playground:playground
This is an old revision of the document!
Table of Contents
PlayGround
Towards a SPACAR implementation with a gradual learning curve
Key ideas
Conceptually
- goal: get second-year bachelor students to analyse 3-D static flexure mechanisms, within a day after first encounter
- provide a set of MATLAB functions for completely defining a model, running a simulation, and processing results (reasoning: force user to (think) make a drawing first | avoid looking like CAD software)
- focus on easy syntax
- do not expose the user to “unnecessary” features
Practicalities
- instructions are largely a set of relevant example models
- implementable within a week (including lecture/tutorial preparation)
- code that is easy to maintain and update
- some degree of backwards “compatibility” (e.g. avoid using the same names for different things, in relation to the existing implementation)
Important topics
- error handling
- model definition
- available simulation results
- visualization tool
Suggestion of workflow and syntax
Pre-processing step
Analysis step
Post-processing step
List of tasks/technical challenges
FORTRAN/C++
- Spadraw
- silent mode/automatic loadsbd call
- data file to MATLAB structure
- error/warning codes (to provide to MATLAB and link to the wiki)
- orde 0 convergence
- element length too small
- incorrect local y vector
- NaN in dat file
- filename length
- singular mass or stiffness matrix
A single static mode (instead of modes 7, 8, 9)
Spavisual that always visualizes the (possibly incomplete) model
- show boundary conditions — to make debugging (also for instructors) easier
- visualize overconstraint deformation modes — to make allocating releases easier
Moments and angles without hinges
playground/playground.1496917184.txt.gz · Last modified: 2017/06/08 12:19 by marijn.nijenhuis
