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Part 1 Composition Materials with Metal Matrix Condensed from the Vapor Phase
Full text linkThe data of condensed from vapor phase disperse reinforced materials design is presented. It is shown that the material\u27s mechanical properties depend on matrix type, types of dispersed particles, temperature and roughness of the substrate, purity of initial materials, and its evaporation speed
Design and Control Strategy of Bio-inspired Underwater Vehicle with Flexible Propulsor
Full text linkBiomimetics aims to take inspiration from nature and develop new models and efficient systems for a sustainable future. Bioinspired underwater robotics help develop future submarines that will navigate through the water using flexible propulsor. This research has focused on the Manta Ray species as batoid has a unique advantage over other species. This study also aims to improve AUV (Autonomous Underwater Vehicle) efficiency through biomimetic design, the purpose of which is to observe and study the marine environment, be it for sea exploration or navigation. The design and prototyping process of bioinspired AUVs have been mentioned in this study, along with testing a propulsive mechanism for efficient swimming and turning capabilities. The Robot was designed taking structural considerations from the actual Manta-Ray locomotion and body design. The propulsion mechanism and control circuit were then implemented on the developed systems. The prototype of the Manta Ray was able to generate a realistic swimming pattern and was tested in an acrylic tank. The experimental results obtained in the tank basin are very close to the results we observe in the real-world scenario in terms of the vehicle\u27s forward and turning motion
Study of Composition Variation on Dielectric and Impedance Spectra of Tetragonal-Rhombohedral System in (1-x)BZT-(x)BCT Composites
Full text linkAbstract: In present work, (1-x)[BaZr0.2Ti0.8O3]-(x)[Ba0.7Ca0.3TiO3] (BZT-BCT) (where x = 0.50, 0.60 and 0.75) were fabricated by solid-state reaction technique. Structural, dielectric and impedance properties of the synthesized composites were investigated and discussed in detail. The X-ray diffraction technique shows that all the samples possessed a double-phase polycrystalline sample with a tetragonal-rhombohedral structure. Dielectric and impedance behavior were investigated in a wide range of temperatures (room temperature (RT) - 500˚C) and frequency (100 Hz ≤f ≤ 1 MHz). A broad dielectric constant peak was observed around the phase transition temperature
How to Build a Linkage between High-Quality Assurance Production System and Production Support Automated System
Full text linkTo maintain the planned production volume for potential disaster, the Japanese manufacturing industry needs to develop and rebuilt the global product that is to strengthen QCD (Quality, Cost, and Delivery). The keys to fulfilling this need are automated facility, human skills to operate the facility (production operator), and a production system incorporated with production data systems that activate the facility and human system subject to each overseas plant conditions. Therefore, the author has created a new system that ensures the necessity of building a new production system for global production, eliminates ambiguity among the processes of production planning, production preparation, production and process control, and formalizes and builds the linkage among the processes. This paper is to reveal the effectiveness of the above-specified objectives of the newly created systems. Especially the highly accurate robot production system has been tested and confirmed at Toyota Motor Corporation
Establishment of Body Auto Fitting Model “BAFM” Using “NJ-GPM” At Toyota
Full text linkAbstract: The Toyota Production System (TPS) exemplifies Japanese manufacturing. It has been further developed and spread in the form of internationally shared global production systems. The author has proposed the New Japan Global Production Model “NJ-GPM”, a system designed to achieve worldwide uniform quality and production at optimal locations – the keys to successful global production at Toyota. Based on NJ-GPM, the author has further established the Body Auto Fitting Model “BAFM”. The author has realized innovative unmanning of a fitting line by integrating the technologies utilizing BAFM. The ability to automatically fit and tighten door, hood and luggage compartment panels to the car body was achieved, utilizing robotics, vision systems, bolt tightening and product quality management. This paper shows the development of the highly reliable production system combining the following three items: (1) panel fitting accuracy, (2) automatic bolt tightening, and (3) integration into flexible assembly line at Toyota
Smart Grid Method for the Lubumbashi Distribution Network Based on Provision of Renewable Energy Resources
Full text linkAbstract: The development of smart grids (SG) in the electrical network is the subject of many studies nowadays. This new technology seems to be as an additional tool and the perfect solution which the D.R. Congo could use to achieve the objectives of the efficient management of electrical energy, electrical network security, and the inclusion of renewable energy sources. The rise of these new networks brings together many economic issues.
This study is essentially focused on the incapability of the National Electricity Company (SNEL) which still retains the monopoly of production and distribution of energy to individuals, industries and mining companies. The incorporation of a system of control and management of the two-ways energy flow between the sources of electricity production and users via an intelligent distribution network, considering several specific constraints and performance required, will allow us to highlight the influence of intelligence in a distribution network as complex as that of the city of Lubumbashi. This study reviews the challenges of renewable energies in the environment of the city of Lubumbashi, the modeling of the distribution network, the introduction of intelligence control in the network and simulation using computer tools to see the contribution of these results to the entire electrical system. Finally, the integration of new renewable energy sources associated with its monitoring system is planned to stabilize this network by increasing the efficiency of the system with 25 percent in power quality
Formation Mechanism of Eutectic Microstructure for Ca(Zr,Hf)O3/(Zr,Hf)O2 by Rapid Solidification Process at High Temperature
Full text linkAbstract: Ca(Zr1-x,Hfx)O3/(Zr1-xHfx)O2 (x=0, 1/3, 0.5) eutectic film was prepared by rapid solidification process using high power laser irradiation method. The coating process was performed in an electric furnace at 1300°C. Solidified film with fine lamellar structure were obtained. When the Zr site was substituted with Hf, the lamellar spacing increased with the amount of the substitution. Separate from the solidification film prepared by laser irradiation, rapidly solidifying sample with x=0.1 composition was prepared using optical floating zone apparatus. The melt of the sample was free-fallen onto a copper dish. No film-like rapidly solidified sample was obtained. Hf ion was homogeneously solid-soluble in both phases of CaZrO3 and phase ZrO2
Material Selection and Design for Assembly Applied in the Development of an Energy Generating Device
Full text linkThis study used the Design for Assembly (DFA) and material selection methods as tools to aid the development of a conceptual design of a functional device to transform alternate movement into rotational movement on the axis of a microgenerator. Also, material selection software was used to define the most suitable thermoplastic materials for some components of the projected device, focusing both on performance and low cost. There was a considerable reduction in the number of parts in the set from the basic device (prototype), which had 47 parts, to the conceptual design I, with 34 parts, and the conceptual design II, with 14 parts. The total mass of the set was also considerably reduced, from 160 grams for the basic device to 57.01 grams in the conceptual design I and, finally, 18.30 grams in the conceptual design II. Of thermoplastic materials analysed, considering a selection focused only on performance the most promising candidate, with an ideal set of properties is PEEK. But for a selection that considers the price, that is one of the key variables in the materials selection for most products, PEEK shows is prohibitively price
Study of a Cutting Fluid Application System Adaptation on a Bench Milling Machine for an Academic Laboratory Environment
Full text linkAbstract: Cutting fluid is a resource that can benefit machining, improving the service life, surface, and dimensional qualities of cutting tools. For the operation of a basic cutting fluid application system, it is necessary to consider the components that store, filter, and induce the flow of the cutting fluid. Some essential components are the reservoir, the filter, and the pump. Aiming to provide better machining conditions, this study presented the proposal for designing and manufacturing a cutting fluid application system for an academic laboratory\u27s bench drill/milling machine. The experimental research characterized the study methodology, in which the system was built with the least possible resources. The main result showed that the system achieved the proposed objective. For pump selection, a system of equations was developed in Microsoft Excel software, which indicated a pressure variation in the flow system of approximately 15 kPa. After the three-dimensional modeling, a script for the manufacture and assembly of the system components was prepared, involving the processes of forming, machining and welding. Adaptations were made to the machine tool, such as the insertion of a limit switch that reduced the longitudinal displacement of the work table by 150 mm. An electronic command system was inserted to control the cutting fluid flow. In the testing phase, positive aspects were observed (reservoir position, absence of leaks, cutting fluid flow, among others) and negative aspects (cutting fluid return paths). Some further improvements proved possible, especially on a machine not designed to have a cutting fluid system
A High Precison Phase Extraction Algorithm from a Single Shot Interferogram
Full text linkAbstract. Phase shifting interferometry is an optical metrology with a high precision, but it usually requires the expensive high precision phase shifter. Therefore, low cost methods of extracting phase from a single shot interferogram were very valuable, but available algorithms are usually effective only in a limited conditions. To solve these problems, a novel method is presented in this work. Based on this method, the interference fringe is retrieved to a wrapped phase and divided into different regions and the index of the pixel is calculated. The pixels in the same region have the same parity and the PSF’s gravity center of part wavefront so as to solve the sign ambiguity. The theoretical simulation results indicate that the PV of wavefront error is 0.00054λ and the rms is 0.000125λ,which is much better than the results from the Fast Fourier Transformation method. The experimentally measured interferogram is also used to validate the method. It has the advantages of simplicity, high precision and effective for both open and closed interferometer fringes