Description
Base class for a steerable leaf-spring solid axle suspension. Derived from ChSuspension, but still an abstract base class.
This implementation follows the SAE Spring Design Handbook, which shows the use of a kinematic leafspring model made of three links. The three 'links' are front leaf / clamp / rear leaf / shackle. The clamp is considered as rigid and part of the axle tube in the SAE book. In this chrono model we had to split the clamp into two separate bodies clampA and clampB. Both are connected via a rotational joint around Z. This was necessary because we need to mimic the lateral compliance of the leafspring. The leaves (front and rear) are connected to clampA rsp. clampB via rotational joints around Y. The frontleaf also connects to the chassis with a spherical joint, while the rearleaf connects to the shackle body with a sperical joint. The shackle body connects to the chassis via a rotational joint around Y.
The vertical stiffnesses are simulated by the rotational springs of the frontleaf and the rearleaf while the lateral stiffnesses are simulated by the rotational joints of the clamp bodies.
For the stiffness parameters the user can take the desired translatoric vertical stiffness devided by two (we have two leaves). The preload can be set as a vertical force devided by two. The conversion to the rotary setup is made automatically.
The SAE model allows to consider the correct axle movement due to wheel travel. It is possible to consider the tie-up mode due to longitudinal forces (breaking). It also possible to use different stiffnesses for the front leaf and the rear leaf, many practical designs use this to avoid tie-up problems.
The suspension subsystem is modeled with respect to a right-handed frame, with X pointing towards the front, Y to the left, and Z up (ISO standard). The suspension reference frame is assumed to be always aligned with that of the vehicle. When attached to a chassis, only an offset is provided. The suspension subsystem is modeled with respect to a right-handed frame, with X pointing towards the front, Y to the left, and Z up (ISO standard). The suspension reference frame is assumed to be always aligned with that of the vehicle. When attached to a chassis, only an offset is provided.
All point locations are assumed to be given for the left half of the suspension and will be mirrored (reflecting the y coordinates) to construct the right side.
Classes | |
| class | chrono::vehicle::ChAxle |
| Base class for a suspension subsystem. More... | |
| class | chrono::vehicle::ChSuspension |
| Base class for a suspension subsystem. More... | |
| class | chrono::vehicle::ChDoubleWishbone |
| Base class for a double-A arm suspension modeled with bodies and constraints. More... | |
| class | chrono::vehicle::ChDoubleWishboneReduced |
| Base class for a double-A arm suspension modeled with distance constraints. More... | |
| class | chrono::vehicle::ChHendricksonPRIMAXX |
| Base class for a Hendrickson PRIMAXX EX suspension. More... | |
| class | chrono::vehicle::ChLeafspringAxle |
| Base class for a leaf-spring solid axle suspension. More... | |
| class | chrono::vehicle::ChMacPhersonStrut |
| Base class for a MacPherson strut modeled with bodies and constraints. More... | |
| class | chrono::vehicle::ChMultiLink |
| Base class for a multi-link suspension modeled with bodies and constraints. More... | |
| class | chrono::vehicle::ChRigidPinnedAxle |
| Base class for a rigid suspension with a pinned axle. More... | |
| class | chrono::vehicle::ChRigidSuspension |
| Base class for a rigid suspension, i.e. More... | |
| class | chrono::vehicle::ChSAELeafspringAxle |
| Base class for a leaf-spring solid axle suspension. More... | |
| class | chrono::vehicle::ChSemiTrailingArm |
| Base class for a semi-trailing arm suspension (non-steerable). More... | |
| class | chrono::vehicle::ChSingleWishbone |
| Base class for a double-A arm suspension modeled with bodies and constraints. More... | |
| class | chrono::vehicle::ChSolidAxle |
| Base class for a solid axle suspension modeled with bodies and constraints. More... | |
| class | chrono::vehicle::ChSolidBellcrankThreeLinkAxle |
| Base class for a coil-spring or air-spring solid axle suspension, typically combined with the rotary arm steering. More... | |
| class | chrono::vehicle::ChSolidThreeLinkAxle |
| Base class for a coil-spring or air-spring solid axle suspension. More... | |
| class | chrono::vehicle::ChThreeLinkIRS |
| Base class for a 3-link independent rear suspension (non-steerable). More... | |
| class | chrono::vehicle::ChToeBarLeafspringAxle |
| Base class for a steerable leaf-spring solid axle suspension. More... | |
| class | chrono::vehicle::DoubleWishbone |
| Double-A arm suspension constructed with data from file. More... | |
| class | chrono::vehicle::DoubleWishboneReduced |
| Reduced double-A arm suspension constructed with data from file. More... | |
| class | chrono::vehicle::HendricksonPRIMAXX |
| Hendrickson PRIMAXX suspension constructed with data from file. More... | |
| class | chrono::vehicle::LeafspringAxle |
| Leaf-spring solid axle suspension constructed with data from file. More... | |
| class | chrono::vehicle::MacPhersonStrut |
| MacPherson strut suspension constructed with data from file. More... | |
| class | chrono::vehicle::MultiLink |
| Multi-link suspension constructed with data from file. More... | |
| class | chrono::vehicle::RigidPinnedAxle |
| Rigid suspension with pinned axle constructed with data from file. More... | |
| class | chrono::vehicle::RigidSuspension |
| Rigid suspension constructed with data from file. More... | |
| class | chrono::vehicle::SAELeafspringAxle |
| Leaf-spring solid axle suspension constructed with data from file. More... | |
| class | chrono::vehicle::SAEToeBarLeafspringAxle |
| Steerable leaf-spring solid axle suspension constructed with data from file. More... | |
| class | chrono::vehicle::SemiTrailingArm |
| Semi-trailing arm suspension constructed with data from file. More... | |
| class | chrono::vehicle::SingleWishbone |
| Single A-arm suspension constructed with data from file. More... | |
| class | chrono::vehicle::SolidAxle |
| Solid axle suspension constructed with data from file. More... | |
| class | chrono::vehicle::SolidBellcrankThreeLinkAxle |
| solid axle suspension constructed with data from file. More... | |
| class | chrono::vehicle::SolidThreeLinkAxle |
| Leaf-spring solid axle suspension constructed with data from file. More... | |
| class | chrono::vehicle::ThreeLinkIRS |
| Three-link Independent Rear Suspension constructed with data from file. More... | |
| class | chrono::vehicle::ToeBarLeafspringAxle |
| Steerable leaf-spring solid axle suspension constructed with data from file. More... | |
Typedefs | |
| typedef std::vector< std::shared_ptr< ChAxle > > | chrono::vehicle::ChAxleList |
| Vector of handles to axle subsystems. | |
| typedef std::vector< std::shared_ptr< ChSuspension > > | chrono::vehicle::ChSuspensionList |
| Vector of handles to suspension subsystems. | |
