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.
4.Measurement method for damping performance
Loss factor obtained from half width method using imaginary number of frequency response function
Loss factor obtained from half width method using real number of frequency response function
9.Standard for damping performance measurement
10.Damping performance test method
2.The block diagram of the cantilever method
3.The accuracy of loss factor measurement with the cantilever method
1.Characteristics of central exciting method
13.Selection of methods (Cantilever method and Central exciting method)
14.Comparisons of loss factors obtained from various methods
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
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
27.Approximation of loss factor
28.Approximation of Young’s modulus
29.Measurement of loss factor for distortion of damping alloys
Characteristic of Electromagnetic Exciter (Detector) used for Cantilever method