Chief Delphi - your favorite equations for build seasion

Chief Delphi (http://www.chiefdelphi.com/forums/index.php)

- General Forum (http://www.chiefdelphi.com/forums/forumdisplay.php?f=16)

- - your favorite equations for build seasion (http://www.chiefdelphi.com/forums/showthread.php?t=90950)

team 3311

04-02-2011 21:05

your favorite equations for build seasion

Just wanted to know some of your favorite physics and math equasions during build seasions thanks.

mine is pathagriom therom

Taylor

04-02-2011 21:50

Re: your favorite equations for build seasion

One I thought about when I was a Junior in high school
F=ma, right?
Work = Fd, agreed?
So,
work is mad

(This is one of those times I wish the "therefore symbol" was on the keyboard - you know, the three dots that form a triangle.)

apalrd

04-02-2011 21:58

Re: your favorite equations for build seasion

While programming a crab drive back in 2009, the arctangent function was my friend. Then sin and cos became my friends too. Sooo much math in 4-wheel independent steer independent drive crab drives.

tomy	04-02-2011 22:06

Re: your favorite equations for build seasion

so far mine has been nested if statements with nested statements in them

we did this for our arm

3 hours of programing and only 10 lines of code :p

team 3311

04-02-2011 22:11

Re: your favorite equations for build seasion

QUOTE=Taylor;1015838]One I thought about when I was a Junior in high school
F=ma, right?
Work = Fd, agreed?
So,
work is mad

(This is one of those times I wish the "therefore symbol" was on the keyboard - you know, the three dots that form a triangle.)[/quote]

Work is force/distance

don't mean to be rude just wanted to help

jamie_1930

04-02-2011 22:15

Re: your favorite equations for build seasion

How can you go a day through life without using these babies:
-PV=nRT
-sin, cos, tan, sec, csc, cot
-F=ma
-W=FD
-t=Fr
-P=W/T
-All unit conversions (although annoying. All for the metric system say "I")

team 3311

04-02-2011 22:16

Re: your favorite equations for build seasion

Quote:

Originally Posted by team 3311 (Post 1015846)

You are right about the formulas

jamie_1930

04-02-2011 22:18

Re: your favorite equations for build seasion

Quote:

Originally Posted by team 3311 (Post 1015846)

Work is force/distance

don't mean to be rude just wanted to help[/quote]

I don't mean to be correct, but check again
W=Fd

pfreivald

04-02-2011 22:41

Re: your favorite equations for build seasion

(lowercase) tau = I*omega (lowercase)
P = IV

dodar

04-02-2011 22:46

Re: your favorite equations for build seasion

GP + Fun = WIN!!!

Team#2057-Vegas

04-02-2011 23:00

Re: your favorite equations for build seasion

Quote:

Originally Posted by jamie_1930 (Post 1015852)

Work is force/distance

don't mean to be rude just wanted to help

I don't mean to be correct, but check again
W=Fd

its force x distance, he had it right. the full equation is technically F(D)cos(theta)

artdutra04

04-02-2011 23:18

Re: your favorite equations for build seasion

Quote:

Originally Posted by Taylor (Post 1015838)

(This is one of those times I wish the "therefore symbol" was on the keyboard - you know, the three dots that form a triangle.)

You don't have a ∴ key? It's right next to 'Any' key. :p

pfreivald

04-02-2011 23:22

Re: your favorite equations for build seasion

Quote:

Originally Posted by artdutra04 (Post 1015894)

You don't have a ∴ key? It's right next to 'Any' key. :p

...which is right next to the Easy Button...

demosthenes2k8

04-02-2011 23:23

Re: your favorite equations for build seasion

...which is right next to the "compile faster" button...

T = ((et)^5) + 7s

Give up? Hint. et is estimated time, T is actual time. s is the number of times you say it'll be easy.

ajd	04-02-2011 23:27

Re: your favorite equations for build seasion

Quote:

Originally Posted by demosthenes2k8 (Post 1015902)

...which is right next to the "compile faster" button...

T = ((et)^5) + 7s

Give up? Hint. et is estimated time, T is actual time. s is the number of times you say it'll be easy.

So if I say it will take half a minute, then it will actually take one thirty-second of a minute, assuming I don't say it will be easy at all?

ttldomination

04-02-2011 23:29

Re: your favorite equations for build seasion

Idk, but the Law of Cosines has become more sexy than usual...

,4lex S.

04-02-2011 23:37

Re: your favorite equations for build seasion

Internet + Cats = Robot that doesn't work and isn't built.

MarkoRamius1086

04-02-2011 23:38

Re: your favorite equations for build seasion

Most Used: (Machine Shop Algebra for finding the coordinates for paired symmetrical holes on material. With d1 being the material length, d2 being the hole pattern, and x being the distance from the hole center to the edge of the material)
x = (d1/2)-(d2/2) = (d1-d2)/2

Most Reliable: Newton's Second Law

Least Favorite: Murphys Law

Basel A

04-02-2011 23:48

Re: your favorite equations for build seasion

I've been modelling some of our robot's movements using an intersection of two circles..

(x-a)^2 + (y-b)^2 = r^2
It is ftw

Matt Krass

04-02-2011 23:51

Re: your favorite equations for build seasion

Can't believe no has said this yet:

V = IR

(I^2)R = VI = P

Or, to have some fun:

Fs >= 2B (any takers? it's not an exact formula, more of a theorem, and kind of hard to represent without proper math symbols)

Matt

iblis432

04-02-2011 23:54

Re: your favorite equations for build seasion

mine is used for when i get tired of the code stopping for stupid reasons

while true==true

PAR_WIG1350

05-02-2011 00:02

Re: your favorite equations for build seasion

Quote:

Originally Posted by ttldomination (Post 1015906)

Idk, but the Law of Cosines has become more sexy than usual...

Trigonometry has always been rather attractive from my perspective
<3<3<3<3<3

mwtidd

05-02-2011 00:56

Re: your favorite equations for build seasion

A nice little as3 script for parsing the FIRST website :)

PHP Code:


		
			
var temp:ArrayCollection = ArrayCollection(event.result);

                var tempString:String = "";

                var sentUrl:String = temp.getItemAt(0) as String;

                var eid:String = sentUrl.substr(sentUrl.search("eid=")+4,sentUrl.length);

                eid = eid.substr(0,eid.search("&"));

                for(var n:int = 1; n < temp.length; n++){

                    tempString+=temp.getItemAt(n);

                }

                tempString = tempString.substr(tempString.search('<tr bgcolor="#FFFFFF">'),tempString.length);

                tempString = tempString.substr(0, tempString.search('</table>'));

                var i:int = tempString.search('\t');

                while( i != -1){

                    tempString = tempString.replace('\t',' ');

                    i = tempString.search('\t');

                }

                i = tempString.search('<br />');

                while( i != -1){

                    tempString = tempString.replace('<br />',' ');

                    i = tempString.search('<br />');

                }

                i = tempString.search('nowrap');

                while( i != -1){

                    tempString = tempString.replace('nowrap',' ');

                    i = tempString.search('nowrap');

                }

                

                tempString = "<table>" +tempString+"</table>";

                var xml:XML = XML(tempString);

                for(i = 0; i < xml.children().length(); i++){

                    var location:String = xml.child(i).child(0).child(0).toString();

                    var name:String = xml.child(i).child(1).child(0).toString();

                    var url:String = "https://my.usfirst.org/myarea/index.lasso?page=event_details&eid="+eid+"&-session=myarea:C77D640504fbb2FB82SVt2270655"

                    var number:String = xml.child(i).child(2).child(0).child(0).toString();

                    var service:EventService = new EventService();

                    service.addMember(parseInt(eid),parseInt(number));

                }

FRC4ME

05-02-2011 01:09

Re: your favorite equations for build seasion

Well, in 2009 (Lunacy) our favorite equation was F=uN, or "fun," as we called it, to the point that the judges mentioned our use of "the equation 'fun'" during our DTT award speech at Championship.

Quote:

Originally Posted by jamie_1930 (Post 1015848)

All for the metric system say "I"

Jay.

EricH

05-02-2011 02:08

Re: your favorite equations for build seasion

For those saying that W=Fd is wrong, "d" is often used for distance. You could also use "l" for "length", but "d" is more common.

I kind of like the following:

Stress = F/A.
Stress = Homework/Time.
Therefore, Homework is a force.

Oh, and then there's this one:

Reading + Manual + Updates + Q&A = someone who knows the rules and doesn't have to ask [current most annoyingly common rules question].

demosthenes2k8

05-02-2011 09:43

Re: your favorite equations for build seasion

Ehhhh. I should have mentioned that it only works for whole numbers. So measure in seconds.

RoboMaster

05-02-2011 17:17

Re: your favorite equations for build seasion

W=[delta]KE
Or, WAKE!!!! (as in: wake up you sleepy robotics student!)

This one is pretty nice too:
motor in = (joystick out)^3
That keeps the freshmen from cranking on the joysticks to much.

Cyberphil

05-02-2011 19:52

Re: your favorite equations for build seasion

Quote:

Originally Posted by jamie_1930 (Post 1015848)

-All unit conversions (although annoying. All for the metric system say "I")

I

My favorite, and most used would have to be F=ma, hands down.

FRC4ME

05-02-2011 20:06

Re: your favorite equations for build seasion

Quote:

Originally Posted by ttldomination (Post 1015906)

Idk, but the Law of Cosines has become more sexy than usual...

Reminds me of 2007. I was taking geometry in high school at the time, and it was awesome to be able to apply that to locating the poles on the rack. We ended up using about 80% of the IFI controller's processing power that year with all of the trig during autonomous.

And then in 2009 I was taking high school physics...man, my high school FRC experience was perfectly timed. :)

Andrew Schreiber

07-02-2011 10:01

Re: your favorite equations for build seasion

Quote:

Originally Posted by lineskier (Post 1015962)

A nice little as3 script for parsing the FIRST website :)

PHP Code:


		
			
var temp:ArrayCollection = ArrayCollection(event.result);

                var tempString:String = "";

                var sentUrl:String = temp.getItemAt(0) as String;

                var eid:String = sentUrl.substr(sentUrl.search("eid=")+4,sentUrl.length);

                eid = eid.substr(0,eid.search("&"));

                for(var n:int = 1; n < temp.length; n++){

                    tempString+=temp.getItemAt(n);

                }

                tempString = tempString.substr(tempString.search('<tr bgcolor="#FFFFFF">'),tempString.length);

                tempString = tempString.substr(0, tempString.search('</table>'));

                var i:int = tempString.search('\t');

                while( i != -1){

                    tempString = tempString.replace('\t',' ');

                    i = tempString.search('\t');

                }

                i = tempString.search('<br />');

                while( i != -1){

                    tempString = tempString.replace('<br />',' ');

                    i = tempString.search('<br />');

                }

                i = tempString.search('nowrap');

                while( i != -1){

                    tempString = tempString.replace('nowrap',' ');

                    i = tempString.search('nowrap');

                }

                

                tempString = "<table>" +tempString+"</table>";

                var xml:XML = XML(tempString);

                for(i = 0; i < xml.children().length(); i++){

                    var location:String = xml.child(i).child(0).child(0).toString();

                    var name:String = xml.child(i).child(1).child(0).toString();

                    var url:String = "https://my.usfirst.org/myarea/index.lasso?page=event_details&eid="+eid+"&-session=myarea:C77D640504fbb2FB82SVt2270655"

                    var number:String = xml.child(i).child(2).child(0).child(0).toString();

                    var service:EventService = new EventService();

                    service.addMember(parseInt(eid),parseInt(number));

                }

I think we need to introduce you to our friend the regular expression...

Favorite equation for this build season? Torque = r x F. Law of Cosines comes in a close second. Though, I am also a pretty big fan of: Position = ∫∫Acceleration and the cylindrical coordinate system.

Zuelu562

07-02-2011 12:33

Re: your favorite equations for build seasion

C(amps) = V/ohms. Seems to be very useful this year. A lot of people seem to be burning out stuff by putting them to incorrect electrical loads (D-Links, for instance X.X).

Also, R + T + M = (Occasional Lack of) Knowledge ::rtm::

fox46

07-02-2011 13:12

Re: your favorite equations for build seasion

I can't believe I haven't see one of the most important minibot equations!?

Ep = mgh

Astarties

07-02-2011 13:57

Re: your favorite equations for build seasion

Quote:

Originally Posted by artdutra04 (Post 1015894)

You don't have a ∴ key? It's right next to 'Any' key. :p

I like using that symbol on homework and imagining that the predator is targeting my homework.

pV=nRT
τ=rFsinϴ

Alan Anderson

07-02-2011 14:58

Re: your favorite equations for build seasion

My favorite equation of all time, for all time, at all times, is the one which relates five fundamental mathematical constants using addition, multiplication, and exponentiation.

0: the additive identity element
1: the multiplicative identity element
e: the natural base
pi: the ratio of a circle's circumference to its diameter
i: the square root of negative one

e^(i*pi) + 1 = 0

I wish I could do superscripts properly using vBulletin.

My second favorite equation is actually just an approximation: 1 foot ≈ 1 nanosecond

artdutra04

07-02-2011 18:59

Re: your favorite equations for build seasion

Quote:

Originally Posted by Alan Anderson (Post 1017675)

I wish I could do superscripts properly using vBulletin.

You can so ^superscripts and _subscripts in vBcode.

548swimmer

07-02-2011 20:39

Re: your favorite equations for build seasion

All of the torque and RPM equations for motors and their assorted conversions!

Foster

07-02-2011 21:39

Re: your favorite equations for build seasion

P= ((3.4 * N) div 8 ) + 1

Give N roboteers the number of pizzas P to order

cire	07-02-2011 21:43

Re: your favorite equations for build seasion

Most used: circumference = 2 * Pi * r

Favorite: f = m * a

Molten

08-02-2011 00:07

Re: your favorite equations for build seasion

Quote:

Originally Posted by PAR_WIG1350 (Post 1015937)

Trigonometry has always been rather attractive from my perspective
<3<3<3<3<3

I think it must be all the curves it comes with. ;)

FarmerWilly

10-02-2011 17:57

Re: your favorite equations for build seasion

1+1=11 <-My sister said this one the other day.

2
But seriously everyone, F=MA and E=MC :ahh:

billbo911

10-02-2011 18:14

Re: your favorite equations for build seasion

"Circumference = pi*D".......pause for effect........"think about it".

Also:

"pie = crust + filling"....... more pause....... "Oh, you mean "pi". OK, that's 22/7 rounded to the second place.......What?........Did you want 3.1415927"?

dubiousSwain

05-05-2014 08:45

Re: your favorite equations for build seasion

Quote:

Originally Posted by iblis432 (Post 1015932)

while true==true

I use
:While 1=1

all the time in TI-BASIC

dubiousSwain

05-05-2014 08:50

Re: your favorite equations for build seasion

Quote:

Originally Posted by Alan Anderson (Post 1017675)

My second favorite equation is actually just an approximation: 1 foot ≈ 1 nanosecond

not sure if reference?
http://mspaintadventures.wikia.com/wiki/Yellow_Yard

Caleb Sykes

05-05-2014 09:11

Re: your favorite equations for build seasion

a = dv/dt
v = dx/dt

P = τω = E/t = Fv = IV

MechEng83

05-05-2014 09:57

Re: your favorite equations for build seasion

For me, it's these equations:

T=F*d*sin(theta)
Law of cosines [c^2 = a^2 + b^2 - 2*a*b*cos(theta)]
Law of sines [sin(a)/A = sin(b)/B = sin(c)/C]
F=k*x
k=A*E/L

cmrnpizzo14

05-05-2014 13:37

Re: your favorite equations for build seasion

_.^._.

Hahaha! I did it! Take that VbCode!

Nemo	05-05-2014 14:09

Re: your favorite equations for build seasion

Quote:

Originally Posted by Alan Anderson (Post 1017675)

I'm with the Tauists on this one:

e^(i*tau) = 1

BBray_T1296

05-05-2014 14:26

Re: your favorite equations for build seasion

Theoretical velocity

Where: M=motor speed (rpm), Or=overall reduction, d=wheel diameter (inches), V= velocity (feet per second)

(M*Or*π*d)/(60*12)=V

Useful for calculating robot speed as well as projectile speed. For shooting frisbees last year, knowing how many feet/second the shooter wheel spun, assuming static friction on the opposing wall, you could both calculate the linear and rotational velocity of the disk as it exited the shooter.

faust1706

05-05-2014 15:43

Re: your favorite equations for build seasion

sm'= A[R|t]M' aka camera pose estimation. I used this bad boy in 2012. It is a beautiful equation.

Yipyapper

05-05-2014 16:14

Re: your favorite equations for build seasion

Arizona Green Tea + Programmers = Code

MechEng83

05-05-2014 16:19

Re: your favorite equations for build seasion

Quote:

Originally Posted by Yipyapper (Post 1382915)

Arizona Green Tea + Programmers = Code

Interesting. I thought the function was

Code:

code = programmer(pizza,Mountain Dew)

*disclaimer* I am not a programmer. Please excuse syntax errors.

Yipyapper

05-05-2014 16:21

Re: your favorite equations for build seasion

Quote:

Originally Posted by MechEng83 (Post 1382920)

Interesting. I thought the function was

Code:

code = programmer(pizza,Mountain Dew)

*disclaimer* I am not a programmer. Please excuse syntax errors.

My body became immune to pizza's code influence at this point, I needed to find a new way to make code. So much pizza...

All times are GMT -5. The time now is 08:19.