In this paper, the semi-empirical model, formulated in the earlier paper [1], was used to control engine exhaust emission under steady-state conditions. The presented optimization method enables us to find the values of engine control parameters that lead to minimization of nitrogen oxide emission. Moreover, the presented method ensures proper engine operating parameters such as mean indicated pressure, thermal efficiency and maximum pressure in the cylinder. Results of numerical calculations are compared with experiment data. An acceptable accuracy was achieved.
The problem of optimal driving techniques during fuel economy competition is considered. The kinetic model of the record wheeled vehicle is proposed. It is regarded as a particle moving on a trace with variable slope angle. Engine characteristics are taken into account. The fuel consumption is minimized as the vehicle goes over a given distance. The problem is formulated in optimal control. The direct pseudospectral Chebyshev’s method is employed. The motion of student’s vehicle representing the Faculty of Power and Aeronautical Engineering during Shell Eco-marathon in Nogaro, France, in 2006, is used as an example.
The paper presents the dynamic model of an A-frame, which is a kind of an offshore crane with a portal construction. The rigid finite element method (RFEM) has been used in discretization of the flexible substructure. An application of optimisation methods to define the drive function course of the hoisting winch is presented. The goal of the optimisation is to ensure stabilization of the load’s position. In order to achieve appropriate numerical effectiveness, the optimisation problem has been solved for a simplified model of an A-frame. Comparison of numerical results obtained for different types of objective functions and types of drive functions is presented in the paper as well.
In this paper the authors present the test carried out to obtain the uniform velocity distribution at the outlet cross section of flow fan. In the investigations the inner flat vane mounted inside of the impeller has been applied. For various angular position of the inner vane, one obtained different flow structures as well as different velocity distributions. The analysis of the obtained results is presented in form of graphs shown in 10 figures, juxtaposing flow phenomena with velocity distributions. Numerical flow simulation with the use of Flo++ program based on the Finite Volume Method was carried out.
In the paper, the author analyses a model of a ring pack motion on an oil film. The local thickness of the oil film can be compared to the height of the combined surface roughness of a cylinder liner and piston rings. Equations describing the mixed lubrication problem based on the empirical mathematical model formulated in works by Patir, Cheng [6, 7] and Greenwood, Tripp [3] have been combined [13] and used in this paper. A model of a gas flow through the labyrinth seal of piston rings has been developed [14,16]. In addition, models of ring twist effects and axial ring motion in piston grooves have been applied [15,16].
In contrast to the previous papers of the author, an experimental verification of the main parts of developed mathematical model and software has been presented. A relatively good compatibility between the experimental measurements and calculated results has been achieved.
The quest for airframe weight reduction results in a careful dimensioning cross section areas of structural airframe components depending on the anticipated loading. In the case of flanges of polymeric laminate spars subjected to tension such a dimensioning can be done by means of appropriate ply dropping along the spar flanges. A method for an effective calculation of the number of plies that can be cut off at the cross-section under consideration without excessive stress concentration resulted has been presented. The method takes advantage of the Linear Fracture Mechanics tools combined with simple finite element calculations. In addition, experimental data needed can be easily obtained with the use of inexpensive specimens that are simple for manufacturing and testing.
Editor-in-Chief
Prof. Marek Wojtyra, Warsaw University of Technology, Poland
Editorial Board
Prof. Krzysztof Arczewski, Warsaw University of Technology, Poland
Prof. Janusz T. Cieśliński, Gdańsk University of Technology, Poland
Prof. Antonio Delgado, LSTM University of Erlangen-Nuremberg, Germany
Prof. Peter Eberhard, University of Stuttgart, Germany
Prof. Jerzy Maciej Floryan, The University of Western Ontario, Canada
Prof. Janusz Frączek, Warsaw University of Technology, Poland
Prof. Zbigniew Kowalewski, Institute of Fundamental Technological Research, Polish Academy of Sciences, Poland
Prof. Zenon Mróz, Institute of Fundamental Technological Research, Polish Academy of Sciences, Poland
Prof. Andrzej J. Nowak, Silesian University of Technology, Poland
Dr. Andrzej F. Nowakowski, The University of Sheffield, United Kingdom
Prof. Jerzy Sąsiadek, Carleton University, Canada
Prof. Jacek Szumbarski, Warsaw University of Technology, Poland
Prof. Tomasz Wiśniewski, Warsaw University of Technology, Poland
Prof. Günter Wozniak, Chemnitz University of Technology, Germany
Assistant to the Editor
Małgorzata Broszkiewicz, Warsaw University of Technology, Poland
Editorial Advisory Board
Prof. Alberto Carpinteri, Politecnico di Torino, Italy
Prof. Fernand Ellyin, University of Alberta, Canada
Prof. Feng Gao, Shanghai Jiao Tong University, P.R. China
Prof. Emmanuel E. Gdoutos, Democritus University of Thrace, Greece
Prof. Gregory Glinka, University of Waterloo, Ontario, Canada
Prof. Andrius Marcinkevicius, Vilnius Gedeminas Technical University, Lithuania
Prof. Manuel José Moreira De Freitas, Instituto Superior Tecnico, Portugal
Prof. Andrzej Neimitz, Kielce University of Technology, Poland
Prof. Thierry Palin-Luc, Arts et Métiers ParisTech, Institut Carnot Arts, France
Prof. Andre Pineau, Centre des Matériaux, Ecole des Mines de Paris, France
Prof. Narayanaswami Ranganathan, LMR, Ecole Polytechnique de l'Université de Tours, France
Prof. Jan Ryś, Cracow University of Technology, Poland
Prof. Adelia Sequeira, Technical University of Lisbon, Portugal,
Prof. Józef Szala, University of Technology and Life Sciences in Bydgoszcz, Poland
Prof. Edmund Wittbrodt, Gdańsk University of Technology, Poland
Prof. Jens Wittenburg, Karlsruhe Institute of Technology, Germany
Prof. Stanisław Wojciech, University of Bielsko-Biała, Poland
Language Editor
Lech Śliwa, Institute of Physiology and Pathology of Hearing, Warsaw, Poland
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Archive of Mechanical
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