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Chosen Development Problems of Wheeled Armoured Transporters

Abstract

Modern wheeled armoured vehicles are constructed as multipurpose. Universal construction of vehicle is achieved in two separate ways: as specialized versions of vase model or by using exchangeable mission-modules. Realization of various tasks requires different equipment; ensure adequate level of protection and firepower. Increase of protection level, implementation of weapon systems, characterized by high firepower despite technological advancement in this field affect vehicles weight increase and therefore, it also affects requirements for other vehicle systems. Ensuring high mobility requires use of high power, turbocharged diesel engines, hydro mechanical transmission, hydro pneumatics suspension, possibility of clearance adjustment, use of central wheel pumping system enabling tire pressure change according to the surface on witch vehicle runs. This study gathers and compares characteristics of selected wheeled armoured personnel carriers and determines possible directions of development for future wheeled vehicles.

Open access
Automation of the Calibration Process as One of the Directions of Development of Military Metrology

–147 [ Sources of time and frequency. Current status and directions of development — available in Polish]. [7] Standard PN-EN ISO/IEC 17025. [8] Wojskowe Centrum Metrologii [Military Center of Metrology], [online], https://wcm.wp.mil.pl/pl/ [access 28.01.2019].

Open access
Urban Transport Safety Improvement Based on Centralized Traffic Control System, Colombian Case Study

Science and Network Security, Vol. 7 (7), Julio 2007. [7] Thai, T. L., Lam, H., NET framework Essentials , O’Reilly & Associates, 2003. [8] Marmol, F., Programación orientada a objetos en C# , Universidad de Murcia, Julio 2004. [9] Montilva, J., Gharawi, K. H. M., The watch model for development business software in small and midsize organization , IV World Multiconference on Systemics, Cybernetics and Informatics (SCI’2000), Orlando, Florida (USA), Julio 2000. [10] República de Colombia, Ministerio de Transporte, Manual de Señalización vial

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Study of Bypass Ratio Increasing Possibility for Turbofan Engine and Turbofan with Inter Turbine Burner

Abstract

Current trends in the high bypass ratio turbofan engines development are discussed in the beginning of the paper. Based on this, the state of the art in the contemporary turbofan engines is presented and their change in the last decade is briefly summarized. The main scope of the work is the bypass ratio growth analysis. It is discussed for classical turbofan engine scheme. The next step is presentation of reach this goal by application of an additional combustor located between high and low pressure turbines. The numerical model for fast analysis of bypass ratio grows for both engine kinds are presented. Based on it, the numerical simulation of bypass engine increasing is studied. The assumption to carry out this study is a common core engine. For classical turbofan engine bypass ratio grow is compensated by fan pressure ratio reduction. For inter turbine burner turbofan, bypass grown is compensated by additional energy input into the additional combustor. Presented results are plotted and discussed. The main conclusion is drawing that energy input in to the turbofan aero engine should grow when bypass ratio is growing otherwise the energy should be saved by other engine elements (here fan pressure ratio is decreasing). Presented solution of additional energy input in inter turbine burner allow to eliminate this problem. In studied aspect, this solution not allows to improve engine performance. Specific thrust of such engine grows with bypass ratio rise – this is positive, but specific fuel consumption rise too. Classical turbofan reaches lower specific thrust for higher bypass ratio but its specific fuel consumption is lower too. Specific fuel consumption decreasing is one of the goal set for future aero-engines improvements.

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Application of Anisotropic Thin Plate Theory for Development of Displacements for Silicon <111> Crystals Plates in Cylindrical Systems

Abstract

Silicon <111> crystal is one of the crystal orientations, which shows potential for application in micro device developments of pressure diaphragms for measurement purposes. To date, no theoretical basis has been examined to develop the deflections for computational analysis purposes [1]. This paper presents the development of the diaphragm deflections for Silicon <111> Crystal in Cylindrical coordinates system. The Silicon <111> crystal possesses transverse isotropic properties. Thus, an anisotropic thin plate theory is used here to develop the plate deflection. A numerical example is given to compare the theoretical results with Finite Element Analysis (FEA) results.

Open access
Tooling Development for Thermoplastic Composites Thermoforming Process Based on FEM Analysis – a Rib Case Study

., Woodhead Publishing, pp. 111-129, doi:10.1016/B978-1-78242-307-2.00006-3, 2015. [5] Robroek, L., The Development of Rubber Forming as a Rapid Thermoforming Technique for Continuous Fibre Reinforced Thermoplastic Composites, 1994. [6] Abaqus Analysis User’s Manual – Dokumentacja programu Abaqus 6.12.

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Strength Development and Durability Properties of Concrete Containing Pre-Soaked Rice Husk Ash

, C. Pinillos, “Early-strength development of Portland cement mortars containing air classified fly ashes,” Cement and concrete research , vol. 25(2), pp. 449-456. 1995. [9] J. Paya, J. Monzo, M.V. Borrachero, E. Peris, E. Gonzalez-Lopez, “Mechanical treatment of fly ashes. Part III: studies on strength development on ground fly ash cement mortars,” Cement and concrete research , vol. 27(9), pp.1365-1377, 1997. [10]A. N. Givi, S. A. Rashid, F. N. A. Aziz, M. A. M. Salleh. (2010.) Contribution of rice husk ash to the properties of

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Development of an on-Line Damage Detection, Discrimination and Tracking System for the Spin Rig Facility

., The Use of Eddy Current Sensors for The Measurement of Rotor Blade Tip Timing: Development of A New Method Based on Integration , ASME Turbo Expo 2016, ASME Paper GT2016-57368, 2016. [9] Christodoulou, L., Larsen, J. M., Materials Damage Prognosis: A Revolution in Asset Management, Materials Damage Prognosis , J. M. Larsen et al. (ed.), TMS, pp. 3-10. 2005. [10] Dimitriadis, G., et al., Blade-Tip Timing Measurement of Synchronous Vibrations of Rotating Bladed Assemblies , Mechanical Systems and Signal Processing, Vol. 16, No. 4, pp. 599-622. 2002

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The Development of Peat and Wood-Based Thermal Insulation Material Production Technology

Abstract

The article presents research results on a thermal insulation material made of low-moor peat. A model based on three components, including peat binder, frame component (wooden aggregate) and additives, was developed in the framework of this study. The conducted research showed that by grinding low-moor peat in water until the particle size is 2–5 mkm increased peat cohesion strength with wooden aggregate 2.5 to 2.7 times as well as increased the compressive strength of peat binder 5.0 to 5.5 times. Optimal parameters of strength and density in the wood peat composition with discontinuous granulometry wooden aggregate were achieved by using two fraction wood filler with fractions 2.5 mm ... 1.25 mm and 0.63 mm ... 0.315 mm in the proportion 50:50 and 60:40. Introducing anionic surfactants and foam forming non-ionic surfactants with neutral reaction against the surface of the peat and wood filler allows to reduce the average density up to 210–220 kg/m3, thus maintaining the required strength, and to reduce the coefficient of thermal conduction to 0.046 W/mK.

Open access