Example of rotation-tracking diagram of engine vibration

 

This software enables tracking analysis with high-speed (calculation speed: approx. at 20ms/4-ch), high-resolution (1000 blocks max.) and high-accuracy (more than 100dB dynamic range). It can plot rotation-tracking diagram during calculation, and also can set and plot the diagram of intended order or frequency after the calculation. *DS-0321 series FFT analysis software is required.

 


Campbell plot

 

3D array display

 


Color map

 

Measurement setting window

 


What is Tracking analysis

Rotating machines such as engines or compressors etc. are rotating with wide range of rotation speed from low to high speed. For those rotating machines, resonance between rotation speed and natural frequency of each component (rotation shaft, gear, bracket etc.) of rotating machine may be causing serious problem. As an example of torsional vibration including large generator, resonance may generate excitation energy lager than allowable stress, and therefore it causes serious accident to destruction. Rotation-tracking analysis helps greatly to observe the cause such as which component or order of rotation speed makes noise and vibration when a rotating machine makes vibration with certain rotation speed. As shown in the below, rotation-spectrum diagram (3D spectrum) figures out the change of frequency (order) spectrum respect to the change of rotation speed. In comparison, rotation-tracking analysis (order tracking analysis) shows that how much noise and vibration are generated from which order of rotation component with two-dimensional graph.

*Rotational order is defined that a based rotational speed is 1-order, n-times rotational component is n-order. Data analysis with order on the X axis and amplitude on the Y axis is called rotational order ratio analysis. Rotational order ratio analysis requires rotational signal information.

Applications for Tracking Analysis

(1) Noise and vibration analysis for an automobile engine
(2) Noise analysis for a turbo charger
(3) Measurement of transmittance error for a transmission
(4) Torsional vibration analysis for a deferential gear
(5) Vibration analysis for a turbine blade
(6) Noise analysis for motor cycle

Specification

Number of input pulses

0.5 to 1024 pulses/1 rotation

Input impedance

100 kΩ

Input coupling DC or AC(0.5 Hz/-3 dB)
Voltage fullscale: TTL or ±10 V
Slice level ±100 % within voltage fullscale
Minimum input level: ±0.5 V
Slope +/− selectable

Analysis section

Tracking analysis

Memory tracking (real-time plotting is possible)
Number of memory blocks: 200 to 1000

Maximum analysis orders

6.25 to 800 orders

Number of sampling points Initial setting value 2048 (maximum at 16384)
Order resolution: Initial setting 800 lines(maximum at 6400 lines)
Range of rotational speed under measurement (at 1P/R)

 

Maximum analysis order Measurable rotation speed (r/min) Number of sampling points / rotation
6.25 120 to 192,000 16
12.5  90 to 96,000 32
25  70 to 48,000 64
50 70 to 24,000 128
100 70 to 12,000 256
200 60 to 6,000 512
400 60 to 3,000 1024
800 60 to 1,500 2048

 

Display function Time-axis waveform, Frequency analysis (amplitude, phase),
Order-ratio analysis (amplitude, phase), Constant-ratio tracking analysis (amplitude, phase), Constant-width tracking analysis (amplitude, phase), Fixed frequency tracking analysis (amplitude, phase), Time tracking analysis (amplitude, phase), 3D mapping , Campbell plot
Processing function Exponential averaging, Maximum amplitude order tracking, Partial overall tracking, Smoothing processing (2 types), Averaging function of tracking analysis data

Data input/output function

Data file

Open/Save at binary or text (.txt) format

Tracking data

Open/Save at binary format, save only at text (.txt) format

Analysis condition file Open/Save of arbitrary measurement condition file
Copy function of data Data paste on clipboard at text or bitmap format.

Operating environment

OS

Windows® XP (SP2 or later), Windows Vista® (SP2 or later), Windows® 7

*32bit version only

NET Framework

.NET Framework 3.5 or later

*Windows®, Windows Vista® are registered trademarks of Microsoft Corporation in the United States and other countries. Other product names and model names are trademarks or registered trademarks of each individual company. The copy rights are reserved by each individual company.

 Revised:2014/05/07



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