Edwar Yazid

Edwar Yazid
Indonesian Institute of Sciences | LIPI · Division of Vibration Electric (Vibrotric)

PhD

About

38
Publications
2,141
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85
Citations

Publications

Publications (38)
Article
Identification of the first and second-order surge motion transfer functions of a truss spar platform from model test data is presented in this paper. The identification is carried out by estimating the time-varying kernels coefficients of a second-order Volterra model. The coefficients are estimated using proposed method, named particle swarm opti...
Article
Identification of transfer functions from surge motion response of a semisubmersible platform from model test data is presented in this paper. The identification is carried out by estimating the time-varying model coefficients of a time-varying NARX (TVNARX) model. The coefficients are estimated using proposed method, named artificial bee colony-ba...
Article
Full-text available
For generating electricity, direct-drive wave energy converters (WECs) with linear permanent magnet generators (LPMGs) have advantages in terms of efficiency, simplicity, and force-to-weight ratio over WEC with rotary generators. However, the converter’s work under approaching-real wave conditions should be investigated. This paper studies the perf...
Article
Full-text available
In the prediction of accurate wave force, the consideration of short-crested wave is important in representing the actual ocean condition. Owing that, nonlinear wave characteristics are expected to change the flow properties when the wave passes the structures, which showing these characteristics are crucial to be accounted. However, literature rep...
Article
Identification of the time-varying linear and nonlinear impulse response functions (LIRF and QIRF) of moored or tethering floating structures is deemed a very challenging work because of nonlinearity and nonstationarity. This paper proposes an identification method, namely a time domain parametric Volterra model based on Cuckoo search optimized Kal...
Conference Paper
This paper analyzes the performance of point absorber wave energy converter (WEC) system using linear permanent magnet generator (LPMG) under regular wave condition. First, a WEC design was modeled. It consists of a floater as wave's mechanical energy capturer, coupled to an LPMG as power take-off system. Then, operation of the WEC system was simul...
Article
Trajectory tracking control of a quadcopter drone is a challenging work due to highly-nonlinear dynamics of the system, coupled with uncertainties in the flight environment (e.g. unpredictable wind gusts, measurement noise, modelling errors, etc). This paper addresses the aforementioned research challenges by proposing evolutionary algorithms-based...
Article
Full-text available
This study proposes the use of the genetic algorithm (GA) method in hydraulic turbine optimization for renewable energy applications. The algorithm is used to optimize the performance of a two-dimensional hydrofoil cascade for an axial-flow hydraulic turbine. The potential flow around the cascade is analyzed using the surface vorticity panel method...
Article
Full-text available
Controlling the rotational speed of brushless DC (BLDC) motor is an essential task to improve the transient and the steady state performances under loaded condition. Rotational speed control of BLDC motor using genetic algorithm optimized proportional-derivative (PD) controller to form what the so-called the genetic algorithm-PD (GA-PD) controller...
Patent
METODA DAN ALAT UNTUK MENGUMPULKAN ENERGI IMPAK DARI TEMBAKAN SENAPAN Invensi ini berupa suatu metoda dan alat untuk untuk mengumpulkan energi ketika senapan melepaskan tembakan, dengan cara memanfaatkan energi dari hentakan tembakan senapan yang disalurkan ke massa dinamik yang terpasang pada dudukan pemegang senjata, yang kemudian akan menjadi ga...
Article
Controlling the rigid gantry crane system is challenging due to it being an under-actuated system. This paper addresses the challenge by presenting the fuzzy logic controller (FLC) with Mamdani and the 1 st -order Takagi Sugeno Kang (TSK) types presenting it in this comparative study. Both controllers are proposed to control the position of the cra...
Patent
Invensi ini berkaitan dengan suatu dudukan pemegang senjata dua derajat kebebasan yang dilengkapi dengan redaman pengendali getaran akibat hentakan tembakan senapan. Pada invensi ini, sistem senjata didesain untuk dapat dilepas ataupun diganti dengan mounting senjata lain sesuai dengan ukuran dan tata letak pin masing-masing senjata laras panjang y...
Article
Full-text available
Characterization of finite measured signals is a great of importance in dynamical modeling and system identification. This paper addresses an approach for characterization of measured random vibration signals where the approach rests on a method called empirical mode decomposition (EMD). The applicability of proposed approach is tested in one numer...
Article
This work presents an approach to predict the low frequency and wave frequency responses (LFR and WFR) of a floating structure using Kalman smoother adaptive filters based time domain Volterra model. This method utilized time series of a measured wave height as system input and surge motion as system output and used to generate the linear and nonli...
Article
Full-text available
This paper proposes basis functions based time domain Volterra model for nonlinear system identification. The Volterra kernels are expanded by using complex exponential basis functions and estimated via genetic algorithm (GA). The accuracy and practicability of the proposed method are then assessed experimentally from a scaled 1:100 model of a prot...
Article
Full-text available
This work presents a newapproach for nonlinear system identification of floating structures using time-varyingautoregressive with exogenous input (TVARX)–based Volterra model. This methodutilizes time series of measured wave heights as system input and surge motionas system output. Solution to the proposed approach is also proposed via Kalmansmooth...
Conference Paper
ABSTRACT The purpose of this paper is to propose and investigate a new approach for estimating response transfer function of offshore structures with wave as excitation input. The approach is based on time-varying autoregressive with exogenous input (TVARX) model. This method is virtually unexplored in offshore engineering field, as a number of...
Article
Full-text available
This paper presents a technique for using a parametric approach for modal properties estimation of a floating offshore structure. The technique utilizes empirical mode decomposition (EMD)-based time-varying autoregressive (TVAR) model, which is an extended form of the well-known AR model. Input for TVAR model is surge motion as system response,...
Article
The purpose of this study is to propose and investigate a new approach for extracting spectral information of motion response of offshore structures. The approach is based on applying Time-varying Autoregressive (TVAR) model. This study is virtually unexplored in offshore engineering field. In the literatures, a number of works have shown that spec...
Conference Paper
The purpose of this paper is to propose and investigate a new approach for estimating field measurements based response amplitude operators (RAOs) for offshore structures. The approach is based on applying time-varying autoregressive (TVAR) model. This work is virtually unexplored in offshore engineering field. In the literatures, a number of works...
Conference Paper
This paper presents the results of application of the time-varying autoregressive (TVAR) model for spectral analysis of ocean wave elevation. This work is virtually unexplored in offshore engineering field. The method is then applied to field measurements based ocean wave elevation. Its performance is compared with short time Fourier transformation...
Article
Full-text available
Mathematical modeling of a moving planar payload pendulum on elastic portal framework is presented in this paper. The equations of motion of such a system are obtained by modeling the portal frame using finite element in conjunction with moving finite element method and moving planar payload pendulum by using Lagrange’s equations. The generated equ...
Article
Full-text available
In this paper, dynamic behavior of non-slewing-luffing crane type, namely gantry crane is investigated by introducing the flexibility of crane framework and hoist cable. The dynamic model of such system is obtained by modeling crane framework using finite element method and gantry crane system by using Lagranges equations. The equations of motion c...
Article
Vibration analysis of gantry crane system subjected to swinging motion of payload by considering the flexibility of crane framework and hoist cable is presented in this study. The equations of motion of such a system are coupled dynamic problem, where the dynamic model is obtained by modeling the dynamics of crane framework using finite element met...

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Project (1)
Project
Ocean Surveillance