This paper investigates the validity of tuned inertial mass electromagnetic transducer (TIMET) applied to building structures subjected seismic motions. The TIMET is a device inspired by two innovative structural control devices proposed recently, that is, viscous damper and transducer. consists spring, an produced ball screw mechanism, part composed motor electrical circuit. stiffness spring such resonates with vibrating building. makes installed in parallel run up efficient way, vibration...

This research reports on the experimental verification of an enhanced energy conversion device utilizing a tuned inerter called inertial mass electromagnetic transducer (TIMET). The TIMET consists motor, rotational mass, and tuning spring. motor are connected to ball screw spring interfaced is vibrating structure. Thus, vibration structure absorbed as electrical by motor. Moreover, amplified can be realized rotating relatively small physical masses. Therefore, designing stiffness...

Traditional passive base-isolation systems provide an effective means to mitigate the responses of seismically excited structures. A challenge for these can be found in accommodating large base displacements during severe earthquakes. Recently, active systems, combining actively controlled actuators with isolation bearings, have been shown experimentally produce reduced displacements, while maintaining similar superstructure obtained by systems. The control devices used hybrid are typically...

Offshore wind turbines (OWTs) are considered vital to the promotion of development renewable energy. Especially, floating OWTs can be deployed over a larger area than bottom-fixed OWTs. The OWTs, however, vulnerable vibration induced by disturbances and require backup power supply in case outage. On one hand, various kinds inerter-based devices have been proposed especially for suppression civil structures subjected earthquake loadings. Recently, combined with electromagnetic devices,...

This letter proposes a new iterative ISI equalization algorithm that offers low computational complexity: order L/sup 2/ with channel memory length L. The proposed is an extension of Reynolds and Wang's SC/MMSE (soft canceler followed by MMSE filter) equalizer: approximations are used properly to reduce the complexity. It shown in do not cause any serious performance degradations from trellis-based algorithms.

Multiple-input multiple-output (MIMO) wireless networks are communication systems composed of multiple nodes, each which is equipped with antennas. As proven by earlier studies, point-to-point MIMO offer significant capacity through spatial multiplexing and diversity techniques. Furthermore, recent studies have shown that the can be greatly improved using relay nodes to messages simultaneously from source destination. This paper proposes a relaying scheme for networks. Its major concepts...

To realize an optical integrated circuit, various losses in the semiconductor waveguide such as absorption loss, bending and coupling have to be minimized. Theoretical experimental considerations for reduction of these been presented. A propagation loss less than 0.5 dB/cm has observed a well-designed GaAs ridge waveguide. Moreover its with polarization-maintaining fiber decreased below 1.5 dB.

Abstract We present a vertical vibration isolator having piecewise‐constant restoring force, which belongs to class of passive and nonlinear isolators. In isolation, direct use low‐stiffness elements leads unacceptably large deformations due self‐weight. To overcome the difficulty, we apply combination constant‐force springs, each sustains constant load regardless its stretch. By arranging so that has alleviate problem excessive deformation caused by self‐weight, provide stability at static...

Traditional mechanical damping systems employ dissipative components, such as viscous dampers, to absorb energy from an externally excited vibratory structure, and dissipate this heat. By contrast, self-powered transducers convert absorbed into electrical energy, which is then managed in network. This enables the network intelligently control adapt properties of devices real-time, use extracted power intelligence electronic subsystems. In order for system have energy-autonomy, must extract...

This paper proposes a novel vibration energy harvesting device employing tuned variable inerter. The inerter is that can produce an amplified inertial mass effect by ball screw or rack and pinion mechanisms. Originally, the was developed for suspensions in automobiles, various kinds of technologies have been widely studied not only structural control but also so far. As example such devices, electromagnetic transducer has proposed, its effectiveness as shown already. However, at same time,...

To realize an optical integrated circuit, various losses in the semiconductor waveguide such as absorption loss, bending and coupling have to be minimized. Theoretical experimental considerations for reduction of these been presented. A propagation loss less than 0.5 dB/cm has observed a well-designed GaAs ridge waveguide. Moreover its with polarization-maintaining fiber decreased below 1.5 dB.