So I can use m/s2 when increasing speed to top speed. Do you think those acc values on sheet are correct?
Next question is when using manual transmission, if user shiftup's too early is the car still accerelates as calculated on the acc table values?
-- Well seems like I can use table...
Ok I have edited accerelation table in spreadsheet.
Now I got m/s2. Should I convert it to km/h2 to use it? This is a lil bit confusing to me actually. Cause I guess I need to multiply each value with (36*360) so I get km/h2? :eek:
Ok let's see
T = F.d so F = T/d
and F = ma so T/d = ma
therefore a = T/(d . m)
I guess 1100kg is weight of a car so I should divide it by 9.8 gravity, right?
It is not easy to find SI unit examples and explanations on internet maybe I should stick with English units all the time.
I have added accerelation at the bottom of sheet (http://spreadsheets.google.com/ccc?key=0ArPyqArltO-KdGxqX3l6WGJfTjUyTEwyUTZidkwtRHc&hl=en)
Sheet is editable. I...
Hey Chris,
I just posted a comment before you did. Can you make comments on that? What would you suggest? Should I start over, this time calculating forces on car and let the calculation determine max speed at certain gear and RPM?
@Jeff Reid I'm kinda rookie on these things. I am a software engineer, and I do not know much about cars. I want to simulate a vehicle using engine HP, gear ratios, and torque. Actually I kinda don't get what you mean, sorry. :confused:
@nucleus That crankshaft website is wow, but there's...
My problem is I need to adjust accerelation value. If you start your car at 4th gear it won't accerelate as fast as 1st gear right? So how can I adjust my acc. values?
Ok yesterday thanks to Chris I finally got max velocity at certain gear and RPM...
Now I got accerelation and max velocity value.. I don't want to stop here, and I need more information and I think I can only get it from here somebody who knows about this topic.
I realized I need to adjust...
I have a ford escort (2000) which is 90hp and I found gear ratios of ford: 3.35 1.99 1.33 1.00 0.68 (http://www.vibratesoftware.com/html_help/html/Ford/Ford_Transmissions_Main.htm#5%20Man )
I have changed these values on spreadsheet.
I might messed up with rpm-torque relationship cause I do...
Ok I guess you have edited spreadsheet. I see you change gear ratio as 1/gear ratio. And Divide RPM to 60 for converting m/min to m/sec.. So good till this point. But as you can see at table below km/h table, this car reach 105km/h at 1st gear which supposed to be a normal car, and at 5th gear I...
Ok I am not sure if I am doing it right.
I have shared a spreadsheet: http://spreadsheets.google.com/ccc?key=0ArPyqArltO-KdGxqX3l6WGJfTjUyTEwyUTZidkwtRHc&hl=en
This spread sheet is editable.
Spreadsheet includes RPM, torque, calculated gear ratios, HP, at the end velocity from formula but I...
Thank you for your replies guys...
That spreadsheet I posted before does not belong to me, I found it on here. I've used torque, car mass, gear ratios and RPM to calculate vehicle's accerelation.
I actually want is max velocity that's all. Seems like this method is useful for me:
(engine...
Hey guys,
I'm kinda simulate vehicle dynamics. I got gear ratios, torque and RPM values. I find how to calculate instant accerelation from
http://spreadsheets.google.com/ccc?key=pBCH2ClzmrplHUNFgrkT7HA
Ok now I got acc. :wink: I can calculate velocity from acc but my problem is how to...
Conclusion:
It is not correct! I shouldn't use MOI. I can calculate it without doing those steps. Without finding angular acc/velocity.
It is also discussed in here: https://www.physicsforums.com/showthread.php?p=2373394&posted=1#post2373394
And for more info here...