PEMODELAN DAN ANALISIS PENGARUH PERUBAHAN PARAMETER SISTEM SUSPENSI OLEO-PNEUMATIC TERHADAP GAYA REDAM DAN GAYA PEGAS SERTA RESPON DINAMIS PENUMPANG PESAWAT BOEING 747-400 SAAT PROSES LANDING DAN TAKEOFF

HESTININGRUM, YUNITA (2016) PEMODELAN DAN ANALISIS PENGARUH PERUBAHAN PARAMETER SISTEM SUSPENSI OLEO-PNEUMATIC TERHADAP GAYA REDAM DAN GAYA PEGAS SERTA RESPON DINAMIS PENUMPANG PESAWAT BOEING 747-400 SAAT PROSES LANDING DAN TAKEOFF. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Sistem suspensi oleo-pneumatic adalah sistem suspensi pasif yang biasa digunakan di pesawat terbang yang berfungsi untuk meredam vibrasi pada bodi pesawat akibat energi impact saat proses landing dan energi eksitasi yang disebabkan saat pesawat terbang berjalan melalui permukaan landasan pacu yang tidak rata dengan kecepatan yang sangat tinggi saat proses takeoff. Pada sistem suspensi oleo-pneumatic ini terdapat dua fluida kerja pada silinder hidrolisnya yaitu gas dan minyak. Parameter-parameter pada sistem suspensi seperti dimensi shock absorber, tekanan dan volume fluida akan mempengaruhi karakteristik redaman dari sebuah oleo-pneumatic shock absorber yang digunakan. Dalam tugas akhir ini dilakukan pemodelan dan analisis pengaruh perubahan parameter sistem suspensi oleo-pneumatic terhadap gaya redam dan gaya pegas serta respon dinamis penumpang pesawat Boeing 747-400 saat proses landing dan takeoff. Tekanan awal gas ( pada sistem suspensi oleopneumatic divariasikan sebesar 1,2 - 2 MPa pada volume awal gas konstan yaitu sebesar 2,752 x 10-3 m3. Volume awal gas divariasikan sebesar 2,252 x 10-3 – 3,252 x 10-3 m3 pada tekanan awal gas konstan yaitu sebesar 1,6 MPa. Serta luas penampang orifice divariasikan sebesar 6,412 x 10-4 m2 - 6,812 x 10-4 m2 dengan tekanan awal gas dan volume awal gas konstan yaitu sebesar 1,6 MPa dan 2,752 x 10-3 m3. Terdapat tiga jenis gas yang digunakan pada simulasi sistem suspensi oleopneumatic yaitu nitrogen, karbondioksida, dan udara kering. Input yang digunakan pada tugas akhir ini adalah input sinusoidal dan bump modified. Dari sistem suspensi oleo-pneumatic didapatkan bahwa semakin kecil luas penampang orifice , maka gaya redam yang dihasilkan akan semakin besar. Semakin besar tekanan awal gas ( yang digunakan pada sistem suspensi oleo-pneumatic, maka gaya pegas yang dihasilkan semakin besar. Dan semakin besar volume awal gas yang digunakan, maka gaya pegas yang dihasilkan semakin besar. Pada sistem pesawat terbang dengan penambahan sistem suspensi oleo-pneumatic untuk input bump modified (kondisi landing), seluruh respon merupakan respon transient dan mencapai kondisi steady state kurang dari 25 detik. Sedangkan untuk input sinusoidal (kondisi takeoff) dengan kecepatan pesawat terbang saat takeoff yaitu sebesar 196 knots = 362,992 km/jam, respon dinamis berupa perpindahan, kecepatan dan percepatan dari penumpang mencapai kondisi steady state sebelum 15 detik. Dari ketiga jenis gas yang digunakan pada simulasi, hasil dari nilai RMS untuk percepatan getaran penumpang adalah tidak ada keluhan (nyaman) apabila dibandingkan dengan standar ISO 2631. "=============================================================================================" The oleo-pneumatic suspension system is a type of passive suspension system commonly used in airplane which serves to dampen vibrations in the fuselage due to the impact energy during the process of landing and excitation energy that is caused when the plane goes through the uneven runway surface with a very high speed during the process of takeoff. In the oleopneumatic suspension system, there are two working fluid in the hydraulic cylinder that is gas and oil. The parameters of the suspension system such as shock absorber dimensions, pressure and volume of the fluid will affect the damping characteristics of an oleo-pneumatic shock absorber used in airplane. In this research, modeling and analysis of the effect of parameter changes in the oleo-pneumatic suspension system towards the damping force and the spring force and also the dynamic response of Boeing 747-400 passengers during the landing and takeoff process. The initial gas pressure ( in the oleo-pneumatic suspension system was varied from 1.2 Mpa until 2 MPa at a constant initial volume of gas that is equal to 2.752 x 10-3 m3. The initial gas volume was varied from 2.252 x 10-3 m3 until 3.252 x 10-3 m3 at a constant initial gas pressure that is equal to 1.6 MPa. And the cross-sectional area of orifice was varied from 6.412 x 10-4 m2 until 6.812 x 10-4 m2 with initial gas pressure ( and volume constant that is equal to 1.6 MPa and 2.752 x 10-3 m3. There are three types of gases used in the simulation of oleo-pneumatic suspension system that is nitrogen, carbondioxide, and dry air. In this research used sinusoidal and bump modified input. From oleo-pneumatic suspension system has been known that the smaller the cross-sectional area of the orifice , then the damping force generated will be even greater. The greater the initial pressure of gas ( used in the oleo-pneumatic suspension system, the spring force generated will be even greater. And the greater the initial volume of gas is used, the spring force generated will be even greater. In the airplane system with the addition of oleo-pneumatic suspension system, for input bump modified (landing conditions), all of the responses were transient responses and reached steady state less than 25 seconds. As for the sinusoidal input (takeoff conditions) with the takeoff speed of the airplane is equal to 196 knots = 362.992 km/h, the dynamic response of displacement, velocity and acceleration of the passengers reached steady state conditions before 15 seconds. From the three types of gases used in the simulation, the results of the RMS value for vibration acceleration of passengers were no complaints (comfortable) when compared to the standard ISO 2631.

Item Type: Thesis (Undergraduate)
Additional Information: RSM 621.904 Hes p
Uncontrolled Keywords: sistem suspensi, oleo-pneumatic shock absorber, karakteristik, respon dinamis, parameter.
Subjects: T Technology > TJ Mechanical engineering and machinery
Divisions: Faculty of Industrial Technology > Mechanical Engineering > 21201-(S1) Undergraduate Thesis
Depositing User: Users 13 not found.
Date Deposited: 11 Jan 2017 06:57
Last Modified: 26 Dec 2018 08:36
URI: https://repository.its.ac.id/id/eprint/1479

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