Advanced Materials Research Vols. 488-489

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https://doi.org/10.4028/www.scientific.net/AMR.488-489

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Paper Title Page

Trust Management for One-Hop Cluster-Based Underwater Wireless Sensor Networks

Authors: Yan Ping Cong, Zhi Qiang Wei, Guang Yang

Abstract: In this paper, we studied the trust management problem in one-hop cluster-based underwater wireless sensor networks (UWSNs). Trust plays an important role in constructing UWSNs. Due to the dynamic natures of UWSNs (current movement, addition or deletion of nodes) and the massive deployment of underwater sensor nodes, coupled with the short range of water acoustic communications, we need to ensure that all communicating nodes are trusted. We propose a hierarchical trust management scheme for one-hop cluster-based underwater wireless sensor networks.

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Quality Improvements by Implementing Lean Manufacturing Principles

Authors: S. Naveen, Ganesh Kumar Nithyanandam

Abstract: Nowadays, customers are well aware of quality and they purchase only quality products. Thanks to globalization! In order to achieve highest quality products, companies need to adapt the latest and advanced technologies in their industries. Failure to adapt these new trends would lead to less profit and or huge loss and eventually shutdown of their business to its competitors. A case study on discrete manufacturing company was conducted to analyze the above phenomenon. The selected case study company is pioneer in manufacturing plastic injection moulding machines in India. Several lean tools and techniques are implemented to eliminate its unwanted waste in their production line. All these aid to development of optimum facility layout, good workplace, ergonomic designed work cells for operators, improvement in productivity of the operator (by 28%), to name a few. By achieving all these, the overall product (plastic injection moulding machine) quality is improved by 23%.

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Flow Mechanism of a Novel Active Micro-Rotor Mixer

Authors: Y.C. Liou, J.M. Miao, T.L. Liu, S.J. Cheng

Abstract: The purpose of this study is to investigate the complex vortex flow patterns within a novel active micro-rotor mixer under various Reynolds numbers and rotating speeds by employing of CFD technique. The concept of present micro-rotor mixer is inspired from the Wankel-type combustor which is widely used in the power machines. The configuration of present micro-mixer is consisted of a rotor with shape of triangle column, a blending chamber and individual inlet and outlet ports. The blending chamber is served as the mixing chamber since the separated three sub-regions will change their volumes as the rotor undergoing the rotating motion with a fixed eccentricity. The dynamic flow patterns and mixing process of two species within the mixing chamber were simulated and visualized with streak lines. The governing equations are unsteady, two-dimensional incompressible Navier-Stokes equation and the two working fluids are pure water and alcohol. The concentration equation for species is also solved to reveal the mass transfer process in various sub-regions then being calculated on the outlet port to evaluate the mixing efficiency. The dynamic mesh technique was applied to re-distribute the computational meshes when the rotor finished a complete rotation cycle. Inspection on the flow developing stages within the mixing chamber over one complete cycle, it seems that multi-vortex flow field was generated due to the interaction of the shear force from the rotor, viscous force and inertial force of working fluids. The Coanda flow appeared in some conditions. When the Reynolds number is below of 10, the rotating speed of rotor has less influence on the mixing efficiency. An obvious enhancement in the mixing efficiency can be found in cases of the rotating speed of rotor changed from 30 rpm to 150 rpm when the Reynolds number in range of 25 to 100. Generally, the maximum mixing efficiency of 85% can be achieved for 1

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The Research of the Relationship of Cement Slurry Performance Development and Net Early Microscopic Structure

Authors: Tian Yang Zhai, Zhu Ding

Abstract: Use concrete pressure testing machine to test the properties of Cement slurry , and conduct the ASTMC1202 penetration test of the properties and MIP which test the properties and microstructure characteristics. Base on the analysis of the relationship of cement strength and permeability, microstructural features. The results show that, with the increase of the permeability of cement slurry net of intensity decreased by 13%; The increase of pore volume total 11%, and the average pore volume rose 5%, cause pore internal loose, strength fell 0.74%; Cement of a few aperture increase to 7 nm, can lead to internal form lots of pore channels, intensity decreased. when the most several aperture is more than 10 nm, cement strength average less than 41.4 Mpa; Age can effectively passivation cement phase crystallization geometrical shape, and effective crystallization refined grain size.

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3-D Modeling & Numerical Simulation of Friction Stir Welding Process

Authors: Barnik Saha Roy, Subhash Chandra Saha, John Deb Barma

Abstract: A 3D thermal pseudo mechanical model formulated in an Eulerian frame considering a quassisteady approach to Friction Stir welding modeling of AA6061 Aluminium alloy is proposed and implemented using nonlinear finite element code in Comsol Multiphysics v 4.1. The effect of different operating parameters on the temperature distribution was analyzed. The material flow is found to be enhanced with the increase in traverse speed and angular velocity of the pin with a pronounced swirl on the advancing side. The distribution of equivalent plastic strain and dynamic viscosity was found to correlate with the distribution of the microstructure zones in the weld.

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Process Parametric Optimization of Submerged Arc Welding by Using Utility Based Taguchi Concept

Authors: John Deb Barma, Joydeep Roy, S.C. Saha, B. Saha Roy

Abstract: Achieving optimal weld parameters with desired quality features is very difficult because these quality features are highly correlated. There are several control parameters which directly or indirectly affect the response parameters. In the present study, an attempt has been made to search an optimal parametric combination, capable of producing desired high quality joint in submerged arc weldment by Taguchi method coupled with Utility theory. In the present investigation three process variables viz. Wire feed rate (W_f), stick out (S_o) and traverse speed (T_r) have been considered and the response parameters are hardness, tensile strength (T_s), toughness (IS).

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Methodology for the Objectification of Decisions in the Product Development

Authors: Frank Nehuis, Kai Schmidtchen, Carsten Stechert, Sven Schulze, Thomas Vietor, Uwe Dombrowski

Abstract: In order to develop the best possible product enterprises have to consider multiple solutions during the product engineering process. In early phases of the product development process enterprises generally reduce the number of possible solutions by focusing only on a few solutions to minimize development time and costs. However, in the early phases enterprises are not able to make an objective choice for the best possible product, because of missing information. To evaluate multiple solutions and nevertheless develop a cost effective product the enterprises have the aim to simplify and to objectify the decision process especially in the early phases of the product development process. Therefore the enterprises need a methodology to enable objective decisions.

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A Size-Bed Wheelchair Design Manufacture with Scaled Prototype and Kinematic-Virtual Reality Model Simulation

Authors: Hasnan Bin Khalid, Saesar Budi Luhur, Yudhistira Adhi Prima

Abstract: This paper presents the design verification of a novel concept wheelchair using SimMechanics toolboxes. A wheelchair-sized bed concept (patent pending) with 3 modes of ability (sitting-lying-standing) is proposed. Design begins by deciding the actuator and the component integrated in reality. The 3D wheelchair model was done in AutoCAD 3D and in Vrealm builder to connect with simulink. All components like joint, frame, actuator, gear box and any other part of wheelchair was register in SimMechanics. To verify the kinematics model, a joystick input was connected to the model for visual movement and collision verification. Finally from virtual reality simulation and SimMechanics kinematic modeling, the movement and collision can be verified, and also the actuator condition can be reported.

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Wind Tunnel Analysis on Performance of H-Rotor VAWTs with NACA 64xx Blades

Authors: W.C. Hsieh, J.M. Miao, C.C. Lai, C.S. Tai

Abstract: The purpose of this study was to explore the effects of wind speed, airfoil thickness and setting angle of blades on the output performance of a VAWT system. Three shapes of the blades as NACA6422, NACA6412, and NACA6404 were fabricated and installed in the support mechanism to test the effect of airfoil thickness on the output performance. Results indicated that the section shape of blade with a cambered NACA 64XX series is prior to the ordinary symmetric NACA0022 series used in VAWT systems. The statistic analysis showed that the contribution of setting angle on the output performance is 12.27%, which is higher than that of thickness of airfoil as 2.93% when the extra load was applied on the VAWT system during tests. For application of VAWT systems in the densely populated urban areas, it is suggested that the blades with cambered airfoil of NACA6422 is suitable for electrical power generation.

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Numerical Simulation Applied to Study the Effects of Fractal Tree-Liked Network Channel Designs on PEMFC Performance

Authors: Shan Jen Cheng, Jr Ming Miao, Chang Hsien Tai

Abstract: The effect of pressure drop and the flow-field of inhomogeneous transport of reactions gas are two important issues for bipolar flow channel design in proton exchange membrane fuel cell (PEMFC). A novel design through the imitation of biological development of the topology distribution of fractal tree-liked network channel is the main topic of this research. The effects of different Reynolds numbers and stoichiometric mass flow rate of reaction gas on the flow field distribution of tree-like channels were investigated by three-dimensional computational fluid dynamic analysis. According to numerical simulations, the fractal tree-liked network channel would have an excellent performance on the uniformity of multi-branching flow distribution and lower pressure drop along channels. The new type of fractal tree-liked bionic flow channel network design will be applied to assist in the experimental reference for improving the performance of fuel cell stack system in PEMFC for future.

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