Rik'hnmnn, E. und Jasper, N.H., "Vihration Measure- 

 nionls on Port Propulsion System of IISNS POINT BARROW 

 (T-\KD-1)," DTMB Report 1-286, December 1958. 



Vibtdtions were measured to determine the cause of an engine 

 ^ dsualtv. Large torque variations of the propeller shaft occurred at 

 very low rpni and generated thrust variatiOTi. These vibrations are 

 probably self-excited by large binding forces at the shaft bearings. 

 Vihration resonances at turbine and double-turbine frequencies occurred 

 at the turbine housing at about 140 shaft rpm and are probably excited 

 by unbalance in the turbine system. 



Btichmann, E. and McConnel, J.D., "Environmental 

 Conditions of Ship Motions and Vibrations for Design of 

 Radar Systems on Destroyers and .Aircraft Carriers," DTMB 

 Report l-_'98, 1959. 



Ripid-body motions and vibrations measured over a long period 

 of time and a wide range of operating conditions are used to determine 

 the environmental conditions of vibration and ship motion for use in the 

 design of radar installations. Extreme values for ship motions in severe 

 seas are predicted. Application of the data to design problems are 



Buckingham, E,, "Model Experiments and the Forms of 

 Emperical Equations," Trans ASME, Vol, 37, 1915. 



Chuang, Sheng-Lun, "The TMB Flexing Stress Monitor," 

 DTMB Report 1560, February 1962. 



A Flexing Stress Monitor has been developed to measure Uie 

 strains and to compute, record, and display the associated stresses 

 experienced by a ship at sea. The continuous records are suitable for 

 statistical analysis at a later date to provide general information of 



Church, J.W, and Andrews, J.N., "A Model for the 

 Simulation of the Transient Vibration Resulting from Wave 

 Impact Loads on a Naval Vessel," Presented at Shock and 

 \ ibration Colloquium, Annual Meeting ASME, November 

 196.i, 



A structural model of an aircraft carrier has been designed and 

 tonslrucled in order to study the transient vibratory response of the 

 ship to impact-type wave loads. Tests will be ronducted at various 

 speeds in regular and irregular seas. Test objectives are to establish 

 the validity of model simulation techniques through comparison with 

 lull-scale results and to provide data for evaluation of analog computer 



Corhftt, J. P., "Summary of Transformations Useful in 

 Con.-tructing Analogs of Linear Vibration Problems," 

 AIEE Trans, Vol. 68, 1949. 



This paper is concerned with the problem of representing linear 

 vibration systems m terms of electric circuits. The system under study 

 IS represented by linear differential equations with constant coefficients. 



Crawford, Lyndon and Ruby, William J., "Model Tests 

 on Hull-Deckhouse Interaction," BuShips Project 

 n;S-7.'',1-10.S4, Final Report Project No. SR 121, SSC 67, 

 1955. 



Crawford, Lyndon, "Theory of Long Ships' Super- 

 structures," SNAME Trans. Vol. 58, p.69.3, 1950. 



The apparent tendency of fundamental hull stresses to be attenu- 

 ated in the lupervtructure of passenger ships has been verified by model 

 tests. This action seems to result from the lack of a sufficient number 

 of solid supports for the longitudinal load carrying members. Means for 

 providing greater structural efficiencies for superstructures are apparantly 

 economies in steel hull weight. 



lilable, which i 



Criner, E., eU al., "A New Device for the Solution of 

 Transient Vibration Problems by the Method of Electrical- 

 Mechanical Analogy," Journal of Applied Mechanit's, 1945, 



Crook, Mary C, "Summary of Reports on Vibration 

 Surveys Issued during 1959," DTMB Report 1402, January 

 1960. 



This report contains a listing of DTMB Vibn 

 issued in 1959 and Dr. N.H. Jasper's comments on i 

 conducted on the USS SKIPJACK (SSN 585). 



I Survey Repori 



Crumb, S.F., "A Study of the Effects of Dampihg on 

 Normal Modes of Electrical and Mechanical Systems," 

 California Institute of Technology, Tech Report 2, Air 

 Research and Development Command, Office of Scientific 

 Research, Contract AF 18(600)-669, Project R-354-.30-1, 

 1955. 



Cummings, John T., "Calculated Natural Vertical Hull 

 Frequencies and Normal Modes of Surveying Ship AGS 26," 

 DTMB Report 1704, March 1963. 



The normal mode shapes, natural frequencies and bending moment 

 distributions of flexural vibration of the hull were calculated. The 

 parameters used in calculations with a digital computer are tabulated. 



Cummings, John T., "Vibration of Radar Mast Measured 

 on USS LONG BEACH (CGN 9) and USS OKINAWA (LPH 3)," 

 DTMB Report 1789, December 1963. 



Maximum amplitudes and accelerations measured on the radar mast 

 of USS OKINAWA (LPH 3) and USS LONG BEACH (CGN 9). are presented. 

 Amplitudes and acceleration due both to propeller-blade and shaft 

 frequencies and to maneuvers are included. 



Davenport, W.W., et. aU, "A Substitute-Stringer Approach 

 for Including Shear-Lag Effects in Box-Beam Vibrations," 

 NACA TN 3158, 1954,' 



The use of the sub 

 ;n the calculation of tn 

 liscussed. Va 



;tringer approach for including shear 

 transverse modes and frequencies of box beam 

 thin-walled hollow rectangular beams of unifor 



wall thickness are idealized by means 

 and the resulting frequencies of the idt 

 with those of the original beams. The 

 zation could be made in order to yield 



sheai-lag effect in dynamic analysis. 



the substitute-stringer approach 

 zed structures are compared 

 :ults indicate how the ideali- 

 urate representation of the 



Davidson, Samuel, "Vibration Measurements Made 

 n July 1947 on USS ODAX (SS 484)," DTMB Report C-3, 

 August 1947. (Declassified). 



Certain vibrations were re. 

 primarily to a. stabilizer which ws 

 propeller shaft. After the stabili. 



ck from the propellers, 

 ■crease in the level of 



59 



