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All Journal Rekayasa Mesin Mesin Ge-STRAM: Jurnal Perencanaan dan Rekayasa Sipil
Rachman Setiawan
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Civil Engineering, Building, Construction & Architecture Mechanical Engineering Transportation

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PENGGUNAAN TEKNIK APROKSIMASI (METAMODELING) UNTUK MENYEDERHANAKAN MODEL ELEMEN HINGGA DALAM PROSES OPTIMASI Rachman Setiawan
Mesin Vol. 20 No. 1 (2005)
Publisher : Mesin

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Abstract

Complex modelling using Finite element method in iterative optimisation process often yield expensive computation. One of the solution is to replace the expensive finite element analysis with a mathematically simpler model, that is using an approximate relations (Metamodel). Here, the approach is used to characterise the mechanical properties of an anisotropic plate from their corresponding natural frequencies. Radial basis functions model has been chosen for the Metamodel to approximate the finite element model generated in ANSYS 6.1 software. Characterisation process is regarded as an optimisation problem with the objective is to minimise the accumulation of differences between the target frequencies and the updated ones. The use of Metamodel shorten the computation time as well as increase the likelihood of reaching the global minimum. In general, the overall result is reasonably good to predict the mechanical properties of anisotropic plates.
KARAKTERISTIK MODUL PENYERAP ENERGI IMPAK MEKANISME INTERNAL INVERSION DAN AXIAL SPLITTING Rachman Setiawan; Muhammad Hisyam Amir; Bambang Sugiharto; Sigit Fajrianto
Mesin Vol. 21 No. 2 (2006)
Publisher : Mesin

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The application of crashworthiness technology to a vehicle has a main objective of protecting the passenger or cargo from the effects of impact/collision. One of the strategies is by using impact energy absorbing (IEA) modules. Two of the alternatives of IEA modules are metallic tubes with internal inversion and controlled axial splitting mechanism. This paper presents both numerical and experimental approaches to understand the characteristics of the two mechanisms, before using them in design phase. LS-Dyna was used as the numerical simulation software for drop test case. The result of simulation is presented as the relationships between geometrical parameters and the crashworthiness parameters, e.g. impact energy and response force. Some cases are compared with quasi-static and drop test results.
Co-Authors Bambang Sugiharto Kariem, M. Agus Leonardo Gunawan, Leonardo Muhamad Abdurrochman Muhammad Hisyam Amir Muzakki, Sofyan Sigit Fajrianto Vani Virdyawan