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Research on the effectiveness of the innovative protective structure for vehicles

Borkowski W., Rybak P., Hryciów Z., Starczewski L., Gmitrzuk M., Szcześniak K.

Journal of KONES

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2015

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Vol. 22, No. 1

29--36

EN

This article presents results of the research on developed innovative protective structure for vehicles. The fundamental objective of executed work was to check the correctness of assumed assumptions, shape and geometry of the solution and configuration of components that affect the protective effectiveness during the impact of the explosive. In order to reach that goal, both model tests and experimental tests were carried out. The experimental tests were carried out on the real object. Significant information about the level, directions and nature of affecting dynamic loads were obtained as well as information about their impact on particular structure elements. The MES numerical model of the research object has been developed in LS-Dyna system. Special emphasis was placed on the mapping of complex geometry, configuration of components and their interactions. Test calculations were carried out and then the resistance calculations were made. As a load, generating post-explosion impact wave, the load imposed by normative requirements concerning the way of explosive arrangement as well as the shape and weight. The analysis of obtained results of the experimental and numerical tests allows for high evaluation of effectiveness of proposed solution.

2

Studies on the supporting structure of the ”crossbow” rocket launcher in the aspect of improvement of its resistance properties

Rybak P., Borkowski W., Hryciów Z., Michałowski B., Wiśniewski A., Wysocki J.

Journal of KONES

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2013

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Vol. 20, No. 3

353--358

EN

This paper presents the results of the studies on a special vehicle Polaris Ranger 6×6 800 equipped with the ”Crossbow” antiaircraft rocket launcher, manufactured by TELESYSTEM-MESKO Sp z o. o. Implementation and Manufacture Centre. The supporting structure of the launcher made the main object of the analysis. The essential goal of that undertaking was to obtain a structure of resistance assuring reliable system operation in various conditions of use. In order to reach that goal, the experimental as well as the model tests have been performed on the launcher vehicle. The experimental tests were carried out during multi-variant rides on the paved roads and in the wilderness of significant level of unevenness. Significant information on the level, directions and nature of affecting dynamic loads and the effects of their influence on the vehicle elements. The analysis of obtained results also provided the data required for a development of a model of the object of the studies. A MES model of the object of the studies was prepared in the LS-DYNA system. A high pressure was put on modelling a complex chassis of the launcher and mutual reaction of assemblies and parts. A generalized issue on the own properties was solved – frequencies and associated forms of vibrations of own main assemblies were designated. Resistance calculations were carried out for assumed loads. In principle, loads imposed by normative requirements for a particular class of armament and military equipment were assumed. Loads resulting from potential conditions of use and installation on other carriers were also included. The tests were performed for various load variants. Sensitive elements of the chassis were modified and highly satisfying results were obtained. It gives a reason to think that the chassis is resistant to expected and difficult operation conditions and assures that the whole system will work reliably.

3

Numerical research on the special container of increased technical and design requirements

Rybak P., Borkowski W., Hryciów Z., Michałowski B., Wiśniewski A., Wysocki P.

Journal of KONES

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2013

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Vol. 20, No. 3

347--352

EN

This paper presents issues related to the process of designing a 30-feet container to be used as a mobile laboratory for collecting the environmental samples and identification of biological threats. Tactical and technical assumptions for the container, taking into account the requirements of the transport and movement of the army at long distances and in the difficult areas by means of transport characterized by increased traction properties, made the starting point. A possible way of relocation on the land roads using commonly available and military means of transport, possibilities of loading and unloading using the autonomic system and automatic levelling system are described. It describes the process of creating the MES model of the supporting structure and assumptions taken for that purpose. The basic assumption included invariability of shape, geometry and dimensions of a container compared to containers recognized in the world as the standard ones. Some results of numerical calculations carried out at two stages are presented. At the first stage, the issues on the own values were solved. Frequencies of own vibrations and associated forms of vibrations were identified. At the second stage, forced container vibrations were analysed. Resistance calculations were performed for the supporting structure of the container in the aspect of evaluation of the strain condition of the whole structure, as well as its components for assumed load variants. A variability of resistance calculations takes into account such cases as the influence of the under-container trailer riding on the uneven ground, loading and unloading a container from a trailer using autonomous system, diversity of loads on the supports resulting from the change of the ground density under the supports. A preliminary analysis of container transport possibilities and transport unit traction properties have been also carried out.

4

Numerical research on dynamic loads of wheeled armoured personnel carrier during overcoming terrain obstacles

Borkowski W., Michałowski B., Rybak P., Wiśniewski A.

Journal of KONES

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2012

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Vol. 19, No. 4

83-92

EN

Paper presents the results of numerical research on the influence of the movement conditions (velocity and various types and parameters of obstacles) on the level of dynamic loads of the body shell and the vehicle crew of the basic version of Wheeled Armoured Personnel Carrier (Wheeled APC) ROSOMAK. The research work was aimed at analysis of the dynamic loads resulting from the overcoming various terrain obstacles. Kinematic constraints acting on suspension used during tests were random and deterministic, e.g. sine, cosine, triangle as well as mixed, imitating fallen tree trunk on smooth surface. Simulations were carried out with the genuine proprietary software for numerical analysis of dynamics of multi-axis vehicles equipped with independent suspension. The paper consists description of the mathematical model of multi-axis vehicle, deterministic and random generated inputs and range of performed tests. Time courses of displacement, velocity, vertical and angular (longitudinal and transverse) accelerations were determined for chosen parts of vehicle. Paper also contains time courses of deflection for every suspension wheel and dynamical reactions of the ground as well as selected time charts and cumulative statistics. Finally paper presents conclusions formulated about dynamic loads of APC ROSOMAK depending on parameters and types of obstacles and vehicle velocity.

5

On one method of dynamical loads restriction and quality raising of the metal-produce of high speed rolling mills

Adamia R., Natriashvili T.

Hutnik, Wiadomości Hutnicze

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2009

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Vol. 76, nr 1

9-11

EN

It is shown in the article, that at irrational correlation of internal and elastic parameters of the main lines of rolling mills, the internalresonant phenomena, having a character of fluctuation of oscillations, arise in their transmissions that in their turn stipulate fatigue destructions of the basic parts and units of rolling mills and quality deterioration of the rolled produce. The higher are the speed conditions of the exploited machinery the greater is a negative effect of influence of the internal-resonant phenomena on durability of constructions and quality of the rolled stock. A rolling process in the finishing groups stands of the wire – and thin sheet rolling mills is especially characterized by such operating conditions.

PL

W artykule pokazano, że przy irracjonalnej korelacji wewnętrznych i sprężystych parametrów głównej linii walcowni, wewnętrzne zjawiska akustyczne o charakterze fluktuacji drgań, powstające podczas procesu mają wpływ na zniszczenie zmęczeniowe podstawowych elementów walcowni oraz pogorszenie jakości produkcji. Im wyższe są warunki prędkości wyeksploatowanego elementu tym większy jest negatywny efekt fluktuacji wewnętrznych zjawisk akustycznych na wytrzymałość konstrukcji i jakość wyrobów walcowanych. Proces walcowania w końcowym etapie grupy drutów i cienkich walcowanych arkuszy jest szczególnie czuły na takie warunki eksploatacji.