Most specifications that address balancing procedures, ISO2953 comes to mind although I’m not certain, will likely have a section on how to do the sensitivity test. Some API specs as well address the procedure which is usually found as an Appendix to the document.
The choice of wording, “sensitivity of rotor balancing system with rotor” makes me wonder if the OP is referring to the “Residual Unbalance Test” in many API specifications, as Appendix G. In this test, while the rotor is in the balancing machine, a known weight is added at six positions and the results are plotted. I believe the procedure is discussed at length in API RP 684 as well
As per 612, 7th Edition, details are explained and the i have done this exercise many times with rotors.
I am manually drawing the circle, Is any one using excel programmed/spread sheet for this to get the result accurate with circle.
In other OEMS, like Toshiba, japan, after completion of High speed balancing, They will also do Sensitivity check by putting a known mass at known angle and check the response of the weight on the both planes.(only one run per plane).
Based on this data I was asking about sensitivity check in this forum.
I have used Excel for polar plots of balancing, dial indicator and ultrasound data. I found that using the Radar plot with at least 8 data values is visually suitable. John's reference link looks handy for this method. I have found two "tricks" on occasion that helped.
1) Rescale the data, as needed for visual appearance 2) Overlay a circle (I use Bluebeam Revu) to find circle center of data and variation from mean value.
There are sources on Internet for Excel add-on for Polar Plots.
Regarding the OP question, balance sensitivity is determined by the Trial Weight method for field and shop balancing. The sensitivity would be (weight x radius) divided by (vibration level at 1xSS). Some folks use the reciprocal of that value, but either way the relation between balance weight and vibration level can be calculated.
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