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DESIGN AND DEVELOPMENT OF HUB AND NACELLE STRUCTURE STRUCTURES FOR WIND TURBINE APPLICATIONS firmansyah, hendrix noviyanto; sudarmanto, Sudarmanto sudarmanto
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 10, No 1 (2018): Mei
Publisher : Sekolah Tinggi Teknologi Adisutjipto

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (304.847 KB)

Wind turbine is one of the technology to produce elctricity. Wind turbine consists of wind blade, nacelle, hub and tower. Hub is the structure which connect wind blade to the shaft of the generator to generate electricty.Nacelle is the structure that cover the generator from its environment. Nacelle is not design for strength, so there in no stress analysis for this structure. The purpose of this research is to design and make prototype for hub and nacelle. There are three models for hub, slot model (2 design) and lap joint design, and 1model for nacelle design. hub is selected by the simplicity of process of production and assembly, and by stress analysis. Then the lap joint design is the selected one, so that will be make for prototype. The prototype is made of composite sandwich structure, which is teak wood as its core. The composite sandwich structures is designed for its stiffness criteria.

PERANCANGAN KONFIGURASI STRUKTUR TOWER DAN PEMBUATAN BILAH KOMPOSIT (SANDWICH) UNTUK APLIKASI TURBIN ANGIN Firmansyah, Hendrix Noviyanto; Cahyono, Mohammad Ardi
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 8, No 1 (2016): Mei
Publisher : Sekolah Tinggi Teknologi Adisutjipto

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (196.007 KB)

Tower is a structure vertically designed that the blades and other components attached. The process for structural design for the tower starts by identifying all of the requirements, and then specifies the desired design criteria. The desired design criteria are high strength, low cost, lightweight, does not require a large area, ease of assembly and transport. The proposed tower types are guyed, lattice, and tubular. The analysis result shows that the lattice tower type matches with the design criteria. The next processes are modeling and stress analyzing using MSC Patran/Nastran. The maximum stress is 42 Newton per milimeters square and the Margin of safety (MS) value is 7.815, so the structure is safe. In the process of making the composite sandwich wind blades, it is starts with the creation of the master molding, mold, foam cores and assembly. The results of the three blades were made indicate by a difference in weight. It is caused by the manufacturing system (manual). However, the difference is still relevant or good because it is less than 5 percent.

Estimasi Nilai Faktor Intensitas Tegangan (KI) Tipe Center Crack Dengan Metode Numerik Firmansyah, Hendrix Noviyanto
SENATIK STT Adisutjipto Vol 2 (2016): Peran Teknologi dan Kedirgantaraan Untuk Meningkatkan Daya Saing Bangsa
Publisher : Sekolah Tinggi Teknologi Adisutjipto

Crack on a structure will lead to hazard if it’s ignored, because It’s causing singularity to the tip of the cracked structure where the stress tend to infinity. Stress Intensity Factors(SIF) will determine the behaviour of the cracked structure, and it have have to figure it out. Many methods can estimate or predict the values of the SIF according to the crack mode and the crack types. Numerical mothod such as displacement extrapolation and Virtual crack closure technique is one of those method. Method of displacement extrapolation and VCCT in this research will estimate the value of the KI (SIF)of the mode I (opening mode) center type crack. Modelling and analyzing in a FEM based software is needed to accuire datas to calculate the KI. Nodal displacement and nodal force are those datas. Result shows that the displacement extrapolation method have small eror to the value of KI than the VCCT. Displacement extrapolation method also give simple calculaton than the VCCT. In order for VCCT method to be acurate, remeshing model is needed.

Predicting Stress Intensity Factor (KI) of Single Edge Crack Using Displacement Extrapolation Method Firmansyah, Hendrix Noviyanto
SENATIK STT Adisutjipto Vol 4 (2018): Transformasi Teknologi untuk Mendukung Ketahanan Nasional [ ISBN 978-602-52742-0-6 ]
Publisher : Sekolah Tinggi Teknologi Adisutjipto

Cracks that occur in the structure will be very dangerous if left alone. Cracks can propagate and will eventually cause the structure to fail. Cracks that occur will cause singularity at the end of the crack, and the stress level is very high or reaches without limit (infinity). Stress intensity factor (SIF) is used to determine behavior of structures with crack. One of method that can predict SIF is displacement extrapolation method. Displacement extrapolation methods predict SIF by nodal displacement near end of crack. This research is to predict SIF of a thin plate with a single edge crack of 1.27 mm. The crack mode used in this research is mode I (opening mode) with a tension stress of 60 MPa. Nodal displacement for calculating SIF is taken from result of analyzing the cracked model using Patran / nastran. SIF prediction result from displacement extrapolation then to be compared with the results of analytical calculation.

Kajian Awal Material Pembuat Toe Cap (Safety Shoes) menggunakan Metode Elemen Hingga Firmansyah, Hendrix Noviyanto; Anggoro, Ayub Budhi; Safriana, Eni
Jurnal Rekayasa Mesin Vol 16, No 3 (2021): Volume 16, Nomor 3, Desember 2021
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jrm.v16i3.2955

Toe cap merupakan bagian utama dari safety shoes sebagai pelindung diri dari tertimpa benda saat bekerja. Beragam jenis material dapat digunakan dalam pembuatan toe cap asal memenuhi persyaratan salah satunya adalah mampu menahan beban tekan sebesar 15.000 N. Persyaratan yang lainnya adalah dapat menahan beban impak sebesar 200J. Pada penelitian ini dilakukan kajian mengenai jenis material apa saja yang cocok untuk dijadikan bahan pembuat toe cap. Metode yang digunakan dalam penelitian ini adalah dengan membuat model sederhana dalam perangkat lunak MSC Patran/nastran dan memasukkan material yang selanjutnya dilakukan analisa untuk mendapatkan parameter tegangan, masa dan defleksi toe cap. Material yang digunakan adalah steel, aluminum, carbon/epoxy, eglass epoxy, dan kevlar/epoxy. Analisa menunjukkan bahwa material steel memiliki kemampuan paling baik, namun memiliki berat yang paling besar juga. Selain steel kandidat yang aman lainnya adalah aluminum dan carbon/epoxy. Sedangkan material eglass/epoxy dan kevlar/epoxy menurut kriteria Tsai Wu terjadi kegagalan pada layer 5 &1. Berdasarkan pada nilai keamaan, masa dan defleksi, maka carbon/epoxy adalah pilihan yang terbaik.

DESIGN AND DEVELOPMENT OF HUB AND NACELLE STRUCTURE STRUCTURES FOR WIND TURBINE APPLICATIONS hendrix noviyanto firmansyah; Sudarmanto sudarmanto sudarmanto
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 10, No 1 (2018): Mei
Publisher : Institut Teknologi Dirgantara Adisutjipto

Wind turbine is one of the technology to produce elctricity. Wind turbine consists of wind blade, nacelle, hub and tower. Hub is the structure which connect wind blade to the shaft of the generator to generate electricty.Nacelle is the structure that cover the generator from its environment. Nacelle is not design for strength, so there in no stress analysis for this structure. The purpose of this research is to design and make prototype for hub and nacelle. There are three models for hub, slot model (2 design) and lap joint design, and 1model for nacelle design. hub is selected by the simplicity of process of production and assembly, and by stress analysis. Then the lap joint design is the selected one, so that will be make for prototype. The prototype is made of composite sandwich structure, which is teak wood as its core. The composite sandwich structures is designed for its stiffness criteria.

PERANCANGAN KONFIGURASI STRUKTUR TOWER DAN PEMBUATAN BILAH KOMPOSIT (SANDWICH) UNTUK APLIKASI TURBIN ANGIN Hendrix Noviyanto Firmansyah; Mohammad Ardi Cahyono
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 8, No 1 (2016): Mei
Publisher : Institut Teknologi Dirgantara Adisutjipto

Tower is a structure vertically designed that the blades and other components attached. The process for structural design for the tower starts by identifying all of the requirements, and then specifies the desired design criteria. The desired design criteria are high strength, low cost, lightweight, does not require a large area, ease of assembly and transport. The proposed tower types are guyed, lattice, and tubular. The analysis result shows that the lattice tower type matches with the design criteria. The next processes are modeling and stress analyzing using MSC Patran/Nastran. The maximum stress is 42 Newton per milimeters square and the Margin of safety (MS) value is 7.815, so the structure is safe. In the process of making the composite sandwich wind blades, it is starts with the creation of the master molding, mold, foam cores and assembly. The results of the three blades were made indicate by a difference in weight. It is caused by the manufacturing system (manual). However, the difference is still relevant or good because it is less than 5 percent.

Estimasi Nilai Faktor Intensitas Tegangan (KI) Tipe Center Crack Dengan Metode Numerik Hendrix Noviyanto Firmansyah
SENATIK STT Adisutjipto Vol 2 (2016): Peran Teknologi dan Kedirgantaraan Untuk Meningkatkan Daya Saing Bangsa
Publisher : Institut Teknologi Dirgantara Adisutjipto

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28989/senatik.v2i0.33

Crack on a structure will lead to hazard if it’s ignored, because It’s causing singularity to the tip of the cracked structure where the stress tend to infinity. Stress Intensity Factors(SIF) will determine the behaviour of the cracked structure, and it have have to figure it out. Many methods can estimate or predict the values of the SIF according to the crack mode and the crack types. Numerical mothod such as displacement extrapolation and Virtual crack closure technique is one of those method. Method of displacement extrapolation and VCCT in this research will estimate the value of the KI (SIF)of the mode I (opening mode) center type crack. Modelling and analyzing in a FEM based software is needed to accuire datas to calculate the KI. Nodal displacement and nodal force are those datas. Result shows that the displacement extrapolation method have small eror to the value of KI than the VCCT. Displacement extrapolation method also give simple calculaton than the VCCT. In order for VCCT method to be acurate, remeshing model is needed.

Predicting Stress Intensity Factor (KI) of Single Edge Crack Using Displacement Extrapolation Method Firmansyah, Hendrix Noviyanto
SENATIK STT Adisutjipto Vol 4 (2018): Transformasi Teknologi untuk Mendukung Ketahanan Nasional [ ISBN 978-602-52742-0-6 ]
Publisher : Institut Teknologi Dirgantara Adisutjipto

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28989/senatik.v4i0.257

Cracks that occur in the structure will be very dangerous if left alone. Cracks can propagate and will eventually cause the structure to fail. Cracks that occur will cause singularity at the end of the crack, and the stress level is very high or reaches without limit (infinity). Stress intensity factor (SIF) is used to determine behavior of structures with crack. One of method that can predict SIF is displacement extrapolation method. Displacement extrapolation methods predict SIF by nodal displacement near end of crack. This research is to predict SIF of a thin plate with a single edge crack of 1.27 mm. The crack mode used in this research is mode I (opening mode) with a tension stress of 60 MPa. Nodal displacement for calculating SIF is taken from result of analyzing the cracked model using Patran / nastran. SIF prediction result from displacement extrapolation then to be compared with the results of analytical calculation.

Analisis Tegangan pada Cangkang Helm Keamanan dengan Variasi Jenis Bahan Firmansyah, Hendrix Noviyanto; Roizzy, Fakhrudin Ahmad; Widodo, Rahmat Doni; Kriswanto, Kriswanto; Safriana, Eni
Jurnal Rekayasa Mesin Vol 19, No 2 (2024): Volume 19, Nomor 2, Agustus 2024
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jrm.v19i2.5537

Cangkang helm adalah bagian dari safety helmet yang berfungsi sebagai pelindung utama. Banyak model safety helmet yang terjual dilapangan masih menggunakan bahan polimer sebagai bahan utama, dan masih jarang menggunakan material komposit sebagai bahan pembuatnya. Sehingga pada penelitian ini akan dilakukan kajian jenis material apakah yang sesuai untuk digunakan pada safety helmet selain polimer. Material yang digunakan pada penelitian ini adalah komposit epoksi/rami, komposit epoksi/goni, komposit e-glass fibre/epoksi, dan polimer polypropylene. Pemodelan safety helmet dilakukan menggunakan perangkat lunak Solidworks 2022, sedangkan untuk analisis tegangan dilakukan pada model menggunakan perangkat lunak Ansys 18.1. Tujuan pada penelitian ini adalah menemukan bahan pembuat safety helmet yang terbaik dengan dasar pada margin of safety (MS). Tujuan tersebut merupakan salah satu kebaharuan pada penelitian ini selain desain cangkang safety helmet baru yang beda dari yang di pasaran. Kondisi batas yang menjadi beban muatan model adalah gaya vertikal dari atas permukaan benda searah sumbu –y sebesar 7500 N yang dilakukan pada kondisi diam atau statis. Hasil analisis menunjukkan bahwa model cangkang safety helmet yang memiliki MS tertinggi adalah model yang menggunakan material komposit e-glass fibre/epoksi yaitu sebesar 7, 104. Sedangkan model dengan material epoxy/goni menempati urutan yang ke-2 dengan nilai MS 6,457 kemudian model dengan material polypropylene dengan MS 4,98 dan epoxy /rami dengan MS 3,02. Hasil analisis besarnya massa menunjukkan model helm dengan material dari polypropylene memiliki massa yang paling ringan dengan massa sebesar 0,294 kg, kemudian Epoxy/rami dengan massa sebesar 0,405 kg, Epoxy/goni dengan massa sebesar 0,521dan e-glass fiber/epoxy dengan massa sebear 0,586 kg. Meskipun material e-glass fiber/epoxy memiliki massa yang paling besar, namun nilai MS yang dihasilkan merupakan yang paling tinggi, sehingga dapat direkomendasikan sebagai bahan alternatif untuk membuat safety helmet.

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