Temat: load distribution - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: A prediction method for load distribution in threaded connections
Autorzy:: Zhang, D.
Gao, S.
Niu, S.
Liu, H.
Powiązania:: https://bibliotekanauki.pl/articles/949123.pdf
Data publikacji:: 2018
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: load distribution
threaded connections
finite element analysis
Opis:: A new method has been developed for predicting the load distribution along the thread portion of a bolt and nut connection. The calculated results were validated by comparison with three-dimensional finite element analysis and Yamamoto’s method. It was shown that the load distribution predicted by the model in this paper was in good agreement with the results from finite element model, and the load ratio on the first thread by the prediction model and finite element model was slightly larger than the results from Yamamoto’s method. In addition, the results of calculation and finite element analysis indicated that the decreasing of the lead angle could improve the load distribution, the increasing of the length of thread engaged could significantly improve the load bearing capacity of the first thread, and the adopting of a material with low stiffness for the nut with respect to the bolt could improve the load distribution slightly.
Źródło:: Journal of Theoretical and Applied Mechanics; 2018, 56, 1; 157-168
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: The computational model of the load distribution between elements in a planetary roller screw
Autorzy:: Ryś, J.
Lisowski, F.
Powiązania:: https://bibliotekanauki.pl/articles/281004.pdf
Data publikacji:: 2014
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: planetary roller screw
computational model
load distribution
Opis:: The paper presents a computational model of the load distribution between elements in a planetary roller screw. The idea of the model is to consider the deformations of rolling elements as deformations of rectangular volumes subjected to shear stresses. The contact deformations of threads and the deformations of screw and nut cores are taken into account by a properly chosen shear modulus. This modulus is computed on the basis of stiffness determined using the finite element method. Based on the relation between displacements and forces differential equations are obtained. The solution to these equations is a hyperbolic function that illustrates the load distribution on the threads between cooperating elements. The following considerations are carried out to assess the suitability of the analytical model for the preliminary design and analysis of this type of transmissions.
Źródło:: Journal of Theoretical and Applied Mechanics; 2014, 52, 3; 699-705
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Optimal load distribution estimation for fault location in electric power distribution systems
Autorzy:: Menchafou, Y.
Zahri, M.
Habibi, M.
El Markhi, H.
Powiązania:: https://bibliotekanauki.pl/articles/140980.pdf
Data publikacji:: 2017
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: electric power distribution systems
fault location
fictive load distribution
load variation
Opis:: Accurate fault location in an electric power distribution system (EPDS) is important in maintaining system reliability. Diverse methods have been proposed in the past. These methods whither require measurements at each load point or use single-step loads compensation, which is hardly available in practical uses. In this paper, a simple technique to bypass the load problems is proposed. The method requires calculating an optimal load distribution using the total load seen from the substation (The rated power of distribution transformers) and the network topology. The optimal load distribution is used as a fictive distribution to replace the real unknown one in fault location (FL) algorithms. The effectiveness of the proposed technique is demonstrated using a mathematical formulation first, and next, by several simulations with a classic iterative fault location algorithm. The test results are obtained from the numerical simulation using the data of a distribution line recognized in the literature.
Źródło:: Archives of Electrical Engineering; 2017, 66, 1; 77-87
1427-4221
2300-2506
Pojawia się w:: Archives of Electrical Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Identification of residual force in static load tests on instrumented screw displacement piles
Autorzy:: Krasiński, Adam
Wiszniewski, Mateusz
Powiązania:: https://bibliotekanauki.pl/articles/2037709.pdf
Data publikacji:: 2021
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: residual force
pile load test
pile instrumentation
load distribution
displacement pile
Opis:: Occurrence of the so-called residual force of an unknown value significantly disturbs interpretation of static load tests performed on piles equipped with additional measuring instruments. Screw displacement piles are the piling technology in which the residual force phenomenon is very common. Its formation mechanism is closely related to the installation method of this type of piles, which initiates generation of negative pile skin friction without any additional external factors. Knowledge of the value and distribution of a residual force (trapped in a pile shaft before starting the load test) is a necessary condition for the proper interpretation of instrumented pile test results. In this article, a clear and easy-to-use method of residual force identification, based on the analysis of shaft deformations recorded during pile unloading is presented. The method was successfully verified on two pile examples and proved to be effective and practical.
Źródło:: Studia Geotechnica et Mechanica; 2021, 43, 4; 438-451
0137-6365
2083-831X
Pojawia się w:: Studia Geotechnica et Mechanica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Impact of the wind load probability distribution and connection types on the reliability index of truss towers
Autorzy:: Mochocki, Wojciech
Obara, Paulina
Radoń, Urszula
Powiązania:: https://bibliotekanauki.pl/articles/1839658.pdf
Data publikacji:: 2020
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: steel truss towers
load distribution
system approach
reliability index
Opis:: The paper concerns the analysis of reliability of three truss towers performed with the system approach. The first stage of the reliability analysis involved determination of the reliability index for trusses while assuming the same reliability of elements. In the second stage, assessment of the reliability was made according to Eurocodes. The impact of the wind load probability distribution and connection types in towers on their reliability was analysed. In the capacity function, the following random variables were taken into account: cross-sectional area, yield strength, modulus of elasticity, minimum moment of inertia, and length of the element.
Źródło:: Journal of Theoretical and Applied Mechanics; 2020, 58, 2; 403-414
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Load distribution in the worm meshing
Autorzy:: Sabiniak, H. G.
Powiązania:: https://bibliotekanauki.pl/articles/281175.pdf
Data publikacji:: 2016
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: finite differences
circular plate
cantilever plates
worm teeth
load distribution
Opis:: The paper presents a theoretical analysis of deflections of circular and rectangular cantilever plates of an elastically built-in edge. The problem has been solved using the finite difference method. A method of determination of load distribution between two plates being in contact along an arbitrary line has been presented. Different shapes of these plates constitute models of mating of cylindrical and globoidal worm meshings. To verify the presented theory of searching for load distributions along the contact lines in these meshings, experimental investigations with the freezing of stresses in the cylindrical worm meshing have been carried out. Directions of investigations that would specify further theoretical considerations over load distribution in globoidal gear meshings have been indicated.
Źródło:: Journal of Theoretical and Applied Mechanics; 2016, 54, 4; 1169-1181
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Improved dynamic control method for energy storage units in PV dominated microgrids
Autorzy:: Wang, Q.
Liu, Y.
Song, W.
Xuan, K.
Powiązania:: https://bibliotekanauki.pl/articles/141382.pdf
Data publikacji:: 2018
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: current correction coefficient
load distribution
PV DC microgrid
secondary control
weighted calculation
Opis:: In a PV-dominant DC microgrid, the traditional energy distribution method based on the droop control method has problems such as output voltage drop, insufficient power distribution accuracy, etc. Meanwhile, different battery energy storage units usually have different parameters when the system is running. Therefore, this paper proposes an improved control method that introduces a reference current correction factor, and a weighted calculation method for load power distribution based on the parameters of battery energy storage units is proposed to achieve weighted allocation of load power. In addition, considering the variation of bus voltage at the time of load mutation, voltage secondary control is added to realize dynamic adjustment of DC bus voltage fluctuation. The proposed method can achieve balance and stable operation of energy storage units. The simulation results verified the effectiveness and stability of the proposed control strategy.
Źródło:: Archives of Electrical Engineering; 2018, 67, 4; 885-898
1427-4221
2300-2506
Pojawia się w:: Archives of Electrical Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: City logistics: influence of oversized road transport on urban development
Autorzy:: Szczucka-Lasota, B.
Powiązania:: https://bibliotekanauki.pl/articles/197386.pdf
Data publikacji:: 2017
Wydawca:: Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:: city logistics
oversized transport
load distribution
logistyka miejska
transport ponadgabarytowy
rozkład obciążenia
Opis:: This paper describes the influence of road transport on urbanization and the transport of oversized loads. There is an increasing interest in oversized transport and urban development. In this developmental context, it is necessary to transport heavy construction machinery, infrastructure elements, pipes for gas pipelines and waterworks, or even rails to create roads for rail transport. For this purpose, the transport of loads exceeding standard parameters (16.50 m in length, 2.55 m in width, 4.00 m in height and 40 Mg in mass) is used. Oversized traffic has many obstacles on the roads, such as low bridges and viaducts, narrow roads, poor technical condition of roads, road works and low-permeability roundabouts.
Źródło:: Zeszyty Naukowe. Transport / Politechnika Śląska; 2017, 97; 157-165
0209-3324
2450-1549
Pojawia się w:: Zeszyty Naukowe. Transport / Politechnika Śląska
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Analysis of selected solutions and methods to limit the uneven load distribution on the tooth width
Autorzy:: Juzek, M.
Wojnar, G.
Powiązania:: https://bibliotekanauki.pl/articles/198064.pdf
Data publikacji:: 2017
Wydawca:: Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:: gear wheel
contact stress
load distribution
koło zębate
naprężenie kontaktowe
rozkład obciążenia
Opis:: This article is dedicated to the subject of gearboxes, with a specific focus on the load distribution on the tooth. The aim of the study was to review the selected solutions and methods that can contribute to aligning the load on the width of the tooth. The structure and operation of each solution are described in detail. The paper presents the possible benefits of using the described solutions.
Źródło:: Zeszyty Naukowe. Transport / Politechnika Śląska; 2017, 96; 71-79
0209-3324
2450-1549
Pojawia się w:: Zeszyty Naukowe. Transport / Politechnika Śląska
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Effect of Straight-Line Mechanism Design on the Load Distribution in a Cycloidal Gear
Wpływ konstrukcji mechanizmu równowodowego na rozkład obciążeń w przekładni cykloidalnej
Autorzy:: Duda, H.
Warda, B.
Powiązania:: https://bibliotekanauki.pl/articles/188669.pdf
Data publikacji:: 2018
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:: cycloidal gear
straight line mechanisms
load distribution
obiegowa przekładnia cykloidalna
mechanizm równowodowy
rozkład obciążenia
Opis:: In the cycloidal gear, the torque is transmitted to the planet gears via an eccentric shaft with central bearings mounted on it. A straight-line mechanism is used to output the torque from the planet gears to the output shaft, a mechanism which consists of rotational sleeves mounted on the pins rigidly connected to the output shaft disc. These sleeves roll off in the holes of the planetary wheel. The forces generated in the straight-line mechanism affect the distribution of forces in the cycloid gearing and the amount of force loading the central bearing. The article presents the influence of the number of bolts of the straight-line mechanism on the load distribution in the cycloidal gear. The research carried out with the simulation program has shown that the smaller the number of pins, the greater the fluctuation of the force acting in the central bearing and the greater unevenness of force distributions in the cycloidal gear. This unevenness may cause a decrease in fatigue life of the meshing and central bearings.
W obiegowej przekładni cykloidalnej moment napędowy jest przekazywany na koła obiegowe za pośrednictwem wałka mimośrodowego z osadzonymi na nim łożyskami centralnymi. Do wyprowadzenia momentu obrotowego z kół obiegowych na wał wyjściowy służy mechanizm równowodowy, który tworzą tuleje osadzone obrotowo na sworzniach sztywno powiązanych z tarczą wału wyjściowego. Tuleje te odtaczają się w otworach koła obiegowego. Siły powstające w mechanizmie równowodowym wpływają na rozkłady sił w zazębieniu cykloidalnym oraz na wielkość siły obciążającej łożysko centralne. W artykule przedstawiono wpływ liczby sworzni mechanizmu równowodowego na rozkład obciążeń w przekładni cykloidalnej. Badania przeprowadzone za pomocą opracowanego programu symulacyjnego pokazały, że im mniejsza liczba sworzni, tym większe wahania siły działającej w łożysku centralnym i większa nierównomierność rozkładów sił w zazębieniu cykloidalnym. Nierównomierność ta może być przyczyną zmniejszenia trwałości zmęczeniowej zazębienia oraz łożysk centralnych.
Źródło:: Tribologia; 2018, 279, 3; 35-42
0208-7774
Pojawia się w:: Tribologia
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: Stress and load distribution analysis in bolt connection with modified thread profile under high temperature conditions
Autorzy:: He, Liange
Zhang, Bin
Guo, Caidong
Shi, Wenjun
Powiązania:: https://bibliotekanauki.pl/articles/2055053.pdf
Data publikacji:: 2021
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: bolt connection
thread design
load distribution of bolt
high temperature creep test
finite element analysis
Opis:: In this paper, the load distribution of a bolt connection structure with a variable thread profile at high temperature is investigated. The parameters of time-hardening creep model of aluminum alloy at high temperature were obtained by fitting the uniaxial creep tensile test data of aluminum alloy at 250◦C. Based on ABAQUS, a two-dimensional axisymmetric model of the bolt connection structure was established, and according to the thread load distribution considering linear elasticity, plasticity and creep characteristics, modification of standard metric thread profile was carried out. The load distribution law of the thread of the modified bolt connection structure were investigted. The results show that the load- -bearing ratio of the first thread can be significantly reduced and the load-bearing distribu- tion uniformity of all threads can be improved when the modified thread is applied to the bolt connection structure.
Źródło:: Journal of Theoretical and Applied Mechanics; 2021, 59, 3; 469--480
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:: Mechanical systems with air spring flexible elements
Autorzy:: Vinogradov, Borys
Powiązania:: https://bibliotekanauki.pl/articles/196228.pdf
Data publikacji:: 2019
Wydawca:: Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:: air spring
rubber-cord shells
load distribution
flexible
sprężyna pneumatyczna
człony pneumatyczno-elastyczne
rozkład obciążenia
elastyczny
Opis:: The purpose of this study was to assess the effectiveness of flexible air-spring systems operating in parallel to share the total load, taking into account installation and in-operation errors. This study presented experimental and calculated characteristics of the air spring flexibility and its dependence on the polytropic index and additional volume. It considered patterns of load distribution between the air springs when they are operating in parallel to share the total load for the case when the air springs were used as the supporting elements for various machines and units, and between transmission lines containing flexible couplings, where air springs were installed as flexible elements.
Źródło:: Zeszyty Naukowe. Transport / Politechnika Śląska; 2019, 103; 199-207
0209-3324
2450-1549
Pojawia się w:: Zeszyty Naukowe. Transport / Politechnika Śląska
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 13.

Tytuł:: A new method of decision making in multi-objective optimal placement and sizing of distributed generators in the smart grid
Autorzy:: Khoshayand, Hossein Ali
Wattanapongsakorn, Naruemon
Mahdavian, Mehdi
Ganji, Ehsan
Powiązania:: https://bibliotekanauki.pl/articles/2202555.pdf
Data publikacji:: 2023
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: backward-forward load distribution
fuzzy logic
iterative search algorithm
multi-objective optimization
shortest distance from the origin
weighted sum
Opis:: One of the most important aims of the sizing and allocation of distributed generators (DGs) in power systems is to achieve the highest feasible efficiency and performance by using the least number of DGs. Considering the use of two DGs in comparison to a single DG significantly increases the degree of freedom in designing the power system. In this paper, the optimal placement and sizing of two DGs in the standard IEEE 33-bus network have been investigated with three objective functions which are the reduction of network losses, the improvement of voltage profiles, and cost reduction. In this way, by using the backward-forward load distribution, the load distribution is performed on the 33-bus network with the power summation method to obtain the total system losses and the average bus voltage. Then, using the iterative search algorithm and considering problem constraints, placement and sizing are done for two DGs to obtain all the possible answers and next, among these answers three answers are extracted as the best answers through three methods of fuzzy logic, the weighted sum, and the shortest distance from the origin. Also, using the multi-objective non-dominated sorting genetic algorithm II (NSGA-II) and setting the algorithm parameters, thirty-six Pareto fronts are obtained and from each Pareto front, with the help of three methods of fuzzy logic, weighted sum, and the shortest distance from the origin, three answers are extracted as the best answers. Finally, the answer which shows the least difference among the responses of the iterative search algorithm is selected as the best answer. The simulation results verify the performance and efficiency of the proposed method.
Źródło:: Archives of Electrical Engineering; 2023, 72, 1; 253--271
1427-4221
2300-2506
Pojawia się w:: Archives of Electrical Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 14.

Tytuł:: Study on the impact of electric vehicle charging load on nodal voltage deviation
Autorzy:: Ma, G.
Jiang, L.
Chen, Y.
Dai, C.
Ju, R.
Powiązania:: https://bibliotekanauki.pl/articles/141119.pdf
Data publikacji:: 2017
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: distribution network
electric vehicle charging load (EVCL)
stochastic load
voltage deviation
Opis:: The promotion and application of electric vehicles will contribute to the solution of several problems, such as energy shortage and environmental pollution, and the achievement of country economy and energy security. But a large-scale vehicle-to-grid system may cause adverse effects in the distribution network operation, the power network planning and such other parts. First, this paper collects the factors that influence the electric vehicle charging load and establishes the EV charging load model with a Monte- Carlo method. Then, we analyze the effect that the EV charging load made on the nodal voltage deviation under different permeability based on the IEEE30 node system. At last, this research gets the conclusion that the nodal voltage deviation is closely related to EV permeability, node type and node location. This research conclusion will provide practical guidance to the charging station planning.
Źródło:: Archives of Electrical Engineering; 2017, 66, 3; 495-505
1427-4221
2300-2506
Pojawia się w:: Archives of Electrical Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 15.

Tytuł:: Stochastic local load redistribution in the fibre bundle model of nanopillar arrays
Autorzy:: Derda, T.
Powiązania:: https://bibliotekanauki.pl/articles/122972.pdf
Data publikacji:: 2015
Wydawca:: Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
Tematy:: nanopillars
fibre bundle model
stochastic load redistribution
skew normal distribution
local load sharing
Opis:: We study the breakdown of the nanopillar arrays subjected to axial loading. The pillar-strength-thresholds are drawn from a given probability distribution. Pillars are located in the nodes of the supporting regular lattice. In this work we introduce stochastic local load sharing - after pillar breakdown each of its nearest intact neighbours obtains a random fraction of the failing load. Two types of loading procedure are employed, namely quasi-static and finite force. We analyse critical loads, catastrophic avalanches as well as probabilities of cascade and breakdown.
Źródło:: Journal of Applied Mathematics and Computational Mechanics; 2015, 14, 4; 19-30
2299-9965
Pojawia się w:: Journal of Applied Mathematics and Computational Mechanics
Dostawca treści:: Biblioteka Nauki

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