Soft dB Tenor 24bits Data User Guide - Manual (Page 47)

Tenor Data Logger Soft dB inc.
5.3.2 Integral x(t)
This function performs a time integration on the signal of a group of selected channels.
Some modules in the analysis functions tab allow integration in the frequency domain. This
function is useful for analyzing the signal coming from an accelerometer, especially if the
speed and position must be analyzed in the time domain. There are many available
techniques for performing time integration. We select the filtering approach, which has the
advantage of being numerically stable. So, a simple first order or second order low-pass
filter is used to perform a simple or double integration. The user must specify a cut-off
frequency for the filter. We suggest using an Fcut(Hz) parameter that fits with the sensor
used. A typical accelerometer sensor has a flat frequency response that starts at around
20 Hz. The interface of the Integral x(t) function is shown in the next figure:
Figure 34: Time integration function interface
The parameters are described in the following table:
Parameter Description
A simple or double operation can be done. A first
(simple integration) or second order (double
integration) filter is used following this parameter.
This is the cut-off frequency for the filter used in the
integration process. We suggest using an Fcut(Hz)
parameter that fits with the sensor used. A typical
accelerometer sensor has a flat frequency response
that starts at around 20 Hz.
User Manual p. 47