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Olshevskiy, Alexander,Olshevskiy, Alexey,Kim, Chang-Wan,Yang, Hyun-Ik Swets and Zeitlinger 2018 Vehicle system dynamics Vol.56 No.10
<P>A white-box friction draft gear model has been developed. All components of the draft gear are considered. The distinctive feature of the model, as compared to its predecessor, is the transitional characteristic, which accounts for the effect of elastic deformations of the draft gear housing on the position of the friction wedge system components under loading. The adjustment of the model parameters for improved agreement with experimental data is discussed. The new model can be used in the simulation of shunting impacts for single cars and car groups represented by detailed finite-element models. An example of the simulation is presented and compared with experimental data obtained using a shunting hump test stand.</P>
Olshevskiy, Alexander,Kulinichev, Nikolai,Olshevskiy, Alexey,Kim, Chang-Wan,Yang, Hyun-Ik Elsevier 2017 Engineering failure analysis Vol.81 No.-
<P><B>Abstract</B></P> <P>In this study an efficient three-stage method for fatigue life assessment combining multibody dynamic analysis and finite element method is considered in the context of investigating the performance of a serial stilt sprayer. The proposed approach enables accurate simulation of dynamics for a vehicle subjected to real loads and finite element analysis for detailed models and does not lead to high computational complexity of the problem. The two-level finite element model is used for reducing computational costs of the analysis. The fatigue life of the stilt sprayer chassis frame is assessed on the basis of Palmgren–Miner damage theory. All stages of the study are described in detail. The research may be useful for mechanical engineers and specialists in strength and fatigue calculations.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Combining MBD and FEA enables real loads and high accuracy in stress evaluation. </LI> <LI> Using separate hybrid and finite element models reduce computational costs. </LI> <LI> Fatigue life is assessed on the basis of Palmgren–Miner damage theory. </LI> <LI> Predicted fatigue life is in a good agreement with results of field trials. </LI> </UL> </P>
Absolute nodal coordinate formulation of tetrahedral solid element
Olshevskiy, A.,Dmitrochenko, O.,Yang, H. I.,Kim, C. W. Springer Science + Business Media 2017 Nonlinear dynamics Vol.88 No.4
<P>A solid tetrahedral finite element employing the absolute nodal coordinate formulation (ANCF) is presented. In the ANCF, the mass matrix and vector of the generalized gravity forces used in the equations of motion are constant, whereas the vector of the elastic forces is highly nonlinear. The proposed solid element uses translations of nodes as sets of nodal coordinates. The tetrahedral shape of the element makes it suitable for modeling structures with complex shapes, and the small number of the degrees of freedom enables good performance and versatile application to problems of structural dynamics. The accuracy and convergence of the element were investigated using statics and dynamics benchmarks and a practical industry application.</P>
최명석,엄길호,곽관웅,Mai Duc Dai,Alexander Olshevskiy,김창완 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.5
Carbon nanotube (CNT) has recently received much attention due to its excellent electromechanical properties, indicating that CNT can be employed for development of Nanoelectromechanical system (NEMS) such as nanomechanical resonators. For effective design of CNT-based resonators, it is required to accurately predict the vibration behavior of CNT resonators as well as their frequency response to mass adsorption. In this work, we have studied the vibrational behavior of Multi-walled CNT (MWCNT) resonators by using a continuum mechanics modeling that was implemented in Finite element method (FEM). In particular, we consider a transversely isotropic hollow cylinder solid model with Finite element (FE) implementation for modeling the vibration behavior of Multi-walled CNT (MWCNT) resonators. It is shown that our continuum mechanics model provides the resonant frequencies of various MWCNTs being comparable to those obtained from experiments. Moreover, we have investigated the frequency response of MWCNT resonators to mass adsorption by using our continuum model with FE implementation. Our study sheds light on our continuum mechanics model that is useful in predicting not only the vibration behavior of MWCNT resonators but also their sensing performance for further effective design of MWCNTbased NEMS devices.