Koszalin University of Technology

www.tu.koszalin.pl
Koszalin, Poland

Koszalin University of Technology is a public technical university located in Koszalin and other cities, i.e. Chojnice.The institution was established in 1968 as Higher School of Engineering. The university obtained its present name and status in 1996.The university consists of the following faculties and institutes: Faculty of Civil and Environmental engineering Faculty of Economics and Management Faculty of Electronics and Computer Science Faculty of Mechanical Engineering Institute of Mechatronics, Nanotechnology and Vacuum TechniqueThe University is taking part in international exchange programmes, including Erasmus Programme. Wikipedia.

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Grant
Agency: European Commission | Branch: FP7 | Program: CP | Phase: ENERGY-2007-8.5-01 | Award Amount: 24.01M | Year: 2008

RENAISSANCE aims to develop a valid, reliable and integrated package of access and mobility measures for historic cities. These will make possible the rediscovery, preservation and enhancement of historic cities in Europe, together with the sustainable development of the local economy, to the benefit of visitors, residents and local business alike. RENAISSANCE brings together a group of historic/tourism cities across Europe that are in the vanguard of sustainable development. The RENAISSANCE cities have a strong reliance on heritage and tourism, which must marry environmental concerns, and sustainable access and mobility, with economic development. The partners face common problems: they are all historic cities with common layouts, and very valuable heritage to be preserved and enhanced. The partners also face unique local and regional challenges, including those brought about by social and economic integration within the EU. There is great added value in RENAISSANCE because the best practices that will be demonstrated will have resonance and relevance throughout the range of European Historic Cities.


Grant
Agency: European Commission | Branch: FP7 | Program: MC-IRSES | Phase: FP7-PEOPLE-2013-IRSES | Award Amount: 319.20K | Year: 2014

This proposal intends to deliver a basement for networking, staff exchanging and joint seminars and workshop between partners, who all deal with the problem of tribology aspects of micro-bearings including friction and lubrication of micro-pairs and friction of micro-joints in conical, spherical, cylindrical, parabolic and hyperbolical micro-bearings. The aim is shaping a focus group for further cooperation and joint scientific researches in the mentioned field. Microbearings are used today in different fields: bioengineering and biotechnology, industrial Micro Elements and Micro Systems (MEMS), Micro Power Units (MPU) and Micro Engines (ME), control systems and actuators and many others. Moreover, there are numerous analogies between bio-bearings (for example knees) and micro-bearings in their hydrodynamic behavior, lubrication processes and tribological aspects. Development of nanoscience and application of nanotechnology enabled the researchers to understand these properties better and deeper. However, still there are many unanswered questions regarding behavior and properties of these contact surfaces. More important is, of course, control of these features by an active method, as these physical parts are very small with very low time constants and conventional control systems are not able to satisfy the requirements like stability and quality of their response. The program includes staffs exchanging between partners from EU and TC based on an almost equal scheme, joint seminars and workshops, as well as final presentations for each period of Exchange.


Slowik A.,Koszalin University of Technology
IEEE Transactions on Industrial Electronics | Year: 2011

In this paper, an application of an adaptive differential evolution (DE) algorithm with multiple trial vectors for training artificial neural networks (ANNs) is presented. The proposed method is DE-ANNT+, which is a DE-ANN Training (DE-ANNT) modified by adding a multiple trial vectors technique. DE-ANNT+ allows one to train an ANN of arbitrary architectures, and it offers a nondifferentiable neuron activation function. In contrast to a basic DE algorithm, DE-ANNT+ possesses two modifications. In DE-ANNT+, adaptive selection of control parameters and a multiple trial vectors technique are introduced. Adaptive selection means that the number of required parameters of the algorithm is decreased. The multiple trial vectors technique increases the probability of generating a better solution because a greater number of temporary solutions is generated around the existing solutions. The DE-ANNT+ algorithm, with these two modifications, is used for ANN training to classify the parity-p problem. The results from the obtained algorithm have been compared with results from the following algorithms: an evolutionary algorithm, a DE algorithm without multiple trial vectors, gradient training methods, such as error back-propagation, and the Levenberg-Marquardt method. © 2009 IEEE.


Kuczynski W.,Koszalin University of Technology
International Journal of Heat and Mass Transfer | Year: 2012

Experimental research results are presented concerning the condensation of the R404A refrigerant in a five-channel multiport, which is fed in parallel and consists of mini-channels with internal diameter d = 0.90 and 3.30 mm. The research was performed in the presence of periodic instabilities generated in a frequency range from 5 to 0.2 Hz. During condensation in the multiport, the impact of instabilities is considerably stronger that in the case of single mini-channels. It was found that the temperature profiles and pressure profiles became deformed in each of the mini-channels of the multiport during the condensation process with the generated instabilities. These deformations decreased the value of heat transfer coefficient h, whose value depends on the diameter d of the multiport mini-channels, vapour quality x and the frequency f of the disturbances generated. © 2012 Elsevier Ltd. All rights reserved.


Regular surface texture may be generated by an unconventional grinding operation. The simple version of the method consists in grinding with the wheel having helical grooves which are deeper than the grinding depth. The wheel active surface is reproduced on the work-material in the form of regularly arranged grooves separated from each other. Regular surface texture consists of two components: deterministic, resulting from the nominal wheel surface, and stochastic, resulting from the random shape and arrangement of abrasive grains. Simulations and experiments revealed the limited contribution of the stochastic component of the surface structure of the work-material. Random arrangement of abrasive grains is important only at local (micro) level and affects the roughness of groove bottoms, while the dimensions and arrangement of the grooves are affected only to a minimal degree. © 2010 Elsevier B.V.


Hryniewicz Z.,Koszalin University of Technology
Soil Dynamics and Earthquake Engineering | Year: 2011

The effective procedure, which enables to discuss the dynamic response of Rayleigh beam resting on nonlinear viscoelastic foundation subjected to moving load, is developed. By employing the Adomian decomposition method in conjunction with coiflet expansion, the approximate closed form solution has been derived and condition for the convergence of the decomposition series has been introduced. To evaluate the accuracy of the approximate solution a local error index is defined. The presented new complex method is simple and efficient. The parametric study is performed and the influence of nonlinearity, load velocity, load frequency and the radius of gyration on the wave propagation in beam is investigated. The numerical results show that for the supercritical case, the linear model is stiffer giving rise to small displacement of the beam at the load passage. © 2011 Elsevier Ltd.


Maciejewski I.,Koszalin University of Technology
Journal of Sound and Vibration | Year: 2012

This paper presents an approach to the control system design of seat suspension systems for the active vibration attenuation. The paper presents the studies of the active vibration control strategy based on the reverse dynamics of force actuator and the primary controller. The multi-criteria optimization procedure is utilized in order to calculate the primary controller settings which subsequently define the vibro-isolation characteristics of active suspensions. As an example of the proposed control system design, the seat with a pneumatic suspension is investigated and its vibro-isolation properties are shaped by an appropriate selection of the controller settings. © 2011 Elsevier Ltd All rights reserved.


Friction and wear behaviors of W-C:H coatings with different tungsten contents sliding against bearing steel balls at different air humidities were investigated. The worn out surfaces of steel balls and coatings were analyzed with the aid of scanning electron microscopy (SEM) and Raman spectroscopy. A tribolayer composed of a graphite-like material mixed with tungsten and iron oxides was observed on the friction surfaces of the steel balls. The chemical and phase compositions of the tribolayer, which depend both on the tungsten content in coatings and air humidity, determine the tribological properties of the W-C:H coating in a frictional contact with bearing steel. At average air humidity (50%), those coatings that contain less than 10. at% of tungsten in a frictional contact with steel exhibit favorable tribological properties. The friction coefficient of frictional contacts under test reaches a low value (f~0.01) at a low air humidity and increases with humidity of up to ca. 0.2. The best tribological properties in a wide range of air humidity (5-90%) have been found for W-C:H coatings with the tungsten content between 2 and 5. at%. © 2012 Elsevier B.V.


Michalkiewicz J.,Koszalin University of Technology
IEEE Transactions on Neural Networks and Learning Systems | Year: 2012

This brief deals with the possibilities of using the modified Kolmogorov's neural network for the identification of non-linear dynamic systems, among them the Wiener and Hammerstein systems. The algorithm of training the network is simple, well convergent and with a small error of approximation. The modified neural network is characterized by a simple computer algorithm; it also omits complicated techniques of back propagation. The simulation results are shown to illustrate the modified Kolmogorov theorem. © 2012 IEEE.


The present paper covers the results of theoretical and experimental investigations concerning the propagation of a pressure wave triggered by external hydrodynamic influences in the condensation process of R134a refrigerant in pipe minichannels with an internal diameter of d = 0.64-3.30 mm. An ensemble-averaged gas-liquid two-fluid model with slippage of the velocity of phases was used when there was no thermodynamic equilibrium between the phases. The momentum and mass conservation equations were used for the analysis. In the model, the average values of parameters were assumed for the individual phases that describe the state of the system. The influence of the friction resistances of the flow in minichannels was also taken into consideration. The heat transfer between phases in the condensation process was described with Fourier's one-dimensional equation. With the use of the author's self-developed computational code, the following were defined in the MATLAB 8 program: the propagation velocity of the pressure wave cTPF, the attenuation coefficient η of this wave and the dependence of these quantities on the angular frequency ω of disturbances generated and on the void fraction α. The results of the model calculations were compared with the results of the experimental investigations, and satisfactory compliance was obtained. © 2012 Elsevier Ltd. All rights reserved.

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