Analisis Kelelahan Automatic Coupler pada Kereta Ringan terhadap Pembebanan Bervariasi Menggunakan Metode Elemen Hingga

Wandari, Aprilia Ayu (2021) Analisis Kelelahan Automatic Coupler pada Kereta Ringan terhadap Pembebanan Bervariasi Menggunakan Metode Elemen Hingga. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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	Text 02111740000012-Undergraduate_Thesis.pdf Restricted to Repository staff only until 1 October 2023. Download (3MB) | Request a copy

Abstract

Kereta api dapat beroperasi dengan sempurna apabila semua komponennya berada dalam keadaan baik. Salah satu komponen kereta api yang krusial adalah coupler. Coupler
digunakan untuk menyambungkan dua gerbong kereta ataupun
antara lokomotif dan rangkaian gerbong kereta agar berjalan satu rangkaian panjang tanpa adanya hambatan. Dalam penggunaannya, coupler dapat mengalami fatigue yang dapat mempengaruhi kekuatan struktur dari coupler itu sendiri. Coupler bisa retak dan patah jika menerima beban terus-menerus dalam jangka waktu tertentu. Hal tersebut dapat mengganggu operasional kereta dan bisa menyebabkan kecelakaan. Pada penelitian ini dilakukan analisis kelelahan pada automatic coupler hasil rancangan (Izzan, 2020) untuk mengestimasi ketahanan umur dan kerja automatic coupler terhadap pembebanan yang terjadi.
Pada penelitian ini mengacu pada standard automatic
coupler yang ada. Pembebanan kereta ringan mengacu pada
standar ASME RT-1-2010 dan standard EN16019:2014. Pada
penelitian ini variasi pembebanan didapatkan dari perubahan percepatan, perlambatan, dan kecepatan dalam operasi kereta LRT. Serta kondisi track lurus, menanjak, dan menikung. Simulasi dilakukan dengan metode elemen hingga. Model yang digunakan analisis adalah mechanical head dari automatic coupler hasil rancangan penelitian sebelumnya.
Hasil simulasi fatigue safety factor yang didapat dari
simulasi dikategorikan aman, karena bernilai di atas nilai 1 pada semua kondisi pada material ASTM A36. Kecuali, untuk kondisi II pada material S 45 C fatigue safety factor yang didapat bernilai dibawah nilai 1. Nilai tertinggi fatigue safety factor sebesar 2,09
pada kasus I dan nilai terendah fatigue safety factor sebesar 0,94 pada kasus II. Pada kasus III, fatigue safety factor bernilai 1,18. Pada kasus IV, fatigue safety factor bernilai 2,03 dan pada kasus V, fatigue safety factor bernilai 1,98. Fatigue life setiap kondisi
yang didapat dari hasil simulasi bernilai infinite life karena umur kelelahannya lebih dari 106 cycle. Umur total dari automatic coupler yang dihitung berdasarkan asumsi satu siklus pengulangan berangkat dari Stasiun Sultan Mahmud Badaruddin II menuju Stasiun DJKA adalah sebesar 4,03 x 107 cycle. Dimana desain automatic coupler tersebut dikategorikan infinite life.
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A train can operate perfectly if all its components are in good condition. One of the crucial components of the train is the coupler. Couplers are used to connect two train cars or between a locomotive and a series of train cars to run a long series without any obstacles. In use, the coupler can experience fatigue which can affect the structural strength of the coupler itself. The coupler can crack and break if it receives a continuous load for a certain period. This can disrupt train operations and can cause accidents. In this study, a fatigue analysis was carried out on the designed automatic coupler (Izzan, 2020) to estimate the age and working resistance of the automatic coupler against the loading that occurred.
This study refers to the existing standard automatic coupler. The light rail loading refers to the ASME RT-1-2010 standard and the EN16019:2014 standard. In this study, variations in loading were obtained from changes in acceleration, deceleration, and speed in the operation of the LRT train. As well as track conditions straight, uphill, and cornering. Simulations were carried out using the finite element method. The model used in the analysis is the mechanical head automatic coupler from the previous research design.
The simulation results of the fatigue safety factor obtained from the simulation are categorized as safe because the value is above 1 in all conditions on the ASTM A36 material. Unless for condition II on material S 45 C the fatigue safety factor was obtained based on the value 1. The highest fatigue safety factor value was 2.09 in case I, and the lowest was 0.94 in case II. In case III, the fatigue safety factor is 1.18. In case IV, the fatigue safety factor is 2.03 and in the case of V, the fatigue safety factor is 1.98. Fatigue life of each condition obtained from the results of the assessment of life is infinite because the fatigue life is more than 106 cycles. The automatic coupler's total age, which is calculated based on one cycle of numbers departing from Sultan Mahmud Badaruddin II Station to DJKA Station, is 4,03 x 107 cycles. Where the automatic coupler design is categorized as infinite life.

Item Type:	Thesis (Undergraduate)
Uncontrolled Keywords:	Automatic coupler, fatigue life, fatigue safety factor
Subjects:	T Technology > TF Railroad engineering and operation > TF270 Railway structures and buildings T Technology > TJ Mechanical engineering and machinery > TJ230 Machine design T Technology > TJ Mechanical engineering and machinery > TJ669.B7 Locomotive brakes
Divisions:	Faculty of Industrial Technology and Systems Engineering (INDSYS) > Mechanical Engineering > 21201-(S1) Undergraduate Thesis
Depositing User:	Aprilia Ayu Wandari
Date Deposited:	25 Aug 2021 07:34
Last Modified:	25 Aug 2021 07:34
URI:	http://repository.its.ac.id/id/eprint/89545

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