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All Journal International Journal of Research in Community Services Operations Research: International Conference Series Teknika STTKD: : Jurnal Teknik, Elektronik, Engine International Journal of Ethno-Sciences and Education Research Coreid Journal
Zakaria, Kiki
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Religion Humanities Computer Science & IT Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mathematics Mechanical Engineering Social Sciences Transportation Other

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Failure Mode and Effect Analysis (FMEA) for Improving the Efficiency of a Two Combustion Chamber Downdraft Gasification Stove Suryaman; Zakaria, Kiki; Yuningsih, Siti Hadiaty
Operations Research: International Conference Series Vol. 6 No. 2 (2025): Operations Research International Conference Series (ORICS), June 2025
Publisher : Indonesian Operations Research Association (IORA)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47194/orics.v6i2.387

Abstract

The growing energy demand in areas lacking access to modern infrastructure drives the development of biomass-based thermal technologies, such as the dual-chamber downdraft gasification stove. This stove offers higher efficiency and lower emissions compared to direct combustion but still poses failure risks in various system components. This study aims to identify critical failure modes affecting the thermal efficiency of the stove through the Failure Mode and Effect Analysis (FMEA) approach. The analysis involved mapping the system's structure and functions, followed by evaluating failure modes using three parameters: Severity (S), Occurrence (O), and Detection (D) to obtain the Risk Priority Number (RPN). Results indicate the highest risk occurs in the combustion system (RPN 180), followed by the air control system (RPN 160). Key causes include suboptimal secondary air distribution and valve blockage. Other systems such as insulation, maintenance access, safety, and fabrication had lower RPNs but still require design and quality control improvements. Recommendations focus on improving airflow design, using high-temperature-resistant materials, and adopting precision fabrication procedures. Using the FMEA approach, the gasification stove can be enhanced in terms of reliability, efficiency, and user safety, making it more feasible as a small-scale renewable energy solution for communities.
Design and Evaluation of a Temperature–Humidity Control System for Mushroom Cultivation Using a DHT11 Sensor Suryaman, Suryaman; Yuningsih, Siti Hadiaty; Setiawan, Aan Eko; Zakaria, Kiki
CoreID Journal Vol. 3 No. 2 (2025): July 2025
Publisher : CV. Generasi Intelektual Digital

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.60005/coreid.v3i2.103

Abstract

Oyster mushroom (Pleurotus ostreatus) cultivation requires stable temperature and humidity conditions to support optimal mycelial development and fruiting body formation. This study aims to develop and evaluate a low-cost temperature–humidity monitoring and control system for an oyster mushroom cultivation room using a DHT11 sensor integrated with an Arduino-based controller. An experimental evaluation was conducted by comparing DHT11 temperature and humidity readings with a reference measuring instrument under cultivation-room conditions, while the control function was tested using threshold-based rules for activating environmental actuators (heater, fan, and humidifier). The results indicate that the DHT11 sensor produced measurements close to the reference instrument within the tested range, with temperature differences of 0.1–0.3°C and humidity differences of 0.2–0.4%RH across the observations. These findings suggest that the proposed system is feasible for basic environmental monitoring and supports automated threshold-based control for maintaining cultivation conditions near recommended ranges. Sensor performance and measurement stability are influenced by practical factors such as airflow, proximity to heat or moisture sources, and sensor placement; therefore, appropriate placement and shielding are important to minimize local bias. The originality of this work lies in providing an implementable prototype and an empirical sensor performance assessment in a mushroom cultivation environment, offering practical guidance for low-cost smart farming applications.
ANALISIS UMUR PAKAI (LIFETIME) BEARING 6207 KNCG PADA KOMPONEN TAKE OFF ROLL MESIN TEXTURIZING MURATA 33-H DI PT. XYZ Noviandani, Pradika; Thomas, Fendy; Zakaria, Kiki; Hadiaty Yuningsih, Siti
Teknika STTKD: : Jurnal Teknik, Elektronik, Engine Vol 11 No 2 (2025): TEKNIKA STTKD: JURNAL TEKNIK, ELEKTRONIK, ENGINE
Publisher : Sekolah Tinggi Teknologi Kedirgantaraan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56521/teknika.v11i2.1477

Abstract

The textile industry plays an important role in the national economy, especially in absorbing labor and contributing to foreign exchange through export activities. One of the crucial processes in the textile production chain is yarn texturization, which greatly determines the physical and aesthetic characteristics of the yarn as the final product. PT. XYZ is a textile company that produces polyester-based textured yarn using a Murata 33-H type texturizing machine. This machine operates continuously at high speed and is highly dependent on the reliability of its mechanical components, one of which is the 6207 KNCG type bearing installed on the Take Off Roll section. Bearings function to support rotating shafts with high loads and speeds, so they are very susceptible to wear. Bearing failure can cause production downtime, damage to other components, and decreased product quality. Therefore, a predictive approach is needed in maintenance by analyzing the bearing lifetime theoretically. This study aims to calculate the estimated bearing lifetime and prepare a replacement schedule and appropriate preventive inspection to support smooth operations. The analysis results show that the theoretical lifetime of the 6207 KNCG bearing reaches 4.354,1 hours or around 181.6 operational days. Considering the safety factor, a replacement schedule of every 3.487,2 hours is recommended. In addition, routine inspections are carried out periodically to detect early signs of damage. This strategy is expected to improve machine reliability, maintenance cost efficiency, and production continuity at PT. XYZ.
Combustion Performance Comparison of Charcoal and Coconut Shell Charcoal Briquettes for Renewable Energy Applications Suryaman; Zakaria, Kiki; Halim, Nurfadhlina Abdul
International Journal of Ethno-Sciences and Education Research Vol. 6 No. 1 (2026): International Journal of Ethno-Sciences and Education Research (IJEER)
Publisher : Research Collaboration Community (Rescollacom)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46336/ijeer.v6i1.1164

Abstract

The increasing demand for renewable energy has encouraged the utilization of biomass-based solid fuels derived from agricultural waste. This study experimentally compares the combustion performance of coconut shell charcoal and coconut shell charcoal briquettes under controlled laboratory conditions. The evaluation focused on combustion temperature characteristics, burning rate, effective burning duration, and thermal efficiency using the Water Boiling Test (WBT) method. The results indicate that coconut shell charcoal achieved a higher peak combustion temperature of approximately 720 °C and a higher burning rate of 9.6 g/min, reflecting rapid and intense heat release. In contrast, charcoal briquettes exhibited a more stable combustion behavior with a longer effective burning duration of about 78 minutes compared to 42 minutes for charcoal, and a higher thermal efficiency of 31.4%, while charcoal reached 23.6%. These differences are mainly attributed to variations in bulk density, porosity, and combustion kinetics between the two fuel forms. Overall, coconut shell charcoal is more suitable for applications requiring rapid heat generation, whereas charcoal briquettes offer superior performance in terms of fuel efficiency, combustion stability, and sustained heat output, making them a more favorable option for renewable and efficient biomass energy applications.
Implementation of Fuzzy Logic Control on a Robotic Arm Prototype for Object Position Detection Suryaman; Pangestu, Tegar Dwi; Mardiati, Rina; Setiawan, Aan Eko; Yuningsih, Siti Hadiaty; Zakaria, Kiki
International Journal of Research in Community Services Vol. 7 No. 1 (2026): International Journal of Research in Community Service (IJRCS)
Publisher : Research Collaboration Community (Rescollacom)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46336/ijrcs.v7i1.1101

Abstract

The rapid advancement of robotics technology has significantly enhanced industrial automation, enabling continuous, precise, andefficient operations. This study aims to design and implement a Fuzzy Logic Control (FLC) system based on the Mamdanimethod in a robotic arm prototype capable of detecting and classifying object positions automatically. The prototype utilizes anArduino Mega 2560 microcontroller as the main controller and a Pixy2 CMUCam5 vision sensor for object detection. Two maininput parameters are used: Turn (object position) and Area (object distance from the camera). The control outputs are the angularpositions of the base and elbow servos. Experimental results show that the FLC system achieves high accuracy with a mean errorof 0.25% for the base servo and 0.27% for the elbow servo, compared to simulation and manual calculations. Furthermore, thefuzzy-based system demonstrated superior efficiency in detecting object positions (center, left, right) compared to non-fuzzycontrol. These findings indicate that implementing Mamdani Fuzzy Logic significantly improves the precision and responsivenessof robotic arm movement in object detection and manipulation tasks
Co-Authors Hadiaty Yuningsih, Siti Halim, Nurfadhlina Abdul Noviandani, Pradika Pangestu, Tegar Dwi Rina Mardiati, Rina Setiawan, Aan Eko Suryaman Thomas, Fendy Yuningsih, Siti Hadiaty