International Journal of Precision Engineering and Manufacturing-Green Technology
Total thickness variation (TTV) of sapphire wafer is one of the most important geometrical parameters as it is related with the quality of LED. In the wafer manufacturing, single-sided lapping is the final process to correct wafer TTV, but there are few understanding about the mechanism of TTV generation. The authors focused on the effect of platen shape on TTV generation. Because changes of platen...
Chicken eggshell (ES) is an aviculture byproduct that has been listed worldwide as one of the worst environmental problems. The effective utilization of chicken eggshell (ES) biowaste is strongly encouraged in our society for environmental and economic reasons. The present work deals with development of AA2014/carbonized eggshells particulate composites by electromagnetic stir casting process at optimized...
Piezoelectric systems are commonly utilized to transform mechanical vibrations to electrical energy that can be used to diverse power devices. In this work, it has been studied to improve the efficiency of a piezoelectric system with modification of the shape of a piezoelectric module and its vibration mode using analysis and experimental approaches. The basic shape of piezoelectric plate used in...
Starch has been considered as an attractive biopolymer because of its low cost, low density, and biodegradability. However, its poor compatibility with other polymers is drawback, and many researches were performed to overcome this in the polymer blends. Gelatinization, a technique to enhance miscibility among polymers, has been intensively studied due to its better processability than starch. Poly...
Modern inspection systems based on smart sensor technology like image processing and machine vision have been widely spread into several fields of industry such as process control, manufacturing, and robotics applications in factories. Machine learning for smart sensors is a key element for the visual inspection of parts on a product line that has been manually inspected by people. This paper proposes...
A multi-metal Ti/Zr/Mo combined inorganic salt coating was prepared on 6063 aluminum alloy using chemical conversion technology. 3D super depth digital microscope clearly showed the coating have a color appearance after the TiZrMoC (Ti/Zr/Mo chemical conversion) process. The comparison tests of adhesion force with polyester coating and electrochemical properties demonstrated this TiZrMoC process have...
In this paper, an underwater glider (UG) has been studied and developed for observing the ocean environment. The design and control of a new underwater glider (UG) having a high horizontal speed of the maximum 2.5 (Knots) was studied. For this, the capacity of buoyancy engine which performs 2.5 (Knots) horizontal speed was designed. Also, a controllable buoyancy engine to regulate the amount of buoyancy...
This paper presents a review of structural health monitoring techniques for carbon-based materials and structures. Based on the piezoresistivity of carbon, elastic deformation and the failure of carbon structures are visible by monitoring the electrical resistance. Carbon structures have an in-situ real-time self-sensing capability, eliminating the need for additional sensors. Numerous researchers...
Most parallel hybrid tractors are conceptualized as a motor which serves as an auxiliary power source that handles loads which an engine does not cover. However, the development of hybrid tractors for better traction performance does not show greatly improved fuel consumption compared to conventional tractors, meaning that different means of controlling- the power source is needed for hybrid tractors...
Recent interest in condenser tubes for an automotive heat exchanger is linked to developing a tube with high strength to allow the minimization of the wall thickness and the multi-hole of the cross section. These goals can be achieved by using alternative materials and strengthening the design of the tube’s cross-section. However, the design of the tube’s cross-section indicates that the gains from...
The number of studies on the environmental impact of products and services has increased in order to protect the environment. Recently, environmental impact assessments (EIA) and life cycle assessments (LCA), typically used for evaluating environmental impacts, have been gaining in popularity. Accordingly, this study performed an EIA using LCA methodology focusing on the manufacture of composite small...
The sustainability of manufacturing processes is one of important issues in the aspect of green technology to deal with global warming and finite resources. Direct metal additive manufacturing (DMAM) processes are widely used to fabricate three-dimensional metallic parts with geometrical complexity through layer-by-layer deposition of metallic materials. The layer-by-layer deposition characteristics...
Since carbon emission level of electric railway system is much lower than that of automotive transportation, electric railway system has been known as eco-friendly and low-carbon transportation. Recently, to expand the use of such railway system, there is global tendency of developing high speed railway system. In parts of high speed railway system, contact wire which supplies electricity to railway...
Design of piezoelectric energy harvester for a wide operating frequency range is a challenging problem and is currently being investigated by many researchers. Widening the operating frequency is required, as the energy is harvested from ambient source of vibration which consists of spectrum of frequency. This paper presents a technique to increase the operating frequency range and to enhance the...
The online version of the original article can be found under http://dx.doi.org/10.1007/s40684-016-0034-2
Electrochromism is a phenomenon involving change of colors under an externally applied voltages Because its importance is rising today, various fabrication processes have been used to manufacture electrochromic devices (ECDs). In this review, solution-, vapor-, and solid particle-based processes are introduced and compared in terms of process parameters. The seven representative fabrication processes...
The quasi-static tensile electroplasticity of 1180CP ultra-high strength steels (UHSS) is experimentally investigated. A single pulse of electric current with a short duration less than 0.5 sec is applied to the specimen under tensile plastic loading. The experimental result shows that flow stress of the UHSS nearly instantly drops at moment of electric current, followed by strain hardening until...
For comfortable driving conditions, flexible polyurethane (PU) foams are used for sound absorbers in noise, vibration, harshness (NVH) systems. The cellular structures of PU foams are important to improve the sound absorption efficiency, and the cell morphology is strongly dependent the use of experimental ingredients such as catalysts and cross-linking agents. Uniform cavity size distribution is...
In this study, Cold Rolled 340 (CR340)/Carbon Fiber Reinforced Plastic (CFRP) composites were fabricated, and experiments and simulation were performed to compare their flexural properties from three-point bending tests. The mechanical properties of CR340 and CFRP were input by dividing the material regime into elastic, plastic, and fracture regions in order to improve the simulation reliability....
The present study is about pitch control system of a small wind turbine using hinge mechanism. Small wind turbines generally apply stall control method or breaking equipment over the rated wind speed by reason of price or efficiency. However we perform pitch control applying the hinge mechanism which is simpler than that of medium and large size wind turbines. The hinge mechanism is a kind of linkage...