StaticTrim

class sharpy.solvers.statictrim.StaticTrim

The StaticTrim solver determines the longitudinal state of trim (equilibrium) for an aeroelastic system in static conditions. It wraps around the desired solver to yield the state of trim of the system, in most cases the StaticCoupled solver.

It calculates the required angle of attack, elevator deflection and thrust required to achieve longitudinal equilibrium. The output angles are shown in degrees.

The results from the trimming iteration can be saved to a text file by using the save_info option.

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

Name	Type	Description	Default
print_info	bool	Print info to screen	True
solver	str	Solver to run in trim routine
solver_settings	dict	Solver settings dictionary	{}
max_iter	int	Maximum number of iterations of trim routine	100
fz_tolerance	float	Tolerance in vertical force	0.01
fx_tolerance	float	Tolerance in horizontal force	0.01
m_tolerance	float	Tolerance in pitching moment	0.01
tail_cs_index	['int', 'list(int)']	Index of control surfaces that move to achieve trim	0
thrust_nodes	list(int)	Nodes at which thrust is applied	[0]
initial_alpha	float	Initial angle of attack	0.0
initial_deflection	float	Initial control surface deflection	0.0
initial_thrust	float	Initial thrust setting	0.0
initial_angle_eps	float	Initial change of control surface deflection	0.05
initial_thrust_eps	float	Initial thrust setting change	2.0
relaxation_factor	float	Relaxation factor	0.2
save_info	bool	Save trim results to text file	False

trim_algorithm()

Trim algorithm method

The trim condition is found iteratively.

Returns:

array of trim values for angle of attack, control surface deflection and thrust.

Return type:

np.array