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This project has designed a material treatment process to extend the lifespan of extrusion augers used by the social enterprise Appropriate Energy Saving Technologies (AEST) in Uganda. AEST uses an extruder machine to recycle agricultural waste into charcoal briquettes that they sell to low-income families. The auger components wore down quickly and needed a hardening process to remain useful for...
The need to maintain instantaneous equilibrium between supply and demand is a major constraint in the electric power system operations. Energy storage has the ability to solve this issue by allowing energy to be stored and released upon demand. Pumped hydro storage is portrayed as a viable resource that is being mostly used for storing energy. It is also considered one of best storage option that...
This contribution demonstrates an application of non-stationary frequency modulated thermal wave imaging technique for the numerical characterization of a mild steel sample containing random shape defects. Frequency and time domain based phase analysis schemes are implemented on the recorded thermal profiles and their detectabilities are compared by taking signal to noise ratio into consideration.
This paper presents the details of experimental set-up to determine the ballistic limit for the aluminium tank for two cases, empty and water-filled tank. The experiment was carried out at Science and Technology Research Institute for Defense (STRIDE) Batu Arang. The aluminum tank was 3 mm thick, 150 mm wide and 750 mm long. At the end of the tank were closed with two Polymethyl methacrylate (PMMA)...
We present our design and submersion evaluation of a custom bio-compatible implant capsule to house our wireless telemetry system for cardiac monitoring. The package is 3D printed in two sizes and four different materials: ABS, bio-compatible ABS-M30i, RDG720 Transparent Acrylic, and 316L Stainless Steel. A long-term 98 day and 1 week short-term water immersion study is performed to validate the design...
A novel prospective way of continuous surface heating of steel work-pieces by a laser beam is modelled. The process is supplemented with pre-heating and post-heating of the heated parts by a classic inductor in order to avoid unacceptably high temperature gradients and subsequent mechanical stresses in the processed material. Its continuous mathematical model is solved numerically in 3D in the hard-coupled...
The objective of this paper is to provide a Design Of Low-Speed Permanent Magnet Synchronous Wind Generator (LSPMWG) by Conventional Inner-Rotor Radial-flux (CIRRF) topology to small direct-drive wind energy conversion system (SDWECS). Finite element analysis (FEM) was carried out to obtain magnetic flux density, Air-gap flux distribution versus Angles, Eddy-Current Loss, Hysteresis Loss, Anomalous...
The maintenance of public lightning equipments is an important and frequent activity of power utility company in Brazil. This service is usually executed using a truck with aerial bucket or a manual ladder. Despite the bucket truck being consolidated as a versatile device for several tasks across the electricity network, it still presents disadvantages such as the difficult on using it in urban areas...
This paper presents a simple yet effective method to determine the flux density-magnetic field intensity (B-H) characteristics of the magnetic material used in a salient pole synchronous machine (SPSM). This is achieved by distributing the magnetic field intensity, H, in the different parts of SPSM using 2D Finite Element (FE) simulations and theoretical calculations. The distribution is based on...
This paper addresses the influences of CO2 and FKL-laser and mechanical cutting on the magnetization characteristics and specific losses of electric steel sheets determined by Epstein frame measurements on rectangular samples and by measurements of stator lamination stacks. We provide experimental results based on three different materials commonly used with electric machines.
With the rapid development of urban rail transit in China, it is greatly significant to deeply study the interaction effect between urban power distribution system (UPDS) and urban rail transit traction power supply system (URTTPSS). At first, this paper introduces the research background and significance of URTT PSS modeling and simulation in power distribution system. Secondly, based on PSCAD software,...
As the environment pollution is becoming more and more serious and the nature resources have been running out, the electric vehicle plays a more important role in the world. However, it is well known that the inadequate driving range is the inherent limitation that hinders electric vehicles widely. This paper aims to analysis and optimize the low speed electric vehicle material by using hybrid materials...
Carbon/carbon composite materials has superior performance in underwater corrosion resistance, high temperature resistance and high abrasion resistance that promises to be a new applied materials in the water turbine seal ring. But in turbine abnormal vibrations occur during operation, resulting in carbon/carbon composite material fracture. In this paper, four kinds of adhesive materials consisting...
Crankshaft as the heart of the piston engine, this paper uses aviation engine crankshaft as the research object, introduces the classification of metal heat treatment process, and analyzes the working conditions, material selection, crankshaft forging temperature and heat treatment process. And as the crankshaft heat treatment quenching cracks, oxidation and decarburization an example, analysis the...
In this paper, we present measurement results of material penetration loss and reflection coefficient as a function of antenna polarization at 5.8 GHz. The measurements were made in a typical building hallway with a variety of test materials. This is a unique measurement campaign because the same antenna apertures were used to create three different types of polarizations: linear, circular polarized,...
The purpose of this research is to assess an applicability of wearable robot for the shipbuilding works. We developed two types of wearable robot that can be separated by actuation mechanism; one is directly actuated by electric motors and another is actuated by electro-hydraulic actuators. The lifting capacity of both of the robot is currently about 30kg. We performed field tests in 7 kinds of workplaces...
Energy storage devices have become more indispensable in our lives. Among various energy storage devices, supercapacitors have been considered as one of the most promising candidates. In terms of the components of supercapacitor, current collector plays a significant role in enhancing the performance of the supercapacitors. Here we report a novel current collector preparation method through depositing...
This work aims to characterize the microstructure and temperature field of the hermetic packaging structure by welding the cover made of Kovar alloy and the base made of a low-carbon low-alloy steel (i.e., #10 steel) using parallel seam welding (PSW) process. The microstructure of welded joints and distribution of elements were analyzed by scanning electron microscopy (SEM) equipped with energy dispersive...
The welding quality in the form of nugget diameter and the tensile strength of resistance spot welding in low carbon steel was experimentally investigated. Two types of low carbon steel; the uncoated plate of SPC 270D and the coated plate of SCGA 270D with the same thickness of 0.7 mm were used and studied in this experiment. The process determination of optimal welding conditions was done based on...
The mechanical damage evaluation of Z2CN18.12N welding joint with Lamb wave was concerned in this study. The excitation parameters were optimized from the aspects of number of cycles, central excitation frequency, and the electric fields excitation profiles of the piezoelectric transducers. Moreover, the influence of the mechanical clamping was also analyzed. Results show that the enhanced anti-symmetric...
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