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    Wyświetlanie 1-16 z 16
    Tytuł:
    Condition-Based Preventive Maintenance of Machine Tools
    Autorzy:
    Neugebauer, R.
    Fischer, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/971213.pdf
    Data publikacji:
    2009
    Wydawca:
    Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
    Tematy:
    condition monitoring at machine tools
    diagnostic parameters
    main spindle
    axis drives
    hydraulic components
    pneumatic components
    Opis:
    Machine tools are expected to be highly available. Unintended failure incurs high costs for repairs and through production losses. Maintenance is a major cost factor and is still mostly reactive today, as a result of failures. Maintenance plans by manufacturers that require preventive maintenance based on running hours are often not implemented consistently. It would be ideal to perform condition-dependent preventive maintenance of the most critical and cost-intensive assemblies of a machine tool. This would make it possible to move repair times into non-productive periods and to procure any spare parts at the right time. Eventually, this would lead to cost savings. This article describes the design of a condition monitoring system for machine tools and shows ways of monitoring the most critical machine tool assemblies.
    Źródło:
    Journal of Machine Engineering; 2009, 9, 3; 64-76
    1895-7595
    2391-8071
    Pojawia się w:
    Journal of Machine Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Potential of Manipulating the Damping Properties of Parallel Kinematic Machine Tools
    Autorzy:
    Wabner, M.
    Grzejszczyk, S.
    Neugebauer, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/971111.pdf
    Data publikacji:
    2008
    Wydawca:
    Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
    Tematy:
    machine tool
    parallel kinematics
    simulation
    active damping
    Opis:
    Parallel kinematics with a higher end-effector degree of freedom such as hexapods and pentapods consist of a large number of joints and slender struts. However, it is only possible to create comparably low levelsof bearing and strut bending stiffness atreasonable expense due to the limited construction space. That means that these structures are very susceptible to vibration. Even in the low-frequency range they have a large number of relevant eigenmodes that are only dampened slightly. Simultaneously, it is difficult to analyze vibrational properties due to coupled eigenmodes, which also makes it difficult to discover ways to remedy this situation. This article will take the example of a pentapod to analyze the dynamic properties of slightly dampened parallel kinematics by simulation to study potential means of manipulating it. This will include a description of the model formation of the mechanical system. The article will also address ways of reducing model size and using various simulation environments to boost analysis efficiency. Finally, both passive and active strategies will be studied and evaluated for boosting damping. Amongst others it could be shown that it is not necessary to damp every of the five kinematic chains to achieve effective improvement of the system damping behaviour.
    Źródło:
    Journal of Machine Engineering; 2008, 8, 1; 63-76
    1895-7595
    2391-8071
    Pojawia się w:
    Journal of Machine Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Processing With Parallel Kinematics - an Experimental Analysis
    Autorzy:
    Neugebauer, R.
    Wabner, M.
    Ihlenfeldt, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/971120.pdf
    Data publikacji:
    2008
    Wydawca:
    Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
    Tematy:
    machine tool
    parallel kinematics
    machining
    milling
    Opis:
    This article summarizes experimental analyses for the determination of process parameters that can be achieved in an industrial machine tool with parallel kinematics. Focus is on the examination of the machining results' dependency on position and direction. Therefore milling experiments are conducted, testing different positions and directions within the workspace. Surface quality, process forces, acceleration as well as vibration characteristics of the working platform are assessed. Based on measured frequency responses the stability limits are determined at different locations within the workspace. By these examinations it can be confirmed that the dependency of static and dynamic machine properties on position and direction has an influence on machining results. Best results are achieved in central positions of the machine used for most of respective operations. Furthermore it's represented that the machining results are comparable to conventional serial machines though parallel kinematics show a stronger dependency on direction.
    Źródło:
    Journal of Machine Engineering; 2008, 8, 1; 54-62
    1895-7595
    2391-8071
    Pojawia się w:
    Journal of Machine Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Control of a servo-pneumatic experimental RIG
    Sterowanie serwo-pneumatyczne w urządzeniu eksperymentalnym
    Autorzy:
    Neugebauer, R.
    Quellmalz, J.
    Schönherr, R.
    Schlegel, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/140190.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    serwo pneumatyka
    sterowanie siłą
    urządzenia kontrolujące pracę serwonapędów
    servo pneumatics
    force control
    motion control
    Opis:
    The paper presents the control concept for an experimental rig with closed-loop controlled pneumatic axis. The objective is the convenient execution of diverse control technologic experiments using free implementable control structures. Since two actuators can be mechanically linked to one another, one is force controlled to generate defined disturbances. Furthermore, a particular simulation model, which can be integrated in the controllers' user program, is pointed out including non-linear effects. Finally, selected experiments are discussed.
    W artykule przedstawiono koncepcję sterowania w urządzeniu eksperymentalnym z osią sterowaną pneumatycznie w zamkniętej pętli. Celem była dogodna realizacja eksperymentów technicznych, w których swobodnie implementowano różne struktury sterowania. Ponieważ dwa siłowniki mogą być mechanicznie powiązane ze sobą, jeden z nich jest sterowany siłą w celu generowania zakłóceń. Ponadto, wskazano szczególny model symulacyjny uwzględniający efekty nieliniowe, który może być zintegrowany z programem sterownika tworzonym przez użytkownika. W części końcowej przedyskutowano wyniki wybranych eksperymentów.
    Źródło:
    Archive of Mechanical Engineering; 2011, LVIII, 2; 195-207
    0004-0738
    Pojawia się w:
    Archive of Mechanical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Non-invasive parameter identification by using the least squares method
    Nieinwazyjna identyfikacja parametrów przy wykorzystaniu metody najmniejszych kwadratów
    Autorzy:
    Neugebauer, R.
    Hellmich, A.
    Hofmann, S.
    Schlegel, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/140192.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    identyfikacja parametrów
    metoda najmniejszych kwadratów
    urządzenia kontrolujące pracę serwonapędów
    parameters identification
    least squares method
    motion control
    Opis:
    The paper presents an adapted least squares identification method for reduced-order parametric models. On the example of the open velocity loop, different model approaches were implemented in a motion control system. Furthermore, it is demonstrated how the accuracy of the method can be improved. Finally, experimental results are shown.
    W artykule przedstawiono metodę identyfikacji, wykorzystującą metodę najmniejszych kwadratów, przystosowaną do modeli parametrycznych ograniczonego rzędu. Na przykładzie otwartej pętli regulacji prędkości zilustrowano różne podejścia do modelowania systemów sterowania. Zademonstrowano ponadto, jak można poprawić dokładność metody. W końcowej części pracy przedstawiono wyniki doświadczalne.
    Źródło:
    Archive of Mechanical Engineering; 2011, LVIII, 2; 185-194
    0004-0738
    Pojawia się w:
    Archive of Mechanical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Time-based method for the combined identification of velocity-loop parameters
    Metoda złożonej identyfikacji parametrów pętli sterowania prędkością wykorzystującą właściwości czasowe
    Autorzy:
    Neugebauer, R.
    Hofmann, S.
    Hellmich, A.
    Schlegel, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/140194.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    identyfikacja parametrów
    model parametryczny
    urządzenia kontrolujące pracę serwonapędów
    parameters identification
    parametric model
    motion control
    Opis:
    Today, a cascaded system of position loop, velocity loop and current loop is standard in industrial motion controllers. The exact knowledge of significant parameters in the loops is the basis for the tuning of the servo controllers. A new method to support the commissioning has been developed. It enables the user to identify the moment of inertia as well as the time constant of the closed current loop simultaneously. The method is based on the auto relay feedback experiment by Aström and Hägglund. The model parameters are automatically adjusted according to the time behaviour of the controlled system. For this purpose, the auto relay feedback experiment is combined with the technique of gradual pole compensation. In comparison to other existing methods, this approach has the advantage that a parametric model for the open velocity loop is derived directly.
    We współczesnych przemysłowych układach sterowania ruchem standardowo wykorzystuje się kaskadowe systemy z pętlą sterowania położeniem, prędkością i pętlą prądową. Dokładna znajomość istotnych parametrów pętli jest podstawą dla optymalizacji działania serworegulatorów. Autorzy opracowali nową metodę wspomagającą pozyskiwanie tych danych. Umożliwia ona jednoczesną identyfikację momentu bezwładności i stałej czasu w zamkniętej pętli prądowej. Metoda jest oparta na eksperymencie Aströma i Hägglunda z automatycznym przekaźnikowym sprzężeniem zwrotnym. Parametry modelu są dobierane automatycznie, biorąc pod uwagę właściwości sterowanego systemu w dziedzinie czasu. Wykorzystano w tym celu eksperyment z automatycznym przekaźnikowym sprzężeniem zwrotnym w połączeniu z techniką stopniowej kompensacji biegunów. W porównaniu do innych istniejących metod, zaletą takiego podejścia jest możliwość bezpośredniego wyznaczenia modelu parametrycznego dla otwartej pętli sterowania prędkością.
    Źródło:
    Archive of Mechanical Engineering; 2011, LVIII, 2; 175-184
    0004-0738
    Pojawia się w:
    Archive of Mechanical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Trajectory planning for kinematically redundant robots using jacobi matrix – an industrial implementation
    Autorzy:
    Walther, M.
    Sewohl, A.
    Schlegel, H.
    Neugebauer, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/99976.pdf
    Data publikacji:
    2017
    Wydawca:
    Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
    Tematy:
    redundant robots
    trajectory planning
    jacobian matrix
    pseudoinverse
    Opis:
    The widespread use of robots in industry contributes significantly to high productivity. Serial 6-axis robots are used in large quantities, e.g. for assembly or welding. A current emerging trend is the use of robots for classic tasks of a machine tool like finishing of milled workpieces. For such applications, standard robots are usually extended by additional axes like linear axes or rotary tilting tables. Therefore, the overall system becomes kinematically redundant. To be able to calculate the axis quantities via inverse kinematics for a given path, additional degrees of freedom must be bound. In order to automatically and optimally consider the additional axis motion a method, using the pseudoinverse of the Jacobian matrix, is discussed. Due to the dependence of the Jacobi matrix on the robot's current joint position, numerical inaccuracies, which in turn reflect a path error, are inherent to this method. By feedback control of the path error, in the form of a classic control loop, the error can be reduced so that a practical implementation on industrial robot controller is possible. In the article possibilities for parameterisation of the algorithm as well as proof of stability of the closed loop are presented. The results obtained are verified by a concrete application.
    Źródło:
    Journal of Machine Engineering; 2017, 17, 3; 24-35
    1895-7595
    2391-8071
    Pojawia się w:
    Journal of Machine Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Simulation based optimization for controller parameterization of machine tool axes – advanced application
    Autorzy:
    Hipp, K.
    Schöberlein, C.
    Schlegel, H.
    Neugebauer, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/99919.pdf
    Data publikacji:
    2017
    Wydawca:
    Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
    Tematy:
    simulation-based optimization
    commissioning
    controller parameterisation
    servo press
    Opis:
    The quality of the controller parameterization of a drive system has direct influence on the obtained performance. Nevertheless, the commissioning is mainly done today by the application of basic tuning rules or not comprehensible automatisms. This often leads to not optimal performance. An alternative approach is to parameterize the typical controller cascade, which is widely used in standard industrial controllers, in one step by using the so-called “simulation-based optimization” (SBO). Significant advantages are the opportunity of defining specific restrictions concerning the desired controller parameterization and the possibility for directly processing non-linear systems without approximations. Furthermore, friction, additional filters in the cascade or controller structure extensions like the Advanced Position Control (APC) can be considered. Therefore, in the present paper, the application and the results of the SBO for different drive systems will be presented. After an introduction, the paper describes the basic principles of the simulation based optimization including the application for controller parameterization. Subsequently, the results for indirect velocity control of a test rig are discussed. After that, the findings for the commissioning of a direct position controller of an industrial servo press are presented. The paper closes with a summary and an outlook.
    Źródło:
    Journal of Machine Engineering; 2017, 17, 1; 57-68
    1895-7595
    2391-8071
    Pojawia się w:
    Journal of Machine Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Non - invasive identification of servo drive parameters
    Autorzy:
    Neugebauer, R.
    Hellmich, A.
    Hofmann, S.
    Schlegel, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/384413.pdf
    Data publikacji:
    2012
    Wydawca:
    Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
    Tematy:
    identification
    parametric model
    natural excitation
    least squares method
    SIMOTION
    Opis:
    For the tuning of servo controllers as well as for monitoring functions, significant parameters of the controlled system are required. In contrast to identification methods with determined input signals, the paper focuses on the problem of identification with regular process movements (non-invasive identification), leading to a lack of power density in some frequency ranges. A nonlinear Least Squares (LS) approach with single mass system and friction characteristic is investigated regarding the accomplishable accuracy and necessary constraints. The proposed method is applicable on industrial motion controllers and has been carried out with a multitude of input sequences. To verify the performance of the approach, achieved experimental results for the model parameters are exposed.
    Źródło:
    Journal of Automation Mobile Robotics and Intelligent Systems; 2012, 6, 2; 13-16
    1897-8649
    2080-2145
    Pojawia się w:
    Journal of Automation Mobile Robotics and Intelligent Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Increased Performance of a Hybrid Optimizer for Simulation Based Controller Parameterization
    Autorzy:
    Neugebauer, R.
    Hipp, K.
    Hellmich, A.
    Schlegel, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/384707.pdf
    Data publikacji:
    2012
    Wydawca:
    Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
    Tematy:
    controller parameterization
    simulation based optimization
    particle swarm optimization (PSO)
    Nelder-Mead
    Opis:
    The controller parameterization is often carried out by applying basic empirical formulas within an integrated automatic design. Hence, the determined settings are often insufficiently verified by the resulting system behavior. In this paper an approach for the controller parameterization by using methods of simulation based optimization is presented. This enables the user to define specific restrictions e.g. the complementary sensitivity function (CSF) to influence the dynamic behavior of the control loop. Furthermore it is possible to choose alternative optimization criteria. A main influence factor for practical offline as well as controller internal optimization methods is the execution time, which can be reduced by applying a hybrid optimization strategy. Thus, the paper presents a performance comparison between the straight global Particle-Swarm-Optimization (PSO) algorithm and the combination of the global PSO with the local optimization algorithm of Nelder-Mead (NM) to a hybrid optimizer (HO) based on examples.
    Źródło:
    Journal of Automation Mobile Robotics and Intelligent Systems; 2012, 6, 1; 42-45
    1897-8649
    2080-2145
    Pojawia się w:
    Journal of Automation Mobile Robotics and Intelligent Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Combination of criteria for controller parameterisation in the time and frequency domain by simulation-based optimisation
    Autorzy:
    Hipp, K.
    Uhrig, M.
    Hellmich, A.
    Schlegel, H.
    Neugebauer, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/99661.pdf
    Data publikacji:
    2016
    Wydawca:
    Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
    Tematy:
    simulation based optimisation
    optimisation criteria
    controller parameterisation
    frequency domain
    time domain
    Opis:
    The position controller cascade is widely used in standard industrial controllers. Its controller parameterisation is commonly performed by either applying basic tuning rules or by carrying out not comprehensible design automatisms.In this paper an alternative approach to parameterise the cascade in one step is presented. It bases on established methods within the field of optimisation research specifically the so-called simulation-based optimisation (SBO), which can also handle non-linear models and various constrains. Own research showed, that criteria in the time domain as well as in the frequency domain are suitable optimisation criteria. However, both types have individual advantages and disadvantages. Therefore, in this research, selected representatives from both types were combined as new multi-objective optimisation criteria and investigated according to their performance. Investigations were performed for a test rig model (third order transfer function plus dead time and friction).The paper presents fundamentals of the SBO and a description of the optimisation criteria, obtained results as well as their verification on the test rig. Also, the derived controller parameterisations are compared to the integrated tuning automatism.
    Źródło:
    Journal of Machine Engineering; 2016, 16, 4; 70-81
    1895-7595
    2391-8071
    Pojawia się w:
    Journal of Machine Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Approach for the Developmentof Energy-Efficient Machine Tools
    Autorzy:
    Neugebauer, R.
    Frieß, U.
    Paetzold, J.
    Wabner, M.
    Richter, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/971148.pdf
    Data publikacji:
    2009
    Wydawca:
    Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
    Tematy:
    energy efficiency
    machine tool
    product development
    Opis:
    The life cycle costs of machine tools are much higher determined by their energy costs than what is often roughly assessed. The growing demand for consumer goods and especially possibilities of individual mobility in major parts of the developing world - e. g. Asia - will lead to serious problems in meeting the demand for an abundant energy supply and will increase the cost for energy further in the near-term future. Harder efforts are necessary to "reach more with less" - using less energy than today to reach a defined goal in production. The paper deals with a methodology to design machine tools with a high "energy efficiency". Based on the property-driven design methodology by Weber a systematic approach is shown to enhance the design of machine tools. Energy efficiency is a new additional and central property in the design process. To attain these given properties characterisations are determined by the engineer to fulfil these properties. On the developing-path the characterisations are defined in more detail step by step, and after each step it is assured if the accounted properties where met by the defined characteristics. The approach is to first analyse existing machine tools and therefore define prior energy consumers. The identified major consumers are afterwards systematically addressed to reduce their energy consumption. The result is an enhanced machine tool with state-of-the-art energy usage. This addresses the objectives of the EU and takes pressure of the energy supply by reducing the energy demand in production.
    Źródło:
    Journal of Machine Engineering; 2009, 9, 2; 51-62
    1895-7595
    2391-8071
    Pojawia się w:
    Journal of Machine Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sustainable increases of energy efficiency by holistically considered structures of factory systems
    Autorzy:
    Richter, C.
    Fischer, S.
    Neugebauer, R.
    Müller, E.
    Schädlich, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/99737.pdf
    Data publikacji:
    2011
    Wydawca:
    Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
    Tematy:
    factory building
    process
    energy interaction
    Opis:
    A number of efficient solutions are already in existence today for reducing specific energy and raw material needs, and they are continuously being improved. Since the competition between individual solutions for sustained energy efficiency may prove to be an obstacle to the system as a whole, the interaction of individual elements and sub-systems in complex domains must be considered in an integrated way with an eye to their reciprocal energy effects. What will be the impact of energy savings resulting from innovative approaches and intelligent solutions at a single systemic level on the system as a whole? Do they serve to reduce overall energy costs? What kinds of energy-related information are necessary to answer these questions? This article examines the issue of how dedicated energy savings in the production sector impact on the total energy requirement in factory systems. In one example, process and building are examined together in order to thereby recognize energy relationships. It was demonstrate that waste heat from machine tools has a significant impact on the factory hall climate and therefore on the heating needs of factory buildings. A model calculation demonstrated that energy savings at individual system levels are transferable to the entire system in direct proportion to the energy efficiency of the building.
    Źródło:
    Journal of Machine Engineering; 2011, 11, No. 1-2; 11-22
    1895-7595
    2391-8071
    Pojawia się w:
    Journal of Machine Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wykorzystanie mikrokontrolera jednoukładowego do sterowania optymalnym ustawieniem płaszczyzny ogniwa fotowoltaicznego w stosunku do słońca
    Using a single-system microcontroller to control optimal positioning of photovoltaic cell plane relative to the sun
    Autorzy:
    Nalepa, K.
    Neugebauer, M.
    Sołowiej, P.
    Chmielewski, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/287109.pdf
    Data publikacji:
    2009
    Wydawca:
    Polskie Towarzystwo Inżynierii Rolniczej
    Tematy:
    sterowanie nadążne
    ogniwo fotowoltaiczne
    mikrokontroler jednoukładowy
    solar tracking
    photovoltaic
    one-chip microcontroller
    Opis:
    W pracy przedstawiono analizę pracy ogniwa fotowoltaicznego w warunkach ustawienia nieruchomego oraz sterowania nadążnego za słońcem. Na podstawie analizy warunków pracy w systemie sterowania opracowany został algorytm sterowania. Porównano zyski energetyczne obu rozwiązań. Zaproponowane zostało rozwiązanie mechaniczno-informatyczne układu realizującego optymalne ustawienie płaszczyzny ogniwa fotowoltaicznego do aktualnej pozycji słońca. W układzie sterowania zastosowano mikrokontroler jednoukładowy ATmega8 firmy Atmel współpracujący z elementami wykonawczymi w postaci elektrycznych siłowników liniowych.
    Analysis of photovoltaic module work under conditions of its immovable setups and follow-up behind sun control is presented in this paper. An algorithm of steering was processed on the basis of the work condition in the control system analysis. Energy benefits of both solutions were compared. Mechanical solution, realizing optimal setup of photovoltaic module surface on the basis of information about the current position of the sun, was built. One-chip ATmega8 microcontroller of the Atmel company mating with executive elements in the form of electric linear servo-motors was applied in the control system.
    Źródło:
    Inżynieria Rolnicza; 2009, R. 13, nr 8, 8; 127-132
    1429-7264
    Pojawia się w:
    Inżynieria Rolnicza
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Bottom Deposits of Stratified, Seepage, Urban Lake (On the Example of Tyrsko Lake, Poland) as a Factor Potentially Shaping Lake Water Quality
    Autorzy:
    Augustyniak, R.
    Neugebauer, M.
    Kowalska, J.
    Szymański, D.
    Wiśniewski, G.
    Filipkowska, Z.
    Grochowska, J.
    Łopata, M.
    Parszuto, K.
    Tandyrak, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/125198.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    urban lake
    phosphorus
    bottom sediment
    internal loading
    Opis:
    The object of the study was Tyrsko Lake (area 18.6 ha, max. depth 30.4 m), located in the western part of Olsztyn (Olsztyn Lakeland). This lake is one of the clear water lakes in Olsztyn, but the progressive deterioration of water quality has been observed during recent years. The phosphorus concentration in the water-sediment interface, phosphorus fractions quantity and the amount of components which can bind this element was investigated in the upper (0–5 cm) layer of deposits. The aim of study was to analyze the potential influence of bottom sediment on the lake water quality. The obtained results revealed that the bottom sediment of Tyrsko Lake can be classified as mixed, silica-organic type, with a relatively high content of iron (over 4% Fe in d.w.). The total phosphorus content was ca. 3.5 mg P g,-1 d.w. on average. Phosphorus in the bottom sediment was bound mainly with organic matter (NaOH-nrP fraction), which had over 50% share in TP. Highly mobile fractions (NH4-Cl-P and BD-P) together only included ca. 5% to 7% TP. The obtained results show that the bottom sediment of Tyrsko Lake can bind phosphorus quite effectively. The calculated internal mineral phosphorus loading during summer stagnation period was 10.9 kg and it was lower that the assessed annual external phosphorus load (22.6 kg). The assessed annual phosphorus loading from both sources was still lower than the critical load according to Vollenweider criteria. However, due to the fact that the internal loading phenomenon is occurring in the lake, it should be taken into consideration that the lake water quality can deteriorate gradually during the longer time perspective. These findings should be accounted for in the future if the potential protection and restoration procedures will be developed.
    Źródło:
    Journal of Ecological Engineering; 2017, 18, 5; 55-62
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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