- #1

alona1

- 2

- 0

i have a model car , with 2 engines and 2 wheels, without steering.

thanks.

You are using an out of date browser. It may not display this or other websites correctly.

You should upgrade or use an alternative browser.

You should upgrade or use an alternative browser.

In summary, the conversation is about finding a function for calculating the turning angle of a model car with two engines and two wheels without steering. The suggestion is to measure the radius of the curve using the width of the car and the relative speeds of the two wheels. The conversation also discusses how to measure or control the wheel position or rates using shaft encoders or stepper motors.

- #1

alona1

- 2

- 0

i have a model car , with 2 engines and 2 wheels, without steering.

thanks.

Engineering news on Phys.org

- #2

Baluncore

Science Advisor

2023 Award

- 15,167

- 9,025

What do you mean by turning angle? Maybe the radius r, of the curve measured from the midpoint of the car to the centre of the arc would be a better measure. If the car has a width w, with half width being h=w/2, then the radii of the two wheel tracks about the centre of the turn will be r–h and r+h. The relative speeds of the two wheels, u and v, will be proportional to the ratio of the radii.

u/v = (r-h) / (r+h) which I think will give you something like r = h * (u+v) / (u-v)

The sign of r should give you the direction of the turn.

- #3

alona1

- 2

- 0

I can't measure the radius r while the car is driving. I know the width W between both wheels and can control the velocities of the wheels.

Is there opportunity to know the angle of the curve by these? For example, for turning 30 degrees what velocities will be needed in each wheel?

- #4

Baluncore

Science Advisor

2023 Award

- 15,167

- 9,025

If you know the radius you can work out the distance you must travel to change direction by say 30°. Circumference = 2 Pi r,

therefore the distance needed to turn 30° is d = 2 π r * 30 / 360.

- #5

stedwards

- 416

- 46

Are you programming a boe-bot?

- #6

Baluncore

Science Advisor

2023 Award

- 15,167

- 9,025

How do you measure or control the wheel position or rates. Shaft encoders, stepper motors?

To calculate the turning angle for a 2 wheels car, you need to know the wheelbase of the car (the distance between the front and back wheels) and the radius of the turn. Then, you can use the formula *turning angle = arctan(wheelbase/radius)* to calculate the turning angle in radians. You can convert the result to degrees by multiplying it by 180/π.

Yes, the formula for calculating turning angle is the same for all 2 wheels cars. However, the wheelbase and radius values may vary depending on the specific car model and the turn being made.

The wheelbase can be measured by taking the distance between the front and back wheels of the car. The radius can be measured by finding the distance from the center of the car to the center of the turn.

Yes, the weight of the car can affect the turning angle. A heavier car may have a wider turning angle compared to a lighter car, as it requires more force to turn.

No, this formula is specifically for 2 wheels cars. Cars with more than 2 wheels have different steering mechanisms and require different calculations for turning angles.

- Replies
- 24

- Views
- 3K

- Replies
- 15

- Views
- 4K

- Replies
- 10

- Views
- 2K

- Replies
- 4

- Views
- 2K

- Replies
- 9

- Views
- 2K

- Replies
- 4

- Views
- 1K

- Replies
- 3

- Views
- 2K

- Replies
- 1

- Views
- 4K

- Replies
- 6

- Views
- 1K

- Replies
- 72

- Views
- 5K

Share: