Assignment 3 Instructions

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University of Ontario Institute of Technology *

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3030U

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Mechanical Engineering

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Jan 9, 2024

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docx

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5

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MECE 3030U Computer Aided Design Assignment 3 Due: December 4, 2023 For the handwritten questions in this assignment, please show your calculations using pencil/pen and paper and draw a box around your final answer. Please use only a simple calculator to complete these questions (as you would for an exam). MATLAB can be used to verify your answers but not to demonstrate your ability to solve the assignment questions. For NX-based questions, please include a .zip file that includes all the files required to open your parts, assembly, motion analysis and finite element analysis. Please upload your assignment (one .zip file containing a single pdf of your handwritten solutions and all the NX files required to validate your work) by the due date. Question 1 A. (10 marks) For the control points and weights below, find the parametric equation and the curve’s coordinates at u = 0, u = 0.3, u = 0.7, u = 1, for a Non-Uniform Rational B-Spline of degree 2: P 1 = [-1, -1] T , P 2 = [0, 3] T , P 3 = [3, 0] T , P 4 = [-2, -2] T w 1 = 1, w 2 = 3, w 3 = 1, w 4 = 1 B. (10 marks) Sketch the NURBS curve and label the tangent vectors at the beginning and end of the curve. Sketch a Bezier Curve that utilizes the same control points. Describe why the Bezier Curve is a special case of a NURBS curve (<50 words). Question 2 A. (10 marks) A designer selects the following control points to create parametric curves for the front and back of a new car hood. Compute the Bezier Surface equation, P(u,v), that generates the new car hood from the following control points: Front of Hood: P 1 = [-1, -1, 2] T , P 2 = [0, -2, 3] T , P 3 = [1, -1, 2] T Back of Hood: P 4 = [-1, 0, -2] T , P 5 = [0, 1, -1] T , P 6 = [1, 0, -2] T B. (10 marks) Describe and sketch which parameters the designer would need to provide to create a similar surface using the Hermite Bicubic Surface approach (<100 words).
Question 3 A. (10 marks) A human loads a truss structure with a force F H , as shown below. Create the stiffness matrix and create a matrix equation to calculate the reaction forces and node displacements. Assume an elastic modulus of E, element area of A, and element lengths of b and a. Question 4 The lift gate for a redesigned sport utility vehicle is being developed based on a previous model: Hyundai Lift Gate Video: https://www.youtube.com/watch?v=_hbe7WidJqc The designed components are attached in the .zip file. Your challenge is to use Siemens NX software to develop a stylish trunk cover using a parametric curve (Studio Spline), and create an assembly, motion analysis, and finite element analysis for the system to determine the system’s range of motion and the trunk frame’s structural integrity. A. (20 marks) Create a stylish trunk cover, example above, that utilizes Studio Spline parametric curves (in addition to standard lines and arcs) and that mounts to the M5 bolt hole locations on the trunk’s frame (hint: you can start from a duplicate of the trunk frame part to create your cover). Create an assembly for the lift gate system shown above and incorporate your trunk cover. Find a suitable bump stop thickness so the car frame and trunk frame stop when parallel (round to whole numbers). Remodel the car frame part with the correct bump stop thickness. On your handwritten solutions sheet, state the correct bump stop thickness. Example Trunk Cover Bump Stops
B. (20 marks) Create a motion analysis showing the trunk opening and closing at 20 o /s, using the actuator as the motion driver. On your handwritten solutions sheet, state your method for controlling the actuator’s motion. Create a motion analysis with a force driver for the actuator. Determine the force required to lift your trunk frame and cover. Ensure your analysis has gravity enabled. Assume your trunk frame and trunk cover are made from Aluminum 6061. On your handwritten solutions sheet, state the force required to lift your trunk. C. (10 marks) Create a finite element analysis for the car frame to analyze the force of the actuators on their ball joints. Determine the maximum stress on the car frame and if the car frame will yield. Modify the car frame to better distribute loads from the actuator. On your handwritten solutions sheet, state the maximum stress and if your car frame will yield. Explain the geometric changes and feature additions you made to the car frame (<100 words). Your final assignment for CAD, woohoo! Please reach out for support if desired. Good luck and enjoy the process, Aaron
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