TRENDS FOR THE PROVISION OF SURVIVAL OF WHEELS OF MILITARY CAR EQUIPMENT

2019 ◽  
Vol 1 (12) ◽  
pp. 114-119
Author(s):  
S. Shelukhin ◽  
V. Klimenko
Keyword(s):  
Rolling Resistance ◽  
Armed Forces ◽  
Pressure Control ◽  
Metal Ring ◽  
Tire Pressure ◽  
Support Ring ◽  
The Road ◽  
Military Vehicles ◽  
Pressure Control System ◽  
Adjustment System

The article analyzes the viability of military vehicles from the effects of conventional damage (bullets, splinters), etc. When fired, a car that stops for a short time becomes an easy target and is destroyed. The presence of a tire pressure control system on the vehicles substantially increases the possibility of continued traffic. However, the opportunities of the mobility adjustment system is limited. The required survivability can only be ensured if special wheels are used. RunFlat (flat tire) is the common name for tireless tire technology. The RunFlat car wheel inserts allow you to continue driving after a tire has been punctured or descended, which can, for example, allow the machine to exit the firing zone. The essence of technology is to strengthen the sidewalls of tires. Hutchinson produces wheel inserts of two types - RODGARD and CRF. The RODGARD RunFlat (Rotary RunFlat) system is capable of providing deflated tires thanks to a special patented design. The CRF RunFlat (Static RunFlat) system is a wheel insert that is used as a single unit of the center of the wheel and tubeless tire. Сommon CSR (Conti Support Ring) system includes a metal ring that is fastened to the rim. The disadvantage of this system is that the support ring will only fit in the high profile wheels. The first cars wish RunFlat in the Armed Forces of Ukraine were KrAZ Cougar and Spartan cars. In turn, the main disadvantages of using wheels with RunFlat include, in addition to the much higher cost, the inability to use the tire after long distances. Airless tire (non-pneumatic) is an innovative development that is a one-piece wheel that can replace both the wheel disk and the pneumatic tire.The main advantage of this design is that the wheel does not require pumping, is not afraid of punctures, is resistant to damage and has a long service life. In this case, the weight of the wheel is almost twice as light, the life of such a wheel is two to three times longer, but the cost is more than twice the price of standard wheels. It is proved that the grip of the road surface in such tires is not inferior to traditional tires, and rolling resistance has decreased to hundreds. The Polaris Defense non-pneumatic wheels guarantee significantly better durability than standard tires and can withstand a 12.7mm bullet. The disadvantage of using non-pneumatic (airless) wheels is to create additional load on the suspension of the car due to their rigidity.

scholarly journals Development of an Active Tire Pressure Control System Using a Tire Simulator

2010 ◽  
Vol 35 (1) ◽  
pp. 21-30 ◽  
Author(s):  
Kyu-Cheol Lee ◽  
Kwan-Hee Ryu ◽  
Joong-Yong Rhee ◽  
Ji-Hyang Hong ◽  
Hyeok-Joo Kim ◽  
...  
Keyword(s):  
Control System ◽  
Pressure Control ◽  
Tire Pressure ◽  
Pressure Control System

Potential impact of active tire pressure management on fuel consumption reduction in passenger vehicles

2018 ◽  
Vol 233 (4) ◽  
pp. 961-975 ◽  
Author(s):  
Stefano d’Ambrosio ◽  
Roberto Vitolo
Keyword(s):  
Fuel Consumption ◽  
Working Conditions ◽  
Management Strategies ◽  
Rolling Resistance ◽  
Pressure Control ◽  
Inflation Pressure ◽  
Pressure Management ◽  
Tire Pressure ◽  
Vehicle Performance ◽  
Passenger Vehicles

Active tire pressure management, through an automatic, electro-pneumatic, central tire inflation system, is here proposed as a means of improving fuel consumption in passenger vehicles, as well as safety and drivability. A brief description of the active tire pressure control system, which has been set up at the Politecnico di Torino, is provided as a reference. Different strategies, aimed at reducing rolling resistance, through inflation pressure management, under specific vehicle working conditions, are then illustrated. The fuel benefits that can be achieved by adopting these strategies in passenger vehicles are studied by means of computer simulations using a proprietary software for vehicle performance and fuel consumption estimation. Coast-down coefficients, evaluated experimentally during deceleration tests on a closed track, are generally available at the reference tire pressure prescribed by the original equipment manufacturer of the vehicle. These fixed coefficients can then be used to describe the vehicle in simulation environments. LaClair’s relation, which illustrates the influence of tire inflation pressure on rolling resistance, has therefore been used to recalculate the coast-down coefficients as functions of the tire pressure. This has allowed fuel consumption simulations to be performed on the reference B-segment passenger car under different working conditions. In particular, the following pressure management strategies have been studied: adaptation of the inflation pressure to the vertical load, variation of the inflation pressure during tire warm-up, and adjustment of the inflation pressure, according to the average speed (urban/highway driving). The performed simulations have demonstrated that if the standard tire pressure is maintained, fuel consumption could be reduced by up to 2% in real-world driving; further advantages could be obtained by varying the target pressure as a function of the current working conditions of the vehicle.

PENGARUH PERMUKAAN ALUR KEMBANG (TREAD PATTERN) BAN TYPE RADIAL PLY TERHADAP ROLLING RESISTANCE

ROTOR ◽  
2017 ◽  
Vol 10 (1) ◽  
pp. 51
Author(s):  
Aditya Krisna Hutomo ◽  
Dedy Dwi Laksana ◽  
Fx. Kristianta
Keyword(s):  
Rolling Resistance ◽  
Road Surface ◽  
Resistance Force ◽  
Tire Pressure ◽  
The Road ◽  
Type Complex ◽  
Wheel Rolling ◽  
Surface Contact ◽  
Small Force ◽  
Surface Contact Area

Rolling Resistance is a resistance to the wheels that will and have been rolling due to the force of friction between the wheels with the road surface of the wheel. Rolling resistance is influenced by four factors, that is vehicle weight, road surface, transmission, and tires. This study usefull to determine the influence of tread pattern surface to force and coefficient rolling resistance, tire surface contact area and tire pressure value. In this study using motorcycle tires with size 90/90-17. The tire used is a tire with RIB tread pattern (straight groove) and LUG tread pattern (zig-zag groove). Each type of RIB and LUG tread pattern used each of two tires that is the type of simple tread pattern and the complex tread pattern. From the results of the study showed that the tire with a simple tread pattern will produce a small force of rolling resistance but will result in a larger surface tire surface contact than the tire with the complex tread pattenr. While for the tire with the type complex tread pattern has a greater pressure value that will produce a great rolling resistance force. For tires get the best rolling resistance force is the tire with a simple LUG tread pattern of 10.234 N and followed by a tire with a simple RIB tread pattern type of 10.563 N. Keywords: tread pattern, rolling resistance, rib, lug.

Tire-Soil Modeling for Vehicle Rollover Over Sloped Compressible Terrains

2014 ◽  
Author(s):  
Dale Holtz ◽  
Amandeep Singh ◽  
Michael G. Megiveron
Keyword(s):  
Real Time ◽  
Driving Simulator ◽  
Rolling Resistance ◽  
Soil Conditions ◽  
Driver Training ◽  
The Road ◽  
Military Vehicles ◽  
Soil Model ◽  
Simulated Environment ◽  
Vehicle Rollover

Military vehicles have been experiencing high rollover rates over the last few years of deployment. There have been several hundred rollovers, of which approximately fifty percent are categorized as fall based. Fall based rollover occurs when the road gives way underneath the vehicle on one side as the soil is unable to support the vehicle load. To reduce fatalities, a real-time driving simulator can be used to simulate fall-based rollover for the driver training as well as for validating the effectiveness of advanced suspension technologies. The driver training can help prepare drivers with the varying degrees of terrain difficulties, by applying optimal steering and speed strategies in a simulated environment. The fall-based rollover occurs mainly due to combination of the tire sinkage and the lateral bulldozing. In the current research, equations for the tire-soil model are developed based on the Bekker’s equations and Mohr-Coulomb equations that compute the tire sinkage into the soil, the lateral and longitudinal forces from the soil deformation, rolling resistance due to the soil compaction, and the lateral plowing effects. The tire-soil model is incorporated into a commercial real-time multi-body code to simulate fall-based rollovers for various slopes and soil conditions. Results indicate rollover propensity changes depending the type of soil and the steering strategy used.

scholarly journals Automated Tire Pressure Control System for Multi-Purpose Wheeled Vehicles

2021 ◽  
Vol 20 (1) ◽  
pp. 33-36
Author(s):  
V. P. Boikov ◽  
V. V. Guskov ◽  
A. S. Pavarekha
Keyword(s):  
Heavy Traffic ◽  
Ground Surface ◽  
Pressure Control ◽  
Air Pressure ◽  
Tire Pressure ◽  
Pressure Control System ◽  
Cross Country ◽  
The Cross ◽  
Proposed Regulation ◽  
Wheeled Vehicles

The cross-country capability of multi-purpose wheeled vehicles is one of the most important operational properties of these technical objects. In many ways, it is determined by their traction characteristics. There are a number of ways to improve traction and coupling properties of multipurpose wheeled vehicles, the main ones are the use of various kinds of traction control systems, blocking of  interaxle and interwheel differentials, the use of ballast and several others. Recently, one of the ways to improve the traction properties and cross-country ability of vehicles on soils with weak load-bearing capacity is a regulation of air pressure in the tires of the driving wheels of multi-purpose wheeled vehicles. The paper describes the process of interaction of the wheel mover with the ground surface when the air pressure in the tire changes. The influence of air pressure on the traction properties of wheeled vehicles is established. The system of automatic control of air pressure in tires of mobile cars depending on road conditions is offered. The use of the proposed regulation principle will significantly increase the cross-country ability of multi-purpose wheeled vehicles in heavy traffic conditions, eliminating the subjective factor in the person of the vehicle operator.

Tire-Road Interactions — Harmony or Conflict?

1989 ◽  
Vol 17 (1) ◽  
pp. 66-84
Author(s):  
A. R. Williams
Keyword(s):  
Rolling Resistance ◽  
Major Effect ◽  
Road Surface ◽  
Interactive Effects ◽  
Central Theme ◽  
Water Drainage ◽  
The Road ◽  
Truck Tires ◽  
Road Surfaces ◽  
Tire Wear

Abstract This is a summary of work by the author and his colleagues, as well as by others reported in the literature, that demonstrate a need for considering a vehicle, its tires, and the road surface as a system. The central theme is interaction at the footprint, especially that of truck tires. Individual and interactive effects of road and tires are considered under the major topics of road aggregate (macroscopic and microscopic properties), development of a novel road surface, safety, noise, rolling resistance, riding comfort, water drainage by both road and tire, development of tire tread compounds and a proving ground, and influence of tire wear on wet traction. A general conclusion is that road surfaces have both the major effect and the greater potential for improvement.

One-Dimensional Contact Pressure Distribution of Radial Tires in Motion

1995 ◽  
Vol 23 (2) ◽  
pp. 116-135 ◽  
Author(s):  
H. Shiobara ◽  
T. Akasaka ◽  
S. Kagami ◽  
S. Tsutsumi
Keyword(s):  
Pressure Distribution ◽  
Contact Pressure ◽  
Experimental Studies ◽  
Rolling Resistance ◽  
Leading Edge ◽  
Forward Direction ◽  
Contact Pressure Distribution ◽  
Support Ring ◽  
One Dimensional ◽  
Lowered Pressure

Abstract The contact pressure distribution and the rolling resistance of a running radial tire under load are fundamental properties of the tire construction, important to the steering performance of automobiles, as is well known. Many theoretical and experimental studies have been previously published on these tire properties. However, the relationships between tire performances in service and tire structural properties have not been clarified sufficiently due to analytical and experimental difficulties. In this paper, establishing a spring support ring model made of a composite belt ring and a Voigt type viscoelastic spring system of the sidewall and the tread rubber, we analyze the one-dimensional contact pressure distribution of a running tire at speeds of up to 60 km/h. The predicted distribution of the contact pressure under appropriate values of damping coefficients of rubber is shown to be in good agreement with experimental results. It is confirmed by this study that increasing velocity causes the pressure to rise at the leading edge of the contact patch, accompanied by the lowered pressure at the trailing edge, and further a slight movement of the contact area in the forward direction.

Sign in / Sign up

Export Citation Format

Share Document