Autor: Wysocki, W. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Experimental verification of numerical test results for a double multi- leaf spring
Autorzy:: Krasoń, W.
Wysocki, J.
Powiązania:: https://bibliotekanauki.pl/articles/242087.pdf
Data publikacji:: 2009
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: experimental verification
FEM
numerical models
double multi-leaf spring
suspension of a motor truck
Opis:: A double spring used in the vehicle suspension, as a combination of spring elements of characteristics close to linear ones, actually provides non-linear suspension characteristics. Due to requirements for the truck suspension being designed, the spring characteristics in the whole range of load changes should meet the vehicle motion smoothness related to keeping the frequency of own suspension vibrations within a range of l-2 Hz [8, l0]. A prototype double spring made of a four-leaf main spring and two- leaf auxiliary spring (Fig. 1) makes a subject of considerations. Characteristic features of that structural solution includes a clearance between the main spring and the auxiliary spring. This work presents the results of numerical tests for three models of MES double spring [23] that were compared with experimental test results. An evaluation of usability of individual numerical models was made for representation of a double spring characteristics, contact between individual leaves and regular stress in the main leaf (the so-called safety leaf). The smallest differences between the stress results obtained from numerical tests compared to the laboratory tests, for the beam and shell models, have been obtained only for one extreme main (longest) leaf.
Źródło:: Journal of KONES; 2009, 16, 3; 185-193
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Analysis of vibrations of the simplified model of the suspension system with a double spring and a fluid damper
Autorzy:: Krasoń, W.
Wysocki, J.
Powiązania:: https://bibliotekanauki.pl/articles/244562.pdf
Data publikacji:: 2011
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: FEM
numerical models
double multi-leaf spring
suspension of a motor truck
viscous damper
Opis:: The subject of the paper are forced vibrations of the rear suspension of the biaxial vehicle fitted with the double spring spatial shell model and the viscous damper, under the force pulse input with the given transient response. The play between the master and auxiliary spring is a specific feature of the double spring design [1, 6]. Numerical tests were taken for three variants of the viscous attenuation. The attenuation coefficient values for typical dependent suspensions and their range of changes were assumed on the basis of publication [14]. The problem of modelling and analysing, including contact issues, was solved with the use of the MSC Software programme package with the special use of MSC Patran pre-processor [12]. The numerical analysis of the suspension model with the geometrical nonlinearities, viscous attenuation, and time-varying load was taken with the use of the finite element method (FEM). The selected results of the model tests in the form of the suspension relative displacements (speeds) and deformations (stresses) for the selected points of the master and auxiliary spring against time are presented in the paper. The complete model of the suspension system makes possible to examine the influence of various inputs on the interoperation and the phenomena associated with the dynamic response of such a complex system.
Źródło:: Journal of KONES; 2011, 18, 1; 311-316
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: A numerical analysis of a double multi-leaf spring model
Autorzy:: Wysocki, J.
Krasoń, W.
Powiązania:: https://bibliotekanauki.pl/articles/245995.pdf
Data publikacji:: 2009
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: FEM
numerical models
double multi-leaf spring
suspension of a motor truck
Opis:: The use of a double spring in a vehicle suspension as a combination of elastic components of characteristics which are approximate to linear ones gives a nonlinear suspension nature, which should approximately meet the criterion of car motion smoothness connected with keeping the frequency of the free vibrations of the a motorcar body in the range of l - 2 Hz, in the whole range of load changes (cargo) [see references 8, 10]. The subject of considerations is a prototypical double spring that consists of a four-leaf main spring and a two-leaf auxiliary spring and is meant for the family of motor trucks (delivery trucks) of a total mass of about 3,51. The presence of a clearance between the main spring and the auxiliary spring is the specificity of the aforementioned structural solution. In the present study, there are presented different variants of FEM numericał models ofa double spring as well as selected aspects of their applications at the stage of the research on the displacements and deformations of selected structural components. The structures ofa two-dimensional beam model, a three-dimensional shell model and a solid model of a double spring are discussed. Moreover, the study discusses different approaches in the modelling of the effect of contact between particular leaves and their influence on analysis results. Selected model tests results were compared with experimental research results.
Źródło:: Journal of KONES; 2009, 16, 1; 541-550
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: The research on the double spring effort in braking process
Autorzy:: Krasoń, W.
Wysocki, J.
Powiązania:: https://bibliotekanauki.pl/articles/247773.pdf
Data publikacji:: 2010
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: FEM
numerical models
double multi-leaf spring
truck suspension
load in braking process
Opis:: A prototype double spring, consisting of the main four-leaf spring and the auxiliary two-leaf spring, designed for a truck (van) vehicles of a gross weight ofapp. 3,5 tons, makes the subject of considerations. This structural design is characterized by a clearance between the main and the auxiliary springs. The main objective of this work is to define the double spring strain during intense vehicle braking. A spatial FE shell double spring model has been proposed and it has been used for effort and deformation research on its selected elements, at combined load (vertical, horizontal forces and braking moment). Numerical tests have been performed within the quasistatic operation loads. The numerical analysis using those loads allows evaluating the braking force impact on the double spring operation and cooperation of the main and auxiliary spring leaves. Modelling and analysis issue, including contact issue, have been sohed by means of the software package for engineering computation by MSC. Software. Results obtained from simulations allow evaluating the deformation of individual leaves of the double spring, stress concentration areas and preliminary identification of the suspension (drive axle) kinematics, particularly to define axis trajectory of the wheel. Selected numerical test results have been compared to the experimental test results.
Źródło:: Journal of KONES; 2010, 17, 4; 237-244
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Numerical studies of suspension system with double spring loaded using the force pulse
Autorzy:: Krason, W.
Wysocki, J.
Powiązania:: https://bibliotekanauki.pl/articles/244918.pdf
Data publikacji:: 2018
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: dependent motor truck suspension
double multi-leaf spring
viscous damper
numerical analysis
FEM
zależne zawieszenie samochodu silnikowego
podwójna sprężyna wielopłatowa
lepka przepustnica
analiza numeryczna
MES
Opis:: The forced vibration of a dependent rear suspension model of the two-axle vehicle, equipped with a 3D model of a double spring and a viscous shock absorber is the subject of consideration. The clearance between the master and auxiliary springs is a specificity of the double suspension construction. Dynamic analysis of such a system has been performed by forcing with different forms of force pulses using the fixed base of force 10 kN. Three different time runs (two trapezoidal and one triangular model) are used as the force impulses. Modelling and analysis taking into consideration contact problems have been developed using the MSC.Software package with a special use of Patran pre-processor and Nastran solver. A finite element method (FEM) has been used in numerical analysis of the suspension model with geometric nonlinearities, viscous damping [9] and time-varying load. The boundary conditions of numerical models correspond to a spring support in the real vehicle suspension. The non-periodic damped vibrations and damped free vibrations of the simplified suspension system are investigated during numerical analysis. Selected results of the model tests have been presented in the form of the timings of the accelerations of the spring elements and of the forces in the suspension damper.
Źródło:: Journal of KONES; 2018, 25, 1; 241-248
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Numerical tests of the double spring with hangers
Autorzy:: Krasoń, W.
Wysocki, J.
Zając, K.
Powiązania:: https://bibliotekanauki.pl/articles/245670.pdf
Data publikacji:: 2015
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: double multi-leaf spring
suspension of a motor truck
stand test
vertical load
1D FE models
3D FE models
Opis:: Subject of the work include selected numerical models of the test stand intended for testing a prototype double multi-leaf spring of bi-linear nature. Basic design assumptions of the stand were as follows: provide laboratory tests of multi-leaf (single and double) springs designed for dependent suspensions of passenger cars of permissible weight up to 3,5 tones. The stand should allow for testing basic spring and strength characteristics in the quasi-static conditions and dynamic conditions with the impact of the force impulse or a set variable load characterized by a particular force amplitude (displacement) and frequency of its variations. Considered stand models include the tested spring, base, support and the hanger. This paper presents two types of FEM models of the spring element (beam and 3D). In the first element, components of the spring-hanger system were mapped by means of beam elements, in the second one by means of definite solid elements. The spring was loaded with a vertical force from 0 to 10000 N. A non-linear analysis of the bi-linear spring was carried out including clearance as well as the elastic analysis of the stand. The results of the numerical tests are presented in a form of tabular specifications, diagrams of displacements, and reduced stresses of selected components of the stand.
Źródło:: Journal of KONES; 2015, 22, 4; 163-170
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Experimental investigations of double multi - leaf spring subjected to impact load
Autorzy:: Bogusz, P.
Krasoń, W.
Wysocki, J.
Powiązania:: https://bibliotekanauki.pl/articles/247312.pdf
Data publikacji:: 2012
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: double multi-leaf spring
suspension of a motor truck
impact load
experimental investigations
Opis:: The article deals with experimental investigations of a prototype double multi-leaf spring, compound of a fourleaf main spring and a double-leaf supporting spring subjected to an impact test. In real conditions of car movement (e.g. curb, bump), dynamic oscillating loads, which generate dynamic stress in a car suspension affecting other elements of the car, occur. Consequently, effects of coupled oscillations having a great impact on comfort of a driver and passengers can be observed. The research was conducted in the Laboratory of Material and Construction Strength Department of Mechanics and Applied Computer Science (DMACS) in the Faculty of Mechanical Engineering of Military University of Technology. The experiment was carried out on an original construction of a spring impact hammer developed in DMACS. Energy of the impact was set up by changing mass of a beam with beater and beam dropping height. The results were presented in the form of table summaries, time-dependent load and displacement graphs. The methodology of the research presented in the paper and a set of measuring equipment can be utilized to evaluate load and vibrations of any multi-leaf spring under impact load with given energy. The experimental results obtained from the test are supposed to be used to verify and develop FEM model describing a spring under impact load and oscillations.
Źródło:: Journal of KONES; 2012, 19, 2; 45-51
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Numerical and experimental research on the dynamic loads in military vehicles
Autorzy:: Rybak, P.
Borkowski, W.
Wysocki, J.
Powiązania:: https://bibliotekanauki.pl/articles/949498.pdf
Data publikacji:: 2016
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: military vehicle
armoured vehicle
load
research
modelling
experiment
Opis:: The work presents the fragments of research on the dynamic loads acting on selected military vehicles. Designing new armoured vehicles or introducing modifications is preceded by model tests carried out under various conditions, analysing the effect of dynamic loads which may result during the use of the vehicle, e.g. due to the roughness of the road, firing, IED explosions or the vehicle being hit by a shell. The main purpose of conducting model research and verifying their findings in experimental research is to improve the effectiveness and safety of operation of systems and installations of military vehicles, increase the dynamics of the movement, improve the protection and ensure that the crew is not killed. Among the used models of military vehicles, discrete models are applied, formulated in the adjusted Lagrange description, as well as the models based on the fine element method for highly nonlinear problems and forces acting for a very short time. Due to the unique selection of military equipment, the methods of calculation and analysis of model research (simulations) and experimental research presented in the work are considered qualitative rather than quantitative.
Źródło:: Journal of KONES; 2016, 23, 4; 435-441
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Testing the results of a passenger vehicle collision with a rigid barrier
Autorzy:: Borkowski, W.
Hryciów, Z.
Rybak, P.
Wysocki, J.
Powiązania:: https://bibliotekanauki.pl/articles/245925.pdf
Data publikacji:: 2010
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: road safety barrier
crash tests
computer simulation
LS-DYNA
Opis:: High accident index in Poland, including one of the highest death rates in EU, forces undertaking the intense works in order to improve traffic safety. Published road accident statistics indicate that the most dangerous accidents include a vehicle collision with a tree, post or other road object. The road safety barriers make the road infrastructure elements that can signiflcantly protect against that type of accidents. The work presents basie tasks and requirements imposed on the barriers. Problems related to a proper selection of the barriers have been also highlighted. The tools facilitating the barrier design include numerical modelling. The modelling has been done by means of the LS-DYNA software, using the finite element method. A general structure and a developed barrier model as well as vehicle model have been presented. The conditions of the numerical tests have been also specifled. The work presents the results of influence of car impact angle with a rigid safety barrier. Presented results refer to a car o f mas s of 900 kg, making a bas is for the tests of the limiting systems for several limiting levels: including normal limit N2 (according to EN 1317-2). Compared to standard requirements, the scope of numerical tests has been extended by other car impact angle values. The work presents vehicle trajectories and deformations of their bodies. It also includes examples of velocities and acceleration courses and acceleration severity indexes (ASI) calculated on their basis. Obtained results indicate that the barrier location angle has a high influence on the safety level ofthe car passengers as well as on the car motion trajectory after collision
Źródło:: Journal of KONES; 2010, 17, 1; 51-57
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Simulation tests on shaping the working width of the concrete protective systems
Autorzy:: Borkowski, W.
Hryciów, Z.
Rybak, P.
Wysocki, J.
Powiązania:: https://bibliotekanauki.pl/articles/247035.pdf
Data publikacji:: 2010
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Opis:: The work addresses the road traffic safety issue related to the use of road safety barriers. It describes the tasks that have to be fulfilled by the protective system. It presents the barrier assessment conditions according to the requirements ofthe existing standards as far as the working barrier width is concerned. The objective of the work is to evaluate the possibilities of shaping the working width of the concrete protective systems. They have been executed on the basis of a concrete barrier equipped with a prototype joint linking individual barrier segments. It allowed defining the maximum angle of relative angle displacement of the adjacent segments. The model tests have been performed with a 900kg passenger car which allows performing TB11 test according to EN1317-2 standard The modelling has been performed with LS-DYNA software, which uses the finite element method. The work presents the numerical test results, vehicle motion trajectory and barrier displacement. It also includes examples of speed and acceleration courses of selected vehicle elements and the ASI index calculated on that basis which is used to assess the danger level for the vehicle passengers. Obtained results indicate that there is a possibility of shaping the dynamic bending and the working barrier width depending on assumed joint (boundary angle) parameters. Further areas of the analysis have been also defined.
Źródło:: Journal of KONES; 2010, 17, 2; 43-50
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: Experimental crash tests involving passenger cars and the prototype concrete protective barrier
Autorzy:: Borkowski, W.
Hryciów, Z.
Rybak, P.
Wysocki, J.
Powiązania:: https://bibliotekanauki.pl/articles/247037.pdf
Data publikacji:: 2010
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: experimental tests
test track
concrete protective barrier
crash test
experimental verification
Opis:: The work describes the experimental test methodology and results obtained during the experimental crash tests involving passenger cars and the prototype concrete protective barrier, which was built according to the original design prepared by the authors of this article. The crash tests involving a vehicle and the protective barrier cover the experiment results in three basic areas: severity ofthe collision impact on vehicle passengers, the impact on a vehicle and deformation of the road protective system. Applied testing procedures meet the requirements of the national standards, that make the equivalents of the European standards EN-1317-1:1998, EN-1317-2:1998, EN-J 317-3:2000. The tests have been performed for selected crash criteria (TB11 and TB32), for a normal restrain level (N2), using three passenger's cars (Dodge Neon and 2 units of Suzuki Swift). Applied testing procedures meet the requirements of the national standards [1-5]. The work presents examples of experimental test results in three basie areas: intensity of the crash impact on the vehicle passengers, the impact on a vehicle and deformation of the road protective system. The test results have been presented in a form of courses of speeds and accelerations along the vehicle body axes x, y, z. Acceleration severity index (ASI), theoretical head impact velocity (THIV), post-impact head delay (PHD), vehicle cabin deformation index (VCDI) and deformation levels of the road protective system (W) have been also defined.
Źródło:: Journal of KONES; 2010, 17, 2; 35-42
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:: Numerical simulation of the standard TB11 and TB32 tests for a concrete safety barrier
Autorzy:: Borkowski, W.
Hryciów, Z.
Rybak, P.
Wysocki, J.
Powiązania:: https://bibliotekanauki.pl/articles/247654.pdf
Data publikacji:: 2010
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: road safety barrier
crash tests
computer simulation
LS-DYNA
Opis:: The work presents the traffic safety issue related to a use of the road protective barriers. It describes a purpose and tasks that should be fulfilled by the safety system. Conditions of crash tests and their evaluation according to the requirements of the existing standard documents are also presented. The purpose of the work was to evaluate the influence of applied barrier type on the car collision process. A barrier composed of the segments that can move on the ground due to the impact force and a barrier fixed to the road surface were assumed for the model tests. The modelling was carried out by means of the LS-DYNA sofrware, using the finite element method. The tests were performed for two types of cars, mass of 900 kg and 1500 kg. The work includes the numerical test results, deformations of car bodies and barrier displacement. Examples of velocities and acceleration courses of selected vehicle elements and the ASI index, calculated on their basis, used for evaluation of the passenger danger level were also presented. Obtained results indicate a significant influence of the barrier installation method (joint with the road) on the collision process course and dynamic loads affecting the car passengers. They also indicate directions of safety improvement.
Źródło:: Journal of KONES; 2010, 17, 4; 63-71
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 13.

Tytuł:: Studies on possibilities of increasing the impact resistance of KTO Rosomak
Autorzy:: Borkowski, W.
Rybak, P.
Hryciów, Z.
Wysocki, J.
Powiązania:: https://bibliotekanauki.pl/articles/241711.pdf
Data publikacji:: 2012
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: wheeled armoured carrier
loads
mine explosion
Opis:: Military vehicles are mostly designed in order to provide effective execution of tasks in regions of expected actions and operation conditions. During execution of projects, resulting from participation in peace making and stabilization missions, military vehicles are subject to the impact of various mines and improvised explosives. In many cases, the explosive material mass included in the explosive charges affecting the vehicles significantly exceeds the values specified in standards defining the required protection levels assumed at the design stage. The above determines the search for additional shields or energy-absorbing elements reducing the effects of such influence. Information concerning design solutions is usually classified or very limited. Majority of companies dealing with that issue provides information concerning the scope of their business, highlighting the military area thus high efficiency of their protective solutions, possibly presenting a general outline of a particular solution. This paper presents selected results of analyses and studies being carried out and obtained results of solutions to problems included in the study tasks covering a considered subject. Proposed solutions of protective shields against mines and IED for the KTO Rosomak are presented.
Źródło:: Journal of KONES; 2012, 19, 4; 101-110
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 14.

Tytuł:: Influence of the shape of the explosive charge on blast profile
Autorzy:: Hryciów, Z.
Borkowski, W.
Rybak, P.
Wysocki, Z.
Powiązania:: https://bibliotekanauki.pl/articles/247727.pdf
Data publikacji:: 2014
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: cylindrical and rectangular charge
blast overpressure
blast impulse
LS-DYNA
ALE
Opis:: When an explosive charge is fired, the nature and mass of the explosive are the only parameters of importance usually considered. The shape however, also plays a major role in the effect of an explosive charge. Knowledge of shape effect can be important before the use of the explosive (in order to create a maximum effect with a given mass of explosive), or in post-explosion damage assessment. The shape effect however is only significant within a certain range from the charge. At longer distance, the produced blast wave tends to be spherical. The shock wave parameters studied in this work are the peak overpressure and the first positive impulse. A series of numerical test has been performed in order to determine the range of influence of the charge shape. Different locations of initiation were compared. A hemispherical charge was point detonated at its centre whereas a cylindrical shape was detonated at the centre of an upper or lower plane. Numerical simulations of near field burst were conducted using LS-DYNA software. During numerical tests a pressure fields were determined for different shapes of explosive charges as well as the pressure waveforms at points located 1000 mm from a centre. Additionally, reference pressure history curves from LOAD_BLAST_ENHANCED procedure were calculated.
Źródło:: Journal of KONES; 2014, 21, 4; 169-176
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 15.

Tytuł:: Prototype articulated joint in connections of the concrete protective barrier
Autorzy:: Borkowski, W.
Hryciów, Z.
Rybak, P.
Wysocki, J.
Powiązania:: https://bibliotekanauki.pl/articles/244656.pdf
Data publikacji:: 2011
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: transport
road safety
concrete protective barrier
crash test
articulated joint
Opis:: The work describes methodology of selection of a prototype articulated joint used to connect the segments of the concrete protection barrier. The barrier and the joint have been made according to the original project of the authors of this paper. Dimensions of the component elements of the joint were defined on the basis of numerical calculations in LS-DYNA system, using finite element method. They also allowed to identify places sensible to damage. Based on the project, the experimental tests have been performed for the joint strength to stretching. The tests performed on the resistance machine showed improper technology and poor quality of welds joining individual elements, particularly the bolt with connecting steel. Results of these tests made the basis for introducing the changes to the project. Repeated tests confirmed their rightness. The final evaluation of quality and usefulness of the prototype articulated joint in the connections of movable protection barrier were defined during the crash tests on the test track of the Certified Research Laboratory of the Research Institute for Roads and Bridges. The crash tests were performed for selected collision criteria (TB11 and TB32), normal restrain level (N2), using three passengers cars. Applied concrete barrier test procedures are in accordance with the requirements of national standards, that make the equivalents of the European standards.
Źródło:: Journal of KONES; 2011, 18, 1; 85-92
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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