Tujuan dari penelitian ini adalah untuk menentukan frekuensi pribadi (wn) dan kekakuan (k) balok aluminium kantilever dengan variasi panjang dan ketebalan balok. Penelitian ini menggunakan metode elemen hingga, balok aluminium yang ditumpu kantilever dibagi menjadi lima elemen dengan berbagai ukuran, lebar balok 5 cm, variasi panjang 25 cm, 50 cm, dan 75 cm, variasi ketebalan 0,25 cm, 0,5 cm, dan 0,75 cm. Hasil penelitian menunjukkan bahwa poisisi elemen, panjang dan ketebalan balok berpengaruh besar terhadap nilai frekuensi pribadi (wn), kekakuan (k). Nilai frekuensi pribadi berubah pada setiap dimensi balok aluminium dengan nilai maksimum 42746 rad/s untuk balok P = 0,25 m (panjang minimum) dan T = 0,075 m (tebal maksimum) pada posisi nodal 1 (dekat tumpuan). Nilai minimum frekuensi pribadi pada 178.1 rad/s untuk balok P = 0,75 m (panjang maksimum), T = 0,0025 m (tebal minimum) pada posisi nodal 5 (ujung balok). Nilai kekakuan balok memiliki kecenderungan yang sama dengan frekuensi pribadi dengan nilai tertinggi yaitu 92502 x 103 kg/m dan nilai terendah 1610 kg/m. Hasil ini menunjukkan bahwa semakin tebal balok dan pendek balok maka nilai frekuensi pribadi dan kekakuan meningkat. Posisi elemen dekat tumpuan kantilever juga memiliki frekuensi pribadi dan kekakuan tinggi jika dibandingkan posisi yang jauh dari tumpuan.
Tujuan dari penelitian ini adalah untuk mengetahui karekteristik perpindahan, kecepatan, dan percepatan getaran akibat peningkatan masa berputar yang tidak seimbang (unbalance mass) pada balok kantilever aluminium. Penelitian ini menggunakan metode eksperimental dengan memvariasikan massa tidak seimbang pada motor penggetar. Alat dan bahan yang digunakan dalam pengukuran langsung yaitu vibration meter, motor penggetar, balok aluminium seri 6061, dan tumpuan kantilever. Vibration meter digunakan untuk mengukur jarak perpindahan getaran, intensitas getaran atau kcepatan getaran, dan perubahan laju keceparan atau percepatan. Level getaran diukur pada dengan menambahkan massa tidak seimbang pada massa yang berputar dimotor pengetar dengan variasi penambahan massa sebesar: 1.2 gr, 1.56 gr, 1.9 gr, 2.29 gr. Alat sensor getaran diletakkan diatas balok tumpuan dari motor penggetar. Hasil pengujian eksperimental getaran menunjukkan bahwa nilai perpindahan, kecepatan, dan percepatan meningkat ketika massa ditambahkan pada motor pada radius 15 mm dari poros motor. Penambahan massa tidak seimbang akan menyebabkan gaya eksitasi bertambah dan meningkatkan level getaran. Hasil pengukuran menunjukkan perpindahan getaran tertinggi pada massa (m4): 2.29 gr dengan nilai 0.72 mm dan terendah pada massa (m1): 1.2 gr dengan nilai: 0.09 mm. Kecepatan getaran (v) tertinggi dengan nilai 181.55 mm/s dan minimum pada 74.05 mm/s. Sedangkan percepatan getaran (a) tertinggi pada 175333 mm/s2 dan terendah pada 132017 mm/s2. Kata kunci: getaran, massa tidak seimbang, aluminium, kantilever, motor
Analysis of the effect of welding position and electrode movement pattern on hardness,it can be concluded that the electrode movement pattern has an influence on the hardness result. The purpose of this study was to determine the effect of the electrode angle on the mechanical and physical properties of low carbon steel from the SMAW welding process. The research method used is hardness testing and microstructure analysis. The results obtained are that specimens with different electrode angles, namely 300, 450, and 600 produce an average in each welding area such as the weld area, haz area, and different areas where the greater the angle the higher Also the average for each weld area and also on the analysis of microstructure shows that the weld metal area with electrode angles of 300, 450, and 600 shows the same microstructure or does not show any effect. the larger the area of the weld metal with electrode anglesof 300, 450, and 600, the larger the ferrite area, the larger the area of the weld metal with angles of 300, 450, and 600 pearlite grains.Keywords: electrode angle, low carbon steel, microstructure, welding
The application of technology by modifying mechanical devices into automatic tools is one approach to facilitate human work so that it can work effectively and efficiently. The application can be applied to the trash by applying electronic technology that allows the device to open and close automatically. The purpose of this research is to make a smart trash can. The method developed in the trash can is to use a microcontroller, ultrasonic sensor, servo motor, and a drive mechanism to open the garbage cover automatically, making it easier when disposing of garbage. Based on the tests carried out, it can be concluded that the design of the trash can using ultrasonic sensors, servo motors based on the Arduino microcontroller, and the mechanical drive system can produce the required output according to the design. The ultrasonic sensor and its mechanical system can function very well according to the plan. The test method shows that there is no difference between the programmed sensor reading distance and the sensor reading distance, with a minimum and maximum sensor distance of 10-60 cm. The programming and mechanical system for opening the garbage cover can be designed with an opening angle of 5°-65° and an opening speed of 0.28-1.23 s with a variation of the closing holding time of 1-5 s, indicating that the servo motor and its mechanical system can function properly. according to the program created.
The aim of the study was to determine the amount of electrical energy generated from methane gas produced from the volume of waste. The research method is carried out by literature review and field surveys, as well as theoretical calculations. Data was collected at the Tempat Pembuangan Akhir (TPA) and Kendari City Sanitation Office, by meeting and interviewing people directly related to the landfill management process, communities in energy independent settlements, as well as in the municipal sanitation office. The results of the study revealed that the energy produced from the Tempat Pembuangan Akhit (TPA) Puuwatu in the daily average was 288,466.5332 kWh. The amount of electrical energy that has been utilized by the Pemukiman Mandiri Energi is 1,080 kWh. The untapped energy is 287,386.5332 kWh.
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