Structural damping

If structural damping is to be considered, then a revised set of relationships must be used. For a system allowing vertical and horizontal shaft motion, the change in shear and moment across a station is given by ... 

Requirements Imposed on Polymeric Materials by Structural Damping Applications... 

Examples of the Applications of Damping. As was pointed out earlier, structural damping can control "free" responses, i.e., (a) resonant response and spatial... 

Some of what we see as the principal properties and characteristics of import in the development and selection of viscoelastic materials for structural damping are listed below. Table IV notes "passive" properties and characteristics, that is, those that pertain to the material itself and to its performance in the specified operating conditions. Somewhat in contrast. Table V lists "Active or Interactive" properties and characteristics that concern the interaction of the viscoelastic material with other materials and with the environment of the treatment. These tabulations are surely incomplete, but are intended to suggest the breadth of considerations that may be involved in material selection. 

The goal of this paper has been to establish the definition and mechanical principles of structural damping as well as the functional types of applications in which damping can be useful. 

In addition, we have presented several of the important, practical types of damping treatments and the quantitative role of viscoelastic materials in such treatments. The reader should keep in mind several general principles of structural damping as follows ... 

It is our hope that what we have presented here will be of help to those in the field of Polymer Science and Engineering who have an interest in developing materials for application in structural damping. 

A reason for the high catalytic activity in the optimal micelle is, in our opinion, the stabilizing effect of the micellar matrix on the protein conformation. A complementary to the enzyme micellar matrix fixes ( freezes ) the protein structure (damping unfavorable vibrations and protecting the protein from unfolding). 

Hysteresivity, analogous to the structural damping coefihcient used in solid mechanics, is an empirical... 

Tall towers or columns should be checked for dynamic response. If the vessel is above the critical line in Figure 4-7, Rm/t ratio is above 200 or the h/D ratio is above 15, then dynamic stability should be investigated. This section does not consider aerodynamic damping effects, however it is possible that the aerodynamic damping contribution is negative under certain conditions. If this is the case, the overall effect of the structural damping would be reduced. See Procedure 6-5, Vibration of TaU Towers and Stacks, for additional information. 

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