrification of the rural villages in Western Ghats (Kerala) India, based on the case study. The optimal operation shows a unit cost of Rs. 6.5/kW h with the selected hybrid energy system with 100% renewable energy contribution eliminating the need for conventional diesel generator.

  • optimised model for community based hybrid energy system
    Renewable Energy, 2007
    Co-Authors: S Ashok
    Abstract:

    Hybrid energy system is an excellent solution for electrification of remote rural areas where the grid extension is difficult and not economical. Such system incorporates a combination of one or several renewable energy sources such as solar photovoltaic, wind energy, Micro-Hydro and may be conventional generators for backup. This paper discusses different system components of hybrid energy system and develops a general model to find an optimal combination of energy components for a typical rural community minimizing the life cycle cost.

Robinson Figueiredo De Camargo - One of the best experts on this subject based on the ideXlab platform.

  • proportional resonant control applied on voltage regulation of standalone seig for micro hydro power generation
    Iet Renewable Power Generation, 2017
    Co-Authors: Celso Becker Tischer, Jonas Roberto Tibola, Lucas Giuliani Scherer, Robinson Figueiredo De Camargo
    Abstract:

    This study deals with the development of a proportional-resonant (PR) control applied on voltage regulation and harmonics compensation of a standalone self-excited induction generator (SEIG) for Micro-Hydro power generation system. The generation system considers: (i) a three-phase induction generator (IG) as SEIG, (ii) which is driven by an unregulated Micro-Hydro turbine, (iii) a three-phase three-legs distribution static synchronous compensator (DSTATCOM) and (iv) linear and non-linear loads connected to the AC bus. The voltage regulation is performed through the injection of reactive power to the AC bus through the DSTATCOM, providing excitation current to the IG. It is considered the employment of PR control techniques, which offers suitable voltage regulation through voltage harmonics compensation in the point of common coupling. Furthermore, frequency regulation is performed on the demand side by an electronic load control connected to the DC bus of the DSTATCOM. Experimental results were obtained to demonstrate the good performance of the voltage and frequency regulation, provided by the control system during transients of linear and non-linear loads.