5: CAD Design Principles for Electric Vehicles

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Questions and Answers

What major function does the drivetrain serve in the model?

  • It supports the vehicle's bodywork.
  • It regulates the steering system.
  • It houses the electronics.
  • It connects the electric motor to the wheels. (correct)

Which of the following parts is NOT indicated in the motor shaft assembly?

  • Differential drive
  • Coupling motor - shaft
  • Gears
  • Suspension (correct)

In the modeling operations mentioned, which sequence is least effective for creating complex part features?

  • Extrudes only
  • Extrudes and then adds features
  • Combination of both methods
  • Revolve only (correct)

What is the primary goal of 'Design-by-Features' in engineering geometry?

<p>To first define the basic shape and then add features. (D)</p> Signup and view all the answers

Which of the following components is responsible for transmitting power from the motor to the wheels?

<p>Drive shaft (D)</p> Signup and view all the answers

In terms of engineering design, how are features typically added after defining the shape?

<p>By applying design rules and constraints. (D)</p> Signup and view all the answers

Which of the following is a learning objective stated for the engineering design course?

<p>Understanding what part families are and their applications (B)</p> Signup and view all the answers

What is one of the basic feature types students will learn about in CAD systems?

<p>Extrusions (D)</p> Signup and view all the answers

What is the focus of the course in the Engineering Design + Computing Laboratory?

<p>Parametric modeling and efficient design processes (D)</p> Signup and view all the answers

Which alteration in CAD modeling steps could produce the object displayed in the bottom view?

<p>Changing the sequence in which steps are applied (B)</p> Signup and view all the answers

What impact does changing the parameters of a modeling step have on the final object?

<p>It may alter the size or shape of the feature (B)</p> Signup and view all the answers

If the 'hole' step is executed before the 'shell' step, what is likely the result?

<p>The model may not retain the original shape (B)</p> Signup and view all the answers

What process can help in visualizing the effect of each modeling step in CAD?

<p>Using a feature tree to trace modifications (D)</p> Signup and view all the answers

What is the primary reason for using a 'pattern' step in CAD modeling?

<p>To replicate features efficiently (A)</p> Signup and view all the answers

When would it be most beneficial to replace a modeling step in CAD?

<p>When the current step does not fit the overall design intent (A)</p> Signup and view all the answers

What could be a consequence of applying features in the incorrect order?

<p>The model might lose its operational functionality (C)</p> Signup and view all the answers

Why is it important to understand the interaction of modeling steps in CAD?

<p>To ensure the design meets all technical requirements (B)</p> Signup and view all the answers

What is a characteristic of profile tolerance in assembly features?

<p>The actual surface must be within a tolerance zone. (B)</p> Signup and view all the answers

What does a co-axial assembly feature involve?

<p>Components aligned along a central axis. (C)</p> Signup and view all the answers

Which shape is used to describe the termination of an extrusion as shown in the feature verification process?

<p>Round (C)</p> Signup and view all the answers

Which statement best describes overlapping fillet and round features?

<p>They represent different methods of terminating edges. (B)</p> Signup and view all the answers

What is meant by 'model history' in design verification?

<p>The sequence of actions undertaken during the design process. (D)</p> Signup and view all the answers

What role does a sketch play in the extrusion model history?

<p>It outlines the initial shape before extrusion. (D)</p> Signup and view all the answers

What is the purpose of edge blending in model history?

<p>To transition between adjoining surfaces smoothly. (C)</p> Signup and view all the answers

What does the term 'termination' refer to in feature verification?

<p>The end point of an extruded feature. (C)</p> Signup and view all the answers

What is the first step in creating a parametric model?

<p>Define Rough Geometry and Parameters (D)</p> Signup and view all the answers

Which action is performed to modify an existing parametric model?

<p>Removing a geometric constraint (D)</p> Signup and view all the answers

What would happen if the relation p0 = 90mm is replaced with p0 = p1 + 10mm?

<p>The system would solve the constraints and update the model (C)</p> Signup and view all the answers

What does a parametric relation typically define in a model?

<p>Linkages between geometric entities (C)</p> Signup and view all the answers

Which of the following is NOT a typical operation when handling constraints in parametric modeling?

<p>Define Material Properties (C)</p> Signup and view all the answers

What is indicated by the relation R = b/2 in parametric modeling?

<p>R is dependent on the value of b (A)</p> Signup and view all the answers

What is the purpose of geometric constraints in a parametric model?

<p>To define relationships between geometric entities (B)</p> Signup and view all the answers

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Study Notes

Learning Objectives

  • Students will learn to think about design parametrically in CAD systems.
  • Students will understand the concept of a feature, basic feature types and their properties.
  • Students will understand what part families are and how they are used.
  • Students will be introduced to Additive Manufacturing (3D Printing).

CAD Model of the PLUS II

  • PLUS II is an electric vehicle
  • Made of several components including chassis, bodywork, windshield, electronics, door, steering system, front wheels, drivetrain, back wheels
  • Example of CAD model used to design these components

Drivetrain

  • Example component of PLUS II
  • Composed of electric motor, wheel, suspension

Example part from Kyburz: Motor Shaft

  • Motor shaft is an example of design using CAD features
  • The motor shaft is broken into various parts with different function and material properties
  • Parts are indicated by different colours eg, orange - bearings, green-sealings, blue-drive shaft, pink-coupling motor, red-differential drive, grey-gears, transmission
  • Drivetrain is a key component of electric vehicles.

Question: Modeling operations

  • The question asks about the best way to represent the basic shape of a part in CAD, using geometric modelling operations
  • The options are either 1. Extrusions only, or 2. Revolves only

How can we encode the engineering meaning of geometry?

  • CAD features can be used to encode engineering meaning of geometry
  • This is referred to as "Design-by-Features"
  • This makes designing easier to understand, manage and modify
  • Example of this is in the design of a gear
  • A gear is a complex shape, with many features such as key seat, chamfer, centre hole, locking pattern, groove
  • Features are built up on top of basic geometry to create complex shapes
  • Example of features: chamfer, round, mirror geometry

Assembly and Tolerance Features

  • Assembly features allow parts to be assembled and constrained in CAD software
  • Example of assembly feature - co-axial assembly features, where parts are aligned and attached to each other
  • Tolerance features are used to control dimensional accuracy of parts
  • Tolerance features ensure that a part is within specified limits
  • Example - profile tolerance feature

Feature Verification

  • Feature verification is important to ensure CAD features work as intended
  • Features can sometimes interact with each other, creating unexpected geometry
  • Example - fillet and round feature, where the round overwrites the fillet
  • Model History can show how a model was created
  • History can show a breakdown of the features used to create the model

History Dependency and Interaction

  • CAD models have 'history' meaning they remember how they were created
  • History can be used to modify a model easily
  • Changes to a model can have cascading effects on other features
  • Example: modifying a hole feature can affect a pattern or shell

Question: Alternative Model

  • This question asks about modifying a sequence of modelling steps in CAD
  • Modifying the sequence of steps can change the outcome of a design
  • Example - switching the order of 'shell' and 'hole' operations can create a different result

Sketch and Parametric Modeling Overview

  • Parametric modeling allows for flexible and dynamic design
  • Parametric modelling uses constraints and parameters to define geometry
  • The relationships and constraints define how geometry should behave
  • The model automatically updates when parameters change
  • Example: changing the length of a line can affect the position of other geometric entities

Question: Parametric Modeling

  • This question asks about how a parametric model responds to changing its parameters
  • Changing parameters can change the model because of defined relationships
  • The constraint solver will find the new solution and update the model accordingly

How to Create a Parametric Model

  • Parametric models are created by linking geometric entities using parameters and constraints.
  • Constraints define relationships between different geometric entities in a CAD model.
  • Example constraints include:
    • Lines parallel to lines
    • Lines perpendicular to lines
    • Circles tangential to lines or other circles
    • Points constrained to a specific location.
  • Parameters are used to define specific values for the constraints.
  • Example parameters include:
    • Angles
    • Lengths
    • Radii.

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