Dheninta, Alvibrionasis Aseptis (2017) Perancangan Ulang Electrodynamic Shaker Untuk Pengujian Dinamis Sampel Plat Kap (Engine Hood) Mobil. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Perkembangan dalam dunia industri khususnya di bidang
Sains dan Teknologi memberikan banyak perubahan dalam kehidupan manusia salah satunya pada dunia otomotif dimana diketahui banyak sekali jenis dan tampilan mobil. Acuan pengembangan dalam suatu mobil ada pada bentuk bodinya, bentuk bodi yang aerodinamis dapat mengurangi hambatan aerodinamika dan mengoptimalkan kinerja mesin serta stabilitas kendaraan. Aspek aerodinamika ini sangat didukung dari bentuk bagian kap (engine hood) mobil yang merupakan bagian dari
bodi mobil yang sangat menentukan besarnya gaya hambat karena letaknya yang berada di bagian depan. Selain karena gaya aerodinamis, interaksi mobil dan jalan dapat memicu terjadinya kegagalan pada bagain kap mobil seperti terjadi bending. Kegagalan tersebut dapat dihindari dengan melakukan analisa karakteristik dinamis pada bagian kap mobil dan dilakukan modal testing menggunakan electrodynamic shaker.
Pemilihan electrodynamic shaker yang sesuai adalah hal sangat penting untuk mendapatkan data modal testing dengan akurasi tinggi. Pada tugas akhir ini, dilakukan perancangan ulang electrodynamic shaker untuk mengetahui respon dinamis sampel plat kap mobil berdasarkan parameter dan karakteristik dinamis. Rancangan electrodynamic shaker yang dibuat, disesuaikan agar respon perpindahan yang diterima oleh sampel plat kap mobil
kurang dari atau sama dengan defleksi maksimum yang dapat diterima sampel plat kap saat ditinjau peak value-nya. Electrodynamic shaker yang dirancang memiliki sistem translasi dan simulasi dilakukan menggunakan input sinusoidal. Perancangan electrodynamic
shaker yang digunakan, diutamakan pada fungsi atau fenomena dinamis, sehingga dalam tugas akhir ini akan dicari nilai konstanta stiffness dari electrodynamic shaker dan konstanta redaman yang sesuai untuk pengujian sampel plat kap dengan spesifikasi tertentu. Input arus yang digunakan adalah sebesar 12.5 A dengan frekuensi listrik sebesar 50Hz. Pada tugas akhir ini pula, dilakukan variasi nilai arus yaitu sebesar 7, 9 dan 11 A. Selain itu, variasi juga dilakukan pada material objek uji yakni menggunakan AISI Steel 1008 dan Aluminium 7075-0 dengan dimensi ukuran yang berbeda. Dari analisa yang telah dilakukan, didapatkan ukuran tebal dari flexible support sebesar 0.00635m (0.25 in) dengan nilai konstanta stiffness electrodynamic shaker sebesar 3500 N/m dimana material yang dipergunakan adalah jenis rubber. Besar nilai konstanta redaman yang didapatkan adalah sebesar 2356 Ns/m, dimana besar nilai redaman tersebut mewakili keseluruhan dari sistem electrodynamic shaker. Nilai redaman tersebut tidak
hanya diakibatkan oleh nilai viscous damping yang ada pada gap antara moving element yang ditempati oleh coil dan magnet saja, namun juga adanya pengaruh dari redaman lain berupa dissipated energy yang berasal dari sistem elektris maupun mekanis.
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Developments in the industrialized world, especially in the fields of science and technology provides a lot of changes in people's lives, one of which on the automotive world by which is known a
lot of types and appearance of the car. One of
The reference of the development in a car is in the shape of the body, the shape of the bodywork's aerodynamics can reduce aerodynamics drag and optimize engine performance and vehicle stability. Aspects of aerodynamics is highly supported from forms part of the
engine hood of the cars that are part of the car body
which largely determine the magnitude of drag due to its location which is in the front of the car. In addition to aerodynamic in teraction, The interaction of the car and the road could trigger the occurrence of failure on the hood of the car as going on bending. These failures can be avoided by performing a dynamic characteristic analysis on the hood of the car and carried out
using electrodynamic shaker modal testing. The selection of electrodynamic shaker that fit is very important to get the data with high accuracy.
In this final task, redesign of electrodynamic shakers
is happen to find out the dynamic response of a sample
license plate car hood based on dynamic parameters and characteristics. The design of electrodynamic shakers are made to response displacement of plate samples received by the hood of the car is less than or equal to the maximum deflection of acceptable sample plate hood when reviewed his peak value.
The Designed Electrodynamic shaker is having translation system and simulation that using sinusoidal inputs. The design of electrodynamic shakers are used, preferably on a function or a
dynamic phenomenon, so this final project will find
for the value of the constant stiffness of electrodynamic shaker and damping constants corresponding to test sample platehood with certain specifications. The current input used is A 12.5 with a frequency of 50 Hz electricity. in this final task, the current value variation
done varies to 7, 9 and 11 A. In addition, the variations are also carried out on the test object using material AISI Steel and 1008 Aluminium 7075-0 with different size of dimensions. From the analysis that has been performed, the obtained size thickness of flexible support of 0.00635 m (0.25 in) with an electrodynamic shaker stiffness constants of 3500 N/m where the material used is a type of rubber. The amount of damping constants obtained are of 2356 Ns/m, where the value represents the overall attenuation of electrodynamic shaker systems. The
values of damping are not only caused by viscous damping value that exists in the gap between the moving element occupied by coil and magnet, but also there is the influence of other form of damping dissipated energy which comes from the electrical system as well as mechanical.
| Item Type: | Thesis (Undergraduate) |
|---|---|
| Additional Information: | RSM 621.381 531 Dhe p-1 |
| Uncontrolled Keywords: | Electrodynamic Shaker; Engine Hood; Aerodinamis; Modal Analysis; Peak Value; Respon Dinamis; Electrodynamic Shakers; Engine Hood; Aerodynamic; Modal Analysis; Peak Value; The Dynamic Response |
| Subjects: | Q Science > QC Physics > QC631.D29 Electrodynamics. T Technology > TJ Mechanical engineering and machinery T Technology > TL Motor vehicles. Aeronautics. Astronautics > TL521 Aerodynamics, Hypersonic. |
| Divisions: | Faculty of Industrial Technology > Mechanical Engineering > 21201-(S1) Undergraduate Thesis |
| Depositing User: | Dheninta Alvibrionasis Aseptis |
| Date Deposited: | 23 Feb 2018 02:38 |
| Last Modified: | 24 Sep 2020 06:56 |
| URI: | http://repository.its.ac.id/id/eprint/50254 |
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