[Closed] Program to check rear suspension of racing car

[JamRacing]

Hello,i am new to openOffice calc forum.From South Africa. Need help to create a basic suspension program in 3D to check movement of rear suspension of my Formual Vee.Have an old Qbasic program that can do front but will not do rear.I cannot add code as i have non thats why i am here.Thanks in advance.

[keme]

This is a "peer support" site for a family of office productivity software. You seem to be asking for help with 3D modeling in an engineering context, which is not the realm of the software we are targeting here.

You have code for QBasic. The integrated programming language in OpenOffice and related suites is StarBasic. It is not trivial to translate code from QBasic to StarBasic.

While Calc (which is a part of the office suites) can be used to create a mathemathical calculation model of 3D geometry, forces and movement, you probably need other software (some 3D CAD package, which is not part of the suites) to sufficiently assess spatial geometry and behavior of your vehicle (contact points, stress reliefs, wheel tracking under load conditions, etc.).

If you still feel that this is the right place, tell us more about what you need. What have you tried and how/why does it fail?

If calculation is all you need, you must provide the math. We can most likely show you how to put it together in a useful manner.

[JamRacing]

Thanks for reply. There are programs written in Excel but cannot do this type of suspension. I don't want sum fancy program. It is basically a triangle moving through an arch. Attached at two points where it pivots at. So as it moves in an arch the wheel may also move in an arch in the x direction. That will be because of pivot at rear of chassic. I don't need load etc just movement. So please can someone help.

[keme]

You say that the rear is different. I can imagine that there is added challenge in the rear because of the drive train, but you don't need to worry about the directional movement (steering). Geometry may be different, but the principles should be similar.

Other than those general observations, we can offer little help as long as you offer nothing of what you have got and what you have done. We (most of us, at least) are not automechanics. We might search for data and build something from guesswork which we might calculate on, but most likely that would not be a useful exercise neither for us nor for you.

[JamRacing]

I have no idea about maths so need help. This is not for gain only for my own use.

[RoryOF]

But we don't know the detail of what you want to do. What formulae are used?

[JamRacing]

I have no idea what formula to use need advice on that too...sorry

[John_Ha]

We are not suspension experts so we can only offer you advice on how to correct errors you are making in using a spreadsheet - we can tell you nothing about what formulae you should be using.

Buy a book on suspension design - Suspension Geometry and computation 1st Edition is an example - there are lots available.

When you have chosen which design method to use, create a spreadsheet to do the calculations in the book and, if you run into troubles, come back, posting the spreadsheet.

It would help if you posted the Excel file for the front suspension so we can see what you are doing - it should be a .xls or a .xlsx. The .csv file you posted contains no more information that these figures written on a sheet of paper. It has no formulae so cannot calculate anything.

Code: Select all

Layer Name   Object Name   Object Category     Object Type

Default                    curve               line
Default                    curve               line
Default                    curve               line
Default                    point               -530,380,0
Default                    point               530,380,0
Default                    point               -77.5,0,0
Default                    point               77.5,0,0
Default                    point               0,0,0 

[keme]

I have no idea what formula to use need advice on that too...sorry

The attached csv file contains the coordinates for 5 points in space, all in the X/Y plane (Z=0), which with some goodwill can be construed as describing two triangles.

How those triangles relate to each other, the wheels, the chassis, and the road, is a mystery to everyone except possibly yourself. Sorry!

If you want help, you need to tell us what you need help with.

Describe the car part. Measures. Pivot points.
What exactly do you need to learn about the suspension, that you don't already know?

[John_Ha]

Do you know how to use a search engine?

If so, what happened when you searched for, say, suspension design spreadsheet? I found quite a lot of potentially interesting pages.

[Villeroy]

The best device to check the rear suspension of your racing car is your ass.

[JamRacing]

Non of those programs work on the rear suspension i have.Been through all of them. EVEN Susprog does not work.It has to be written to suite my car. It is more a project than a necessity. Can do it on the car with wheel alighment gauge and string.I have found that Excel or OpenOffice cannot do 3D. So move on but thanks to all that answered.And to the guy that said i must use my bum.......u thing thats funny.

[Hagar Delest]

The best device to check the rear suspension of your racing car is your ass.

That's the Quality check only.
Better have a code to optimize the design first.