Jurnal Ilmiah Poli Rekayasa
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MODEL REGRESI LINEAR UNTUK PREDIKSI BIAYA KONSTRUKSI AKIBAT PERUBAHAN GAMBAR AS BUILT DRAWING
No full textConstruction projects are inherently complex and highly susceptible to variations in cost due to discrepancies in work volumes across technical design documents such as Detail Engineering Design (DED), Shop Drawing (SD), and As-Built Drawing (AD). These discrepancies often arise from design adjustments, field conditions, or execution errors, which in turn affect budget accuracy and project efficiency. Such inconsistencies in volume are particularly critical in structural works like reinforcement and concrete, as these elements account for a substantial portion of total project costs. When changes in volume occur, the corresponding cost implications must be accurately estimated to maintain financial control and avoid cost overruns. This research aims to quantitatively predict the effect of volume deviations on cost variations using simple linear regression analysis. Data were collected from nine building samples that had complete documentation of DED, SD, and AD. The study focuses on structural work units with measurements in kilograms (kg) and cubic meters (m³). Regression models were assessed based on statistical indicators such as the coefficient of determination (R²), p-value, intercept, and regression coefficients to determine the most reliable model. The results show that every additional 1 kg of reinforcement volume increases the cost by Rp19,303.00, while every additional 1 m³ of concrete adds Rp1,321,597.14 to the project cost. Both models achieved R² = 1.00, indicating perfect predictive accuracy in estimating cost variations due to volume changes. Manual validation confirmed that the predicted values were nearly identical to actual data with a negligible error rate. These results confirm that simple linear regression is a powerful yet practical analytical tool for predicting construction costs. The model developed in this study provides a scientific foundation for improving cost estimation accuracy, supporting effective budget planning, and mitigating financial risks in construction projects
ANALISIS TEKNO-EKONOMI KINERJA PEMBANGKIT LISTRIK TENAGA SURYA UNTUK FASILITAS PUBLIK DI KAWASAN WISATA PUNCAK LABUANG
Full text linkThis article discusses the performance analysis of solar power plants for public facilities reviewed from a techno-economic perspective using the Homer application. The research location in this article is the public facility of Surau Nur Jannah in the Puncak Labuang Limau Manis Tourism Area, Padang City. Based on field visits, the community conveyed the limited resources related to the development of the tourism area, one of which is the availability of electrical energy. Based on the problems conveyed by the community, Padang State Polytechnic through the Department of Electrical Engineering provides a solution to the problem of limited electrical energy sources, by offering the concept of Renewable Energy. The initial stage of providing electrical energy sources is to build an Off-Grid Solar Power Plant with a capacity of 240 WP. In order to support the construction of the Solar Power Plant at the specified location, it is necessary to conduct a performance and economic analysis of the development. This location has a fairly large potential for solar resources, on average in one year this place receives solar radiation of 4.91 kWh/m3/Day. The most optimal configuration from the simulation results is a combined system, two units of 1 kW Generic Photovoltaic, Converter, Storage / Battery. The production of electrical energy with this configuration obtains 39.6 kWh/year of electricity with a total consumption in one year of 29.2 kWh/year. The results of the analysis of the power plant's performance from a techno-economic aspect provide positive results, with a Cost Of Energy (COE) of Rp. 1,095.34/kWh. This article aims to provide an understanding of the construction of small-scale power plants for public facilities with minimum cost
PERANCANGAN ALAT PEMECAH KULIT KEMIRI TIPE DOUBLE ROLL DENGAN BAHAN ST37 KAPASITAS 82 KG/JAM
Full text linkCandlenut (Aleurites moluccana L. Wild) is an economically valuable plantation commodity in Indonesia; however, post-harvest handling is largely conducted using conventional shelling methods, which are inefficient and often cause seed damage, reducing quality and market value. Previous studies have investigated operational parameters of double roll shellers, such as rotational speed, roll spacing, and hopper width, yet most focused on one or two parameters in isolation, without comprehensively assessing the relationship between production capacity, shelling effectiveness, and kernel quality, nor comparing machine performance with traditional methods used by farmers. This research addresses that gap by designing and evaluating a double roll candlenut sheller made of ST37 steel with a target capacity of 82 kg/hour, considering production capacity, shelling efficiency, and kernel quality simultaneously. The design process included literature review, physical and mechanical characterization of candlenuts, structural and transmission system design, and calculations for power requirements and component safety. Results indicated that the maximum force required to shell two candlenuts simultaneously is 3,418.46 N, with a total machine power of 4,012.80 W (≈5.38 hp); applying a service factor of 1.2, a 6.5 hp gasoline engine was selected. Shafts, pulleys, V-belts, and gears were designed to ensure torque, shear stress, and deflection remain within safe limits. The machine operates at a roll speed of 150 rpm, achieves the targeted production capacity, and reduces kernel damage, thereby increasing the value of candlenuts for farmers. This integrated design approach provides a practical and efficient alternative to conventional shelling methods
PENGEMBANGAN SIMULATOR FETAL BERBASIS KONTROL SUARA UNTUK PENGUJIAN ALAT FETAL DOPPLER
Full text linkFetal Doppler is a diagnostic tool to detect fetal heart rate in BPM (beats per minute). Like other medical devices, it must be calibrated periodically by a health facility testing center, as stated in the Regulation of the Minister of Health of Indonesia Number 54 of 2015 article 4 paragraph 1. Article 8 paragraph 1 explains that testing or calibration of medical devices is carried out periodically at least once a year. In addition, testing must be carried out after repairs to medical devices as stated in SNI IEC 62353 of 2014. In addition to testing and calibration, medical devices need to be maintained and tested for function. Therefore, a fetal doppler simulator is needed by medical device technicians to test the function of the fetal doppler. The innovation made on this device is that the simulator is connected to a smartphone with the aim of minimizing electronic components, eliminating settings with buttons and replacing them with Voice Control on the smartphone. This fetal doppler simulator is successfully designed well, it can simulate fetal heart rate from 60-240 BPM with error value of 0% at settings of 90,120,150,180, and 240 BPM. While at setting 60 BPM there is an error value of 1.6%. This simulator is suitable for use as a reference for fetal doppler function test because the error value is below the tolerance of ±5 for BPM on fetal Doppler
ANALISIS KENDALA PENERAPAN BANGUNAN HIJAU DI INDONESIA
Full text linkThe construction and building sector have a crucial role in the economy and sustainable development in Indonesia. Green Buildings refer to buildings that pay attention to energy saving, proper water use, waste processing.The implementation of Green Buildings in Indonesia was launched in 2002 through Undang Undang No 28 tahun 2002 dan Peraturan Menteri PUPR No 21 tahun 2021 tentang Penilaian Kinerja Bangunan Hijau. The benefits of implementing Green Buildings include buildings that optimize energy use, utilize the environment to achieve good room quality such as air circulation and lighting, and process waste into something useful. Despite the many benefits of green buildings, the development of green building implementation in Indonesia is relatively slow. Barriers that cause the slow implementation of green buildings in Indonesia can be grouped into Financial, Regulatory, and Market Readiness issues. The parties responsible for encouraging the increased implementation of green buildings in Indonesia are categorized as Financial and Monetary, Private Business Entities, Organizations, and the Government. Strategies that can be implemented to encourage the increase in green buildings in Indonesia include Regulatory Adjustments, Building Mapping and Project Flow Creation, and Grants to Obtain Green Building Certification.
PERANCANGAN DAN IMPLEMENTASI ALAT PENGECEKAN KABEL NURSECALL BERBIAYA RENDAH SEBAGAI ALTERNATIF MULTIMETER
Full text linkCables in nurse call systems generally have considerable length and are distributed across multiple installation points, making them vulnerable to faults such as broken wires, loose connections, or continuity problems. These conditions can disrupt communication between patients and medical staff, potentially reducing the quality of healthcare services. Therefore, checking cable continuity before and after the installation process is a crucial step to ensure that each line is properly connected and that the nurse call system operates optimally and reliably. This study designs and tests a low-cost prototype device for checking the continuity of nurse call cables, consisting of two modules: Device A as a 9-volt power source and Device B as a two-line LED-based indicator. The novelty of this research lies in the use of a simple non-microcontroller circuit with direct visual indicators, specifically designed for on-site nurse call cable inspection as a practical alternative to conventional multimeters. The research method includes circuit design, prototype development, and field testing on cables with various length variations, followed by a functional comparison with conventional testing methods. The test results indicate that the device is capable of reliably detecting cable conditions through LED indicators that turn on or off during each test, with a high level of consistency. In addition, its low production cost and ease of use provide practical contributions for technicians involved in the installation and maintenance of nurse call systems, particularly in field conditions that require fast and efficient inspection
REKOMENDASI PENGUBAHSUAIAN GEDUNG F POLITEKNIK NEGERI PADANG MENJADI BANGUNAN GEDUNG HIJAU
Full text link Padang State Polytechnic (PNP), one of the first 17 polytechnics in Indonesia, is committed to creating a comfortable academic environment with adequate facilities and harmonious interaction between lecturers, staff, and students. Collaboration with many companies has increased the number of students and study programs admitted each year. However, the construction of facilities and infrastructure has reduced green open space by 26.88%. The construction of Buildings AB and E in 2012 has impacted the comfort and health of Building F users, obstructing air circulation and natural lighting, and increasing the demand for water and waste management. Recommendations are needed to convert Building F into a green building according to the Minister of Public Works and Housing Regulation No. 21 of 2021 to optimize natural resources, reduce environmental impact, and enhance comfort. This research aims to develop retrofit recommendations, including replacing window openings, adding green areas, planning natural lighting, and improving waste and wastewater management systems. Data was collected through literature review, observation, quantitative methods, interviews, and documentation. The initial assessment of Building F scored 21.81% according to the Checklist for Existing Buildings in the Green Building Performance Assessment, indicating a significant need for improvement. The implementation of the recommendations will potentially increase Building F's score to 70.30%, placing it in the "MADYA" category, reflecting better sustainability and efficiency standards.. This demonstrates the success of the recommendations provided and the potential to improve building performance in the futur
METODE PELAKSANAAN PEKERJAAN TANGGUL BIOGAS STUDI KASUS : PROJECT OF BIOGAS (COVERED LAGOON) TO FLARING MSL CARGILL
Full text linkSoft soil work is a major challenge in berm construction due to the physical and mechanical characteristics of the soil. Soft soil generally has high moisture content, large porosity, and weak grain structure, which leads to very low soil bearing capacity. These conditions result in the soil being unable to support the construction load optimally, thus increasing the risk of settlement and lateral deformation. These factors create challenges in the planning and execution of earthworks, as specialized methods are required to improve the soil's stability and strength to ensure the berm functions safely and effectively. The proper working methods for handling soft soil can maintain the stability and safety of the embankment. These methods include replacing the original soil, stabilizing the soil using dolken piles and gradual mechanical compaction.The research results show that the success of berm construction is greatly influenced by thorough technical planning and coordination between work stages. This method has proven effective when applied to soft soil and provides constructive solutions to the technical problems that arise in the field
ANALISA KEKUATAN RANGKA PADA DESAIN MESIN PENGAYAK PASIR ROTARI KAPASITAS 10 KG MENGGUNAKAN SIMULASI SOLIDWORK
Full text linkThis research discusses the analysis of the rotary system sand sieving machine frame with a capacity of 10 kg using Solidworks 2018 with the Finite Element Analysis (FEA) Method. This research aims to overcome manual problems in the sand sieving process in building construction by developing an efficient and reliable automatic machine. Technology is identified as a basic need of modern society because of its ability to increase efficiency and productivity in various activities. Sand, as an important construction material, must be sieved from rocks and gravel before use. Current manual sieving processes require a lot of effort and time, prompting the need for automated solutions such as the rotary sand sieving machine designed in this research. Machine design focuses on frame strength as the main component that supports operational loads. The frame strength analysis was carried out using Solidworks 2018 with the FEA method to ensure its safety and resistance to a load of 10 kg. The analysis results show that the machine frame can bear operational loads well. The maximum stress that occurs in the frame is 9.248 N/m2, far below the yield strength of the material used. The maximum deformation (displacement) that occurred was 1,058 mm, mainly concentrated in the critical areas analyzed. Safety factor analysis shows that the frame meets safety standards with a safety factor of 2.7, exceeding the expected value for construction industry application
EVALUASI LENDUTAN BALOK BETON BERTULANG DENGAN PENDEKATAN MATEMATIS: PENERAPAN TEORI EULER–BERNOULLI TERHADAP BATAS KEMAMPUAN LAYAN
Full text linkAccurate prediction of beam deflection is crucial in civil engineering structural design, ensuring both safety and functionality. This study investigates how the physical and material properties of a beam relate to the maximum deflection under various loading conditions. We used an analytical approach, applying classic deflection equations derived from Euler-Bernoulli beam theory, which assumes linear elasticity and small deformations. Our case study features a simply supported beam with a 4000 mm span. It's made of concrete with a 30 MPa compressive strength and reinforced with steel having a 390 MPa yield strength. The analysis includes common loading scenarios like concentrated and uniformly distributed loads to evaluate their impact on deflection. The calculations show a maximum deflection of 18.78 mm, which exceeds the allowable limit of 14.17 mm set by SNI 2847:2019. This study demonstrates that mathematical models reliably estimate structural behavior and are effective for design decision-making. These findings highlight the importance of analytical proficiency in structural engineering, especially during initial design and assessment phases. Integrating theoretical models with practical data improves the accuracy of structural analysis, contributing to safer and more efficient construction practices