i Fii-koii, N.L. and Gnwiik, S.G., "Model Flow Studies to 

 Investignip Propel lei^Exci ted Vibrations on U.S. Army Ship 

 1:t col JOHN II. D. PAGE (BDL-IX) Equipped with ' 

 \ertical-Axis Propellers," DTMB Report 1412, March 1960, 



i propeller! 



odel of this ship fitted with twin verti( 

 Circulating Water Channel at DTMB to 

 of blade-frequency vibrations. The ob 

 ex system exists on the propeller that i 



Fontaine, W.R., "Calculated Natural Frequencies, 

 Normal Modes, and Forced Response of Hull and Propulsion 

 Sysiem of CSS SKIPJACK (SSN 585)," DTMB Report 1756, 

 August 1963, 



Natural frequencies, mode shapes, and the forced response of the 

 hull in Its vertical mode and of the hull-propulsion system in its longi- 

 tudinal mode are calculated. 



Fonlaine, H,R., "Calculated Natural Frequencies, 

 Normal Modes, and Longitudinal Responses of MST-12 

 Counter-Rotating Propulsion System and Coupled Hull of 

 I'SS JACK (SSN 605)," DTMB Report 1655, October 1962. 



Normal mode shapes and natural frequencies of vertical flexural 

 vibration of the hull and of longitudinal vibration of the hull-propulsion 

 system were calculated. The forced response and the effect of thrust 

 bearing foundation stiffness are also considered. 



Gariboldi, R.J., "Procedure for Torsional Vibration 

 Analysis of Multimass Systems," Department of the Navy, 

 Bureau of Ships R&D Report 371-V-19, December 1953, 



This report presents a systematic procedure for the analysis of 

 torsional vibration of multimass systems. It includes a detailed numeri- 

 cal analysis of a diesel propulsion system as an example. 



Gold, P.D,, et al., "Vibration Engineering-Resume of 

 Applications to Solutions of Marine Operational Problems 

 Encountered by Naval Vessels," Trans SNAME, Vol, 61, 

 19.-) 3. 



This paper presents a summary of the methods developed and 

 used by Boston Naval Shipyard to resolve vibration and noise problems 

 encountered during the operation of Naval vessels. 



Hardy, V.S. and Jasper, N.H,, "Vibration and Noise 

 Tests of Timken Trunnion Roller Bearings on LSM 297," 

 DTMB Report C-149, December 1948, 



The vibration and noise characteristics of Timken trunnion 

 bearings and of standard sleeve-type bearings were determined during 

 a test of both installed on the LSM 297. The vibration tests showed 

 the present design of the trunnion bearing to be unsatisfactory, and 

 recommendations for redesign of its rubber mounting are made. 

 Differences in airborne noise from the two types are insignificant. 



Harrison, Mark, "Report on Some New Developments in 

 Noise Isolation Problems," DTMB Report 791, April 1953. 



Some recent experimental and theoretical results help to explain 

 the actual behavior of isolation mounts. It has been observed that at 

 sonar frequencies they give much less isolation than elementary theory 

 predicts. Also isolation mounts immersed in water give much less 

 isolation than the same mount in air. 



;thod for evaluating the param« 



?ters 



an electrical mobility analog. 



The 



erties of the vibration reducer 



into 



i detailed in an appendix. 





Harrison, M., Sykes, A.O. and Martin, M„ **Wave Effects 

 in Isolation Mounts,*' DTMB Report 766, October 1952, 



Both theoretical and experimental studies of wave effects in 

 isolation mounts have been made. The well-known "lumped parameter" 

 theory of vibration mounts holds true only when the wavelength of the 

 elastic wave in the mount is large compared to the dimensions of the 

 mount. Standing waves occur, which in certain frequency ranges 

 decrease the vibration isolation properties of the mount by as much as 

 20 db. The theoretical and experimental treatments are in good agree- 

 ment, and indicate various methods for improving the vibration isolation 

 properties of the mount. 



Hayman, D.F* Jr,, "A Method of Evaluating the 

 Hydraulic Vibration Reducer by an Electrical Analog,*' 

 DTMB Report 1616, June 1962. 



This report presen 

 a hydraulic vibration redu 

 conversion of the hydraulic propertie 

 equivalent mechanical sys 



Hord, J<d'H., "Theoretical and Experimental Investi- 

 gation of the Shaft-Restraining Block," DTMB Report 

 497, February 1943, 



This report describes conditions under which excessive longi- 

 tudinal vibrations of shafting and of propelling machinery have been 

 encountered in ships, and outlines the development of a shaft-restrain 

 ing block to inhibit these vibrations. This block is a piston on the lii 

 shaft which moves inside a fixed cylinder. The movement is damped 

 by a partially restricted flow of oil. Several models were tested. 



Jasper, N.H., "A Design Approach to the Problem of 

 Critical Whirling Speeds of Shaft-Disk Systems," DTMB 

 Report 890, December 1954. 



Several methods for computing the natural whirling frequencies 

 of propeller^shaft systems are presented and discussed. Computed 

 and experimentally determined natural frequencies are compared. 



Jasper, N.H. and Rupp, L.A., "An Experimental and 

 Theoretical Investigation of Propeller Shaft Failures," 



Trans SNAME, 1952. 



As a result of the high incidence of tail shaft failures the 



ndations in design procedun 



Jasper, N.H., "A Theoretical and Experimental Study 

 of Propeller-Shaft Failures," DTMB Report 808, August 

 1953. 



This report presents a detailed study of the stresses in the 

 tailshaft of a T2-SE-A2 Tanker of the MISSION type, including an 

 analysis of the causes of tailshaft failures encountered in these ships 

 as well as in Liberty ships and other ships of similar type. EmphasiE 

 is placed on the effects of a whirling type of flexural vibration on the 

 stresses and motions of the shaft. One of the principle conclusions 

 is that the shaft failures are due to a lack of endurance strength of 

 the shaft as designed and built, and not due to a serious lack of 

 endurance strength of the shafting material itself. 



73 



