Technical Report

Damping materials and their performance measurement

There are terms, “damping” and “damping materials” in vibration measurement and analysis area.  Damping is to control the sharpness of vibration to convert vibration energy into thermal energy; it is totally different approach from “vibration isolation” which is major method and controlled by change of rigidity, vibration isolation to reduce vibration. Damping seeks to reduce vibration as much as possible and to create more comfortable environment.  We focus on “damping” in terms of meaning and differences, explain how to measure damping materials and pick up some important points for measurement.  We recommend especially those who engage damping, vibration isolation to read through this report.

1.Damping

2.Damping materials

3.Loss factor

4.Measurement method for damping performance

5.Half value method

6.Decay ratio method

7.Impedance method

8.Non-resonance method

9.Standard for damping performance measurement

10.Damping performance test method

11.Cantilever method

12.Central exciting method

13.Selection of methods (Cantilever method and Central exciting method)

14.Comparisons of loss factors obtained from various methods

15.Mass cancellation

16.Necessity of FFT zooming analysis

17.Zoom analysis and Mass cancelation

18.Curve fitting by use of pole-zero models for the loss-factor measurement

19.Two points hanging method

20.Loss factor depends on the vibration mode

21.To obtain an accurate frequency response function

22.Window function for the measurement of loss factor

23.How to calculate Young's modulus

24.Physical property of viscoelasticity materials

25.Reduced frequency nomogram

26.Inverted-“U” plot

27.Approximation of loss factor

28.Approximation of Young’s modulus

29.Measurement of loss factor for distortion of damping alloys 

30.References

31.Supplements

     Characteristic of Electromagnetic Exciter (Detector) used for Cantilever method

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