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Muhayat, Nurul
Department Of Mechanical Engineering, Universitas Sebelas Maret, Surakarta 57126,
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An Innovative Design of Magnetorheological Lateral Damper for Secondary Suspension of a Train Masa'id, Aji; Ubaidillah, Ubaidillah; Lenggana, Bhre; Muhayat, Nurul; Wibowo, Wibowo; Mazlan, Saiful
http://dx.doi.org/10.31427/IJSTT.2019.2.2.2
Publisher : Unijourn Publisher

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

Abstract

This article delivered an innovative idea of a magnetorheological (MR) damper for secondary suspension of train bogie. The valve inside MR damper adopted meandering of both fluid flow and magnetic flux for improving magnetization area. In this work, the design and working principle of the MR valve were presented including a mathematical model to predict the pressure drop. In the early stage, the finite element method magnetics software (FEMM) simulation could predict the magnetic flux density across the passages. Based on the amount of magnetic flux, the corresponding shear yield stress could be determined from its basic physical properties. The mathematical model covered pressure drop prediction for both off-state and on-state. The FEMM simulation results showed that the meandering flow and serpentine flux design could improve the effective area of magnetization. Consequently, the pressure drop of the valve could have wider ranges and achieve a high value of pressure differences. This result could be potentially improving the performance of the damping forces of the lateral damper in a bogie train.
Pengaruh volume Zn terhadap kekerasan dan struktur mikro pada friction stir processing aluminium AA 1100 Alvia Restu Putra Utama; Nurul Muhayat; T Triyono
Jurnal Teknik Mesin Indonesia Vol 14 No 2 (2019): Jurnal Teknik Mesin Indonesia
Publisher : Badan Kerja Sama Teknik Mesin Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1654.557 KB) | DOI: 10.36289/jtmi.v14i2.129

Abstract

Friction Stir Processing (FSP) is a development of FSW mechanism on surface hardening process such as in aluminium. The using of aluminium and its alloy were globally used as machining part, it because aluminium and its alloy are light and able to forming. Goal of this study are learn the effect of Zn volume on mechanical and physical properties of aluminium alloy 1100. Mechanical properties are tested by the Vickers Hardness Testing, while the physical properties are observe by macrostructures testing, microstructures testing and SEM. The variation are 22 mm3, 45 mm3, 67 mm3, 90 mm3 of Zn volume and without Zn. Rotating speed of tool, dwell time, and plunge depth are in same conditions. Observation result of SEM and mapping show that Zn were not spread well on SAZ. This condition prove by the high of Zn in the edge zone of tool by EDS observation. The result of hardness testing show that the increasing of Zn volume will increase the hardness properties. The highest result of hardness testing in FSP AA1100 is 87.5 HV with the most Zn volume variation, while without Zn is 44.7 HV.
Pengaruh plunge depth dan preheat terhadap sifat mekanik sambungan friction stir welding polyamide Budy Nugroho; Triyono .; Nurul Muhayat
Jurnal Teknik Mesin Indonesia Vol 11 No 2 (2016): Jurnal Teknik Mesin Indonesia
Publisher : Badan Kerja Sama Teknik Mesin Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (474.987 KB) | DOI: 10.36289/jtmi.v11i2.57

Abstract

Friction stir welding is a joining method that utilizes heat caused by the friction between workpiece material and pin. It employs several parameters such as tool rotational speed, welding speed, and plunge depth. The objective of this research is to investigate the effect of plunge depth and preheat on the mechanical properties of friction stir welding polyamide materials. This research used the plunge depths of 5.6 mm, 5.65 mm, 5.7 mm, and 5.75 mm. The parameters maintained to be constant were tool rotational speed of 620 rpm, welding speed of 7.3 mm/minutes, and tool tilt angle of 20. Preheat of 1700C was done as well non preheat method to compare of both methods.The maximum tensile and bending strength was obtained at the tool plunge depth of 5.7 mm with preheat. The value of maximum tensile and bending is 27,3 Mpa, and 75,7 Mpa. The optimization of tool plunge depth and preheat made the stirring better so that the molten material could spread all over weld region. The spreading of the molten material minimized void or defect in the weld region. As a result, the mechanical characteristic of joint increased.
PENGARUH WAKTU PENGELASAN TERHADAP REAKSI ANTARMUKA PADA SAMBUNGAN ALUMINIUM AL6061 DAN BAJA GALVANIS Sigit Edy Purwanto; Mustakim Mustakim; Triyono Triyono; Nurul Muhayat
KURVATEK Vol 4 No 2 (2019): November 2019
Publisher : Institut Teknologi Nasional Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33579/krvtk.v4i2.1147

Abstract

AbstrakBahan bakar merupakan kebutuhan yang sangat penting bagi alat transportasi. Saat ini, cadangan bahan bakar fosil semakin berkurang. Untuk menghemat bahan bakar diperlukan alat transportasi yang ringan. Konstruksi yang ringan dapat diperoleh dengan menggabungkan dua atau lebih jenis material. Jenis sambungan yang sesuai untuk mendapatkan konstruksi yang ringan adalah sambungan las. Penelitian ini bertujuan untuk mengetahui sifat mampu las antara baja galvanis dengan aluminium Al6061. Metode pengelasan yang digunakan adalah Resistance Spot Welding (RSW). Sifat mampu las dari kedua material dapat diketahui dari  jenis senyawa intermetalik yang terbentuk pada antarmuka lasan. Hasil penelitian ini menunjukkan bahwa reaksi antarmuka yang terbentuk untuk waktu pengelasan 4 dan 5 siklus adalah senyawa intermetalik FeAl dengan ketebalan masing-masing 19,25 μm dan 10,52 μm, untuk waktu pengelasan 6 siklus adalah senyawa intermetalik FeAl3 dengan ketebalan 8,07 μm. Kekeraran tertinggi 623,1 HV0.1 dan kekerasan terendah 572,2 HV0.1. Kata kunci: Aluminium Al6061, Baja Galvanis, RSW, Senyawa Intermetalik AbstractFuel is a very important in transportation. Unfortunately, the amount of fossil fuel reserve is decreasing. Using lightweight material for vehicle is one way to save fossil fuel. Lightweight construction can be obtained by combining two or more types of material. The right type of connection to get a lightweight construction is a welded joint. This study aimed to determine the properties of weldability between galvanized steel and aluminum Al6061. The welding method used was Resistance Spot Welding (RSW). The weldability of the two materials could be seen from the types of intermetallic compounds formed at the weld interface. The results of this study indicated that the formed interface reaction was FeAl intermetallic compound layer with a thickness of 19,25 μm and 10,52 μm respectively for 4 and  5 cicles of welding time, and FeA3 intermetallic compound layer with a thickness of 8,07 μm for 6 cycles of the welding time The highest hardness was 623.1 HV0.1 and the lowest hardness was 572.2 HV0.1. Keywords: Aluminum, Galvanized Steel, RSW, Intermetallic Compound
Perancangan Dinamometer Skala Kecil untuk Pengujian Karakteristik Gesek Bahan Blok Rem Kereta Api Rizal Akhmad Bukhori; Eko Surojo; Nurul Muhayat
Jurnal Nasional Teknologi Terapan (JNTT) Vol 2, No 3 (2018): NOVEMBER
Publisher : Penelitian dan Pengabdian Kepada Masyarakat Sekolah Vokasi Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (277.729 KB) | DOI: 10.22146/jntt.44937

Abstract

The brake blocks are components of the railway braking system that are useful for reducing speed or stopping the railway. In the development of railway brake block material needs a device that capable of testing the characteristics of the brake block material. One of the important characteristics of the brake block material is the frictional characteristic. The method of testing the frictional characteristics of existing brake blocks include using the pin on disc method, direct testing on the railway and using a full-scale dynamometer. The full-scale dynamometer has advantages than other methods because it can test specimens according to the actual railway braking conditions in a short time and less preparations. However, with the same specimen size as the original, the cost of making the specimen and the full-scale dynamometer become expensive. Therefore, to reduce the cost of making device and test specimens, this study will design the dynamometer small-scale brake block testing. This paper use Pahl and Beitz design method which divides the design into four stages: clarification of the task, conceptual design, embodiment design, and detail design. This dynamometer is designed by considering function designs, structures, and forces that are adapted to the brake block contact pressure according to the original conditions. This dynamometer is designed to vary material, wheel speed, and contact presssure with the output of measurement of friction coefficient of brake block material. Brake block test specimens have a reduced size with a 1: 4 scale from their original size. The results obtained from this research are engineering drawings and dynamometer test model of railway braking.
ANALISIS PENGUJIAN POROSITAS TERHADAP HASIL POST CURING KOMPOSIT KAMPAS REM Herru Santosa Budiono; Eko Surojo; Nurul Muhayat; Ikhwan Taufik
Journal of Mechanical Engineering Vol 4, No 2 (2020): Journal of Mechanical Engineering
Publisher : Universitas Tidar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31002/jom.v4i2.3414

Abstract

Bahan pembuatan kampas rem biasanya terbuat dari bahan asbestos, namun bahan tersebut memiliki banyak efek negatif terutama untuk kesehatan. Karena itu dikembangkan sebuah material yang ramah lingkungan dan juga memenuhi syarat untuk bahan kampas rem. Penggunaan material alam yaitu serat cantula yang dipadukan dengan phenolic resin dan juga bahan lainnya menghasilkan sebuah komposit kampas rem yang tidak kalah kuat dan juga ramah lingkungan. Bahan phenolic resin akan menghasilkan gas ammonia ketika bahan itu terkena panas. Gas ammonia yang terbentuk didalam material dapat mengakibatkan internal defect yang dapat menurunkan kekuatan material. Untuk itu dilakukan treatment tambahan untuk menghilangkan gas ammonia. Post curing adalah sebuah treatment yang berfungsi untuk meningkatkan kekuatan dari material, dan juga digunakan untuk membuang gas ammonia yang terbentuk. Spesimen uji dibuat dengan memvariasikan lama proses post curing. Pengujian bending, foto makro dan SEM sudah dilakukan pada pada penelitian sebelumnya untuk mengtahui efek dari post curing pada kekuatan material. Pengujian porositas dilakukan untuk menunjang kesimpulan dari penelitian sebelumnya. Hasilnya menunjukan bahwa post curing memberikan pengaruh pada pembentukan porositas didalam material komposit.
Pengaruh Media Pendingin pada Perlakuan Panas T6 terhadap Kekuatan Tarik dan Struktur Mikro Komposit Al6061-Pasir pantai Hafidh Rawi Mufti; Hammar Ilham Akbar; Eko Surojo; Wibowo Wibowo; Teguh Triyono; Sukmaji Indro Cahyono; Nurul Muhayat; Triyono Triyono
METAL: Jurnal Sistem Mekanik dan Termal Vol 5, No 2 (2021): Jurnal Sistem Mekanik dan Termal (METAL)
Publisher : Department of Mechanical Engineering, Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1011.197 KB) | DOI: 10.25077/metal.5.2.51-59.2021

Abstract

Al6061-sea sand composite was manufactured using the stir casting method and its mechanical properties were improved by heat treatment. The T6 heat treatment used to improve the mechanical properties of the composite consists of the following processes: solution heat treatment, quenching, and artificial aging. The solution heat treatment process was carried out at a temperature of 540oC for 6 hours. The quenching process was carried out with different quenching agents (water, oil, and 10% brine). The difference in quenching agents resulted in different cooling rates. After quenching, an artificial aging process was carried out at a temperature of 200 oC for 4 hours. The difference in cooling rate affects the hardness and tensile strength of the specimen. The high cooling rate results in an increase in the tensile strength of the specimen. This is due to the increase in cooling speed, the Mg2Si precipitates formed are smaller in size and located in the grains. The highest tensile strength of specimen (206.67 MPa) is obtained by using brine quenching agent.
Rancang Bangun Alat Olahraga Luar Ruang untuk Pengembangan Integrasi Wisata Alam-Olahraga Sukmaji Indro Cahyono; Triyono Triyono; Nurul Muhayat; Eko Surojo; Teguh Triyono
E-Dimas: Jurnal Pengabdian kepada Masyarakat Vol 13, No 2 (2022): E-DIMAS
Publisher : Universitas PGRI Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26877/e-dimas.v13i2.6703

Abstract

Kemajuan teknologi yang membawa kemudahan bagi manusia untuk bekerja, berbelanja, dan berwisata. Berdasarkan data dari kementrian Pariwisata telah terjadi pergeseran pilihan wisata yang diinginkan masnyarakat beberapa tahun belakangan ini seiring kesadaran untuk hidup sehat dengan berolahraga. Wisata olahraga menjadi tren tujuan wisata baru yang terintegrasi dengan wisata alam. Wisata ini berpotensi untuk dikembangkan area wisata Gunung Pegat desa Karangasem Sukoharjo. Permasalahan pada pengembangan wisata Alam-olahraga pada Gunung Pegat terkendala oleh infrastruktur di kawasan tersebut.  Inovasi pembangunan infrastruktur taman rekreasi yang dilengkapi alat olahraga outdoor (luar ruang). Program PKM ini akan difokuskan pada rancang bangun alat olahraga Outdoor yang sesuai dengan kondisi alam dan budaya olahraga masyarakat. Pelaksanaan perancangan hingga manufaktur dilaksanaan di lingkungan kampus. Prototipe yang telah dibangun ditempatkan di area wisata sebagai percontohan bagi warga dalam mengembangkan produk serupa. Pembangunan alat olahraga outdoor diharapkan dapat meningkatkan roda perekonomian warga Desa Karangasem, Bulu-Sukoharjo.
Investigation of Honeycomb Sandwich Panel Structure using Aluminum Alloy (AL6XN) Material under Blast Loading Dany Taufiq Alim Ansori; Aditya Rio Prabowo; Teguh Muttaqie; Nurul Muhayat; Fajar Budi Laksono; D. D. Dwi Pria Tjahjana; Ari Prasetyo; Yemi Kuswardi
Civil Engineering Journal Vol 8, No 5 (2022): May
Publisher : Salehan Institute of Higher Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28991/CEJ-2022-08-05-014

Abstract

In this study, we focused on the large inelastic behavior of a sandwich panel made of two solid plates as a stiffener and a honeycomb core shell subjected to blast load. The loading scheme was carried out using an explosive charge bullet mounted at a standoff distance of 100 mm with three mass variations of trinitrotoluene: 1, 2, and 3 kg TNT. The numerical simulations performed using ABAQUS/CAE were validated with the experimental results of a previous study. The geometrical effects of the sandwich panel on intact and damaged models were also numerically investigated. The panel was designed using a square and hexagonal honeycomb core. The effect of honeycomb core height was also observed by modeling the core using three height variations: 31, 51, and 71 mm. The results showed that the hexagonal core was more resistant to blast loads than the square design. The core height parameter determines the energy absorption based on these results. The structural strength is also affected by the damage. The findings of this study can be used to improve structural designs that utilize sandwich panels to withstand blast loads. Doi: 10.28991/CEJ-2022-08-05-014 Full Text: PDF
Frictional Characterization Of Grey Cast Iron Train Brake Block Using A Reduced Scale Dynamometer Bernardus Prasetya Utama; Herru Santoso Budiono; Eko Surojo; Nurul Muhayat
Mekanika: Majalah Ilmiah Mekanika Vol 21, No 1 (2022): MEKANIKA: Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v21i1.48246

Abstract

The brake block is an important component that serves to slow down and stop the train. The safety of this transportation is very dependent on the reliability of this component. One of the important features of the brake block material is the coefficient of friction. The coefficient of friction of the brake block material must meet and match the requirements. The coefficient of friction of a material is measured using a friction test. Previous studies have shown that the friction coefficient of a material is influenced by braking conditions, namely contact pressure and friction speed. Many friction testing methods have been developed to study the characteristics of friction materials.  In contrast to previous studies, in this study, the frictional characteristics of gray cast iron brake blocks were evaluated using a reduced scale dynamometer. The friction test is carried out by pressing the brake block specimen to the surface of the rotating wheel. The specimen size of the brake block and carriage wheels is reduced to 1/4 of the original size. The friction test is carried out at a contact pressure of 0.15,  0.20, 0.25, and 0.30 (MPa) and the friction speeds of 3, 6, 9, and 12 (m/s). The results of this study indicate that the coefficient of friction of the gray cast iron brake block decreases with increasing friction speed and contact pressure.
Co-Authors Aditya Rio Prabowo Alvia Restu Putra Utama Aprianur Fajri Ari Prasetyo Ari Prasetyo Bernardus Prasetya Utama Budy Nugroho D. D. Dwi Pria Tjahjana Dany Taufiq Alim Ansori Dody Ariawan Eko Surojo Eko Surojo Eko Surojo Eko Surojo Fajar Budi Laksono Fajar Budi Laksono Hafidh Rawi Mufti Hammar Ilham Akbar Herru Santosa Budiono Herru Santoso Budiono Ilham Habibi Imam Abdul Majid Januar Tri Prasetyo Joko Triyono Joung Hyung Cho Kuswardi, Yemi Lenggana, Bhre Masa'id, Aji Mazlan, Saiful Mustakim Mustakim Rama Panji Kusuma Ridwan Ridwan Rizal Akhmad Bukhori Sigit Edy Purwanto Sukmaji Indro cahyono Syamsul Hadi T Triyono Taufik, Ikhwan Teguh Muttaqie Teguh Triyono Titis Srimuda Pitana Triyono . Triyono Triyono Triyono Triyono Ubaidillah, Ubaidillah Wibowo Wibowo Wibowo, Wibowo