ISSN:0001-4966    

DOI:10.1121/1.1915804

出版商:Acoustical Society of America    

年代:1936

数据来源: AIP

ISSN:0001-4966    

DOI:10.1121/1.1915805

出版商:Acoustical Society of America    

年代:1936

数据来源: AIP

摘要:

A series of round rods of the same diameter were rotated individually about the midpoint of each rod. Vortices are shed from the rods when in motion, giving rise to the emission of sound. With the rotating system placed in the open air, the distribution of sound in space, the acoustical power output, and the spectral distribution have been studied. The frequency of emission of vortices from any point on the rod is shown to be given by the formula of yon Kármán. From the spectrum, estimates are made of the distribution of acoustical power along the rod, the amount of air concerned in sound production, the “equivalent size” of the vortices, and the acoustical energy content for each vortex.

ISSN:0001-4966    

DOI:10.1121/1.1915806

出版商:Acoustical Society of America    

年代:1936

数据来源: AIP

ISSN:0001-4966    

DOI:10.1121/1.1915807

出版商:Acoustical Society of America    

年代:1936

数据来源: AIP

ISSN:0001-4966    

DOI:10.1121/1.1915808

出版商:Acoustical Society of America    

年代:1936

数据来源: AIP

ISSN:0001-4966    

DOI:10.1121/1.1915809

出版商:Acoustical Society of America    

年代:1936

数据来源: AIP

ISSN:0001-4966    

DOI:10.1121/1.1915810

出版商:Acoustical Society of America    

年代:1936

数据来源: AIP

摘要:

The velocity of sound in ethylene dichloride vapor at the boiling point was determined by the use of a resonance tube. The frequency of the sound was measured by comparison with the frequency of a wire of known length under known tension. Resonance was indicated by minimum reactance of the acoustical impedance of the tube of gas, on the source of sound as the length of the tube was changed by moving a piston. The precision of the apparatus was verified by preliminary measurements with air at 23.5°C and steam at 98.5°C. The values found agree to within 0.5 percent of the results of previous observers. For ethylene dichloride, said to be 99.5 percent pure and so checked by means of its boiling point, the velocity of sound was found to be 176.2 meters per second at 83.7°C.

ISSN:0001-4966    

DOI:10.1121/1.1915811

出版商:Acoustical Society of America    

年代:1936

数据来源: AIP

ISSN:0001-4966    

DOI:10.1121/1.1915812

出版商:Acoustical Society of America    

年代:1936

数据来源: AIP

ISSN:0001-4966    

DOI:10.1121/1.1915813

出版商:Acoustical Society of America    

年代:1936

数据来源: AIP