Wheel Rolling Resistance Research Articles

Thin spring steel band wheel with a rubber tread, a development proposal with potential to reduce fuel consumption on some road vehicles

A reduction in vehicle rolling resistance is one of the goals of a partially developed vehicle suspension, called a band wheel or a track wheel. Instead of a pneumatic tyre, a band wheel uses an oval thin spring steel band with a very low hysteresis energy loss. The lower segment of the oval band acts like a leaf spring suspension. The current status of this suspension development is summarized. The rolling loss of the band wheel is calculated and estimated. New details describe the steps in producing and forming the critical thin steel spring-loaded band structure. Bonding of a rubber tread to the steel requires close attention to tread design to minimize its rolling resistance. A development project is needed to produce highly uniform and durable spring bands to demonstrate and measure the band wheel rolling resistance.

Numerical analysis of grinding power consumption of a vertical planetary mill

Abstract Planetary wheel rolling on a coal-bed was simplified as rigid wheel rolling on the coal-bed with a rigid base when a Vertical planetary mill (VPM) is running. Based on our analysis, we conclude that the Bekker formulation for computing rolling resistance is not applicable to calculate directly the rolling resistance of the wheel. According to the principle of the Bekker apparatus, pressure-sinkage curves were obtained by tests on a piece of mono-axial consolidation apparatus used in soil-mechanics. The deformation modulus of the coal-bed was calculated using elastic mechanics. A finite element model of the planetary wheel coal-bed was built up by the use of a rigid and a Drucker-Prager material model in LS-DYNA. According to the simulation results, the wheel rolling resistance, the grinding power consumption and the motor power of the mill were calculated and the mistake in the initial design of the mill was modified. The simulation results agree well with the results of the semi-industrial tests.

Parametric Identification of Vehicle Longitudinal Motion

The work explores the problem of automobile longitudinal motion parameter identification by analytical methods with use of free braking tests results under wheel rolling resistance force and aerodynamic force action (the run-down mode).

Basic Studies on the Resistance Received by a Wheel Rolling on a Soft Ground

In this report, description is first made from the results of experiments made by the electrical, automatic M-T (Mashima-Takahashi) wheel rolling resistance measuring device. The Takahashi's theoretical equation, based on the experimental results, are then derived which show the relations among the resultant rolling resistance R received by the wheel from soft ground (S. G.), its horizontal component H and vertical component V, the direction θ, the coordinates (X, Y) of the point Q where the force is applied, the driving torque of wheel M, etc., on one hand and the breadth of wheel b, the wheel diameter 2r, the sinking depth at the lowermost end of wheel y0, the characteristic constants of S. G. sample k and n, coefficient of friction μ, etc., on the other hand. It is explained that these formulas represented in vector are convenient for practical purposes. From the formulas, it is also found that the values of R, H, V, θ, Q (X, Y), etc. differ between the two cases, i.e. when the wheel is pulled and the wheel rotates under axial driving. Finally, the theoretical formulas on the rolling resistance of a vehicle running on S. G. are obtained from the formulas for a single wheel. Applications of the studies for practical purposes are also described.

Rolling resistance of wheeled vehicles on deformable terrain

The rolling resistance of individual wheels, and groups of wheels, can be evaluated by assuming the terrain on which they roll to have a linear pressure-sinkage relationship. Although the formulae derived on this simplified basis do not permit of an accurate computation of the rolling resistance of a particular vehicle on a specified terrain, they demonstrate, as have experimental studies, that the rolling resistance is dependent on the actual configuration of the wheel arrangement and the manner in which the loads are distributed on the wheels themselves.