Temat: dynamic balancing - Katalog OPAC zbiorów

Skocz do pozycji: 1.

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

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Skocz do pozycji: 2.

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

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Skocz do pozycji: 3.

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

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Skocz do pozycji: 4.

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

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Skocz do pozycji: 5.

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

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