LinearAssembler¶

class sharpy.solvers.linearassembler.LinearAssembler[source]¶

Warning

Under development - please advise of new features and bugs!

Creates a workspace containing the different linear elements of the state-space.

The user specifies which elements to build sequentially via the linear_system setting.

The most common uses will be:

Aerodynamic: sharpy.linear.assembler.LinearUVLM solver

Structural: sharpy.linear.assembler.LinearBeam solver

Aeroelastic: sharpy.linear.assembler.LinearAeroelastic solver

The solver enables to load a user specific assembly of a state-space by means of the LinearCustom block.

See sharpy.sharpy.linear.assembler.LinearAssembler for a detailed description of each of the state-space assemblies.

Upon assembly of the linear system, the data structure data.linear will be created. The Linear contains the state-space as an attribute. This state space will be the one employed by postprocessors.

Important: running the linear routines requires information on the tangent mass, stiffness and gyroscopic structural matrices therefore the solver solvers.modal.Modal must have been run prior to linearisation. In addition, if the problem includes rigid body velocities, at least one timestep of solvers.DynamicCoupled must have run such that the rigid body velocity is included.

Example:

The typical flow setting used prior to using this solver for an aeroelastic simulation with rigid body dynamics will be similar to:

>>> flow = ['BeamLoader',
>>>        'AerogridLoader',
>>>        'StaticTrim',
>>>        'DynamicCoupled',  # a single time step will suffice
>>>        'Modal',
>>>        'LinearAssembler']

The settings that this solver accepts are given by a dictionary, with the following key-value pairs:

Name	Type	Description	Default	Options
`linear_system`	`str`	Name of chosen state space assembly type	`None`
`linear_system_settings`	`dict`	Settings for the desired state space assembler	`{}`
`linearisation_tstep`	`int`	Chosen linearisation time step number from available time steps	`-1`
`modal_tstep`	`int`	Timestep in which modal information is stored. Useful if the `Modal` solver is run at the start of the SHARPy flow.	`-1`
`inout_coordinates`	`str`	Input/output coordinates of the system. Nodal or modal space.		``, ``nodes, `modes`
`retain_inputs`	`list(int)`	List of input channels to retain in the chosen `inout_coordinates`.	`[]`
`retain_outputs`	`list(int)`	List of output channels to retain in the chosen `inout_coordinates`.	`[]`