Sembiring, Alexander and Lubis, Asnawi and Akmal, Jamiatul (2020) Numerical Study for Comparison of Pseudo Modal and Direct Method in Predicting Critical Speed of Coaxial Dual Rotor System. In: Engineering Science and Technology International Conference (Estic2020), 9 September 2020, Padang, Sumatera Barat. (In Press)

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Abstract

- Machines with high speed rotation, high power, and lighter weight are the challenge in design of modern rotation machinery. In analysis of coaxial dual rotor system, the problem leads to a multi-degree of freedom system (multi-DOF). The resulting equation of motion cannot be solved analytically. For multi-DOF system, numerical method has to be implemented. In this study, the equations of motion of co-axial dual rotor system was solved numerically using MATLAB programming language. This study compares the result of two methods used: the pseudo-modal method and the direct method, with the aim of getting the most effective method in predicting critical rotational speed by plotting Campbell diagram. It was found that the difference in the value of critical speeds between Pseudo Modal and the Direct Method is 0%-9,56% for the first 6 lowest frequencies and 0.09%-3.58% for the first 8 lowest frequencies.

Item Type:	Conference or Workshop Item (Paper)
Uncontrolled Keywords:	Coaxial dual rotor, Campbell diagram, Direct Method, Pseudo Modal
Subjects:	T Technology > TJ Mechanical engineering and machinery
Divisions:	Fakultas Teknik (FT) > Prodi Magister Teknik Mesin
Depositing User:	Dr Asnawi Lubis
Date Deposited:	16 Nov 2020 15:06
Last Modified:	16 Nov 2020 15:06
URI:	http://repository.lppm.unila.ac.id/id/eprint/25517

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