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Dynamic Signal Analysis

Solutions for Dynamic Signal Analysis applications




Dynamic Signal Analysis

Applications



Noise & Vibration Go to applications page


  • Recorder
  • FFT analyser
  • Global level
  • Octave Band Analysis
  • Time Domain Analysis
  • Multi-domain analysis
  • Filters

Rotating machinery Go to applications page


  • Order tracking
  • Orbit graph
  • Campbell plot
  • Torsional vibration
  • Multi-domain
  • Cepstrum
  • Auto & Cross correlation
  • Bearing fault
  • Balancing

Structural Analysis Go to applications page


  • Modal Analysis
  • Impact test
  • Function generator
  • Large structures, High channel count
  • Operating deflector shapes
  • Shock & Drop tests
  • Bump test
  • Short-time FFT

Acoustic Analysis Go to applications page


  • Sound level
  • Sound power
  • Pass-by noise

Software


The Dewesoft X software can acquire signals simultaneously from different sources (even with different sampling rates). It includes rich post-processing features with all the powerful mathematics and analysis functions for various application needs.


The DEWESoft concept - Multifunctional instrument for every application

The DEWESoft amplifiers on the analogue front-end build the solid base to convert any physical input (strain, acceleration, force, temperature, current, ...) into accurate digital signals for the software.

All other signals such as digital, counter, CAN bus, video data, serial interface... are acquired fully synchronised. DEWESoft always stores the raw signals!

The channels arrive on the digital »backbone«, where they can be used for further mathematical calculations (filtering, statistics) and in modules such as Torsional Vibration, Order tracking, Sound Level... The math results can be used as input for other modules and vice versa! Calculations in realtime, as well as on stored data.

The results can then be linked to powerful, configurable instruments (like Digital meter, Analogue meter, Recorder, Scope, FFT, XY graph, Orbit plot, 3D graph...) with lots of properties.

Very often the math modules provide specialised instruments, which results in a turn-key solution for a range of applications.


Main DEWESoft X advantages


  • Intuitive user interface.
  • Quick reload of data files. Our patented file storage allows data files to be opened in a blink, even though if data stored is several giga bytes large.
  • Easy export to a lot of formats: Matlab, FlexPro, Diadem, Excel, CSV, and much more.
  • No additional SW license needed to view and analyse data. This way you can distribute your data to unlimited view clients without need to purchase additional SW licenses.
  • Free updates forever (no annual license costs)
  • Powerful Signal Processing (Math) -> correlation, cepstrum, array math, filters, and much more provides less need for additional post-processing software.
  • Filtering (FIR, IIR, FFT filter, integration, derivation, ...).
  • Math calculations are also possible on stored data offline-math.
  • TEDS support (intelligent sensors, read and write to TEDS cheap).
  • Custom user input (data header).

To learn more about DEWESoft X software please visit Dewesoft X product page.

Hardware


We offer complete line of powerful, rugged and very flexible DAQ instruments for any automotive-based application. Either modular and distributed design with external computer or all-in-one design with built-in display and industrial-proof rugged computer. For testing in extreme environments we also offer fully sealed, water, dust and shock proof line of IP67 rated instruments.




See all DEWESoft DAQ instruments




Main Hardware Features


High dynamic

This new technology solves the often faced problem that the signal is higher then expected and therefore clipped. DEWESoft® DUAL CORE ADC technology always gives you the full possible measuring range, because the signal is measured with a hight and low gain at the same time!

Customisable front-end

Select your amplifier configuration. From the image example above:
  • 3x High-Voltage input 1200 V
  • 1x IEPE/Voltage + Encoder/Tacho
  • 2x IEPE/Voltage
  • 2x Multi (Strain gage/Voltage, sensor excitation, Tacho, Analog out)

IEPE sensor check

The LED ring around the connector will light green or red, depending if sensor impedance is ok.





Fully Isolated

The worry free solution provides isolation on the sensor side (channel to GND, as well as, channel-to-channel) and even isolated sensor excitation! Less noise, no ground loops, best signal quality.

Super-counters

To achieve highest accuracy, DEWESoft uses a special technology to determine the count and exact time of the input edge on a 102 MHz timebase. This allows the usage even for most demanding applications such as torsional vibration.


See all DEWESoft DAQ instruments




DEWESoft® DSA sensors


Vibration sensors

I1A-50G-1 I3A-50g-1 I1TI-50g-1 C1T-5000g-1 I3T-500g-1 I3T-50g-1 IH-500N-1

I1A-50G-1

I3A-50G-1

I1TI-50G-1

C1T-5000G-1

I3T-500G-1

I3T-50G-1

IH-500N-1

Number of axis single triaxial single single triaxial triaxial single
Sensitivity 100 mV/g 100 mV/g 100 mV/g 50 pC/g 10 mV/g 100 mV/g 50 mV/lbf (=11,24 mV/N)
Range 50g 50g 50g 5000g 500g 50g 100 lbf (=444,82 N)
Type IEPE IEPE IEPE IEPE IEPE IEPE IEPE
Frequency range +/- 5 %: 0.3 to 5000 Hz +/- 10 %: 2 to 5000 Hz +/- 10 %: 0.3 to 10 000 Hz +/- 8 %: up to 5000 Hz Axis 1 & 2: 1.5 to 5,000 Hz (+15/-5%)
Axis 3: 1.5 to 10,000 Hz (+15/-5%)
+15/-10%: 0.3 to 10,000 Hz 75 kHz resonance frequency
TEDS
Features miniature size case isolated, triaxial case isolated, industrial high temperature lightweight; triaxial low noise; triaxial modal hammer with TEDS
Dimensions 10,2 x 10,2 x 10,4 mm 15,5 x 15 x 15 mm 17,5 x 42,2 mm 12,7 x 24,4 mm 12,4 x 9,1 x 9,1 mm 21 x 12 x 11 mm 221 x 71 mm
Weight 4,3 g 10 g 44 g 25 g 4 g 5,6 g 100 g (head)
Temperature range -51...+82 °C -51...+82 °C -51...+121 °C -51...191 °C (up to 260 °C on request) -51...+121 °C (up to 160°C on request) -51...+82 °C -40...65 °C




Tacho sensors and Tacho level converter



DS-TACHO2

DS-TACHO2

  • Optical tacho probe with LED
  • Stainless steel with 2.5m cable
  • Up to 4kHz frequency
  • Distance to object up to 1m
  • Power supply 3-15VDC, 45mA
  • Visible red pointer, Control LED
  • Operating temperature -10°C to +70°C
  • Dimensions 73mm length, 16mm diameter
  • L1B7m connector for DEWE-43, MINITAURs and SIRIUS counter input
  • Incl. 30 cm reflector band

DS-TACHO1

DS-TACHO1

  • Converts analog tacho signal to TTL
  • Fits to COUNTER input (Lemo 7pin) on DEWE-43, MINITAURs and SIRIUS
  • ±100V input isolated, trigger threshold adjustable ±10mV ... ±2V


DS-TACHO3

DS-TACHO3

  • Optical tacho probe with LASER (red class2)
  • Stainless steel with 2.5m cable
  • Up to 4kHz frequency
  • Distance to object up to 7.5m
  • Power supply 3-15VDC, 0,13W
  • Visible red pointer, Control LED
  • Operating temperature -10°C to +70°C
  • Dimensions 73mm length, 16mm diameter
  • L1B7m connector for DEWE-43, MINITAURs and SIRIUS counter input
  • Incl. 30 cm reflector band

DS-TACHO4

DS-TACHO4

  • Optical tacho probe with LASER (red class2)
  • 5m optical fiber and trigger box included
  • Up to 100kHz frequency
  • Distance to object 2-5mm
  • Power supply 3-30VDC, 120mA
  • Operating temperature -10°C to +70°C
  • Dimensions M6 x 20mm2.5m cable with
  • L1B7m connector for DEWE-43, MINITAURs and SIRIUS counter input
  • Incl. 1 m reflector band with 2mm black/white grid

Online Training


DEWESoft PRO training is a NEW learning platform, made for measurement professionals and those who would like to become one. It is easy to use, available at any time and completely FREE. Your effort in each course is also rewarded. Curious? Visit DEWESoft PRO training and take a look.


Special dynamic signal analysis related courses


Vibration measurement

Vibration can be considered to be the oscillation or repetitive motion of an object around an equilibrium position. Vibrations usually occur because of the dynamic effects of manufacturing tolerances, clearances, rolling and rubbing contact between machine parts and out-of-balance forces in rotating and reciprocating members.

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Sound pressure measurement

Sound pressure or acoustic pressure is the local pressure deviation from the ambient atmospheric pressure, caused by a sound wave. In air, sound pressure can be measured using a microphone, and in water with a hydrophone.

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Spectral analysis using the FFT

Frequency analysis is just another way of looking at the same data. Instead of observing the data in the time domain, frequency analysis decomposes time data in the series of sinus waves. Fast Fourier transform is a mathematical method for transforming a function of time into a function of frequency.

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Modal testing (FRF)

Modal test and analysis are used to determine the engineering structures modal parameters, such as modal frequencies, damping ratios, and mode shapes. The measured excitation and response (or only response) data are utilized in modal analysis, and then dynamic signal analysis and modal parameters identification are processed.

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Order tracking

Order tracking method is used to extract the harmonic components related to the rotational frequency of the machine. Order tracking is used is the analysis of vibration signals from rotating machines. There we use order spectrum instead of the frequency spectrum. An order spectrum gives the amplitude and the phase of the signal as a function of the harmonic order of the rotation frequency.

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Human vibration

Human vibration is defined as the effect of mechanical vibration of the environment on the human body. During our normal daily life, we are exposed to various sources of vibration, for example, in buses, trains, cars. Many people are also exposed to other vibrations during their working day. Those vibrations have to be monitored and are defined by standards.

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Rotational and torsional vibration

Torsional vibrations are important whenever power needs to be transmitted using a rotating shaft or couplings, such as in the case of automotive, truck and bus drivelines, recreation vehicles, marine drivelines or power-generation turbines. Torsional vibrations are angular vibrations of an object and rotational vibration is simply the dynamic component of the rotational speed.

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Balancing

Balanced rotors are essential for most kinds of rotating machinery. Unbalance will create high vibrations, reducing fatigue life, causing material defects. In most cases the rotor unbalance is the major problem of vibration, it is related to the rotational frequency. The goal of balancing is to minimize vibrations related to the first order.

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Fatigue analysis

Fatigue is the progressive and localized structural damage that occurs when a material is subjected to cyclic loading. Continued cycling of high-stress concentrations may eventually cause a crack which propagates and results in leakages. This failure mechanism is called fatigue.

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