Tutorial videos

How the acquisition sequence can be used to automatically update a set of settings such as Label, Node, Direction…?

This is very useful for modal acquisition for example.

How the NVGate sequencer can be used to update settings such as degree of freedom for modal purpose.

Create a sequence

This video shows how to create a sequence from a scratch to update measurement settings.

Import a sequence

This video shows how to import an Excel sequence into NVGate.

Measurement with a sequence

Once measurement is completed, the active sequence will update a set of settings such as Label, Node, Direction… Measurements are also labeled from sequence, as shown in this video.

Automatic measurement with a sequence

How to get a fully automated sequence of measurements.

How to analyze an imported sound and how to export results?

It compares the resolution of FFT spectrogram and auditory spectrogram, and shows how to use harmonic cursor.

How to build a setup using the force and response window?

This video explains the advantages of using force and response windowing for impact test.

FFT settings

In most cases uniform windowing is preferred but sometimes force/response windowing is required. This video shows how to change the type of windowing used in the FFT plug-in.

Add layout

Before setting up the response and force windowing, one has to overlay the raw time block and the weighted time block, as shown in this video.

Set the response window

The real time view allows to visualize how the windowing affects the FFT processing and to adjust the settings for a better damping estimation, as shown in this video.

Set the force window

The real time view allows to visualize how the windowing affects the FFT processing and to adjust the settings for a better damping estimation, as shown in this video.

How to automatically concatenate two partial circular arrays via merging two projects.

How to build a setup for impact test measurement and create an automatic report.

This video shows the important results that guarantee a good impact hammer metrology.

Select inputs

How to setup the input table with hammer and accelerometers and how to enter degrees of freedom, set up the sampling frequency

Display and save results

How to display and save the key results (coherence, FRF, autospectrum and triggered block) to monitor the quality of impact tests in real time.

Set the trigger

How to trigger a FFT analysis on an impact hammer using an edge detection event.

FFT settings

How to set the FFT plug-in to properly compute FRF, coherence and others. It is also shown ergonomic features such as accept mode.

Check the saved results

Basic results for modal purpose are FRF and coherence. This video shows how to check that the results will be properly saved before starting numerous measurements.

Update the DOF

Before each new impact location, node and direction (DOF) have to be updated. This video shows how to manually setup DOF easily.

Display the current block

When time blocks are long because of high resolution requirement, it is convenient to know if the impact has trigged the FFT analysis thanks to a progress bar.

Set the threshold

During a structure probing, surface stiffness can change (stiffer and softer). Therefore, it is necessary to adjust the impact threshold for triggering FFT.

Perform an autorange

During a structure probing, force or response can considerably change. Autorange allows to adjust the range peak automatically to optimize amplitude resolution.

Tip selection

How to select the right hammer tip regarding the frequency range of interest?

Reciprocity test

How to evaluate the sensor influence through the reciprocity test?

How to do modal analysis

From measurement setup and data acquisition, ODS animation, modes identification with different methods, real modes display, curve fitting check, MAC validation, to COMAC analysis.

Setup and data acquisition

This video shows how to setup the measurements and acquire data for modal analysis.

ODS animation

This video shows how to animate deflection shapes in frequency domain.

Modes identification

This video shows how to identify the modes with Narband and BroBand methods via CMIF and stability diagram.

Real modes display

This video shows how to display real modes, used to compare experimental and simulation data.

Curve fitting check

This video shows how to compare the measured data to the estimated data by curve fitting.

Auto-MAC validation

This video shows how to check the orthogonality of modal vectors by auto-MAC.

Cross-MAC validation

This video shows how to validate the modes obtained from different methods by cross-MAC.

COMAC analysis

This video shows how to choose the most reliable results with the help of COMAC analysis.

This video shows how to setup data collection for trending, and setup alarm triggering conditions and actions by using M-Logger module.

After receiving alert notification, how to perform initial troubleshooting with trend analysis, and download recorded time signal for advanced diagnostics with OROS Monitoring Solution, M-View module.

How to perform a signal recording in 5 steps.

In this example, the recorder mode is "start to stop": the user starts and stops manually the recording. Other modes are available (Start to time, time to stop).

This video explains the advantages to record signals for further analysis.

Select inputs

How to select the transducers used. In this example, we connect 3 microphones.

Sampling frequency

How to adjust the sampling frequency to 51.2 kHz in order to have a bandwidth of 20 kHz.

Activate the recorder

How to activate the signal recording.

Display signals

This video shows how to display the signals during the acquisition.

Recording

How to start and stop a recording. The recorder mode is "start to stop". Other modes are available (Start to time, time to stop).

How to build a setup for online rotating analysis using the FFT plug-in

and how to post-analyse the recorded signal and perform an order extraction from the time-frequency waterfall.

How the order tracking can help to make a diagnosis on a rotating machine.

Select inputs

Basic steps to guarantee a proper acquisition of signals coming from accelerometer or microphone for instance.

Set a tachometer

The simplest way to set up a tachometer input in NVGate.

Display results

How to display and save the relevant results such as signal time history, overall acoustic level, g’s spectrum, tachometer instant value.

Analysis settings

How to set FFT and OCT module for typical rotating machine analysis during transient shaft speed.

Post-analysis setup

How to analyze recorded signal in post-analysis mode.

Order extraction

How to extract orders from FFT time-frequency waterfall.

Create a Delta RPM event

How to create a delta RPM event to reduce the amount of spectra for a long term machine run-up.

How to do RPM depending display with order cursor. It shows how to generate and post processing tacho signal from FFT spectrogram.

How to build a setup for RT60 measurement using the interrupted source method.

The analyzer output is used to generate a white noise. Thanks to a macro, the whole measurement is automated. It shows how to compute T20 or T30 from the decay curves.

Different indicators (like T20 and T30) can be computed to determine the reverberation time RT60.

Select inputs

How to setup the input table with 2 microphones. In this example the 2 microphone are located inside a meeting room.

Display results

How to display the waterfalls of average 1/n octave spectra on 2 different layouts and how to add them to the saved results selection.

OCT settings

How to adjust the OCT Plug-in settings to compute 1/3 octave spectra with exponential averaging and a time constant of 20 ms.

Waterfall settings

The waterfall will collect a spectrum every 5 ms (depending on the sampling frequency). This video shows how to adjust the waterfall depth to collect 1000 spectra.

Output settings

How to configure the analyzer's output to generate a white noise. The transition time is reduced and the output is muted.

Customize Control Panel

How to create shortcuts in the control panel to easily change some settings if needed.

Assign a macro

How to choose a hotkey (F2) to start the macro "RT60_interrupted_source", which will generate the noise, start and stop the measurement.

Measurement

How the macro is launched using the hotkey. The macro generates the noise, starts the measurement, stops the noise and then stops the measurement.

Export results

How to export the results in .txt format using the "generate one file per result" option.

Import results into Excel

How to import the results for each microphone (position) in the Excel computation file for RT60 with interrupted source.

Axis settings

In the Excel sheet, we identify the time and the amplitude range of interest for the decay curves. The video shows how to adjust all the axis from the Settings tab.

Calculation mode

The calculation mode (T20, T30 or manual) can be changed for all bands or some bands to get the best fit of the regression lines.

Report

The RT60 values for each 1/3 octave band and the calculation mode used (T20/T30/m = manual) are displayed in the Report tab, as shown in the video.

How to design sound via innovative editing and resynthesis of auditory representations.

How to filter sound by a cascade of frequency-based and order-based filters.

It shows how to batch processing multiple signals and how to compare similar sounds by using the distance spectrogram and playback list.

How to build a setup for sound insulation measurement and the obtained results in 6 steps.

The OCT plug-in is used. Operators enable to compute the average inside level (microphones 1 and 2) and the level difference between the inside and outside level.

This video explains the measurement setup for sound insulation measurement.

Select inputs

How to setup 2 microphones to measure the level inside the room and 1 microphone to measure the level outside the room.

Sampling frequency

How to adjust the sampling frequency to 51.2 kHz in order to have a bandwidth of 20 kHz.

Display results

How to display the average 1/n octave spectra and the overall levels for all microphones.

OCT settings

How to adjust the OCT Plug-in settings to compute octave spectra from 16 Hz to 8 kHz with linear averaging on 10 seconds.

Create operators

How to create a quadratic average operator and a dB comparison operator to compute the averaged inside level and the level difference between inside and outside the room.

Measurement and results

Average spectra, overall levels and operators are displayed. In the infotrace, it is possible to display the values for specific octave bands using the cursors as shown in this video.

How to post-analyze data measured by SoundSpot to generate acoustic maps and acoustic videos for source localization?

How to localize noise sources with acoustic maps

how to quantify and rank sources with sound power, and how to predict noise radiation in the far-field, based on the sound pressure measured by an array close to the test object.

You may also read Underwater sound source localization using Near-field Acoustic Holography (NAH) application note.