Car Rolling 101Car Rolling 101Beaudy ShecklerBeaudy Sheckler

Jeff PowersJeff PowersME 115ME 115

Professor GrandaProfessor Granda

The Purpose…The Purpose…

►The Purpose of the project was to The Purpose of the project was to construct a life-like simulation of a 3-D construct a life-like simulation of a 3-D person in a rolling vehicle.person in a rolling vehicle.

The Plan…The Plan…

►Make a model of a mid-sized sedan Make a model of a mid-sized sedan using solid works.using solid works.

► Import this model into Nastran 4-D for Import this model into Nastran 4-D for analysis on car body.analysis on car body.

►Construct a person (female) to drive Construct a person (female) to drive the sedan in solid works.the sedan in solid works.

►Place the person in the car and Place the person in the car and analyze the forces experienced by her.analyze the forces experienced by her.

Revisions…Revisions…

► Initially, a lotus Elise was constructed Initially, a lotus Elise was constructed and used for the model, but after long and used for the model, but after long compilation time due to filets and compilation time due to filets and realistic suspension, the model was realistic suspension, the model was simplified to a sedan.simplified to a sedan.

►The initial crash dummy was a male, The initial crash dummy was a male, but due to size constrictions, could not but due to size constrictions, could not fit in the vehicle.fit in the vehicle.

Implementation…Implementation…

►Knowing the solid works applications, Knowing the solid works applications, a sedan was constructed through a a sedan was constructed through a series of cuts and extrusions. series of cuts and extrusions.

►The female driver was made through a The female driver was made through a series of mates and constraints on series of mates and constraints on cylinders and spheres.cylinders and spheres.

►The files were opened in Nastran 4-D The files were opened in Nastran 4-D and constraints were re-applied.and constraints were re-applied.

The Simulation…The Simulation…► Initially we tested the effects of a car Initially we tested the effects of a car

landing on it’s roof in Working Model 2Dlanding on it’s roof in Working Model 2D►A series of Nastran constraints A series of Nastran constraints

composed the sedan’s suspension, and composed the sedan’s suspension, and the female “dummy’s” joints were the female “dummy’s” joints were modeled after rudimentary human modeled after rudimentary human anatomy, wearing a lap belt.anatomy, wearing a lap belt.

►After finalizing the drawings and After finalizing the drawings and constraints, the real world properties constraints, the real world properties were applied (ie: 9.81 m/s*s for gravity, were applied (ie: 9.81 m/s*s for gravity, collision, material properties, etc.)collision, material properties, etc.)

Working Model 2DWorking Model 2D

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Working Model 2DWorking Model 2D

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Results…Results…

After hours of rendering, the final After hours of rendering, the final simulation shows the impact on the simulation shows the impact on the human as the sedan rolls over.human as the sedan rolls over.

The sedan was traveling approximately The sedan was traveling approximately 60 mph, when it hits the slanted curb 60 mph, when it hits the slanted curb at a 45 degree angle. at a 45 degree angle.

The impact broke the suspension and The impact broke the suspension and lost the rear left tire as a result.lost the rear left tire as a result.

Ariel Shot of Flipping…Ariel Shot of Flipping…

Right Side View of flipping…Right Side View of flipping…

Collision Close-up…Collision Close-up…

Wide Angle Finale…Wide Angle Finale…

Front View of flipping…Front View of flipping…

Sedan Body Acceleration Sedan Body Acceleration Graph…Graph…

Impulse Between Dummy and Impulse Between Dummy and Sedan…Sedan…

Sedan Removed…Sedan Removed…

Person Contact Impulse…Person Contact Impulse…

Front View…Front View…

High Quality Front View…High Quality Front View…

Rag doll effect…Rag doll effect…

Questions?Questions?

►For any assistance, please raise your For any assistance, please raise your hand and your question(s) will be hand and your question(s) will be addressed in the order of relevance.addressed in the order of relevance.

►(Decisions of relevance will be (Decisions of relevance will be determined by group members)determined by group members)