Jurnal Ilmiah Poli Rekayasa
Not a member yet
176 research outputs found
Sort by
SIMULASI HIDROLOGI SISTEM DRAINASE KAWASAN JATI KOTA PADANG MENGGUNAKAN HEC-HMS
Full text linkThe Jati Area in Padang City is one of the urban regions affected by flooding and waterlogging, particularly during the rainy season. The flooding issue in this area is not only caused by the insufficient capacity of the drainage channels but also by the lack of understanding regarding the hydrological characteristics of the region. Therefore, a hydrologically based modeling approach is essential to analyze and predict the response of the catchment area to rainfall, surface runoff discharge, and the effectiveness of the existing drainage system. In this study, the author models the drainage system in the Jati area using the HEC-HMS program, with the aim of obtaining the peak discharge value during extreme rainfall events and determining the timing of the maximum discharge. HEC-HMS is a widely used software for hydrologic modeling, particularly for simulating the runoff process from a watershed area. The research consists of three main stages: data collection, data processing, and drawing conclusions from the results. Based on the simulation results of the hydrologic modeling analysis of the drainage network in the Jati area, it was found that the channels at certain nodes are unable to accommodate the design discharge load, resulting in flooding due to the insufficient capacity of those channels. The results of this study can be used by policymakers for the redesign of drainage infrastructure, such as modifying the channel dimensions from a base width of 6.5 m, 6.8 m, and 6.8 m at reach 9, reach 10, and reach 11 respectively, to 8.5 m based on the peak discharge from the simulation results, which is 37.5 m³/s
PENINGKATAN KINERJA MESIN PRESS BAGLOG JAMUR TIRAM MELALUI MODIFIKASI SISTEM KONTROL TEKANAN SILINDER MENGGUNAKAN MAGNET CLUTCH
Full text linkManual and semi-mechanical baglog production for oyster mushrooms in Indonesia, particularly in Padang West Sumatra, has suffered from low capacity, inconsistent quality, and operator fatigue. In this study evaluated performance improvements of a baglog pressing machine through modification of magnetic clutch integration and cylinder pressure control mechanism. The modification included installing a magnet clutch with supporting components (bushing, plate disk, clutch housing), motor and gearbox shafts, redesign of the pressing plate, and dual-opening chamber. Several technique was employed such as reducer speeds (30 to 90 rpm) and threaded rod adjustments distance (1.5 to 6.5 cm). Production capacity, cycle time, efficiency, and baglog density were investigated. Based on results, the production capacity increased from approximately ±20 baglogs/hour (manually)to 120–270 baglogs/hour after modification, while the pressing cycle time decreased to as low as 13.33 s/baglog. The baglog density increased from about ±0.65 g/cm³ to ~0.709–0.900 g/cm³, with 80–90% process efficiency. Therefore, the magnetic clutch enabled precise engagement/disengagement control, enhancing safety and cycle precision. Overall, the modified machine provided an efficient for improving productivity, quality, and ergonomics for for SME’s sector mushroom production
ANALISA KEGAGALAN KONTRAKTOR DALAM PROSES TENDER DI KOTA PADANG
Full text linkKontraktor merupakan penyedia jasa yang akan mengerjakan suatu proyek kontruksi. Proyek kontruksi dilaksanakan melalui sistem terder secara elektonik dimana pada proses tersebut banyak kontraktor gagal karena kesalahan yang dibuatnya. Penyebab - penyebab kegagalan kontraktor dalam proses tender didapat dari beberapa literature dan hasil penelitian terdahulu meliputi lima faktor yaitu; aspek administrasi (X1), aspek teknis (X2), aspek harga (X3), aspek klarifikasi (X4) dan aspek lainnya (X5). Berbagai penyebab kegagalan kontraktor ini perlu diteliti agar dapat mengantisipasi kegagalan yang terjadi pada tender selanjutnya. Oleh karena itu dilakukan penelitian untuk mengindentifikasi faktor-faktor yang mempengaruhi kegagalan kontraktor dalam proses tender dengan sistem elektronik. Penelitian ini dilaksanakan di Kota Padang pada paket pekerjaan tahun 2024 dengan responden adalah kontraktor yang telah mengikuti tender secara elektronik pada situs lpse kota padang. Analisa ini menggunakan analisa kuantitatif dengan teknik pengumpulan data yang digunakan yaitu kuisioner dengan memakai instrument Skala linkert 1-5. Setelah dilakukan analisa maka didapatkan faktor paling dominan yang sering menjadi penyebab kegagalan kontrktor dalam proses tender di kota padang adalah X2.2 dukungan material dari suplier tidak ada atau salah dengan hasil mean 4,28 dan standart deviasi 0,980
RANCANG BANGUN FETAL DOPPLER NIRKABEL BERBASIS ESP32 DAN NRF24L01 UNTUK TRANSMISI AUDIO DAN NILAI FHR
Full text linkFetal doppler is an important device for monitoring fetal heart rate (FHR) as an early indicator of pregnancy condition. However, conventional fetal doppler devices still rely on cables between the probe and the main unit, thus limiting movement, reducing the comfort of pregnant women, and increasing the risk of cable damage. This study aims to design and build a wireless fetal doppler module based on ESP32 and nRF24L01 on the Taff Omicron JLS-T501 device for wireless transmission of doppler audio signals and FHR values. The developed system consists of a transmitter module on the probe side that performs acquisition, conditioning, and digitization of audio signals, then transmits data via nRF24L01, as well as an ESP32-based receiver module that reconstructs doppler audio and displays FHR values via an IoT interface. Testing was conducted using a fetal heart rate simulator at several BPM categories and distance variations (20–200 cm) to evaluate FHR accuracy, audio quality, and communication reliability. The results showed that the FHR reading error against the reference value was in the range of 1-2%, with audio quality remaining clearly audible up to a distance of 200 cm without interruption. This indicates that the integration of a wireless module on the JLS-T501 fetal doppler can improve flexibility and ergonomics of use without sacrificing measurement accuracy
EFISIENSI ESKALASI JARINGAN IRIGASI MELALUI PROGRAM PERCEPATAN PENINGKATAN TATA GUNA AIR IRIGASI (P3-TGAI) DI KOTA SOLOK
Full text linkThe city of Solok, which is located in West Sumatra, with a population of 81,059 people, has limited agricultural land of 875.6 hectares and produces 5,430 tons of rice, which has experienced a decline in rice production since 2019. This decline in rice production was caused by irrigation constraints, which prompted the government to implement the Acceleration Program for Irrigation Water Use Improvement/P3TGAI to improve the irrigation network which involves community participation, in this case the Water User Farmers Association (P3A). This research compares the efficiency of cost planning and budgeting for irrigation improvements in the Bdr Lembang irrigation area using the Unit Price Analysis (AHSP) approach. Data collected includes primary and secondary surveys, with a focus on existing irrigation conditions. The results showed that there are 5 determinants of the success of the self-management project for P3-TGAI, such as good communication between parties involved in the project (95.95); appropriate/appropriate work planning (91.89); monitoring of the project by the parties involved (89.19); ability to solve project problems by the parties involved (83.78); proper cost management by the parties involved (83.78). Then, there are 10 aspects that determine the success of P3-TGAI self-management projects, these factors are formed from the highest index in each aspect surveyed. analysis show the difference between the implementation of self-management and contracting in the use of materials and personnel because the volume of the channel length in self-managed work is 368 meters, whereas if it is contractual the channel length volume is 345.32 meters. Thus highlighting the need for effective resource management in irrigation projects
STUDI NILAI TRANSFER PANAS KESELURUHAN PADA SELUBUNG BANGUNAN PUSAT KEGIATAN MAHASISWA
Full text linkThe building envelope plays a crucial role in controlling heat transfer from the outside environment to the interior of the building, which in turn affects occupant comfort and building energy consumption. This study aims to determine the existing Overall Thermal Transfer Value (OTTV) of the Student Activity Center of Universitas Indonesia (PUSGIWA UI) building, as per the applicable Indonesian National Standard (SNI). As well as providing optimization solutions to obtain OTTV values that comply with the Indonesian national standards. The OTTV calculation results of the PUSGIWA UI building show a value of 37.80 W/m², which exceeds the SNI standard limit of 35 W/m². This indicates that the building envelope at PUSGIWA UI is not yet effective in protecting and maintaining the thermal comfort conditions within the building environment. The highest OTTV value is found on the north orientation side of the building, at 42.77 W/m². As optimization, it is recommended to replace the glass section with Asahimas Sunergy Clear glass, which has a low reflection value and better solar energy shading capability compared to the existing glass. The application of this glass can reduce the OTTV value to 28.96 W/m², which already meets the thermal comfort standards of a building. This study contributes to the planning of more environmentally friendly building envelope designs and energy efficiency
STUDI EKSPERIMENTAL PENGARUH FLY ASH DAN SERAT KELAPA PADA BETON UNTUK PERKERASAN KAKU
Full text linkConcrete structures are very vulnerable to cracking due to the brittle nature of the material and strong against pressure, but weak against tension. Meanwhile, green technology and sustainable materal are popular nowadays due to global warming issues. Therefore, subtituting material in concrete which are come from waste disposal are used in this research. Waste materials as a substitute for aggregate in concrete is currently increasing as the demand of green technology. In this research, the waste material used are fly ash and coconut fiber. Fly Ash as the replacement of cement from PLTU of Teluk Sirih and coconut fiber from Padang Pariaman will be studied. The aim of this research was to find out the effect of using Fly Ash and coconut fiber on the compressive strength and flexural strength of concrete. For the use of fiber, soaking will be carried out using NaOh which will affect the wettability angle of the fiber. The experimental method was used in this study, while the tests carried out included material testing, compressive strength test and flexural strength test. Tests carried out refer to the American Standard Testing and Materials (ASTM). Mix design were investigated based on ACI 211 4R-93 for High Strength Concrete. Based on the experimental results, the highest value of compressive strength test was attained in the 4th concrete variation with a concrete mixture of 15% Fly Ash + 1% Coconut Fiber + Sika Viscocrete with a value of 32.1 MPa and the flexural strength value as of 5.3 Mpa
ANALISIS PENGARUH GAYA GEMPA TIDAK SERAGAM TERHADAP RESPONS STRUKTUR JEMBATAN GANTUNG
Full text linkBridges are essential infrastructures that serve to connect two regions separated by various geographical conditions. Among the various types of bridges, suspension bridges are commonly used for long-span applications. The main structural components of a suspension bridge consist of the main cables and vertical suspenders. Due to their long spans, suspension bridges are susceptible to differential ground motions at each support, which may arise from varying soil conditions—this phenomenon is referred to as multi-support excitation. In this study, three types of analyses were conducted: static analysis, dynamic analysis under longitudinal seismic excitation, and dynamic analysis under transverse seismic excitation, using MIDAS Civil software. The soil conditions applied in all three analyses were assumed to be stiff soil at the left support and soft soil at the right support. The structural responses observed include internal forces and displacements. The seismic loads were defined using the time history method. The time history records were derived from the conversion of response spectra for the Bukittinggi region, considering both stiff and soft soil conditions. The results indicate that, in both longitudinal and transverse dynamic seismic analyses, the highest internal force values predominantly occurred at the support located in the soft soil area, except for moment values, which reached their maximum at the support in the stiff soil area. The maximum Dynamic Amplification Factor (DAF) in the longitudinal direction of the girder occurred at an element located at 0,25 of the span length on the right side, with a value of 2,621
SIMULASI REMOTE CONTROL PADA MESIN PENGUMPUL SAMPAH MENGGUNAKAN ARDUINO NANO BERBASIS MODUL KOMUNIKASI LORA
Full text linkThis research aims to develop a remote control system for waste collection machines using Arduino Nano and LoRa communication modules. The background of this research is the need for an effective remote control system to manage waste collection machines automatically. This system is designed to optimize the machine control process through stable wireless communication. The research process begins with system design, including block diagrams and flowcharts for remote control transmitters and receivers. The transmitter uses an Arduino Nano to read input from the button and send data via the LoRa module. The receiver receives signals from the transmitter, then controls the motor using the L298N motor driver module based on the data received. The research results show that the system can control the motorbike accurately according to the signals received, including forward, backward, right turn and left turn movements. The system is also capable of handling button combinations for more complex motor control. The use of Fritzing and Visual Studio Code in the design and programming process makes system implementation and testing easier. This research provides a practical solution for remotely controlling waste collection machines with LoRa communication
PROPORSI PENGGUNAAN SUMBER DAYA PROYEK PADA BANGUNAN GEDUNG DI BALI
Full text linkConstruction projects are activities carried out with limited time and costs. In its implementation, the project requires resources, namely materials, wages, tools and decisions on the use of subcontractors. Project implementation always begins with implementation planning. This activity consists of planning work methods, calculating project resource requirements, and determining the schedule for procuring these resources. Every project implementation always has risks in it. This risk can originate from human resources, implementation methods, and work environment conditions. Due to the limited time for implementing construction projects, it is not uncommon for planning project resource requirements to experience calculation errors. This error could be a lack of budget allocated to one of the project resource components. This research was carried out with the aim of obtaining the proportion of each resource, namely materials, wages and tools, which can later be used as a reference in preparing project plans in a short time. This research was conducted on a building construction project that functions as a hotel and villa. The projects reviewed are 2 hotels, 1 villa and 1 resort. The results of this research show that the average proportion of project resource use to the total value is (1) Materials 64.45%, (2) Wages 24.75%, (3) Tools 7.64%, and (4) use of subcontractors 3 .17%. The proportion of use of material resources, equipment, wages and subcontractors is greatly influenced by the type of building construction, material specifications and work contracts