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All Journal Jurnal Teknik Mesin Jurnal Ilmu Lingkungan JURNAL TEKNOLOGI LINGKUNGAN EKOMBIS REVIEW: Jurnal Ilmiah Ekonomi dan Bisnis Majalah Ilmiah Material, Komponen dan Konstruksi JTERA (Jurnal Teknologi Rekayasa) Jurnal Energi dan Lingkungan (Enerlink) Jurnal Teknologi Dirgantara Jurnal Teknik Mesin Jurnal Teknik Mesin Indonesia Piston: Journal of Technical Engineering Teknomekanik Makara Journal of Technology Eduvest - Journal of Universal Studies Indonesian Journal of Aerospace
Tresna P. Soemardi
Departemen Teknik Mesin, Fakultas Teknik, Universitas Indonesia, Depok 16424, Indonesia
Aerospace Engineering Astronomy Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Electrical & Electronics Engineering Energy Engineering Environmental Science Health Professions Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Neuroscience Physics Social Sciences Other

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Experimental and Numerical Evaluation of Mechanical Properties for Carbon Fiber Reinforced Epoxy LY5052 Composite for Prosthesis Structures Mahfud Ibadi; Yudan Whulanza; Herry Purnomo; David N Vicarneltor; Tresna P Soemardi; Gatot Prayogo
Jurnal Teknik Mesin Vol 15 No 1 (2022): Jurnal Teknik Mesin
Publisher : Politeknik Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30630/jtm.15.1.783

Abstract

Carbon Fiber Reinforced Epoxy is a material that is widely used in the manufacture of prosthesis structures. In this research, the carbon fiber used is plain weave-type carbon, while the matrix used is LY5052 epoxy, LY5052 epoxy has advantages such as low viscosity and long pot life making it possible to manufacture large-sized prostheses. The first step in this research is making specimens using the vacuum infusion method and then cutting the specimens with dimensions referring to ASTM D3039. Furthermore, tensile test experiments were carried out with the results obtained that the maximum stress () was 537.15 MPa. As an evaluation, a tensile test simulation was carried out with Finite element analysis using Abaqus software, the material properties used were the results of a tensile test experiment, in the process the mesh selection was carried out by input sizing control many times this was done to determine the accuracy of the results. The tensile test simulation results with abaqus software are 523.3 MPa when compared to the experimental, the difference is only 2.58%. based on experimental and simulation results, the mechanical properties of the Carbon Fiber Reinforced Epoxy LY5052 Composite material are almost the same, so that in the manufacture of prosthesis the mechanical properties data in this study can be used when performing numerical analysis in the prosthesis design process.
Diffuser Optimation at Exhaust System with Catalytic Converter for 110 cc Mopet with Fluid Flow CFD Simulation Soemardi, Tresna P.; Siswantara, Ahmad Indra; Erwin, Erwin
Makara Journal of Technology Vol. 7, No. 2
Publisher : UI Scholars Hub

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Abstract

Diffuser Optimation at Exhaust System with Catalytic Converter for 110 cc Mopet with Fluid Flow CFD Simulation. CFD simulation used to get behavior of exhaust gas through catalyst, this result will be used to optimize geometry form to perform uniform stream distribution to catalyst, and CFD Simulation will used to analyze backpressure that happened at the model.
Mechanical properties of ramie fiber reinforced epoxy lamina composite for socket prosthesis Soemardi, Tresna P.; Kusumaningsih, Widjajalaksmi; Irawan, Agustinus Purna
Makara Journal of Technology Vol. 13, No. 2
Publisher : UI Scholars Hub

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Abstract

Mechanical properties of ramie fiber reinforced epoxy lamina composite for socket prosthesis. This paper presents an investigation into the application of natural fiber composite especially ramie fiber reinforced epoxy lamina composite for socket prosthesis. The research focuses on the tensile and shear strength from ramie fiber reinforced epoxy lamina composite which will be applied as alternative material for socket prosthesis. The research based on American Society for Testing Material (ASTM) standard D 3039/D 3039M for tensile strength and ASTM D 4255/D 4255M-83 for shear strength. The ramie fiber applied is a fiber continue 100 % Ne14'S with Epoxy Resin Bakelite EPR 174 as matrix and Epoxy Hardener V-140 as hardener. The sample composite test made by hand lay up method. Multiaxial characteristic from ramie fiber reinforced epoxy composite will be compared with ISO standard for plastic/polymer for health application and refers strength of material application at Prosthetics and Orthotics. The analysis was completed with the mode of the failure and the failure criterion observation by using Scanning Electron Microscope (SEM). Based on results of the research could be concluded that ramie fiber reinforced epoxy composite could be developed further as the alternative material for socket prosthesis on Vf 40-50%. Results of the research will be discussed in more detail in this paper.
Analysis of Kancil's Car Knuckle Prototype Soemardi, Tresna P.; Mahmudah, Aida
Makara Journal of Technology Vol. 8, No. 1
Publisher : UI Scholars Hub

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Abstract

Analysis of Kancil’s Knuckle Prototype. The objective of this work is to execute strength analysis of knuckle, which is made from FCD 50, by using static analysis on maximum loading. This maximum loading is obtained from front axle loading calculation on particular operating condition. That is, vehicle is braking while cornering in down hill. From previous vehicle loading calculation, we get a number of loading values on different speed and deceleration. At the end, we get a value of speed and deceleration that guarantee the vehicle safety if it is braking while cornering in down hill. As comparison, loading calculation is executed too for same operating condition on level ground. This is because of different deceleration for each operating condition, 0,5g for operating condition on downhill and 0,2g on level ground. The result shows that maximum loading occurred when vehicle is operated on down hill is larger than on level ground. Study of static focused on quantitative description of loads that act on technical structure in equilibrium.
Optimizing Hot Embossing of Poly(methyl methacrylate) Microfluidic Chip Whulanza, Yudan; Dhira, Pandya; Haryadi, Deni; Soemardi, Tresna P.
Jurnal Teknik Mesin Indonesia Vol. 19 No. 2 (2024): Jurnal Teknik Mesin Indonesia
Publisher : Badan Kerja Sama Teknik Mesin Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36289/jtmi.v19i02.760

Abstract

Microfluidic research become a more important research field in mechanical and bioengineering fields. The application of microfluidic positively relates to the ability to manufacture micro or precision. Nowadays, the manufacturing in this area is aimed at around 100-500 µm. Here, a hot embossing method is reported to realize microchannel with height and width dimensions of 150-300 µm and 600-800 µm, respectively. This study also shows that the margin factor between the mould/dies to the realized dimension is 50-70% and 5-7% for height and width, respectively.
The Analysis Of The Relationship Of Total Quality Management (TQM) And Knowledge Management (KM) On The Organisational PerformanCE Of PT. Birawidha Garda Santosa Eny Kuswidiyanti; Tresna Priyana Soemardi
EKOMBIS REVIEW: Jurnal Ilmiah Ekonomi dan Bisnis Vol 12 No 4 (2024): Oktober
Publisher : UNIVED Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37676/ekombis.v12i4.6421

Abstract

The challenge of managing security services (Satpam) requires guaranteed service quality in order to increase business sustainability and competitiveness. This study aims to determine the influence of Total Quality Management (TQM) to Knowledge Management (KM) and the influence of TQM to Organizational Performance (KO) and the influence of KM as mediation role between TQM and KO, besides to determine the relationship between sub-dimension TQM and KM in the construct of research relationship model. The desain of this research uses field survey approach (questionnaires). The research sites are in operating areas of PT BGS in Indonesia which spread across 11 provinces of Indonesia with population 1014 security personnels. The sampling number in this study is 144 respondents uses proportional random sampling. Analytical methods used in this study are Structural Equation Model test with the help of SMAT Partial Least Square (SmarPLS) app with the stages measurement model evaluation (validity and reliability), structural model evaluation (to determine strength of the R2 relationship between laten exogen variable), measurement model testing and hypothesis testing. The research results show that TQM has a significant positive effect on KM and KO as shown by p-values of 0.000 and 0.010 respectively. KM also has a significant positive effect on KO as indicated by a p-value of 0.000. KM as a mediating variable has an influence as an enabling factor in achieving organizational performance.
Design, simulation, and static testing of an eco-friendly prosthetic foot using ramie-PLA composite Sopiyan, Iyan; Soemardi, Tresna P.; Purnomo, Herry; Polit, Olivier
Teknomekanik Vol. 8 No. 1 (2025): Regular Issue
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/teknomekanik.v8i1.36572

Abstract

This study developed a sustainable lower-limb prosthetic prototype using biodegradable ramie fiber-reinforced PLA composite as its primary material. The design specifically addresses the needs of individuals with limb amputation while prioritizing environmental sustainability. PLA-based composites for structural biomedical applications—particularly those in lower-limb prosthetics—must meet rigorous mechanical and fatigue performance requirements under repetitive loading. This study investigates the development of a transtibial prosthetic foot prototype using a quasi-isotropic lay-up prepreg ramie-PLA composite fabricated via the hot press method. Material characterization was conducted per ASTM standards, and the design was evaluated using the Finite Element Method (FEM). The prototype underwent static testing according to ISO 22675 with a user load criterion. The laminate exhibited an ultimate tensile strength of 48.36 ± 0.95 MPa, an elastic modulus of 4.125 ± 0.25 GPa, and a flexural strength of 62.06 ± 3.43 MPa. FEM results showed that all normal and shear stresses during heel strike (17.78 MPa and 1.71 MPa) and toe-off (12.38 MPa and 5.69 MPa) phases remained below fatigue limits. Experimental static stresses were heel strike (12.72 MPa) and toe-off (20.09 MPa), both within safe operational limits. These findings highlight the structural viability and environmental sustainability of ramie-PLA composites, positioning them as a promising material for next-generation prosthetic foot development.
Analysis of Inventory Control in the Downstream Fuel Supply Chain : An Indonesian Prespective Raymutia, Pandu; Soemardi, Tresna Priyana
Eduvest - Journal of Universal Studies Vol. 4 No. 10 (2024): Journal Eduvest - Journal of Universal Studies
Publisher : Green Publisher Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59188/eduvest.v4i10.38814

Abstract

This research focuses on determining the level of inventory in a downstream supply chain for fuel products in Indonesian oil and gas company prespective. The variability in supply and demand is a problem in maintaining the stability of services to the consumers. High inventory costs that are completely borne by the company are also a problem that needs to be controlled. Therefore, determining inventory levels is very important to mitigate the variability of supply and demand that occurs with optimum inventory costs. This research designs a probabilistic model by considering variability in supply and demand to determine safety stock so that the correct level of Fuel Product inventory at each Storage Point can be determined. This research method is quantitative research based on empirical data. It is hoped that the research results will be able to obtain inventory control which can be taken into consideration by oil and gas company in managing the downstream supply chain of fuel products.
Annealing Effect on Improving the Mechanical Properties of Zirconium Based Biomaterials with the Addition of Yttrium Elements for Bone Plate Application Awwaluddin, Muhammad; Prajitno, Djoko Hadi; Soemardi, Tresna P.; Hastuty, Sri
Piston: Journal of Technical Engineering Vol. 8 No. 1 (2024)
Publisher : Program Studi Teknik Mesin Universitas Pamulang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32493/pjte.v8i1.43200

Abstract

To improve the mechanical properties of biomaterials with zirconium-based alloys, especially on ductility, an annealing process was carried out. The process was carried out at a temperature of 800 oC and holding time for 3 hours in a vacuum chamber which was flowed by high purity argon gas. The composition of the alloy used in this study was Zr6Mo4TixY (x= 0, 1 and 3 %wt). Microstructure observations were carried out using microscope optic and Scanning Electron Microscopy (SEM) and mechanical properties observation using tensile testing. In this study, micro-sized specimens were used and followed the ASTM E8-04 standard with a surface roughness of 1µm. The results showed an increase in the tensile strength value after annealing process and decrease the modulus elasticity. In addition, the grain boundaries of the alloy are getting smaller, this shows the effect of annealing on changes in the properties of the material.
THE COMPARATION OF TWO LAPAN'S PROPELLANTS OF DIFFERENT COMPOSITION Jihad, Bagus H.; Soemardi, Tresna P.; Priadi, Dedi
Indonesian Journal of Aerospace Vol. 5 No. 1 (2007): Vol 5, No.1 Juni (2007)
Publisher : BRIN Publishing

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Abstract

This paper compares two LAPAN'S propellant compositions. The A propellant has a composition of AP/AL/Binder with ratio of 70/10/20, and propellant B has ratio 75/7.5/17.5, both with HTPB base but different curing agent. As comparator of this simulation is RX-1512.01 rocket that has flight tested. The performances which compared are specific impulse and efficiency characteristic. Result shows that the propellant B gives higher specific impulse, however higher losses is, about 5.373 percent. One to be considered is that the propellant B produce combustion temperature higher than propellant A by 200 k, that may influence the rocket structures. Keywords: Impuls specific, characteristic efficiency, propellant, simulation.
Co-Authors Abdul Rohman Farid Agri Suwandi Agus H.S. Reksoprodjo Agus Sasmito Agus Sasmito, Agus Agustinus P. Irawan Agustinus Purna Irawan Ahmad Indra Siswantara Aida Mahmudah Anwar Soefi Ibrahim Arif Dwi Santoso Arif Dwi Santoso Awal Subandar Awal Subandar, Awal Bagus H. Jihad David N Vicarneltor Dedi Priadi Dedi Supriadi Dhira, Pandya Djoko Hadi Prajitno Eny Kuswidiyanti Erwin Erwin Farid, Abdul Rohman Farid, Abdul Rohman Gatot Prayogo Harkali Setyono Haryadi, Deni Hasroel Thayyib Hendri D.S. Budiono Herry Purnomo Herry Purnomo Jihad, Bagus H. Kardono Kardono Kardono Kardono Kholis Ernawati Mahfud Ibadi Muhamad Lutvi Muhammad Awwaluddin Polit, Olivier Raymutia, Pandu Setyono, Harkali Setyono, Harkali Sopiyan, Iyan Sri Hastuty, Sri Sri Mutia R Umar F. Achmadi Widjajalaksmi K. Widjajalaksmi K. Widjajalaksmi Kusumaningsih, Widjajalaksmi Yudan Whulanza