Description: Here was done an analysis of standards for the assessment of patency of military vehicles samples. It has been found that the use of outdated standards is inappropriate given the fundamental difference from NATO's methodologies and standards in this area. Also was comparative analysis of well-known studies and the methods of assessing the patency of vehicles with allwheel drive. We found that NATO countries use a technique for the experimental assessment of the possibility of the respective surfaces which based on the using of the CI (Cone Index) ,and unlike the common "Soviet method" for Ukraine, it takes into account soil moisture and physical mechanical characteristics of respective surfaces . The CI (Cone index) method allows for us with help of standardized software to determine more rational routs and approximate speeds (time loss) for appropriate military machine movements. We have proposed a method for assessing the patency of wheeled military vehicles, and it takes into account the achievement of post-Soviet and the NATO bloc scientific schools. The measured areas was selected in according to the classification of off-road surfaces, which are defined in the professional literature, with varying numerical values of characteristic parameters, the measured areas corresponding to the main off-road type. Experimental was done for obtain the experimental speeds of movement of wheeled military vehicles with all-wheel drive samples to verify the adequacy of the model of movement of wheel military vehicles samples developed in the MATLAB Simulink software environment. As a results of the experimental, we received the maximum possible velocity of movement at typical reference surfaces for some military vehicles with all-wheel drive (KAMAZ-4310 and KrAZ-5233), which used in Ukraine.
Keywords: off-road, experimental patency assessment, bearing surface, bearing ability of ground, samples of military vehicles
1.Hrubel, M.H., Krainyk, L.V. and Bodnar, M.F. (2019), “Otsinka tiahovo-shvydkisnykh kharakterystyk viiskovoi avto-mobilnoi tekhniky za umov rukhu bezdorizhzhiam metodamy imitatsiinoho modeliuvannia” [Estimating of military vehicles traction-speed characteristics in off-road conditions using imitation modeling methods], Weapons and military equipment, No. 3(23), pp. 46-53.
2.Hrubel, M.H., Krainyk, L.V. and Kuprinenko, О.М. (2019), “Metodolohiia otsinky opornoi prokhidnosti kolisnoi viisk-ovoi avtomobilnoi tekhniky” [Methodology of military vehicles wheel performance assessment], Weapons and military equipment, No. 4(24), pp. 12-22.
3.Ageikin, Ya.S. (1981), “Prokhodimost' avtomobiley” [Passable vehicles], Engineering, Moscow, 230 p.
4.Wong, J. (1982), “Teoriya nazemnyih transportnyih sredstv” [Theory of Land Vehicles], Engineering, Moscow, 284 p.
5.Wong, Y.J. (2010), Terramechanics and off road vehicle engineering, Butterworth – Hannemann, London, 482 p.
6.Krainyk, L.V. and Hrubel, M.H. (2010), “Bahatofaktorna otsinka ta normuvannia palyvnoi ekonomichnosti vantazhnykhavtomobiliv” [Multifactor assessment and normalization of lorries fuel efficiency], National Army Academy, Lviv, 117 p.
7.USSR Ministry of Defense (1989), “Podgotovka i soderzhanie putey dvizheniya voysk” [Preparation and maintenance oftroop movement routes], Military publishing house, Moscow, 301 p.
8.ISO 22476-1:2012 (2017), Geotechnical investigation and testing. Field testing. Part 1: Electrical cone and piezoconetest, 28 p.
9.Chang, B.S. and Baker, W.J. (1973), Soil parameters to predict the performance of vehicles, Journal of Terramechanics,No. 2, pp.13-31.
10.Khitrov, E.G., Grigorev, G.V., Dmitrieva, I.N. and Ilyushenko, D.A. (2014), “Raschet konusnogo indeksa po velichinemodulya deformaczii lesnogo pochvogrunta” [Calculation of the cone index by the magnitude of the modulus of deformation of the forest soil], Systems. Methods. Technologies, No. 4(24), рр. 127-131.
11.Shoop, S.A. (1993), Thawing soil strength measurements for predicting vehicle performance, Journal of Terramechan-ics, Vol. 30, Issue 6, pp. 405-418. https://doi.org/10.1016/0022-4898(93)90034-U.
12.Rowland, D. and Peel, J. (1975), Soft ground performance prediction and assessment for wheeled and tracked vehicles,Institute of mechanical engineering, No. 205, рр. 81-92.
13.Wong, Y.J. (2010), Terramechanics and off road vehicle engineering, Butterworth – Hannemann, London, 482 p.
14.Wong, Y.C.D., Lim, H.H.S. and Chan, W.Q.W. (2016), An assessment of land vehicles trafficability, DSTA HORI-ZONS, рp. 54-63, available at: www.dsta.gov.sg/docs/default-source/dsta-about/an-assessment-of-land-vehicles-trafficability.pdf?sfvrsn=2/.