OPTIMASI STRUKTUR UNTUK MENDAPATKAN FREKUENSI ALAMI YANG TERPISAHKAN SECARA OPTIMAL
Abstract
In obtaining the dynamic response of a dynamic system, its uncouple modal equation of movement simplifies the usage of superposition modal method. This paper proposes a strategy to obtain the uncouple modal equation based an hypotheses of Basile : "Although the presence of modal-damping-couple, the modal equations of movement are dynamically uncoupled for a structure having small damping coefficient if its natural frequencies are well-separated"(1). This hypotheses is justified by several authors, i. e. by Hasselman(1). Thus, by separating the natural frequencyof a dynamic system using Hasselman criteria, it is expected that the modal equation of movement will become uncoupled. The separation of the natural fiequency is done by optimization method which is conducted by using the finite element software ANSYS.
References
Imbert, J.F., Analyse des Structures par Elements Finis, Cepadeus-Editions, (1984).
Erwin Kreyszig, 1993, Advanced Engineeering Mathematics, John Wiley & Sons, Inc.,New York, (1993).
Duane Hanselman, Bruce Linlefield, The Student Edition of MATLAB, Prentice Hall, Inc. New Jersey, (1997).
Roy R. Craig, Structural Dynamics : An Introduction to Computer Methods, John Wiley & Sons, New York, (1981).
Garret N. Vanderplaats, Numerical Optimization Techniques For Engineering Desain with Application, McGraw-Hill Book Company, (1983).
ANSYS-PC/LINEAR 4.3 User's Manuals Supplement AI, Swanson Analysis Systems, Inc, (1990).
Raphael T. Hafika, Zafer Gurdal, Elements of Structural Optimization, Kluwer Academic Publishers, (1992).
Dannawan Harsokoesoemo, Satryo Sumantri B., "Diktat Kuliah Metoda Elemen Hingga" , Jurusan Teknik Mesin ITB, (1995).
Uri Kirsch, Optimum Structural Desain, McGraw-Hill Book Company, (1981).
William T. Thomson, Theory of Vibration with Application, Prentice-Hall, (1993).
