All Software Features

Advanced Analysis

Employ an advanced analysis of one or multiple waveforms with features such as resampling, filtering, advanced data analysis (PSD, transfer function, etc.), and Multimedia Sync. You can obtain a free trial of an Advanced License by selecting Request Trial in ObserVIEW.

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Frequency Domain Analysis

Analyzer traces are tools to analyze time waveform data in the frequency domain. ObserVIEW includes the following traces:

  • Fast Fourier Transform (FFT): Transforms time-domain data into the frequency domain.
  • Power Spectral Density (PSD): Displays the power in a frequency band.
  • Transfer Function: Signifies a resonance or antiresonance in a system.
  • Coherence: Indicates how closely a pair of signals (x and y) are statistically related.
  • Cross Spectral Density: Displays the power in a frequency band for a pair of signals that have been multiplied in the frequency domain.
  • Transmissibility: Like transfer function estimates, signifies a resonance or antiresonance in a system.

Additional Traces

tachometer-based spectrogram

  • Spectrogram: Displays the amplitude of multiple FFTs. What is a spectrogram?
  • Nyquist: View transfer function data as a scatter plot. Used to assess the stability of a system with feedback during modal analysis.

FFT & PSD Analysis

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Understanding Waveform Relationships

Free VRU Courseimage link to understanding waveform relationships VRU course

Fast Fourier transform (FFT) and power spectral density (PSD) mathematics are powerful tools for analyzing the characteristics of a waveform. There are also several types of mathematics to explain the relationships between two or more waveforms.

Three commonly used functions are presented in the “Mathematics for Understanding Waveform Relationships” VRU course: transfer function, correlation, and cross-spectral density.

Take the Course

Multi-media Sync

Analyze and playback media in sync with the recording for a more robust view of events.

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Multimedia Sync opens a video file(s) and syncs it with the time of the recording. Then, view the video and data playback at the same and extract images/data for a report. You can also add other media files such as additional video files and audio files after the player is open.

Multimedia Sync is a feature of Advanced Analysis.

Learn More

Resampling

Resample changes the sample rate to user specifications on a time waveform. It changes the sample rate to the target sample rate.

Use Cases

  • Comparing two data files with different sample rates.
  • Downsampling data for quicker, more convenient handling if there is no high-frequency data.
  • Increasing the smallest sample rate of the input files to increase the frequency resolution of an analysis algorithm like the fatigue damage spectrum (FDS).

Filtering

Filtering removes frequency components from a time waveform. Filters can filter out, accept, or boost frequency components.

Use Cases

  • Filtering out a DC offset
  • Filtering out a frequency band contaminated by noise
  • Removing frequencies outside a shaker’s specifications during file playback.
  • Filtering to the transducer’s specifications after recording to help remove data outside its rated operation.
  • Attenuating rapidly changing frequency components to smooth a noisy data sequence.

Filter Options

  • High-pass Filter: Remove low-frequency components below the corner frequency and allow the high-frequency components above the corner frequency to pass through.
  • Low-pass Filter: Remove high-frequency components above the corner frequency and allow the low-frequency components below the corner frequency to pass through.
  • Bandpass Filter: Accept a middle-frequency band and reject everything above and below.

General Purpose FIR Filters

If your tests require the following, then you may need an FIR filter:

  • Notch out one or multiple single-frequency components
  • Filter out one or multiple bands of frequency components
  • Add dips and bumps in the filter response to equalize
  • A linear-phase filter

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