iosr-JMCE   Volume-16 ~ Issue-4 ~ July-August 2019

Abstract: Projectile trajectories calculated under non-standard conditions are considered to be perturbed. Tools utilized for the analysis of perturbed trajectories are sensitivity functions: effect functions, weighting factor functions (WFFs) and appropriate Green's functions. These functions are used for calculation of meteo ballistic elements B (ballistic wind vector wB, virtual temperature B, density B) as well.
Since 2013 we are working on improving the theory of these functions. We published the improved theory of generalized meteo-ballistic WFFs in the journal Defence technology in the year 2016 and then the improved theory of projectile trajectory reference heights in the year 2017. Using these theories will improve methods for designing firing tables, fire control systems algorithms, and meteo message generation algorithms. This contribution complements the previous two articles and is dedicated to the key problems of numerical calculations of the sensitivity functions.

Keywords: Exterior ballistic; sensitivity analysis; non-standard (perturbed) projectile trajectory; Green's function; Weighting factor function (curve); effect function; norm effect

[1]. Cech, V. Jedlicka, L. Jevicky, J. Problem of the Reference Height of the Projectile Trajectory as a Reduced Meto-ballistic Weighting Factor.Defence Technology 10, Number 2 (June 2014), Issue 2: Special issue of the 28th International Symposium on Ballistics, ISSN: 2214 – 9147, p. 131 - 140
[2]. Cech, V. Jedlicka, L. Jevicky, J. Problem of the Reference Height of the Projectile Trajectory as a Reduced Meto-ballistic Weighting Factor. Extended Abstract. Proceedings of the 28th International Symposium on Ballistics, Editors: Ames, R. G., Boeka, R. D., Atlanta, September 22 - 26, 2014, p. 7 – 10.
[3]. Cech, V. Jedlicka, L. Jevicky, J. Some Problems with the Estimation of Projectile Trajectory Perturbations. Proceedings of 20th International Conference Engineering Mechanics 2014, Book of full texts, Editor: Fuis, V., Svratka, May 12 – 15, 2014, p. 116 – 119.
[4]. Cech, V. and Jevicky, J. Improved theory of generalized meteo-ballistic weighting factor functions and their use, Defence Technology 12 (June 2016), Issue 3: Special issue of the 29th International Symposium on Ballistics, ISSN: 2214 – 9147, p. 242 -254
[5]. Cech, V. and Jevicky, J. Improved theory of generalized meteo-ballistic weighting factor functions and their use, Extended abstract. Proceedings of the 29th International Symposium on Ballistics, Volume 1, Editors: Woodley, C., Cullis,I., Edinburgh, May 9 -13, 2016, p. 92 -95.

Abstract: Experimental and numerical models were conducted to investigate water flow over gabion weirs. In the experimental study, the water surface profile (WSP) was measured for different discharges, flow patterns and downstream face slopes. In the numerical study, ANSYS® FLUENT Computational Fluid Dynamics (CFD)software was used to numerically simulate the flow over gabion weirs. The Reynolds-averaged Navier–Stokes equations were solved to predict the flow domain. The volume of fluid (VOF) method was applied to treat the complex free-surface flow. Structured high dense mesh was employed.The standard k-ε turbulence model was used to analyze turbulence downstream weir. The experimental results were used to verify the numerical model by two statistical indicators; the root mean square error (RMSE) and the mean absolute percent error (MAPE). Numerical results of the WSP showed good agreement with the experimental results. The values of RMSE and MAPE were between (0.60% – 2.49%) and (0.53% – 1.92%) respectively.

Key words: Gabions, Porous Weir, Experiment Model, CFD, VOF, Water Surface Profile

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[5]. Chen, Y.; Fu, Z.; Chen, Q.; Cui, Z. Discharge Coefficient of Rectangular Short-Crested Weir with VaryingSlope Coefficients. Water 2018, 10, 204..

Abstract: The main objective of the present works related to the material characterization of fabricated Al-6061 by stir casting technique as increasing percentage by weight and the particle size of B4C increased their strengthening effect and a distinct advantage is the ability to use many combinations of resins and reinforcements especially in aerospace industry. Furthermore, the effects of reinforced particles sizes on the microstructure of the composites were observed by using SEM. The finer particles will provide more efficient barriers to dislocation flow in aluminum matrix and more homogeneously distributed. Larger particles are more susceptible to gravity settling and can result in clustering and agglomeration of reinforcement in matrix region. aluminum metal matrix composites.

Keywords: Particle Size, microstructure, Aluminum Metal Matrix Composites, Stir Casting Technique, Reinforcement.

[1]. Gagandeep Singh, Ashwani kumar, 2019, "A review paper on stir casting of reinforced aluminium metal matrix composite ( MMC), IJCET, Vol.9, No.3
[2]. Gagandeep Singh, Ashwani kumar, 2019, "Investigation of compression strength of al 6061 based B4C reinforced meta matrix composite (MMC)", IJERS, DOI- V3.I1.05.2019.00023
[3]. HC Anilkumar, Hebbar HS, KS Ravi shankar, 2011, "Mechanical properties of fly ash reinforced aluminium alloy composites ,IJMME, 41-5
[4]. Khalil HA, Bhat IU, Jawaid M , Zaidon A 2012, "Bamboo fibre reinforced biocomposites:Areview. Materials and Design", 42:353-68.
[5]. Nrip jit,Anand K. Tyagi, Nirmal Singh, 2006, "Evolution of metal casting (A review study)", Proceeding of International Conference on AME, 295-298.

Abstract: The increase in private vehicle ownership by urban residents has caused most housing residents to park their vehicles on street. This creates traffic problems and disrupts the comfort of pedestrians, cyclists and others. The aims of this study is to explain the factors that influence urban mass housing residents to park their four-wheeled vehicles on street, as well as explain the occupant relationship model and housing conditions to their behavior of parking......

Keywords: Vehicles, On Street parking, Housing

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