22 - MSC.Software VPD Conference | July 17-19, 2006 |...

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Unformatted text preview: MSC.Software VPD Conference | July 17-19, 2006 | Huntington Beach, California Suspension Geometry Sensitivity Analysis using Adams/Insight Karthik Krishnan & Dr. Patrick Fitzhorn, Colorado State University MSC.Software VPD Conference | July 17-19, 2006 | Huntington Beach, California Introduction Insert Logo & Delete Box • There are inherent errors in measuring suspension geometry. • The objective is to find out how the variations in these measurements affect camber, toe and caster • Adams/Insight’s DOE capabilities help in characterizing the variability and the effects on suspension response 2 MSC.Software VPD Conference | July 17-19, 2006 | Huntington Beach, California Suspension types this analysis : Insert Logo & Delete Box • There were two types of Front and Rear Suspension chosen for • McPherson Strut suspension (Front) • SLA suspension (Front and Rear) • Multi-link suspension (Front) 3 MSC.Software VPD Conference | July 17-19, 2006 | Huntington Beach, California Cars Used testing Insert Logo & Delete Box • Mitsubishi Lancer Evolution 8 : This is a street car used for track • Ford RS200 : A group B rally car made in the late 1980s 4 MSC.Software VPD Conference | July 17-19, 2006 | Huntington Beach, California Evo Insert Logo & Delete Box 5 MSC.Software VPD Conference | July 17-19, 2006 | Huntington Beach, California Measurement Methods • • • • Error <= 1/16th inch Insert Logo & Delete Box Initial measurements were taken using tape measure and strings The measurement process was then improved using Lasers Error <= 1/32nd inch 6 MSC.Software VPD Conference | July 17-19, 2006 | Huntington Beach, California Suspension Modeling • • • • Adams/Car was used to create the suspension model Insert Logo & Delete Box Hardpoints from the measurements entered into Adams/Car Opposite Wheel Travel Analysis run Displacement : 1.5 inches in each Bump and Rebound 7 MSC.Software VPD Conference | July 17-19, 2006 | Huntington Beach, California Adams/Insight DOE Insert Logo & Delete Box • The experiment was created and exported to Adams/Insight • Each point on the geometry was set to vary independently in X,Y and Z 8 MSC.Software VPD Conference | July 17-19, 2006 | Huntington Beach, California DOE Design Specification Insert Logo & Delete Box 9 MSC.Software VPD Conference | July 17-19, 2006 | Huntington Beach, California DOE Results • McPherson Strut (Front) Suspension Geometry Hardpoint LCA Outer LCA Front LCA Rear Strut Upper Strut Lower Tierod Inner Tierod Outer Direction and response most affected Z (Toe, Camber, Caster) Z (Toe, Camber, Caster) Z (Caster, Toe, Camber) Y (Camber, Toe) X (Caster) Y (Camber, Caster, Toe) Z (Toe, Camber, Caster) Z (Toe, Camber, Caster) Insert Logo & Delete Box 10 MSC.Software VPD Conference | July 17-19, 2006 | Huntington Beach, California DOE Results • SLA (Front and Rear) Suspension Geometry Hardpoint UCA Front UCA Rear UCA Outer LCA Front LCA Rear LCA Outer Toe Link Inner Toe Link Outer Direction and response most affected Z (Toe, Caster, Camber) Z (Toe, Camber) Y (Caster) Z (Camber, Toe) X (Caster) Z (Caster, Camber, Toe) Z (Camber, Toe, Caster) X (Caster, Toe) Z (Camber) Z (Toe, Camber, Caster) Z (Toe, Camber, Caster) 11 Insert Logo & Delete Box MSC.Software VPD Conference | July 17-19, 2006 | Huntington Beach, California DOE Results • Multi-Link (Rear) Suspension Geometry Hardpoint Trailing Link Inner Trailing Link Outer Toe Link Inner Toe Link Outer Lateral Link Inner Lateral Link Outer UCA Front UCA Rear UCA Outer Direction and response most affected Z (Caster, Toe, Camber) Y (Toe, Camber) Z (Caster) X (Caster, Toe, Camber) Z (Caster, Toe) X (Camber) Z (Toe, Caster, Camber) Z (Caster, Toe) X (Camber) Z (Camber, Caster, Toe) Z (Camber, Toe, Caster) X (Caster, Toe) Z (Camber) 12 Insert Logo & Delete Box MSC.Software VPD Conference | July 17-19, 2006 | Huntington Beach, California Conclusions Insert Logo & Delete Box • Using Adams/Insight to study the suspension geometry sensitivity helps us in identifying and improving measurement accuracy in the areas most needed. • It can also be used to design adjustments into suspension geometry that might be made at different tracks for better handling. 13 MSC.Software VPD Conference | July 17-19, 2006 | Huntington Beach, California Future Work how they affect the response curve as a whole. Insert Logo & Delete Box • Look at interaction between all the geometry hardpoints and see • Refine and improve the current DOE process to create better experiments and obtain a wider range of results 14 MSC.Software VPD Conference | July 17-19, 2006 | Huntington Beach, California Insert Logo & Delete Box Questions ? 15 ...
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