| 主权项 |
1. A method of measuring conicity, comprising:
measuring lateral force generated in a tire using four lateral force-sensors attached to a spindle at regular intervals about the spindle, wherein each lateral force-sensor measures a lateral force at a corresponding position of the spindle generated during rotation of the tire; amplifying individual signals measured by the lateral four force-sensors via an amplifier; converting four analog signals amplified by the amplifier into digital signals using a data acquisition (DAQ) board provided with an analog/digital (A/D) converter; and generating a conicity value by a microprocessor executing a control program embedded in a memory of the DAQ board, the conicity value generated using values measured by the four lateral force-sensors, a value obtained by summing the values measured by the four lateral force-sensors, a predefined delta load, and a factor; wherein, when values of the individual signals measured by the four lateral force-sensors are Y1, Y2, Y3 and Y4, respectively, the conicity is generated by the control program executed by the microprocessor by the following equations (1), (2) and (3);
Fy(LFV)=(Y1+Y2+Y3+Y4)/4 (1),Fy(LFD)=(−Y1+Y2+Y3−Y4)/4-Delta Load×factor (2),Conicity=(LFDcw+LFDccw)/2 (3), wherein, value of Delta load is set within 400˜800 kgf in a scope of the tire test load; the value of the factor is, if the full range is 20000 N, it set the range between 0.004 to 0.009, LFDcw is an average value of the lateral force generated during clockwise rotation, and LFDccw is an average value of the lateral force generated during counterclockwise rotation. |
