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Type: Posts; User: rory.gover

1. ## Thread: Plotting Cn-Cy and Cn-Ay Graphs.

by rory.gover
Replies
93
Views
31,235

### I tried out the pulse steer method to tease out...

I tried out the pulse steer method to tease out the freq response from a vehicle (again, Lagrangian mechanical vehicle model). results below (gifs @ 120 km/h).

Pulse steer - 10 deg SW over 2.5 sec...
2. ## Thread: Plotting Cn-Cy and Cn-Ay Graphs.

by rory.gover
Replies
93
Views
31,235

### At 5x speed, a chirp steer test conducted at 50...

At 5x speed, a chirp steer test conducted at 50 km/h over 20 sec. Red-line connects vehicles CoM to CoM centre of curvature (obviously this tends to +- infinity as the normal acceleration tends to...
3. ## Thread: Plotting Cn-Cy and Cn-Ay Graphs.

by rory.gover
Replies
93
Views
31,235

### Harry, I believe I linked to the article you are...

Harry,
I believe I linked to the article you are referring to: http://journals.sfu.ca/vte-j/index.php/vte-j/article/view/6.

Erik,
I think we're on much the same page here, though we come at the...
4. ## Thread: Plotting Cn-Cy and Cn-Ay Graphs.

by rory.gover
Replies
93
Views
31,235

### Yeah, r is taken into account. But I guess the...

Yeah, r is taken into account. But I guess the point of my input was to highlight that r (chassis rotational velocity) does not equal ay/V, or even an/V. Omega (the rotational velocity of the...
5. ## Thread: Plotting Cn-Cy and Cn-Ay Graphs.

by rory.gover
Replies
93
Views
31,235

### I have always found it interesting that most...

I have always found it interesting that most dual-axis acceleration diagrams (e.g. Cn-Ay etl al) ignore body slip angle rates (see below). While not a huge concern when the diagrams are being used to...
6. ## Thread: Best way to import GPS track for point mass simulation?

by rory.gover
Replies
19
Views
7,500

### Nb. the output of a GPS signal is lat & long plus...

Nb. the output of a GPS signal is lat & long plus noise, which can be converted to relative x & y coords plus noise without adding in additional noise. In order to calculate curvature, you need the...
7. ## Thread: Tire Analysis Best Approach?

by rory.gover
Replies
27
Views
14,391

### I've found that using the cousin of a neural...

I've found that using the cousin of a neural network, the genetic algorithm (followed by some gradient based cost minimisation), is a great method for determining the coefficient values for MF 5...
8. ## Thread: Two simple rules to improve results.

by rory.gover
Replies
109
Views
40,522

### Z's JJ does FSAE-A 2016 track at a 86.7 sec pace...

Z's JJ does FSAE-A 2016 track at a 86.7 sec pace (with equiv. R25Bs 10" on 8" wide rims). Fuel consumption is estimated 0.144 L/lap. Concerns here are the 2.0 m^2 to 0.5 m^2 ratio (L/D = -4, okey...
9. ## Thread: Simulate what you can test and test what you can simulate

by rory.gover
Replies
19
Views
11,785

### I am aware of a number of teams looking into the...

I am aware of a number of teams looking into the relaxation data based on your TTC posts. How far they are towards instituting it into a viable simulation and specification tool, I am unsure.
...
10. ## Thread: Simulate what you can test and test what you can simulate

by rory.gover
Replies
19
Views
11,785

### Bill, I thought you might enjoy the below paper...

Bill, I thought you might enjoy the below paper as well. Would be relatively easy to get tyre relaxation data from TTC, get Fy and Mz compliance effects in (that data is harder to come by for FSAE...
11. ## Thread: Two simple rules to improve results.

by rory.gover
Replies
109
Views
40,522

### Build a 150kg car, put 50 kg of tungsten right...

Build a 150kg car, put 50 kg of tungsten right below the CG. Better yet, have it adjustable so you put it rearward and high (maximise long. load transfer and attempt to lift front wheels) for...
12. ## Thread: A new free vehicle dynamics resource - Dan's Vehicle Dynamics Corner

by rory.gover
Replies
291
Views
121,820

### Be aware that a hand-calc is a model as well, and...

Be aware that a hand-calc is a model as well, and as such, should undergo its own assessment. You are attempting to model some aspect of reality using a algebraic representation. Just because it is...
13. ## Thread: A new free vehicle dynamics resource - Dan's Vehicle Dynamics Corner

by rory.gover
Replies
291
Views
121,820

### There is a difference between validation and...

There is a difference between validation and verification. It's well understood in some areas of engineering, but not properly parsed in other areas.
...
14. ## Thread: Make Do-It-Yourself Sideslip Sensor.

by rory.gover
Replies
7
Views
5,558

### Can't speak to the accuracy of all the content,...

Can't speak to the accuracy of all the content, but: http://journals.sfu.ca/vte-j/index.php/vte-j/article/view/6/11
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