Subject: Re: indycar parameters
From: "Alan K. Gideon"
Date: Thu, 19 Dec 1996 07:28:31 -0500
B.J. Jasinski wrote:
>
> hi all,
>
> i'm doing a project for a class which involves a lap-time simulation of
> an indycar. i have been researching the parameters (i.e. geometry,
> mass, moment of inertia) of the whole car and various parts of the car
> that i need, and i would like to get some verification if anyone knows
> more than i do.
>
> here's the parameters i am having trouble determining:
>
> Chassis:
> --------
> mass=715kg (i have also found other values up to 905 kg, i'll
> probably use an average of the 2)
> Izz=1525 kgm^2 (by approximating the chassis as a rod, and
> wheels as point masses, i calculated 775 kgm^2.
> which is closer? i got the 1525 kgm^2 from SAE
> paper 910012, but i'm not sure i believe it)
> Af=1.0 m^2 (frontal area - i estimated this from car
> drag mesasurements)
>
> Engine:
> -------
> Power=850hp (634kW)
> Max RPM = 13800 (1445 rad/sec)
>
> These values give an engine torque at max rpm of 438Nm, is this
> realistic?
>
> Final Drive Ratio= 4.09 (got this from SAE paper 910011 for a 5th gear,
> is this also realistic?? estimating some
> values i calculated 3.25)
>
> Wheels:
> -------
> radius = 0.33m
> Iyy = 0.89kgm^2 to 1.29kgm^2 (i will most likely average these values
> for the final simulation.)
>
> just in case it matters, the project is due on friday, and i would
> appreciate a quick response.
>
> thanks in advance,
> b.j.
>
> --
> B.J. Jasinski
>
In the past, we've given folks a bad time for expecting the newsgroup to
do their homework for them. In this case, it looks like B.J. mostly
needs a reality check on the numbers. I can't help with that, but
surely we've got someone that can. Come on folks, it's close to
Christmas.....8^)
--
Alan K. Gideon, P.E. | Naval Architect & Marine Engineer
| akgideon@mindspring.com
"If you're not still learning, you've already retired
- your boss just hasn't noticed yet."
Peter Coffee, November 1996
Subject: Re: How about an .Ansys newsgroup?
From: Leslie Fowler
Date: 19 Dec 1996 14:42:10 GMT
In sci.engr.mech Enrique Juaristi wrote:
[ANSYS newsgroup proposed]
: If you agree with this, please reply to this message on the newsgroups. I
: am not familiar with the workings of the Newsgroups, but if we are enough
: interested people we might create something worth the while!
6 of us here use ANSYS everyday and would be very interested in an
ANSYS newsgroup!!
Leslie (and Jim, Wei, Nader, Bill, Doug)
LORD Corporation
--
___________________________________________
Leslie P. Fowler
lfowler@acm.vt.edu
leslie_fowler@lord.com
http://acm.vt.edu/~lfowler
___________________________________________
Subject: Software Announcement
From: Riju_Saini@msn.com (Riju Saini)
Date: 19 Dec 96 18:49:23 -0800
Software Announcement From ChemicaLogic Corporation
==================================================
Location: http://www.chemicalogic.com
ChemicaLogic Corporation is pleased to announce the immediate
availability of the following software:
1. SteamTab: Thermodynamic and Transport Properties of Steam
Version 2.0, Release: Sept 1, 1996, Demo available for download
SteamTab is an add-in for popular spreadsheets that you can use to
obtain the thermodynamic and transport properties of steam - right
in you spreadsheet. SteamTab is based on the NBS/NRC Steam formulation.
2. SteamTab Duo
Version 1.0, Release: Dec 1, 1996, Demo available for download
SteamTab Duo set a new standard in capability and an ease-of-use in
steam property generation. SteamTab Duo contains all of the features
of SteamTab. In addition, with SteamTab Duo, users can choose from
two formulations to base their steam property calculations: NBS/NRC
Steam Formulation, and IFC 1967 Formulation for Industrial Use (ASME
6th Edition).
3. Molecular Weight Calculator
Version 1.0, FREE download available
Molecular weight calculator is a FREE add-in for spreadsheets to
obtain the molecular weight of chemicals. Download it for free,
our compliments.
To find out more about these products, visit http://www.chemicalogic.com
Thank you,
clc.support@chemicalogic.com
Subject: Re: Ansys vs. MSC FEA Software
From: wolvert@impulse.net (Tom Wolverton)
Date: 20 Dec 1996 05:06:08 GMT
>
> >If you are are a user of either Ansys or MSC, I would greatly appreciate
> >some feedback (positive or negative).
You have to realize that the age-old battle - ANSYS vrs NASTRAN is like
trying to get the Orange Irish to make peace with the Green Irish. Amoung
FEA users the cultural differences and loyalties run very deep (beyond
reason many times).
Maybe it has to do with which code you learn first.
but here's my 2 cents worth --
I've used both (ver 5.2 ANSYS and Ver 68 MSC/NASTRAN as well as
CSA/NASTRAN) and I have to say that both ANSYS and NASTRAN are good solid
products. It kind of depends on the types of problems you are solving.
ANSYS's parametic input stuff is nice and NASTRAN's DMAP is nice too.
Since I have been doing mostly static stress and dynamics analyses (modes,
sine, random) I have to say that NASTRAN (both MSC and CSA versions) beat
ANSYS hands down for ease of using in this area. The DAMP feature is very
powerful. Try doing a cross-orthogonality check of FEA [phi] against
modal test data. ANSYS - it will be a bit difficult - with a DMAP alter in
NASTRAN (MSC, CSA or UAI) it is a snap.
I have felt that MSC and CSA user support was better than ANSYS support.
one time, I called the Swanson Penn. office and the guy on the hotline was
*very* short with me because I was calling him instead of their California
office (it was 6 AM, the CA office was not open). MSC never has done that
to me.
- Tom Wolverton, P.E.
Subject: Re: indycar parameters
From: Doug Milliken
Date: Fri, 20 Dec 1996 08:23:07 GMT
Not sure if my earlier post made it here... I got cut off as I was
sending.
Anyway, there is a table of Indycar data on pp 825 of our book, "Race Car
Vehicle Dynamics". It has some of what you want.
Not sure why you need yaw inertia for a lap time simulation -- good,
smooth drivers _minimize_ yaw acceleration, to save the lateral tire
forces for actual lateral acceleration... Anyway, the pitch inertia
in the table will be nearly the same as the yaw inertia.
Car weights vary by several hundred pounds, depending on fuel loading.
Available engine power changes every year with rules changes, I'm not up on
this. Air drag and downforce change with every track that they run on, as
do all the gear ratios. A good simple use for a lap time simulation (given
reasonable engine and aero data) is to _choose_ the gear ratios...
Sincerely,
-- Doug
Douglas Milliken
Milliken Research Associates Inc.
--------------------------
On Wed, 18 Dec 1996, B.J. Jasinski wrote:
> hi all,
>
> i'm doing a project for a class which involves a lap-time simulation of
> an indycar. i have been researching the parameters (i.e. geometry,
> mass, moment of inertia) of the whole car and various parts of the car
> that i need, and i would like to get some verification if anyone knows
> more than i do.
>
> here's the parameters i am having trouble determining:
>
> Chassis:
> --------
> mass=715kg (i have also found other values up to 905 kg, i'll
> probably use an average of the 2)
> Izz=1525 kgm^2 (by approximating the chassis as a rod, and
> wheels as point masses, i calculated 775 kgm^2.
> which is closer? i got the 1525 kgm^2 from SAE
> paper 910012, but i'm not sure i believe it)
> Af=1.0 m^2 (frontal area - i estimated this from car
> drag mesasurements)
>
> Engine:
> -------
> Power=850hp (634kW)
> Max RPM = 13800 (1445 rad/sec)
>
> These values give an engine torque at max rpm of 438Nm, is this
> realistic?
>
> Final Drive Ratio= 4.09 (got this from SAE paper 910011 for a 5th gear,
> is this also realistic?? estimating some
> values i calculated 3.25)
>
> Wheels:
> -------
> radius = 0.33m
> Iyy = 0.89kgm^2 to 1.29kgm^2 (i will most likely average these values
> for the final simulation.)
>
> just in case it matters, the project is due on friday, and i would
> appreciate a quick response.
>
> thanks in advance,
> b.j.
>
> --
> B.J. Jasinski
>
> Graduate Research Assistant
> Department of Aeronautical & Astronautical Engineering
> University of Illinois at Urbana Champaign
> (217) 244-0492 fax: (217) 244-0720
> e-mail: wjasinsk@uiuc.edu
> http://www.students.uiuc.edu/~wjasinsk/
>
> "Without love in a dream, it will never come true..."
>
>
Subject: Job Offer for System Simulation Expert
From: "Dr.-Ing. Norbert Mittwollen"
Date: Fri, 20 Dec 1996 11:54:57 +0100
Job Offer for System Simulation Expert:
A research position for a scientist or engineer will be available within
our participation in the Brite EuRam III project TOOLSYS (Open Toolset
for Mixed Simulation of Multidomain Systems). The candidate can be from
any European Union (EU) country, should be fluent in English (fluency in
German is not required but will help), and have experience in numerical
simulation of systems (electr./mechanic/hydraulic/autom.control). The
project requires a close collaboration with researchers from other
European countries. The common goal is the implementation of a new
generation of software tools for modelling, design and
simulation of automotive systems.
Those who are interested can contact me via tel, fax or email for
further information or send a complete application including curriculum
vitae, all relevant certificates, and an outline of professional
background to:
Dr.-Ing. Norbert Mittwollen
Corporate Research 2, Dept. for
Information and System Technology
Robert Bosch GmbH, Dept. FV/FLI
P.O. Box 10 60 50
D-70049 Stuttgart, GERMANY
Visitors: Robert-Bosch-Platz 1
D-70839 Gerlingen-Schillerhoehe
Tel: +49 711 811 6946
Fax: +49 711 811 7602
E-mail: mittwollen@fli.sh.bosch.de
