In the Sensor value definitions dialog, you can define sensor types and describe the basis on which the sensor values are determined and which parameters are available.
Measured value
The concept of the dialog is based on the 'Value source'. Four options are available for selection in the list:
- User-defined | Single (see image Dialog 'Sensor value definitions')
- User-defined | Feature (see image Value source 'User-defined | Feature')
- RFEM | Single (see image Value source 'RFEM | Single')
- RFEM | Feature (see image Value source 'RFEM | Feature')
x-Value / y-Value
For the value source User-defined | Single or User-defined | Feature, you define the designations and parameters for the measured value individually. If a deformation is present, you can, for example, describe the value with 'uz', specify the unit as 'mm', and the decimal places as '1', as shown in the image above. For a noise source, on the other hand, you could enter 'Lp' as the value and 'dB' as the unit.
Information on 'Symbol | HTML' and 'Variable name' is helpful if you want to import the measured data via parameterized functions.
When describing the value source as a feature – 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 offers a selection that allows you to cover various use cases:
- Double (Double precision)
- Date and time
- Date
- String ([https://en.wikipedia.org/wiki/String_(computer_science) String])
Source
For the value source RFEM | Single or RFEM | Feature, you specify which RFEM results are to be 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 RFEM feature, you can define the parameters of a diagram using the 'Result type' and 'Feature result type' lists.
The criteria are basically defined in the same way as for calculation diagrams of RFEM 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 triggers 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 feature, you can specify which limit value is relevant for the 'Determination of sensor status' in a list.
Referenced value
This section is displayed for the value source 'RFEM | Single' (see image Value source 'RFEM | Single'). Here, you can specify which deviations and hit rates of measured results are permissible for the calculated results. 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.
