Progress in the application of active vibration control technologies to long‐span bridges in Japan

Tanida, Koji

doi:10.1002/pse.124

Cited by 11 publications

(7 citation statements)

References 5 publications

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“…Alternatively, voice coil actuators [2,4,6,[15][16][17][18][19][20][21][22][23][24][25] can better excite flexural modes of structures at low frequencies, generating a point force control excitation with a high force/weight ratio [13]. For this reason, they have been widely used to control vibration in floors [9,26], aircraft structures [27], instruments for aerospace applications [28], buildings [29], and bridges [30].Depending on the design, two types of voice coil actuators can be adopted: reactive and inertial. For reactive actuators, the magnet or the coil is mounted on the structure.…”

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confidence: 99%

Parametric study on the optimal tuning of an inertial actuator for vibration control of a plate: Theory and experiments

Camperi¹,

Tehrani²,

Elliott³

2018

Journal of Sound and Vibration

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This paper presents a theoretical and experimental tuning of the velocity feedback gain of a plate with an inertial actuator. The objective of the study is to analyse a direct velocity feedback control unit, which can be tuned locally and yet providing a global vibration reduction. This is achieved through the knowledge of the velocity signal and the actuator dynamics, without information on the plate dynamics. In practice, an electrical input is provided to the actuator, proportional to the local velocity of the structure, in such a way to generate active damping. The tuning is performed by maximising the power absorbed by the inertial actuator from the structure, and this is shown to be equivalent to the minimisation of the global level of vibration, estimated through the kinetic energy of the structure. Nine accelerometers have been used, and the performance for several values of different feedback gains has been investigated. Moreover, the influence of the frequency range of integration in the tuning of the velocity feedback gain is considered, and it is found experimentally that a broadband reduction up to 5 dB can be achieved, as expected from the numerical model. The absorbed power from the plate by the control unit is found to be negative below the first natural frequency of the inertial actuator, when the feedback control is implemented. This is due to the fact that, although a collocated velocity feedback is implemented, the control system is only conditionally stable because of the actuator dynamics. The performance of active control is found to reduce dramatically, if instability occurs for gains lower than the optimal one. For this reason, the work is enriched with a parametric study on the plate-actuator pair, in which the influence of the dynamic properties of the plate and the inertial actuator are investigated. The effectiveness of the active control is found to depend on the mass ratio between the actuator and the plate. In particular, for low mass ratios, the system well approximate the ideal case, in which a control force is proportional to the velocity of the plate, but for high mass ratios, a small amount of active damping can be introduced.The flexural dynamic behaviour of lightly damped structures subjected to broadband random excitation, at low frequencies, is mostly determined by their resonances, which can be effectively reduced with active damping. This can be achieved with several control strategies based on a collocated actuator and sensor pair, which provides good stability properties [2]. For example, direct velocity feedback consists of generating a control force proportional to the local velocity of the structure, in which the controller design is reduced to tuning the feedback gain. Engels et al. [3] showed that a decentralised direct velocity feedback control system provides remarkable performance when compared to the equivalent Linear Quadratic Gaussian regulator. This inspired the work presented in this paper on the possibility of having a self-contained control unit, which c...

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confidence: 99%

Parametric study on the optimal tuning of an inertial actuator for vibration control of a plate: Theory and experiments

Camperi¹,

Tehrani²,

Elliott³

2018

Journal of Sound and Vibration

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“…To overcome this inefficiency, actively controlled mass dampers have been developed and this technology has been applied. [74][75][76] One example of such application is the hybrid-mass damper (HMD) used during construction of the Akashi-Kaikyo Bridge pylons. HMD is a combination of passive TMD and active control actuator.…”

Section: Viv Mechanism On Bridge Structuresmentioning

confidence: 99%

Vibration Mechanisms and Controls of Long-Span Bridges: A Review

Fujino

Siringoringo

2013

Structural Engineering International

124

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Dynamic performance is an important consideration in long-span bridge design. Owing to its flexibility an d low damping, various types of vibration from different sources of excitation could occur during the lifetime of a long-span bridg e. This paper reviews important studies and developments on long-span bridge vibration mechanism an d control under wind, seismic,traffic and human-motion excit ations. Types of vibration commonly observed on the long-span bridge are discussed from the viewpoint of structure engineering. Discussion for each subject is commenced by describing the vibration mechanism followed by the survey on observed phenomena in many long-spa n bridges associated with the type of vibration. The paper also describes the engineering solutions adopted as countermeasures for each type of bridge vibration problem.

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“…Since the concept of active control was initiated [1], there have been many researches on active control system, followed by practical applications to many civil structures [2][3][4][5][6][7][8][9][10]. In the design of control system, one of the main concerns is to obtain a satisfactorily performing system no matter what disturbances occur.…”

Section: Introductionmentioning

confidence: 99%

Modal-space reference-model-tracking fuzzy control of earthquake excited structures

Park¹,

Ok²

2015

Journal of Sound and Vibration

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Progress in the application of active vibration control technologies to long‐span bridges in Japan

Cited by 11 publications

References 5 publications

Parametric study on the optimal tuning of an inertial actuator for vibration control of a plate: Theory and experiments

Parametric study on the optimal tuning of an inertial actuator for vibration control of a plate: Theory and experiments

Vibration Mechanisms and Controls of Long-Span Bridges: A Review

Modal-space reference-model-tracking fuzzy control of earthquake excited structures

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