Jurnal Asiimetrik: Jurnal Ilmiah Rekayasa & Inovasi

Cover and Preface Vol. 7 No. 1, January 2025

2025-01-30T17:17:15+00:00

Design of A Multi-Speed Pneumatic Linear Transfer System

2025-01-31T01:03:59+00:00

One of the fastest-growing industries in this modern era is automation, with the goal of enhancing efficiency, productivity, and precision. In this context, production system automation is key to achieving these goals. This research reviews the use of pneumatic linear transfer systems in modern manufacturing industries that are oriented toward efficiency, productivity, and flexibility. This research uses the VDI 2221 method in conjunction with structured design approaches and pneumatic technology to design and construct a multi-speed pneumatic linear transfer system. New developments in the pick-and-place system allow it to accelerate for picking up objects and decelerate for placing them utilizing a pneumatic system. With an emphasis on enhancing production process efficiency, productivity, and flexibility, it is hoped that this research will significantly contribute to developing automation technology in the manufacturing sector. The FEA analysis results also show that this multi-speed pneumatic linear transfer system tool can safely accommodate the applied load.

Erosive Wear Characteristics Analysis of High Chromium White Cast Iron using Finite Element Analysis (FEA)

2025-01-31T01:11:14+00:00

Erosive wear often occurs on heavy machinery operating under extreme conditions. This research utilizes the Finite Element Analysis (FEA) method with the Cowper-Symonds strain rate model to analyze the erosion behavior of high-Cr cast iron (HCCI) under different impact angles and compare it to other materials of different characteristics, such as 6061-T6 Aluminium, GH4720Li Superalloy, and Stainless Steel 304 Annealed. A single particle erosion model was made for this study. The erodent particle size used is 0.7 mm in diameter, with the target material measuring 1 x 1 x 0.5 mm. The particle velocity is kept constant at 25 m/s. Based on the simulation results, it can be known that HCCI performs the best at every impact angle. Moreover, from the model's cross-section, it's evident that the material's stress concentration aligns with the direction of movement of the erodent particle. Therefore, it can be concluded that these factors, along with others such as contact time, plastic strain, and surface deformation lead to variations in surface mechanics.

Forecasting Methods Proposal and Implementation of Distribution Requirement Planning Method to Overcome Unfulfilled Stock Availability at PT. XYZ

2025-01-31T01:23:14+00:00

PT. XYZ is a manufacturing company engaged in the automotive sector by producing various automotive components. Based on the results of observations and interviews at PT. XYZ, it is known that there is a shortage of stock, so that customer or consumer requests are not fulfilled at each existing distribution center (DC). Based on the problems that occur, the research result suggestions for the best forecasting method based on the time series plot of each DC request processing using the Distribution Requirement Planning (DRP) method. In addition, with the DRP method, there is additional stock. The company still has remaining stock so it can still meet customer demand for each DC, and the product distribution process runs more regularly if any defective product should be replaced. Based on research results, the DRP method is able to minimize the risk of unfulfilled demand due to product defects.

Proposing a Land Suitability Analysis Method for Green Open Space in Nusantara Capital City

2025-02-05T01:00:35+00:00

Green open spaces are regarded as infrastructures that have a major positive impact on urban residents' quality of life and the sustainability of urban growth. Green open spaces play an important role in Nusantara Capital City with the theme of forest city. Examining any techniques employed in earlier research is crucial to determining the accurate location. Understanding the different approaches should enable one to suggest ways for further research in land suitability for green open spaces. We used the literature review of twenty relevant international papers from 2016 to 2023 as our method. In line with previous research, the study's findings show that the analytical hierarchy process is the most popular method employed for land suitability analysis for green open space in Nusantara Capital City. The evaluation criteria that suit Nusantara Capital City are elevation, slope, land use land cover, accessibility, water bodies, and population. The analytical hierarchy process can help further research in land suitability analysis for green open space in Nusantara Capital City.

Exploratory Factor Analysis for Developing Wheelchairs for Children with Cerebral Palsy

2025-01-31T01:30:38+00:00

A wheelchair is an essential mobility tool for individuals with limitations, including children with Cerebral Palsy (CP). Cerebral palsy affects children under five and causes stiffness in various body parts. The design of wheelchairs for children with CP differs significantly from standard wheelchairs, prompting this research to identify the key factors that should be considered in designing such wheelchairs. This study used exploratory factor analysis, data was gathered from children with CP and their caregivers in Java. The findings revealed six fundamental factors to consider when designing wheelchairs for children with CP: Main features, Ultimate comfort, standard compliance, robust durability, thoughtful ergonomics, unique special features, user-friendly design, and aesthetic appeal. In summary, while the main features are crucial in the design of wheelchairs for children with CP, it is equally important that these wheelchairs comply with applicable standards and incorporate special features tailored specifically for these young users.

Inventory Management and Proactive Maintenance to Enhance Operational Efficiency in Excavators: Focus on Common Spare Parts Issues

2025-01-31T01:34:38+00:00

Effective inventory management and maintenance are critical for the operational efficiency of heavy equipment such as excavators. This study focuses on optimizing spare parts inventory for Cummins diesel engines using the min-max stock method. It aims to improve inventory control by categorizing spare parts into slow-moving, medium-moving, and fast-moving components and addressing maintenance issues that impact performance. The research utilized the min-max stock method to determine optimal inventory levels, ensuring spare parts availability while minimizing holding costs. Key maintenance issues in components such as track shoes, cam shafts, rear shafts, motor starters, and exhaust manifolds were identified through inspections. Advanced diagnostic tools, including vibration analyzers and thermal imaging, were used for proactive maintenance. The study identified critical wear and damage in components like track shoes, cam shafts, and exhaust manifolds, which could lead to equipment failure if not addressed. Implementing the min-max stock method helped reduce stockouts and overstocking, ensuring an optimal balance in inventory. The results demonstrate that integrating the min-max stock method with systematic maintenance practices significantly improves operational efficiency. The use of real-time diagnostic tools enabled early issue detection, reducing downtime and maintenance costs. This study emphasizes the importance of inventory optimization, regular inspections, and timely maintenance interventions for enhancing equipment reliability. Future research should explore predictive maintenance technologies to further refine inventory and maintenance strategies in the heavy equipment sector.

Investigation of Flap Dimensional Parameters to Improve Hydrodynamic Performance of Oscillating Wave Surge Converter Device

2025-01-31T01:41:02+00:00

Renewable energy transition is a strategic step in overcoming environmental damage due to fossil fuel exploitation. Ocean wave energy comes with its popularity, considering its advantages in supplying energy continuously and having high energy density. Therefore, technology that can extract other wave energy effectively and efficiently is needed. This study focuses on identification flap geometry to improve the oscillating wave surge converter (OWSC) hydrodynamic performance. Through a numerical approach, the Boundary Element Method (BEM) is applied in three-dimensional flap modeling to accommodate testing the characteristics and performance of the OWSC device. This study identified five different samples: geometry 1, geometry 2, geometry 3, geometry 4, and geometry 5. The results show that the second geometry variation is the most optimal flap dimension parameter. The best proportion is found in the dimensional characteristics parallel to the elevation of the ocean waves to maximize the output torque. Overall, the second geometry performs satisfactorily with an average maximum power achievement of 41.52 Watts at a wave period of T = 1.5s. In addition, the OWSC device with this variation can work at an expansive wave period interval with a maximum CWR efficiency achievement of up to 52.14%.

The Effect of Hydrostatic Pressure on the Performance of Oscillating Wave Surge Converter

2025-01-31T01:46:17+00:00

The latest energy demand increasingly drives innovation in ocean wave energy technology, including the Oscillating Wave Surge Converter (OWSC). This consider analyzes the impact of water profundity varieties on the execution of OWSCs put on the seabed. The study was conducted numerically using the Boundary Element Method by testing four variations of air depth at wave periods between 1.2 and 2.8 seconds and wave amplitudes of 0.1 meters. The results show that the optimal depth, equivalent to the flap height (D2), produces the highest maximum displacement due to the balance between hydrostatic pressure and wave energy the flap receives. Conversely, depths that are too shallow (D1) or too deep (D4) result in smaller displacements due to the instability of the movement in shallow air and the attenuation of wave energy in deep air. In addition, more extended wave periods tend to decrease the changing cycle frequency but increase the symmetry of the flap movement at a certain depth.

Utilization of Single and Double Orifice Plates in Pipe Inner Flow Structure by Computational Method

2025-01-31T01:50:56+00:00

The orifice plate is a device that disrupts the flow in the pipe. The disturbed flow results in the formation of flow structures. The flow structure formed can be utilized for several applications such as multi-fluid mixing and microbubble generator. Using orifice plates to utilize the flow structure results in more significant pressure loss. This study aims to identify the characteristics of the flow structure generated by single and double orifice plates with 1D and 2D spacing at various Reynolds numbers, namely Re = 1×10⁴, 5×10⁴, 1×10⁵, and 5×10⁵, as a basis for application in these various applications. The results show that single and double orifice plates can produce flow structure phenomena such as recirculation and vortex regions. The recirculation area is formed smaller in the double orifice plate due to the flow that is separated faster to converge back to the pipe wall but broader so that the flow of the orifice plate is narrower. Increasing the applied Reynold's number causes the separated flow to reconnect to the pipe wall faster, resulting in a smaller recirculation area. Double orifice plates are more suitable for applications that require a certain degree of mixing or pressure distribution, but with a consequent more significant pressure loss. Meanwhile, single plates can be used for simple needs with little pressure loss.

The Analysis of Banana Slices Machine Frame Using Computational Method

2025-01-31T01:55:28+00:00

The culinary industry, especially banana chip processing, dramatically supports the economy of micro and small enterprises (MSMEs) in Indonesia. However, the traditional process is time-consuming, especially at the cutting stage. The banana-slicing machine is designed to speed up this process with consistent and efficient cuts. This study analyzes the performance of the banana-slicing machine frame by testing variations in loading (20 N to 200 N) and frame materials, namely Low Alloy Steel, Structural Steel, Stainless Steel, Aluminum Alloy, and Cast Iron, to determine the optimal material. The results showed that Low Alloy Steel is the best material because it has the lowest total deformation, equivalent stress, and strain energy, reflecting high stiffness and load efficiency. With an elastic modulus of 212.5 GPa and an economical price ($1.3–1.5/kg), this material offers the best balance in terms of technical and economics. Structural steel also performed well but was slightly lower than low alloy steel. In contrast, Aluminum Alloy has the highest deformation and strain energy, making it less suitable for this application. Overall, Low Alloy Steel is an ideal choice to improve the efficiency and reliability of the banana-slicing machine.

The Vertical Residence Based on Biophilic Architectural Design Concept (Case Study: Taman Anggrek Residence Apartment West Jakarta)

2025-01-31T01:59:58+00:00

Vertical housing represents a viable and effective option for residential solutions. Various efforts have been made to reintegrate the relationship between humans and the buildings they inhabit. Biophilic design represents a contemporary approach to reconnecting organic life with constructed spaces. This study aims to explore the architectural strategy of biophilic design as a solution to housing needs, focusing on integrating natural elements into living spaces to create a comfortable environment for residents. The investigation utilizes qualitative approaches, incorporating observation and data gathering, to discern the biophilic requirements of apartment inhabitants. The framework of 14 patterns of biophilic design, aimed at improving health and well-being within built environments, acts as a standard for evaluating the implementation of these patterns. The objective is to implement biophilic design in communal living spaces, considering the users of the building, the functions of the spaces, and utilizing knowledge, experience, and user requirements as a foundation for evaluation.