Piezoelektrik adalah salah satu pemanen energi yang mampu mengubah energi mekanis dari getaran menjadi energi listrik. Piezoelektrik menjadi sumber energi yang menarik karena ramah lingkungan dan hanya membutuhkan tekanan berulang untuk menghasilkan listrik. Di sisi lain, bola karet adalah bola yang dapat melakukan gerakan pantulan secara berulang. Oleh karena itu, perlu dilakukan penelitian lebih jauh tentang potensi panen energi pada bola karet dengan memanfaatkan piezoelektrik. Metode penelitian yang dilakukan adalah mengetahui nilai tegangan listrik dari pengujian jatuhnya bola karet pada ketinggian 15, 20, 25 cm tepat diatas piezoelektrik berukuran 120 x 50 mm. Hasil penelitian didapatkan bahwa dua bola karet yang dijatuhkan pada ketinggian 25 cm memiliki nilai tegangan listrik tertinggi yaitu 7,712 volt. Ketinggian awal bola karet berpengaruh terhadap energi mekanik yang dihasillkan. Semakin tinggi bola karet, kecepatan saat menumbuk piezoelektrik semakin cepat, sehingga lendutan pada piezoelektrik menjadi besar dan menghasilkan tegangan listrik.
Piezoelektrik adalah salah satu alat pemanen energi yang menghasilkan energi listrik ketika mengalami defleksi. Penelitian mengenai bentuk penampang bluff body terhadap tegangan listrik yang dihasilkan piezoelektrik telah dilakukan, namun penelitian tentang potensi bluff body segitiga masih belum dilakukan. Metode penelitian yang dilakukan adalah mengukur tegangan listrik dari piezoelektrik dengan sistem kantilever. Bluff body yang dipasang sebagai penghalang adalah bluff body berpenampang segitiga dengan panjang alas dan tinggi sama yaitu, 1 cm, 2 cm, dan 3 cm. Penelitian ini dilakukan menggunakan terowongan angin mini dengan kecepatan angin 3 m/s dan jarak piezoelektrik terhadap bluff body adalah 50 mm. Hasil yang didapatkan adalah bluff body penampang segitiga 1 cm memiliki nilai efektif tertinggi yaitu 5,21 x 10-3 volt. Aliran udara saat melewati ujung segitiga bagian atas menyebabkan terjadi olakan lebih banyak dibandingkan saat aliran udara melewati alas segitiga. Semakin besar olakan yang terjadi maka udara yang menumbuk permukaan piezoelektrik semakin besar sehingga nilai efektifnya menjadi tinggi.
The study of vegetable oil used as fuel in conventional engines leads to problems like the low volatility and high viscosity. This research aims to evaluate the droplet combustion characteristics that correlated with the density, viscosity, and the flash point of the biofuel from mixed vegetable oil with clove oil. Biofuels used in research are Jatropha Oil (CJO), Kapok Oil (KSO), Coconut oil (CCO), and all biofuel mixed with clove oil in 5% basis volume. Fuel properties that tested both biofuel and fuel mixture using the ASTM method are density (ASTM D1298), viscosity (ASTM D445), The flash point (ASTM D93). The droplet combustion experiment used suspended droplets placed in the junction of the K-type thermocouple and the Ni-Cr wire (as the coil heater) to heat the droplet until the combustion occurred. The result indicates that adding 5% clove oil in biofuel creates higher density, the viscosity decreases until 10%, and the flash point decrease to 30%. Droplet combustion results that adding 5% clove oil creating a more complete combustion process in CCO than KSO and CJO. Higher viscosity in KSO and CJO leads to eugenol and terpene (clove oil compound) trapping in the fuel droplet. Due to eugenol and terpene having great volatility, they are evaporating rapidly leading to secondary atomization and micro-explosion phenomena.
This paper presents an investigation of diffusion welding of aluminum and nickel at the atomic scale by utilizing molecular dynamics simulation. By employing several temperature and pressure values, the significant influence of the two could be obtained and thus the optimum parameter values could be obtained. The results showed that the bonding mechanism is mostly promoted by Al, in which the deformation and defects are involved. The results on both the mechanical properties and the evolution of the diffusion configuration showed that temperature has more impact compared to pressure. It was indicated that by raising the temperature to 700 K with the lowest pressure (50 MPa), both the mechanical properties and the evolution of the diffusion configuration showed a relatively significant difference. On the one hand, the deformation that occurs during welding, which is mostly caused by raising the temperature, obviously promotes joining and therefore more joining depth can be achieved, although it results in a curved diffusion zone at the interface. On the other hand, it also leads to a lower ultimate tensile strength. During the tensile test, raising the temperature also led to focusing the deformation in the diffusion zone, while a lower temperature resulted in a wider area of deformation.
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