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Tytuł:
The effect of dynamic balance exercises on certain kinematic variables and jump shoot accuracy among female basketball players
Autorzy:
Alhawary, Ranya
Powiązania:
https://bibliotekanauki.pl/articles/1902562.pdf
Data publikacji:
2020-03-30
Wydawca:
Politechnika Opolska. Wydział Wychowania Fizycznego i Fizjoterapii
Tematy:
dynamic balance
motion analysis
jump shoot
accuracy
basketball
Opis:
The aim of the research is to identify the impact of dynamic balance exercises on certain Kinematic Variables andJump Shoot Accuracy among Female Basketball Players. Researchers used the experimental method for one groupwith pre - post Tests. The research sample was intentionally selected for Female Basketball Players under the ageof 16 at the Beni Suef club registered in the Egyptian Basketball Federation for the 2019 sports season andtotalling ten (10) players who were filmed during the Jump Shoot after dribbling to recognize certain KinematicVariables that affect shooting accuracy. Researchers conducted tests of front and lateral balance using a (MFT)device, Hexagon Test, Vertical jump from motion and skill tests to measure the accuracy and speed of the shoot.The implementation of the training program was conducted for eight weeks - five units per week; the time of eachunit was 120 minutes, including 40 min. devoted to balance exercises. The main findings showed improvementin the results of balance tests using the (MFT)device, Hexagon, vertical jump from motion, and improvement inthe motion path of the centre of gravity for the horizontal and vertical paths. It also showed benefits for thehorizontal displacement transfer of Momentum to vertical motion energy which enabled the player to reach thehighest point, and improvement of shooting angles which is considered the main factor in giving the ball theright trajectory in order to enter the ring to improve the ratio of the jump shoot. Researchers recommended thenecessity of using dynamic balance exercises within Female training programs.
Źródło:
Journal of Physical Education & Health - Social Perspective; 2019, 8, 14; 41-48
2084-7971
Pojawia się w:
Journal of Physical Education & Health - Social Perspective
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The development of postural control in 6–17 old years healthy children. Part I Postural control evaluation in modified Clinical Test for The Sensory Interaction on Balance in 6–17 old year children (mctsib)
Autorzy:
Orendorz-Frączkowska, Krystyna
Kubacka, Marzena
Powiązania:
https://bibliotekanauki.pl/articles/1397293.pdf
Data publikacji:
2020
Wydawca:
Index Copernicus International
Tematy:
balance maturation
balance system in children
posturography
static and dynamic balance
vestibulospinal reflexes
Opis:
Introduction: Proper development of postural control in children is connected with the maturation of the central nervous system, development of sensory organisation with appropriate use of proprioceptive, visual, vestibular information as well as reactions and postural strategy which allow the maintenance of balance in changeable environmental conditions. Developmental disturbances in this particular area is reflected in postural disfunctions and the assessment of these disfunctions and disturbances needs referring to normative values of the healthy population of children. Aim: Examination of postural control development in children aged 6–17 years. Material: 127 healthy children were tested (65 girls and 62 boys) aged 6–17 years. Method: Laryngological investigation, medical history interview, audiometry and tympanometry were conducted in all children. In the evaluation of postural control (mCTSIB-modified Clinical Test For The Sensory Interaction On Balance) a computer posturography system was used (Balance Master Neurocom). R esults: Further development of postural control was found in healthy children up to the age of 13 years of age. The development was not linear but showed transient characteristics with a faster development stage between the age of 6–7 and 8–9. Better postural control in girls, particularly the youngest, in comparison with boys was noticed. C onclusions: 1. The values of norm postural control in posturographic test mCTSIB in children aged 6–17 was established. In this test postural control development was completed in children before 13 year and it was not linear. 2. Due to gender differences it seems appropriate to use separate norms in order to evaluate the development of postural control in boys and girls.
Źródło:
Polish Journal of Otolaryngology; 2020, 74, 1; 29-35
0030-6657
2300-8423
Pojawia się w:
Polish Journal of Otolaryngology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ocena równowagi dynamicznej kobiet po mastektomii jednostronnej i protezowaniu zewnętrznym piersi –badania pilotażowe
Evaluation of the dynamic balance in women after unilateral mastectomy and external breast prosthesis – a pilot study
Autorzy:
Karczewska, E.
Szlachta, P.
Chamera, S.
Latosiewicz, R.
Powiązania:
https://bibliotekanauki.pl/articles/99069.pdf
Data publikacji:
2017
Wydawca:
Politechnika Śląska. Katedra Biomechatroniki
Tematy:
równowaga dynamiczna
mastektomia
proteza piersi
dynamic balance
mastectomy
breast prosthesis
Opis:
Celem pracy było określenie, czy protezowanie zewnętrzne w postaci wkładek silikonowych do biustonosza wpływa na równowagę dynamiczną kobiet po mastektomii jednostronnej. Grupę badaną stanowiło 30 kobiet po jednostronnej mastektomii całkowitej w wieku od 40 do 73 lat (średnio: 57,5±8,4), średni czas od zabiegu operacyjnego wynosił 6,5±5,0 lat. Do zbadania równowagi dynamicznej posłużono się platformą balansową „Libra” firmy Easytech. Wyniki: Z przeprowadzonych badań wynika, że bez względu na czas, jaki upłynął od mastektomii, noszenie protezy piersi nie ma wpływu na równowagę dynamiczną kobiet po tym zabiegu, podczas gdy wiek pacjentek oraz ograniczenie ruchomości obręczy barkowej mają istotne znaczenie dla reakcji równoważnych.
The aim of the study was to determine whether external prosthesis in the form of bra silicone inserts affects the dynamic balance in women after unilateral mastectomy. The study group was 30 women after unilateral mastectomy, in age between 40-73 years (average age was 57,5±8,4), average time from operation was 6,5±5,0 y. To explore the dynamic balance, the balance platform „Libra” (Easytech) was used. Results: the study showed that the period of wearing of the prosthesis had no impact on dynamic balance in women after mastectomy, whereas patients` age and limited mobility of the shoulder girdle was of considerable significance to balance responses.
Źródło:
Aktualne Problemy Biomechaniki; 2017, 13; 29-36
1898-763X
Pojawia się w:
Aktualne Problemy Biomechaniki
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The development of postural control in 6–17 old years healthy children. Part II Postural control evaluation – Limits of Stability Test (LOS) in 6–17 old year children
Autorzy:
Orendorz-Frączkowska, Krystyna
Kubacka, Marzena
Powiązania:
https://bibliotekanauki.pl/articles/1397378.pdf
Data publikacji:
2020
Wydawca:
Index Copernicus International
Tematy:
balance maturation
balance system in children
limits of stability
posturography
static and dynamic balance
Opis:
Introduction: The ability to Reach quickly to changing external stimuli, to move the body quickly and precisely in any direction and to maintain the centre of gravity above the support base, all contribute to maintaining balance in dynamic conditions. The Limits of Stability Test (LOS) provides information on the state of dynamic equilibrium in a standing position. Aim : Assessment of dynamic postural control in developmental age. Material : 127 healthy children (65 girls and 62 boys) aged 6 – 17years. Methods: All children underwent LOS test (posturograph NeuroCom) with registration of reaction time (RT), movement velocity (MVL), directional control (DCL) , maximum excursion (MXE) and endpoint excursion (EPE). Results: At the age of 6-7 years, not fully developed jumping strategy and visual feedback mechanism in the control of movement were observed. All tested parameters were significantly worse in children aged 6 – 9 years. After this period, a significant improvement in TR and MVL was observed, with no significant changes in subsequent age groups while significant improvement in MXE up to 12 , EPE and DCL up to 13 years of age was noted. No significant gender differences were fund in the LOS test parameters. Conclusions: 1 The LOS test showed significantly lower dynamic balance development in children aged 6 – 7 years. 2 The study showed a significant improvement in all parameters of the LOS test up to 13 years of age, which supports the termination of the function at that time.
Źródło:
Polish Journal of Otolaryngology; 2020, 74, 4; 18-24
0030-6657
2300-8423
Pojawia się w:
Polish Journal of Otolaryngology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Effects of Different Exercise Intensities on the Static and Dynamic Balance of Older Adults: A randomised Controlled Trial
Autorzy:
Ghasemabad, Kamran
Kamalden, Tengku
Dev, Roxana
Gasibat, Qais
Nekooei, Pooya
Majlesi, Sara
Nekouei, Paria
Alemi, Behzad
Powiązania:
https://bibliotekanauki.pl/articles/2148827.pdf
Data publikacji:
2022
Wydawca:
Uniwersytet Szczeciński. Wydawnictwo Naukowe Uniwersytetu Szczecińskiego
Tematy:
elderly
resistance training
high-intensity training
moderate-intensity training
low-intensity training
static balance
dynamic balance
Opis:
This study aims to find the effectiveness of different exercise intensities (high-, moderate-, and low-intensity) on the dynamic and static balance of elderly women. A single-blinded factorial design study was conducted in healthy older adults (>65 years) in 12 weeks. The authors have assessed the Forward Reach Test (FRT), Lateral Reach Test (LRT), One Leg Stand (OLS), Tandem Stand Test (TST) in 60 healthy older women at a gym centre, Fit House located in Bukit Rimau, Kuala Lumpur, Malaysia. Participants were randomly assigned to a High-Intensity Training (HIT) group; (n=15) (Mean age 69.60 ± 3.68) who performed four exercises [Leg Press (LP), Leg Extension (LE), Leg Curl (LC), and Calf Raises (CR)] at 80 to 90% of One-Repetition Maximum (1RM); Moderate-Intensity Training (MIT) group (n=15) (Mean age 69.27 ± 3.41) performed at 65 to 75% of 1RM; Low- Intensity Training (LIT) group (n=15) (Mean age 69.27 ± 1.94) performed at 50 to 60% of 1 RM; and a Control Group (CG) (n = 15) (Mean age 68.67 ± 2.38) with no training. Data was collected at pre-test, 4th, 8th, and 12th weeks of intervention. 60 participants were analysed and the main effect of time showed a statistically significant difference in the mean of all variables (all p < 0.001), and also there was a statistically significant interaction between intervention and time on all variables (all p < 0.001). Different levels of intensity on only the lower extremities muscles had a significant effect on the dynamic balance and static balance of the elderly population. After four weeks of training HIT, MIT, and LIT illustrated significant improvement in dynamic balance, as well as static balance.
Źródło:
Central European Journal of Sport Sciences and Medicine; 2022, 39; 49-64
2300-9705
2353-2807
Pojawia się w:
Central European Journal of Sport Sciences and Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stabilność posturalna u piłkarzy nożnych z przewlekłą niestabilnością stawu skokowo-goleniowego
Postural stability in football players with chronic ankle instability
Autorzy:
Stefaniak, Wojciech
Bączkowicz, Dawid
Powiązania:
https://bibliotekanauki.pl/articles/2152223.pdf
Data publikacji:
2019-01-23
Wydawca:
Fundacja Edukacji Medycznej, Promocji Zdrowia, Sztuki i Kultury Ars Medica
Tematy:
kontrola posturalna
równowaga dynamiczna
skręcenie stawu skokowego
postural control
dynamic balance
ankle sprain
Opis:
Wstęp. Piłkarze nożni narażeni są na częste urazy supinacyjne stawu skokowo-goleniowego, który, wielokrotnie powtarzany, sprzyja powstaniu przewlekłej niestabilności (CAI). Dotychczasowe badania wskazują, iż CAI nie wpływa istotnie na stabilność posturalną w warunkach statycznych, jednakże istnieją przypuszczenia, że w warunkach dynamicznych może mieć istotne znaczenie. Z tego powodu celem naszych badań była analiza stabilności posturalnej w warunkach dynamicznych, z uwzględnieniem dominacji kończyny dolnej. Materiał i metody. W badaniu wzięło udział 28 piłkarzy nożnych (w wieku 26,1±5,4) zakwalifikowanych do grupy CAI zgodnie z kryteriami kwalifikacji International Ankle Consortium oraz 37 piłkarzy (w wieku 27,3±5,2), bez wcześniejszej historii urazu supinacyjnego, tworzących grupę kontrolną (CTRL). Do oceny stabilności posturalnej w pozycji stania obunóż oraz jednonóż w warunkach dynamicznych wykorzystano platformę Biodex Balance System. Wyniki. W postawie obunóż zaobserwowano różnice istotne statystycznie (p<0,05) między grupami CAI (OSI 7,01±2,43; APSI 5,18±1,85) i CTRL (OSI 5,27±1,42; APSI 3,98± 1,42). W postawie jednonóż zauważono podobne trendy, gdzie CAI uzyskała istotnie statystycznie (p<0,05) wyższe wyniki w analizowanych parametrach. Funkcja kończyny dolnej odgrywała istotną rolę w grupie CTRL w parametrach OSI (dom. 7,23±1,48; n-dom. 5,64±1,51) oraz MLSI (dom. 3,8±0,64; n-dom. 3.07±0,97). Wnioski. CAI upośledza stabilność posturalną u piłkarzy nożnych w warunkach dynamicznych zarówno w postawie obunóż, jak i jednonóż, jednakże funkcja kończyny dolnej istotnie wpływa na kontrolę posturalną jedynie w grupie CTRL.
Background. Football players are exposed to frequent supination injuries of the talocrural joint and repeated injuries lead to chronic ankle instability (CAI). Previous study results indicate that CAI do not significantly affect postural stability under static conditions, however, it is suspected that it may aggravate under dynamic conditions. Therefore, the goal of this study was analysis of postural stability under dynamic conditions with regard to dominance of the lower limb. Material and methods. The sample comprised 28 football players (age = 26.1±5.4), included in CAI group according to the Ankle Consortium inclusion criteria and 37 football players (age = 27.3±5.2) with no history of supination injuries, included in the control group (CTRL). Biodex Balance System platform was used for postural stability assessment during single leg standing under dynamic conditions. Results. During single leg standing statistically significant between-group differences were noted (p<0.05). The following values were obtained in CAI and CTRL groups respectively: CAI: (OSI 7.01±2.43; APSI 5.18±1.85), CTRL: (OSI 5.27±1.42; APSI 3.98±1.42). During single leg standing similar trends were observed. CAI group obtained statistically significant (p<0.05), higher values of the studied parameters. Lower limb function played an important role in CTRL group as for OSI (dom. 7.23±1.48; n-dom. 5.64±1.51) and MLSI (dom. 3.8±0.64; n-dom. 3.07±0.97) parameters. Conclusions. CAI impairs postural stability in footballers under dynamic conditions, both during single and double leg standing, however, the lower limb function significantly affects postural control only in CTRL group.
Źródło:
Polish Journal of Sports Medicine; 2018, 34(4); 239-245
1232-406X
2084-431X
Pojawia się w:
Polish Journal of Sports Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamic Balance Optimisation for the Middle Shaft System of a Cotton Comber Based on ADAMS
Optymalizacja równowagi dymanicznej czesarki bawełniarskiej z użyciem programu ADAMS
Autorzy:
Xu, B.
Ma, Q.
Liu, X.
Powiązania:
https://bibliotekanauki.pl/articles/233902.pdf
Data publikacji:
2012
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
Tematy:
czesarka bawełniana
program ADAMS
drgania przędzarki
optymalizacja drgań
cotton comber
dynamic balance design
parameterization design
Opis:
For the vibration problem of a cotton comber, a model of the middle shaft system of a headstock was built using SOLIDWORKS software. It was found that the vibration was mainly caused by the shifting of the centroid. Then a dynamic optimisation model was established according to the dynamic balancing theory using the revolving method. The installment of the middle shaft system was optimised using ADAMS software with the aim of minimising its counterforce. The optimal value of the flange plate and timing regulation plan are given correspondingly. The results show that the noise and vibration of the comber CM500 are decreased significantly.
Dla rozważenia problemu drgań przędzarki bawełniarskiej, opracowano model zespołu wału środkowego głowicy wykorzystując program SOLIDWORKS. Stwierdzono, że wibracje powstają głównie przez przesunięcie środka ciężkości. Opracowano dynamiczny model optymizacji drgań zgodnie z teorią dynamicznego równoważenia. Opracowano sposób zamocowania wału z wykorzystaniem programu ADAMS, przyjmując jako kryterium minimum siły reakcji. Podano parametry zamocowania oraz schemat regulacji. Stwierdzono, że po optymalizacji wartość drgań i hałasu została wyraźnie zmniejszona.
Źródło:
Fibres & Textiles in Eastern Europe; 2012, 3 (92); 43-45
1230-3666
2300-7354
Pojawia się w:
Fibres & Textiles in Eastern Europe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
ТЕОРЕТИКО-МЕТОДОЛОГИЧЕСКОЕ ОБОСНОВАНИЕ КОРРЕКЦИОННЫХ МЕРОПРИЯТИЙ ПО СОХРАНЕНИЮ УСТОЙЧИВОСТИ И ДИНАМИЧЕСКОГО РАВНОВЕСИЯ В ВИДАХ БОРЦОВСКОЙ ДЕЯТЕЛЬНОСТИ
Autorzy:
Мацкевич, В. Н.
Масловский, Е. А.
Соболевски, К. З.
Стадник, В. И.
Powiązania:
https://bibliotekanauki.pl/articles/450594.pdf
Data publikacji:
2016
Wydawca:
Wyższa Szkoła Wychowania Fizycznego i Turystyki w Białymstoku
Tematy:
вестибулярная устойчивость
динамическое равновесие
виды борцовской деятельности
коррекционные мероприятия
модульно-рейтинговый подход
режим работы и отдыха
тренировочная деятельность
работоспособность
vestibular steadiness
dynamic balance
forms of wrestling activity
correlation procedures
set-rating system
operating and rest conditions
training activity
workability
Opis:
В статье представлено теоретико-методологическое обоснование повышения вестибулярной устойчивости и динамического равновесия в видах борцовской деятельности и научно обоснованы коррекционные мероприятия.
The article presents theoretical and methodological ground of the rise of vestibular steadiness and dynamic balance in forms of wrestling activity. The correlation procedures are scientifically based.
Źródło:
Roczniki Naukowe Wyższej Szkoły Wychowania Fizycznego i Turystyki w Białymstoku; 2016, 3(17); 59-63 s.
2081-1063
Pojawia się w:
Roczniki Naukowe Wyższej Szkoły Wychowania Fizycznego i Turystyki w Białymstoku
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The functional lateralization and computer dynamic posturography
Autorzy:
Tomaszewski, M.
Olchowik, G.
Olejarz, P.
Tomaszewska, M.
Powiązania:
https://bibliotekanauki.pl/articles/2052273.pdf
Data publikacji:
2014
Wydawca:
Akademia Bialska Nauk Stosowanych im. Jana Pawła II w Białej Podlaskiej
Tematy:
functional lateralization
computerized dynamic posturography
body balance
Opis:
Disorders in the functioning of the human body balance system exist in 20-30 % of adults and in 8-18% of children. The main causes of these aberrations are: benign positional vertigoes, migraine, anxiety disorders and depression, cerebrovascular diseases, brain traumas, labyrinthitis, toxic impairment of labyrinth, vestibular neuronitis, Ménière disease, brain tumours. Among the minor causes of these disorders are: internal ear disorders, inner ear circulation disorders, sclerosis multiplex (SM), epilepsy, arterial hypertension, postural hypertension, heart rhythm disorders, sclerosis, hypoglycaemia and involutional alternations (see: prezbiastazja). Human body balance disorders increase the risk of falls, which may threaten health and life. Frequency of these disorders raises with age, which is the cause of progressing degeneration of all the anatomical and functional systems, the efficiency of which affects the stability of the human body. Determination of the factors, which are related to a worse functioning of the body balance system of young people, who do not experience any clinical symptoms caused by this system is vital, especially in preventing falls and complications attributed to them. It allows to implement possibly early the preventive actions substantial for people encumbered by the risk factors. The aforesaid actions may consist in the alternation of a given factor (diet, sleep, physical activity). In case of  the factors, which are not subject to modifications (i.e. heterogeneous form of the functional lateralization), it is essential to prevent potential diseases that disturb the functioning of the body balance system, which is already impaired. This study aimed to acquaint with the findings concerning the evaluation of the functional lateralization enriched with a new diagnostic tool – a computerized dynamic posturography. The computerized dynamic posturography (CPD) is a state-of-the-art and faultless evaluation tool of the functional lateralization. It provides a comprehensive knowledge, which concerns not only the preferences of the body, but also constitutes an objective and quantitative diagnostic method for the disorders in the functioning of the body balance system. CPD differentiates a few clinical protocols: the Sensory Organization Test (SOT); the Motor  Control Test (MCT); the Adaptation Test (ADT). SOT evaluates the control of the body balance in different conditions (eyes closed/eyes opened;  environment moves/ground moves) of the sensory systems stimulation. MCT assesses the postural reactions (body postures) in response to an unexpected changes in the location of the feet prop surface. ADT  assesses the efficiency of the adaptation mechanisms in the body balance control.
Źródło:
Health Problems of Civilization; 2014, 08, 4; 20-26
2353-6942
2354-0265
Pojawia się w:
Health Problems of Civilization
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermal Balance of the Magneto-Hydro-Dynamic Pump for Recovery of Platinum Group Metals from Spent Auto Catalysts
Autorzy:
Gil, S.
Bialik, W.
Saternus, M.
Fornalczyk, A.
Powiązania:
https://bibliotekanauki.pl/articles/356349.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
thermal balance
magneto-hydro-dynamic pump
platinum group metals
Opis:
Every new car should be equipped with the catalyst, which limits the amount of harmful chemical compounds such as NOx, CH and CO emitted to the air. Auto catalyst consists of the ceramic or metallic carrier, on which is the layer with Platinum Group Metals playing catalytic role. There are many methods using for recovery those valuable metals from spent auto catalyst, however evry of those methods have some limitations. Proces described in the article is the modified method of metal collector, which used magnetohydrodynamic pump. Rotary electromagnetic field generates in the liquid metal rotary current, which as a consequence washing out the PGM metals from the ceramic carriers. Considering the possibilities of commercialization of the described method, the energy balance was made. From that balance the energetic efficiency of the unit was determined and the analysis of the temperature distribution was shown thermographycally.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 1; 253-256
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simplified analytical method for the robustness assessment of precast reinforced concrete structural systems
Autorzy:
Tur, Viktar
Tur, Andrei
Lizahub, Aliaksandr
Powiązania:
https://bibliotekanauki.pl/articles/1955933.pdf
Data publikacji:
2021
Wydawca:
Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
Tematy:
robustness
dynamic resistance
ties
energy balance method
membrane effect
Opis:
The article presents the simplified implementation of alternative load path method based on the energy balance approach. This method should be used to check the global resistance of a damaged structural system after the occurrence of an accidental event. Basic assumptions of simplified analytical models for modelling resistance of horizontal ties in a damaged structural system, taking into account the membrane (chain) effects, were presented. An approach to modelling the dynamic resistance of a damaged structural system based on the energy balance method is described. Calculated dependencies for checking the robustness of a prefabricated multi-storey building with hollow-core slabs after the loss of the central column are proposed and considered using an example. On the considered example, a comparison of the required tie sections area with the dynamic resistance designed using the energy balance method (EBM) and according to the current standards, and a statistical assessment of the reliability of the load-bearing capacity models are carried out. In the end, a brief algorithm for the simplified calculation of the dynamic resistance of a damaged structural system is proposed.
Źródło:
Budownictwo i Architektura; 2021, 20, 4; 93-114
1899-0665
Pojawia się w:
Budownictwo i Architektura
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Distance protection with dynamic thermal line rating enhancement
Autorzy:
Staszewski, Ł.
Rebizant, W.
Powiązania:
https://bibliotekanauki.pl/articles/410531.pdf
Data publikacji:
2012
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
dynamic thermal line rating
distance protection
overload
heat balance
Opis:
As the worldwide analysis of recent wide area cascading failures have shown, very often the main cause of blackout was mal-operation of the third zone of a distance protection relay. The load encroachment and power swing phenomena are the two dire problems to solve when dealing with the third zone of distance protection mal-function. The vast number of blackouts could have been avoided or the consequences lowered if the distance relay had not operated due to controlled impedance encroachment.This paper proposes a new approach to enhance the distance protection relay operation by introducing a new blocking algorithm. The algorithm is based on Dynamic Thermal Line Rating (DTLR) idea to restrain relay from tripping when conditions in electrical power system and weather conditions allow for it.
Źródło:
Present Problems of Power System Control; 2012, 2; 73-84
2084-2201
Pojawia się w:
Present Problems of Power System Control
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A simulation model of energy distribution in ship combustion engine
Autorzy:
Nguyen, H.
Powiązania:
https://bibliotekanauki.pl/articles/259168.pdf
Data publikacji:
2005
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
computer simulation
ship diesel engine
dynamic processes
energy balance and distribution
Opis:
In the paper a model of energy flow and distribution in ship diesel engine cylinder was presented. This is a model of discrete parameters, being a continuation of the author s research on simulation of energy processing within ship main propulsion engine [2,3]. The model in question makes it possible to calculate energy flow values delivered and transferred during every working cycle of the engine cylinder. Results of application of the model for 6ZA40S Sulzer engine installed on B672 ship were also attached. The results were compared with results of test-stand measurements of the engine, performed at different load levels.
Źródło:
Polish Maritime Research; 2005, 1; 22-26
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Static and dynamics of a pump impeller with a balancing device. Part II: dynamic analysis
Autorzy:
Martsinkovsky, V. A.
Zhulyov, A.
Kundera, C.
Powiązania:
https://bibliotekanauki.pl/articles/955212.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
pompa wirowa
wirnik
analiza dynamiczna
dynamic analysis
pump impeller
balance device
stability condition
Opis:
This paper presents the theoretical study of the system comprising an impeller and a balancing device. It deals with the dynamic analysis of the system, i.e., the axial vibrations of the impeller, and the system stability. The dynamic analysis took into account linearized hydrodynamic forces and moments generated in the longitudinal clearances of the seals of the impeller. The theoretical analysis was supplemented with a numerical example with characteristics determined for a real single-stage centrifugal pump.
Źródło:
International Journal of Applied Mechanics and Engineering; 2014, 19, 3; 621-631
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of the rotor eccentricity on the torque of a cage induction machine
Autorzy:
Silwal, B.
Rasilo, P.
Belahcen, A.
Arkkio, A.
Powiązania:
https://bibliotekanauki.pl/articles/141083.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
cage induction machine
dynamic eccentricity
electromagnetic torque
energy balance
finite element method
harmonics
Opis:
The non-uniform air gap in an electrical machine caused by rotor eccentricity creates an asymmetrical flux-density distribution in the air gap. This can affect the nominal torque produced by the machine. Eccentricity also produces forces that act on the rotor which may also have an effect on the torque. Thus, it is important to know how the torque of the machine behaves. In this paper, the torque of a cage induction machine is studied when the machine has dynamic eccentricity. The study is performed using the finite element method and a magnetic vector potential formulation. The torque is calculated by the method of energy balance. The harmonic components of the torque are also analyzed. The results show that the machine under eccentricity does not exhibit the same torque as a normal healthy machine. The harmonic components around the first principal slot harmonic is most affected.
Źródło:
Archives of Electrical Engineering; 2017, 66, 2; 383-396
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
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