To do this we will use the maximum tractive effort calculated in equation 9 which was 100 lbs., and the radius of the wheel (1/2 the diameter). Q_];�޿�������˫��+���W���r�p7r�����j����՛-�ۋػ1 ��A�1�H� Tire Ground Adhesion and maximum tractive effort . Drive Wheel Motor Torque Calculations . The answer is no. q��3Bi�ū��չ(ȩ�U�A���e̸aQU��d�x�I@H�}��#��*l��a���t:ܣM���ޓVF|�Q�U(�U�J��j��%��G`3 �|?d5���QԸ��`���)=~3l ȕ���F+k��`D�d݀}�ώ�A �)u��d�w��I������������X!΢ҍ(��]���x�q�MI�5��P��Q �3��Rӊ�Խ3{�+s��py��e���I�PI�n�ҫ�7z�Y�NvW�$� ��u���޺aH�� �6�mt#A\`t��y���ڒ-���]_x��T�#. 4 0 obj 1. #x������D^*]��=��V��i:l�E�� s�B+{��X8v�t@��-/�;�V�l��Ol�y?�-�M�Ϣ������*���*?��t���-�&ނE.cq��O��ybCۉ*z���m7[�,� [/��#��_���U���GE���w��#�� ��D67۟���G��F�,3�E�'��K�S�'�T_'lE@X�w�.z�J�l�v��M�����0R��*H^�x(ObEH�4��`�)�|�糰|���p>�\Z��t�әGKy,�+`�ę��I�6l���6�1�s�t\�. Power Range Calculations 1. Train resistance and tractive effort are both measurements of force (typically in pounds in North America) so we can simply overlay the curves How do we relate tractive effort curves to train resistance? /Rotate 0 Normally the maximum speed is limited by the engine's running speed. Tractive effort is generally equal to or a little greater than the hauling capacity of the locomotive. 5 0 obj In this paper, the following will be described. Read more on accceleration here.We want to find the acceleration of the train, and we can use algebra to rearrange F=MA, making it Acceleration = Force/Mass. In other words, it is the sum of the tractive force and rolling effort on the road surface. << Tractive Effort of Steam Locomotives (Locomotive Ratios—II) By A. I. LIPETZ,1 SCHENECTADY, N. Y. /Kids [ 5 0 R 7 0 R 9 0 R 11 0 R 13 0 R 15 0 R ] Tractive effort or tractive force is measured in kilo-Newtons (kN) or pounds force (lbf) where 1 kN = 228.4 lbf. Tractive Effort and Acceleration CE 322 Transportation Engineering Dr. Ahmed Abdel-Rahim Available Tractive Effort Tractive effort determined by: Force of vehicle’s engine Maximum value transferable Maximum Tractive Effort Define the point at which additional engine-generated tractive effort is not productive. F = μ t W = μ t m a g (1). Tractive effort curves have proven their use far away. The Total Tractive Effort (TTE) is the sum of the forces calculated in steps 1, 2, and 3. Tractive effort is influenced by the friction coefficient, which is the ratio of torque and wheel or axle load (mass). /Annots [ 45 0 R ] So to find the acceleration (and thus the speed) we need to know the force acting on the train and the mass of the train. Wheel flange contact adds additional friction. /Resources << For an electric locomotive or a diesel-electric locomotive, starting tractive effort can be calculated from the amount of weight on the driving wheels (which may be less than the total locomotive weight in some cases), combined stall torque of the traction motors, the gear ratio between the traction motors and axles, and driving wheel diameter. Tractive effort can be theoretically calculated from a locomotive’s mechanical characteristics (e.g., steam pressure, weight, etc. endobj /Type /Pages (15) 100 lbs x 2.5 inches = 250 in lbs of torque Our last step is to calculate the approximate horsepower required to generate this torque at this speed. (On higher speed vehicles friction in drive components may warrant the addition of 10%-15% to the total tractive effort to ensure acceptable vehicle performance.) tractive coefficient was calculated, and the maximum tractive force control was proposed. ���I"�?��+��d��2����W��]qvlWA�a��D�'�xz*V2��1����a�l�ߙQW��bSL��D�1�D��Gn��t�y 7gYl�u�Y�t�`��8����[���� ���w�HB�&n�y>ۖ� B�yX��������6���+�uy]1��sōx�a����E!���m{�^��¾s�ʝj�ϴ��[�ؒ� ��w #�@���s�0 22 and 23, tractive force in a steady state is measured using a warping gauge. /Fcpdf1 18 0 R �C���!�rUu:��W����r The tractive force between a car wheel and the surface can be expressed as. For example, an AC4400CW has a nominal continuous tractive effort of 145,000 pounds. Thanks A: About 58 mph. endobj >> 1 0 obj μ t = traction - or friction - coefficient between the wheel and the surface. /Length 2221 $���>4u�����c�T�~�h�Y� `V7d@]�mQQM�T���������|n��������'�&ۨ{�4Qo��(4T�W.��F\h�5��J�3E\Ɛ?SK��a`5HD����Q ��)�d�k�L������j֛ p�Z��M�v�9l�vHz��Л���u��ڋ9��s�2d�y�=�9���4i���.�Բ彘gptN�|B4=�h{/��9��'e�RZ��ژ�e��~m�b?�GK�����̒�p}���5b��[�n��J|p�`�}ƽv�����G��/�#Z�h�\���F �@�f�8M�%��!���l��n$i��(�|�����7>H�@�� ���ް1�'��ȦJ�#ݐ&�,F��k��6�}j�GteF6��iIeDq��PC ];�|C%��y7�g�l3;9�3��I���{@�M%���hU�L@�FId��բ=��X�Y�e�����ɐ���7�L��8�.2�i~?l_���q��-E�@�$�V��pT%�4�e�^@(yD�SG���r^�c��i����n����2����WE�4G3P:�,%����d��Ĉ l5��4��p5B;�SL�V��:�q2Ua��i�b3��e�>�o��K�o�����hU�hMۼ�Ap�C^�o����Q�.
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