Table of Contents

2021.06.07 - Initial Brainstorming Meeting with Tommy

Expand

Meeting Agenda:

Strategies
1. How to be a good mech member :^)
2. Engineering Design Process
Mechanical Design Stages
Timelines

Strategies:

Mech member = designer
- they’re in charge of research and decision making
- mech leads help with providing advice, intuition, and strategies for solving complicated problems
  - also useful for giving shortcuts, resources, or tips in finding those solutions
Do good research and documentation; keep it organized!
- this is useful for presentation, communication, review, and for other people to give you suggestions
Engineering Design Process!!!
- it’s a logical way to gather information and understand how you should
  - reach conclusions
  - communicate to others
  - see the impact of your work on the final product and stakeholders
- ENGR100 - Alfano (Old/2014 Lectures) - YouTube
  - just look at slides
  - try to use the strategies that are suggested :^) they are logical and organized
  - Bend Fixture Design Project - Mechanical - Confluence (atlassian.net)
    - work term report example for bend fixture
    - includes problem definition, concept design, first iteration of detailed design, and some FEA

Mechanical Design Stages

Problem Definition
- Stakeholders
  - People who are involved with your project or interested in your project
    - Other people in the car assembly
    - Mentors / reviewers
- Design Requirements
  - Nonfunctional
  - Functional
  - Criteria
  - Constraints
    - **should note loading conditions that you expect and justify them
- Engineering Design Specification
Conceptual Design
- Concept Ideation
  - Morphological Design Table
- Concept Evaluation
  - Numerical Evaluation Matrix
Detailed Design (Mechanical)
- *** branch out if necessary for each sub-component of your assembly if applicable
- Material Selection
- Geometry
- Hand Calculations
  - Solid Mechanics I | Engineering Core Courses
    - Only go up to ch 6
  - The Efficient Engineer - YouTube
  - Google and understand the concept of Safety Factor
- Simulations
  - Resources on Confluence
Design for Manufacturing and Assembly (DFMA)
- How Things Are Made | An Animated Introduction to Manufacturing Processes - YouTube
- Drawings
  - GD&T - GD&T Symbols | GD&T Basics (gdandtbasics.com)
- Supplier Interfacing + Inventory
  - Bill Materials
- Manufacturing Plan
- Fabrication + Assembly
Prototyping (Small Scale or Scaled Down)
- try to make it cost-effective

Timelines

We will install the trunk latch in Spring 2022 at the latest.
Concept Design = 1 month
Detailed Design = 1.5 month
DFMA = 0.5 month
Installation = 1 week (whenever it will be installed)

Resources

2020/2021 American Solar Challenge Regulations | American Solar Challenge
- read through this and take screenshots of relevant rules into your documentation

Problem: Designing and integrating a trunk latch.

Stakeholders: Mr. Tran, and Aerobody and Trunk teams.

Design Requirements [Qualitative]: lightweight, smaller (but still easily accessible & usable), sturdy, creates a seal, little to no intrusive integration required for implementation, and doesn’t open without human interaction.

Latch Types Considered: deadbolt, key, hook, buckle, toggle, and slide bolt.

Internal Lock Types Considered: cam lock and rotary. (not all Latch Types require an Internal Lock)

Specifics to Consider: the constant force of trunk spring (unknown) and consistent strain of car use (i.e. bumpy roads jostling the latch; unknown).

Pros and Cons of Latch Types:

	Pros	Cons
Deadbolt	Easy to use, sturdy	Heavier, larger, intrusive integration, harder to implement, not totally trustworthy without stopping mechanism, harder to manufacture
Key	Lighter, sturdy, smaller, trustworthy	Intrusive integration, harder to implement, harder to manufacture
Hook	Lighter, smaller, non-intrusive, easy to use, easy to manufacture, easy to implement	Not sturdy, not trustworthy, no seal (unless well made)
Buckle	Easiest to use (hands off), sturdy, easy to manufacture, easy to implement	Larger, heavier, intrusive integration
Toggle	Smaller, lighter, non-intrusive, easy to implement	Not sturdy, harder to manufacture
Slide Bolt	Easy to use, lighter, smaller, easy to implement, non-intrusive	Not sturdy or trustworthy without stopping mechanism, harder to manufacture

some traits were neither pro nor con since they would depend on the design and manufacturing quality *

Conceptual

Latch Designs:

Simple key and cam lock - keyhole integrated into the trunk back wall, receiver on the closed trunk lid lip above it, hook-based twist lock, cylindrical key
Buckle lock (think a seatbelt) - release integrated into the back wall, buckle attached to the lid lip, simple button release (like a seatbelt), automatic lock
Toggle latch - latch attached to the back wall, receiver attached to the lid lip, simple toggle latch
Slide Bolt - receiver attached to the back wall, bolt attached to the lid lip, spring-based stopping mechanism, simple push release, automatic lock

sketches to follow *

Conceptual Design Specifics:

	Automatic?	Receiver Idea	Input Idea	Stability	Machinable In-House	Receiver Integration Method	Input Integration Method
Key	No		Image RemovedImage Added	First	Probably, depending on design	Adhered to the inside of the lid lip	Inserted into the back wall
Buckle	Yes			Second	Probably, depending on design	Inserted into the back wall	Adhered to the inside of the lid lip
Toggle	No			Fourth	Not completely	Adhered to the outside of the back wall	Adhered to the outside of the lid lip
Slide	Yes	Image not found, similar concept to the buckle receiver	I couldn’t find a correct image, so just imagine it permanently stationary	Third	Probably, depending on design	Adhered to the outside of the back wall	Adhered to the outside of the lid lip