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Andi Adriansyah
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Fakultas Teknik Universitas Mercu Buana Jl. Raya Meruya Selatan, Kembangan, Jakarta 11650 Tlp./Fax: +62215871335
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Sinergi
Published by Universitas Mercu Buana
ISSN : 14102331     EISSN : 24601217     DOI : https://dx.doi.org/10.22441/sinergi
Core Subject : Engineering,
Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering
SINERGI is a peer-reviewed international journal published three times a year in February, June, and October. The journal is published by Faculty of Engineering, Universitas Mercu Buana. Each publication contains articles comprising high quality theoretical and empirical original research papers, review papers, and literature reviews that are closely related to the fields of Engineering (Mechanical, Electrical, Industrial, Civil, and Architecture). The theme of the paper is focused on new industrial applications and energy development that synergize with global, green and sustainable technologies. The journal registered in the CrossRef system with Digital Object Identifier (DOI). The journal has been indexed by Google Scholar, DOAJ, BASE, and EBSCO.
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 16 Documents
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Search results for , issue "Vol 26, No 2 (2022)" : 16 Documents clear
Recondition injector nozzle and its pressure effect on performance parameters of diesel engine Komatsu types SAA12V140E-1 Amiral Aziz; Zul Fahmi
SINERGI Vol 26, No 2 (2022)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/sinergi.2022.2.005

Abstract

The injector is one of the main components of a diesel engine fuel system. A typical fuel injector has two basic parts: the nozzle and the injector body. If either of these components is clogged or damaged, it will compromise the entire performance of the engine. Any injector problem can easily be fixed by cleaning, reconditioning, or replacement. If the engine is producing low power, replacing the injector nozzle with a new injector nozzle is necessary, so that engine performance reaches standard performance. However, replacing a new injector nozzle carries a huge maintenance cost. In this research, reconditioning or repairing the used injector nozzle to increase the fuel injection pressure in the engine is one solution that can be done to improve engine performance with low maintenance costs. The testing results found that brake power and brake thermal efficiency increase as fuel injection pressure increases, but specific fuel consumption decreases. For both the used injector and repaired injector, the minimum specific fuel consumption (SFC) does occur at the maximum brake power (BP) not generated. This means that the diesel engine never occurs in a condition of maximum power generated with minimum specific fuel consumption or vice versa.
The effect of variation of shear walls placement on the response of building structure using the Direct Displacement-Based Design method Hanif Satria Aji; Anis Rosyidah; Jonathan Saputra
SINERGI Vol 26, No 2 (2022)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/sinergi.2022.2.009

Abstract

Shear walls' placement in specific positions could develop different structural responses to the building and affect the structure's strength to the received lateral loads. This research aims to find the variations in the shear walls' placement on the structure's response under the Direct Displacement Based Design (DDBD) method. The object of this research is the model of a 10-story reinforced concrete building located in Yogyakarta, Indonesia. Modelling of building structures is carried out in this study with four variations of shear wall placement. First, the walls are located at every building's corner. The shear wall is then positioned in the core of the building, where the apertures have shrunk. Then, the shear wall is located on the edge of the building. Last, the shear wall is located on the edge of the building. ANOVA method is used to analyze the significant difference, i.e., variations in the walls' placement. This research indicates the significant differences in the x-direction shear force and the y-direction moment The shear walls are suggested to be placed according to the building's condition and the earthquake ground site's class to produce an optimal structure to resist earthquake loads.
Bayesian networks approach on intelligent system design for the diagnosis of heat exchanger Dedik Romahadi; Fajar Anggara; Rikko Putra Youlia; Hifdzul Luthfan Habibullah; Hui Xiong
SINERGI Vol 26, No 2 (2022)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/sinergi.2022.2.001

Abstract

The heat exchanger highly influences the series of cooling processes. Therefore, it is required to have maximum performance. Some of the factors causing a decrease in its performance are increased pressure drop in the Plate Heat Exchanger (PHE), decreased output flow, leakage, flow obstruction, and mixing of fluids. Furthermore, it takes a long time to conclude the diagnosis of the performance and locate the fault. Therefore, this study aims to design an intelligent system for the performance diagnosis of the PHE using the Bayesian Networks (BNs) method approach. BNs are applied to new problems that require a new BNs network model. The system was designed using MSBNX and MATLAB software, comprising several implementation stages. It starts by determining the related variables and categories in the network, making a causality diagram, determining the prior probability of the variable, filling in the conditional probability of each variable, and entering evidence to analyze the prediction results. This is followed by carrying out a case test on the maintenance history to display the probability inference that occurs during pressure drop on the PHE. The result showed that the BNs method was successfully applied in diagnosing the PHE. When there is evidence of input in the form of a pressure drop, the probability value of non-conforming pressure-flow becomes 61.12%, PHE clogged at 73.59%, and actions to clean pipes of 70.18%. In conclusion, the diagnosis carried out by the system showed accurate results.
Experimental investigation of course stability on a barge during damaged conditions Suandar Baso
SINERGI Vol 26, No 2 (2022)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/sinergi.2022.2.006

Abstract

The paper presents an experimental investigation of course stability on the barge due to the damage conditions of one or more adjacent void tanks. The effects of various towline lengths and load conditions on the course stability of the barge were taken into account and incorporated with trim and heel conditions. The sway motion, defined as the towline's motion, was captured using the camera, and the yaw motion was measured using the Euler compass. The investigation results revealed that increased towline lengths, flooding locations, and load conditions affect the barge's course stability. The smallest value is the increased sway and yaw amplitudes affected by the flooded condition of one or adjacent two void tanks on the amidship part. The overall sway amplitude on the port side or starboard side increases significantly high, affected by towline length from 1L to 1.5L. Also, the overall yaw amplitude on the port side or starboard side increases significantly high, affected by towline length from 1.5L to 2L. The difference in the increased sway amplitude based on the flooding locations between stern, amidship, and bow parts is less than 10% on the port side and 2% on the starboard side. The difference in the increased yaw amplitude is less than 5% on the port side and 5% on the starboard side. The number of longitudinal bulkheads on the port side and starboard side must be considered for the reduction of the oscillation of the water mass inside the tank to reduce the degradation of the course stability.
How to boost the flow shop manufacturing agility using hybrid Genetic Tabu Search in scheduling Moch Saiful Umam; Jutono Gondohanindijo
SINERGI Vol 26, No 2 (2022)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/sinergi.2022.2.002

Abstract

The hybridization between evolutionary genetic algorithm and tabu search has been proposed in this paper to address flow shop scheduling. It accommodates jobs that need to be rearranged and executed on identical machines serially. High agility is required in the manufacturing process, especially for the garment industry to be able to stand facing competitors. The manufacturing related to scheduling to deliver a product as early as possible, the tardiness, and waiting time are also concerned. A Genetic Algorithm was widely used to deal with this; which finds an optimal solution to the problems because it can obtain a more optimal solution. Unfortunately, it is easy to get stuck in optimum local (early convergence is faster). The tabu search algorithm works as a local explorer to better find and exploit the optimum local area, which can be combined with a Genetic Algorithm. This study aims to minimize the three objectives mentioned above to increase production agility. These strategies are evaluated on Taillard benchmark problems to show the significance of the proposed algorithm. The outcomes prove that the hybrid mechanism can boost the solution quality by 2.75% compared to our previous work and can resolve all of Taillard instances better. It has been proven by a 0.28% percentage relative deviation, which shows the error rate is lower and means better.
An analysis of the effect of the bow entrance angle on ship resistance S. Samuel; Sam Timoty Frans Evan S.; Andi Trimulyono; Muhammad Iqbal
SINERGI Vol 26, No 2 (2022)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/sinergi.2022.2.011

Abstract

Modifying the hull shape is one of the challenges in designing a ship. The angle of the ship's entrance is a significant determinant of the total resistance of the ship. This research aimed to analyze the total resistance of the ship due to changes in the shape of the ship's bow. This research used the Computational Fluid Dynamics (CFD) method with overset mesh technique to predict the ship's total resistance and trim angle. Parameters used in the five-speed numerical simulations. This research indicated that a change in the bow angle of the ship results in a 5% change in the ship's resistance for every change in the bow entrance angle. Therefore, the prediction of total resistance shows significant results in planning conditions. Compared to another bow entrance angle at low Fr, total resistance has no noticeable differences. Angle changes of the entrance of the ship's bow also significantly affected the trim conditions on the ship according to the speed. At Fr 1.03, the stern trim angle tended to decrease dramatically. As a result, the trim by stern under porpoising probably oscillates considerably.
The process mining method approach to analyze users’ behavior of internet in the Local Area Network of Sriwijaya University Muhammad Irfan Jambak; Amrifan S. Mohruni; Muhammad Ihsan Jambak; Endy Suherman
SINERGI Vol 26, No 2 (2022)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/sinergi.2022.2.003

Abstract

The Sriwijaya University internet network management unit does not yet have a standard formulation for implementing Bandwidth Management & Bandwidth Allocation. To provide the best service, they apply the Best-Effort Service concept. As a result, it requires a relatively large network capacity and bandwidth provision so that it has an impact on costs. Therefore, it is necessary to know how users use internet bandwidth as the basic principle of Bandwidth Management & Bandwidth Allocation. This study has completed how to determine the behavior of internet users on the campus LAN as a reason to evaluate internet bandwidth usage. With the Process Mining method, process mapping has been carried out for all access to internet usage from all faculties. As a result, the factors that characterize and need to be considered in bandwidth management are obtained. In order of significance are Total Access Length, Average Variance, Number of User Case IDs, Number of Non-Academic Ports, Number of Academic Ports, Number of Access Frequency, Number of Events, and Number of Ports of Service. 
Effectiveness of capsules installation containing paraffin wax in a solar water heater Muhammad Nadjib; Wahyudi Wahyudi; Fajar Anggara; Yosua Heru Irawan
SINERGI Vol 26, No 2 (2022)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/sinergi.2022.2.012

Abstract

The encapsulation technique is one way to use latent heat storage material in a solar water heater tank. In this technique, several capsules may be arranged in the tank. In this study, the capsules were installed along the cross-section of the tank. There has been no discussion of which part of the capsule position has optimal heat energy with a capsule arrangement. Proper placement of the capsule arrangement can result in optimal thermal energy storage in the tank. This study aimed to investigate the effectiveness of installing capsules in a tank with different positions in terms of thermal energy storage. The study used an active solar water heater. The 24 capsules containing paraffin wax were arranged in a tank. The solar simulator was used as a heat source for the collector, and it was set at 1000 W/m2. The flow rate of water was 2 liters/minute. During the charging process, the water and paraffin wax temperature was recorded. The temperature evolution of water and paraffin wax obtained were used to analyze the thermal energy content. The results showed that the average heating rate for water and paraffin wax was 0.246 °C/min and 0.254 °C/min, respectively, so the capsule arrangement served as a suitable heat exchanger. The capsules installed at the top had an average heating rate increase of 111.4% compared to those at the bottom. Therefore, mounting the capsule at the top of the tank was more effective than placing it at the bottom. 
Seismic performance of moment frames under multiple fling-step pulse ground motions Ade Faisal; Afiful Anshari; Bambang Hadibroto; Ahmad Fahmy Kamarudin
SINERGI Vol 26, No 2 (2022)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/sinergi.2022.2.004

Abstract

The displacement fling-step pulse seldom signatures near-field earthquake in its ground motions. It is well recognized that the near-field ground motion with velocity pulse amplifies the building drift larger than the regular ground motion. Recent findings explain that the building experiences minor damage to collapse is not caused only by the single earthquakes, which in many cases are due to repeated ground motion. The seismic performance of moment frames under the displacement fling-step pulse motion is not studied, particularly when this type of motion applies. Thousands of nonlinear inelastic response history analyses are conducted in order to find out the inter-story drifts, as the engineering demand parameter throughout the incremental dynamic analysis, on the 5 to 20-story moment resisting frames under the influence of multiple ground motions with a fling-step pulse. The special, intermediate, and ordinary types of moment frames are considered, respectively. On average, the evaluation result explains that the intensity measure of multiple ground motions with a fling-step pulse needs 68.37% lower than the single ground motion in order to produce the near collapse inter-story drift. This means the multiple ground motion with fling step pulse increases the probability of near collapse of frames significantly.  
The linkage of water quality measurement the downstream of the Citarum cascade reservoir management Lieza Corsita; Arwin Sabar; Barwin Setiani Muntalif; Indah Rachmatiah S. Salami
SINERGI Vol 26, No 2 (2022)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/sinergi.2022.2.007

Abstract

Cascade Citarum Reservoirs, located in the western part of the island of Java in Indonesia country, cover the main building dams, hydropower, irrigation facilities and other supporting facilities. The study aimed to evaluate the characteristics of the existing condition of the downstream reservoir, including the relation of the water quality and quantity, by using a conceptual model of the Citarum Cascade Reservoir management. The study mostly used the secondary data acquired from Indonesia Power, the Management Bureau of Cirata Dam (BPWC), Perum Jasa Tirta II (PJT) Jatiluhur, the Management Bureau of the Citarum-Ciliwung River Basin (BPDAS Citarum-Ciliwung), and the Water Resource Management Agency of the West Java Province. This research aims to predict the discharge plans R5 and R20 using the Weibull method and the uncertainty of future discharge using the continuous model approach. Furthermore, the multivariate statistical test will analyse the linkage of water quality in reservoir management. To solve the problem of the allocation of the raw water discharge to fulfil the water requirement in the downstream area was developed proportionally in this study, in which the raw water discharge allocations were 46.92 m3/sec, 91.9 m3 /sec and  97.95 m3/sec for Saguling, Cirata, and Jatiluhur, respectively. The tests to determine the relationship between the discharge and water quality using the Discriminant test indicated that the discharge correlates strongly with the parameters such as NH3. BOD and COD. 

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