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All Journal Jurnal Teknik Mesin Journal of Engineering and Technological Sciences Mesin 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 Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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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.
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 Vol. 12 No. 1 (2010): APRIL 2010
Publisher : Institute of Research and Community Outreach - Petra Christian University

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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.
Penerapan Metode Failure Mode, Effect And Criticality Analiysis (Fmeca) Pada Rem Mekanik Sub Komponen Alat Angkut Konveyor Rel Dewi Mulyasari; I Wayan Suweca; Rachman Setiawan
SISTEMIK (Jurnal Nasional Ilmu Teknik) Vol 7 No 1 (2019): SISTEMIK (Jurnal Nasional Ilmu Teknik)
Publisher : Sekolah Tinggi Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (401.503 KB) | DOI: 10.53580/sistemik.v7i1.4

Abstract

Abstrak Pengertian dari FMECA (Failure Mode Effect and Criticality Analysis) adalah suatu metode untuk mengevaluasi ataupun mendesain dari komponen pada suatu sistem dengan cara meneliti potensi modus kegagalannya untuk menentukan dampak yang akan terjadi pada komponen atau sistem kerja. Setiap potensi dari suatu modus kegagalan diklasifikasikan berdasarkan dampak yang dapat ditimbulkan pada keberhasilan sistem tersebut ataupun pada keselamatan pengguna dan peralatan, sehingga dapat diketahui kemungkinan kondisi paling kritis pada komponen yang akan terjadi. Alat transportasi batubara yang terbaru dengan rangkaian gerbong yang digerakkan oleh sistem penggerak luar yaitu konveyor rel. Dalam aplikasinya yang akan digunakan untuk mengangkut batubara di area tambang dari sebuah perusahaan tambang nasional dengan jarak antara loading station dan unloading station sekitar 2,3 km. Konveyor rel terdiri dari 8 sub sistem, salah satunya adalah drive station yang merupakan komponen penggerak dari Konveyor rel yang dipasang pada lokasi-lokasi tertentu. Drive Station sendiri terdiri dari 5 komponen utama, yaitu panel daya listrik, sistem kontrol, unit penggerak, mekanisme pendorong dan rem mekanik. Rem mekanik sebagai komponen utama diharapkan memiliki sub komponen yang memadai. Untuk itu, jurnal ini akan membahas nilai kekritisan pada setiap sub komponen dari rem mekanik dengan menggunakan pendekatan FMECA. Pengumpulan data sebagai awal dari analisis dimulai dengan rancangan dasar dan cara kerja komponen-komponen utama. Tahap selanjutnya adalah penerapan metode FMECA, yang menggabungkan prosedur FMEA (Failure Mode and Effect Analysis) dan CA (Criticality Analysis). Prosedur FMEA terdiri dari penentuan sistem yang akan dianalisis, membuat diagram blok fungsi sistem, mengidentifikasi modus-modus kegagalan dan mengidentifikasi effect yang ditimbulkan oleh modus kegagalan tersebut. Sedangkan prosedur CA terdiri dari dua prosedur, yaitu perhitungan nilai kekritisan dan melakukan pemeringkatan berdasarkan modus kegagalan. Hasil analisis dari 6 sub komponen dari komponen rem mekanik, didapatkan 1 sub komponen yang memiliki nilai kekritisan tertinggi, yaitu pompa rem mekanik dengan nilai kekritisan sebesar 0,633. Kata kunci : Konveyor rel, Drive Station, FMECA, FMEA, CA. Abstract Understanding of FMECA (Failure Mode Effect and Critical Analysis) is a method for evaluating or designing components on a system by examining the potential of Failure Mode to determine the impact that will occur on components or work systems. Every potential of a failure mode is classified based on the impact that can be caused on the success of the system or on the safety of users and equipment, so that the most critical possible conditions in the component will be known. The latest coal transportation with railway coach and driven by an external drive system, rail conveyors. In the application that will be used to transport coal in the mine area from a national mining company with a distance between loading station and unloading station around 2.3 km. Rail conveyors consist of 8 sub-systems, one of the sub-system is a drive station which is a driving component of rail conveyors installed in certain locations. The Drive Station itself consists of 5 main components, namely the electric power panel, control system, drive unit, driving mechanism and mechanical brake. Mechanical brakes as the main component are expected to have adequate sub-components. For this reason, this journal will discuss the critical value of each sub-component of a mechanical brake using the FMECA approach. Data collection as the beginning of the analysis begins with the basic design and workings of the main components. The next stage is the application of the FMECA method, which combines the procedures of FMEA (Failure Mode and Effect Analysis) and CA (Critical Analysis). The FMEA procedure consists of determining the system to be analyzed, making block diagrams of system functions, identifying failure modes and identifying the effects caused by the failure mode. While the CA procedure consists of two procedures, namely the calculation of critical values ??and ranking according to failure mode. The results of the analysis of 6 sub-components of the mechanical brake component, obtained 1 sub-component that has the highest critical value, namely the pump with a critical value of 0.633. Keywords : Konveyor rel, Drive Station, FMECA, FMEA, CA.
Perancangan Anticlimber sebagai Perangkat Crashworthiness untuk Kereta Penumpang Indonesia Rachman Setiawan; Faza Ahmad; Dodi Dodi; I Wayan Suweca
Mesin Vol 29 No 1 (2023)
Publisher : Faculty of Mechanical and Aerospace Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/MESIN.2023.29.1.5

Abstract

Anticlimber merupakan komponen pengaman untuk meningkatkan aspek crashworthiness, yang berfungsi khusus mencegah terjadinya fenomena overriding (tumpang tindih) saat tumburan kereta api yang dapat menyebabkan dampak jatuhnya korban jiwa yang signifikan. Sebagai rangkaian riset dan pengembangan untuk menerapkan teknologi crashworthiness pada kereta penumpang nasional, dikembangkan rancangan anticlimber yang sesuai dengan kereta penumpang produk industri nasional saat ini. Rancangan menggunakan konsep ribs terpisah yang dipasang pada kedua ujung kereta tepat di kanan dan kiri coupler. Anticlimber dirancanga sehingga dapat diintegrasikan dengan mudah tanpa terlalu lama mengganggu operasional KA, dan dapat diproduksi di dalam negeri dan tentunya efektif menahan gerakan vertikal (climbing) antar kereta. Analisis keefektifan rancangan anticlimber ini diuji dengan simulasi beban statik maupun beban dinamik berdasarkan kriteria standar internasional, yaitu BS EN 13227 yang dinilai paling lengkap mengatur aspek crashworthiness di perkeretaapian. Dari analisis kekuatan statik yang telah dilakukan, terbukti bahwa rancangan mampu menahan beban gaya longitudinal 60 tonf (177,6 kN) dan gaya angkat vertikal 12 tonf (588 kN) dan saat terjadi tumburan. Sedangkan dari simulasi dinamik pada kecepatan tumburan 10 m/s (36 km/jam), sesuai kriteria BS EN, dan kecepatan tinggi 20 m/s (72 km/jam), keberadaan anticlimber terbukti memenuhi standar dan mampu menurunkan kemungkinan terjadinya tumpang tindih, dibandingkan jika tanpa antilimber. Dengan hasil ini, dapat disimpulkan bahwa rancangan memiliki prospek yang baik untuk dikembangkan ke purwarupa dan pengujian lapangan, yang menjadi tahap berikutnya dari penelitian ini.
Co-Authors 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 Tito Dwi Prakasa Tito Dwi Prakasa