In the Sensor value definitions dialog, you can define sensor types and describe the basis on which the sensor's values are determined and which parameters are available.
Measured Value
The concept of the dialog is tailored to the 'Value source'. The list provides four options to choose from:
- User-defined | Single (see image Dialog 'Sensor value definitions')
- User-defined | Function (see image Value source 'User-defined | Function')
- RSTAB | Single (see image Value source 'RFEM | Single')
- RSTAB | Function (see image Value source 'RFEM | Function')
x-value / y-value
For the value source User-defined | Single or User-defined | Function, you define the designations and parameters for the measured value individually. If a deformation is present, for example, as shown in the image above, you can describe the value as 'uz', set the unit as 'mm', and the decimal places as '1'. For a noise source, on the other hand, you could enter 'Lp' as the value and 'dB' as the unit.
Specifications for 'Symbol | HTML' and 'Variable name' are helpful if you import the measured data via parameterized functions.
When describing the value source as a function – for example, to represent the dependency of a value on time – you can define the parameters of the abscissa and ordinate of a diagram in the 'x-value' and 'y-value' sections.
For the x-value of the abscissa axis, the 'Data type' list provides a selection that allows you to capture different use cases:
- Double (Double precision)
- Date and time
- Date
- String ([https://en.wikipedia.org/wiki/String_(computer_science) Character string])
Source
For the value source RSTAB | Single or RSTAB | Function, you specify which RSTAB results are used for the measured value.
Select the 'Analysis type' (Static analysis, modal analysis, etc.) and the 'Load case' or 'Load combination' with the corresponding results. Result combinations and design situations are not suitable for sensor value definitions, as they provide enveloping results.
Then define the 'Result type' (Internal force, deformation, support force, strain, etc.) and the relevant 'Value', for example, the deformation in a specific direction or the strain related to an axis.
When describing the value source as an RSTAB function, you can define the parameters of a diagram using the 'Result type' and 'Function result type' lists.
The criteria are defined in essentially the same way as for Calculation diagrams of RSTAB results.
Limit Values
In this section, you define the values for the 'Warning limit' and the 'Alarm limit'. The associated ranges are assigned corresponding colors:
- Green: The measured value is within the acceptable range.
- Yellow: The measured value leads to a warning.
- Red: The measured value triggers an alarm.
The colors are used in the Measured values tab for the status indication of the sensor measurements.
If the value source is based on a function, you can use a list to specify which limit value is relevant for the 'Determination of sensor status'.
Referenced Value
This section is displayed for the value source 'RSTAB | Single' (see image Value source 'RFEM | Single'). Here, you can specify for the calculated results which deviations and hit rates of measurement results are permissible. This is helpful, for example, for comparing wind simulations with results from wind tunnel tests. For instance, the WTG guideline [1] defines an evaluation function based on a hit rate q of the prediction model using the "correctly" calculated result values compared to sufficiently significant comparison values.
The results of the statistical evaluation are output in the Sensor sets dialog.
