Applies To Product(s): AutoPIPE Version(s): 2004, XM, V8i Environment: N/A Area: Warning Subarea: Original Author: Bentley Technical Support Group Date Logged & Current Version Feb. 2015 09.06.01.10 Problem: The following occurs when running a modal analysis: --------------------------- Warning --------------------------- W801-14: No frequency below cutoff value --------------------------- OK --------------------------- Why does this occur and how to avoid it? Answer: Essentially the message indicated on the warning is correct, there are no frequency that can be calculated for the piping system model based on the modal settings. How to get around it? On the Modal Tab of the Dynamic Analysis dialog, enable the "Analyze up to Cutoff" option and increase the "Cut-off Frequency (Hz):" setting. Now analyze the system, if this warning message appears again, increase the "Cut-off Frequency (Hz):" to a higher value. this may be a repetitive approach, until such time the modal analysis runs without the warning appearing. Typically this message appears for models that have a unusually high 1st mode of vibration sometimes attributed to piping systems that are very stiff or have very little flexibility. See Also Bentley AutoPIPE External Links Bentley Technical Support KnowledgeBase Bentley LEARN Server Comments or Corrections? Bentley's Technical Support Group requests that you please submit any comments you have on this Wiki article to the "Comments" area below. THANK YOU!
↧