Central European Journal of Engineering
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Three dimensional simulation of air permeability of single layer woven structures
Central European Journal of Engineering - Tập 1 - Trang 430-435 - 2011
The paper deals with a CFD based study of the transverse permeability of a textile woven structure. The reported numerical investigation is preconditioned by both previous experimental and CFD study on jet systems. It is also based on detailed experimental investigation of the porous structure of single layer woven fabrics, made of staple fiber yarns. The flow in through-thickness direction of the......
Constructal design applied to the elastic buckling of thin plates with holes
Central European Journal of Engineering - Tập 3 - Trang 475-483 - 2014
Elastic buckling is an instability phenomenon that can occur if a slender and thin plate is subjected to axial compression. An important characteristic of the buckling is that the instability may occur at a stress level that is substantially lower than the material yield strength. Besides, the presence of holes in structural plate elements is common. However these perforations cause a redistributi......
Erratum to Central European Journal of Engineering, Volume 4, Issue 1
Central European Journal of Engineering - Tập 4 - Trang 209-209 - 2014
Paper by M. Ajay Kumar, N. V. Srikanth, et al. “An adaptive neuro fuzzy inference system controlled space cector pulse width modulation based HVDC light transmission system under AC fault conditions” in Volume 4, Issue 1, 27–38/March 2014 doi: 10.2478/s13531-013-0143-4 contains an error in the title. The correct title is presented below
Low temperature impact toughness of the main gas pipeline steel after long-term degradation
Central European Journal of Engineering - Tập 4 - Trang 408-415 - 2014
The correlation of microstructure, temperature and Charpy V-notch impact properties of a steel 17G1S pipeline steel was investigated in this study. Within the concept of physical mesomechanics, the dynamic failure of specimens is represented as a successive process of the loss of shear stability, which takes place at different structural/scale levels of the material. Characteristic stages are anal......
On the critical forcing amplitude of forced nonlinear oscillators
Central European Journal of Engineering - Tập 3 - Trang 764-770 - 2013
The steady-state response of forced single degree-of-freedom weakly nonlinear oscillators under primary resonance conditions can exhibit saddle-node bifurcations, jump and hysteresis phenomena, if the amplitude of the excitation exceeds a certain value. This critical value of excitation amplitude or critical forcing amplitude plays an important role in determining the occurrence of saddle-node bif......
Macroeconomic analysis of road vehicles related environmental pollution in Hungary
Central European Journal of Engineering - Tập 4 - Trang 186-191 - 2014
The article aims to examine the relationship between road transport and macro economy, especially the use of fossil energy in transport sector. Nowadays environmental pollution is a key issue on the EU level as well as in Hungary. Lots of effort have been already done in order to decrease emissions in road transport, but a lot more need to be done. The article aims to prove that the only possible ......
An estimation of critical buckling strain for pipe subjected plastic bending
Central European Journal of Engineering - Tập 4 - Trang 326-333 - 2014
An approach for estimating critical buckling strain of pipe subjected plastic bending is established in the present paper. A rigid — perfectly plastic material model and cross section ovalization of pipe during bending are employed for the approach. The energy rates of the ovalised pipe bending and the cross section ovalising are proposed firstly. Furthermore, these energy rates are combined to pe......
Type-2 fuzzy logic control of a 2-DOF helicopter (TRMS system)
Central European Journal of Engineering - Tập 4 - Trang 303-315 - 2014
The helicopter dynamic includes nonlinearities, parametric uncertainties and is subject to unknown external disturbances. Such complicated dynamics involve designing sophisticated control algorithms that can deal with these difficulties. In this paper, a type 2 fuzzy logic PID controller is proposed for TRMS (twin rotor mimo system) control problem. Using triangular membership functions and based ......
Fabrication and characterization of polysilane: PCBM bulk heterojunction solar cells
Central European Journal of Engineering - Tập 3 - Trang 165-169 - 2013
Polysilane/fullerene bulk heterojunction solar cells were fabricated on indium tin oxide electrodes by a spin-coating method, and performance and microstructures of the solar cells were investigated. Decaphenylcyclopentasilane (PDPS), polymethlyphenylsilane (PMPS) and [6,6]-phenyl C61-butyric acid methyl ester (PCBM) were used for the solar cells. The conversion efficiencies of PDPS:PCBM solar cel......
Methodology for evaluate the form deviations for formula one nose car
Central European Journal of Engineering - Tập 4 - Trang 148-154 - 2014
The paper presents a measuring strategy for a Formula One car using a Coordinate Measuring Machine (CMM) and a 3D laser scanning devices. The measurement procedures outlined the dimensional deviation of the CAD model and prototype made of composite material. The authors present two methods for the determination of symmetry for components of a Formula One car based on measuring and 3D scanning.
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