se-lib

se-lib

Original author(s)	Ray Madachy
Developer(s)	Ryan Longshore
Initial release	November 30, 2022 (2022-11-30)
Stable release	0.27.4 / October 19, 2023 (2023-10-19)
Written in	Python
Engine
Operating system	Cross-platform
Type	Systems Modeling
License	MIT
Website	se-lib.org

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The Systems Engineering Library (se-lib) is a free and open-source library written in Python. Current capabilities for systems modeling include SysML and UML textual notation and diagrams, other modeling diagram types, time-based simulation including discrete event modeling and continuous systems modeling with system dynamics, system reliability modeling, system cost modeling, and systems engineering process and project management. It is interoperable with other modeling tools.

Overview

The goals of se-lib are to :

• Lower access barrier to system modeling with open source tool environment.
• Provide integrated capabilities for systems modeling, analysis, and documentation
• Be digital engineering compliant.
• Compatibility with other modeling tools and libraries
• Compatibility of everything on desktop and cloud platforms

se-lib was originally called the Python Modeling Library (PyML), and was renamed to be more specific for systems engineering applications.

Examples

SysML and UML

The following generates a use case model diagram:

import selib as se

# system model
system_name = "Course Portal"
actors = ['Student', 'Instructor']
use_cases = ['Post Discussion', 'Take Quiz', 'Create Quiz']
interactions = [('Student', 'Post Discussion'), ('Instructor', 'Post Discussion'), ('Student', 'Take Quiz'), ('Instructor', 'Create Quiz')]
use_case_relationships = []

# create diagram
se.use_case_diagram(system_name, actors, use_cases, interactions, use_case_relationships, filename=system_name+'use case diagram.pdf')

Discrete Event Simulation

A discrete event model for electric car charging is:

# electric car charging simulation
init_de_model()

add_source('incoming_cars',
           entity_name="Car",
           num_entities = 50,
           connections={'charger': .7, 'impatient_cars': .3},
           interarrival_time='np.random.exponential(5)')

add_server(name='charger',
           connections={'payment': 1},
           service_time='np.random.uniform(0, 16)',
           capacity = 1)

add_delay(name='payment',
           delay_time = 'np.random.uniform(1, 3)',
           connections={'served_cars': 1},)

add_terminate('served_cars')
add_terminate('impatient_cars')

draw_model_diagram()

model_data, entity_data = run_model()
plot_histogram(model_data['charger']['waiting_times'], xlabel="Charger Waiting Time")

External links

• GitHub repository

This article "Se-lib" is from Wikipedia. The list of its authors can be seen in its historical and/or the page Edithistory:Se-lib. Articles copied from Draft Namespace on Wikipedia could be seen on the Draft Namespace of Wikipedia and not main one.

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