Description | The steering arm tie rod toggle angle is the angle measured from the tie rod to the steering arm in plane formed by steering arm and tie rod. |
Units | Angle |
Request Names | ■steering_arm.toggle_angle_left ■steering_arm.toggle_angle_right |
Inputs | ■Kingpin (steer) axis location (KPP) left and right ■Kingpin (steer) axis unit vector (kpv) left and right ■Tie rod to suspension upright location (TR0) left and right ■Tie rod to steering location (TRI) left and right |
Method | The vector T from the tie rod to the suspension upright location or tie rod outer (TRO) to the tie rod to steering system or tie rod inner (TRI) is given by the difference between the two locations: T = TRI - TRO For suspensions having a relay rod to transmit steering motion from one suspension upright to the other, the right side tie rod outer location is used as the left side tie rod inner. Likewise the left side tie rod outer is used for the tie rod inner for the right side. The cross product of T with the steering arm vector SA gives a vector N perpendicular to the plane containing T and SA N = T x SA And the cross product of N with T gives a vector B that lies in the plane formed by T and SA that is perpendicular to T B = N x T The unit vectors t and b in the directions of T and B are given respectfully by: b = B/|B| t = T/|T| Finally, the steering arm toggle angle is given by the arc tangent of ratio of component of the steering arm vector in direction b to the component of SA in the direction of T: steering_arm.toggle_angle = TAN-1((SA o b)/(SA o t)) |
Request Statements | Steering Arm Toggle Angle (and Length) REQUST/id, FUNCTION=USER(900,49,characteristics_input_array_id,0, , left_tie_rod_outer_id, , left_tie_rod_inner_id, , right_tie_rod_outer_id, , right_tie_rod_inner_id)/ |
Nomeclature | ■Bold text in uppercase letters, such as R, shows vectors. ■Bold text in lowercase letters, such as u_lon, shows unit vectors. ■X is the vector cross product operator. ■o is the vector dot product operator.· * is the scalar multiplication operator. ■| R | is the length (norm) of the vector R |