This paper discusses the damping measurements on cables with real-time controlled MR dampers that were performed on a laboratory scale single strand cable and on cables of the Sutong Bridge, China. The control approach aims at producing amplitude and frequency independent cable damping which is confirmed by the tests. The experimentally obtained cable damping in comparison to the theoretical va...

The damping mechanism of a recently discovered trapped-particle mode is identified as collisional velocity scattering of marginally trapped particles. The mode exists on non-neutral plasma columns that are partially divided by an electrostatic potential. This damping mechanism is similar to that responsible for damping of the dissipative trapped-ion mode. The damping rate is calculated using a ...

An increase of the NLC repetition rate from 120 Hz to 180 Hz while keeping other interaction point parameters unchanged will require changes in the design of the damping rings to provide an increased damping rate. In this note, we describe an initial lattice design for a ring that provides the required damping at 90 Hz. Two such rings, operated in series or in parallel, would provide the requir...

The new techniques in seismic design of structures are usually attributed to high damping ratios. In such systems, the assumption of classical (i.e. proportional) damping is not valid and in most cases they should be considered as Non-classical systems. Since the analytical tools for studying the behavior of such structures are not easily available, the present work attempts to find the limits,...

This paper discusses static and dynamic response of nanoplate resting on an orthotropic visco-Pasternak foundation based on Eringen’s nonlocal theory. Graphene sheet modeled as nanoplate which is assumed to be orthotropic and viscoelastic. By considering the Mindlin plate theory and viscoelastic Kelvin-Voigt model, equations of motion are derived using Hamilton’s principle which are then solved...

We present results for step-strain experiments and the resulting damping functions of polyethylene blends of different structures, including solutions of linear, star and comb polymers. Remarkably, an entangled melt of combs exhibits a damping function close to that for entangled linear chains. Diluting the combs with fasterrelaxing material leads to a more nearly constant damping function. We ...

The damping effect of the free-streaming neutrinos on second order gravitational waves is investigated in detail. We solve Boltzmann equation and give anisotropic stress induced by to order. first tensor its coupling with scalar perturbations are considered. analytic equations kernel functions finally obtain energy density spectrum. results show that suppress spectrum significantly for low freq...

W DU and H F WANG Southeast University, Nanjing, China Abstract – Damping torque analysis is a technique developed based on classical control theory for the excitation implemented damping control in power generation, which has been widely used in engineering practice since it was proposed. This paper proposes the damping torque analysis for DC bus implemented damping control in power transmissi...

Ground-motion prediction equations that are used to predict acceleration values are generally developed for a 5% viscous damping ratio. Special structures and structures that use damping devices may have damping ratios other than the conventionally used ratio of 5%. Hence, for such structures, the intensity measures predicted by conventional ground-motion prediction equations need to be convert...

Recent design of buildings utilizes different strategies to mitigate the lateral displacement and acceleration from wind and earthquake excitation. One of the strategies is to dissipate external energy with dampers. For high-rise buildings, outrigger systems which connect the core and perimeter columns are innovative system, which to combine stiffness of both the core and perimeter columns to r...