(irconspon, J,E., "Sen Tost^ of Iho USCGC UNIMAK, 

 Piirl .i-Prcssurps, Strains, and Dofleclions of the Bottom 

 Plaling Inridonl lo SlaniminK," DTMB Report 978, March 



This report present 

 >iurmft rouRh-water sea tri, 

 July. The dala includes 11 

 well as the corresponding 

 plating. These measurem. 



5 of a Coast- Guanl . 

 impact pressures ii 

 ;rains and deflectioi 



Df the test data taken 

 itter on weather patrol 

 :ident to slamming as 

 ; of the forward bottom 

 results obtained from 



(ireenspon, J,E. and Wigle, B.M., "Probability Distri- 

 l>uiion of \\a\ e-Induced Hull Girder Stresses for a Destroyer 

 Escort, Based on Sea Tests of USS FRESSENDEN (DER- 

 Ul')." DTMB Report 1020, April 1956. 



.es hull stress distributi- 

 off the North Atlantic co: 





Harrison, M., eUal., "Wave Effects in Isolation Mounts," DTMB 

 Report 766, January 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 

 agreement, and indicate various methods for improving the vibration isolation 

 properties of the mount. 



Hayes, Wallace D., "Effective Mass of a Deformablo Circular 

 Cylinder," Graduate Division of Applied Mathm,atics, Brown Univer- 

 sity, ONR Contract N7onr-35810, Tech Report 1, August 1951. 



The concept of the effective mass tensor is extended to apply lo the problem 

 of hydrodynamic forces acting on a deformable body. The concept is illustrated 

 by an example. 



Greenwood, D.T., ".Analog Methods of Non-Linear 

 Vibration .Analysis," Thesis, California Institute of 

 Technology, 1951. 



Hardy, \',S., "Vibration Measurements Made on the 

 ISS PHILIPPINE SEA (CV 47) during Standardization 

 Trials of 5 June to 1 July 1947," DTMB Report C-6, 

 August 1947. (Declassified.) 



The purpose of these vibrati' 



; to de 



of four-bladed CLYBEN and NACABS propellers on 

 e vessel. Vibration amplitudes were small with both 

 i but NACABS gave slightly less vibration below 240 



ipa 



Hardy, \',S., "\ibration Studies of Ship Hulls by Means 

 of \ ihration Generators," DTMB Report C-80, 1949. 

 (Declassified,) 



This report gives a summary of the vibration-generator tests 

 conducted by DTMB prior to 1949. The experimental natural frequencies 

 are compared with corresponding frequencies computed by using Schlick' 

 and Burrell's impirical formulas. 



Hardy, \irgil S, and Jasper, Norman 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 Timke.i 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 unsaUsfactory, and 

 recommendations for redesign of its rubber mounting are made. Differ- 

 ences in airl>ome noise from the two types are insignificant. 



Hayman, D;F., "A Method of Evaluating the Hydraulic 

 \ ihralion Reducer by an Electrical Analog," DTMB Report 

 UnO, June 1962, 



This report presents a method for evaluating the parameters of a 

 hydraulic vibration reducer by an electrical mobility analog. The con- 

 version of the hydraulic properties of the vibration reducer into an 

 equivalent mechanical system is detailed in an appendix. 



Heller, S.R., "Natural Frequencies of Shaft Struts," DTMB 

 Report 1219, April 1958. 



Shaft strut vibration tests were made on several ( 

 apparent inconsistencies in the results indicated the desirability of developing 

 an analytic solution for the problem which might explain the inconsistencies. 

 This paper presents an analytic solution. 



Heller, S.R., Jr., "Wave Geometry for Longitudinal Strength," 

 Transactions of American Society of Naval Engineers, 1954. 



This paper has the following threefold purpose: 



I. Portray the historical development of standard longitudinal strength 



2. Show the i 



3. Suggest m 



stencies in these calculation: 

 > remedy the inconsistancies. 



Heller, S.R., Jr. and Abramson, H.N., "Hydroelasticity: .A New 

 Naval Science," Journal ASNE, May 1959. 



Many of the various subjects which comprise aeroelasticity have the 

 counterparts in the field of naval architecture. In an effort to provide a frame- 

 work for hydroelasticity. these counterparts are defined and discussed. 



Herrmann, G., "Forced Motions of Timoshenko Beams," 

 Contract Nonr-266(09), Columbia University Tech Report No. 9, 

 June 1953. 



Timoshenko's theory of flexural motions in an elastic beam takes into 

 account both rotatory inertia and transverse shear delonnation and accordingly, 

 contains two dependent variables instead of the one transverse displacement of 

 classical theory of flexure. For the case of forced motions, the solution involves 

 complications not usually encountered. The difficulties may be surmounted in 

 several ways. The method described here makes use of the property of ortho- 

 gonality of the principle modes of tree vibration and uses the procedure of 

 Mindlin and Cjoodman in dealing with the time-dependent boundary conditions. 

 Thus, the most general problem of forced motion is reduced to a free vibration 

 problem and a quadrature. 



Hermes, R.M., "Dynamic Modeling for Stress Similitude," 

 Contract N8 onr-523. Department of Applied Mechanics, University 

 of Santa Clara, Santa Clara, Calif., June 1949. 



A method of rendering the equations of motion of a vibrating beam in 

 dimensionless form is presented. The parameters, which must be kept constant 

 for modeling for dynamic stress similitude are derived from Uie foregoing dimen- 

 sionless equations of motion. Internal damping is considered and the conclusion 

 is reached that it can be satisfactorily modeled. 



61 



