suspension analysis using msc adams
DESCRIPTION
Suspension Analysis using MSC AdamsTRANSCRIPT
Suspension Analysis using MSC Adams
The analysis of the suspension characteristics of the DICV NR-XIII was carried out on MSC Adams to verify the expected behaviour of the car according to the design. The accuracy of this analysis was validated using Lotus Shark.
Process flow of analysis on MSC Adams:
Obtain Template Download of template from MSC Knowledge baseObtaining database: fsae_2008r1_MDR3.cdb
Opening Database Addition of obtained database to current session
Front Suspension The front suspension assembly is loaded from the databaseDisabling of anti roll bar aspect of assembly
Hard points Setting of originAdjusting of hardpoints from the table view
Setting Suspension parameters
Wheel base: 1600 mm Sprung mass: 270 kgWheel mass: 10 kgBrake ratio: 65%Drive Ratio: 100%
Setting toe and camber Camber: -1 degreesToe: 0 degrees
The above process is repeated for the rear suspension and the graphs are obtained.
Front Suspension:
SpringPlot Spring characteristic curveSet preload
Tire DataEnter tire stiffness and unloaded radiusAlternatively load property file
Parallel Wheel Travel Analysis
Setting up analysis parametersBump: 27 mm Rebound: 27mm
Animation Verification of expected behaviour
Post processingLoading of required analysis log filesCreating plots
PlotsLoading of Plot configuratin file from shared directoryInterpretation of obtained graphs
Model Created (MSC Adams):
Isometric Front View
Front View
Hard points Table:
Suspension Parameters:
Animation of Simulation:
Analysis Parameters:
Graphs Obtained:
Camber vs Wheel travel:
Toe angle vs Wheel Travel:
Caster vs Wheel Travel:
Validation (Lotus Shark):
Model:
Graphs:
Camber vs Wheel Travel:
Toe Angle vs Wheel Travel:
Caster vs Wheel Travel:
Rear Suspension
Model Created (MSC Adams):
Front isometric view
Front view
Hardpoints Table:
Suspension Parameters:
Animation of Simulation:
Analysis Parameters:
Graphs Obtained:
Camber vs Wheel Travel:
Toe angle vs Wheel Travel:
Validation (Lotus Shark):
Model:
Graphs:
Camber vs Wheel travel:
Toe Angle vs Wheel Travel:
Comment on Graphs obtained:
Parallel wheel travel analysis was performed on the front and rear suspension for three values of brake ratios : 55 60 65. As expected, brake ratio did not affect the variation of the suspension characteristics, witnessed by the overlapping graphs obtained.
The suspension behaves as expected and meets the expectations set during the design stage. Thus the design can be promoted to the manufacturing stage.
Conclusion:
Parallel wheel travel analysis was done for the proposed design on MSC Adams using the bump and rebound values for which the suspension is designed. The accuracy of this analysis was validated by performing the same on Lotus Shark. The above designs for the front and rear suspensions meet the design criteria and can be incorporated into the final vehicle.
Credits:
Dayasagar
Jim Harris
Rakshith
Prajwal MP