FFT analysis - Order analysis - Modal analysis - Acoustic analysis - Level Measurements Vibration and Airborne Sound
Flow chart of the software
1. Task measurement
2. Setup-data acquisition
3. Parameters analysis
4. Graphic settings
5. START-Measurement
6. Save measurement
After selecting a measuring task, the modules are automatically called up one after the other.
The settings must be saved in each module so that these settings are called up the next time the programme is started.
The supported modules are only visible, if they are activated for the customer.
- When they are purchased by the customer.
A measurement task is selected here.
FRF – Transfer functions | |
---|---|
Signal | Triggered Signalblock with 1024, 2048, 4096, 8192, 16384,32768,65536 Samples |
FFT-Spectrum | FFT-Spectrum of Signal-Block |
FFT T-AVG | Averaged FFT-Spectrum |
FRF-Ref Mag + Phase | Transfer function Magnitude + Phase for 1 to 4 References |
Coherence | Coherence Function |
INV FRF-Ref Mag | Inverse Transfer function Magnitude for 1 to 4 References |
FRF-Ref Real-part / Imag-part | Transfer function Real-Part and Imaginary-Part for 1 to 4 References |
FRF-Ref Nyquist | Transfer function Nyquist for 1 to 4 References |
Magnitude A / Magnitude B | Spectrum Channel A / Spectrum Channel B |
Spectral investigations can be carried out in this module.
This module is suitable for the measurement of transfer functions which can then be evaluated in a modal analysis system.
The transfer functions [m/s²/N] as compliance function and the inverse FRF function [N /m] as stiffness can be displayed simultaneously.
The following tasks can be analyzed in this module:
- FFT-Analysis
- Order analysis
- Acoustic Analysis
- Level measurements of structure-borne sound
- Level measurements of air-borne sound
Functions | |
---|---|
Signal | Triggered Signalblock with 1024, 2048, 4096, 8192, 16384,32768,65536 Samples |
FFT-Spectrum | FFT-Spectrum of Signal-Block |
Speed | Speed vs time collected by the counter |
Order-Spectrum | Order-Spectrum |
Order-Amplitude vs. Speed + Time | Phase of a selected Order vs. Speed + Order vs. Time |
Order-Phase vs. Speed + Time | Phase of a selected Order vs. Speed + vs. Time |
Order-Polar | Polar Graph Magnitude/Phase of selected Orders |
Signal-Ringbuffer | Collected Signal of the Ringbuffer |
Angular Resampling Signal | Resampling Signal vs Rotating angle |
1X Amplitude vs. Speed | 1. Order Amplitude vs. Speed |
1X Amplitude vs. Time | 1. Order Amplitude vs. Time |
1X Phase vs. Speed | 1. Order Phase vs. Speed |
1X Phase vs. Time | 1. Order Phase vs. Time |
Time domain Level acc. | Level m/s² vs. Time 125 ms 30 ms 1 s weighted |
Time domain Level vel. | Level mm/s vs. Time 125 ms 30 ms 1 s weighted
Time domain |
Time domain Level disp. | Level μm vs. Time 125 ms 30 ms 1 s weighted |
Time domain Speed | Speed vs. Time |
Time domain 1X-Ampl. acc. | 1. Order m/s² Acceleration Level vs. Time |
Time domain 1X-Phase acc.. | 1. Order m/s² Phase vs. Time |
Time domain 1X-Ampl. vel. | 1. Order mm/s Velocity Level vs. Time |
Time domain 1X-Phase vel. | 1. Order mm/s Phase vs. Time |
Time domain 1X-Ampl. disp. | 1. Order μm Displacement Level vs. Time |
Time domain 1X-Phase disp. | 1. Order μm Phase vs. Time |
Time domain RMS | Root mean square vs. Time |
Time domain Mean-value | Mean-value vs. Time |
Time domain Peak-Peak | Peak-Peak vs. Time |
FFT-Avg. | FFT-Spectrum averaged |
Time domain Sound Level | Sound Level Linear vs. Time dB |
Time domain Sound Level A-Filter | Sound Level A-Weighted vs. Time dB A |
Time domain Sound Level C-Filter | Sound Level C-Weighted vs. Time dB C |
Time domain Sound Power dB | Sound-Power vs. Time dB |
Time domain Sound Power dB A | Sound-Power vs. Time dB A |
Time domain Sound Power dBC | Sound-Power vs. Time dB C |
Sound Power FFT | FFT-Spectrum as Sound Power |
Sound Power dB vs. Speed | Sound Power dB vs. Speed |
Sound Power dBA vs. Speed | Sound Power dBA vs. Speed |
Sound pressure dB vs. Speed | Sound Pressure dB vs. Speed |
Sound pressure dBA vs. Speed | Sound Pressure dB A vs. Speed |
Sound Power dB vs. time | Sound Power dB vs. time |
Sound Power dBA vs. time | Sound Power dBA vs. time |
Sound pressure dB vs. time | Sound pressure dB vs. time |
Sound pressure dBA vs. time | Sound pressure dBA vs. time |
1/3 Octave-Spectrum | 1/3 Octave-Spectrum Lin / A / C Filter |
1/3 Octave-Sound Power | 1/3 Octave-Spectrum Sound-Power Lin / A / C Filter |
AVG. Sound pressure dB vs. Speed | Sound Level (Average of all Microphones) dB vs. Speed |
AVG. Sound pressure dBA vs. Speed | Sound Level (Average of all Microphones) dB A vs. Speed |
The following tasks can be analysed in this module:
- FFT-analysis
- Order analysis
- Unbalance calculation
Functions | |
---|---|
Signal | Triggered Signalblock with 1024, 2048, 4096, 8192, 16384,32768,65536 Samples |
FFT-Spectrum | FFT-Spectrum of Signal-Block |
Speed | Speed vs time collected by the counter |
Order-Spectrum | Order-Spectrum |
Order-Amplitude vs. Speed + Time | Phase of a selected Order vs. Speed + Order vs. Time |
Order-Phase vs. Speed + Time | Phase of a selected Order vs. Speed + vs. Time |
Order-Polar | Polar Graph Magnitude/Phase of selected Orders |
Signal-Ringbuffer | Collected Signal of the Ringbuffer |
Angular Resampling Signal | Resampling Signal vs Rotating angle |
1X Amplitude vs. RPM | 1. Order Amplitude vs. RPM |
1X Amplitude vs. Time | 1. Order Amplitude vs. Time |
1X Phase vs. RPM | 1. Order Phase vs. RPM |
1X Phase vs. Time | 1. Order Phase vs. Time |
Modul FFT / Order analysis / Acoustic
After selecting the measurement task, the Data Acquisition window is displayed.
The settings for each measuring channel must be made here. For the speed, 3 signal types can be selected Pulse or periodic signal, Analogue (mV/RPM) or Frequency (mV/Hz). The Execute command accepts the settings and parameterises the hardware. The settings can be managed with Save and Load..
Filter
Filters can be switched on here during data collection. The raw data are therefore filtered.
FFT Analysis Setup
FFT-Analysis Block Size and Resolution
FFT waterfall is controlled by a counter.
- Order analysis
Order resolution and number of orders
Order waterfall with the counter - Speed control
Run up / run down - Level measurements Structure-borne sound
Total level Acceleration
Speed Displacement - Level measurements Air-borne sound
A-weighting C-weighting Linear - Sound power
Microphone selection
For sound power, the measurement can be stopped automatically for the stationary case automatisch gestoppt werden.
The data is only active when Execute is displayed.
Example - Sound power with 10 microphones
In the table, the microphone channels must be activated with X. The following quantities must still be taken into account:
The surface, K1 ambient noise and K2 room correction are defined in dB.
With the activation Sound Power Waterfall the measuring points are recorded as a waterfall over speed or time.
For the stationary case there is the option to end the measurement automatically End measurement after.
After running, a new window appears for the channel assignment of the measurement tasks.
The memory space is limited and herewith each channel can take over a task.
Without this selection, no level calculation can be carried out.
Graphics setting
The fonts and colours are defined here.
The zero-degree position can also be defined for the polar display.
Spectrogram
After leaving the scaling and pressing Create, the sonogram appears
Set main graphic
Here, individual diagrams can be displayed one after the other with DISP> and <DISP
Example setup for sound power
Example measurement : Sound power
The following settings are necessary in the analysis setup. If the speed channel is not available, RPM OFF must be set
Fast Slow or Impulse evaluations can be selected for the level calculation.
Pressing the Start button starts the measurement.
Calibration of the sensors
With the button Calibration the software changes to the calibration module.
Sensor calibration menu
After calibration, the constants are taken over directly for the next measurement.
Structure-borne sound sensors
and microphones can be calibrated.
Number of averages
After selecting a calibration type, the measurement starts with START.
Measurements Loading and Saving
Load Recording
The following data formats are supported:
- TAFFmat = TEAC proprietary file format
- MDF-Format
- DAT-Format (The data format of the software)
- MP3-Format (Audio)
- WAV-Format (Audio)
After the selection, the time course of the recording file is shown in the first diagram.
Load: Load new recording file
Setup: Table content of the recording file
Switch on cursor: The analysis area in the time course can be defined with this..
Analysis: Setting of the analysis.
With Start, the analysis begins as with online measurement.
Switch on the cursor: Start click and mark the position in the diagram with the mouse
Exit-Click is for the end position.
Start-Analysis