Experimental evaluation of a self-powered smart damping system in reducing vibrations of a full-scale stay cable

Cheng

Structural Contr & Hlth

et al. 2022

Recent studies have demonstrated that inerter-based dampers exhibit superior performance in mitigating cable vibration over conventional passive viscous dampers (VDs). This paper develops a new inerter-based damper called the eddy-current inertial mass damper (ECIMD), which consists of a rotary eddycurrent damping element and a paralleled ball screw inertial mass element.Inspired by the advantages of two VDs on a single stay cable, the damping of a stay cable with two ECIMDs, either at opposite cable ends or the same cable end, was investigated through theoretical analysis, experimental study, and parameter optimization. First, the mechanical model of the ECIMD was derived from the geometrical configuration, and its effectiveness was verified through mechanical performance tests on two ECIMD prototypes. Subsequently, theoretical analysis models of the cable-ECIMD system were established by considering the cable sag, flexural stiffness, and boundary conditions. Furthermore, control performances of a model cable attached with two ECIMDs were experimentally evaluated. Finally, the multimode damping effect of two ECIMDs at the same cable end was highlighted through parameter optimization. Results show that when two ECIMDs are installed at opposite cable ends, the coupled single-mode damping effect of two ECIMDs is approximately the sum of individual contributions from each ECIMD. When mechanical properties of two ECIMDs at the same cable end can match well with each other, the coupled single-mode and multimode damping effect of two ECIMDs can be significantly enhanced compared with that of a single ECIMD installed at a further distance away from the cable anchorage.

Section: Two Ecimds At the Same Cable Endmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Damping of a stay cable with two eddy‐current inertial mass dampers: Theoretical analysis, experimental study, and parameter optimization

Cheng

Structural Contr & Hlth

et al. 2022

Trans. Can. Soc. Mech. Eng.

“…Later, Suda et al (2004) designed an energy recycling system using an electromagnet (EM) as the vibration-absorber. Several other researchers developed energy harvesters for cars including the one by Choi and Wereley (2009), which comprises a rotor, permanent magnet, and a MR damper, a smart EM harvester by Kim et al (2010), and a piezoelectric harvester by Xiao et al (2015). One drawback of the aforementioned energy harvesters is that they require complicated feedback control.…”

Section: Introductionmentioning

confidence: 99%

Energy harvesting from car suspension using a single magnet device

Chiu

Karkoub

Her

2022

The need for renewable energy sources and harvesting devices has increased over the years for environmental and economic reasons. Cars for example have gone through an important transformation in the past decade which led to the inception of the hybrid type. The idea is to harness some of the dissipated energy and reuse it to operate the car. A lot of energy is dissipated from the suspension system; therefore, harnessing that energy could be very useful in powering up electrical systems in the car. A magnetic mass-spring system to harvest the vibrational energy dissipated from the car’s suspension system and three dimensionless comfort levels for the passenger are presented. To maximize the regenerated electricity indicator and minimize the discomfort indices, a multi-objective function based on the above indices in conjunction with the Simulated Annealing method is used. The theoretical developments are demonstrated under constant and varied driving speeds and the simulation results show the energy harvester is capable of producing reasonable amounts of electricity while maintaining a good comfort level. Results reveal that the harvester can generate 0.045 Volts when the car travels at 60 km/h with an acceleration of 0.43 m/s2 and assumed base excitation amplitude of 0.05 m.

“…MRF is most commonly used in dampers, especially in (a) the primary suspension systems of vehicles [ 8 , 9 , 10 , 11 , 12 , 13 ], (b) the secondary suspension of driver seats in trucks [ 14 , 15 , 16 , 17 , 18 ], (c) the damping of vibration for seismic activity protection [ 19 , 20 , 21 , 22 ], or (d) the damping of cable bridge vibrations caused by wind and rain [ 23 , 24 ]. Semi-active control can be easily applied to magnetorheological (MR) dampers.…”

Section: Introductionmentioning

confidence: 99%

Novel Approaches to the Design of an Ultra-Fast Magnetorheological Valve for Semi-Active Control

et al. 2021

This article presents a list of suitable techniques and materials leading to the design of an ultra-fast magnetorheological (MR) valve. Two approaches for achieving the short response time are proposed: (a) by means of material, and (b) by means of the shape. Within the shape approach, the revolutionary technique of 3D metal printing using a selective laser melting (SLM) method was tested. The suitability of the materials and techniques is addressed based on the length of the response time, which is determined by the FEM. The simulation results determine the response time of the magnetic flux density on the step signal of the current. Subsequently, the response time is verified by the measurement of the simple magnetorheological valve. The following materials were tested: martensitic stainless steel AISI 420A (X20Cr13), cutting steel 11SMn30, pure iron for SLM, Sintex SMC STX prototyping material, ferrite N87, and Vacoflux 50. A special technique involving grooves was used for preventing eddy currents on materials with a high electrical conductivity. The simulation and experimental results indicate that a response time shorter than 2.5 ms can be achieved using materials such as Sintex SMC prototyping, ferrite N87, and grooved variants of metal pistons.