Tire (Simple)

Slip-free tyre model with minimum parameters.

tire simple

Description

The Tire (Simple) block is a simple slip-free tyre model that you parameterise by the tyre radius.

You can optionally add inertia, stiffness or damping. These dynamic characteristics require additional calculations, which may make the model less suitable for real-time simulation.

Ports

Conserving

# A — axis
`rotational mechanics

Details

A mechanical rotational port connected to the axle on which the tyre sits.

Program usage name

axle_flange

# H — hub
translational mechanics

Details

A mechanical progressive port connected to the wheel hub and transmitting the traction generated by the tyre to the rest of the vehicle.

Program usage name

hub_flange

Parameters

Main

# Rolling radius — radius
m | cm | ft | in | km | mi | mm | um | yd

Details

The rolling radius of the tyre. The value must be .

Units	`m` \| `cm` \| `ft` \| `in` \| `km` \| `mi` \| `mm` \| `um` \| `yd`
Default value	`0.3 m`
Program usage name	`tire_radius`
Evaluatable	Yes

# Compliance — elastic deformation

Details

Incorporating longitudinal stiffness and damping.

Default value	`false (switched off)`
Program usage name	`enable_compliance`
Evaluatable	No

# Longitudinal stiffness — longitudinal rigidity
N/m | lbf/ft | lbf/in

Details

Longitudinal stiffness of the tyre. The value must be .

Dependencies

To use this parameter, select the Compliance parameter check box.

Units	`N/m` \| `lbf/ft` \| `lbf/in`
Default value	`1.0e6 N/m`
Program usage name	`k`
Evaluatable	Yes

# Longitudinal damping — longitudinal damping
kg/s | N*s/m | N/(m/s) | lbf/(ft/s) | lbf/(in/s)

Details

Longitudinal damping of the tyre. The value must be .

Dependencies

To use this parameter, select the Compliance parameter check box.

Units	`kg/s` \| `N*s/m` \| `N/(m/s)` \| `lbf/(ft/s)` \| `lbf/(in/s)`
Default value	`1000.0 N/(m/s)`
Program usage name	`C`
Evaluatable	Yes

# Inertia — inertia model

Details

Inclusion of tyre inertia.

Default value	`false (switched off)`
Program usage name	`enable_inertia`
Evaluatable	No

Details

Tyre rotational inertia.

Dependencies

To use this parameter, select the Inertia check box.

Units	`gcm^2` \| `kgm^2` \| `lbmft^2` \| `lbmin^2` \| `slugft^2` \| `slugin^2`
Default value	`1.0 kg*m^2`
Program usage name	`I_tire`
Evaluatable	Yes

# Initial velocity — initial speed
rpm | deg/s | rad/s

Details

Initial rotational speed of the tyre.

Dependencies

To use this parameter, select the Inertia check box.

Units	`rpm` \| `deg/s` \| `rad/s`
Default value	`0.0 rad/s`
Program usage name	`w_start`
Evaluatable	Yes