Temat: dynamics analysis - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Type synthesis, modelling and analysis of the manipulator for wheel-legged robot
Autorzy:: Szrek, J.
Muraszkowski, A.
Sperzyński, P.
Tematy:: mobile manipulator
multibody dynamics analysis
wheel-legged platform
robot mobilny
manipulator mobilny
dynamika układów wieloczłonowych; Pokaż więcej
Wydawca:: Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Powiązania:: https://bibliotekanauki.pl/articles/386987.pdf Link otwiera się w nowym oknie
Opis:: The aim of this article is to present the concept of wheel-legged mobile manipulator, which is a combination of mobile platform with specially selected suspension system and a manipulator. First, a literature review was performed and own solution proposed. The kinematic structure of manipulator, selected simulation results, physical model and the concept of the control system has been presented. Geometry synthesis was used to design basic dimension. Structural synthesis was performed according to the intermediate chain method. Simulations were performed using the multibody dynamics simulation software. New approach in the field of the mobile manipulators was presented as a result.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Dynamic Analysis of the Starting and Braking of the Table of CNC Machine Tool
Autorzy:: Józwik, Jerzy
Zawada-Michałowska, Magdalena
Moń, Damian
Tematy:: dynamics analysis
vision systems
CNC machine tool
feed rate
CNC machine tools accuracy
CNC machine table; Pokaż więcej
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Powiązania:: https://bibliotekanauki.pl/articles/2201776.pdf Link otwiera się w nowym oknie
Opis:: The aim of the paper is a dynamic analysis of the starting and braking of the table of a numerically controlled CNC machine tool during idle motion. The experimental test was performed on the vertical table of the FV580A machining centre using the Phantom v1610 high-speed vision camera. The dynamics characteristics of the table movement were registered and the dynamics estimates of the movement were determined. The influence estimation of the parameters of the machine tool table motion on the value of the determined estimates was made. The results of measurements were discussed and guidelines and in order to minimise disturbances were formulated. The test results were summarised and discussed in the form of charts and tables. The directions of further research in the discussed subject area were also defined
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: A model for dynamic analysis of a 5pk belt transmission in dry or wet conditions
Autorzy:: Kubas, K.
Tematy:: belt transmissions
dynamics analysis
friction
poly-V belt
wet belt
przekładnie pasowe
analiza dynamiki
tarcie
pas poliklinowy; Pokaż więcej
Wydawca:: Sieć Badawcza Łukasiewicz. Przemysłowy Instytut Motoryzacji
Powiązania:: https://bibliotekanauki.pl/articles/263356.pdf Link otwiera się w nowym oknie
Opis:: A belt transmission model with dry or partially wet belt models used for dynamic analysis has been presented in this paper. A two-dimensional discrete model was created, consisting of rigid elements connected with each other by means of longitudinal and torsional spring-damping elements (SDEs). The belt-pulley contact phenomena were described with the use of a model with appropriate stiffness and damping between the contacting surfaces and a simplified Threlfall friction model was used to describe the friction phenomenon. Motion of the transmission is triggered under the influence of torque loads applied on the pulleys. Calculations results are presented of reaction, contact and friction forces acting on dry and partially wet belt. Finally, an example of using the model to analyse the dynamics of a wet automotive belt transmission system driving the alternator and coolant pump has been presented.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Keystroke dynamics analysis using machine learning methods
Autorzy:: Shabliy, Nataliya
Lupenko, Serhii
Lutsyk, Nadiia
Yasniy, Oleh
Malyshevska, Olha
Tematy:: keystroke dynamics analysis
Machine Learning
Neural Network
Supervised Learning
classification problem
analiza dynamiki uderzeń klawiszy
uczenie maszynowe
sieć neuronowa
uczenie nadzorowane
problem klasyfikacji; Pokaż więcej
Wydawca:: Polskie Towarzystwo Promocji Wiedzy
Powiązania:: https://bibliotekanauki.pl/articles/1956034.pdf Link otwiera się w nowym oknie
Opis:: The primary objective of the paper was to determine the user based on its keystroke dynamics using the methods of machine learning. Such kind of a problem can be formulated as a classification task. To solve this task, four methods of supervised machine learning were employed, namely, logistic regression, support vector machines, random forest, and neural network. Each of three users typed the same word that had 7 symbols 600 times. The row of the dataset consists of 7 values that are the time period during which the particular key was pressed. The ground truth values are the user id. Before the application of machine learning classification methods, the features were transformed to z-score. The classification metrics were obtained for each applied method. The following parameters were determined: precision, recall, f1-score, support, prediction, and area under the receiver operating characteristic curve (AUC). The obtained AUC score was quite high. The lowest AUC score equal to 0.928 was achieved in the case of linear regression classifier. The highest AUC score was in the case of neural network classifier. The method of support vector machines and random forest showed slightly lower results as compared with neural network method. The same pattern is true for precision, recall and F1-score. Nevertheless, the obtained classification metrics are quite high in every case. Therefore, the methods of machine learning can be efficiently used to classify the user based on keystroke patterns. The most recommended method to solve such kind of a problem is neural network.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Analysis of procurement of selected agricultural products in Poland in the years 2010-2016
Analiza skupu wybranych produktów rolnych w Polsce w latach 2010-2016
Autorzy:: ROSZKO-WÓJTOWICZ, Elżbieta
GRZELAK, Maria M.
Tematy:: agriculture
procurement of agricultural produce
crop production
animal production
dynamics analysis
aggregate indices
rolnictwo
skup produktów rolnych
produkcja roślinna
produkcja zwierzęca
analiza dynamiki
indeksy agregatowe; Pokaż więcej
Wydawca:: Uniwersytet Opolski
Powiązania:: https://bibliotekanauki.pl/articles/435155.pdf Link otwiera się w nowym oknie
Opis:: Economic development is characterised by the fact that the share of agriculture tends to decrease both in terms of resources used and domestic product generated. This does not mean, however, that the role of agriculture in the economic development diminishes. It can be considered a paradox that the lower the share of agriculture in the national economy, the greater its role, as it provides raw materials for the production of goods, especially food, which meet the needs of the ever-growing community. The main aim of the presented study is to measure and evaluate changes in agricultural produce procurement in Poland in the years 2010-2016. The following research hypothesis is put forward in the study: Changes in the procurement volume had a much greater impact on the procurement value of selected agricultural produce in Poland in the period considered than changes in the level of transaction prices. In the paper, a comparative analysis of procurement of crop and animal products was conducted. The research process was based primarily on data derived from official statistics obtained from the Central Statistical Office and the Eurostat database regarding procurement of agricultural produce carried out by commercial entities and processing plants. This information is presented in qualitative and quantitative terms for total agriculture, as well as for individual voivodeships.
Prawidłowością rozwoju gospodarczego jest to, że zmniejsza się udział rolnictwa zarówno w wykorzystanych zasobach, jak i w tworzonym produkcie narodowym. Nie oznacza to jednak, że zmniejsza się rola rolnictwa w rozwoju gospodarczym. Można uważać, za paradoks, że im mniejszy odsetek stanowi rolnictwo w gospodarce narodowej, tym większa jest jego rola, albowiem dostarcza ono surowców do wytwarzania dóbr, zwłaszcza żywnościowych, zaspokajających potrzeby coraz liczniejszej społeczności. Głównym celem niniejszego badania jest pomiar i ocena zmian skupu produktów rolnych w Polsce w latach 2010-2016.W niniejszym badaniu postawiono hipotezę badawczą: Zmiany w wolumenie skupu wywarły znacznie większy wpływ na wartość skupu wybranych produktów rolnych w Polsce w badanym okresie aniżeli zmiany w poziomie cen transakcyjnych. W artykule przeprowadzona została analiza porównawcza skupu towarów produkcji roślinnej oraz skupu towarów produkcji zwierzęcej Postępowanie badawcze oparto, przede wszystkim, na danych statystyki publicznej pozyskanych z Głównego Urzędu Statystycznego oraz bazy Eurostat z zakresu skupu produktów rolnych prowadzanego przez jednostki handlowe i przetwórcze. Informacje te prezentowane są w ujęciu ilościowym i wartościowym dla rolnictwa ogółem oraz dla województw.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Good practices of Polish companies in terms of sustainable development challenges
Autorzy:: Czerska, Iwona
Korpak, Tetiana
Tematy:: CSR
sustainable development
good practices
analysis of the dynamics
rozwój zrównoważony
dobre praktyki
analiza dynamiki; Pokaż więcej
Wydawca:: Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Powiązania:: https://bibliotekanauki.pl/articles/324971.pdf Link otwiera się w nowym oknie
Opis:: The study deals with the practical dimension of CSR initiatives, pointing to the good practices of an increasing number of companies in Poland in the context of their development. The CSR concept is gaining more importance in the development of companies and the idea of socially responsible business, implemented and consistently performed by enterprises, can significantly contribute to the growth of competitiveness on the market, building company’s value and shaping a lasting advantage over competitors. The main objective of the study was to examine good practices of Polish companies in terms of sustainable development challenges. The specific objective of this paper was to indicate the areas of corporate social responsibility in selected companies. The analysis focused on the following CSR areas: community involvement and development, consumer issues, the environment and labour practices. The study of the subject literature and websites on good CSR practices and the statistical and econometric analysis were used as research methods. A comparative analysis of CSR initiatives of selected companies was performed, comparing the tabulated information from the last few years. For the number of companies and practices in 2014-2018, the analysis of the dynamics was performed. First, simple indexes (one-base and chain) were determined. Next, the mid-term chain index and the mid-term rate of change were calculated and interpreted. Finally, for both variables, a linear trend model was determined. The results of the dynamics’ analysis indicated a clear upward trend both in terms of the number of socially responsible companies in Poland, and in the amount of good practices implemented by those companies. In the following years, a further systematic increase in the values of both variables is to be expected.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Numerical investigation into flight dynamics of an agile aircraft
Autorzy:: Sibilski, K.
Tematy:: non-linear flight dynamics
trajectory analysis; Pokaż więcej
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Powiązania:: https://bibliotekanauki.pl/articles/279799.pdf Link otwiera się w nowym oknie
Opis:: The aim of this study is to prove practical applicability of a numerical simulation technique in highlights some of the features of the flight under extreme conditions. dynamics of spatial motion of an agile aircraft is considered. After a brief description of an aircraft mathematical model, the numerical analyses are presented. There have been considered various flight events (such as airdrop or aircraft accident) and manoeuvres (in particular, those performed at high angles of attack).
Numeryczne badanie dynamiki lotu samolotów o podwyższonej sterowności. Rozpatrzono dynamikę samolotu o podwyższonej sterowności. Badania prowadzono stosując symulację komputerową. Zaprezentowano wyniki dynamiki ruchu samolotu w różnych stanach lotu i manewrach.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Dynamical analysis of a constrained flexible extensible link with rigid support and clearance
Autorzy:: Dupac, M
Tematy:: multibody dynamics
impact analysis
contact forces; Pokaż więcej
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Powiązania:: https://bibliotekanauki.pl/articles/280562.pdf Link otwiera się w nowym oknie
Opis:: Dynamic response of robotic systems is affected by deformation of their flexible components, velocity and mass of the systems, as well as by the presence of clearance or impact between the components. Since accurate simulations of such robotic systems are increasingly important, the modelling and dynamical behaviour of an extensible mechanism with a rigid crank and a flexible link is investigated in this paper. The equations of motion of the extensible flexible link, constrained to a circular, Cartesian, elliptical, Cassinian, Lame or pear-shaped quartic path, are presented. A dynamical analysis is carried out in order to compare the dynamical response of the flexible link vs. a rigid link under the combined effect of different parameters such as flexibility and clearance. The simulation result shows clear trajectories divergence due to the impact effect of the flexible link on the rigid crank.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Sensitivity Analysis and Optimization for Selected Supply
Autorzy:: Marjasz, Rafał
Kasperska, Elżbieta
Mateja-Losa, Elwira
Wydawca:: Wyższa Szkoła Biznesu - National Louis Univeristy
Cytata wydawnicza:: Kasperska, E., Mateja-Losa, E., Marjasz, R., Sensitivity Analysis and Optimization for Selected Supply Chain Management Issues in the Company – Using System Dynamics and Vensim. Journal of Entrepreneurship, Management and Innovation (JEMI), 2013, vol. 9, nr 2 : System Theories and Practice. Ed. by M. Baran, K. Śliwa, s. 29-44
Opis:: The aim of our paper is to present the new results of research work on optmizaton and simulaton for some logistc problems in the company. The System Dynamics (SD) method and the Vensim simulaton language are applied in order to solve specifc managerial problems described by Forrester in the model of supply chain. The historical model of Customer-Producer-Employment System by Forrester (Forrester, 1961) has not been examined with the sensitvity analysis, from the “automatc” testng perspectve. Optmizaton experiments have not been conducted, either. It is surprising, since the model is old and widely known. The opportunites oﬀered by the Vensim language allow us to perform such analysis. The visualizaton called “confdence bounds“ is used, to show the behaviour of chosen variables over a period of tme. The Monte-Carlo method is applied for sampling a set of numbers from within bounded domains (distributon for each searching parameters is specifed). The authors of this paper conducted numerous experiments in this scope. This paper presents their results and oﬀers some conclusions formulated at the end.
Dostawca treści:: Repozytorium Centrum Otwartej Nauki

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Skocz do pozycji: 10.

Tytuł:: Sensitivity Analysis and Optimization for Selected Supply Chain Management Issues in the Company – Using System Dynamics and Vensim
Autorzy:: Kasperska, Elżbieta
Mateja-Losa, Elwira
Marjasz, Rafał
Tematy:: System Dynamics
sensitivity analysis
optimization
Vensim; Pokaż więcej
Wydawca:: Fundacja Upowszechniająca Wiedzę i Naukę Cognitione
Powiązania:: https://bibliotekanauki.pl/articles/475034.pdf Link otwiera się w nowym oknie
Opis:: The aim of our paper is to present the new results of research work on optimization and simulation for some logistic problems in the company. The System Dynamics (SD) method and the Vensim simulation language are applied in order to solve specific managerial problems described by Forrester in the model of supply chain. The historical model of Customer-Producer-Employment System by Forrester (Forrester, 1961) has not been examined with the sensitivity analysis, from the “automatic” testing perspective. Optimization experiments have not been conducted, either. It is surprising, since the model is old and widely known. The opportunities offered by the Vensim language allow us to perform such analysis. The visualization called “confidence bounds“ is used, to show the behaviour of chosen variables over a period of time. The Monte-Carlo method is applied for sampling a set of numbers from within bounded domains (distribution for each searching parameters is specified). The authors of this paper conducted numerous experiments in this scope. This paper presents their results and offers some conclusions formulated at the end.
Dostawca treści:: Biblioteka Nauki

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