MBSE VS DBSE
alternative method DBSE
Document Base System Engineering
manually generate some subset
test case specifications
system design specifications
requirements specifications
concept of operations documents
disjoint set of text documents, spreadsheets, diagrams, and presentations and store them in a disjointed or messy set of repositories
Completeness, consistency, and relationships between requirements, design, engineering analysis, and test information are difficult to assess since this information is spread
Difficult to assess change impacts
Difficult to perform traceability
Standard practice MBSE
Model- Base System Engineering
primary deliverables are not set of documents
same life cycle as DBSE
System model
System model includes system specification, design, analysis, and verification information
Enhances the quality of traceability and change impact assessments
provide a more complete, consistent, and traceable system design
Definition
Model-Based Systems Engineering (MBSE) is the formalized application of modeling to support system requirements, design, analysis, verification, and validation activities beginning in the conceptual design phase and continuing throughout development and later life cycle phases
which enhance
Specification and design precision
Communication
System design integration
Re-use of system artifacts
System Model
Advantage
to design a system that satisfies system requirements and allocates requirements to the system's components
consist of elements
includes info on
Analysis
Verification
Design
System specification
Purpose
scope of the modeling effort is determined by the purpose, which includes breadth, depth, and fidelity of the model.
scope should be balanced with schedule, budget, and skill levels.
determines the expected results, stakeholders, and intended use of the model.
purpose and scope help establish realistic expectations for the modeling effort
requires a clearly defined purpose.
Product quality
manage system complexity
ability to teach and learn system engineering fundamental
3 pillars
Modeling language
Modeling method
Modeling tool
The capability to construct and read well-formed models is at the heart of the MBSE approach
t's a documented set of design tasks that a modeling team performs to create a system model.
designed and implemented to comply with the rules of one or more modeling languages, enabling you to construct well-formed models in those languages.
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Design elements
Test Case
Requirements
Design Rationale
Interrelationship
SysML Diagrams
Behavior
Requirement
Structure
Sequence
State machine
Activity
Use Case
Internal Block
Package
Block Definition
Parametric
functionality in terms of how a system or other entity is used by external entities
represents text-based requirements and their relationship with other requirements, design elements and test cases to support requirements traceability
represents structural elements called blocks and their composition and classification
represents interconnection and interfaces between the parts of a block
represent behavior of an entity in terms of its transitions between triggered by events
represent behavior in terms of ordering of actions base on availability of input, output and control and how the actions transform the inputs to output
represent behavior in terms of a sequence of messages exchanged between parts
represents constraints on property values used to support engineering analysis
represents the organisation of a model in terms of packages that contain model elements