Zayadi, Ahmad
Program Studi Teknik Mesin, Fakultas Teknik dan Sains Universitas Nasional, Jakarta

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Perencanaan Lift Hotel Bertingkat Tiga Puluh Berdasarkan SNI Nomor: 03-6573-2001 Masyhudi, Masyhudi; Zayadi, Ahmad; Prasetyo, Cahyono Heri
Jurnal Ilmiah Giga Vol 18, No 2 (2015): Volume 18, Edisi 2, Desember 2015
Publisher : Universitas Nasional

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Abstract

ABSTRAK. Banyaknya gedung-gedung tinggi yang dibangun seperti zaman sekarang ini, menyebabkan tranportasi vertikal di antara lantai gedung-gedung tersebut semakin di butuhkan. Elevator atau lift merupakan salah satu dari alat transportasi vertikal yang banyak di gunakan saat ini, hal ini di sebabkan perjalanan antar lantai dengan menggunakan elevator di dalam gedung tersebut lebih menghemat waktu dan tenaga di bandingkan dengan menggunakan tangga. Lift ini juga di bedakan jenisnya berdasarkan pemakaian, antara lain, lift untuk penumpang, lift untuk barang, lift untuk kendaraan, lift untuk pasien, dan juga lift dump waiters. Perencanaan bangunan ini adalah bangunan hotel berlantai tiga puluh dengan luasan perlantai 1200 m². Pemasangan lift ini dibagi menjadi dua zona, zona 1 yaitu dari lantai 1sampai dengan lantai 15, dan zone 2 yaitu dari lantai 16 sampai dengan lantai 30. Mempunyai waktu perjalanan bolak-balik untuk zona satu selama 159,2 detik, dan zona dua selama 167,04 detik. Membutuhkan 10 buah lift, mempunyai waktu menunggu untuk zona 1 selama 31,8 detik, dan untuk zona dua selama 33,4 detik. Mempunyai daya angkut untuk zona satu sebanyak 188 orang dan zona dua sebanyak 180 orang, beban puncak zona satu sebanyak 138 orang dan 158 orang, daya listrik untuk zona satu sebesar 204 Kwh dan zona dua sebesar 340 Kwh.Kata Kunci : Perencanaan, Elevator, SNI
ANALISIS KEGAGALAN PISTON PADA KENDARAAN RODA EMPAT KAPASITAS 1000 CC Zayadi, Ahmad
Bina Teknika Vol 14, No 2 (2018): Bina Teknika
Publisher : Fakultas Teknik UPN "Veteran" Jakarta

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Abstract

Pistons are one of the main components of a 1000 cc engine that functions as a pressure suppressor and a recipient of pressure combustion in the combustion chamber. In the examination of the 1000 cc sedan engine that has been operating for 30,000 hours found a rough sound on the engine and experienced loss compression on the cylinder block number 2. The purpose of the study was to obtain the factors causing the deformation of the piston 1000 cc sedan vehicles. The research method used is metallographic observation using ASTM E 3 and ASTM E 112, testing hardness using ASTM E 92 and SNI 19-0409-1989 and testing chemical composition using ASTM A 751. The results of research on piston damage can be seen that observation macrostructure proves that there is plastic deformation on the surface area of the piston material, the results of microstructure observation are known to occur microcrack on the top surface of the right side of the piston, there is no change in micro hardness between the piston material in the deformed area with the deformed piston material hardness, piston material made of alloy Al-Si. In the area of the piston surface that experiences deformation, Mg2Si and Mg2Al3 compounds are formed, these compounds which cause microcrack on the piston's upper surface. Plastic deformation on the piston surface occurs due to a collision between the piston surface and the cylinder head due to the buildup of crust on the piston surface.
Perancangan Alat Pengangkat Sistem Hidrolik Tipe H Pada Tempat Pencucian Mobil Dengan Kapasitas Maximum 2.5 Ton Meladiyani, Ervini; Permana, Bayu; Marsudi, Marsudi; Zayadi, Ahmad
Jurnal Ilmiah Giga Vol 21, No 1 (2018): Volume 21 Edisi 1 Tahun 2018
Publisher : Universitas Nasional

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Abstract

Hydrolic system is tecknology wich uses fluid, work fluid that is used is oil with viscosity number of 10 SAE. This system work based on the principle of Pascal Low, that is if fluid given pressure, so that pressure will go to all direction by not added or less its pressure. By calculating of type H design hoist car system where as can be result teol that the permession strength of force material is bigger than the happenned strength of force material b = 9.25 kg/mm2  b =0.34 kg/mm2 and g= 70,98 kg/mm2  g= 10,46 kg/mm2. So that the construction of type H design hoist car system by using of material BJ 37 is said saved and strong to be used. On this type H design hoist car system based on SNI 05-3659-1995 which is about hydrolic fluid power with the rod end spherical eyes could be operated perfectly to hoist the car of 2.5 tonnes load. By desig specification of pump hydrolic capasity which is used 0.2 dm3/minutes, power of pump as big 5.4 KW and maximum of load capasity of 2.5 tonnes.
ANALISIS KEKUATAN STRUKTUR SISTEM MEKANIK PESAWAT SINAR-X DIGITAL Zayadi, Ahmad; sudi, Mar
JTK: JURNAL TEKNOLOGI KEDIRGANTARAAN Vol 4, No 2 (2019): JURNAL TEKNOLOGI KEDIRGANTARAAN
Publisher : JTK: JURNAL TEKNOLOGI KEDIRGANTARAAN

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Abstract

Analysis of structural strength of mechanical systems on digital x-ray devices. This research is very important to know the strength and quality of the structure of mechanical system of digital x-ray plane. To research analysis strength structure system mechanical calculation methods were used counting stress, bending stress; the safety factor a tool, and calculate deflection occurring in structure.The result of his research or: the bending stress at order holders catcher of  = 7,07 N/mm2, while the bending stress is equal to = 141,9 N/mm2. The bending stress on the tube holder is as big as  = 7,8 N/mm2, while the bending stress is equal to= 141,9 N/mm2. Stress von mises in order arms part burden a counterweight of  = 19,44 N/mm2, while the value of the safety factor is n = 11,05. Stress von mises in order to arms a part of encumbering tube  = 18,41 N/mm2, while the value of the safety factor is n = 11,67. Bending stress happened to column of order  = 22,60 N/mm2, while the bending stress is equal to  = 141,9 N/mm2. The ball screw move of the operation Fbm = 777,9N. Bending stress occurred on the basis of order  = 21,43 N/mm2, while the bending stress is equal to  = 141,9 N/mm2. Based on the data has obtained, then structure mechanical system plane digital sinar-x expressed safe and strength.Analysis of structural strength of mechanical systems on digital x-ray devices. This research is very important to know the strength and quality of the structure of mechanical system of digital x-ray plane. To research analysis strength structure system mechanical calculation methods were used counting stress, bending stress; the safety factor a tool, and calculate deflection occurring in structure.The result of his research or: the bending stress at order holders catcher of  = 7,07 N/mm2, while the bending stress is equal to = 141,9 N/mm2. The bending stress on the tube holder is as big as  = 7,8 N/mm2, while the bending stress is equal to= 141,9 N/mm2. Stress von mises in order arms part burden a counterweight of  = 19,44 N/mm2, while the value of the safety factor is n = 11,05. Stress von mises in order to arms a part of encumbering tube  = 18,41 N/mm2, while the value of the safety factor is n = 11,67. Bending stress happened to column of order  = 22,60 N/mm2, while the bending stress is equal to  = 141,9 N/mm2. The ball screw move of the operation Fbm = 777,9N. Bending stress occurred on the basis of order  = 21,43 N/mm2, while the bending stress is equal to  = 141,9 N/mm2. Based on the data has obtained, then structure mechanical system plane digital sinar-x expressed safe and strength.