Experimental Determination of Vibration Parameters Required in the Statistical Energy Analysis Method

1983 ◽  
Vol 105 (3) ◽  
pp. 337-344 ◽  
Author(s):  
B. L. Clarkson ◽  
R. J. Pope
Keyword(s):  
Experimental Determination ◽  
Analysis Method ◽  
Coupling Loss ◽  
Structural Components ◽  
Indirect Methods ◽  
Vibration Parameters ◽  
Theoretical Results ◽  
Dissipation Loss ◽  
Loss Factors

In the high frequency range of vibration the Statistical Energy Method provides one of the most convenient ways of estimating vibration levels in structural components. The dynamic characteristics of the structure are described in terms of the modal densities, dissipation loss factors and coupling loss factors of the component parts. Theoretical and semiempirical results are available for some typical components. This paper describes the development of indirect methods for the experimental determination of these three parameters. Where theoretical results are available the experimental results show reasonable agreement. The results of tests on a range of components are described.

Experimental Determination of the Roller Chain Load Distribution

1983 ◽  
Vol 105 (3) ◽  
pp. 331-338 ◽  
Author(s):  
M. R. Naji ◽  
K. M. Marshek
Keyword(s):  
Experimental Study ◽  
Experimental Determination ◽  
Elastic Properties ◽  
Load Distribution ◽  
Noticeable Effect ◽  
Roller Chain ◽  
Chain Link ◽  
A Chain ◽  
Theoretical Results

An experimental study was conducted to determine the effect of elastic properties, geometric variations, and lubrication on roller chain load distribution. Comparison was made with the theoretical results for a test chain on a 20-tooth sprocket. The load distribution was found for a large number of cases to be independent of the elastic properties of the chain and the sprocket. The load distribution for the chain on a driver sprocket differed from that for a chain on a driven sprocket because of the change in direction of the friction force. Lubrication had no noticeable effect. A large pitch for the sprocket teeth was found to amplify the tension in the chain link.

Line strength factors for E,F1Σ+g(v′ = 0, J′ = J′′) – X1Σ+g (v′′, J′′) (2 + 1) REMPI transitions in molecular hydrogen

2004 ◽  
Vol 82 (6) ◽  
pp. 723-729 ◽  
Author(s):  
Andrew E Pomerantz ◽  
Florian Ausfelder ◽  
Richard N Zare ◽  
Winifred M Huo
Keyword(s):  
Experimental Determination ◽  
Molecular Hydrogen ◽  
Line Strength ◽  
Chem Phys ◽  
Rotational States ◽  
Calculated Line ◽  
Hot Filament ◽  
Theoretical Results ◽  
Line Strengths

Experimentally and theoretically determined line strengths are presented for E,F1Σ+g(v′ = 0, J′ = J′′) – X1Σ+g (v′′, J′′) (2 + 1) REMPI transitions in H2, HD, and D2. The experimental technique employs a hot filament source of internally excited hydrogen that allows experimental determination of line strengths for the low rotational states of highly excited vibrational manifolds (v′′ ≤ 4). The line strengths are found to depend only weakly on J′′ for the states measured here, and theoretical results indicate that the line strengths depend strongly on v′′. These values are combined with previously measured and calculated line strengths for these transitions (K.-D. Rinnen, M.A. Buntine, D.A.V. Kliner, R.N. Zare, and W.M. Huo. J. Chem. Phys. 95, 214 (1991)), resulting in a more complete compilation of REMPI line strengths for molecular hydrogen. Key words: hydrogen, spectroscopy, REMPI, line strength, multiphoton.

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