This paper presents the results of Pilot Assisting Module research performed on two light aircraft flight simulators developed in parallel at Brno University of Technology, Czech Republic, and Rzeszow University of Technology, Poland. The first simulator was designed as an open platform for the verification and validation of the advanced pilot/aircraft interface systems and inherited its appearance from the cockpit section of the Evektor SportStar. The second flight simulator, the XM-15, has been built around the cockpit of a unique agriculture jet Belfegor. It introduced a system architecture that supports scientific simulations of various aircraft types and configurations, making it suitable for conceptual testing of Pilot Assisting Module. The XM-15 was initially designed to support research on advanced flight control systems, but due to its continuing modernization it evolved into a hardware-in-the-loop test-bed for electromechanical actuators and autopilot CAN based controller blocks. Pilot-in-the-loop experiments of proposed Pilot Assisting Module revealed favorable operational scenarios, under which the proposed system reduces the cockpit workload during single pilot operations.
Commonly used computations of basic rating life of a bearing system are based on the ISO 281:1990 standard. These computations include dynamic load capacity of a given bearing, its effective load and average rotational speed, whereas they omit distribution of external load acting upon particular rolling parts depending, among other things, on: - displacement in bearing (displacements in three directions and declination in two planes), - slackness in bearings. The aim of the presented theoretical research is to solve a problem of fatigue life of a ball bearing taking into consideration displacement in bearing resulting from elasticity of a three-bearing shaft, elasticity of bearings and their internal slackness.
This paper presents the bases of a new method of monitoring technical condition of turbomachine blades during their operation. The method utilizes diagnostic models such as a quotient of amplitude amplification and a phase shift of diagnostic signal y(t) which is a result of blade operation as well as a signal x(t) of blade environment while a blade tip approaches a sensor, amplitude amplification and phase shift of these signals while the blade tip moves away from the sensor. The adopted diagnostic models indirectly take into account the existing environment of a blade, represented by the signal x(t), without the need to measure it. Thus, the model is sensitive to the changes in technical condition of blades and practically intensive to a change in environment. The suggested method may prove very important in diagnostics of rotor blades during turbomachines operation (compressors, turbines etc.).
This paper contains the full way of implementing a user-defined hyperelastic constitutive model into the finite element method (FEM) through defining an appropriate elasticity tensor. The Knowles stored-energy potential has been chosen to illustrate the implementation, as this particular potential function proved to be very effective in modeling nonlinear elasticity within moderate deformations. Thus, the Knowles stored-energy potential allows for appropriate modeling of thermoplastics, resins, polymeric composites and living tissues, such as bone for example. The decoupling of volumetric and isochoric behavior within a hyperelastic constitutive equation has been extensively discussed. An analytical elasticity tensor, corresponding to the Knowles stored-energy potential, has been derived. To the best of author's knowledge, this tensor has not been presented in the literature yet. The way of deriving analytical elasticity tensors for hyperelastic materials has been discussed in detail. The analytical elasticity tensor may be further used to develop visco-hyperelastic, nonlinear viscoelastic or viscoplastic constitutive models. A FORTRAN 77 code has been written in order to implement the Knowles hyperelastic model into a FEM system. The performace of the developed code is examined using an exemplary problem.
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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