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    Wyświetlanie 1-9 z 9
    Tytuł:
    Modernizacja stanowiska do wyważania dynamicznego
    Modernization of the dynamic balancing station
    Autorzy:
    Słomion, M.
    Matuszewski, M.
    Krajnik, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/95432.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Bydgoska im. Jana i Jędrzeja Śniadeckich. Wydawnictwo PB
    Tematy:
    wyważarka
    wyważanie dynamiczne
    modernizacja
    balancing machine
    dynamic balancing
    modernization
    Opis:
    Ciągły rozwój przemysłu oraz zwiększanie produkcji wymuszają projektowanie mobilnych, kompaktowych oraz zautomatyzowanych, często wielofunkcyjnych maszyn technologicznych w celu zminimalizowania ilości operacji i kosztów produkcyjnych. Obecnie także w technologii budowy wyważarek dąży się do projektowania kompaktowych urządzeń wyważających, które służyć mają również do korekcji masy niewyważenia za pomocą doposażenia w różnego rodzaju frezerki i wiertarki, służące do ujmowania masy powodującej niewyważenie. Celem badania było zmodyfikowanie stanowiska do wyważania dynamicznego, polegające na zaprojektowaniu układu przesuwnej wiertarki z pionową osią wrzeciona, mocowanej na stalowej ramie, tak aby możliwe było wiercenie wirników o określonym zakresie średnic oraz długości.
    Continuous development of the industry and increasing production enforces the design of mobile, compact and automatem often multifunctional machines, in order to minimize the number of operations and production costs. Currently, also in the technology of the balancers construction, producers seek to design a compact balancing machines, which also serve to correct the unbalance mass by integrating various types of millers and drills subtracting mass that causes the imbalance. The aim of this study is purpose modification the work station for dynamic balancing consisting in designing a sliding system of a drill with a vertical axis of the spindle fixed on a steel frame, to allow the drilling rotors with a defined range of diameters and lengths.
    Źródło:
    Postępy w Inżynierii Mechanicznej; 2017, 10(5); 45-55
    2300-3383
    Pojawia się w:
    Postępy w Inżynierii Mechanicznej
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Impact of target selection on front kick kinematics in taekwondo – pilot study
    Autorzy:
    Wąsik, Jacek
    Góra, Tomasz
    Powiązania:
    https://bibliotekanauki.pl/articles/1031983.pdf
    Data publikacji:
    2016
    Wydawca:
    PPHU Projack Jacek Wąsik
    Tematy:
    dynamic balancing
    kicking velocity
    kicks kinematics
    movement analysis
    precision
    taekwon-do
    Opis:
    Velocity and accuracy of strike are important factors that help in achieving victory. The question is if the target selection can have an impact on the strike kinematics. The topic is especially important in the case of the traditional taekwon-do, in which a single kick might decide who the winner is. The aim of the paper is knowledge about the influence of the target on the kinematic factors of the front kick technique. In this study, a Polish Taekwon-do Championship runner-up was examined. The taekwon-do athlete (age: 28 years; body mass: 68 kg; height: 172 cm) is holding a 2nd degree, Motion analysis and data processing was prepared in HML (Human Motion Lab) using 10 NIR Vicon MX-T40 cameras with the acquisition speed of 100 to 2000 frames per second at full frame resolution of 4 megapixels. During the research various measurements were collected to perform dimensional analysis of foot and knee movement, describing their velocity changes as a function of time. The following strike speeds were recorded. No physical target: dominant leg foot 12.25 ± 0.18 m/s, non-dominant leg foot 13,92 ± 0,87 m/s. Small ball target/Punching ball: dominant leg foot 10,27 ± 0,29 m/s, non-dominant leg foot 10,03 ± 0,15 m/s. Kicking Shield/Shield: dominant leg foot 11,17 ± 0,34 m/s, non-dominant leg foot 10,06 ± 0,46 m/s. The quickest strike was registered when the athlete had no physical target in front of him. No focus on the target caused the fastest results. The shield target provoked a stronger and slower strike, as the speed has been slightly slower than in the non-target situation. The velocity of the foot was reduced the most when the most precision was needed. Aiming into a little ball caused the biggest speed to decrease the most. The main conclusion is that the more precision is needed, the more speed decrease will be observed.
    Źródło:
    Physical Activity Review; 2016, 4; 57-61
    2300-5076
    Pojawia się w:
    Physical Activity Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of the parameters of vibrations during dynamic balancing of the fan rotor according to Polish and International Standards
    Autorzy:
    Śloderbach, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/947331.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    parametry drgań
    wirnik wentylatora
    normy ISO
    wyważanie dynamiczne
    parameters of vibrations
    ISO standards
    fan rotor
    dynamic forces
    dynamic balancing
    Opis:
    In the paper a procedure and methodology of acceptable calculations of powers, displacements (of amplitudes) and velocities of pulses according to ISO standards depending on the rotational speeds (frequencies) of rotor during attempts of dynamic breaking down taking into account effectiveness of vibration isolation were described. The proposed method is regarding one-sidedly hung rotors appearing in such appliances as rotors of fans, blowers, pumps and others. As permissible parameters of pulses values which are given in international standards PN-ISO-10816-1:1998P and PN-ISO-7919-1:2001 were assumed. Calculations were compared in the form of tables and they depicted with relevant graphs which have the character of useful nomograms. Also, recommendations for the design of the foundations and guidelines related to dimensions of the foundation, the weight and the way of fixing the device were given. In the end also closing remarks and conclusions were given.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2019, 24, 2; 473-483
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Target effect on the kinematics of Taekwondo Roundhouse Kick – is the presence of a physical target a stimulus, influencing muscle-power generation?
    Autorzy:
    Wąsik, J.
    Shan, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/306526.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    wykorzystanie energetyczne
    prędkość
    precyzja
    balansowanie
    trade-off
    motor control pattern
    power generation
    kicking velocity
    precision
    dynamic balancing
    Opis:
    Taekwondo is famous for its powerful kicking techniques and the roundhouse kick is the most frequently used one. In earlier literature, the influence of a physical target (exiting or not) on kicking power generation has not been given much attention. Therefore, the aim of this study was to investigate the kinematics of roundhouse kick execution and its factors related to power generation. 6 ITF taekwondo practitioners voluntarily participated in this study. They were asked to perform kicks with and without a physical target. The first kick aimed at breaking a board while the second one was a kick into the air. A Smart-D motion capture system (BTS S.p.A., Italy) was used to quantitatively determine their kinematic characteristics during each kick. The main findings showed that kicks aiming at a breaking board were significantly slower than kicks without a physical target (maximal kick-foot velocities were 10.61 ± 0.86 m/s and 14.61 ± 0.67 m/s, respectively, p < 0.01), but the kicking time of the former was shorter (0.58 ± 0.01 s and 0.67 ± 0.01, respectively, p < 0.01). The results suggest that a physical target will negatively influence the kick-foot velocity, which is not necessarily a disadvantage for creating a high quality kick. Possible motor control mechanisms are discussed for the phenomenon. The study made it clear: trainings with and without physical targets would develop different motor control patterns. More studies are needed for identifying the effectiveness of different controls and efficiencies of their training.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2015, 17, 4; 115-120
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Balancing of planar six-bar mechanism with genetic algorithm
    Autorzy:
    Belleri, Basayya K.
    Kerur, Shravankumar B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1819162.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Koszalińska. Wydawnictwo Uczelniane
    Tematy:
    shaking force
    shaking moment
    dynamic balancing
    six-bar mechanism
    genetic algorithm
    wyważanie dynamiczne
    mechanizm 6-barowy
    algorytm genetyczny
    Opis:
    In the present work, the optimal balancing of the planar six-bar mechanism is investigated to minimize the fluctuations of shaking force and shaking moment. An optimization problem is formulated for balancing the planar six-bar mechanism by developing an objective function. The genetic algorithm and MINITAB software were used to solve the optimization problem. The selection of weighting factors has a crucial role to obtain the optimum values of design parameters. Two sets of weighting factors were considered as per the contribution of X and Y components of the shaking force and shaking moments. Shaking force and shaking moments were minimized drastically and were compared with the original values.
    Źródło:
    Journal of Mechanical and Energy Engineering; 2020, 4, 4; 303--308
    2544-0780
    2544-1671
    Pojawia się w:
    Journal of Mechanical and Energy Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Parallel anisotropic mesh refinement with dynamic load balancing for transonic flow simulations
    Autorzy:
    Gepner, S.
    Majewski, J.
    Rokicki, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/202281.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    parallel CFD
    adaptation
    dynamic load balancing
    mesh refinement
    parallel efficiency
    CFD
    dostosowanie
    dynamiczne obciążenia
    wydajność
    modele siatkowe
    Opis:
    The present paper discusses an effective adaptive methods suited for use in parallel environment. An in-house, parallel flow solver based on the residual distribution method is used for the solution of flow problems. Simulation is parallelized based on the domain decomposition approach. Adaptive changes to the mesh are achieved by two distinctive techniques. Mesh refinement is performed by dividing element edges and a subsequent application of pre defined splitting templates. Mesh regularization and derefinement is achieved through topology conserving node movement (r-adaptivity). Parallel implementations of an adaptive use the dynamic load balancing technique.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2017, 65, 2; 195-207
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modeling of a dynamic and intelligent simulator at the infrastructure level of cloud services
    Autorzy:
    Zegrari, Faouzia
    Idrissi, Abdellah
    Powiązania:
    https://bibliotekanauki.pl/articles/1837371.pdf
    Data publikacji:
    2020
    Wydawca:
    Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
    Tematy:
    load balancing
    cloud computing
    resource utilization
    dynamic environment simulation
    Opis:
    Cloud environments made up of a large number of compute and storage servers provide ondemand services in a usage-based consumption model (pay-as-you-go). Load balancing is one of the major problems in the cloud. Indeed, the dynamics of demand requirements and QoS, as well as the variability of cloud resources and its provisioning models make difficult the operation of performance evaluation of the system. To face this issue and to ensure the viability of cloud computing, IT resources must be managed effectively by a dynamic monitoring of the current workload of virtual machines (VMs). In this study, we propose the design of a cloud services simulation tool at the infrastructure level based on cloud computing simulation platform named CloudSim. It allows real-time monitoring of a load of each VM in terms of CPU utilization, memory utilization and bandwidth utilization ratio. The result of this case study can be useful for carry out dynamic environment simulations for VMs monitoring and fast decision making that can be used in load balancing mechanisms.
    Źródło:
    Journal of Automation Mobile Robotics and Intelligent Systems; 2020, 14, 3; 65-70
    1897-8649
    2080-2145
    Pojawia się w:
    Journal of Automation Mobile Robotics and Intelligent Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Performance-Based Dynamic Difficulty Adjustment and Player Experience in a 2D Digital Game: A Controlled Experiment
    Autorzy:
    Robb, Nigel
    Zhang, Bo
    Powiązania:
    https://bibliotekanauki.pl/articles/2150903.pdf
    Data publikacji:
    2022
    Wydawca:
    Univerzita sv. Cyrila a Metoda. Fakulta masmediálnej komunikácie
    Tematy:
    adaptive software
    digital games
    dynamic difficulty adjustment
    flow
    game balancing
    performance
    Opis:
    Dynamic difficulty adjustment (DDA) in digital games involves altering the difficulty of a game based on real-time feedback from the player. Some approaches to DDA use measurements of player performance, such as success rate or score. Such performance-based DDA systems aim to provide a bespoke level of challenge to each player, so that the game is neither too hard nor too easy. Previous research on performance-based DDA shows that it is linked to better player performance but finds mixed results in terms of player experience (e.g., enjoyment). Also, while the concept of flow is regarded as an important aspect of digital game experience, little research has considered the effects of performance-based DDA on flow. We conducted an experiment on the effects of performancebased DDA on player performance, enjoyment, and experience of flow in a digital game. 221 participants played either the DDA version of the game, a control version (difficulty remained constant), or an incremental version (difficulty increased regardless of performance). Results show that the DDA group performed significantly better. However, there were no significant differences in terms of enjoyment or experience of flow.
    Źródło:
    Acta Ludologica; 2022, 5, 1; 4-22
    2585-8599
    Pojawia się w:
    Acta Ludologica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Utilization Balancing Algorithms for Dynamic Multicast Scheduling Problem in EON
    Autorzy:
    Markowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/963830.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    elastic optical networks
    multicast
    load balancing
    flow assignment
    dynamic scheduling
    heuristic algorithms
    Opis:
    Dynamic data transfer demands are often being a challenge for present communication networks, as they appear in unpredictable time and must be satisfied prior to deadline. Important kind are the multi-target demands occurring in task of replication, backup, database synchronization or file transferring in pear-to-pear networks. Optimal scheduling usually depends of the nature of transport network. In the paper dynamic deadlinedriven multicast scheduling problem over elastic optical network is considered. Particularly, the method for improving link utilization by traffic balance for multicast demands is proposed. Few heuristic algorithms and results of experiments, proving the benefits of balancing concept are presented
    Źródło:
    International Journal of Electronics and Telecommunications; 2016, 62, 4; 363-370
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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