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检索条件"机构=Faculty of Robotics Science and Technology"

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Application of vibrothermography in nondestructive testing of structures

Application of vibrothermography in nondestructive testing o...

引用

6th European Workshop on Structural Health Monitoring 2012, EWSHM 2012

作者： Szwedo, M. Pieczonka, L. Uhl, T. Department of Robotics and Mechatronics Faculty of Mechanical Engineering and Robotics AGH University of Science and Technology Al. A. Mickiewicza 30 30-059 Krakow Poland

ISBN: (纸本)9783940283412

Vibrothermography is a nondestructive testing method that monitors heat produced by damage under vibration and/or ultrasonic excitation in order to evaluate the structural health. The paper investigates practical aspects of vibrothermographic testing of structures. Measurements in two typical application areas of vibrothermography are presented and discussed. The examples are weld test specimens and a military aircraft fuselage skin. Measurements have been performed with use of an in-house vibrothermographic testing system. In case of welded specimens a series of carbon steel test samples with different flaw types have been investigated. In case of aircraft testing, field measurements have been performed on a wing and fuselage sections in order to assess the structural integrity. The paper discusses practical aspects related to field measurements with use of vibrothermography and presents thermal image processing techniques which allow to obtain the best flaw detection results. Applied image processing techniques allow increasing the quality and readability of the results coming from field measurements with low thermal response from the structure. The paper is concluded with a discussion on applications of vibrothermographic testing in Structural Health Monitoring applications.

关键词： Nondestructive examination

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An impact of chosen construction parameter and operating conditions on the quality of wind turbine energy generation

An impact of chosen construction parameter and operating con...

引用

2012 13th International Carpathian Control Conference, ICCC 2012

作者： Pytel, Krzysztof Jaracz, Kazimierz Gumula, Stanislaw Institute of Technology Pedagogical University of Cracow Cracow Poland Faculty of Mechanical Engineering and Robotics AGH University of Science and Technology Cracow Poland

ISBN: (纸本)9781457718687

Wind turbines significantly affect the quality of energy in the grid. There are a number of factors, which cause fluctuations in the energy produced by wind turbines. The paper presents results of research on the model wind turbine to assess the impact of ground-layer shape, transient effects of air movement, the distance between wind turbines and parameters resulting in the construction on the efficiency of utilization of wind energy. © 2012 IEEE.

关键词： Wind turbines

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Multi-robot exploration with communication requirement to a moving base station

Multi-robot exploration with communication requirement to a ...

引用

2012 IEEE International Conference on Automation science and Engineering: Green Automation Toward a Sustainable Society, CASE 2012

作者： Pandey, Romit Singh, Arun Kumar Krishna, K. Madhava Department of Robotics Research International Institute of Information Technology Hyderabad India Faculty of Computer Science International Institute of Information Technology Hyderabad India

ISBN: (纸本)9781467304283

Exploration is a core and important robotics area, whose applications include search and rescue robotics, planetary exploration etc. We know that this exploration task is best performed when using a multi-robot system. In this paper, we present an algorithm for multi-robot exploration of an unknown environment, taking into account the communication constraints between the robots. The aim of the robots is to explore the whole map as a pack, without losing communication throughout. The key task for us here is to allocate the target points for multiple robots so as to maximize the area explored and minimize the time and plan paths for the robots in such a way so as to avoid obstacles. A multi-robot exploration methodology is introduced similar to depth first strategy, that samples frontier points based on a metric function. This function aims to maximize the visibility gain or information gain while minimizing the distance to be travelled to the frontier points, such that the robots are within the limited communication distance of each other. The algorithm has been tested through simulation runs of various maps and results and evaluations have been presented based on it. The results effectively demonstrate that our algorithm allows robot pack to quickly accomplish the task of exploration and without the constraint ever breaking down. Here, we also present a comparative analysis of our algorithm with another exploration approach, which finds new areas based on population generation and utility calculation over the population. The results show tangible performance gain of this method over previous methods reported on exploration with limited communication constraints. © 2012 IEEE.

关键词： Industrial robots

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Anti-wear properties of amorphous a-C:H and a-C:N:H carbon coatings deposited on polycarbonate

Anti-wear properties of amorphous a-C:H and a-C:N:H carbon c...

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作者： Slawomir, Zimowski Rakowski, Wieslaw Andrzej Jonas, Stanislawa AGH University of Science and Technology Faculty of Mechanical Engineering and Robotics Al. Mickiewicza 30 Krakow 30-059 Poland AGH University of Science and Technology Faculty of Materials Science and Ceramics Al. Mickiewicza 30 Krakow 30-059 Poland

In this study, we investigate the tribological properties of amorphous hydrogenated (a-C:H) and nitrogenated (a-C:N:H) carbon coatings deposited on polycarbonate substrates (PC). The a-C:H and a-C:N:H coatings of 700-nm thickness were deposited by radio frequency chemical vapour deposition method (13.56 MHz, 300 W). The chemical composition of the coatings was determined by X-ray photoelectron spectroscopy and their structure with the use of Fourier transform infrared spectroscopy spectroscopy. A surface roughness was measured by contact method. It was found that the nitrogenated a-C:N:H coatings have much lower surface roughness in comparison with hydrogenated a-C:H one. All examined coatings showed very good adhesion to PC substrate in the scratch test. Tribological properties were investigated with the use of ball-on-disc tribometer in the contact with 100Cr6 steel ball. The pure PC exhibited higher coefficient of friction (0.38) as compared to those with the coatings. The lowest value of friction coefficient (around 0.17) was found for a-C:H coating. The wear resistance of the amorphous carbon/substrate system is about 10 times higher than that of PC substrate. Copyright © 2012 John Wiley & Sons, Ltd. Copyright © 2012 John Wiley & Sons, Ltd.

关键词： Adhesion

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The application of an intelligent crane control system

The application of an intelligent crane control system

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13th IFAC Symposium on Control in Transportation Systems, CTS 2012

作者： Smoczek, J. Szpytko, J. Hyla, P. AGH University of Science and Technology Faculty of Mechanical Engineering and Robotics Av. A. Mickiewicza 30 PL 30-059 Krakow Poland

ISBN: (纸本)9783902823137

The paper describes the crane control application and method of designing the anti-sway crane control system based on the fuzzy logic and pole placement method. The crane control system consists of the machine vision system used to contactless measure the sway of a payload, and the untypical stereovision system based on a single camera used to capture the stereo pair of crane workspace snapshots. The method of crane workspace identification based on the stereovision system, and safe and time-optimal path planning for a payload utilizing the heuristic graph search algorithm is delivered in the paper, together with the hardware and software description of the control application. © 2012 IFAC.

关键词： Fuzzy logic

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Supervisory system for supporting decision-making process in proactive maintenance of technical object

Supervisory system for supporting decision-making process in...

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2nd IFAC Workshop on Advanced Maintenance Engineering, Services and technology, A-MEST 2012

作者： Smoczek, J. Szpytko, J. AGH University of Science and Technology Faculty of Mechanical Engineering and Robotics Av. A. Mickiewicza 30 PL 30-059 Krakow Poland

ISBN: (纸本)9783902823175

The proactive maintenance involves the advances warming of the failure possibility, that can bring the attention of maintenance personnel to impending danger, and realizing preventive and corrective operations. The paper describes the application type of HMI/SCADA equipped with tools created using soft computing techniques applied to design the fuzzy predictive models of time between failures, and to aid decision-making process of user by collected in database heuristic maintenance strategy. The method of off-line and on-line learning predictive models was based on the genetic algorithm and recursive least squares algorithm. The application of supervisory system was tested on the laboratory stand equipped with the physical model of an overhead travelling crane. © 2012 IFAC.

关键词： Fuzzy logic

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Modal analysis in diagnostics of rotating machinery

Modal analysis in diagnostics of rotating machinery

引用

9th International Conference on Condition Monitoring and Machinery Failure Prevention Technologies 2012, CM 2012 and MFPT 2012

作者： Bednarz, Jaroslaw Barszcz, Tomasz Department of Robotics and Mechatronics Faculty of Mechanical Engineering AGH University of Science and Technology al. Mickiewicza 30 30-059 Krakow Poland

ISBN: (纸本)9781622764334

In the last few years, for the purposes of identification of mechanical systems during their normal work the OMA (Operational Modal Analysis) methods are frequently used. These methods can be applied under the assumption that the excitation acting on the tested system is random. This requirement is not met in case of some industrial machines (e.g. in power engineering) while the excitation related to rotating elements significantly worsen the accuracy of modal models estimated by means of the OMA methods. Therefore the methods making it possible to overcome this problem arise great interest. One of such methods is OMAX that nowadays is more and more frequently applied to operational identification of mechanical structures. The paper concerns comparison of the classical methods (OMA) and OMAX method. The results were verified experimentally for the characteristics measured on the laboratory object and on the wind turbine.

关键词： Modal analysis

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System for determination of hazardous areas for blind people using wave-vibration markers - Final conclusions

System for determination of hazardous areas for blind people...

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41st International Congress and Exposition on Noise Control Engineering 2012, INTER-NOISE 2012

作者： Wiciak, Jerzy W. AGH - University of Science and Technology Faculty of Mechanical Engineering and Robotics Department of Mechanics and Vibroacoustics Al. Mickiewicza 30 30-059 Kraków Poland

ISBN: (纸本)9781627485609

The paper is devoted to the final stage of the works realized under the research project entitled: "The development of the method for marking and identification of the spots dangerous and of special importance for vision impaired persons in the big city with use of the wave-vibration markers". The article presents the optimal solution regarding the installation of the system on the selected objects of the urban engineering. The concept of the shape of the zone that is used for marking of the dangerous spot is also discussed. Finally a review of influence of environmental sounds on orientation and mobility of blind and visual impaired people, results of vibration perception threshold measurement taken at the wrist of both hands, and some possible application of paraseismic vibrations in the spatial orientation of blind and partially-sighted people are presented.

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A further study on short term memory improvement by neurofeedback

A further study on short term memory improvement by neurofee...

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2012 International Conference on Biomedical Engineering and Biotechnology, iCBEB 2012

作者： Nan, Wenya Rodrigues, Joao Pedro Wan, Feng Mak, Peng Un Mak, Pui In Vai, Mang I. Rosa, Agostinho Department of Electrical and Computer Engineering Faculty of Science and Technology University of Macau China LaSEEB-System and Robotics Institute Instituto Superior Tecnico Technical University of Lisbon Portugal

ISBN: (纸本)9780769547060

Our previous study successfully improved short term memory by individual alpha neurofeedback training. However, short term memory and its improvement in different languages are still not clear. Therefore, the purpose of this paper was to evaluate the memory performance in alphabetic and ideographic language groups. Besides, the relationship between initial memory and its improvement was investigated. The results indicated short term memory in ideographic language was higher than those in alphabetic language and forward digit span improvement was positive related to its initial performance. © 2012 IEEE.

关键词： Brain

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Microstructure, mechanical and tribological properties of the nc-Cr xCy/a-C and nc-CrxCy/a-C:H nanocomposite coatings on oxygen-hardened Ti-6Al-4V alloy

Microstructure, mechanical and tribological properties of th...

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作者： Zimowski, Slawomir Moskalewicz, Tomasz Kot, Marcin Wendler, Bogdan Czyrska-Filemonowicz, Aleksandra AGH University of Science and Technology Faculty of Mechanical Engineering and Robotics Al. Mickiewicza 30 Krakow 30-059 Poland AGH University of Science and Technology Faculty of Metals Engineering and Industrial Computer Science Al. Mickiewicza 30 Krakow 30-059 Poland Lodz University of Technology Faculty of Mechanical Engineering ul. Stefanowskiego 1 90 -924 Lódź Poland

The nanocomposite coatings, nc-CrxCy/a-C and nc-CrxCy/a-C:H, consisting of chromium carbide nanocrystals embedded in an amorphous hydrogen free carbon (a-C) matrix or in an amorphous hydrogenated carbon (a-C:H) matrix deposited on oxygen-hardened Ti-6Al-4V alloy by magnetron sputtering were investigated. Oxygen hardening of titanium alloy was performed by oxidation under plasma glow discharge. For both coatings, the phase identification by high-resolution transmission electron microscopy revealed the presence of Cr7C3 and Cr 23C6 nanocrystals of size 2Ã·13 nm embedded in an amorphous carbon a-C and a-C:H matrix. The microhardness values were found to be 9.7 GPa and 12.1 GPa for the nc-CrxCy/a-C and nc-CrxCy/a-C:H coatings, respectively, and 10.6 GPa for oxygen-hardened titanium alloy. Scratch tests indicated good coating-substrate adhesion for both coatings. It was found that the hydrogenated nc-Cr xCy/a-C:H coating exhibited lower coefficient of friction ranging from 0.1 to 0.15 (while sliding 1-mm diameter alumina ball) as compared to friction coefficient of nc-CrxCy/a-C coating which showed higher value, up to 0.2. The coated alloy features much better wear resistance than oxygen-hardened one. Copyright © 2012 John Wiley & Sons, Ltd. Copyright © 2012 John Wiley & Sons, Ltd.

关键词： Wear resistance

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