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Simulation Based Design Study of the Smart Cart

Simulation Based Design Study of the Smart Cart

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Simulation Based Design Study of the Smart Cart

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  1. Simulation Based Design Study of the Smart Cart ME 6105: Modeling & Simulation Dr. Chris Paredis Harjot Hayer Daniel Lai Laura Raibeck

  2. What is the Smart Cart? Motivation: • Harjot’s Senior Design Project Brief Description: • Modeled after a Hydraulic Scissor Lift • Main Objective was to Lift 150 lbs, and to Load onto a Vehicle through a 4-Step Process 1 2 3 4 Smart Cart Video

  3. Project Overview Goals of the Design Study: • Maximize Usability • Minimize Energy Consumption • Maximize Performance Design Variables for Study: • Size of hydraulic cylinder • Input Voltage • Hydraulic configuration Measures of Effectiveness: • Time to reach height of 1m • Energy Consumption (W)

  4. Dymola Models Scissor Lift Models (1)

  5. Dymola Models Cont. Scissor Lift Models (2)

  6. Dymola Models Cont. Hydraulic Model

  7. Dymola Models Cont. Complete Model

  8. Interesting Results 1. Uncertain Variables were Analyzed in ModelCenter 2. = BAD

  9. Problems Encountered • Original Design Study • Geometry as a Design Variable • Goals Related to Payload • Scope of study too large • Planar Loops/Singularities! • Knowledge of Hydraulics • Changing one variable in many places • Geometries for all links • Friction in joints

  10. What We Learned • How to Use Dymola – Steep Learning Curve • Organized models are easier to use • ModelCenter • Modeling preferences is difficult • Dealing with uncertainty • Don’t leave hydraulics for last