December 2020 Vol 9 No 2
Author (s) : DOI : 10.32692/IJDI-ERET/9.2.2020.2001
1). Jigar Vaghela, Darshan Institute of Engineering & Technology, Rajkot, Gujarat, India
2). Reena Trivedi, Nirma University, Ahmedabad, Gujarat, India
3). Vijay Zala, Jyoti CNC Automation Ltd, Rajkot, Gujarat, India
This paper deals with the design and development of a moveable column Vertical Machining Centre. In the current scenario, most of the Vertical Machining Centers have a stationary column. It is a need for industries to develop VMC machines with movable column. The present work proposes the conceptual design of headstock and column of VMC machines with the movable column as the conventional VMC machines with fix column has certain issues like maintenance problem, work proficiency, smaller working span, bulky construction, etc. The objective of this paper is to create the best possible design of movable column and headstock of the VMC machine such that higher stiffness can be achieved. It is done by carrying out structural analysis and by applying various optimization techniques like shape, size, and mass optimization. A model of the headstock of the movable column VMC is presented. The headstock and column are designed using the reference of an in-house developed machine. The stiffness values, deformation values, stress values, frequency response at any point of the body can be determined. The shape and size are optimized without negotiating the allowable stiffness values of the structure. Mass is optimized insignificant amount keeping deformation in permissible values.
Author (s) : DOI : 10.32692/IJDI-ERET/9.2.2020.2002
1). R. Bhima Rao, CSIR-Institute of Minerals and Materials Technology, Bhubaneswar, Odisha, India
2). Y. Lokeswara Reddy, CSIR-Institute of Minerals and Materials Technology, Bhubaneswar, Odisha, India
Archeological evidence indicates that the gravity concentration commenced before introducing the metallurgy technology. Nature comminutes the rock into individual liberated particles by weathering processes and transport them to downslope through geological agencies such as rivers, wind, and glaciers. During this process, the morphology of the Earth's crust changes and exhibits a distinctive topography - representing a model of a gravity unit and a process of concentration of heavy minerals by geomorphic agencies similar to the gravity concentration mechanism at industries. In this paper, the gravity concentration by nature and by industrial practices are compared and discussed.
Author (s) : DOI : 10.32692/IJDI-ERET/9.2.2020.2003
1). Rikinkumar B. Patel, CHARUSAT UNIVERSITY, Changa, Gujarat, India
2). Mihir R. Patel, Chandubhai S. Patel Institute of Technology, CHARUSAT- Charotar University of Science & Technology, Changa, Gujarat, India
3). Nilaykumar A. Patel, CSPIT-CHARUSAT UNIVERSITY, Changa, Gujarat, India
The rapid growth of solar power (plant) installation in various countries can be beneficial to environment, but at the same time the interconnected solar panels to power grids can negatively impact the stability of power system. So, to maintain the stability of power system the accurate solar power generation forecasting is becomes essential. In this paper, we have applied three well-known time series models called Auto-regressive (AR), Auto-regressive Integrated Moving Average (ARIMA) and Seasonal Auto-regressive Integrated Moving Average (SARIMA) model for forecasting the solar based electrical power generation. Using this time series models the two different case studies are carried out i.e. the first case study will show the analysis for Elia dataset and the second case study will show the analysis for Sheffield solar dataset. In both the case studies one day ahead prediction is made and also, the predicted values are compared with real time measured values to test the effectiveness of applied time series model. The Mean Absolute Percentage Error (MAPE) and Root Mean Squared Error (RMSE) techniques are used to calculate the accuracy of applied time series models.
Author (s) : DOI : 10.32692/IJDI-ERET/9.2.2020.2004
1). S. I. Sarsam, Sarsam and Associates Consult Bureau (SACB), Baghdad, Baghdad, IRAQ
Asphalt concrete mixture usually suffer permanent deformation under load repetitions and hot climate condition. Research work is going on globally to implement additives in the binder production process or through the preparation of asphalt concrete mixture. In the present investigation, an attempt has been made for the inclusion of three types of additives namely (crumb rubber powder, fumed silica, and Phosphogypsum) into the asphalt cement binder using two types of penetration grade asphalt cement (40-50) and (60-70). Asphalt concrete mixtures were prepared, Marshall specimens have been constructed and tested under repeated indirect tensile stresses with the aid of Pneumatic Repeated Load System PRLS. The influence of such additives on the permanent deformation at 40 °C environment was monitored through continuous video capture. It was concluded that the temperature susceptibility of the binder in terms of PI increases after digestion with fumed silica and Phosphogypsum while it decreases after the addition of crumb rubber. The rate of deformation decreases by (25 and 30) % by implication of rubber and Phosphogypsum additives respectively for (40-50) grade binder. However, the rate of deformation declines by (15, 3 and 21) % for (60-70) binder by implication of rubber, fumed silica, and Phosphogypsum additives respectively.
Author (s) : DOI : 10.32692/IJDI-ERET/9.1.2020.2003
1). R. S. Fono-Tamo, Papua New Guinea University of Technology, Lae, Morobe, Papua New Guinea
Surfaces of magnesium metal composites (MMC) with fly ash (FA) particles embedment processed through friction stir processing (FSP) was subjected to friction and roughness test. The friction stir processing development was done with 3 passes at 1200 rpm. The investigation was conducted via a profilometer dotted with a diamond stylus at a speed of 0.2 mm/s for the surface roughness test. The sliding friction test was carried out using a pin-on-disk tribometer under varying load condition. The coefficient of friction (COF) was investigated under 1 and 10 N loads at a constant speed at 70% humidity. A digital Vickers Hardness tester helped find the hardness at various locations of the processed surface. The determined surface roughness parameters are Ra = 3.21µm, Rz = 18.47 µm and Rmax = 22.45µm. There is a regular increase in hardness from the beginning to the end of the process with average values as 69.34, 71.44 and 74.03 for the beginning, middle and end of the work piece respectively. The coefficient of friction varies considerably with the applied load. For each load, there is a fluctuation at the early stage of the experiment before a seeming stability of the coefficient of friction is observed. The derived COF are 0.82925 and 0.27459 for 1 and 10 N loads respectively. It is shown that including fly ash particles into magnesium substrate affects the initial structure of the based metal.
International Journal of Darshan Institute on Engineering Research and Emerging Technologies (IJDI-ERET) (ISSN 2320-7590) is an open access peer-reviewed international journal publishing high-quality articles related to all domains of engineering.