Efficient optimal design and design-under-uncertainty of passive control devices with application to a cable-stayed bridge

Dynamic vibration absorbers are simple mechanical devices that are attached to a structure aiming at reducing vibration levels. Designing such devices for vibration control of mechanical systems using viscoelastic materials results in low costs, easy construction, and higher efficacy due to their ability to dissipate vibration energy. In this context, the present study aims at developing a methodology for an optimal design of a set of viscoelastic dynamic absorbers considering their natural frequencies, the positions to attach them onto the structure to be controlled, and the viscoelastic materials as variables to be optimized for different working temperatures. The optimal configuration is obtained by applying a hybrid optimization technique, which uses genetic algorithms (considering continuous and discrete variables in the same design vector) aiming at approximating the global minimum point and, subsequently, a nonlinear programming method (simplex based on the Nelder–Mead method) to perform a local search. An example of dynamic absorber design to reduce vibration levels in a one-degree-of-freedom (DOF) system and on a steel plate (multiple-DOFs) is presented. The results show the efficacy of the methodology for passive control of vibrations acting on a broadband of frequencies and different temperatures.

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Vibration Control Systems for Sensitive Equipment: Limiting Performance and Optimal Design

Shock and Vibration ◽

10.1155/2005/916438 ◽

2005 ◽

Vol 12 (1) ◽

pp. 37-47 ◽

Cited By ~ 3

Author(s):

V.M. Ryaboy

Keyword(s):

Optimal Design ◽

Control Problem ◽

Vibration Control ◽

Control Systems ◽

Product Line ◽

Control Problems ◽

Wide Field ◽

Physical Mechanisms ◽

Physical Effects ◽

Control Devices

As vibration control requirements become increasingly stringent, designers and users of vibration control equipment turn to devices and systems combining various physical mechanisms. Subsystems based on different physical effects can be combined to achieve the optimal performance for the application. Building an optimal product line that would cover a wide field of applications by combining several products, as opposed to creating one optimal device for a particular application, presents an optimum vibration control problem. This paper reviews optimum vibration control problems based on the idea of limiting performance, and discusses recent development of vibration control devices.

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Passive Control System for Mitigation of Longitudinal Buffeting Responses of a Six-Tower Cable-Stayed Bridge

Mathematical Problems in Engineering ◽

10.1155/2016/6497851 ◽

2016 ◽

Vol 2016 ◽

pp. 1-18 ◽

Cited By ~ 2

Author(s):

Fangfang Geng ◽

Youliang Ding ◽

Aiqun Li

Keyword(s):

Viscous Fluid ◽

Optimization Design ◽

Passive Control ◽

Bridge Deck ◽

Design Method ◽

Nsga Ii ◽

Cable Stayed Bridge ◽

Base Forces ◽

Fluid Dampers ◽

Viscous Fluid Dampers

This paper presents an investigation of mitigation of longitudinal buffeting responses of the Jiashao Bridge, the longest multispan cable-stayed bridge in the world. A time-domain procedure for analyzing buffeting responses of the bridge is implemented in ANSYS with the aeroelastic effect included. The characteristics of longitudinal buffeting responses of the six-tower cable-stayed bridge are studied in some detail, focusing on the effects of insufficient longitudinal stiffness of central towers and partially longitudinal constraints between the bridge deck and part of bridge towers. The effectiveness of viscous fluid dampers on the mitigation of longitudinal buffeting responses of the bridge is further investigated and a multiobjective optimization design method that uses a nondominating sort genetic algorithm II (NSGA-II) is used to optimize parameters of the viscous fluid dampers. The results of the parametric investigations show that, by appropriate use of viscous fluid dampers, the top displacements of central towers and base forces of bridge towers longitudinally restricted with the bridge deck can be reduced significantly, with hampering the significant gain achieved in the base forces of bridge towers longitudinally unrestricted with the bridge deck. And the optimized parameters for the viscous fluid dampers can be determined from Pareto-optimal fronts using the NSGA-II that can satisfy the desired performance requirements.

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Vibration Control Devices for Building Structures and Installation Approach: A Review

Civil and Environmental Engineering Reports ◽

10.2478/ceer-2019-0018 ◽

2019 ◽

Vol 29 (2) ◽

pp. 74-100 ◽

Cited By ~ 1

Author(s):

Waseem Sarwar ◽

Rehan Sarwar

Keyword(s):

Energy Dissipation ◽

Vibration Control ◽

Passive Control ◽

Search Algorithm ◽

Structural Response ◽

Building Structures ◽

Analysis And Design ◽

Control Devices ◽

Energy Dissipation Devices ◽

Energy Absorbing

Abstract Retrofit and structural design with vibration control devices have been proven repeatedly to be feasible seismic hazard mitigation approach. To control the structural response; supplemental energy dissipation devices have been most commonly used for energy absorption. The passive control system has been successfully incorporated in mid to high rise buildings as an appropriate energy absorbing system to suppress seismic and wind-induced excitation. The considerable theses that are highlighted include vibration control devices, the dynamic behavior of devices; energy dissipation mechanism, devices installation approach and building guidelines for structural analysis and design employing vibration control devices also, design concern that is specific to building with vibration control devices. The following four types of supplemental damping devices have been investigated in this review: metallic devices, friction devices, viscous fluid devices, and viscoelastic devices. Although numerous devices installation techniques available, more precisely, devices installation approaches have been reviewed in this paper, including Analysis and Redesign approach (Lavan A/R), standard placement approach, simplified sequential search algorithm, and Takewaki approach.

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Cable Vibrations in Cable-Stayed Bridges

10.2749/sed009 ◽

2007 ◽

Cited By ~ 4

Author(s):

Elsa de Sá Caetano

Keyword(s):

Passive Control ◽

Direct Action ◽

Case Reports ◽

Present Book ◽

Wind Vibration ◽

Wake Effects ◽

Comprehensive Survey ◽

Control Devices ◽

Cable Vibrations ◽

Cable Stayed Bridges

<p>The fifty years of experience of construction of cable-stayed bridges since their establishment as a new category among the classical types have brought an immense progress, ranging from design and conception to materials, analysis, construction, observation and retrofitting. The growing construction of cable-stayed bridges has also triggered researchers’ and designers’ attention to the problem of cable vibrations. Intensive research has been developed all over the world during the last two decades as a consequence of the numerous cases of cable vibrations exhibited by all types of cable-stayed bridges.<p>Despite the increased knowledge of the various vibration phenomena, most of the outcomes and research results have been published in journals and conference proceedings and scarce information is currently provided by the existing recommendations and codes. <p>The present book provides a comprehensive survey on the governing phenomena of cable vibration, both associated with direct action of wind and rain: buffeting, vortex-shedding, wake effects, rain-wind vibration; and resulting from the indirect excitation through anchorage oscillation: external and parametric excitation. Methodologies for assessment of the effects of those phenomena are presented and illustrated by practical examples. Control of cable vibrations is then discussed and state-of-art results on the design of passive control devices are presented. <p>The book is complemented with a series of case reports reflecting the practical approach shared by experienced designers and consultants: Yves Bournand (VSL International), Chris Geurts (TNO), Carl Hansvold (Johs. Holt), Allan Larsen (Cowi) and Randall Poston (WDP & Associates).

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Optimal Design of Passive and Active Control Systems in Seismic-excited Structures Using a New Modified TLBO

Periodica Polytechnica Civil Engineering ◽

10.3311/ppci.16507 ◽

2020 ◽

Author(s):

Saeed Hosseinaei ◽

Mohammad Reza Ghasemi ◽

Sadegh Etedali

Keyword(s):

Optimal Design ◽

Structural Control ◽

Passive Control ◽

Optimization Problems ◽

Optimization Algorithms ◽

Control Device ◽

Feedback Gain ◽

Active Structural Control ◽

Teaching Learning Based Optimization ◽

Teaching Learning

Vibration control devices have recently been used in structures subjected to wind and earthquake excitations. The optimal design problems of the passive control device and the feedback gain matrix of the controller for the seismic-excited structures are some attractive problems for researches to develop optimization algorithms with the advancement in terms of simplicity, accuracy, speed, and efficacy. In this paper, a new modified teaching–learning-based optimization (TLBO) algorithm, known as MTLBO, is proposed for the problems. For some benchmark optimization functions and constrained engineering problems, the validity, efficacy, and reliability of the MTLBO are firstly assessed and compared to other optimization algorithms in the literature. The undertaken statistical indicate that the MTLBO performs better and reliable than some other algorithms studied here. The performance of the MTLBO will then be explored for two passive and active structural control problems. It is concluded that the MTLBO algorithm is capable of giving better results than conventional TLBO. Hence, its utilization as a simple, fast, and powerful optimization tool to solve particular engineering optimization problems is recommended.

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