Engineering Computations: Volume 39 Issue 4

Study of isolation effectiveness of nuclear reactor building with three-dimensional seismic base isolation

Xiuyun Zhu, Rong Pan, Jianbo Li, Gao Lin

In recent years, three-dimensional (3D) seismic base isolation system has been studied extensively. This paper aims to propose a new 3D combined isolation bearing (3D-CIB) to…

High-concentration time–frequency analysis for multi-component nonstationary signals based on combined multi-window Gabor transform

Qiang Wang, Chen Meng, Cheng Wang

This study aims to reveal the essential characteristics of nonstationary signals and explore the high-concentration representation in the joint time–frequency (TF) plane.

Fourth kind Chebyshev Wavelet Method for the solution of multi-term variable order fractional differential equations

Arzu Turan Dincel, Sadiye Nergis Tural Polat

Multi-term variable-order fractional differential equations (VO-FDEs) are powerful tools in accurate modeling of transient-regime real-life problems such as diffusion phenomena…

Improved particle swarm optimization for mean-variance-Yager entropy-social responsibility portfolio with complex reality constraints

Xue Deng, Yingxian Lin

The weighted evaluation function method with normalized objective functions is used to transform the proposed multi-objective model into a single objective one, which reflects the…

Computation of erosion in a hydro turbine

Adel Ghenaiet

This study aims to investigate the trajectories of sand particles and erosion wear in a hydraulic turbine model.

Modelling, validation and parameter sensitivity of regenerative hydraulic-electric shock absorber

Min Zhang, Cheng Hu, Jingwei Gao, Peng Zheng

Suspension is a significantly important component for automotive and railway vehicles. Regenerative hydraulic-electric shock absorbers (RHSA) have been proposed for the purpose of…

Construction of surrogate models for predicting the buckling strength of stiffened panels through DoE and RSM methods

Nikolaos Papanikolaou, Konstantinos Anyfantis

Experimental mid/large scale testing of ship-like stiffened panels in compression is a quite expensive exercise that is not standard. Numerical simulations are preferred instead…

Influences on unstable hydraulic fractures: propagation of adjacent multiple perforations and bedded interfaces in multilayered reservoir via FE-DE model

Yongliang Wang, Nana Liu, Xin Zhang, Xuguang Liu, Juan Wang

Simultaneous hydrofracturing of multiple perforation clusters in vertical wells has been applied in the stimulation of hydrocarbon resources reservoirs. This technology is…

Solution of mass-spring-damper fractional systems using Caputo derivative and orthogonal collocation

Juliana V.C.F. Lima, Fran Sérgio Lobato, Valder Steffen Jr

In this contribution, the solution of Mass-Spring-Damper Systems in the fractional context by using Caputo derivative and Orthogonal Collocation Method is investigated. For this…

Analysis and numerical solution of dynamic Jiles–Atherton model applied to hysteresis modeling for giant magnetostrictive materials

Ce Rong, Zhongbo He, Guangming Xue, Guoping Liu, Bowen Dai, Zhaoqi Zhou

Owing to the excellent performance, giant magnetostrictive materials (GMMs) are widely used in many engineering fields. The dynamic Jiles–Atherton (J-A) model, derived from…

Adaptive output-feedback robust active disturbance rejection control for uncertain quadrotor with unknown disturbances

Nigar Ahmed, Syed Awais Ali Shah

In this research paper, an adaptive output-feedback robust active disturbance rejection control (RADRC) is designed for the multiple input multiple output (MIMO) quadrotor…

Numerical simulation of coupled liquid water, stress and heat for frozen soil in the thawing process

Wei Xiao, Enlong Liu, Xiao Yin, Guike Zhang, Chong Zhang, Qihao Yu

The purpose of this paper is to perform the thermo-hydro-mechanical (THM) numerical analysis in order to study the thawing process for frozen soil and to predict the thawing…

Transient thermo-elasto-hydrodynamic analysis of a bidirectional thrust bearing in start-up and shutdown processes

Jingwei Cao, Liming Zhai, Yongyao Luo, Soo-Hwang Ahn, Zhengwei Wang, Yan Liu

The purpose of this paper is to reveal the transient thermo-elasto-hydrodynamic lubrication mechanism of a bidirectional thrust bearing in a pumped-storage unit, and to propose…

Fatigue damage in bending of reinforced concrete frames using non-destructive tests for dynamic strength of the cylinder

Dragan D. Milašinović, Aleksandar Landović, Danica Goleš

The purpose of this paper is to contribute to the solution of the fatigue damage problem of reinforced concrete frames in bending.

Use of empirical and diffusion models in the description of the process of water absorption by rice

Joan Carlos Alves Pereira, Wilton Pereira da Silva, Renato Costa da Silva, Cleide Maria Diniz P.S. e Silva, Josivanda Palmeira Gomes

To describe water absorption by the rice grains over time, diffusion and empirical models were used. Also, an optimization software was developed in this study to determine…

Nonlinear dynamics of a spur gear pair with tooth root crack based on an amplitude modulation function

Nan Gao, Shiyu Wang, Muhammad Asad Ur Rehman Bajwa

Gear transmissions are widely utilized in practice. This paper aims to uncouple the crack feature from the cracked time-varying mesh stiffness (TVMS) and investigate the effects…

A methodology for loss and performance assessment of a variable geometry turbocharger turbine through a new meanline FORTRAN program

Ahmed Ketata, Zied Driss

Variable geometry turbine (VGT), a key component of modern internal combustion engines (ICE) turbochargers, is increasingly used for better efficiency and reduced exhaust gas…