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1
Content available Balancing of planar six-bar mechanism with genetic algorithm
Belleri Basayya K., Kerur Shravankumar B.
Journal of Mechanical and Energy Engineering
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2020
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Vol. 4, No 4
303--308
EN
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.
2
Content available remote Prototype of a device used for dynamic balancing power units of unmanned platforms
Ciszkowski Jarosław, Niszczota Paweł, Krogulec Przemysław
Journal of KONBiN
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2020
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Vol. 50, iss. 3
79--95
EN
The paper presents a prototype of a device used for dynamic balancing of motors and power units utilized in the construction of unmanned electric aerial vehicles. The concept of research was described and a measuring system depiction was included. A threedimensional model of a device functional prototype with its description was demonstrated. Additionally, research results of the system in the form of graphs were included.
PL
W pracy przedstawiono prototyp urządzenia służącego do wyważania dynamicznego silników i zespołów napędowych wykorzystywanych w budowie bezzałogowych statków powietrznych z napędem elektrycznym. Opisano koncepcję badań, a także zawarto opis systemu pomiarowego. Zademonstrowano model bryłowy urządzenia, prototyp funkcjonalny wraz z opisem. Dodatkowo zamieszczono wyniki badań systemu w postaci wykresów.
3
Content available Evaluation of the parameters of vibrations during dynamic balancing of the fan rotor according to Polish and International Standards
Śloderbach Z.
International Journal of Applied Mechanics and Engineering
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2019
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Vol. 24, no. 2
473--483
EN
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.
4
Content available Modernizacja stanowiska do wyważania dynamicznego
Słomion M., Matuszewski M., Krajnik W.
Postępy w Inżynierii Mechanicznej
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2017
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nr 10(5)
45--55
PL
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.
EN
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.
5
Content available Target effect on the kinematics of Taekwondo Roundhouse Kick – is the presence of a physical target a stimulus, influencing muscle-power generation?
Wąsik J., Shan G.
Acta of Bioengineering and Biomechanics
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2015
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Vol. 17, no. 4
115--120
EN
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.
6
Uproszczone obliczenia dopuszczalnych sił przemieszczeń i prędkości drgań w zależności od prędkości obrotowej wirnika podczas wyważania
Śloderbach Z.
Dozór Techniczny
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2001
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z. 1
5--9
7
Content available remote Vibration fault diagnosis and site dynaminc balance of rotary
Changzheng C., Heji Y.
Vibrations in Physical Systems
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2000
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Vol. 19
78--79
8
Wyważanie walców maszyn papierniczych nabiera znaczenia ze wzrostem ich prędkości
Sujka M., Marczewska J.
Przegląd Papierniczy
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1998
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R. 54, nr 4
217--218
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