Perencanaan dan Analisa Driveshaft Mobil Formula Nogogeni ITS Menggunakan Software Berbasis Metode Elemen Hingga

Simadani, Ayudya Putri Taruna (2022) Perencanaan dan Analisa Driveshaft Mobil Formula Nogogeni ITS Menggunakan Software Berbasis Metode Elemen Hingga. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Tim Nogogeni ITS kali pertama mengikuti kompetisi Formula Student SAE 2020 secara online. Untuk memenangkan kompetisi ini, Tim Nogogeni ITS diharuskan merancang mobil formula dengan kecepatan tinggi. Salah satu faktor yang dapat mempengaruhi kecepatan ialah massa kendaraan. Semakin ringan massa kendaraan, maka kendaraan dapat melaju semakin cepat. Agar dapat mengurangi massa kendaraan, dapat dilakukan pengurangan massa pada poros mobil. Pada laporan tugas akhir ini akan membahas tentang perhitungan mengenai distribusi gaya-gaya yang bekerja pada poros. Terdapat empat poros yang akan dianalisa yaitu poros pejal dan berlubang dengan material AISI 1045, kemudian poros pejal dan berlubang dengan material Al 7075 T6. Dalam perhitungan, faktor keamanan ditentukan terlebih dahulu, yaitu sebesar 2,6. Sehingga dapat menentukan tegangan von-misses dan diameter minimum poros yang optimal dan masih aman untuk digunakan. Setelah mendapatkan diameter minimum dan massa poros, dilakukan simulasi menggunakan Metode Elemen Hingga untuk mempermudah melakukan analisa kekuatan struktur. Berdasarkan hasil dari penelitian ini, pada poros pejal AISI 1045 didapatkan tegangan von-misses sebesar 177,51 MPa dan diameter minimum sebesar 22 mm menurut perhitungan, lalu didapatkan tegangan von-misses sebesar 178,3 MPa dan faktor keamanan sebesar 2,88 menurut hasil simulasi dengan massa poros sebesar 1,03 kg. Pada poros pejal Al 7075 T6 didapatkan tegangan von-misses sebesar 177,51 MPa dan diameter minimum sebesar 22 mm menurut perhitungan, lalu didapatkan tegangan von-misses sebesar 178,32 MPa dan faktor keamanan sebesar 2,82 menurut hasil simulasi dengan massa poros sebesar 0,37 kg sehingga pengurangan massa sebesar 64 % dari massa awal. Pada poros berlubang AISI 1045 didapatkan tegangan von-misses sebesar 192,78 MPa, diameter dalam sebesar 22 mm, dan diameter luar sebesar 25 mm menurut perhitungan, lalu didapatkan tegangan von-misses sebesar 187,23 MPa dan faktor keamanan sebesar 2,75 menurut hasil simulasi dengan massa poros sebesar 0,44 kg sehingga pengurangan massa sebesar 57 % dari massa awal. Pada poros berlubang Al 7075 T6 didapatkan tegangan von-misses sebesar 192,78 MPa, diameter dalam sebesar 22 mm, dan diameter luar sebesar 25 mm menurut perhitungan, lalu didapatkan tegangan von-misses sebesar 187,23 MPa dan faktor keamanan sebesar 2,68 menurut hasil simulasi dengan massa poros sebesar 0,16 kg sehingga pengurangan massa sebesar 84 % dari massa awal. Untuk validasi dilakukan perbandingan antara hasil perhitungan teoritis dan hasil simulasi untuk mendapatkan selisih nilainya. Dari keempat poros, dipilih poros berlubang dengan material Al 7075 T6 karena memiliki pengurangan massa yang paling besar yaitu 84 % dari massa desain awal dan memiliki faktor keamanan ≥ 2,6 yaitu 2,68 yang membuktikan bahwa poros aman untuk digunakan. =================================================================================================== Nogogeni ITS Team, for the first time participated at Formula Student SAE 2020 online competition. To win this competition, Nogogeni ITS Team was required to design a formula car with high speed. One of the factors that can affect speed is the mass of the vehicle. If the mass of the vehicle is lighter, the vehicle speed will be increased. In order to reduce the vehicle mass, it can be done to reduce the driveshaft mass of the vehicle. In this final report will discuss about the calculation of the distribution of forces acting on driveshafts. There are four driveshafts to be analyzed. They are solid and hollow shafts with AISI 1045 material, then solid and hollow driveshafts with Al 7075 T6 material. In the calculation, the safety factor is determined before, which is 2.6. So that it can determine the von-misses stress and minimum diameter of the driveshaft which is optimal and still safe to use. The simulation is carried out using the Finite Element Method to facilitate the analysis of structural strength after getting the minimum diameter and mass of the driveshaft. Based on the results of this study, the AISI 1045 solid shaft obtained a von-misses stress of 177,51 MPa and a minimum diameter of 22 mm according to calculations, then obtained a von-misses stress of 178,3 MPa and a safety factor of 2,88 according to the simulation results with the mass of the shaft is 1,03 kg. On the solid shaft Al 7075 T6, the von-misses stress is 177,51 MPa and the minimum diameter is 22 mm according to calculations, then the von-misses stress is 178,32 MPa and the safety factor is 2,82 according to the simulation results with a shaft mass of 0,37 kg. resulting in a reduction in mass of 64 % of the initial mass. The AISI 1045 hollow shaft, the von-misses stress is 192,78 MPa, the inner diameter is 22 mm, and the outer diameter is 25 mm according to calculations, then the von-misses stress is 187,23 MPa and the safety factor is 2,75 according to the simulation results. with a shaft mass of 0,44 kg so that the mass reduction is 57 % of the initial mass. On the hollow shaft AL 7075 T6, the von-misses stress is 192,78 MPa, the inner diameter is 22 mm, and the outer diameter is 25 mm according to calculations, then the von-misses stress is 187,23 MPa and the safety factor is 2.68 according to the results. simulation with a shaft mass of 0.16 kg so that the mass reduction is 84 % of the initial mass. For validation, a comparison is made between the results of theoretical calculations and simulation results to get the difference in value. Of the four shafts, the hollow shaft is selected with Al 7075 T6 material because it has the largest mass reduction, which is 84 % of the initial design mass and has a safety factor of 2.6, which is 2.68 which proves that the shaft is safe to use.

Item Type: Thesis (Undergraduate)
Uncontrolled Keywords: Faktor Keamanan, Metode Elemen Hingga, Poros, Tegangan Geser Maksimum, Driveshaft, Finish Element Method, Maximum Shear Stress, Safety Factor.
Subjects: T Technology > TA Engineering (General). Civil engineering (General) > TA347 Finite Element Method
T Technology > TA Engineering (General). Civil engineering (General) > TA645 Structural analysis (Engineering)
T Technology > TA Engineering (General). Civil engineering (General) > TA658 Structural design
T Technology > TJ Mechanical engineering and machinery
T Technology > TJ Mechanical engineering and machinery > TJ230 Machine design
Divisions: Faculty of Vocational > Mechanical Industrial Engineering
Depositing User: Ayudya Putri Taruna Simadani
Date Deposited: 22 Mar 2022 07:59
Last Modified: 22 Mar 2022 07:59
URI: https://repository.its.ac.id/id/eprint/93213

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