Difference between revisions of "Human Vibration"

Before calculating the indicators in the toolkit, you must define a filter for each direction. Filters will be selected in accordance with the desired result (Hand-arms; Whole-Body, ..) and the direction of the measurement as specified in the table [[Human_Vibration#Time-weighting_filters|describing the filters]]. Filters will be applied to the signal before calculating the indicators, but the time-filtered signal will not be saved. <br><br>

You will then need to enter the reference time you want to use to estimate the parameters on a greater duration. This duration must be entered in second. The default value is 288500 second, corresponding to a 8 hour measurement:<br><br>

You will finally need to enter the MTVV Tau value. The MTVV Tau is the integration time in seconds used for the calculation of the MTVV. The ISO 2651 recommends using 1sec. This is the default value of the setting.<br>

Once the filters are selected and the parameters competed, you can select the metrics you want to calculate by checking the different boxes.<br><br>

Here, we are calculating all the indicators for the "Seat_Pad_Measurement" signal. This signal contains 3 Tracks, one for each channel X, Y and Z of a three axis accelerometer. As we want to calculate the multi-axis metrics, we also define a sensor on the three tracks, called "Seat_Pas_3axis". <br><br>

Once completed, the result can be found in the currently opened project in the [[NVGate Project manager]]. A new measurement called "NAME_OF_THE_Signal_out" containing the result is created. <br>

Each indicator is calculated for each direction and for each track of the signal. The name of the result contains the name of the track, the considered direction and the filter used for that direction (except for the <math>D_k</math> which use specific filters).<br>

The following picture shows the indicators for the first track (SeatPadX) of the signal : <br><br>

For the metrics estimated on the "Reference Time", the name of the indicator is followed by "(Ref_Time_in_Second"). Here an example with the VDV metric, the name of the indicator is displayed in the window title : <br>

The metrics combining the three directions (av, Se, Ah,...) are named as following : "METRICS_Name : Sensor". Here is an example for Se :