ABSTRACT 



A brief review of the Hull Vibration Program at the David Taylor Model 

 Basin and of the HS-2-1 Task Group of the HS-2 Panel (Dynamic Loadings and 

 Responses) of The Society of Naval Architects and Marine Engineers is given. 

 A bibliography of selected reports and papers on ship and machinery vibration 

 is included. 



Of particular note is the "Code for Shipboard Hull Vibration Measure- 

 ments." This code is intended for use in the evaluation of commercial type 

 ships and has received the approval of the Hull Structure Committee of SNAME. 

 It has been published by The Society of Naval Architects and Marine Engineers 

 as Technical and Research Bulletin No. 2-10. This publication was used as 

 the basis of discussions on the subject of standard vibration measuring sys- 

 tems and procedures for shipboard hull vibration measurements, at the 2nd In- 

 ternational Ship Structures Congress, held at Delft, the Netherlands, July 1964. 



INTRODUCTION 



A review of the work in the field of shipboard vibration in the United States will 

 largely consist of a review of the work of the David Taylor Model Basin and that sponsored 

 by The Society of Naval Architects and Marine Engineers. Although limited studies on hull 

 and machinery vibration have been carried out in other naval facilities and commercial ac- 

 tivities, they generally could be classified as the investigation of specific vibration prob- 

 lems, rather than research and development studies. This report makes no attempt to cover 

 the commercial efforts, which, up to this time, have been largely proprietary in nature. 



Within the David Taylor Model Basin we have five distinct Laboratories: Hydrome- 

 chanics, Aerodynamics, Structural Mechanics, Applied Mathematics, and the recently formed 

 Acoustics and Vibration Laboratory. The study of ship vibration has many facets which in- 

 clude the study of hull response to steady-state (propeller or machinery excited) and transient 

 excitation which includes slamming or impulsive loadings applied by underwater explosion. 

 Various aspects of ship vibration may be found in all five laboratories. However, since this 

 committee is primarily concerned with steady-state vibration, I will briefly review the Hull 

 Vibration Program of the Vibration Division of the Acoustics and Vibration Laboratory (for- 

 merly the Ship Dynamics Division of the Structural Mechanics Laboratory). Additional work 

 of interest to this committee, in the study of propeller-excited hydrodynamic forces, will be 

 covered by Dr. John Breslin. 



