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    Wyświetlanie 1-15 z 15
    Tytuł:
    Research on optimization of unrelated parallel machine scheduling based on IG-TS algorithm
    Autorzy:
    Chi, Xinfu
    Liu, Shijing
    Li, Ce
    Powiązania:
    https://bibliotekanauki.pl/articles/2173693.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    warp knitting machine
    parallel machine scheduling
    iterative greedy algorithm
    tabu search
    osnowarka
    planowanie maszyn równoległych
    algorytm zachłanny iteracyjny
    przeszukiwanie tabu
    Opis:
    This issue is a typical NP-hard problem for an unrelated parallel machine scheduling problem with makespan minimization as the goal and no sequence-related preparation time. Based on the idea of tabu search (TS), this paper improves the iterative greedy algorithm (IG) and proposes an IG-TS algorithm with deconstruction, reconstruction, and neighborhood search operations as the main optimization process. This algorithm has the characteristics of the strong capability of global search and fast speed of convergence. The warp knitting workshop scheduling problem in the textile industry, which has the complex characteristics of a large scale, nonlinearity, uncertainty, and strong coupling, is a typical unrelated parallel machine scheduling problem. The IG-TS algorithm is applied to solve it, and three commonly used scheduling algorithms are set as a comparison, namely the GA-TS algorithm, ABC-TS algorithm, and PSO-TS algorithm. The outcome shows that the scheduling results of the IG-TS algorithm have the shortest manufacturing time and good robustness. In addition, the production comparison between the IG-TS algorithm scheduling scheme and the artificial experience scheduling scheme for the small-scale example problem shows that the IG-TS algorithm scheduling is slightly superior to the artificial experience scheduling in both planning and actual production. Experiments show that the IG-TS algorithm is feasible in warp knitting workshop scheduling problems, effectively realizing the reduction of energy and the increase in efficiency of a digital workshop in the textile industry.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2022, 70, 4; art. no. e141724
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spatial compliance measurement of a clamping table with integrated force sensors
    Autorzy:
    Friedrich, Christian
    Ihlenfeldt, Steffen
    Powiązania:
    https://bibliotekanauki.pl/articles/2052192.pdf
    Data publikacji:
    2022
    Wydawca:
    Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
    Tematy:
    machine tool
    parallel kinematics
    force measurement
    sensor integration
    Opis:
    Force sensor integration into machine components is a promising approach to measure spatial process forces, especially, when regarding hexapod structures and kinematics. Rigid still-standing hexapod frameworks, such as clamping tables, are particular suitable for this approach, as no dynamic influences need to be taken into account within the measurement model and they allow a measurement in 6 degrees of freedom. On the other hand, the stiffness of rigid frameworks is reduced by force sensor integration significantly. In addition, many approaches apply joints or flexure hinges to reduced lateral forces and improve the measuring quality, which reduce the stiffness even more. In this contribution, the compliance of a clamping table with integrated force sensors and flexure hinges is determined by experimental measurements using a multiline laser interferometer, by analytic calculation, and by finite element simulation. In conclusion, the amount of stiffness reduction by force sensors and flexure hinges is quantified and different methods for compliance determination are compared.
    Źródło:
    Journal of Machine Engineering; 2022, 22, 1; 70-83
    1895-7595
    2391-8071
    Pojawia się w:
    Journal of Machine Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Unrelated Parallel Machines Scheduling Problem with Machine and Job Dependent Setup Times, Availability Constraints, Time Windows and Maintenance Times
    Autorzy:
    Agárdi, Anita
    Nehéz, Károly
    Powiązania:
    https://bibliotekanauki.pl/articles/2023961.pdf
    Data publikacji:
    2021-09
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    production scheduling
    parallel machine
    setup time
    time windows
    genetic algorithm
    Opis:
    Unrelated Parallel Machines Scheduling Problem (U-PMSP) is a category of discrete optimization problems in which various manufacturing jobs are assigned to identical parallel machines at particular times. In this paper, a specific production scheduling task the U-PMSP with Machine and Job Dependent Setup Times, Availability Constraint, Time Windows and Maintenance Times is introduced. Machines with different capacity limits and maintenance times are available to perform the tasks. After that our problem, the U-PMSP with Machine and Job Dependent Setup Times, Availability Constraints, Time Windows and Maintenance Times is detailed. After that, the applied optimization algorithm and their operators are introduced. The proposed algorithm is the genetic algorithm (GA), and proposed operators are the order crossover, partially matched crossover, cycle crossover and the 2-opt as a mutation operator. Then we prove the efficiency of our algorithm with test results. We also prove the efficiency of the algorithm on our own data set and benchmark data set. The authors conclude that this GA is effective for solving high complexity parallel machine problems.
    Źródło:
    Management and Production Engineering Review; 2021, 13, 3; 15-24
    2080-8208
    2082-1344
    Pojawia się w:
    Management and Production Engineering Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Blocks for two-machines total weighted tardiness flow shop scheduling problem
    Autorzy:
    Bożejko, W.
    Uchroński, M.
    Wodecki, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/202179.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    flow shop
    two machine
    due date
    minimal costs
    blocks of tasks
    parallel algorithm
    Opis:
    The paper discusses a two-machine flow shop problem with minimization of the sum of tardiness costs, being a a generalization of the popular NP-hard single-machine problem with this criterion. We propose the introduction of new elimination block properties allowing for accelerating the operation of approximate algorithms of local searches, solving this problem and improving the quality of solutions determined by them.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2020, 68, 1; 31-41
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stiffness evaluation of a hexapod machine tool with integrated force sensors
    Autorzy:
    Friedrich, Christian
    Kauschinger, Bernd
    Ihlenfeldt, Steffen
    Powiązania:
    https://bibliotekanauki.pl/articles/99529.pdf
    Data publikacji:
    2020
    Wydawca:
    Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
    Tematy:
    machine tools
    parallel kinematics
    force measurement
    sensors integration
    Opis:
    Today, in-process force measurement is required by many manufacturing applications, such as process monitoring, quality assurance, or adaptive process control. A very promising force measurement approach bases on sensor-integration into the machine structure and is particularly suitable for hexapod structures and kinematics, where it allows a measurement in 6 degrees of freedom. On the other hand, a sensor integration also affects the machine. Especially for strain-gauge-based force sensors, a stiffness reduction is predicted, as their measuring principle requires a deformation. The practical consequences of these influences are investigated in this contribution. In particular, this work presents extensive experimental studies of the stiffness change caused by sensor integration for a single hexapod strut as well as for the complete hexapod machine tool. The results are evaluated in comparison to compliances of other components, such as the kinematic joints, and to stiffness changes resulting from sensor-integration into the end-effector or the application of a commercial force/torque sensor at the end-effector. In conclusion, the studies support the approach of structure-integrated force measurement for parallel kinematics, as the stiffness loss is rather small in many cases.
    Źródło:
    Journal of Machine Engineering; 2020, 20, 1; 58-69
    1895-7595
    2391-8071
    Pojawia się w:
    Journal of Machine Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Decision of the direct position problem of the joint relative manipulation mechanism with five degrees of freedom
    Autorzy:
    Pashchenko, V. N.
    Meleshchenko, D. I.
    Rashoyan, G. V.
    Malyshev, D. I.
    Kuzmina, V. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/266251.pdf
    Data publikacji:
    2018
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    kinematyka
    niezawodność maszyn
    manipulator równoległy
    kinematics
    machine reliability
    parallel manipulator
    Opis:
    One of the mechanisms of joint relative manipulation with five degrees of freedom is considered. An approach to solving the direct positional problem is described. A simplified 3D model was created to verify the correctness of the solution. The results of a comparison of calculated and experimental data are presented.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2018, 23, 4; 1025-1033
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimization of Machine Learning Process Using Parallel Computing
    Autorzy:
    Grzeszczyk, Michał K.
    Powiązania:
    https://bibliotekanauki.pl/articles/102525.pdf
    Data publikacji:
    2018
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    parallel computing
    machine learning
    perceptron
    neural networks
    OpenMP
    Opis:
    The aim of this paper is to discuss the use of parallel computing in the supervised machine learning processes in order to reduce the computation time. This way of computing has gained popularity because sequential computing is often insufficient for large scale problems like complex simulations or real time tasks. After presenting the foundations of machine learning and neural network algorithms as well as three types of parallel models, the author briefly characterized the development of the experiments carried out and the results obtained. The experiments on image recognition, ran on five sets of empirical data, prove a significant reduction in calculation time compared to classical algorithms. At the end, possible directions of further research concerning parallel optimization of calculation time in the supervised perceptron learning processes were shortly outlined.
    Źródło:
    Advances in Science and Technology. Research Journal; 2018, 12, 4; 81-87
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of properties of induction machine with combined parallel star-delta stator winding
    Analiza właściwości maszyny indukcyjnej z uzwojeniem stojana połączonym gwiazda-trójkąt
    Autorzy:
    Schreier, L.
    Bendl, J.
    Chomat, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1199581.pdf
    Data publikacji:
    2017
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Napędów i Maszyn Elektrycznych Komel
    Tematy:
    induction machine
    parallel combined stator winding
    maszyna indukcyjna
    równolegle polączone uzwojenie stojana
    Opis:
    W artykule przeanalizowano właściwości maszyny z równoległym połączeniem uzwojenia stojana. Analizę prowadzono w zakresie liczby przewodów delta i połączonego w gwiazdę uzwojenia. Przedstawiono wpływ stosunku liczby przewodów tych uzwojeń do możliwości stłumienia wyższych harmonicznych przestrzennych i dotyczących sprawności urządzenia. Pochodne równania maszyny z połączonym uzwojeniem stojana opisują zachowanie maszyny, zarówno w stanie ustalonym, nieustalonym oraz podczas awarii.
    Źródło:
    Maszyny Elektryczne: zeszyty problemowe; 2017, 1, 113; 147-153
    0239-3646
    2084-5618
    Pojawia się w:
    Maszyny Elektryczne: zeszyty problemowe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Flexible coupling of drive and guide elements for parallel-driven feed axes to increase dynamics and accuracy of motion
    Autorzy:
    Peukert, C.
    Merx, M.
    Müller, J.
    Ihlenfeldt, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/99992.pdf
    Data publikacji:
    2017
    Wydawca:
    Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
    Tematy:
    compliant mechanism
    parallel-driven feed axis
    machine tool
    control bandwidth
    Opis:
    Productivity enhancement is achievable by increasing the dynamics of machines. This can be accomplished by decreasing the moving mass or by increasing the driving forces. One possibility for increasing the drive forces lies in the use of multiple parallel-acting actuators. Because of the mechanical coupling between the drives, undesirable interference of the actuators occurs. This limits the control bandwidth of the feed axis. Feed axes of machine tools are mostly equipped with linear guides fitted with rolling elements. Since they dispose of just one degree of freedom, small errors in their alignment or thermally induced errors cause constraining loads. In this paper compliant mechanisms are used to mechanically decouple the slide from the guide and drive elements. The application of flexible joints in gantry axes with linear motors and ball screws is investigated. The dynamic behaviour of the feed axis components are modelled using the Finite Element Method. By applying the modal reduction technique, the dynamic behaviour is included in an elastic multibody simulation. With the mechanical decoupling of the drive and guide elements it is possible to increase the control bandwidth of the system. Deviations in motion may also be corrected with parallel-driven feed axis by applying compliant mechanisms.
    Źródło:
    Journal of Machine Engineering; 2017, 17, 2; 77-89
    1895-7595
    2391-8071
    Pojawia się w:
    Journal of Machine Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The development of mechatronic active control system of tool spatial position in parallel kinematics machine tool
    Autorzy:
    Strutinsky, V. B.
    Demyanenko, A. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/949316.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    parallel kinematics machine tool
    accuracy
    mechatronics
    calibration
    Opis:
    The method and the mechatronic system of active control of the dynamic spatial positioning of the executive body of a parallel kinematics machine tool are proposed. By means of geometric modeling, the basic analytical relations that characterize the interconnection between the rods of the mechatronic control system and the power rods of the parallel kinematics machine tool are calculated. The analytical dependencies that characterize errors of the spatial position of the executive body of the parallel kinematics machine tool are set out. The prototype of the mechatronic system of active control of the dynamic spatial position of the executive body of the parallel kinematics machine tool has been manufactured and its presetting and viability checking made. The special equipment to control the exact position of the tool of the parallel kinematics machine tool when it comes to the position is proposed.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2016, 54, 3; 757-768
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Java profiler based on byte code analysis and instrumentation for many-core hardware accelerators
    Autorzy:
    Pietroń, M.
    Karwatowski, M.
    Wiatr, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/114614.pdf
    Data publikacji:
    2015
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    virtual machine
    CUDA
    GPU
    profiling
    parallel computing
    Opis:
    One of the most challenging issues in the case of many and multi-core architectures is how to exploit their potential computing power in legacy systems without a deep knowledge of their architecture. The analysis of static dependence and dynamic data dependences of a program run, can help to identify independent paths that could have been computed by individual parallel threads. The statistics of reusing the data and its size is also crucial in adapting the application in GPU many-core hardware architecture because of specific memory hierarchies. The proposed profiling system accomplishes static data analysis and computes dynamic dependencies for Java programs as well as recommends parts of source code with the highest potential for parallelization in GPU. Such an analysis can also provide starting point for automatic parallelization.
    Źródło:
    Measurement Automation Monitoring; 2015, 61, 7; 385-387
    2450-2855
    Pojawia się w:
    Measurement Automation Monitoring
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Maszyna do równoległej obróbki szprotów
    High-capacity sprat processing machine
    Autorzy:
    Dowgiałło, A.
    Dutkiewicz, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/228393.pdf
    Data publikacji:
    2009
    Wydawca:
    Wyższa Szkoła Menedżerska w Warszawie
    Tematy:
    równoległa obróbka szprotów
    prototyp maszyny do obróbki szprotów
    sprat processing operations
    machine for parallel sprat processing
    Opis:
    W artykule przedstawiono zakres i wyniki badań modelowych poszczególnych operacji obróbczych szprotów (transport, sortowanie, odgławianie i patroszenie) do postaci odgłowionej i wypatroszonej. Na podstawie badań sformułowano założenia, w wyniku których zaprojektowano i wykonano polski prototyp do równoległej obróbki szprotów.
    The paper presents range and results of model experiments of sprat processing operations like transportation, grading, deheading and gutting. On the basis of these results the machine for parallel sprat processing was designed and produced.
    Źródło:
    Postępy Techniki Przetwórstwa Spożywczego; 2009, 2; 57-60
    0867-793X
    2719-3691
    Pojawia się w:
    Postępy Techniki Przetwórstwa Spożywczego
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Machining performance optimization of Parallel Kinematic Machines tools with regard to their anisotropic behaviour
    Autorzy:
    Pateloup, S.
    Bonnemains, T.
    Chanal, H.
    Bouzgarrou, B. C.
    Duc, E.
    Ray, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1429122.pdf
    Data publikacji:
    2008
    Wydawca:
    Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
    Tematy:
    parallel kinematic machine too
    kinematic model
    static model
    tool path optimization
    Opis:
    Today, Parallel Kinematic Machines tools (PKMs) appear in automotive and aeronautic industries. These machines allow a benefit of productivity due to their higher kinematics performances than Serial Kinematic Machines tools (SKMs). However, their machining accuracy is lower. Moreover, the compensation of the defects which penalizes the machined parts quality is difficult due to their anisotropic behaviour. Thus, this article deals with the development of methods improving the machined parts quality and the productivity. In order to improve parts quality, the static behaviour of the machine structure is considered with a model taking into account joints and legs compliances. Then, it allows determining a static workspace. About the productivity, the improvement of kinematics performances is performed through an optimization work of the non productive tool path between cutting operations. The computed tool path must verify a minimum time constraint and avoid collisions between the tool and the machined part. All the methods are illustrated with the PKM Tripteor X7 developed by PCI.
    Źródło:
    Journal of Machine Engineering; 2008, 8, 4; 13-24
    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
      Wyświetlanie 1-15 z 15

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