File Size7.92 MB
Tags   Air Force Flight Dynamics Laboratory     Gunfire     Vibrations  
AFFDL-TR-74-123 Low and High Frequency Aircraft Gunfire Vibration; Prediction and Laboratory Simulation.pdfDownload 

Low and High Frequency Aircraft Gunfire Vibration; Prediction and Laboratory Simulation

This report was prepared in the Vehicle Equipment Division (FEE), Air 
Force Flight Dynamics Laboratory, Wright-Patterson Air Force Base, Ohio. 
The report contains the results Of an in-house research program to develop 
a vibration prediction technique and a laboratory test method for aircraft. 
exposed to gunfire environments. 
This work was conducted from 1 October 1972 to 11 December 1974 under 
Task 329A0301 with Robert W. Sevy as project engineer. 
The authors gratefully acknowledge the contribution Of Mark Hal ler , 
Special mention must 
4950th/Digita1 Process ing Branch, Computer Center. 
be made Of the in-house laboratory contributions Of Harold Johnson in the 
fabrication of special equipment and assisstance in the tests. 
this work results from follow-on areas delineated in a previous 
study (Reference 1 ) 
a study which involved the development of a 
prediction rationale for afrcraft vibration induced by the gun blast 
pressure fields of aircraft armaments. The bulk of this past effort 
required the synthesis Of a prediction technique based on energy coupl ing 
between the gunfire blast pulses and the resultant structural response. 
The response spectrum was defined for the high frequency region and was 
expressed fn terms of acceleration power spectral density. In contrast, 
the low frequency region (below 300 Hz) rmained largely undefined. It 
is this subject, its explication and final integration into the high 
frequency random portion of the prediction rationale, that constitutes 
the first objective of this work. The second objective involves the 
develogment of a viable and economic laboratory test method to acconmdate 
the low and high frequency elements. 
In the process Of developing the 
first theƦ a flexible prediction function is sumoned forth and adapted 
to the special conditions and requirements of this technology and so 
beconEs tre medium through which the idea conduces to the achievement. 
Among the results of this work is Revision C to MIL-STD-810, "kthod 
519.2 Gunfire Vibration, Aircraft" which is included as Appendix A.


Have A Comment On This Article? Post It Here.

Comments are moderated and will not be published until approved. Your email address will be kept confidential. Please review our Comment Policy before posting your comment.


Microsoft Excel Spreadsheets

FREE ANALYSIS SPREADSHEETS 3 Over the last 10 years we have developed hundreds of spreadsheet tools to help us with our structural analysis work. We have made these available through the Abbott Aerospace web site and the XL Viking project. We have now brought them into the technical library. They have been updated, improved and the collection has been expanded to cover more analysis methods than ever before.

The XL-Viking Add-In for Excel

XL-Viking 2 We created the XL-Viking Excel add-in to satisfy our own need to make Excel a better engineering tool. XL-Viking shows your Excel Formula in a way that makes sense and brings essential new functionality to Microsoft Excel by providing an additional user interface and easy to use functions.

The Indispensable Tool For Engineers, Mathematicians, Scientists, Accountants and Teaching Professionals!


Technical Papers & Reports

This is our collection of public domain references. All of the material we make available has been placed in the public domain by the authors/owners. If you believe this is not the case and any of the library material is not in the public domain please let us know. If you have any reference material that you would like to see included in the library we would love to hear from you.

Market Analysis and Market Information

Our newest addition to the library is an on-going series of articles on the aircraft and aerospace market. These are part quantitative and part qualitative and introduce a new aspect to the competencies within Abbott Aerospace.