Adams Assignments – Problem 5 – Compliance
Open the ADAMS CAR<FILE<OPEN<ASSEMBLY,open the multilink suspension
once the assembly is opened start the stimulation
we use static load stimukation
give the outprefix to the stimulation and mode of stimulation is interactive
give the bracking force and tractive force as per the stimulation
first we go with the braking force to find braking steer and longitudinal wheel centre recession during braking.
once the stimualtion is done go to the preprocessing to establish the result.
brake steer:
brake steer is plotted between toe angle vs wheel base travel(deg/mm)
toe out during braking(0.16deg/mm) which is 160deg/m,hence the car oversteer.
traction steer:
traction steer is plotted between toe angle vs wheel longitudinal trevel base
traction steer=0.016deg/mm(16deg/m)
the car toe out during braking hence the car oversteer.
longirtudinal wheel centre recession (during traction):
longirtudinal wheel centre recession during traction is plotted between wheel travel base and wheel load longitudinal driving.
longirtudinal wheel centre recession (during braking):
lateral force compliance steer:
lateral force compliance steer is plotted between toe angle vs lateral wheel load lateral.
the tire will toe out so the there will be oversteer in the rear wheel.1.68*10^-4 which is 0.168deg/kn.
lateral force complaince camber:
-4.068*10^-4deg/mm which is 0.406deg/m,thw wheel is geting negative camber so the wheel will be oversteer.
bump steer:
it means the wheel toe out during bump,1.6deg/m.the wheel will go toe out ,hence the wheel will be oversteer.
TUNING:
tuning the bump steer to achieve the target which is +2.6deg/m.we achieve by changing the hardpoints of the hpl_tl.
once change is dione run the bump stimulation and compare with the previous stimulation.
we got +2.6deg/m where the wheel go to toe in which makes the rear wheel to understeer.
basline stiffness is 953N/mm.now achieve the target by changing the bushing material.
now the stiffness is 458N/mm.
CAMBER COMPLAINCE:
