scholarly journals Rating forces grip and driving and accelerations of the car with drive different configuration

2015 ◽  
Vol 36 (1) ◽  
pp. 65-78
Author(s):  
Mariusz Kowalski
Keyword(s):  
Adhesive Strength ◽  
Driving Force ◽  
Rear Axle ◽  
Front Wheel ◽  
Drive System ◽  
Passenger Car ◽  
Wheel Drive ◽  
Drive Systems ◽  
Four Wheel Drive ◽  
Mathematical Relations

Abstract The paper shows a typical drive systems used in today's vehicles, mainly cars. Approximated scheme of the formation of the driving force of the vehicle and the necessary mathematical relations for the calculation. For example, a typical passenger car BMW 320 was analyzed and calculations obtained a driving force, of adhesion and acceleration. The calculations were performed for the drive system, the classical (i.e. the rear axle of the vehicle) for front-wheel drive and four-wheel drive (4×4). Virtually assumed that to the above mentioned vehicle it is possible buildings of each of said system. These are shown graphically in diagrams bearing a distribution of the forces acting on the substrate and the reactions - the data necessary for the calculations. The resulting calculation is graphically shown in the diagrams, in which is illustrated a change value of the resulting adhesive strength, and the acceleration depending on the drive type vehicle.

Modeling of nonlinear torsional vibration of the automotive powertrain

2016 ◽  
Vol 24 (9) ◽  
pp. 1774-1786 ◽  
Author(s):  
Sérgio J Idehara ◽  
Fernando L Flach ◽  
Douglas Lemes
Keyword(s):  
Natural Frequency ◽  
Torsional Vibration ◽  
Degrees Of Freedom ◽  
Front Wheel ◽  
Torsional Stiffness ◽  
Bench Test ◽  
Passenger Car ◽  
Engine Torque ◽  
Friction Moment ◽  
Wheel Drive

A vibration model of the powertrain can be used to predict its dynamic behavior when excited by fluctuations in the engine torque and speed. The torsional vibration resulting from torque and speed fluctuations increases the rattle noise in the gearbox and it should be controlled or minimized in order to gain acceptance by clients and manufactures. The fact that the proprieties of the torsional damper integrated into the clutch disc alter the dynamic characteristic of the system is important in the automotive industry for design purposes. In this study, bench test results for the characteristics of a torsional damper for a clutch system (torsional stiffness and friction moment) and powertrain torsional vibration measurements taken in a passenger car were used to verify and calibrate the model. The adjusted model estimates the driveline natural frequency and the time response vibration. The analysis uses order tracking signal processing to isolate the response from the engine excitation (second-order). It is shown that a decrease in the stiffness of the clutch disc torsional damper lowers the natural frequency and an increase in the friction moment reduces the peak amplitude of the gearbox torsional vibration. The formulation and model adjustment showed that a nonlinear model with three degrees of freedom can represent satisfactorily the powertrain dynamics of a front-wheel drive passenger car.

Stages in the Development of Four-Wheel Drive Systems in Audi Passenger Cars

1991 ◽  
Author(s):  
Bernd Hessing ◽  
Ernst Muller ◽  
Jurgen Stockmar
Keyword(s):  
Passenger Cars ◽  
Wheel Drive ◽  
Drive Systems ◽  
Four Wheel Drive

Paper 7: Ground-Drive Systems for High-Powered Tractors

1969 ◽  
Vol 184 (17) ◽  
pp. 58-67
Author(s):  
L. E. Osborne
Keyword(s):  
Soil Compaction ◽  
Rolling Resistance ◽  
Theoretical Work ◽  
Wheel Drive ◽  
Drive Systems ◽  
Four Wheel Drive ◽  
Work Done ◽  
Tyre Wear ◽  
Engine Power

Attempts to solve the problem of transmitting high engine power to the drawbar have resulted in a variety of tractor designs. Measured rates of work on two- and four-wheel drive tractors and a tracklayer showed that while the four-wheel drive had the highest output, the tracklayer was more efficient for heavy draught operation. The two-wheel drive machine has a higher rolling resistance than the four-wheel drive and methods of measuring rolling resistance are described. The paper discusses the reasons that different performances are obtained from two- and four-wheel drive vehicles of the same engine power, and highlights some of the advantages to be gained. Previous theoretical work on two- and four-wheel drive tractor performance and on transmissions for four-wheel drive is also discussed, together with practical limitations on tyre size for operation under certain conditions. A small survey to measure tyre and track wear is described and a method is suggested of relating tyre wear to work done by quoting tyre costs per gallon of fuel used. The paper concludes with a few comments on soil compaction.

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