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Constraint blocks can be used to specify a network of constraints that represent mathematical expressions such as {F=m*a} and {a=dv/dt}, which constrain the physical properties of a system.

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Figure D.26 - Defining Analyses for Hybrid SUV Engineering Development (Block Definition Diagram)
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OMG Systems Modeling Language (SysML) 1.6
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About Object Management Group copyright in text extracts quoted from OMG specifications for educational purposes
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INFO
UML keywords
Constraint
SysML keywords
ConstraintBlock
Keywords
Constraint blocks provide a mechanism for integrating engineering analysis such as performance and reliability models with other SysML models.
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Constraint blocks can be used to specify a network of constraints that represent mathematical expressions such as {F=m*a} and {a=dv/dt}, which constrain the physical properties of a system.
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Such constraints can also be used to identify critical performance parameters and their relationships to other parameters, which can be tracked throughout the system life cycle.
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Constraint blocks provide a mechanism for integrating engineering analysis such as performance and reliability models with other SysML models.
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A constraint block is defined by a keyword of «constraint» applied to a block definition. Properties of this block define parameters of the constraint, with the exception of properties that hold internally nested usages of constraint blocks.
The usage of a constraint block is distinguished from other parts by a box having rounded corners rather than the square corners of an ordinary part.
A parametric diagram is a restricted form of internal block diagram that shows only the use of constraint blocks along with the properties they constrain within a context.
Figure D.26 defines the various model elements that will be used to conduct analysis in this example. It depicts each of the constraint blocks/equations that will be used for the analysis, and key relationships between them.
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