B.V. Omidiji, H.A. Owolabi, D.A. Adetan
The greater number of castings produced globally are made by using sand casting techniques that utilize sand as major moulding material. This paper characterizes Isasa River sand based on its physical and chemical properties with the aid of Tandem pelletron electrostatic accelerator, trinocular microscope, mechanical sieve shaker, and box furnace, for Foundry application. Results obtained revealed that the River sand has moisture content of 4.30%, clay content of 2.22%, grain fineness number (GFN) of 49, Silica (SiO2) content of 93%, and sintering point of 1400oC. The River sand is a 4-screen sand, having angular grains with medium sphericity. Isasa River sand will be suitable for casting of gray iron and non-ferrous metals, with the addition of binding agent in suitable proportion.
Hyunji Kim, Youngju Kim, Namsub Woo, Sangmok Han, Sunchul Huh
Subsea separation is an attractive and economic solution to develop deep offshore fields producing fluid without hydrate or wax. The subsea separation system should be reliable to ensure successful operation in a wide range of multiphase flow regime, without need for developments. A subsea separator can avoid or simplifying costly surface platforms of floating vessels, as well as being an efficient tool to enhance hydrocarbon production. One solution of interest is the separation and re-injection of water at the seabed to avoid bringing the water up to the surface facility. In this study, multiphase flow characteristics inside in-line type subsea separation system are investigated for the design of subsea separation system. The separation efficiency of the subsea separator is determined through experiments that are the liquid-gas phased separation. Also internal swirl element (ISE) modelling of the separator was optimized. The analysis results were utilized to improve the reliability and efficiency of the subsea separation system.
Nadeem Fayaz Lone, Amanullah Mahmood, Arbaz Ashraf, Md Masroor Alam, Homi Hussain, Soumyashri Basu
Dissimilar Friction Stir Welded T-joints gives auxiliary strength to engineering structures, keeping insignificant body weight. Due to the stronger material being away from the heat source, the T-joint between AA8011 and AA5754 is very vulnerable to formation of defects which results in lower tensile strength along the skin and stringer. In this paper, two aluminium alloys, namely AA5754 and AA8011 were friction stir welded in the Tjoint configuration, and the roles of welding parameters such as the tool transverse speed, tool rotational speed, and tool shoulder diameter on the tensile strength along skin and stringer was analyzed and discussed. The relative importance of the three process parameters was also analyzed. The tool shoulder diameter is found to be the most dominant factor for the strength along the skin, whereas, tool transverse speed is found to be the most important for the strength along stringer.
Rajesh Kumar Singh, S. Ilavarasu
Integration of the Electronics modules in the rack system has been very challenging and critical in nature. The functionality of the electronics module is of prime importance for the operation on any system or subsystem. In many cases where these electronics systems housed in a rack system which in turn mounted in aircraft fuselage make functioning of the system more severe. This paper deals with design optimization of frame of rack structure in line with increasing demand of more robust and light structure with features of high stiffness and structural integrity. Aerospace industries employ topology , size and shape optimization technique and have reported significant structural performance gains as a result ,This report deals with the topology optimization of frame of rack structure has been performed using OptiStruct software. The main objective is to find the optimal topology of frame of the rack. The rack structure has undergone the first level of optimization, in other word it is called finite element analysis with inertia loading condition which presents the stress contour with varying stress level, the stress contour highlight the maximum and minimum stress level in the structure which gives the first level of information about the material requirement within the structure. Topology optimization being the part of the structural optimization is the extended domain of the structural analysis where optimum placement of the material in the design space is the prime focus. The design space is a geometrical space where material alteration is effected to achieve the design objective. Topology optimization problems utilize the firmest mathematical basis, to account for improved weight-to-stiffness ratio and perceived aesthetic appeal of specific structural forms, enabling the Solid Isotropic Material with Penalization (SIMP) technique. Structural topology optimization is a technique for finding the optimum number, location and shape of opening with in the given design space of the rack structure to the series of loads and the boundary conditions. A range of topology of rack frame is obtained by setting varying the target volume fraction and an optimum topology of the frame is selected by satisfying stress to weight ratio requirement and manufacturing constraint.
Rahul S. Yadav, Balaji D. Kshirsagar, Kunal M. Nawasagare
A centralized lubrication system is a system that delivers controlled amounts of lubricant to multiple locations on a machine while the machine is operating .The advantages of this new technology are clear although the heart of the automated lubrication system is the pump. The conventional pumps used are of fixed displacement type, thus the volume flow cannot be controlled hence they are not useful for the ALS. The Proposed precision control variable displacement pump is an innovative kinematic link base stroke changing mechanism that is controlled using an floating eccentric mechanism that can precisely vary the stroke of the mechanism and thus the pumping unit volume flow rate can be controlled. Project aims at development of the kinematic linkage for above said purpose. The analysis of the kinematic linkage parts will be done using ANSYS workbench 16.0, whereas the actual model that will be developed will be tested to determine the life cycle performance characteristics of the pump. The pump will be tested for fixed input speed and for multiple control positions.
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