Damping configurations

Wetton XSl has described the mechanical characteristics for vibration damping materials in terms of the frequency and temperature dependence of the viscoelastic properties of polymeric materials. Use of polymeric materials in free-layer and constrained layer damping configurations has been discussed in the literature by Ungar (10-12). Kerwin (13.14). and others (15.16). 

Two widely applied damping configurations that use viscoelastic materials are the free viscoelastic layer and the constrained viscoelastic layer, as shown in Fig.9a and 9b. The deformation of the viscoelastic layer is extensional in the first case and shear in the second case. Both these deformations are highly damped by intrinsic absorption in the viscoelastic polymer. In the case of the free viscoelastic layer (Fig.9a) it flexes with the plate participating in the bending stiffness as part of a two-layer beam. The viscoelastic layer must be tightly bonded to the plate and must be continuous over a... 

Damping Configurations that Utilize Viscoelastic Materials... 

Multiple-Layer Segmented Treatments. Another interesting damping configuration involves the use of multiple-layer segmented constrained layers. See Figure 10. This configuration was patented by Painter (2, 2 i) and has been analyzed by Warnaka, Kerwin, and Carbonell ( ) and by Plunkett and Lee (24.). ... 

Select the appropriate damping materials and basic damping configuration. 

Two types of damping configuration are in common use. Application of a single layer of polymer on the vibrating surface is called extensional... 

Flexible rotor balancing must be performed with the rotor whirl configuration approximating the mode in question. The operating speed(s) is in the vicinity of a major flexible mode resonance (damped critical speed). As these two speeds approach one another, a tighter... 

As one can see, there is the familiar choke input filter (T-C) on the output, which is characteristic of the buck and all forward-mode converters. The configuration shown in Figure 4—10 is called a parallel resonant topology because the load impedance (the T-C filter acting as a damping impedance) is placed in parallel to the resonant capacitor. The input to the T-C filter stage... 

The L C combination, whether it is a series or parallel configuration, is an oscillatory circuit, which in the absence of resistance as a damping agent will oscillate indefinitely. Because all electrical circuits have resistance associated with them, the oscillations eventually die out. The frequency of the oscillations is called the natural frequency, fQ. For the L-C circuit ... 

Furthermore, design modifications to the STR were also considered equipping the STR with marbles to ensure a larger distribution of the gel beads inside the reactor while damping down the shearing effect of the Rushton impeller and equipping the STR with a perforated stainless still cylinder that confines the beads in the external cavity between the reactor walls and the impeller zone. A description of the explained configurations is shown in Fig. 1. 

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