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Ansoft Designer / Ansys Designer 在线帮助文档：

Variables in Designer >
Defining an Expression

Defining an Expression

Expressions are mathematical descriptions that typically contain Intrinsic Functions such as sin(x) and/or arithmetic operators such as +, -, /, and *. Expressions in Designer may also contain pre-defined constants, but such constants may not be reassigned a new value. The Constants tab of the Project Variables dialog lists the available pre-defined constants. These may not be reassigned a new value. Defining one variable in terms of another makes a dependent variable. Additionally, dependent variables, though useful in many situations, cannot be the direct subject of optimization, sensitivity analysis, tuning, or statistical analysis.

Name	Value	Description
abs0	-273.15
Boltz	1.3806503E-023	Boltzmann constant (J/K)
c0	299792458	Speed of light in vacuum (m/s)
elecq	8.854187817e-012	Permittvity of vaccum (F/m)
eta	376.730313461	Electron Charge (C)
g0	9.80665
mathE	2.718281828
pi	3.14159265358979	Ratio of circle circumference
planck	6.6260755e-034
u0	1.25663706143582e-066	Permeability of vacuum (H/m)

Numerical values may also be used in expressions, and can be entered using Ansoft’s shorthand for scientific notation (i.e., 5x10⁷ may be entered as 5e7).

The topics for this section include:

Operator Precedence

Mathematical Functions

Range Functions

Intrinsic Functions

Pre-Defined Constants

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