Pemodelan Prototype Series Active Variable Geometry Suspension

Amarta, Dicko Ilham (2021) Pemodelan Prototype Series Active Variable Geometry Suspension. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Suspensi aktif adalah suatu inovasi pada teknologi otomotif. Pada saat ini, terdapat berbagai jenis suspensi aktif, salah satu nya adalah Series Active Variable Geometry Suspension (SAVGS). Pada suspensi aktif SAVGS, posisi linkage diatur sesuai dengan kondisi jalan. Respon tertentu akan dihasilkan berdasarkan pengaturan posisi linkage tersebut, dan akan dihasilkan peforma tertentu. Sedangkan peforma suspensi dinilai berdasarkan percepatan sasis, defleksi suspensi, dan defleksi ban. Kenyamanan sebuah kendaraan dapat diukur berdsarkan percepatan sasis, sedangkan keamanan didefinisikan berdasarkan defleksi ban. Kondisi aman terjadi ketika kendaraan tersebut dapat dikendalikan. Suatu kendaraan dapat dikendalikan apabila roda berada di permukaan jalan, sehingga grip yang baik akan diperoleh ban. Pada kondisi normal, ketika defleksi ban yang terjadi sangat besar, maka roda tidak berada di permukaan tanah. Akibatnya, kendaraan akan sulit untuk dikendalikan, sehingga keamanan pengemudi dan penumpang berkurang. Kemudian, gaya yang bekerja pada suspensi ditandai dengan defleksi suspensi. Kondisi tersebut berhubungan dengan spesifikasi shockabsorber yang akan digunakan pada suspensi.
Pada penelitian ini, sebuah model ¼ kendaraan dengan sistem suspensi double wishbone ber skala 1:10 digunakan sebagai objek penelitian. Model tersebut dilengkapi 2 aktuator, aktuator 1 dipasang pada shockabsorber dan aktuator lain dipasang pada cham yang disebut sebagai road disturbation. Model dilengkapi dengan shockabsorber RC Car, dan load support yang diletakan pada sasis. Kemudian, sasis dihubungkan pada sepasang railway sehingga model tersebut dapat bergerak naik turun. Kesetimbangan model akan diganggu oleh gerakan road disturbation. Suspensi aktif SAVGS dimodelkan dengan menghubungkan kontroller ke aktuator 1, dimana kontroller di-design dengan LQR. Sedangkan suspensi pasif dimodelkan tanpa kontroller, sehingga aktuator 1 tidak bergerak. Setiap model suspensi pasif dan aktif tersebut di-simulasikan selama 7 detik di Simscape Multibody. Setelah itu, dilakukan variasi pada dimensi linkage suspensi aktif SAVGS hingga dihasilkan 3 konfigurasi suspensi aktif SAVGS. Kemudian, masing-masing konfigurasi di-simulasikan dengan Simscape Multibody. Dengan waktu simulasi yang sama, peforma setiap konfigurasi kemudian dibandingkan sehingga pengaruh variasi dimensi linkage terhadap peforma suspensi aktif SAVGS dapat dipahami.
Berdasarkan hasil penelitian, diketahui bahwa percepatan sasis yang dihasilkan suspensi aktif SAVGS lebih rendah hingga 7.6% dibandingkan suspensi pasif, sedangkan defleksi suspensi yang dihasilkan lebih tinggi hingga 1.175% dibandingkan suspensi pasif. Kemudian, berdasarkan variasi terhadap dimensi linkage, diketahui bahwa percepatan sasis yang dihasilkan suspensi aktif dengan lower arm lebih panjang lebih rendah 4.6%, sedangkan percepatan sasis yang dihasilkan suspensi aktif SAVGS dengan upper arm lebih panjang lebih tinggi 10.52%. Kondisi tersebut juga berpengaruh terhadap defleksi suspensi dan ban. Dengan demikian, dapat diketahui bahwa variasi terhadap dimensi linkage berpengaruh terhadap respon yang dihasilkan suspensi aktif SAVGS.
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Active Suspension is an inovation in otomotive industry. There are any type of Active Suspension, one of them called Series Active Variable Geometry Suspension (SAVGS). This Active Suspension has an ability to set the position of suspension’s linkage, resulting different geometry of suspension. The reason is certain response, which is certain peformance. Suspension’s peformance evaluated form chassis’s acceleration, suspension deflection, and tire deflection. The vehicle’comfort evaluated from chassis acceleration, and vehicle’s safety evaluated form tire deflection. Vehicle’s safety defined controlability. To make sure that vehicle was controlable, the tire must locate on the road, where bigger tire deflection shall not happend. When tire deflection come bigger than their own ability, it can not maintain their position on road, then the passsenger will be faced by fatal risk. Suspension’s peformance evaluated from suspension’s deflection too, wich allow designer to choose shocakbsorber properly.
This research used 1:10 scaled Quarter Car double wishbone suspension’s model. It had 2 actuators, 1 actuator mounted on shockabsorber, the other installed on a cam called road disturbation. It was equipped with RC Car’s shockabsorber, and a load support. It was connected to railway, so that it could move up and down. The equilibrium’s position would be disturbed by road disturbation. Active Suspension defined from the actuator that was connected to shockabsorber’s by a link called single link. According to assembly, the suspension could be set on any geometry by actuator’s rotation, while actuator’s rotation controlled by controller designed with LQR. It could be passive one too,basically the current assembly without controller. The peformance of this model was known by doing simulation on Simscape Multibody, first simulation was to compared the peformance between Passive and Active model at constant and variaty speed, where the other one was in active model only, while linkage dimensions would be varied.
From simulation, chassis acceleration of Active model was 7.6% lower than the passive one, while the suspension deflection was 1.175% higher. Then, from variation of road disturbation’s angular velocity known that overall peformance of active suspension’s model was decrease as long as the speed increase, but the peformance is still better than passive model. From variation of the suspension’s linkage, chassis acceleration of Active Suspension compared to unmodified model SAVGS with longer upper arm was higher 10.52% while the other one with longer lower arm was decreased by 4.6%. From this condition, known that suspension’s peformance affected by linkage’s dimension.

Item Type:	Thesis (Other)
Additional Information:	RSM 629.243 Ama p-1 2021
Uncontrolled Keywords:	Suspensi akti, savgs, dimensi linkage, percepatan sasis, defleksi suspensi
Subjects:	T Technology > TL Motor vehicles. Aeronautics. Astronautics > TL257 Springs and suspension
Divisions:	Faculty of Industrial Technology and Systems Engineering (INDSYS) > Mechanical Engineering > 21201-(S1) Undergraduate Thesis
Depositing User:	- Davi Wah
Date Deposited:	20 Jun 2023 04:16
Last Modified:	20 Jun 2023 04:16
URI:	http://repository.its.ac.id/id/eprint/98137

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