Calculation of deviation from target path - ADAMS CAR

Question

Calculation of deviation from target path - ADAMS CAR

John.B (Automotive)

(OP)

11 May 24 07:23

Hi,
Is there any measurable way to calculate the deviation of the vehicle from the targeted path in simulations like Constant Radius Cornering.
Please find the screenshot below for reference.

https://files.engineering.com/getfile.aspx?folder=c8590e06-72c2-4944-99fe-4

GregLocock (Automotive) · Answer 1 · 2024-05-11 12:27:38

I'd have thought there were functions that captured the SmartDriver behavior, although frankly you actually know both the desired path and the actual path.

Cheers

Greg Locock

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alok_singh (Automotive) · Answer 2 · 2024-05-16 15:46:47

I think by measuring the slip angle at each tire(it will be a function of vehicle speed). That will give you the dynamic turning center, From there you can calculate actual TCD. [If I remember correctly the formula is given in this book:-https://link.springer.com/book/10.1007/978-3-319-0...]. Or You can plot understeer gradient that will give you an idea what is the actual path.

Thanks
Alok

John.B (Automotive) · Answer 3 · 2024-05-17 03:16:01

I was thinking of creating two markers one in the ground and other on C.G and create a request to get the distance between two.

Thanks
John

alok_singh (Automotive) · Answer 4 · 2024-05-17 15:28:29

I think in CRC test distance between those two marker won't change(educated guess). Its better to measure the yaw angle. Can I ask why you are measuring paths in CRC test?

Thanks
Alok

GregLocock (Automotive) · Answer 5 · 2024-05-17 21:56:35

You certainly can measure the path of the CG, although that in itself is interesting due to roll, and you can of course plot the ideal path.

I misspoke, i was thinking about SmartDriver, you'll be using the Driving Machine as described in the Getting Started guide. I'm pretty sure there are requests to interrogate the DM.

Cheers

Greg Locock

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John.B (Automotive) · Answer 6 · 2024-05-20 03:21:26

Hi Alok, I'm measuring paths to calculate deviation. i.e I need to understand when the vehicle is starting to slide away from the target path and at what speed.

John.B (Automotive) · Answer 7 · 2024-05-20 03:22:56

Hi Greg,
Yes I'm exploring how to create requests to get extract required information.

GregLocock (Automotive) · Answer 8 · 2024-05-20 04:02:59

I'm not having much luck googling for DM interrogation requests, it might be worth trying the Hexagon support forums.

Cheers

Greg Locock

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Calculation of deviation from target path - ADAMS CAR