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All Journal Mechatronics, Electrical Power, and Vehicular Technology Journal of Engineering and Technological Sciences Padjadjaran Journal of Dentistry Mesin
Tatacipta Dirgantara, Tatacipta
Lightweight Structures Research Group, Aeronautics & Astronautics Department Faculty of Mechanical and Aerospace Engineering, Institut Teknologi Bandung
Biochemistry, Genetics & Molecular Biology Dentistry Electrical & Electronics Engineering Engineering Health Professions Immunology & microbiology Mechanical Engineering Medicine & Pharmacology Public Health

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Lessons Learned from Rapid Development of CPAP Ventilator Vent-I during Covid-19 Pandemic in Indonesia Syarif Hidayat; Jam'ah Halid; Tatacipta Dirgantara; Mipi Ananta Kusuma; Hari Utomo; Reza Widianto Sudjud; Ike Sri Rejeki; Sandro Mihradi; Sri Raharno; Dadang Rukanta; Hari Tjahjono
Journal of Engineering and Technological Sciences Vol. 52 No. 5 (2020)
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.2020.52.5.11

Abstract

Here, lessons learned during the development of the CPAP ventilator 'Vent-I', aimed to help COVID-19 patients with breathing difficulties, are presented. Within only weeks, the Vent-I was developed, complying with functionality, safety and reliability requirements and passing the clinical trial. It was then distributed to hospitals all over Indonesia. Two billion rupiahs were raised through crowdfunding within one week. When the project was officially closed, more than one thousand Vent-I devices had been distributed and more than twelve and a half billion rupiahs had been raised. Currently, commercialization and mass production of the device have been started. From this project several lessons can be learned. First and foremost, the spirit of gotong royong"“ sincere collaboration within the community to help each other "“ is still firmly rooted within the people and the society of Indonesia. Noble values, i.e. sincerity, sensitivity and concern about the needs of the community, willingness to serve voluntarily and public trust, made the team dare to try and face failure. The spirit of social entrepreneurship, willingness to listen to the user and collaboration with the relevant authority can accelerate development process. The availability of knowledge and skills that constitute an innovation ecosystem in Bandung, supported by business, social institutions and government, was also a key success factor..
Experimental Work for Bar Straightness Effect Evaluation of Split Hopkinson Pressure Bar Afdhal Afdhal; Leonardo Gunawan; Tatacipta Dirgantara
Journal of Engineering and Technological Sciences Vol. 53 No. 6 (2021)
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.2021.53.6.13

Abstract

Bar straightness is one of several factors that can affect the quality of the strain wave signal in a Split Hopkinson Pressure Bar (SHPB). Recently, it was found that the bar components of the SHPB at the Lightweight Structures Laboratory displayed a deviation in straightness because of manufacturing limitations. An evaluation was needed to determine whether the strain wave signals produced from this SHPB are acceptable or not. A numerical model was developed to investigate this effect. In this paper, experimental work was performed to evaluate the quality of the signal in the SHPB and to validate the numerical model. Good agreement between the experimental results and the numerical results was obtained for the strain rates and stress-strain relationship for mild steel ST37 and aluminum 6061 specimen materials. The recommended bar straightness tolerance is proposed as 0.36 mm per 100 mm.
Stress distribution analysis of seat and non-seat preparation design for orden cast post using 2D finite element method Aldilla Miranda; Gantini Subrata; Zulia Hasratiningsih; Tatacipta Dirgantara
Padjadjaran Journal of Dentistry Vol 23, No 3 (2011): November 2011
Publisher : Faculty of Dentistry Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2511.83 KB) | DOI: 10.24198/pjd.vol23no3.14032

Abstract

The post is used to retain a core that supports the definitive restoration. One of the important factors in the prognosis of post-endodontic restoration system is the post space preparation design which effects to the distribution of stresses. The purpose of this study was to analyze the effect of post space preparation design at the cervical area of the root to the stress distribution on static loading using (two dimensions) finite element method. This was a numeric simulation study using two 2D digital models: seat and non-seat design of maxillary central incisors using commercial software of finite element. The procedures of pre-processing, solution, and post-processing were used to evaluate the distribution of internal stress caused by static loading 110 N which was applied at 135° angle with tooth longitudinal axis on the palatal surface of the core. Both models of restoration with cast post-core of Orden alloy were divided into 15,400 triangular elements. This study showed that the stress distribution from the loading location to the location of stress concentration and the value of maximum stress at cervical part of the root at non-seat design was lower than the seat design (seat design 3.69 times greater than non-seat). This study proved that non-seat design distributes stress better than seat design.
Karakterisasi Sifat Mekanik Mild Steel St37 dan High Strength Steel CR420LA pada Laju Regangan Menengah Leonardo Gunawan; Agustinus Dimas; Annisa Jusuf; Tatacipta Dirgantara; Ichsan Setya Putra
Mesin Vol. 25 No. 2 (2016)
Publisher : Mesin

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Abstract

Untuk mendapatkan prediksi respon yang cukup akurat dalam analisis tabrakan kendaraan darat, dimana terjadi pembebanan dan deformasi struktur dalam waktu yang cepat, diperlukan data sifat mekanik material pada berbagai laju regangan. Makalah ini menyajikan pengukuran sifat mekanik Mild Steel St37 dan High Strength Steel CR420LA pada kondisi kuasi-statik dengan laju regangan 0.001 s-1 dan pada kondisi dinamik dengan laju regangan 0.1 s-1, 1 s-1, 10 s-1, dan 100 s-1. Dalam pengujian, data beban terhadap waktu direkam menggunakan load cell, sedangkan data perpindahan terhadap waktu diperoleh menggunakan ekstensometer untuk uji kuasi-statik dan menggunakan kamera kecepatan tinggi diikuti dengan perhitungan regangan berdasarkan metode Korelasi Citra Digital (KCD) untuk kondisi dinamik. Hasil pengukuran menunjukan bahwa baja St37 dan CR420LA termasuk ke dalam jenis material yang sensitif terhadap laju regangan, dimana tegangan luluh material meningkat dengan naiknya laju regangan pada material.
PERANCANGAN MEKANISME MOTOR STIRLING BERKAPASITAS 1 kW Toto Hardianto; Djoko Suharto; Tatacipta Dirgantara
Mesin Vol. 16 No. 2 (2001)
Publisher : Mesin

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Abstract

The Stirling engine is an external combustion engine for converting the thermal energy into mechanical energy. This engine uses a Stirling cycle, which theoretically could have high thermal efficiency, which is as high as a Carnot cycle operating at a similar condition.This paper deals with a design process of Stirling engine's mechanism stressing on the kinematics and dynamics aspects. Thermodynamics and geometry parameters are the inputs required for designing the Stirling engine's mechanism. Material aspect has not been included in the design. The main parameters analyzed are: engine's rotational speed, working temperature, cylinder's pressure, inertial forces and power output.The results of the design are useful to give an overall picture of the main dimensions of a Stirling engine. Detail calculations are still needed for more advanced design.
Development of a 3D Gait Measurement Protocol for Amputees Walking on Treadmill Andi Isra Mahyuddin; F Ferryanto; Indria Herman; Sandro Mihradi; Tatacipta Dirgantara
Mesin Vol. 26 No. 1 (2017)
Publisher : Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/MESIN.2017.26.1.4

Abstract

Walking motion is actually a complex activity since it involves many body parts, especially the lower limb. Due to the needs for gait analysis in many medical applications, Biomechanics Research Team at ITB has developed an affordable optical motion analyzer to measure motions of subject walking over ground. However, the needs for multicycles gait data is better met by measuring subjects walking on treadmill. This paper discusses the modification of the developed motion analyzer to accommodate data acquisition of subject walking on treadmill, including those of transfemoral amputees. Seven markers, two 95 fps cameras, a dual-channel Camera Link Acquisition NI PCIe-1430 frame grabber, and a workstation are employed in the optical motion analyzer system. The speed displayed on the treadmill is evaluated. Additional equipment such as the modified hydraulic engine crane and the body harness are introduced to ensure the safety of amputees and avoid the risk of falling down while walking on the treadmill. The modified motion analyzer system is then used to obtain gait parameters of normal (37 males and 31 females) and three amputee subjects. The gait parameters of normal subjects in the treadmill walking shows that there is a decrease in the stride length and range of motion, and increase in the cadence due to walking adaptation. There are also phase shifting and increase in the range of motion for amputee subjects compared to the normal subjects which imply that there is an extra work done by the residual limb in doing walking movement and the amputee subjects try to balance their walking on the treadmill.
Design and Fabrication of Ball Punch Deformation Test of Metallic Sheet Material Citra Asti Rosalia; Satrio Wicaksono; Tatacipta Dirgantara; Arif Basuki; Ichsan Setya Putra
Mesin Vol. 27 No. 1 (2018)
Publisher : Mesin

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Abstract

Predicting the behavior of sheet metal in forming process is very important to avoid material failure. The strain limit of sheet metals before tearing occurs is attainable in Forming Limit Diagram (FLD), which can be obtained experimentally or theoretically. Experimentally, FLD of a sheet metal can be achieved by performing ball punch deformation test. Unfortunately, commercially available ball punch deformation test apparatus is still very expensive. In this paper, the design, fabrication and testing process of more affordable ball punch deformation test apparatus is be presented. The ball punch apparatus has indenter's diameter of 22.4 mm, which capable to tear 0.2-2.0 mm thick specimen blanks with maximum capacity of 200 kN. The test results are then compared with other commercially available ball punch deformation test apparatus results in the literature, and show very good agreement.
Pengaruh Faktor dan Mekanisme Pengerasan Regangan pada Baja Hadfield Haris Wahyudi; Tatacipta Dirgantara; Rochim Suratman; Aditianto Ramelan
Mesin Vol. 27 No. 2 (2018)
Publisher : Mesin

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Abstract

Abstract. Hadfield steel has good toughness, ductility, impact resistance, wear resistance and has excellent work hardening. It has a carbon content of 1-1.4% and manganese 11-14% by weight, a ratio of approximately 1:10. The potential for increasing its strength against strain hardening can be seen from the wide range of plastic strength, 379 MPa yield strength and 965 MPa tensile strength. The hardening of Hadfield steel strain depends on the type loading which affect the dislocation slip mechanism, twinning deformation, and the interaction between slip and twinning. The study of high strain rates in Hadfield steel is quite interesting and still relevant to date, although there have been many papers published. Hadfield cast steel which has a relatively low hardness, can be increased its hardness by treatment and high work hardening (high strain rate). There are factors that influence the hardness of Hadfield steel include alloying, solid solution process and high work hardening. Nitrogen as austenite stabilizer is important for work hardening, chromium and vanadium are added to increase hardness because it will form carbides, and aluminum is added to increase wear resistance. High strain rate deformation is applied to provide improved strength because of propensity of twinning mechanism is likely to occur. Optimum strain hardening by twinning mechanism can only be achieved at critical impact energy. Explosive hardening generates small deformations but provides significant changes in mechanical properties.Abstrak. Baja Hadfield memiliki sifat ketangguhan, keuletan, ketahanan impak, ketahanan terhadap aus dan memiliki work hardening yang sangat baik. Memiliki kandungan unsur karbon 1-1,4% dan mangan 11-14% berat, rasio kurang lebih 1:10. Potensi peningkatan kekuatan terhadap pengerasan regangan, dapat dilihat dari rentang kekuatan plastis yang lebar, kekuatan luluh 379 MPa dan kekuatan tarik 965 MPa. Pengerasan regangan baja Hadfield tergantung kepada proses pembebanan melalui mekanisme slip dislokasi, deformasi twinning, serta interaksi antara slip dan twinning. Kajian tentang high strain rate pada baja Hadfield menjadi topik yang cukup menarik dan relevan, meskipun telah banyak publikasi yang dihasilkan. Baja Hadfield yang memiliki kekerasan relatif rendah, mampu ditingkatkan nilai kekerasannya melalui rekayasa perlakuan panas dan deformasi plastis secara cepat. Beberapa faktor yang mempengaruhi kekerasan baja Hadfield antara lain bahan paduan, perlakuan panas dan proses pengerasan regangan yang diberikan. Nitrogen sebagai penstabil austenit penting untuk pengerjaan dingin, kromium dan vanadium ditambahkan untuk meningkatkan kekerasan karena akan membentuk karbida, dan aluminum ditambahkan untuk meningkatkan ketahanan aus. Deformasi kecepatan regangan tinggi pada Hadfield memberikan peningkatan kekuatan lebih baik karena mekanisme twinning lebih dominan. Pengerasan regangan optimum oleh mekanisme twinning hanya dapat dicapai pada energi impak kritikal. Explosive hardening menghasilkan deformasi yang relatif kecil tetapi memberikan perubahan sifat mekanik yang signifikan.
Analisis Struktur Octet-Truss Lattice Sebagai Struktur Penyerap Energi Pada Subfloor Helikopter I Ketut Adi Sentana Putra; Sigit Puji Santosa; Tatacipta Dirgantara; Annisa Jusuf
Mesin Vol. 27 No. 2 (2018)
Publisher : Mesin

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Abstract

Semakin meningkatnya penggunaan helikopter dalam transportasi udara menyebabkan semakin meningkatnya peluang terjadinya kecelakaan. Sebagian besar kecelakaan pada helikopter adalah jatuh dan merusak bagian bawah struktur badan helikopter (subfloor) akibat beban dinamik. Untuk meningkatkan keamanan dan mengurangi resiko terjadinya cedera fatal pada penumpang perlu dilakukan kajian crashworthiness pada helikopter.Salah satu cara manajemen energi serap pada struktur helikopter terhadap tabrakan adalah dengan mengoptimalkan struktur penyerap energi. Peningkatan energi serap dapat dilakukan dengan menggunakan geometri lattice sebagai struktur penyerap energi. Struktur lattice merupakan solusi yang menjanjikan untuk dipergunakan sebagai struktur penyerap energi impak. Tugas akhir ini difokuskan untuk melakukan studi mengenai karakteristik respon octet-truss lattice ketika dikenakan beban impak dan pengaplikasiannya pada struktur subfloor helikopter dengan metode elemen hingga. Analisis  numerik untuk studi perbandingan konfigurasi struktur cruciform, struktur octet-truss lattice bertumpuk uniform dengan octet-truss lattice bertumpuk double taper sebagai struktur penyerap energi. Dengan adanya teknologi manufaktur aditif, struktur lattice dapat dengan mudah diproduksi menggunakan teknik selective laser sintering (SLS). Material yang digunakan dalam simulasi numerik berupa paduan alumunium AlSi-12 hasil manufaktur SLS. Hasil konfigurasi lattice akan digunakan pada subfloor helikopter dan  dibandingkan dengan struktur cruciform. Setelah dilakukan simulasi numerik dengan metode elemen hingga akan dilihat struktur mana yang mempunyai specific energy absorb tertinggi . Hasil ini menunjukkan bahwa struktur lattice dengan konfigurasi double taper memiliki specific energy absorb tetinggi sebesar 34.44 kJ/kg. Dari hasil pemodelan elemen hingga didapat konfigurasi octet-truss lattice dengan double taper memiliki potensi yang besar sebagai struktur penyerap energi dimasa depan.
KAJI NUMERIK GROUND PAD SHOE KENDARAAN TEMPUR DENGAN MODEL MATERIAL HYPERELASTIC Angki Apriliandi Rachmat; Tatacipta Dirgantara; I Wayan Suweca; Yati Mardiyati
Mesin Vol 30 No 1 (2024)
Publisher : Faculty of Mechanical and Aerospace Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/MESIN.2024.30.1.5

Abstract

One of the important components on a combat vehicle is the ground pad shoe (GPS) or track pad. GPS that has been developed at this time mostly uses rubber material. Rubber raw materials themselves are found in Indonesia in large amount. Indonesia left 3 million tonnes of natural rubber unprocessed in 2018. On the other hand, natural rubber research is quite expensive and takes a long time to become a product. To make rubber products is needed special molds and tests. To solve the high costs and long time involved in rubber research, it is necessary to carry out numerical research. In this study, a numerical study of GPS rubber for combat vehicles was carried out with a hyperelastic material model. The research was conducted experimentally and numerically. Tensile testing is carried out on imported GPS samples which are then used as comparison data for numerical studies. The Mooney-Rivlin, Neo-Hookean, Yeoh, and Ogden hyperelastic models were varied to get the stress and strain values ​​closest to the experimental test. The results of the numerical study show that the best hyperelastic model for the imported GPS rubber model is the Neo-Hookean model. The tensile strength of GPS according to the experimental tensile test results is 16.93 MPa, while the result of the finite element method (FEM) is 16.75 MPa. The GPS modulus 200% according to the experimental tensile test results is 14.7 mm/mm, while the FEM result is 15.3 mm/mm. The difference between the FEM and experimental test values ​​for tensile strength and modulus 200% are below 5%. Maximum stress on GPS is 4,4 MPa and safety factor 3,8.
Co-Authors AA Sudharmawan, AA Abd. Rasyid Syamsuri Aditianto Ramelan Afdhal Afdhal Agustinus Dimas Aldilla Miranda Andi Kuswoyo Angki Apriliandi Rachmat Annisa Jusuf Annisa Jusuf Annisa Jusuf, Annisa Cakranegara, Pandu Adi Citra Asti Rosalia Dadang Rukanta Dimas, Agustinus Djoko Suharto F Ferryanto Ferryanto, F Gantini Subrata Gantini Subrata, Gantini Golfianto, Hari Hardianto, Toto Hari Golfianto Hari Tjahjono Hari Utomo Haris Wahyudi Herman, Indria Hermawan Judawisastra I Ketut Adi Sentana Putra I Wayan Suweca I Wayan Suweca Ichsan Setya Putra Ike Sri Rejeki Indria Herman Jam'ah Halid Janti Rusjanti, Janti Leonardo Gunawan Leonardo Gunawan, Leonardo Mahyuddin, Andi Isra Mardiyati, Mardiyati Mardiyati, Yati Mihradi, Sandro Mipi Ananta Kusuma Muhammad Hamzah Farrasamulya Nunung Rusminah Nur Ridhwan Muharram Putra, Ichsan Setya Rachmat, Angki Apriliandi Ramadhan, Muhammad Hisyam Reza Widianto Sudjud Rochim Suratman RR. Ella Evrita Hestiandari Santosa, Sigit Puji Satrio Wicaksono Satrio Wicaksono Satrio Wicaksono Setya Putra, Ichsan Sri Raharno Suharto, Djoko Syarif Hidayat Widia Hafsyah Sumarlina Ritonga, Widia Hafsyah Sumarlina Zulia Hasratiningsih Zulia Hasratiningsih, Zulia