Wszystkie pola: system simulation - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Analysis of the process of vehicle stopping with the use of emergency braking system
Autorzy:: Aleksandrowicz, P.
Powiązania:: https://bibliotekanauki.pl/articles/241747.pdf
Data publikacji:: 2016
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: braking
braking simulation
road traffic safety
Opis:: Road traffic poses high risk to human health and life and material objects. In an emergency situation, it is crucial for a driver to be able to reduce speed of the vehicle and pull up as quickly as possible. The braking distance of a vehicle depends on many factors including the surface condition and the braking system efficiency. During maintenance of a vehicle, the elements of a braking system undergo wear processes and failures. Therefore, producers equip vehicles with emergency braking systems, which can stop a car in the event of the main braking system failure. Cars in Poland are of diversified age therefore many different design solutions can be found. In this study, the problems connected with stopping a car in case of the brakes failure has been discussed according to the type of brake actuation system. Simulation calculations were performed with the use of computer tool V-SIM4, and the obtained results allow to find a braking design with the highest efficiency in terms of braking distance and maintenance of the vehicle direction in case of the main system failure. The research results make it possible to formulate a general conclusion that structures of emergency braking systems should be used in the following order: fully doubled, LL, HI whereas systems TT and X should be replaced by systems LL or possibly HI.
Źródło:: Journal of KONES; 2016, 23, 1; 9-15
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Simulational study of a hydraulicly driven parallel manipulator control system
Autorzy:: Frączek, J.
Wojtyra, M.
Dayliakos, I.
Papadopoulos, E.
Powiązania:: https://bibliotekanauki.pl/articles/243340.pdf
Data publikacji:: 2008
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: robotics
control
dynamics
simulation
parallel manipulators
inverse dynamics models
Opis:: A simulational model of 6 dof Stewart platform type parallel manipulator is presented. The manipulator is driven by electrohydraulic actuators. The developed control scheme employs the dynamic and hydraulic model of the system. The manipulator model consists of the rigid body equations of motion and the hydraulic dynamics of the main elements. Friction is included in the model. Two well-known software packages, one designed to perform control system simulation and the other dedicated to multibody simulation, are simultaneously used to conduct the study. The aim of the study is to check if it is the impact of dynamics model accuracy on the quality of control process. The simplifications of the model and the problems with finding accurate values of its parameters (especially friction parameters) are considered. The study helps to predict the possible results of inaccurate determination of the crucial model parameters. The simulation results show, that inverse dynamics model simplifications consisting in neglecting the mass of actuators have relatively little influence on the control quality. The effects of actuators masses neglecting can be reduced by appropriate changes in the modelled mass of the platform. The study shows that friction effects should be introduced to the inverse dynamics model and the friction parameters should be identified with possibly big accuracy. The parameters describing stiction-friction transition effects are the crucial ones.
Źródło:: Journal of KONES; 2008, 15, 1; 51-67
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: The design and simulation of an automated de-icing control system in the aircraft diamond DA42
Autorzy:: Gliwa, W.
Żyluk, A.
Grzesik, N.
Kuźma, K.
Powiązania:: https://bibliotekanauki.pl/articles/247354.pdf
Data publikacji:: 2018
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: anti-icing installation
icing
Diamond DA42
aircraft
general aviation
MATLAB
Opis:: The article discusses the automatic control system of the Diamond DA42 aircraft anti-icing system. In the analysis of the issue of icing, four parameters were taken into account: air temperature, cloud humidity, temperature of the aircraft and precipitation. On the basis of the initial parameters, the authors determined the icing intensity, which is likely to occur on the aircraft skin. By automating the activities related to the activation of the de-icing system, it is possible to significantly relieve the pilot and increase the safety of air operations, particularly in conditions, which are conducive to the formation of icing. The authors performed a thirty-minute electronic simulation of the flight in real atmospheric conditions. The article discusses the obtained results of the simulation. Designed system uses fuzzy logic. The system inputs and output were determined and fuzzy expert inference system was developed in MATLAB software and Fuzzy Logic Toolbox. The proper system work was verified with use of MATLAB/Simulink software. Use of that kind of systems can significantly relieve the pilot and increase the safety of air operations, particularly in conditions, which are conducive to the formation of icing.
Źródło:: Journal of KONES; 2018, 25, 4; 525-532
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Modelling and numerical simulation of the protectiye shield - protected plate - test stand system under blast shock wave
Autorzy:: Klasztorny, M.
Dziewulski, P.
Niezgoda, T.
Morka, A.
Powiązania:: https://bibliotekanauki.pl/articles/242616.pdf
Data publikacji:: 2010
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: light armoured vehicle
protective shield
aluminium-hybrid laminate-foam shield
blast shock wave
modelling and simulation
Opis:: The study presents FE modelling and simulation of a system for range testing of protective shields for light armoured vehicles. The protective shield designed by Authors is used against HE mines and IEDs up to 10 kg TNT. The system consists of the multiple-use portable rangę stand, a protected Armox 500T steel plate and a protective shield. The shield has a multi-layer structure and has the following main layers: PA11 aluminum, SCACS hybrid laminate, ALPORAS aluminum foam, SCACS hybrid laminate, connected together using SOUDASEAL chemo-set glue. The HE spherical charge is suspended centrally at 400 mm distance from the top surface of the stand. Overall dimensions of the test stand are approximately 800x800x180 mm, the protected piąte has dimensions 650x650x5 mm, and the protective shield is of 450x450x76 mm dimensions. The system is supported by an additional steel plate stiffening the subsoil. FE modelling, numerical simulations and processing the results were performed for the system under blast shock wave using the following CAE systems: CATIA, HyperMesh, LS-Dyna, and LS-PrePost. The 8-nodes brick finite elements were used, taking into account friction and contact phenomena. Isotropic and orthotropic material models and advanced nonlinear equations-of-state for some parts of the system were chosen, with relevant failure and erosion criteria, including the Johnson — Cook model for Armox 500T steel and PA11 aluminum and the MAT 161 model for plies of hybrid laminates. The shock wave was modelled approximately using the LOAD BLAST ENHANCED option available in LS-Dyna Version 971 R4 Beta code. Numerical simulations were performed for 2 kg TNT.
Źródło:: Journal of KONES; 2010, 17, 3; 197-204
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Simulation model of the means of transport maintenance process
Autorzy:: Landowski, B.
Powiązania:: https://bibliotekanauki.pl/articles/247753.pdf
Data publikacji:: 2010
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: modelling
operation and maintenance process
transport system
urban public transport
computer simulation
Opis:: The real operation and maintenance processes of technical objects are characterised by so called secondary action, it means that the values of the features describing the process states and the analysed operation and maintenance states of technical objects as well as the after-effect ofthose states depend not only on their present state, but very often on the state or sequence of the previous states, too. In spite of the fact that the mathematical models of the real processes are intrinsically a significant simplification of the actual state, it however seems that omission of a secondary action in a certain class of operation and maintenance processes is an excessive simplification and the results obtained from investigations of models of that type may be affected by a significant error. The paper presents a model of operation and maintenance process of means of transport characterised by a secondary action as well as an example of computer simulation of performance of a stochastic process describing the features of the operation and maintenance process under analysis. The elaborated model of operation and maintenance process of technical objects takes into account the specificity of the systems of the urban bus transport. The computer simulation of the maintenance process enables, among other things, to estimate the values of the chosen indicators characterising the investigated process. On the basis of the analysis of the statistical data, obtained from the operation and maintenance investigations, the values of the essential input parameters of the model were estimated. The considerations presented in the paper include an assumption that it is possible to distinguish n disjoint subsets ofhomogenous objects, from the point of view of the investigation purpose, in the set of the technical objects being operated and maintained in the system under analysis. The investigation object is a system of operation and maintenance of means of transport.
Źródło:: Journal of KONES; 2010, 17, 4; 271-276
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Simulation of the hybrid propulsion system for the small unmanned vehicle
Autorzy:: Polak, F.
Walentynowicz, J.
Powiązania:: https://bibliotekanauki.pl/articles/244497.pdf
Data publikacji:: 2011
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: unmanned vehicle
hybrid propulsion system
Opis:: The paper presents a simulation model of an unmanned vehicle propulsion system designed and constructed at the Laboratory of Internal Combustion Engines WAT. The vehicle was modelled in the software environment AMESim. It is intended as a tool for modelling of mechatronic systems, and therefore it was possible to create a link between mechanical parameters such as gears, with elements from the fields of electrical engineering and electronics, such as electric motors and inverters. Presented undercarriage system modelled the platform with 6x6 and independent drive wheels. Presented model of the hybrid structure of a small unmanned vehicle and sub models driver module and the propulsion module battery charging electric current through a combustion engine (generator controls, the switching of electric current battery capacity following a drop below the desired value - for this calculation was 50% of battery capacity). Characteristics of parameters changes of sets are presented. Simulation study for two batteries of different capacities as an example of the synthetic driving test and analyzed the differences between the foundation and set of characteristics. It was found that the higher-capacity battery could provide a better change of speed.
Źródło:: Journal of KONES; 2011, 18, 1; 471-478
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Sensitivity analysis of steering system model
Autorzy:: Żardecki, D.
Powiązania:: https://bibliotekanauki.pl/articles/242406.pdf
Data publikacji:: 2009
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: car
steering system
piecewise linear model
simulation
sensitivity analysis
friction
freeplay
stick-slip
Opis:: The method of sensitivity analysis of mathematical model with strong non-linear characteristics is discussed in the paper. This model focuses on friction, as well as freeplay dynamics in a car steering system including stick-slip fenomena. Because of strong nonlinearities of the model, its sensitivity indexes can not be counted by classic sensitivity variation equations and classic mathematical analysis of smooth functions. Fortunately, nonlinear characteristics are described with using special piecewise - linear luz(...) and tar(...) projections. They have an original mathematical apparatus which secures parametrically made simplifications and enough regularity of the model (some details of analytical transformations are shown). Thanks to luz(...) and tar(...) projections the continuity of sensitivity indexes is secured but of course, the calculation of sensitivity indexes has to base on comparative simulation investigations. The paper presents example results of simulations of the steering system action (including stick-slip processes) for different values of friction as well as freeplay parameters (kinetic and static friction in king-pins, backlash in a steering gear). These simulations concern combined open road tests of a passenger car according to the ISO requirements (ISO 7401 - the ramp input on the steering wheel, then ISO 4138 - circular steady state motion, and finally the steering wheel released, all with a constant speed 80 km/h).
Źródło:: Journal of KONES; 2009, 16, 1; 571-581
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Simulation of the work of a spark-ignition engine with a dual-injector fuel system
Autorzy:: Sendyka, B.
Noga, M.
Powiązania:: https://bibliotekanauki.pl/articles/246079.pdf
Data publikacji:: 2010
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: dual-injector fuel system
direct injection
port injection
combustion
spark-ignition engine
modelling
simulation
KIVA-3V
Opis:: This paper is about computer modelling of a four-stroke spark-ignition engine with a dual-injector system. Using a KIVA-3V program for Linux, computer simulations were performed for one of the cylinders fuelled by multipoint injection and by the dual-injector system, i. e. with direct injection into the cylinders on top of MPI. The modelling was done for a combustion engine Toyota 2SZ-FE with a dual-injector system. Both simulations were done for the same parameters of engine's work, i.e. at the same RPM of 2000 and the intake pipe pressure of 0.079 MPa. KIVA-3V program models the processes taking place in an internat combustion engine while taking into account physical and chemical phenomena occurring during the formation of a charge and during its combustion. Using a stochastic model of injection the program takes into account the movement of droplets and their dispersion. The results of the simulation show that the dual-injector system has an improved volumetric coefficient, i.e. improved engine performance. An increase in the engine's indicated pressure was also observed; this increases the engine's total efficiency. The intensification of the charge's angular momentum in a cylinder with a dual-injector system can explain the improvements in the course of combustion process. Because the air-fuel mixture was already partially formed in the engine there was a small increase in the unburned hydrocarbons in the cylinder. However, a marked drop in the carbon monoxide and nitric oxide were observed for the dual-injector system. Analyzing the overall results of the simulations one can ascertain a positive impact of using a dual-injector system on the working parameters of a spark-ignition engine.
Źródło:: Journal of KONES; 2010, 17, 1; 399-410
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Kinematic simulation and numerical analysis of the suspension system of light wheeled vehicle
Autorzy:: Różyło, P.
Powiązania:: https://bibliotekanauki.pl/articles/243731.pdf
Data publikacji:: 2014
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: finite element method
kinematic simulation
suspension
light wheeled vehicles
numerical analysis
Opis:: The paper presents the process of kinematic simulation and FEM numerical analysis of the suspension system of the light-wheeled vehicle. Fragment of the suspension system is a set of simple vibration damping mechanisms occurring in light-wheeled vehicles. The materials used for analysis is aluminum, steel and rubber characterized by properties hyperplastic. The suspension system has been subjected to the force generated from the substrate, resulting from the prevailing inequality terrain. Kinematic simulation made using CAD software enabled the mapping of the actual behaviour of the suspension with a simple steering mechanism, while passing at the characteristic curvilinear track. Numerical investigations have enabled the analysis of stress distribution in the structural elements while pointing out areas with the highest levels of stress reduced, designated by HMH hypothesis (Huber-Mises-Hencky). The FEM analysis used local and global density of the mesh through which highlighted the level of maximum stress concentration. Result of reduced stress distribution shown exactly on the complete form of the test model of a wheeled vehicle suspension. In the analysis of numerical models have been used elasto-plastic materials and hyperplastic available in the Abaqus. Calculations were carried out taking into account the issues of using geometrically nonlinear Newton-Raphson method.
Źródło:: Journal of KONES; 2014, 21, 1; 241-247
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: An analog-digital hydraulic cylinder velocity control system for mobile machines
Autorzy:: Czyrek, J.
Pobędza, J.
Powiązania:: https://bibliotekanauki.pl/articles/244932.pdf
Data publikacji:: 2014
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: transport
simulation
control system
mobile machine
hydraulic cylinder
PID controller
Opis:: Hydrostatic drive systems with linear actuators are commonly used in variety of mobile machines and vehicles. One of important aspect of its operation is cylinder velocity control in variable operating conditions, such as different load, pump pressure and engine rotational velocity. The aim of this article is to create an algorithm, which would control velocity of a hydraulic cylinder used in such systems. One way to create cylinder velocity control system is to perform an identification, which would characterize this system. To do this work it was appropriate to use test stand with excavator equipment. The first part of the article includes the description of the stand and enumerates parts that compose it. Correct work of the control system is possible through use of a proper controller. For achieving a desired purpose, a PID controller was used with some modifications improving system's operation. The controller parameters were tuned based on the model of the system, obtained on the basis of estimation, for different operational conditions. To do this, a tool of MATLAB Simulink called Parameter Estimation was used. The control algorithm, in automatic mode, makes system tuning based on coefficients array. The final stage of the research work was to conduct verification tests, which let to assess a correctness of the created and proposed control system.
Źródło:: Journal of KONES; 2014, 21, 3; 59-66
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: Simulation of work of an engine working with combustion initiation from ignition dose of fuel
Autorzy:: Sendyka, B.
Mitianiec, W.
Noga, M.
Powiązania:: https://bibliotekanauki.pl/articles/245989.pdf
Data publikacji:: 2011
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: modelling
simulation
combustion engine
HCCI
two stage injection system
Opis:: The paper presents analysis of fuelling and of the course of combustion process for a two-cycle engine. The main idea of the engine according to patent solution of Prof. B. Sendyka consists in the fact that engine work begins from spark ignition, whereas, at higher load and higher temperature in the cooling system there occurs switching off spark ignition and transition to ignition from an ignition dose injected directly into the combustion chamber. Such an engine possesses two injection systems: one system of multi-point injection which forms homogenous mixture, whereas, the other system of direct injection is used for ignition dose injection only. After injection of the ignition dose of a very small mass combustion is initiated on the basis of formation of auto-ignition centres so as it takes place during knock combustion. Auto-ignition centres initiate combustion of the basic charge. Simulation was carried out in order to perform analysis occurring phenomena of fuel feeding and combustion. Works on it started from elaboration of a computational grid of the engine and subsequently analysis of indicated diagrams of engine work with injection of ignition dose was performed. Analysis was also performed of temperature traces and of traces of charge mass change in the cylinder as well as of participation of the mass of basic fuel dose in the cylinder in function of the crank angle. Moreover visualization of effects of the process of mixture formation and combustion was performed and presented in form of illustrations of charge temperature distribution, fraction of fuel ignition and basic dose vapours in cross-sections of the combustion chamber.
Źródło:: Journal of KONES; 2011, 18, 3; 395-403
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:: Chosen aspects of simulation model to designing pro-ecological transport system
Autorzy:: Wasiak, M.
Kłodawski, M.
Lewczuk, K.
Jachimowski, R.
Szczepański, E.
Powiązania:: https://bibliotekanauki.pl/articles/247358.pdf
Data publikacji:: 2014
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: pro-ecological transport system
PTV VISUM
EMITRANSYS
transport system modelling
Opis:: Paper presents simulation model of pro-ecological transport system (PTS). Model allows computational experimentation and inference on transport modal split and emission of pollution in a national scale. The characteristics describing infrastructure, vehicles, and harmful compounds emission are given. Model is implemented in VISUM – a tool supporting planning of transport processes as well as analysis and designing of transport systems. The demand for transport services and emission of exhaust gases components are reflected in model of pro-ecological transport system of Poland. In particularly, Representation of model of pro-ecological transport system, transport sub-systems and segments of demand in freight transport in simulation model of PST, detailed assumptions of onboard measurements for Mercedes C200, detailed results of on-board measurements of pollutants, CO2 emission in function of instantaneous velocity and acceleration, representation of pollutants emitted by freight transport in Poland, as well general assumptions for designing simulation model of pro-ecological transport system and material and passenger flows distribution and the pollution emission are presented in the paper.
Źródło:: Journal of KONES; 2014, 21, 4; 525-532
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 13.

Tytuł:: Influence of freeplay and friction in steering system on double lane change manoeuvre - modelling and simulation studies
Autorzy:: Więckowski, D.
Żardecki, D.
Powiązania:: https://bibliotekanauki.pl/articles/242049.pdf
Data publikacji:: 2011
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: vehicle dynamics
steering system
freeplay
friction
mathematical models
luz(...) and tar(...) projections
simulation studies
sensitivity analysis
optimization of maneuver
double lane change maneuver
Opis:: Modelling and simulation investigations of a car non-linear dynamics with regard to freeplay (backlash in steering gear) and friction (kinetic and static friction in king-pins) is always a challenge for researchers. Fortunately, by special luz(...) and tar(...) projections and their mathematical apparatus the elaborated models and simulation procedures of stick-slip phenomena in a steering system are managed in efficient forms (without any entangle constraints) even for optimization and sensitivity studies. Exactly, the presented studies deal with problems of sensitivity of optimized maneuvers for vehicle models considering freeplay / friction effects. Double lane change maneuvers (overtaking and avoiding) are discussed. A criterion function refers to several evaluations (precision of maneuver, calm steering, feeling of comfortable travel). The optimization of steering wheel angle signal is done on a reference model with "nominal" freeplay and friction parameters. Such input signal is applied to a "real" vehicle having "real" freeplay and friction parameters. The differences of output signals as well as differences between criterion function values are a subject of sensitivity analysis. The sensitivity of reference models on a variation of freeplay and friction parameters appears as important from theoretical as well as practical points of view. The paper takes up the problems of sensitivity analysis of steering system model applied for synthesis steering algorithms for a double lane change maneuver.
Źródło:: Journal of KONES; 2011, 18, 2; 483-492
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 14.

Tytuł:: A computational fluid flow analysis of a disc valve system
Autorzy:: Czop, P.
Śliwa, P.
Gniłka, J.
Gąsiorek, D.
Wszołek, G.
Powiązania:: https://bibliotekanauki.pl/articles/244640.pdf
Data publikacji:: 2011
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: valve system
computational fluid flow analysis
simulation
Opis:: Noise concerns in shock absorbers can be divided into two categories. The first is fluid flow noise, or “swish noise”, caused by the oil being forced through openings in the valves. The type and temperature of the oil, its velocity and the orifice geometry all have an effect on this. In addition, the structural design of the shock absorber shell may either reduce or amplify the noise. The second type of shock absorber noise is often described as regular operational noise or “chuckle noise”. It can be observed in vehicles during low-displacement, higher-frequency events, such as driving over a slightly rough road. This effect measurable as a force discontinuity into the vehicle and can come from a number of sources in the shock absorber, e.g. hydraulic transitions. It is often traceable to the valve discs closing and opening, but can also be caused by cavitation/aeration in the oil and air being pulled through the valves. The work on noise improvement reported in this paper has been started using conventional shock absorbers to be extended and will cover in the future variable damping shock systems as well. The paper gives an overview about the configurations of a typical valve system including three basic regimes of operation, which correspond to the amount of oil flowing through a valve cavity. The aim of this work was to propose a finite element fluid flow model, which can be used in order to reduce the velocity of fluid flow through a cavity of a shock absorber valve. High flow velocity can cause high-content frequency vibrations and, in turn, audible noise. The model will be used for initial screening of new valve concepts and on the other hand to improve the currently use ones.
Źródło:: Journal of KONES; 2011, 18, 1; 117-122
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 15.

Tytuł:: Simulation analysis of the effect of inlet pipe diameter on the cylinder filling of compression-ignition engine
Autorzy:: Lisowski, M.
Powiązania:: https://bibliotekanauki.pl/articles/247788.pdf
Data publikacji:: 2010
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: inlet pipe diameter
in-cylinder mass
numerical model
inlet system
simulation
combustion engines
Opis:: In this paper are presented the basic problems accompanying the flow of charge through compression-ignition engine inlet system. The flow of medium through inlet pipe to cylinder was assumed to be one-dimensional and described with mass, momentum and angular momentum conservation eąuations and energy consLrvation law. On the other hand, a zero-dimensional model described by mass-energy conservation equations was used to determine parameters of the medium in total cylinder volume. Simulations were carried out with the use of numerical programme in which McCormack's explicit method was applied to solve differential equations describing the flow of charge in inlet system. The McCormack explicit technique was used due to the fact that an earlier attempt at solving a numerical problem with the method of lines had not yielded desired effects in view of high instability. Simulation aimed at determining the mass of air remaining in engine cylinder after inlet valve closure. Simulation results are presented in the form of in-cylinder air mass versus crank angle characteristics for different inlet pipe diameters. The study results are also presented in the form of a summary table and a summary diagram, the latter enabling a comparison of results for different inlet pipe diameters.
Źródło:: Journal of KONES; 2010, 17, 4; 295-302
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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