Tachmindji, A.J. and Dickerson, M.C., "The Measure- 

 ment of Oscillation Pressures in the Vicinity of Propellers, 

 DTMD Report 1130, April 1957. 



propelle 



eport presents 

 a function of v 



Tnchmindji, A.J. and Dickerson, M.C, "The Measure- 

 monl of Thrust Fluctuations and Free Space Oscillating 

 Pri>ssurori for a Propeller," DTMB Report 1107, January 

 1957, 



This report presents a method of measuring the thrust fluctuation 

 produced by a propeller and the oscillating pressure at a point near a 



T^inkonas, S. and Breslin, J. P., "Longitudinal Blade- 

 Frequency Force Induced by a Propeller on a Prolate 

 Spheroid," Stevens Institute of Technology, Davidson 

 Lal)orator\ Report 855, March 1963. 



An expression is developed for the longitudinal component 

 of the vibratory force exerted on a prolate spheroid by the operation of 

 a marine propeller in a space-varying field (wake). Numerical calcula- 

 tions indicate the important role played by propeller clearance and 

 slendemess ratio in the magnitude of the vibratory force. 



Tsakonas, S., Breslin, J. P. and Jen, N., "Pressure 

 Field Around a Marine Propeller Operating in a Wake," 

 Journal of Ship Research, Vol. 6, No. 4, April 1963, 



This paper reports the effect of nonuniform inflow conditions on 

 the vibratory pressure generated by a marine propeller, as determined 

 by the consideration of two mathematical models. 



Tsakonas, S, and Breslin, J.P., "Pressure Field Near 

 Counterrotating Propellers," Stevens Insititute of Tech- 

 nology, Da\idson Laboratory Report 858, September 1961. 



Expressions for the vibratory pressure field produced by an 

 operating counterrotating propeller system are developed in terms of 

 first and second blade harmonics of the individual propellers. Pressure 

 signal can be obtained from the sum of the individual propellers by 



nterference 

 ng propelle 



nlribu 



; little to vibratory 



nuch superi 

 IS vibration 



• tha 



Tsakonas, S., Breslin, J.P., and Chen, C.V., "Sound 

 Pressure Field Generated by a Marine Propeller Operating 

 in a Wake," Stevens Institute of Technology, Davidson 

 Laboratory Report 832, February 1961. 



nflow 



1 the 



This paper deals with the effect of nonuniform i 

 sound pressure generated by a marine propeller. The inflow is con- 

 sidered in terms of its harmonic components. The effect of non- 

 uniformity far overshadows the uniform flow contribution to the sound 

 pressure at points far from the propeller, whereas in the near field the 

 nonunifonnity accounts for 10 to 40 percent of the total pressure signal. 

 The effects of compressibility, direcUonal properties of the field, 

 planform blade shape, and effective radius were also studied. 



\ane, F.F., "A Guide for the Selection and Application 

 of Resilient Mountings to Shipboard Equipment, Revised," 

 DTMB Report 880, February 1958. 



es for the sc 

 ard equipme 



n prepared to provide guidance to desij 

 and application of resilient mountings t 

 he more commonly encountered arrange 

 ve been simplified and systematized as 



Vane, F.F., "Vibration-Generator Tests of the Propul- 

 sion-System Reduction Gear Unit on the USS DEALEY 

 (DE 1006)," DTMB Report 10.38, May 1956. 



A vibration-generator test was performed on the reduction-gear 

 unit of the propulsion system with the line shaft uncoupled. The 

 resonant frequency of 660 cpm corresponds with a longitudinal spring 

 constant of the foundation of 1.76 x 10* lb/in. Additional data were 

 obtained for use in a general study of propulsion units and their 

 foundations. 



Wigle, B.M. and Jasper, N.H., "Determination of 

 Influence Coefficients as Applied to Calculation of 

 Critical Whirling Speeds of Propeller-Shaft Systems," 

 DTMB Report 1050, May 1957. 



Formulas developed at DTMB for computing the critical 

 frecpiencies of whirling shafts require influence coefficients in their 

 application. This report describes methods of determining the 



innu 



effic 



Wigle, B.M., "Vibration-Generator Tests of the Propel- 

 ler Shaft of the USS FORREST AL (CVA 59)," DTMB 

 Report 1007, July 1956. 



A vibration-generator test was conducted on an Alloy 4 propel- 

 FORRESTAL to detennine the natural 



shaft : 





italled < 



compared with i 



1 latera 



ed by the 



The expe 

 iretical i 



tal data 



ethods 



Yeh, H.Y., "Thrust and Torque Fluctuations for 

 APA 249, DTMB Model 4414," DTMB Report 1364, 

 January 1960. 



A velocity survey was conducted on Model 4414 to obtain d 

 needed to calculate the thrust and torque fluctuations due to non- 

 uniform wake distribution over the propeller disk for the APA 249. 



77 



