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.

Measurement task

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.

Overview of the existing functions

	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.

FFT - Order analysis - Acoustics

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

Balancing in two planes

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.