- A2 A The Mass Of A Car Is 1342 Kg Its Semi Wheelbases A And Az Are Respectively 1 51m And 1 10m Without Passengers 1 (73.38 KiB) Viewed 40 times
are respectively 1.51m and 1.10m, without passengers.
When, 2 peoples get in, the position of the centre of mass is
shifted forward by 4 cm. The occupants have the same mass, and they
are seating in the front seats.
If the overall load on the front axle of the car is 6400N, what
is the weight of each passenger.
A2. (a) The mass of a car is 1342 Kg. Its semi-wheelbases a and az are respectively 1.51m and 1.10m, without passengers. When, 2 peoples get in, the position of the centre of mass is shifted forward by 4 cm. The occupants have the same mass, and they are seating in the front seats. If the overall load on the front axle of the car is 6400N, what is the weight of each passenger. [5 points) (b) What is the physical meaning of slip ratio? Explain and then draw a typical graph of longitudinal force against practical slip ratio. [3 Marks] (c) Define side slip at the centre of gravity of a car. Then show that: v+rai Bu u - 0.5rt1 + ra B12 u + 0.5rt1 V - raz B21 u - 0.5rt2 V-raz B21 u + 0.5rt2 Where Bijis the sideslip angle at the ij corner of the car (classic numbers), the yaw rate, u and v the longitudinal and lateral velocities, t, and t the front and rear tracks respectively. [7 Marks] (d) Two peoples seen in (a) are using the vehicle to perform a right turn with a yaw rate 0.3 rad/s, u=70km/h, v=1.44km/h. The vehicle front and rear tracks are equal to 1.55m. Calculate the value of the vehicle slide slip angle (in degree). Calculate the value of the side slip angle at each wheel centre (in degree). [6 Marks] (e) The steering wheel angle is 80° and the steering ratio is 14. Calculate the slip angle of each wheel in degree). [4 Marks]