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This research was conducted to optimize the turning process on several quality characteristics with the Taguchi-GRA method. Some of the quality characteristics that are optimized are roundness, material removal rate (MRR) and surface roughness. These three quality characteristics are then converted to a GRG value. The independent variables used in this study are the depth of cut (0.5; 0.75; 1 mm), feed rate (0.045; 0.065; 0.085 mm/rev) and cutting speed (37.68; 56.52; 75.36 m/min). The experimental design used is the L9 orthogonal array. The experimental results show that the turning process can be effectively improved through the Taguchi-GRA method. The optimal combination for obtaining maximum GRG values can be reached at a depth of cut of 1 mm, feed rate of 0.085 mm / rev and cutting speed of 75.36 m / min. The GRG value increased to 34% from 0.7017 to 0.9403.

This study analyzed the design performance of SS316L-based plate implant for fibula restoration using a Finite Element Analysis approach. The simulated model design has dimensions of 35 x 5 x 1.5 mm and five holes with 2-3 configuration. The results of the bending test simulation showed that the values for both displacement and Von Mises stress that occurred (0.008 mm and 116 MPa of each) were still considerably below the yield stress of the SS316L material. The same results were also shown in the tensile test simulation, although the clamping setting on the plate was changed on the other side. From this finite element analysis approach, the SS316L-based five-hole plate implant design has a fairly good strength performance as a fibular bone-implant restoration product.

A research was conducted for the optimization in the drilling process of KFRP stacked, with multiple performance characteristics based on the orthogonal array with Taguchi-grey-fuzzy method. The experimental study was conducted under varying the drilling process parameters (feeding speed (mm/min) and cutting speed (m/min)) and tool geometries (point geometry and point angle (degree)). The optimized multiple performances characteristics were thrust force, torque and surface roughness. The quality characteristics of thrust force, torque and surface roughness were smaller-is-better. The experimental design used L18 orthogonal array with two replications. Experimental results have shown that machining performance in the drilling process can be improved effectively through this method.

Tujuan penelitian ini adalah untuk mengetahui pengaruh variasi kuat arus, media pendingin, dan merk elektroda terhadap kekuatan tarik dan distorsi sudut sambungan baja st 37. Pengelasan SMAW menggunakan elektroda E6013 yang memiliki diameter 2 mm. Benda uji menggunakan plat st 37 dengan ketebalan sebesar 5 mm. Selanjutnya dilakukan pengujian distorsi dan uji tarik. Dalam menentukan hasil dari variansi kekuatan tarik dan distorsi digunakan desain eksperimen metode Taguchi. Karakteristik respon kekuatan tarik adalah semakin besar semakin baik, sedangkan karakteristik respon distorsi adalah semakin kecil semakin baik. Hasil penelitian menunjukan bahwa kondisi optimal untuk kekuatan tarik adalah faktor A kuat arus pada level 2 sebesar 65 ampere, faktor C merk elektroda pada level 2 menggunakan merk elektroda RB, sedangkan faktor B pendingin pada level 2 menggunakan pendingin jenis air. Sedangkan kondisi optimal untuk respon distorsi faktor B pendingin dengan level 2 menggunakan pendingin udara, faktor C merk elektroda menggunakan elektroda merk RB, dan faktor A kuat arus level 2 menggunakan 65 ampere. Berdasarkan hasil perhitungan ANOVA, kedua respon dari ketiga faktor tersebut tidak memiliki pengaruh signifikan terhadap respon.