Adams Assignments – Problem 4 – Steering geometry 2

OPEN ADAMS CAR<OPEN<ASSEMBLY

in assembly dialogue box,right clcik on the box and choose the database hwere you selcr the assembly,so go to the dfatabase and select the doublewishborne.

intaially run the stimulation,give a name to the output prefix,enter the number of steps to be 500

And enter the steering limit 300/-300 degree.

CASTOR ANGLE:

By changing the castor angle it will affect the steering,more the castor angle heavier the steering effort and more stability.

CASTOR MOMENT ARM:

Change the castor angle to achieve the giving target,the castor trail has to be 21mm.

change the side view outer ball joint to achevev the required castor moment arm.

changing the castor moment arm,can affect the stability of the vehicle

when castor trail increses,the steering effort increases and and it will mask the warning so the driver will not feel the vehicle is going to be skid.

KPI:

Changing the front upper ball joint and lower ball joint can chnge the kingpin inclination.

once changing is done run the stimulation and preprocess the result to actally see that you achueve the given target

hence the given target is achieved.

Increasing the KPI can also increases the steering effort that would make steering more heavy.

STEERING OFFSET:

changing the front upper and lower ball joint can change the lateral steering offset ,so the change the upper and lower ball joint and run the stimulation.

once the stimulation is done,see the result through preprocessing tool to see that we achieve the target.

Changing the steering lateral offset can increases the torque steer.so inorder to decreases the torque steer we need to reduce the lateral offset.

STEERING OFFSET LONGITUDINAL:

Same thing in the side view changing the upper and lower ball joint can chane the longitudinal steering offset,make the castor angle zero that would make the longitudinal steering offset zero this is what the target is,we need to achieve zero longitudinal steering offset.

once the changes as be done run the stimulation and check with the preprocessing tool.

SCRUB RADIUS:

scrub radius can be changed by changing the ball joints(upper and lower),it is the distance betwwen the wheelcentre contact patch to the axis which made by joing the two ball joints.

change the ball joints to achieve the given target,which is 20mm.

once the changes is done run the stimulation and preprocess the result.

scrub can have a effect on the wheel grips,higher the scrub ,more the grip and more the tire wear.