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Computer Aided Balancing System

Overview

This system analyzes the shaft vibration of various rotating machines such as generator turbines. It also calculates the balance of the shaft.
Based on a phase reference signal and the vibration waveform signal measured with a shaft vibration detection sensor, modal circles (Nyquist plots), V-S graphs (vibration vs. rotation speed graphs), and other graphs can be displayed in real time, allowing you to confirm that the rotating machine is working properly.
In addition, by using the modal circles mentioned above, you can also calculate the optimum mass and location of a balance weight to offset the unbalanced component (location of the balance hole).

Monitoring screen

Monitoring screen

Examples of functions

Data analysis

  • Phase analysis
    Vibration vectors are calculated based on a phase reference signal and the vibration waveform signal.
    A modal circle is a plot of vibration vectors when the machine's speed of rotation increases or decreases.
  • Frequency analysis
    The vibration spectrum is calculated by performing FFT analysis of the vibration waveform signal.
  • Trajectory of the center of the shaft
    The center position of the shaft can be calculated from the gap voltage of the vibration waveform signal.
  • Lissajous curve
    The movement of the center position of the shaft when the shaft rotates once can be calculated.
Data analysis

Balance calculation

The vibration vectors and the effect vector (the vector that indicates the effect of installing a balance weight) are measured at a maximum of 16 evenly distributed rotation speeds. Vibration values at six of those measurement points are selected and, based on them, the optimum mass and installation location for a balance weight can be calculated to minimize vibration.

System Configuration

System Configuration
  • A pulse signal and the shaft vibration signal are measured by a sensor installed on the rotating machine, and are fed into the Computer Aided Balancing System.
  • Based on the measured data, the system performs processes analysis including processes such as phase analysis and frequency analysis.
  • The analysis results are displayed on a monitor.
  • The analysis results are saved to an HDD.

Related Products

The information on this page has been authorized by MITSUBISHI HITACHI POWER SYSTEMS, LTD. For further information, please click the link below.

http://www.mhps.com/en/products/category/diasys.html

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