Temat: cycle load - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: A fatigue testing in complex stress state in the context of problems in the diagnosis and detecting defects in materials of wheels in locomotives
Autorzy:: Czapczyk, K.
Powiązania:: https://bibliotekanauki.pl/articles/241777.pdf
Data publikacji:: 2012
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: multiaxial fatigue
bending
twisting
low cycle load
high cycle load
axles of locomotives
Opis:: This paper presents preliminary results of fatigue tests of selected construction materials, which have been exposed to the simultaneous operation of the bending and torsional loads at different mix of these loads. This kind of load generally applies to much responsible construction, especially of machinery for transport. For example, rail transport is one of the most popular measures, which uses different types of locomotives. However, it is no matter what sort of the type of railway vehicle it is, because in each there we can notice a multi-axis load driving axle wheel assemblies. During the technical inspection of these items, ultrasonic flaw detectors are used to detect damage in the material that arose during the exploitation, but are not visible during the external inspection. For this reason, there are many problems, that arise during the diagnostic process using ultrasonic flaw detectors, because it is not always possible to accurately detect the resulting or arising defect in the material axes, especially in some of the built-axes, which can be studied only from the front (on both sides of the mounting of bearings). Taking into account the safety and technical problems in rail transport, it is important to carry out fatigue tests of low- and high-cycles on samples subjected to multiaxial stress state. Initially, there were taken into account the lightweight aluminum (AlMg2Mn0.47Fe0.5) that have been repeatedly multiaxial charged at different percentage of bending and twisting. The results will be referenced to the occurrence of the bending and twisting, as well as to the results obtained with the simultaneous influence of corrosive conditions due to the attempt to make the best possible mapping of the prevailing conditions in which different structural elements must actually work. The load on the low cycle fatigue and high cycle fatigue were chosen after corrosion- stress testing on the same aluminum alloy. In addition, cases of multiaxial fatigue are not as described and explained in detail as the cases of uniaxial fatigue. In spite of this fact, it is necessary to create detailed criterions for multiaxial with low- and high-cycles load.
Źródło:: Journal of KONES; 2012, 19, 4; 149-154
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 2.

Tytuł:: Possibility of the charge exchange work diminishing of an internal combustion engine in part load
Autorzy:: Postrzednik, S.
Żmudka, Z.
Powiązania:: https://bibliotekanauki.pl/articles/247156.pdf
Data publikacji:: 2011
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: engine efficiency
charge exchange work
engine load
valve actuating
thermodynamic cycle
Opis:: Internal combustion engines, used for driving of different cars, occur not only at the full load, but mostly at the part load. The relative load exchange work at the full (nominal) engine load is significant low. At the part load of the IC engine his energy efficiency r)e is significantly lower than in the optimal (nominal field) range of the performance parameters. One of the numerous reasons of this effect is regular growing of the relative load exchange work of the IC engine. The load exchange work of IC engine essentially determines the effective engine efficiency. It is directly connected with the quantitative regulation method common used in the IC engines. From the thermodynamic point of view - the main reason of this effect is the throttling process (causing exergy losses) occurring in the inlet and outlet channels. The known proposals for solving of this problem are based on applying of the fully electronic control of the motion of inlet, outlet valves and new reference cycles. The independent actuating (steerage) procedures of the ICE inlet valves should assure the adequate mass of the fresh charge, while procedures of the outlet valves are focused on the optimal exhaust gas recirculation rate, according to the engine load. The idea presented in the paper leads to diminishing the charge exchange work of the IC engines. The mentioned above problem can be solved using presented in the paper a new concept of the reference cycle (called as eco-cycle) of IC engine.
Źródło:: Journal of KONES; 2011, 18, 4; 377-387
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 3.

Tytuł:: Effective efficiency in car engine as a function of reduction ratio during energy-aying speed control
Autorzy:: Ubysz, A.
Powiązania:: https://bibliotekanauki.pl/articles/246247.pdf
Data publikacji:: 2010
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: power efficiency
driving cycle
effective engine efficiency
B. S. F. C.
load torque
Opis:: The study examines the effect of transformation ratio in power transmission system on engine efficiency as a function of passenger vehicle velocity (m = 1400 kg) with energy-saving vehicle drive. The study also presents working range in driving phases for energy-saving speed control up to 120 km/h for a simplified overall engine performance map for SI engine. Understanding of the presented considerations can be facilitated through relating with advantages of application of non-driving phases in low engine load phases (field 4 in overall engine performance map). Working points of SI engines in engine performance maps were divided in terms of energy-saving vehicle speed control into 4 ranges. Zone l is the most economic whereas zones 3 and 4 are the least energy-saving, which was also discussed by the author in other works. The study presents the location of engine working points in overall engine performance map during energy-saving vehicle speed control within the range of 30-120 km/h using two different 6-gear gearboxes. Working range for CI engine in simplified overall characteristics in truck, the impact of speed control upon fuel consumption in real traffic conditions, sum and difference characteristics of components of drive engine unitary power, area of maximal rise in overall engine efficiency after reduction of rotational speed, simplified SI engine performance maps, covering with economic zone of working point in energy-saving drive of vehicles are presented in the paper.
Źródło:: Journal of KONES; 2010, 17, 4; 547-552
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 4.

Tytuł:: Energy aspects of the SI engine load adjustment by early closing of inlet or exhaust valve
Autorzy:: Żmudka, Z.
Postrzednik, S.
Przybyła, G.
Powiązania:: https://bibliotekanauki.pl/articles/246087.pdf
Data publikacji:: 2016
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: spark-ignition engine
engine load
variable valve actuation
early valve closing
open theoretical cycle
Opis:: The theoretical analysis of the SI engine load adjustment has been presented. The load especially in SI engine is highly dependent on the process of charge exchange. This process has significant impact on the effectiveness of an engine work because it is connected with the necessity of overcoming the flow resistance, then with the necessity of doing a work, so-called the charge exchange work. The flow resistance caused by throttling valve is especially high during part load operation. The open theoretical cycle has been assumed as a model of processes proceeding in the engine. Using fully variable inlet and exhaust valves timing the cycle can be realized e.g. according to two systems: system with early inlet valve closing (EIVC) and system with early exhaust valve closing (EEVC). Both systems have been analysed individually and comparatively with the open Seiliger-Sabathe cycle, which is theoretical cycle for the classical throttle governing of an engine load. Benefits resulting from application of the systems with independent inlet and exhaust valves control have been assessed on the basis of the selected parameters: a fuel dose, a cycle work, a charge exchange work and a cycle efficiency. The use of the analysed systems to governing of the SI engine load will enable to eliminate a throttling valve from inlet system and reduce the charge exchange work, especially within the range of part load operation. Decrease of the charge exchange work leads to increase of the internal and effective works, which results in increase of the effective efficiency of the spark ignition engine. Additionally, the EEVC enables realization of the internal EGR.
Źródło:: Journal of KONES; 2016, 23, 4; 583-590
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Informacja

Wyszukujesz frazę "cycle load" wg kryterium: Temat

Źródło danych

Dostawca treści

Kolekcja

Rok wydania

Wydawca

Temat

Autor

Typ dokumentu

Język