TinyG _get_target_length() help

Started by leeson on Mar 20, 2013 in TinyG Projects. 3 replies, last activity Mar 21, 2013.

leeson Mar 20, 2013 #3891

Hi Guys,

First, thanks for all the hard work on this project!

L = (Vt-Vi) * T - (Ar*T^2)/2

why L is not L = Vi * T + (Ar*T^2)/2 ?

thanks!

leeson Mar 20, 2013 #3892

|
|
| Vt_______________________________
|xxxxxxxx/>
|xxxxxxx/>>
|xxxxxx/>>>
|xxxxx/--------------------Ar
|xxxx/>>>>>
|xxx/>>>>>>
|xx/>>>>>>>
|x/>>>>>>>>
|/>>>>>>>>>
Vi|>>>>>>>>>>
|>>>>>>>>>>
|>>>>>>>>>>
|>>>>>>>>>>__________________________________
T

the 'x' region L=(Vt-Vi)*T -Ar*T^2/2;
the '>' region L=Vi*T+Ar*T^2/2;

i think the L should be '>' region,and why 'x'region.
thanks for help.

leeson Mar 21, 2013 #3902

|
|
| Vt_______________________________
|xxxxxxxx/> \
|xxxxxxx/>> \
|xxxxxx/>>> \
|xxxxx/--------------------Ar \
|xxxx/>>>>> \
|xxx/>>>>>> \
|xx/>>>>>>> \
|x/>>>>>>>>...................................... V_exit
|/>>>>>>>>>......................................
Vi|>>>>>>>>>>
|>>>>>>>>>>
|>>>>>>>>>>
|>>>>>>>>>>__________________________________
T

the 'x' region L=(Vt-Vi)*T -Ar*T^2/2;
the '>' region L=Vi*T+Ar*T^2/2; or L=(Vt-Vi)*T -Ar*T^2/2 + Vi*T;

i think the L should be '>' region,and why 'x'region?

aldenSynthetos Mar 21, 2013 #3903

Thanks for pointing this out. We've been looking at your math to see how it affects things. We'll post later.

Alden

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