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POEM ID: 017
Title: User can specify units when adding design variables, constraints, and objectives.
authors: Kenneth-T-Moore (Ken Moore)
Competing POEMs: [N/A]
Related POEMs: [N/A]
Associated implementation PR: OpenMDAO/OpenMDAO#1265

Status:

  • Active
  • Requesting decision
  • Accepted
  • Rejected
  • Integrated

Motivation

Description

The add_design_var, add_constraint, and add_objective signatures will be modified to take a units argument, e.g.

        prob.model.add_design_var('indeps.x', lower=-50, upper=50, units='ft')

OpenMDAO will check compatibility, and raise an exception if the target is incompatible or has no units. All other arguments are considered to be specified in the units defined in "units". Internally, the unit conversion will be added to existing driver scaling, with unit conversion factor applied first, then the scaler/adder or ref/ref0.