Abstract. The optimization technique of machining parameters considering multiple performance characteristics of non conventional machining EDM process using Taguchi method combined with grey relational analysis (GRA) is presented in this study. ST 42 steel was chosen as material work piece and graphite as electrode during this experiment. Performance characteristics such as material removal rate and overcut are selected to evaluated the effect of machining parameters. Current, pulse on time, pulse off time and discharging time/ Z down were selected as machining parameters. The experiments was conducted by varying that machining parameters in three different levels. Based on the Taguchi quality design concept, a L27 orthogonal array table was chosen for the experiments. By using the combination of GRA and Taguchi, the optimization of complicated multiple performance characteristics was transformed into the optimization of a single response performance index. Optimal levels of machining parameters were identified by using Grey Relational Analysis method. The statistical application of analysis of variance was used to determine the relatively significant machining parameters. The result of confirmation test indicted that the determined optimal combination of machining parameters effectively improve the performance characteristics of the machining EDM process on ST 42 steel.
This research was carried out on electrochemical machining (ECM) process using a workpiece material of SKD 11 tool steel and electrode of brass. Three process variables, i.e., voltage, electrolyte concentration and gap width with three levels for each process variables investigated. Based on the number of process variables and its level, an orthogonal array of L9 and two times replications employed in the design of the experiment. Setting a combination of significant machining parameters to maximize the material removal rate and minimize the surface roughness of the workpiece based on the results of optimization using the Taguchi method and weighted principal component analysis is a combination of voltage factors at level 3 of 48 V, electrolyte concentration at level 2 of 150 g/l, and gap width at level 1 of 1 mm. Machining parameter that has the greatest contribution is an electrolyte concentration which is 41.98%, then the contribution of voltage of 32.33%, and the gap width is 5.63%. Based on the results of confirmation experiments reveal that principal component analysis can effectively acquire the optimal combination of cutting parameters.
Smallholder coffee farmers can increase their income and competitiveness by increasing the quality of green beans produced. One of the suitable coffee bean processing technologies to be adopted in Telemung Village, Banyuwangi Regency, East Java is honey processing method. This method will produce green beans at twice the selling price of traditional processing. This quantitative research involved 15 respondents as smallholder coffee farmers. The sample in this study uses a purposive sampling technique, namely farmers who have received training on the honey processing method. The data were collected using a structured questionnaire with face-to-face interviews. The analysis showed a significant relationship between perceived ease of use and intention to adopt the technology (r= 0.724; p= 0.002), and this result was supported by a significant correlation between perceived ease of use and perceived usefulness (r= 0.730; p= 0.002). It can be concluded that farmers have a positive perception regarding the ease of use and usefulness of the honey process method. However, the barrier to technology adoption is marketing uncertainty and this technology has not been practiced in the local community.
This appliance is a micro-scale solar power plant intended for a temporary power source in areas affected by natural disasters in Indonesia that is portable, and is equipped with basic equipment such as a charger port and LED lights. The material used for the PV is aluminium with ceramic cooling which is designed in the form of a suitcase so that it is robust, water and fire resistant.
As a coastal area, Banyuwangi has a variety of marine potential that can be harness, both in terms of tourism and in terms of fishing. This certainly must be equipped with ships that the design are in accordance with the conditions of the Banyuwangi sea, and the special purpose of the ship. So it is become necessary to test hydrodynamic characteristic of the ship hull. Hydrodynamics testing is one of the engineering subject in the field of naval architecture technology. This field, studies the behavior of the object motion or ships hull that are in the water. The existence and movement of objects in water create a boundary layer where if the boundary layer is wider the consequence is resistance will increase, so that the ship's fuel consumption also increases. The hydrodynamic analysis in this study is based on the observation method of water flow generated by the ship's prototype, and the ship's maneuver conditions. For this reason, in this research, an experimental test equipment for fast boat (tourism) and fishing boat needs to be designed. The equipment is a Mini Circulating Water Channel Tank, this experimental device can help the design stages of fast boats and fishing boats before fabrication, so it is able to minimize design failure. Mini Circulating Water Channel Tank is designed with a length of about 3 meters and a height of 2 meters with a maximum flow speed of 4 m / s and in the upper position will be given a special suspension clamp to provide a feasible simulation of ships sailing on the high seas, so as to provide data accurate regarding the condition of the hull and the behavior of the ship's movements.
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