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 Random error
The total error – the difference between the exact and computed response - is composed of a random and a bias component. The random component is, as the name implies, a random deviation from the nominal value of the exact response, often assumed to be normally distributed around the nominal value. (See also bias error).
Reliability-based Design optimization.
 Reasonable design space
A subregion of the design space within the region of interest. It is bounded by lower and upper bounds of the response values.
 Region of interest
A sub-region of the design space. Usually defined by a mid-point design and a range of each design variable. Usually dynamic.
 Reliability-based design optimization (RBDO)
The performing of design optimization while considering reliability-based failure criteria in the constraints of the design optimization formulation. This implies the inclusion of random variables in the generation of responses and then extracting the standard deviation of the responses about their mean values due to the random variance and including the standard deviation in the constraint(s) calculation.
The difference between the computed response (using simulation) and the predicted response (using a response surface).
A numerical indicator of the performance of the design. A function of the design variables approximated using a metamodel which can be used for optimization. Symbolized by f. Collected over all design iterations for plotting. (See also history).
 Response quantity
See response.
 Response Surface
A mathematical expression which relates the response variables to the design parameters. Typically computed using statistical methods.
A numerical indicator of the performance of the design. A result is not associated with a metamodel, but is typically used for intermediate calculations in metamodel-based analysis.
Response Surface Methodology.