Jurnal MEKANIKAL
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ANALISIS KINERJA ALAT BANTU PENGUKURAN PANJANG INSERT DALAM PEMBUATAN ULIR UNTUK PULLEY SHAFT
Full text linkEvery activity of producing goods is likely to result in defective products and damaged products caused by several factors. Supervision of production results is needed to reduce the number of defective and damaged products. In addition, the quality control analysis process will have an impact on the company's reputation and increase consumer confidence in the company's performance, the manufacture of pulley shafts must be produced with great care to produce excellent product quality. To avoid the number of defective and damaged products that occur, an analysis of each process must be carried out, which aims to quickly find the root causes of product defects and make improvements to eliminate or minimize ongoing defective products. The analysis was carried out using the Fishbone diagram method, namely analyzing the Man, Machine, Method, Material sections. Based on the results of the analysis of the research data, product defects that occur in the effective diameter of the thread occur due to differences in the length of the insert cutting edge for the screw feeding process in the manufacture of pulley shafts. So an improvement was made by making production aids to measure the length of each insert. The measurement results refer to the master insert that was made before, so that the deviation value is obtained which will be input into the program. Performance analysis is carried out on measurement tools so that they can assist in an effective and efficient production process. From the results of analysis and research, it was found that this measurement tool is very helpful in the insert replacement process so that it can reduce the number of defective products produced after replacing the insert eye or a new insert
UJI EXPERIMENTAL RATIO OVERLAP SUDU SPLIT SAVONIUS TERHADAP UNJUK KERJA TURBIN WATER VORTEX
Full text linkUtilization of low-lying areas is an option in developing hydroelectric power plants with low head. This study uses a split savonius rotor with 2 blades, Aspect ratio 1.2, Tip Clearance 5 mm, total head 0.649438 m, water level in the inlet 25 cm, the test was carried out on a whirlpool turbine with a spiral basin, aiming to determine the resulting performance. savonius split rotor on a vortex turbine by varying the Overlap Ratio. There are 4 rotors that have different overlap ratios which are tested at a flow rate of 0.0021 m³/s with loading treatment until the turbine stops. The results showed that the 0.15 Overlap Ratio resulted in the best performance with torque, power, and efficiency values of 0.14620 N.m, 1.7853 watts, and 13.392%, respectively. While the one that produces the lowest value is 0.45 Overlap with each value of 0.08240 N.m, 0.8411 watts, 6.310%
PENGARUH PROSES POST WELD HEAT TREATMENT (PWHT) PADA PENGELASAN SMAW TERHADAP KEKUATAN TARIK BAJA ST 60
Full text linkEffect of Post Weld Heat Treatment (PWHT) Process on SMAW Welding on Tensile Strength of ST 60 Steel. This study aims to determine the effect of variations in holding time 30 minutes, 45 minutes, and 60 minutes after undergoing the welding process using the SMAW welding method. The electrode used is RD-260 with a diameter of 2.6 mm. The type of seamused is V seam with an angle of 60o. The current used is 100 Ampere, the tests carried out are tensile strength, hardness (vikers), and microstructure. This research was conducted at the Materials Testing Laboratory of the Department of Mechanical Engineering, Faculty ofEngineering, Tadulako University. The results of the tensile test showed that the tensile stress strength at a holding time of 60 minutes had the highest value of 704.61 MPa and the lowest value of holding time of 30 minutes was 683.77 MPa. For tensile strain, the highest value is at a holding time of 60 minutes, which is 33.86% and the lowest is at a holding time of 30 minutes, which is 31.58%. For the modulus of elasticity, the highest value is at a holding time of 60 minutes, namely 5383.16 MPa and the lowest is at a holding time of 30 minutes, which is 5111.77 MPa. The highest average hardness value is found at a holding time of 30 minutes, which is 195.059 Kg/mm2 which is located in thewelding area and the lowest at a holding time of 60 minutes, which is 160.938 Kg/mm2, which is located in the base metal area. The results of the microstructure in the weld area and HAZ show that the structure of ferrite and pearlite grains is more dominant.Keywords: Holding time, SMAW, ST 60 Steel, Tensile Strength, Hardness, and Microstructur
PERBANDINGAN BENTUK PENAMPANG BATANG PROFIL C DAN U TERHADAP KUAT BENDING
Full text linkPada penelitian ini bertujuan untuk mengetahui perbandingan bentuk penampang profil C dan U terhadap kuat bending. Dalam pengujian ini spesimen yang di gunakan yaitu baja berbentuk lembaran dengan ukuran panjang 300 mm, lebar 170 mm, dan tebal 1 mm yang di buat menjadi profil C dan U. Ukuran setiap model profil yang sama mempunyai lebar(B) atau tinggi (H) yang sama. Metode pengujian yang di gunakan yaitu uji bending. Pengujian dilakukan di Laboratorium Pengujian Bahan dan Pengukuran Teknik Mesin Fakultas Teknik Universitas Tadulako. Berdasarkan hasil penelitian dan pengujian nilai kekuatan bending terbesar pada profil Cmodel 1 (CH40B55) 48,12 MPa, model 2 (CH45B52,5) 44,79 MPa, model 3 (CH50B50) 38,14 MPa . Profil U model 1 (UH40B65) 33,60 MPa, model 3 (UH50B50) 13,82 Mpa, model 2 (UH65B52,5) 10,59 Mpa. Berdasarkan hasil penelitian ini jika tinggi spesimen lebih besar dari lebar spesimen maka tegangan bending semakin kecil, untuk bibir kanal pada profil Csangat berpengaruh terhadap tegangan bending sehingga dapat kita lihat bahwa profil C lebih kuat dibandingkan profil U.Kata kunci : Baja profil, Kuat bending, Bentuk penampan
PENGENDALIAN KOROSI PADA BAJA ST 42 MENGGUNAKAN INHIBITOR EKSTRAK DAUN SIDAGURI PADA MEDIA H2SO4
No full textCorrosion Control on ST 42 Steel Using Sidaguri Leaf Extract Inhibitor on H₂SO₄ Media. This study aims to determine the effect of Sidaguri leaf extract as an inhibitor on the corrosion rate immersed in H₂SO with inhibitor variations 0%, 0.1%, 1%, and 10%. The immersion time was 168 hours, 336 hours, and 504 hours. The method used to measure the corrosion rate is weight loss. This research was conducted in the Mechanical Engineering Laboratory of the Faculty of Engineering and the Pharmacy Laboratory of Tadulako University. The results of the corrosion rate test on ST 42 steel soaked in H₂SO₄ and given inhibitor of Sidaguri leaf extract increased the corrosion rate with increasing immersion time so that the percentage of corrosion rate and weight loss increased, the effect of Sidaguri leaf extractwith inhibitor concentration 0.1%,1%, and 10% indicates the greater the concentration, the slower the corrosion. because of the tannin content in Sidaguri leaf extract which can inhibit the corrosion rate.Keywords: Weight loss, Corrosion Rate, Sidaguri Leaf Extract, Steel ST 42, H₂SO₄
STUDI EKSPERIMENTASI OPTIMASI FAIRING PADA KENDARAAN TRUK
Full text linkThis study aims to determine the effect of changes in drag with the addition of a fairing on the roof of the truck cabin. The various fairing designs used certainly have different effects to determine the optimal fairing design that can reduce the drag coefficient on the truck. The result of this research concludes that the shape of the fairing design has an influence on the magnitude of the drag force that occurs on the truck for the optimal fairing model is the fairing model with the smallest drag coefficient value where the shape of the fairing used is fairing C on the truck, the drag coefficient value generated is that as low as 0.639. For the percentage of decrease in the value of the highest drag coefficient on trucks when using fairing C with an average percentage decrease of 18.54%.Keywords: Truck Fairing, Drag Coefficient, Aerodynamics
PENGARUH FRAKSI VOLUME TERHADAP KEKUATAN GESER KOMPOSIT SERAT BUAH KELAPA SAWIT
Full text linkInfluence Of Volume Fraction On Shearing Strength Of Composite Of Palm Fruit Fiber. This study aims to determine the shear strength and the effect of water absorption of oil palm fruit fiber composites with volume fraction variations while fiber volume fractions were 10%, 20%, 30% and 40%. The method used in this research is experimentally using a composite material made from palm fruit fiber with a polyester matrix. Compost testing includes shear testing referring to ASTM D5379. The results of the study of shear strength testing on the composite of oil palm fiber found that the highest shear value was found in the 20% fiber volume fraction, which was 20.04 MPa, the lowest at 40% fiber volume fraction, which was 16.45 MPa.Keywords: Composite, palm fruit fiber, shear strength, water absorption polyeste
UJI EXPERIMENTAL TURBIN PUSARAN AIR (VORTEX) MENGGUNAKAN ROTOR SPLIT SAVONIUS DENGAN VARIASI TIP CLEARANCE
Full text linkThis study aims to determine the performance of the split savonius rotor on a vortex turbine, the savonius rotor used is different from the conventional type, by being designed without a center axis, without a top-plate diameter, and without an end-plate diameter, which is intended so as not to block the vortex flow that will flow out through the vortex outlet hole. The performance of the rotor is tested by comparing the torque, power, and efficiency produced at three of tip clearance with the ratio of the distance of the rotor from the bottom of the basin to the surface of the water. The test was carried out at a flow rate of 0.0021 m³/s with shaft loading to show maximum rotor performance. The results show that the performance of the rotor increases as it approaches the bottom of the basin because the mass flow rate is relatively larger than the fluid that rotates the rotor as it approaches the bottom of the vortex. The best performance of the split savonius rotor was recorded at the tip clearance ratio of 0.02 with maximum torque, power, and efficiency values of 0.148327 N.m, 1.815971 Watt, and13.622%.Keywords: Vortex Turbine, Tip Clearance, Savonius Split Rotor, Savonius Hydrokinetic Turbine (SHT
RANCANG BANGUN SISTEM SHELTER MENGGUNAKAN RADIO FREQUENCY IDENTIFICATION (RFID) BERBASIS INTERNET OF THINGS (IOT)
Full text linkThe internet of things (IoT)-based design of the shelter system uses radiofrequency identification (RFID) to serve disaster victims in refugee camps. Recipients of basic necessities only need to bring an RFID card that has been registered by the admin, by bringing the Radio frequency identification (RFID) card closer. It has implanted user data such as name and address into a card reader fastened to the center of the front of the device as a numeric code. Then you'll be given the choice to conduct a transaction or check yourrice balance, When the user presses the transaction button, the NodeMCU ESP32 microcontroller sends data while checking the database on the web; if the rice balance is sufficient and the RFID card is registered, the servo rice valve cover will open to fill the rice storage container, and the DC motor on the conveyor will move the container. When the user hits the balance check button, the NodeMCU ESP32 microcontroller sends data to the webdatabase, and the remaining balance is displayed on the LCD. Furthermore, the stock of basic necessities can be tracked through online applications and Android apps.Keywords: RFID, Basic Food, Rice Shelters, Disaster Victim
SIFAT KUAT TARIK MATERIAL KOMPOSIT HIBRID BERPENGUAT SERAT IJUK DAN SABUT KELAPA DENGAN ORIENTASI SERAT ACAK
Full text linkPenelitian ini bertujuan untukmelakukan pengujian sifat kuat tarik pada material komposit hibrid dengan penguat serat ijuk dan serat sabut kelapa, guna mengetahui kemampuan mekanis material tersebut dalam kaitannya menahan beban atau gaya yang bekerja, sehingga dapat diketahui nilai kuat tarik yang ditimbulkan.Bahan penyusun komposit yang digunakan adalah serat sabut kelapa yang mengalami perendaman NaOH 5% selama 24 jam dan serat ijuk tanpa perlakuan. Dengan fraksi volume serat ijuk dan serat sabut kelapa 30%:0%, 10%:20%, 15%:15%, 20%:10% dan 0%:30%. Komposit hibrid yang telah dicetak kemudian dibentuk menjadi spesimen uji tarik dengan standar ASTM D 638-02.Hasil pengujian kekuatan tarik tertinggi pada fraksi volume serat ijuk dan serat sabut kelapa 15%:15%, yaitu 23,48 MPa. Kemudian kekuatan tarik terendah 0%:30% yaitu 17,19 MPa. Regangan tarik tertinggi pada fraksi volume 20%:10% yaitu 31,49%. Kemudian regangan tarik terendah 30%:0% yaitu 27,38%. Modulus elastisitas tertinggi pada fraksi volume 30%:0% yaitu 76,14 MPa. Kemudian modulus elastisitas terendah 0%:30% yaitu 55,33 MPa. Hasil foto makro disetiap variasi serat ijuk dan serat sabut kelapa cenderung menunjukkan pada patah getas atau brittle serta mengalami fiber pull out.Kata Kunci :Komposit hibrid, kuat tarik, serat ijuk, serat sabut kelapa, acak