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ME 115: Dynamics of Machinery. Manuel Leija Christian Reyes. Professor Granda. Please use this power point to do the grading on. This is a new revised one, the other one was an uncorrected file. Vehicle to Vehicle Collision. Vehicle collisions cause injuries and irreparable damage

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me 115 dynamics of machinery

ME 115: Dynamics of Machinery

Manuel Leija

Christian Reyes

professor granda
Professor Granda
  • Please use this power point to do the grading on. This is a new revised one, the other one was an uncorrected file.
vehicle to vehicle collision
Vehicle to Vehicle Collision
  • Vehicle collisions cause injuries and irreparable damage
  • In order to analyze the effects of the collisions so as to reduce injuries, three dimensional dynamics and computer simulation programs are necessary
problem statement
Problem Statement
  • If a truck runs a stop sign at a constant velocity and then suddenly collides with another car also traveling at a constant velocity, what are the effects on both vehicles
  • What is transferred through the collision and through which dynamic principles allows this transfer to occur?
vehicle information
Vehicle Information
  • Truck Data:
    • Weight = 2900 lb
    • Velocity = 45 mph (792 in/s)
    • Coefficient of Restitution =0 (perfectly plastic)
  • Car Data:
    • Weight = 2200 lb
    • Velocity = 25 mph (440 in/s)
    • Coefficient of Restitution = 0 (perfectly plastic)
equations 2d
Equations: 2D
  • Truck: x = xo + v*t
    • Solved for time to collide with Truck using xo = 0 and x = 50 ft, and constant velocity vA = 25 mph (440 in/s)
    • Truck can start anywhere from 990 to 1350 ft. in the y-direction of it’s starting point to ensure a collision
  • Car: (x – xo)B = vB*tA = (vB/vA)(x – xo)A
    • Solved distance that would cause collision using Car A as reference with xoB = 0 at vB = 45 mph (792 in/s)
    • Car can start anywhere from -33 to 170 ft. in the x-direction of it’s starting point to ensure a collision
other general equations 2d
Other General Equations: 2D
  • Kinematics of Rigid Bodies
  • Position Analysis, Translation, Rotation
  • Kinetics of Rigid Bodies
  • General Plane Motion
  • Momentum and Impulse
  • Conservation of Energy
nastran 4d
Nastran 4D
  • Three dimensional kinematic and dynamic analysis made easy.
  • Similar scenario with only two vehicles.
  • Two different situations:
    • Unrealistic (frictionless surface)
    • Realistic (with friction)
learning experience
Learning Experience
  • How to use modeling programs to simulate real life situations.
  • Use analytical techniques from class for solving problems.
  • Despite what most car manufacturers say, truth be told, do not roll your car!!!! 
  • It’s not just the car itself that damages the vehicle, but the transferred energy from the striking vehicle as well.
  • It’s all about the impulse and momentum principal!!