Replacing the heavy front axle and wheels and readjusting the rear wheel tread
would have been hard and time-consuming work, in spite of what the advertising claimed.
The wheel wear test was carried out by Braghin, Lewis, and Dwyer (2006), based on the full size of wheel/rail rolling contact device, a model which can calculate the wear depth of wheel tread
was put forward, and the wear of ETR500 in Rome-Florence line was simulated through the model.
Paul and Adam analyzed the changes of residual stress in railway wheel during its life and its relationship with wheel tread
contact fatigue damage.
As shown in Figure 2, FCIRW runs at a uniform speed of V along the straight track, and the wheels rotate around their axles at an angular velocity of [omega]; y, [psi], [phi] are the lateral displacement, yaw angle, and roll angle of the wheelset, respectively; [r.sub.L], [r.sub.R] are the rolling circle radius of the left and right wheels; [r.sub.0] is the nominal rolling circle radius of the left and right wheels; [r.sub.0] = V/[omega];[lambda] is wheel tread
Double-point is inherent in intense slippage and wear, which results in occurrence of material plastic flow on the wheel tread
. Conformal comber contact appears to the extent deterioration of working wheel fillet up to the general profile [3-5], and has a number of advantages: contact area rises and specific pressure decreases.
By comparative analyzing the 3D surface reconstruction accuracy in the whole wheel and the detailed part of wheel tread
, a better solution is recommended.
Vehicle parameters of 4WID/4WIS EV Parameter Value m (total mass of vehicle) 830kg [l.sub.f](longitudinal 1103mm distances of cog to front axle) [l.sub.r] (longitudinal 1244mm distances of cog to rear axle) [l.sub.z] (moment of 1157kg [m.sup.2] Inertia around vertical axis) [t.sub.f] 1416mm (front wheel tread
) [t.sub.r] 1375mm (rear wheel tread
) [m.sub.s] 747kg (sprung mass of vehicle) [h.sub.s] 0.54m (sprung mass height)
Underfloor wheel lathes are used by fleet operators to maintain the condition of the wheel tread
, allowing machining of wheel profiles without the need for these to be removed from the vehicle.
These results are summarised in Figure 2; hardness values have been averaged across the wheel tread
(excluding the flange area) and have been converted to Vickers hardness for comparison with other results presented later.
The observations on wheel tread
deformation were published in 1970, but, over 40 years later, the UK railways still re-turn their 'worn' wheels unnecessarily, costing many millions of pounds every year.
The wheel hub has been redesigned with a curved slope to give improved resistance to side-impact thrusts by "bouncing back." The super-soft wheel tread
creates a quiet ride, and lateral movement and high impact have no effect on wear, extending caster and cart life up to five times longer than normal, according to Little.
In addition, the results of experimental research conducted by the personnel of Kramatorsk Heavy Machine-Tool Building Plant were compared to the restoration of wheel tread
profiles using a conventional grinding method .