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Type: Posts; User: BillCobb

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    MM or ABM

    Or is this an Anthony Best result ???1371
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    Morse Code

    Yep, I thought I recognized Morse Measurements results...1369
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    K & C Testing Issues

    The Fy input at "Zero Offset" I presume to mean that the force is applied at the wheel plate directly below the spindle center point at "the Ground"

    The measurements pick out the separate steer...
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    When I hired in to GMPG, they had a machine in...

    When I hired in to GMPG, they had a machine in addition to the Chevy VHF in Warren) loaded by pumping water in and out of tanks to alter loads. I also remember a Lotus rig that Jack Turner (r.i.p.)...
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    Part-I of the rest of the story

    Have you seen this presentation I had Pat post on the Facebook FSAE site ?

    https://drive.google.com/drive/folders/1IyYhWON1BtjY9Igdz0zlziZZN_7az3Yo

    I have a rear compliance effects deal waiting...
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    Fit Quality:

    I'm not seeing a huge range of fit quality if the transfer function in Bode Form are used. Yes the resulting damping and frequency parameters that you would obtain will be different.

    2 Examples: ...
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    Nice job !

    For a first round experiment, this looks very good ! First suggestion would be to improve/reduce speed variation. With constant speed, you eliminate a very important state variable.

    Next...
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    The 2 processes are essentially interchangeable. ...

    The 2 processes are essentially interchangeable. Each one promotes a set of constitutive describing functions based on gain, damping and natural frequency. What makes FSAE cars so special is their...
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    Steer under or steer over ?

    A good question about the UG you probably ought to determine for the sake of beating up those design judges who are way out of their element.

    Just the facts, Ma'am:

    1) Constant speed...
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    Oldie But Goodie

    I would like to know if anyone at Leeds could resurrect the simulation mentioned in this SAE paper. Since there has been little if any sim/test material much less correlation work presented...
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    Enf is Enough- II

    Prologue:
    I use the term "ENF" to describe steer ("E") from aligning moments and tierod forces (N) at
    the 'F'ront axle not resulting from any steerig wheel movement. Other compliances (inverse of...
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    Thank You, Doug !

    Thanks, Doug !. It's been so boring here, I went out and cut some hay and baled it.
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    Compliance with the Steering Rules.

    I am disappointed but not surprised at the lack of response, comments or interest in the steering compliance results posted here by Vishnu. (Commendable job, BTW, and very brave to reveal your data...
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    For Example

    A indoor lab test whose importance is so very often overlooked, is a test for overall steering ratio. Simple stuff. Measure steering wheel angle, measure one or both road wheel angles, calculate a...
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    In Godd we trust, all others will need to brings some data.

    Thanks to all for your interest. Let's see some results. Don't have to wait for better weather, do some indoor tests of steering compliance and overall steer ratio. The compliance results will...
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    C-Speed Test using your Android Phone

    The heck with a VBOX, Use this app (or the free version) and use your phone to compute your FSAE cars understeer !

    http://www.rotoview.com/sensor_kinetics_pro_android.htm
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    Run before you walk away

    OK, so if some forms of testing are too hard, too complicated or too expensive for a student team, try a very simple test from the infant stages of vehicle dynamics with road cars: The "C-Speed"...
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    Step Fit and Frequency Decomposition.

    Whether simulation or on road testing, Matlab tools require only the simplest scripting to reduce your raw data to Engineering results. You should not be 'programming in Matlab the way you would in...
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    ENF Demo

    Here's an example of a way to parameterize your data for K&C types of tests: Run it through a function.

    Here's the function:

    function [enf]= enf_fcn(enfb,enfc,nf)...
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    Enf is Enf.

    Enf is the symbolic name for front aligning torque compliance steer on some planets: 'E' = steer, 'N' is aligning moment, 'F' as in front.

    So, put your car on grease plates, lock the steering...
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    Re-Revival

    Not really surprized by the null conversation about these synthesis tools. That's because, really, there are more mechanics than engineers involved in this pendeavor, and the engineers appear to be...
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    Looks Good !

    Use the "unwrap" function to remove the jump in phase plots to make them continuous. To include the effects of suspension compliance, incorporate their action as a calculated loss in tire cornering...
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    Yawn

    Sweet ! Roll just looks heavily damped. Wouldn't your car have some peak roll just from tires, alone, though?

    On the other question, roll probably doesn't have a lot of speed dependency while...
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    Excellant Work.

    This analysis is A+++.
    There is no Laugh Factor needed for anything presented here. Your Sim results look like what I found from my own based on a few known and some guessed paramters. Your...
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    Step By Step Testing

    Another jewel in the analysis and testing crown of simulations AND actual vehicles is the Constant Speed Step Test. The objective of this analysis is to characterize the response to steering up to...
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