rolland.discretization.DiscretizationEBBVerticConst¶

class rolland.discretization.DiscretizationEBBVerticConst(*args, **kwargs)[source]¶

Bases: DiscretizationEBBVertic

Discretization with non-time-dependent parameters according to Stampka and Sarradj [4].

The parameters are constant over time. Only applicable for non-moving sound sources and linear superstructure properties.

track¶

Track instance.

Type:: Track

dt¶

Step size in time \([s]\).

Type:: float

req_simt¶

Requested simulation time \([s]\).

Type:: float

bx¶

Stability coefficient for dx calculation (must be \(b_x \geq 1\)) \([-]\).

Type:: float

nt¶

Number of time steps \([-]\).

Type:: int

sim_t¶

Actual simulation time \([s]\).

Type:: float

dx¶

Step size in space \([m]\).

Type:: float

bx_upd¶

Updated stability coefficient \([-]\).

Type:: float

nx¶

Number of spatial steps \([-]\).

Type:: int

bound¶

Boundary instance.

Type:: PMLRailDampVertic

A¶

Coefficient matrix A.

Type:: scipy.sparse.csc_matrix

B¶

Coefficient matrix B.

Type:: scipy.sparse.csc_matrix

C¶

Coefficient matrix C.

Type:: scipy.sparse.csc_matrix

vec_dr¶

Rail damping vector.

Type:: numpy.ndarray

vec_sp¶

Pad stiffness vector.

Type:: numpy.ndarray

vec_dp¶

Pad damping vector.

Type:: numpy.ndarray

vec_ms¶

Sleeper/Slab mass vector.

Type:: numpy.ndarray

vec_sb¶

Ballast stiffness vector.

Type:: numpy.ndarray

vec_db¶

Ballast damping vector.

Type:: numpy.ndarray

validate_discretization()[source]¶: Validate the discretization.

validate_discretization_stampka()[source]¶: Validate the discretization according to Stampka.

initialize_vectors()[source]¶: Initialize the vectors.

add_boundary_conditions()[source]¶

Add boundary conditions to the rail damping vector.

This method modifies the rail damping vector (vec_dr) by adding the boundary conditions from the Perfectly Matched Layer (PML) at both ends of the grid.

build_superstructure_vectors()[source]¶

Handle track-specific logic.

This method initializes the superstructure property vectors based on the type of track.

Parameters:: None
Return type:: None

build_discrete_slab_track()[source]¶

Build discrete slab track.

Properties are assigned to the corresponding mounting positions.

Parameters:: None
Return type:: None

build_discrete_ballasted_track()[source]¶

Build discrete ballasted track.

Properties are assigned to the corresponding mounting positions.

Parameters:: None
Return type:: None