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All Journal Jurnal Teknik Mesin Journal of Engineering and Technological Sciences Mesin Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse) Jurnal Polimesin SISTEMIK : Jurnal Ilmiah Nasional Bidang Ilmu Teknik
Rachman Setiawan
Faculty Of Mechanical And Aerospace Engineering, Institut Teknologi Bandung
Aerospace Engineering Automotive Engineering Control & Systems Engineering Decision Sciences, Operations Research & Management Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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Journal : Journal of Engineering and Technological Sciences

 1 
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.
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.
Co-Authors Akbar, Musthafa Amir, Muhammad Hisyam Bambang Sugiharto Delima Yanti Sari Dewi Mulyasari Dodi Dodi Fajrianto, Sigit Faza Ahmad I Wayan Suweca Mohammad Rusyad Salim Muhammad Idris Muhammad Idris Naufal Aflah Hibatullah Tito Dwi Prakasa Tito Dwi Prakasa