On the mobility of military wheeled vehicles on the ground
2s14.blogspot.com 5 years ago
Theory One of the very important, but frequently forgotten parameters of the improvement of military ground vehicles among engineers is their mobility in the field. In this respect, the ability of wheeled vehicles to overcome fine-grained soils and their crucial swelling is crucial, as is illustrated by, for example, the many agricultural fields in Europe. Sometimes the ability to overcome sandy areas is besides taken into account, the model of which is the era. The ability to cross specified areas shall be determined by calculating the surface pressures of the test vehicles and by referring them to the burden capacity of the land on which they are to move. In our country the 2 most basic methods of calculating pressures are utilized - this is the United States method Vehicle Cone Index (VCI) and the UK method Mean Maximum force (MMP). This article will present the values calculated utilizing the MMP method. Mean Maximum Pressure The method of calculating surface pressures utilizing the MMP expression is expressed utilizing the following formula:
As regards the results of the calculation, the criteria are as follows: - up to 200 kPa - very good field mobility - above 200 kPa - tendency to bury the vehicle in the ground - above 300 kPa - limited mobility in the field - above 400 kPa - the wheeled vehicle should not leave paved roads Indications: - m - mass of vehicle - g - gravitational acceleration - n - number of axles in the vehicle - d - outer diameter of the tyre - b - tyre width - I'm sorry.
- K - fixed according to the number of axles and drive axles in the vehicle For constant K, the table below will explain what values this constant takes
Just the theory, time to go to the bench. Benchmark military tyres Here is simply a summary of the dimensions for the individual tyres at the presumption that: - the ratio of tyre bending to its profile tallness is 35% (highest value in military vehicles with the anticipation of regulating tyre pressure) - the mark surface force is 300 kPa - The ground is dry agricultural land with fine grain structure, large pulsity and advanced water saturation
Benchmark of military wheeled vehicles utilized in or proposed for the Polish Army
Family of wheeled armored transporters Rosomak
SKOT armoured wheel transporter family
Family of military terrain cars Honker
Trucks developed in Starachowice
Military trucks developed in Laskowice
Wheeled vehicles developed by AMZ-Kutno
Wheeled vehicles developed by Concept from Bielsko-Biała
Wheeled vehicles developed in the United States
Wheeled vehicles developed in the russian Union
Additional bibliography Agnieszka Dąbrowska, Marian Szpatka, "Evaluation of the ability of vehicles with a maximum permissible weight of 14 tonnes to overcome low burden capacity terrain", Logistics 3/2015, pp. 916-921 - M. Saarilahti, Modelling of the wheel and thyre. 1. Tyre and dirt contactSoil Interaction Model. Appendix study No. 5, pp. 24-29 Remarks Not all vehicles have tyre force control systems, so the results given may not necessarily be realistic.
