Determination of structural coupling loss factors by modal coupling approach

1990 ◽  
Vol 88 (S1) ◽  
pp. S21-S22
Author(s):  
Jie Pan ◽  
Paul Bremner
Keyword(s):  
Coupling Loss ◽  
Structural Coupling ◽  
Modal Coupling ◽  
Coupling Approach ◽  
Loss Factors

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.

Determination of Non-Conservative Coupling Loss Factors Between Rotating Machinery Components

1991 ◽  
Author(s):  
J. M. Cuschieri ◽  
J. C. Sun ◽  
F. Journeau
Keyword(s):  
Experimental Results ◽  
Coupling Loss ◽  
Analysis Model ◽  
Impedance Function ◽  
Dissipation Term ◽  
Interface Characteristics ◽  
Film Interface ◽  
Good Agreement ◽  
Loss Factors

Abstract An expression for calculating the coupling loss factors between non-conservatively coupled substructures is derived based on the characteristics of the coupled substructures and the interface medium. The expressions consists of point mobility functions evaluated on the substructures near or at the junctions and a joint impedance function which represents the interface characteristics. The point mobility functions can be obtained analytically, for simple structures, or experimentally. The joint impedance is modeled by a dissipative stiffness element. The derived expressions for the coupling loss factors simplify to the well known expressions for conservative coupling when the dissipation term tends to zero. This approach is used to estimate the coupling loss factor between a shaft and a bearing liner with an oil film interface. The estimated results for the coupling loss factors are compared to experimental results obtained from a statistical energy analysis model. The estimated results and the experimental results show good agreement which verifies the approach used for the determination of the non-conservative coupling loss factors.

Measurement of SEA coupling loss factors using point mobilities

1994 ◽  
Vol 346 (1681) ◽  
pp. 465-475 ◽  
Keyword(s):  
Coupled Systems ◽  
Coupling Loss ◽  
Good For ◽  
Loss Factors

In this paper calculation of SEA coupling loss factors, using measured point mobility, is derived for coupled systems, homogeneous or not, with rigid or soft links. Some simplifications and hypothesis are necessary to fit with SEA basic relations. To validate the theory an experiment was done on plates coupled in three points; the agreement is reasonably good for homogeneous and non-homogeneous plates.

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