Analisis Kebutuhan Limited Slip Differential (LSD) pada Mobil Formula Sapuangin Speed 6 di Ajang Student Formula Japan (SFJ)

Rahman, Khalikul Haqqur (2019) Analisis Kebutuhan Limited Slip Differential (LSD) pada Mobil Formula Sapuangin Speed 6 di Ajang Student Formula Japan (SFJ). Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Perkembangan teknologi pada mobil semakin banyak. Salah satunya Limited Slip Differential (LSD), yang diaplikasikan pada sistem powetrain dari mobil. Tahun 2018 merupakan tahun ke enam ITS Team Sapuangin dengan mobil Sapuangin Speed (SAS) 6 mengikuti event SFJ. Namun, peringkat ITS Team Sapuangin pada ajang Student Formula masih cenderung kurang baik. Pada 2018 ITS team Sapuangin hanya menduduki peringkat 58 pada skidpad, peringkat 61 pada autocross dan peringkat 60 pada endurance. Hal ini terjadi karena torsi dan daya dari engine tidak dapat disalurkan dengan baik pada roda. Ketika mobil berbelok dan salah satu roda kehilangan gaya normalnya maka mobil akan mengalami guling, kemudian roda yang menempel dijalan akan kehilangan traksinya.
Dalam penelitian ini, penulis akan melakukan analisa perhitungan berdasarkan FBD mobil pada saat berbelok pada lintasan student formula. Menghitung kecepatan yang diijinkan, kemudian menghitung kecepatan yang harus ditempuh, selanjutnya analisa skid dan guling, dan yang terakhir menghitung Road-Load Horse Power (Rhp), Torsi roda saat berbelok yang dapat disalurkan oleh LSD pada salah satu roda. Perhitungan pada analisa ini diberikan variasi clutch plate (0011/60%, 0101/100%) dan variasi ramp angle (90o/0%, 60o/29%, 50o/42%, 45o/51%, 40o/60%, 30o/80%) yang dilakukan pada skidpad (R=8,55m), hairpin turns pada autocross dan endurance (Rmin=4,5m) serta pada constant turns pada autocross dan endurance (R=11m-27m).
Dari analisa radius kritis (hairpin turns) yang dipengaruhi LSD didapatkan hasil penggunaan LSD akan optimum pada locking pecentage LSD terbesar, ketika mobil SAS 6 melaju dengan kecepatan 18,37 m/s, akan menyebabkan roda mobil terangkat maksimal pada hairpin turns radius 4,5 m dengan sudut angkat 17,999o. Dan ketika tidak menggunakan LSD (LP=0%) maka tenaga mobil (Rhp) adalah 0 watt dan menghasilkan kecepatan untuk melaju 0 m/s, serta torsi pada roda bagian luar 3,884 Nm. Ketika menggunakan LSD dengan loocking percentage (LP) 88%, mobil akan memiliki tenaga (Rhp) sebesar 2477,352 watt yang akan menyebabkan mobil memiliki kecepatan 17,480 m/s dan torsi roda sebesar 17,999 Nm. Dan untuk pemilihan LSD harus memiliki initial torque sama dengan nilai torsi roda pada saat roda mulai terangkat.
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Technological developments in cars are increasing. One of them is Limited Slip Differential (LSD), which is applied to the power train system of the car. 2018, is the sixth year of ITS Team Sapuangin with Sapuangin Speed (SAS) 6 participating in the SFJ event. However, the ITS Team Sapuangin ranking in the SFJ event still tends to be poor. In 2018, the Sapuangin ITS team was only ranked 58th in the skidpad, ranked 61th on autocross and ranked 60th on endurance. This happens because the torque and power from the engine cannot be distributed properly to the wheels. When the car turns and one of the wheels loses its normal force, the car will rolling, then the wheels that stick on the road will lose its traction.
In this thesis, will analyze the calculation based on the car's FBD when turning on the student formula sircuit. Calculate the allowable speed, calculate the speed that must be taken, then analyze skid and rolling, and the last is calculates Road-Load Horse Power (Rhp), wheel torque when turning that can be distributed by LSD on one wheel. The calculation in this analysis is given a variation of clutch plate (0011/60%, 0101/100%) and ramp angle variations (90o/0%, 60o/29%, 50o/42%, 45o/51%, 40o/60%, 30o/80%) done on skidpad (R = 8,55m), hairpin turns on autocross and endurance (Rmin = 4,5m) and on constant turns autocross and endurance (R = 11m-27m).
From the analysis of the critical radius (hairpin turns) affected by LSD the results of LSD use will be optimum in the largest locking pecentage LSD, when SAS 6 drives at a speed of 18,37 m/s, will cause the car wheel to be lifted maximum on the hairpin turns radius 4,5 m with a lift angle of 17,999o. And when not using LSD (LP = 0%), the car power (Rhp) is 0 watt and produces a speed for driving 0 m/s, as well as torque on the outer wheel of 3,884 Nm. When using LSD with a loocking percentage (LP) of 88%, the car will have power (Rhp) of 2477,352 watts which will cause the car to have a speed of 17,480 m/s and wheel torque of 17,999 Nm. And for LSD selection the initial torque must be the same as the wheel torque value when the wheel starts to lift.

Item Type:	Thesis (Undergraduate)
Additional Information:	RSM 629.248 Rah a-1 2019
Uncontrolled Keywords:	Sapuangin Speed 6, roll/guling, skid, Power LSD, V LSD, Torsi LSD, ramp angle LSD, clutch plate LSD, Limitted Slip Differential (LSD)
Subjects:	T Technology > TJ Mechanical engineering and machinery T Technology > TJ Mechanical engineering and machinery > TJ230 Machine design T Technology > TL Motor vehicles. Aeronautics. Astronautics > TL270 Automobiles--Wheels--Alignment.
Divisions:	Faculty of Industrial Technology and Systems Engineering (INDSYS) > Mechanical Engineering > 21201-(S1) Undergraduate Thesis
Depositing User:	Khalikul Haqqur Rahman
Date Deposited:	12 Nov 2021 09:30
Last Modified:	12 Nov 2021 09:30
URI:	http://repository.its.ac.id/id/eprint/61359

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