Package Constants (14)

e	Value: Modelica.Constants.e Type: Real Description: Euler's number also known as Napier's constant
eps	Value: ModelicaServices.Machine.eps Type: Real Description: Biggest number such that 1.0 + eps = 1.0
inf	Value: Modelica.Constants.inf Type: Real Description: Infinity
INF	Value: inf Type: Real Description: Infinity
pi	Value: Modelica.Constants.pi Type: Real Description: Ratio of a circle's circumference to its diameter (π)
small	Value: ModelicaServices.Machine.small Type: Real Description: Smallest number such that small and -small are representable on the machine
timeBaseUnits	Value: {"s", "min", "h", "d", "wk", "mo", "qtr", "yrCal"} Type: String[TimeBases] Description: Unit strings for model time bases
timeBaseRateUnits	Value: {"1/s", "1/min", "1/h", "1/d", "1/wk", "1/mo", "1/qtr", "1/yrCal"} Type: String[TimeBases] Description: Unit strings for rates matching time bases
rateStrings	Value: {"per second", "per minute", "per hour", "per day", "per week", "per month", "per quarter", "per year"} Type: String[TimeBases] Description: Rate strings for different time bases
timeBaseConversionFactors	Value: [1, 1 / 60, 1 / 3600, 1 / 86400, 1 / 604800, 1 / 2629746, 1 / 7889238, 1 / 31556952; 60, 1, 1 / 60, 1 / 1440, 1 / 10080, 10 / 438291, 10 / 1314873, 5 / 2629746; 3600, 60, 1, 1 / 24, 1 / 168, 200 / 146097, 200 / 438291, 50 / 438291; 86400, 1440, 24, 1, 1 / 7, 1600 / 48699, 1600 / 146097, 400 / 146097; 604800, 10080, 168, 7, 1, 1600 / 6957, 1600 / 20871, 400 / 20871; 2629746, 438291 / 10, 146097 / 200, 48699 / 1600, 6957 / 1600, 1, 1 / 3, 1 / 12; 7889238, 1314873 / 10, 438291 / 200, 146097 / 1600, 20871 / 1600, 3, 1, 1 / 4; 31556952, 2629746 / 5, 438291 / 50, 146097 / 400, 20871 / 400, 12, 4, 1] Type: Real[TimeBases,TimeBases] Description: Conversion factors for time base conversions
unspecified	Value: inf Type: Real Description: Unspecified as an alias for 'inf' to indicate potential inputs in some cases
unspec	Value: zero Type: Real Description: Unspecified as an alias for 'zero' to indicate potential inputs in some cases
zero	Value: -1e-10 Type: Real Description: Constant that is negative but close enough to zero to be considered effectively zero
'1each'	Value: 1 Type: Amount (#) Description: Define the amount of one `each` for counting

Information

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This package contains some common constants that are considered useful for system dynamics modeling and simulation.

Notes

It is generally advisable to set up models in SIunits of time so that they will be compatibale with models from other domains. To enter and display times and rates in a convenient fashion the displayUnit attribute should be used. This should be conveniently handled by Modelica tools which most often will allow to make such a choice by drop-down menu.

In that sense, the constants timeBaseUnits and timeBaseConversionFactors are usually not needed.

Constants

Package Constants (14)

Information

Notes

See also

Revisions