Accession Number:
AD0639912
Title:
DETERMINATION OF FIXED BASE NATURAL FREQUENCIES OF DUAL FOUNDATION SHIPBOARD EQUIPMENTS BY SHAKE TESTS,
Descriptive Note:
Corporate Author:
NAVAL RESEARCH LAB WASHINGTON D C
Personal Author(s):
Report Date:
1966-08-23
Pagination or Media Count:
17.0
Abstract:
The report investigates the application of resonance testing to determine the fixed base natural frequencies of an in-place shipboard equipment-foundation system which is supported at two base points. Translation of the base points can cause the structure to rotate as it translates. A method was previously proposed which required the simultaneous use of two shakers capable of phase control and a range of force ratios at each driving frequency this method would be quite difficult and expensive to apply in the field. A new technique is proposed herein which requires only one shaker to be applied at a time, thereby reducing the difficulties and restrictions considerably. An application of the technique to a theoretical system, and an analog simulation of a shake test utilizing the new method are presented. Author
Descriptors:
Subject Categories:
- Marine Engineering
- Mechanics