Feedback for "fix123" - mkraska/meclib GitHub Wiki
fb_fix123(o, n, i, description)
[txt, isOK]: txt
feedback textisOK
correctness flago
list of objectsn
names fieldi
index of "fix123" objectdescription
string with Text to identify the object for the user
fb_fix123_name(o, n, i)
[txt, isOK]: txt
feedback textisOK
correctness flago
list of objectsn
names fieldi
index of "fix123" object
Requires: fb_force_hvxy, function for detailled feedback on force names.
These functions provide Feedback for Free Body Diagrams.
"fix123" is a built-in support with no degree of freedom. It is to be replaced by two reaction forces and a moment.
Checks done by fb_fix123()
:
- Is the object really of type "fix123" (just for developers)?
- Is the object deactivated?
- Has meclib found any reactions by proximity check?
- Are there exactly three reactions?
- Are two reactions of type "force" and one of type "moment"?
- Are the two forces non-parallel?
Checks done by fb_fix123_names()
:
- Do the names of the reactions match the name of the support point?
- For force reactions
- Is there a direction index?
- Is the index a single character?
- Is the index one of x, y, h(orizontal), v(ertical)?
- Does the index match the actual direction?
- For moment reactions:
- Is the base name equal to
M
? - Does the index match the support name?
- Is the base name equal to
Example question: FBD Tutorial Einspannung (I) at abacus.aalto.fi/develop/4.4beta
Typical PRT
Feedback variables:
obj: stackjson_parse(objects);
[text, isOK]: fb_fix123(obj, names, i_fix123, "Einspannung bei B: ");
[ntext, nOK]: fb_fix123_name(obj, names, i_fix123);
PRT node 1 test for correct direction
Algebraic test for isOK = true
and feedback of {@text@}
for both branches.
PRT node 2 test for correct name
Algebraic test for nOK = true
and feedback of {@ntext@}
in the false
branch (with penalty of 0.5).