Kumpulan Jurnal dan Prosiding Elektronik PPNS (Politeknik Perkapalan Negeri Surabaya - Pusat Penelitian dan Pengabdian Masyarakat, P3M)
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ANALISIS VARIASI PRODUK ELEKTRODA E7018 DAN KUAT ARUS PADA PENGELASAN SMAW TERHADAP HASIL RADIOGRAPHY, KOMPOSISI KIMIA WELD METAL, DAN SIFAT MEKANIK
Full text linkDuring the welding of pipe racks at a private fabrication company, there was a change in the use of electrode products in SMAW welding (Shielded Metal Arc Welding) for welding carbon steel materials, from using E7018 electrodes from Product K to those from Product W, which has no specified current limits. Based on the problem above, this research was carried out using variations of the E7018 electrode product from product K, product N, and product W. The variations current strength used 100 A and 120 A using SMAW welding with testing in the weld metal. In radiographic testing four specimens exhibited welding defects. In chemical composition testing there were differences results of the chemical composition E7018 electrode due to differences in electrode products. In tensile testing product W showed increased tensile strength if increased current. In Impact testing product K and poduct N showed increased impact energy if increased current. Based on the results of the tests that have been carried out, it can be concluded that the Electrode E7018 from product N is recommended due to its superior quality compared to product W and its more economical price relative to product K which almost the same product quality
Analisis Distribusi Tegangan Pada Redesign Struktur Sleipner Dengan Metode Elemen Hingga
Full text linkThe heavy equipment industry is one of the key sectors supporting economic growth in the mining, infrastructure, and civil construction sectors. One of the notable examples is Sleipner, a transportation system commonly used for moving heavy equipment, which facilitates the movement of such machinery. The structure of the Sleipner Shaft plays a crucial role in carrying and supporting the weight of excavators under static loads. Static loads can influence stress, and excessive stress can lead to structural failure. Therefore, in this study, a stress analysis was conducted to ensure the structure can withstand static loads during operation. A 3D model of the Sleipner Shaft structure was created using AutoCAD 2024, and then an analysis was performed using the finite element method (FEM) with ANSYS to obtain the stress values (von Mises stress). The simulation results with loads ranging from 90 tons and 125 tons in ANSYS showed a stress value of 125.88 MPa for the Half Frame design and 90.23 MPa for the Full Frame design. Additionally, the deflection resulting from varying weights on the Sleipner Shaft averaged 1.35 mm for the Half Frame design and 1.17 mm for the Full Frame design
ANALISIS VARIASI SHIELDING GAS DAN DAYA (POWER) PADA PENGELASAN LASER BEAM WELDING (LBW) JENIS FIBER LASER PADA MATERIAL SS400 TERHADAP SIFAT MEKANIK DAN STRUKTUR MIKRO
Full text linkThis research evaluates the effectiveness of Laser Beam Welding (LBW) with a Fiber Laser on SS400 material, addressing defects commonly encountered with Gas Metal Arc Welding (GMAW) on thin plates. It examines the impact of power variations (60%, 65%, 70%) and protective gases (97.5% Argon and 100% CO2) on welding performance. Testing included visual inspections, tensile strength, hardness, and metallography. Visual tests confirmed all variations met acceptance criteria. The highest tensile strength of 518.4 MPa was achieved with 100% CO2 at 70% power, while the lowest was 513.85 MPa with CO2 at 60% power. For Argon, the highest tensile strength was 485.25 MPa at 70% power, and the lowest was 402.25 MPa at 60% power. Macro testing revealed the best penetration of 1.9 mm with 100% CO2 at 70% power and the lowest of 1.6 mm at 60% power. For Argon, the highest penetration was 1.7 mm at 70% power, and the lowest was 1.5 mm at 60% power. Microstructure analysis showed that the base metal was ferritic, with the weld metal containing both ferrite and pearlite phases, the latter being more dominant. Hardness tests indicated that CO2 with 70% power had the highest hardness of 250.5 HVN, while Argon at 70% power had 243.33 HVN. CO2 provided superior tensile strength and penetration, while Argon offered a better visual appearance
STUDI NUMERIK PENGARUH PROFIL SUDU TERHADAP PERFORMA AXIAL FAN 445 MM
No full textAxial fans are often used in industrial fields. The axial fan needs are higher than the centrifugal one, so there are more and more local companies produce the fan. However, many producers ignore their performance and are more concerned with large-scale production. Based on this case, 3D modelling simulations based on Computational Fluid Dynamics (CFD) of axial fans were carried out to analyse the effect of blade profile to the flow coefficient (Cp) and power coefficient (?) values. Simulations were carried out by using symmetrical and asymmetrical blade profiles. The final results show that the best flow coefficient (Cp) and power coefficient (?) on symmetrical blade profiles are ? = 0.09454436 on NACA 0008 and Cp = 0.011033747 on NACA 0012. In the asymmetric blade profile, the best value obtained is ? = 0.124312977 in NACA 6412 and Cp = 0.012551278 in NACA 6408. Existing fan that uses NACA 6409 produces ? = 0.14682861 and Cp = 0.007272471. Therefore, the most optimum axial fan is the existing fan with NACA 6409 blade profile
KAJIAN NUMERIK PENGARUH SOLIDITY TERHADAP KINERJA TURBIN SUMBU VERTIKAL DARRIEUS UNTUK KONVERSI ENERGI GELOMBANG DENGAN MENGGUNAKAN PROFIL HIDROFOIL SIMETRIS NACA 0024
No full textWith the increasing demand for electricity and concerns over global warming driving us to reduce dependence on fossil fuels, we are exploring ocean-based energy solutions. By exploiting the kinetic power of seawater, we can convert wave energy and ocean currents into electricity. The Darrieus turbine serves as the main tool in this process, converting kinetic energy into mechanical energy, which can then be converted into electricity. In this study, variations solidity of 0.3 and 0.15 were used on a Darrieus turbine with a symmetrical hydrofoil profile NACA 0024 with a turbine diameter of 1m to produce power coefficient. The highest Coefficient of Power (CP) values were obtained on the NACA 0024 symmetrical blade profile angle of attack 5° and solidity 0,3 which is equal to CP = 0,325
Prototipe Safety Device Sebagai Sistem Monitoring dan Proteksi Pada Pembangkit Listrik Tenaga Uap Dengan Metode Decision Tree
No full textOne of the problems that occurs in power plants, mining and shipping industries which are equipped with boilers and plants with high pressure and temperature working principles is the occurrence of overtemperature, overpressure and water flow control due to several factors such as the lifetime of the equipment and its protection which is not optimal, the need for supply inappropriate air and inadequate manual protection capabilities, thereby reducing safety performance from both mechanical and electrical factors. The effects of overtemperature, overpressure and water flow control on high-pressure and high-temperature devices such as boilers in power plants, autoclaves in the metallurgical, mining and oil industries, as well as governors or main engines in maritime transportation, especially ships, can trigger dangers such as decreasing the quality of protection, fires, Steam leaks and explosions can even result in death. The solution offered is a Safety Device Panel, which is a panel that has a monitoring and protection function with temperature, pressure and air supply parameters in the steam vessel whose size can be determined according to the requirements of the high pressure and temperature equipment and the air requirements to produce steam. The systematic function of this panel is guided by the temperature and pressure parameters with a comparison set-up according to the original conditions used to contact the Relay coil which is connected to the buzzer/alarm and the ignition power source line (burner) as a warning and automatic disconnection ( automatic shutdown) on equipment to reduce the risk of accidents in accordance with K3 (Occupational Safety and Health) principles using the decision tree method. In this study produces a percentage error from the temperature, pressure and air discharge sensor readings without The output in sequence is 3.82 percent, 2.31 percent n and 3.98 percent and the sensor readings are able to produce percentages with output in sequence, namely 20 percent, 13.3 percent and 6.67 percent. Conditioning the system for good safe conditions, high temperature, high pressure and danger obtained accuracy in sequence, namely 0 percent, 10 percent, 0 percent and 0 percent. So that the integrated system conditioning and sensor readings are able to produce an average boiler prototype efficiency of 92.54%, generator power of 20.21 J/sec, generator energy of 25.26 J/sec, turbine energy of 7.58 J/sec and turbine output energy of 17.68 J/sec
PERANCANGAN APLIKASI LOG ADMINISTRASI INTERNAL DEPARTEMEN PENGADAAN JASA BERBASIS DESKTOP
Full text linkThe internal administrative log recording activities in the Service Procurement Department at a shipyard in Surabaya were previously done manually using spreadsheets, which made them prone to recording errors (human error). This study aims to design a desktop-based Service Procurement Administrative Log Information System (SILAPJA) application to improve the efficiency, regularity, and transparency of service procurement document management. The system development was carried out using the Waterfall method, which includes the stages of requirements, design, implementation, verification, and maintenance. The programming language used is Visual Basic .NET with a MySQL database connected to a Database as a Service (DBaaS) to support online data access. Each development stage was carried out sequentially and structurally, starting from user requirement analysis, system model design, program implementation, to system testing and maintenance. The research results indicate that the Waterfall method can produce a system that meets user needs with 100 score of testing and is ready for implementation to support more effective and accurate internal administrative log recording
ANALISIS BEBAN KERJA DALAM MENENTUKKAN TENAGA KERJA OPTIMAL SERTA PENGARUHNYA TERHADAP KEDISIPLINAN DAN PRODUKTIVITAS KERJA DIVISI KONSTRUKSI PADA SALAH SATU PERUSAHAAN GALANGAN KAPAL DI SURABAYA
Full text linkEmployee productivity is a critical indicator of operational performance, particularly in the shipyard industry, which demands strict deadlines and high-quality output. This study aims to assess workloads, determine the optimal workforce using the Full Time Equivalent (FTE) method, and examine the effects of work discipline and workload on the productivity of employees in the ship construction division of a shipyard company in Surabaya. A quantitative approach was applied, employing purposive sampling to select 45 respondents from a population of 113 employees. Data were obtained through observations, questionnaires, interviews, and company records. The FTE analysis indicated workload imbalances, with 16 employees experiencing overload, 21 in normal conditions, and 8 underload. Recommended workforce adjustments include adding 8 welders (to 31), adding 5 fitters (to 13), reducing 1 logistics worker and 1 helper, and maintaining 9 supervisors, resulting in an optimal total of 56 employees. Multiple linear regression analysis revealed that work discipline (X₁) had a positive and significant impact on productivity (p = 0.017), while workload (X₂) was not significant (p = 0.092). The findings suggest that improving work discipline can enhance productivity, whereas unbalanced workloads should be addressed through workforce realignment to optimize organizational performanc
Respon Getaran Sistem Propulsi Kapal General Cargo 5200 DWT
No full textThis research has identified the value of natural and excitation frequencies to resonance. This analysis uses the eigenvalue matrix method with mass and stiffness variables to find the natural frequency value that occurs in the propulsion system. The finite element method is also used to compare the natural frequency values obtained mathematically. The excitation frequency of the system is generated due to the rotation of the main engine. From the modelling results, three natural frequency values were obtained, namely 14.2 rad/s, 36.1 rad/s, and 1291.7 rad/s. The resulting excitation frequency consists of five variations of engine rotation, namely 240 rpm, 310 rpm, 347 rpm, 360 rpm, and 459 rpm. The comparison of the excitation frequency with the natural frequency shows that the propulsion system does not experience resonance. The resulting response values are displacement and velocity, where the most significant response occurs at 347 rpm with a deviation of ±0.1345 mm to ±0.3371 mm and a velocity value of ±4.8847 mm/s to ±12.2424 mm/s. Meanwhile, the slightest response occurs at 459 rpm with a deviation range of ±0.0034 mm to ±0.0050 mm and a velocity value of ±0.1634 mm/s to ±0.2382 mm/s. From all the analysis results, the vibration responses are still below the permissible threshold line, and the vibration of the propulsion system is in the acceptable area
PERANCANGAN DAN KAJIAN TEKNIS STEERING GEAR SYSTEM DENGAN CYCLOIDAL GEARBOX PADA KAPAL IKAN AUTOPILOT
No full textThis final project was created because there is no autopilot module for small vessels lessthan 24 metres in length. Generally, the steering system uses hydraulics which consists of many complexcomponents. With the introduction of the Cycloidal gearbox, the current problem can be overcome asthis gearbox simplifies the installation process and reduces the number of components. The use of anautopilot aims to improve the vessel\u27s ability to locate and identify fish more efficiently, eitherautomatically or with the assistance of the steering wheel. This research involves the design andtechnical analysis of a steering system using a Cycloidal Gearbox on an autopilot fishing boat. Anexperimental method was used with variations of 10 : 1, 15 : 1, and 40 : 1 ratios for comparison. Themain results show that the minimum torque of the stepper shaft is 393 Nm, the minimum power of thestepper is 11.77 Watts, the best gearbox ratio is 10 : 1 with the highest torque reaching 7,555 Nm, andthe gearbox efficiency is 61.73%. The estimated production cost of the prototype with 3D printingtechnology is around Rp1.661.000,00