Numerical and Experimental Development of a Hub+Bearing System for Tire Pressure Control

2018 ◽  
pp. 333-341
Author(s):  
Guido Belforte ◽  
Carlo Ferraresi ◽  
Daniela Maffiodo ◽  
Vladimir Viktorov ◽  
Carmen Visconte ◽  
...  
Keyword(s):  
Pressure Control ◽  
Tire Pressure ◽  
Experimental Development ◽  
Bearing System

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.

scholarly journals Substantiation of prospective direction for developing devices to reglate pressure in truck tires

2021 ◽  
pp. 136-140
Author(s):  
Mykola Mykhalevych ◽  
Alexey Prosyak
Keyword(s):  
Pressure Control ◽  
Practical Significance ◽  
Pressure Regulation ◽  
Tire Pressure ◽  
Pneumatic Tire ◽  
Truck Tires ◽  
The Difference ◽  
Monitoring Devices ◽  
Reasonable Prospect ◽  
Pneumatic Tires

Analysis of the theory of the car and its basic elements makes it possible to state the exceptional importance of the pneumatic tire, which provides movement during the operation of the vehicle. The most important parameter that characterizes the condition of the pneumatic tire is the pressure, which can fluctuate during movement, but, at the same time, is a controlled parameter due to the possibility of inflating the tire in the presence of special devices during movement. Methodology. The purpose of the article is a reasonable prospect of creating new models of devices for tire pressure regulation in trucks. To achieve this goal, the methods of hypothesis, mathematical modeling to confirm it, methods of analysis, generalization were used. Results. The article proves that under the influence of the load on the wheel, the air temperature in the tires will be different and, accordingly, there will be differences in the pressure parameters in the pneumatic tires of trucks. In this regard, the solution to the issue of tire pressure regulation in trucks should be considered from the standpoint of differentiated pressure regulation, taking into account the difference in pressure parameters, which allows pumping each individual tire without a forced stop. Originality. The scientific novelty of the article is that it substantiates the promising direction of development of pressure monitoring devices in truck tires based on the analysis of the theoretical model of heating the pneumatic tires. Practical value. The practical significance of the study is that the article identifies the need to change approaches to pressure regulation based on the transition from centralized pumping systems to pumping systems based on a differentiated approach to individual air pressure control systems in truck tires.

scholarly journals Development of a Test Rig and Experimental Verification of the Performance of HSFDs for Active Control of Rotors

1995 ◽  
Author(s):  
A. El-Shafei ◽  
M. El-Hakim
Keyword(s):  
Control System ◽  
Active Control ◽  
Control Strategy ◽  
Computer Control ◽  
Pressure Control ◽  
Open Loop ◽  
Rotor System ◽  
Squeeze Film ◽  
Test Rig ◽  
Experimental Development

This paper summarizes the experimental development of hybrid squeeze film dampers (HSFDs) for active control of rotor vibrations. In a recent paper (El-Shafei and Hathout, 1994) it was shown that the automatically controlled HSFD can be a very useful device for the active control of rotors. A complete mathematical model of the open-loop system was developed. An on-off control strategy based on speed feedback was proposed and was shown by the simulation results to be quite effective in controlling the rotor vibrations. In this paper, the development of a test rig for the experimental investigation of the HSFD-rotor system is presented. The design of the test rig, the HSFD and the rotor system are discussed. The experimental set-up consists of the rotor-HSFD system controlled through a pressure control servovalve for controlling the pressure in the sealing chambers. The hydraulic circuit is controlled through a digital computer with a data acquisition and control system. The on-off control strategy with feedback on speed is implemented on the computer control system and is shown to be quite effective in controlling the first mode of vibration of the rotor system.

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.

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