Eisaku Sato

Lateral Force between Wheel and Rail during Curve Negotiation of Limited Express Diesel Car with Forced Steering Bogies

SUMMARY In order to shorten the travel time of limited express trains operated between Sapporo and Kusiro in Japan, a tilting diesel car called scries DC283 (passenger car for a limited express train) with forced steering bogies (DC283 forced steering bogies) has been developed by JR Hokkaido and RTRI. This paper describes the lateral force between wheel and rail observed with this test car on curve and that obtained from corresponding computer simulations. The results of simulations and field tests areasfollows. (1)DC283 forced steering bogie can reduce the lateral force. (2) The decrease of the lateral force due to the forced steering bogie should be venfied not only on circular curves but also on transition curves. (3) The lateral force of fitst wheelset is the largest (4) To decrease the lateral force more effectively, the steering ratio is set 35 percent (Lv=1 35) higher than the value that makes the radial position. (5) The running stability at the maximum speed of 140km/h is satisfactory in field tests.

New Measuring Methods of Wheelset Angle of Attack of Railway Vehicle on Curves.

New measuring methods of the wheelset angle of attack of railway vehicles on board and on the ground have been developed by RTRI in Japan. Using these methods, wheelset angle of attack has been measured on curves in the field running tests of limited express trains on a narrow gauge commercial line. The results measured are as follows : (1) The measuring accuracy of these methods attains to that which we aimed. (2) The higher the velocity and the larger the curve radius, the smaller will be the steady angle of attack. The steady angle of attack of the first wheel is 0.28 degrees, and that of the second wheel is 0.02 degrees for a curve radius of 400 m at a velocity of 110km/h. (3) The measurements and the simulation results for wheelset angle of attack are close.