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All Journal Jurnal Teknik Mesin Rekayasa Mesin Journal of Engineering and Technological Sciences FLYWHEEL : Jurnal Teknik Mesin Untirta Mesin Ge-STRAM: Jurnal Perencanaan dan Rekayasa Sipil Mechanical Engineering for Society and Industry Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse) Jurnal Polimesin SISTEMIK : Jurnal Ilmiah Nasional Bidang Ilmu Teknik
Rachman Setiawan
Insititut Teknologi Bandung
Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Decision Sciences, Operations Research & Management Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Transportation

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Mechanical Behavior of Various Orthodontic Retraction Springs Setiawan, Rachman; Idris, Muhammad; Prakasa, Tito Dwi
Journal of Engineering and Technological Sciences Vol 43, No 3 (2011)
Publisher : ITB Journal Publisher, LPPM ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (399.083 KB) | DOI: 10.5614/itbj.eng.sci.2011.43.3.5

Abstract

Retraction  spring  is  a  type  of  orthodontic  apparatus  that  is  used  to move a tooth with respect to another by utilizing its spring back effect. It is made of  metallic  wire  formed  to  individual  orthodontic  cases.  A  specific  geometry results in a set of force system, consisting of forces and moments, that provides specific movement effect when it is pre-activated to the adjacent teeth. Currently, orthodontists select its geometry depending on their knowledge and experience. It  is  based  on  separate  and  less-than-comprehensive  literatures  that  not  all orthodontists have access to. It may result in inaccuracies in treating individual tooth  retraction  case.  Engineering  approach  to  estimating  retraction  spring structural  behavior  is  proposed  through  analytical,  numerical  and  empirical methods.  Castigliano  method  is  used  as  the  analytical  approach,  whilst  finite element  method  is  used  as  the  numerical  approach.  The  two  simulation approaches  were  compared  to  the  experiments  to  obtain  the  best  simulation model.  The  behavior  of  the  simulation  models  agree  well  with  those  of experiments. Hence, the simulation models were used to simulate a large number of  geometries  to  form  database  of  structural  behavior  of  retraction  spring  that could be used in the geometry selection by orthodontists.
KARAKTERISTIK MODUL PENYERAP ENERGI IMPAK MEKANISME INTERNAL INVERSION DAN AXIAL SPLITTING Setiawan, Rachman; Amir, Muhammad Hisyam; Sugiharto, Bambang; Fajrianto, Sigit
Mesin Vol 21, No 2 (2006)
Publisher : Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (788.351 KB)

Abstract

The application of crashworthiness technology to a vehicle has a main objective of protecting the passenger or cargo from the effects of impact/collision. One of the strategies is by using impact energy absorbing (IEA) modules. Two of the alternatives of IEA modules are metallic tubes with internal inversion and controlled axial splitting mechanism. This paper presents both numerical and experimental approaches to understand the characteristics of the two mechanisms, before using them in design phase. LS-Dyna was used as the numerical simulation software for drop test case. The result of simulation is presented as the relationships between geometrical parameters and the crashworthiness parameters, e.g. impact energy and response force. Some cases are compared with quasi-static and drop test results.
PENGGUNAAN TEKNIK APROKSIMASI (METAMODELING) UNTUK MENYEDERHANAKAN MODEL ELEMEN HINGGA DALAM PROSES OPTIMASI Setiawan, Rachman
Mesin Vol 20, No 1 (2005)
Publisher : Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (254.821 KB)

Abstract

Complex modelling using Finite element method in iterative optimisation process often yield expensive computation. One of the solution is to replace the expensive finite element analysis with a mathematically simpler model, that is using an approximate relations (Metamodel). Here, the approach is used to characterise the mechanical properties of an anisotropic plate from their corresponding natural frequencies. Radial basis functions model has been chosen for the Metamodel to approximate the finite element model generated in ANSYS 6.1 software. Characterisation process is regarded as an optimisation problem with the objective is to minimise the accumulation of differences between the target frequencies and the updated ones. The use of Metamodel shorten the computation time as well as increase the likelihood of reaching the global minimum. In general, the overall result is reasonably good to predict the mechanical properties of anisotropic plates.
Crashworthiness Design for an Electric City Car against Side Pole Impact Setiawan, Rachman; Salim, Mohammad Rusyad
Journal of Engineering and Technological Sciences Vol 49, No 5 (2017)
Publisher : ITB Journal Publisher, LPPM ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2017.49.5.3

Abstract

Electric vehicles are increasingly popular as an alternative to fossil fuel vehicles. The presence of batteries and electric motors poses different risks in collision accidents. The deformation of the batteries could spark a fire or explosion that in turn could endanger the passengers. The prototype of an Indonesian electric city car is currently being developed, which includes a battery pack located underneath the passenger compartment and electric motors in the front compartment. A crashworthiness design against side pole impact, in accordance with the Euro NCAP standard, was simulated numerically. In order to reduce the risk of battery explosion, an impact energy absorbing structure is proposed for implementation at the sides of the batteries. The structure of the four-passenger hatchback electric city car was modeled using all-shell elements with material properties for common automotive application and analyzed using the finite element method with dynamic plasticity capability. For the preliminary design, the minimum deformation of the batteries that can cause battery explosion was used as the failure criteria. From a number of design alternatives, the use of aluminum foam as impact energy absorber produced sufficient protection for the battery pack against side pole impact, hence effectively reducing the risk to an acceptable limit.
Mechanical Behavior of Various Orthodontic Retraction Springs Rachman Setiawan; Muhammad Idris; Tito Dwi Prakasa
Journal of Engineering and Technological Sciences Vol. 43 No. 3 (2011)
Publisher : Institute for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/itbj.eng.sci.2011.43.3.5

Abstract

Retraction  spring  is  a  type  of  orthodontic  apparatus  that  is  used  to move a tooth with respect to another by utilizing its spring back effect. It is made of  metallic  wire  formed  to  individual  orthodontic  cases.  A  specific  geometry results in a set of force system, consisting of forces and moments, that provides specific movement effect when it is pre-activated to the adjacent teeth. Currently, orthodontists select its geometry depending on their knowledge and experience. It  is  based  on  separate  and  less-than-comprehensive  literatures  that  not  all orthodontists have access to. It may result in inaccuracies in treating individual tooth  retraction  case.  Engineering  approach  to  estimating  retraction  spring structural  behavior  is  proposed  through  analytical,  numerical  and  empirical methods.  Castigliano  method  is  used  as  the  analytical  approach,  whilst  finite element  method  is  used  as  the  numerical  approach.  The  two  simulation approaches  were  compared  to  the  experiments  to  obtain  the  best  simulation model.  The  behavior  of  the  simulation  models  agree  well  with  those  of experiments. Hence, the simulation models were used to simulate a large number of  geometries  to  form  database  of  structural  behavior  of  retraction  spring  that could be used in the geometry selection by orthodontists.
Crashworthiness Design for an Electric City Car against Side Pole Impact Rachman Setiawan; Mohammad Rusyad Salim
Journal of Engineering and Technological Sciences Vol. 49 No. 5 (2017)
Publisher : Institute for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2017.49.5.3

Abstract

Electric vehicles are increasingly popular as an alternative to fossil fuel vehicles. The presence of batteries and electric motors poses different risks in collision accidents. The deformation of the batteries could spark a fire or explosion that in turn could endanger the passengers. The prototype of an Indonesian electric city car is currently being developed, which includes a battery pack located underneath the passenger compartment and electric motors in the front compartment. A crashworthiness design against side pole impact, in accordance with the Euro NCAP standard, was simulated numerically. In order to reduce the risk of battery explosion, an impact energy absorbing structure is proposed for implementation at the sides of the batteries. The structure of the four-passenger hatchback electric city car was modeled using all-shell elements with material properties for common automotive application and analyzed using the finite element method with dynamic plasticity capability. For the preliminary design, the minimum deformation of the batteries that can cause battery explosion was used as the failure criteria. From a number of design alternatives, the use of aluminum foam as impact energy absorber produced sufficient protection for the battery pack against side pole impact, hence effectively reducing the risk to an acceptable limit.
Penyusunan Basis Data Modul Penyerap Impak Internal Inversion Rachman Setiawan; Delima Yanti Sari
Jurnal Teknik Mesin (Sinta 3) Vol. 12 No. 1 (2010): APRIL 2010
Publisher : Institute of Research and Community Outreach, Petra Christian University

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

The use of impact energy absorbing modules is an alternative approach to the application of crashworthiness technology. Comprehensive research of the characteristic of modules through experimental method is very expensive. Alternatively, computer simulation using finite element method can be used. Design process using iterative optimization with finite element method for function evaluation, normally requires high computational cost. Therefore, knowledge based design methodology is proposed in order to perform an efficient optimization process as well as to avoid numerical problems. In this research, knowledge based design is carried out on impact energy absorbing modules, internal inversion. The objectives of this research are to find out the effect of module dimension to its crashworthiness characteristic, to generate an accurate and comprehensive database of internal inversion characteristic and to propose and apply knowledge based design methodology of internal inversion. In this paper, generating process of internal inversion characteristics database is reported. Abstract in Bahasa Indonesia; Penggunaan modul penyerap energi impak merupakan suatu alternatif dari aplikasi teknologi crashworthiness. Penelitian eksperimental yang komprehensif terhadap karakteristik modul tersebut memerlukan biaya yang tinggi, sehingga simulasi komputer yang menggunakan metode elemen hingga menjadi pilihan alternatif. Penggunaan metode elemen hingga dalam proses perancangan melalui optimasi iteratif, biasanya membutuhkan waktu komputasi yang cukup lama. Oleh karena itu, proses perancangan berbasis data (knowledge based design) perlu disusun sehingga proses optimasi rancangan dapat dilakukan secara efisien dan tidak menimbulkan permasalahan numerik. Dalam penelitian ini, perancangan berbasis data dilakukan pada modul penyerap impak mekanisme internal inversion dengan tujuan untuk mengetahui pengaruh dimensi modul terhadap karakteristik crashworthiness-nya, menyusun basis data karakteristik modul yang akurat dan komprehensif, serta menyusun dan menerapkan metodologi perancangan optimum modul berdasarkan basis data. Dalam makalah ini akan dipaparkan proses penyusunan basis data modul penyerap impak internal inversion. Kata kunci: Crashworthiness, internal inversion, erancangan berbasis data.
Fitness For Service Assessment of Bulged Sewage Tank kasda kasda; Hari Din Nugraha; Rachman Setiawan
FLYWHEEL : Jurnal Teknik Mesin Untirta Volume VI, Nomor 2, October 2020
Publisher : Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36055/fwl.v1i1.9142

Abstract

Based on the visual inspection and measurement, bulging was found on the Sewage Tank. There are cracks found in some areas of welded joint on the tank wall. The suitable recommendation needs to be found in order the equipment to be operated safely and reliably. The finite element simulation is aimed at estimating the loading experienced by the tank prior to the damage, and providing recommendation for repair,  replacement or other suitable options. In order to estimate the cause of bulging, several  steps have been carried out. The sewage tank is modelled using a finite-element based software, under a normal up to the maximum allowable loading condition, using a linear-static analysis. Based on finite element simulation, under normal loading  of 0.15 bar with 6 mm thickness, the tank is considered safe with a safety factor is 2.87, compared with a minimum specified Yield Strength of material of 267 MPa. Whereas, under the high loading of 0.4 bar, the safety factor drops to 1.50. Due to estimated loading case that caused the permanent deformation, some of the tank walls experience tensile residual stress. This condition is considered unsafe. Therefore, removal of the residual stress is required.
PENGGUNAAN TEKNIK APROKSIMASI (METAMODELING) UNTUK MENYEDERHANAKAN MODEL ELEMEN HINGGA DALAM PROSES OPTIMASI Rachman Setiawan
Mesin Vol. 20 No. 1 (2005)
Publisher : Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Complex modelling using Finite element method in iterative optimisation process often yield expensive computation. One of the solution is to replace the expensive finite element analysis with a mathematically simpler model, that is using an approximate relations (Metamodel). Here, the approach is used to characterise the mechanical properties of an anisotropic plate from their corresponding natural frequencies. Radial basis functions model has been chosen for the Metamodel to approximate the finite element model generated in ANSYS 6.1 software. Characterisation process is regarded as an optimisation problem with the objective is to minimise the accumulation of differences between the target frequencies and the updated ones. The use of Metamodel shorten the computation time as well as increase the likelihood of reaching the global minimum. In general, the overall result is reasonably good to predict the mechanical properties of anisotropic plates.
KARAKTERISTIK MODUL PENYERAP ENERGI IMPAK MEKANISME INTERNAL INVERSION DAN AXIAL SPLITTING Rachman Setiawan; Muhammad Hisyam Amir; Bambang Sugiharto; Sigit Fajrianto
Mesin Vol. 21 No. 2 (2006)
Publisher : Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

The application of crashworthiness technology to a vehicle has a main objective of protecting the passenger or cargo from the effects of impact/collision. One of the strategies is by using impact energy absorbing (IEA) modules. Two of the alternatives of IEA modules are metallic tubes with internal inversion and controlled axial splitting mechanism. This paper presents both numerical and experimental approaches to understand the characteristics of the two mechanisms, before using them in design phase. LS-Dyna was used as the numerical simulation software for drop test case. The result of simulation is presented as the relationships between geometrical parameters and the crashworthiness parameters, e.g. impact energy and response force. Some cases are compared with quasi-static and drop test results.
Co-Authors Akbar, Musthafa Amir, Muhammad Hisyam Asep Indra Komara Bagus Budiwantoro Bambang Sugiharto Bambang Sugiharto Dedy Ariefijanto Delima Yanti Sari Dewi Mulyasari Dodi Dodi Fajrianto, Sigit Faza Ahmad Hari Din Nugraha I Wayan Suweca Indrawanto Kariem, M. Agus Kasda, Kasda Leonardo Gunawan, Leonardo Mohammad Rusyad Salim Muhamad Abdurrochman Muhammad Hisyam Amir Muhammad Idris Muhammad Idris Muzakki, Sofyan Naufal Aflah Hibatullah Sigit Fajrianto Tito Dwi Prakasa Tito Dwi Prakasa Vani Virdyawan