Flexural Vibration Control of the Circular Handlebars of a Bicycle by Using MFC Actuators

Ro, Jeng-Jong; Chien, Chin-Chie; Wei, Teng-Yu; Sun, Shuh-Jang

doi:10.1177/1077546307078740

Cited by 13 publications

(7 citation statements)

References 14 publications

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“…Compared with traditional materials, macro fibre composite (MFC) is a developed smart material, and more flexible. The MFC has been widely applied in various situations (11,12,13) . This new material is originally developed as a means of overcoming many of the practical difficulties associated with using monolithic piezoelectric actuators in structural control applications (14) .…”

Section: Introductionmentioning

confidence: 99%

The vibration suppression of solar panel based on smart structure

Tian

et al. 2020

Aeronaut. j.

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This paper provides a solution to the active vibration control of a microsatellite with two solar panels. At first, the microsatellite is processed as a finite element model containing a rigid body and two flexible bodies, according to the principles of mechanics, and that the dynamic characteristics are solved by modal analysis. Secondly, the equation involving vibration control is established according to the finite element calculation results. There are several actuators composed of macro fibre composite on the two solar panels for outputting control force. Furthermore, the control voltage for driving actuator is calculated by using fuzzy algorithm. It is clear that the smart structure consists of the flexible bodies and actuators. Finally, the closed-loop control simulation for suppressing harmful vibration is established. The simulation results illustrate that the responses to the external excitation are decreased significantly after adopting fuzzy control.

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Section: Introductionmentioning

confidence: 99%

The vibration suppression of solar panel based on smart structure

Tian

et al. 2020

Aeronaut. j.

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“…Among these, the electromechanically coupled piezoelectric materials possess immense potentials because of its dynamic characteristics (wider frequency band, large force) and their availability in different forms (bar, patch, composite, stack, etc.). Piezoelectric patches and composites such as Macrofibre Composite (MFC), Active Fibre Composite (AFC) are increasingly considered as actuators by research communities to address various vibration control-related problems in recent years [1][2][3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Finite Element Analysis and Vibration Control of a Deep Composite Cylindrical Shell Using MFC Actuators

Kumar

Raja

Prasanna

et al. 2012

Smart Materials Research

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A four-node composite facet-shell element is developed, accounting for electromechanical coupling of Macrofiber Composite (MFC) and conventional PZT patches. Further a warping correction is included in order to capture correctly the induced strain of conformable MFC, surface bonded on a cylindrical shell. The element performance to model the relations between in-plane electric field to normal strains is examined with the help of experiment and ANSYS analysis. In ANSYS, a simple modeling scheme is proposed for MFC using a parallel capacitors concept. The independent modal space control technique has been revisited to address the control of combination resonances through a selective modal space control scheme, where two or more modes can be combined to form the vibrating system or plant in modal domain. The developed control schemes are implemented in a digital processor using DS1104 and the closed-loop vibration control experiments are conducted on a CFRP shell structure. The influence of directionally induced actuation of MFC actuators on elastic couplings of composite shell is studied theoretically and is subsequently demonstrated in experiments. MFC actuators provide the much needed optimization domain for achieving the vibration control of combination resonances of elastically coupled deep-shell structure.

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“…MFC is extremely flexible, durable and has the advantage of higher electromechanical coupling coefficients due to the interdigitated electrodes. MFC has found many applications in actuation, vibration control, structural health monitoring and energy harvesting in recent years (Park and Kim 2004, Sodano et al 2004, Schönecker et al 2006, Ro et al 2007, Wu et al 2012.…”

Section: Macro-fiber Composites (Mfc)mentioning

confidence: 99%

Health monitoring of cylindrical structures using MFC transducers

Cui¹

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Wave propagation techniques are widely used in structural health monitoring (SHM) because of their easily recognizable and controllable characteristics. Using wave propagation in SHM, controllable ultrasonic stress waves activated in the structures that be distorted if there exist discontinuities like cracks, delaminations, and corrosions. The received signals are analyzed, and the discontinuities can be identified. In cylindrical structures such as pipelines, cracks are more likely to occur along the longitudinal (axial) direction, and they can be fatal to the serviceability of the structures. Unfortunately, the conventional ultrasonic crack detection methods which use longitudinal waves are not very sensitive to this type of cracks. The purpose of this research work is to find an appropriate SHM method for cylindrical structures by using surface attached piezoelectric macro-fiber composite (MFC) to generate guided wave in cylindrical structures. MFC transducers oriented at 45˚ against the neutral axis of the specimen are used as both actuator and sensor to generate longitudinal and torsional waves and to pick up the signals, respectively. Firstly, MFC generated torsional wave pack is used for the axially oriented crack growth monitoring of cylindrical structures. Numerical simulations are performed using ANSYS and nodal release method is used to model the progress of crack growth. Experimental studies are conducted to verify the simulation results. Root mean square deviation (RMSD) method is proposed to capture the slight amplitude changes between the signals collected from the specimen with different crack sizes. Both the numerical results and the experimental data suggest that the axial-direction crack propagation in cylindrical structures can be well monitored using this wave propagation approach. The proposed SHM system then extended with an additional piece of MFC transducer. The new system is not only able to pick up the axial crack growth but also able to identify the axial crack position in the cylindrical structure. The crack position is determined by the time of flight of the wave pack, while the crack propagation is monitored by measuring the variation in the crack induced disturbances, namely, the RMSD crack index. Both numerical simulations and experimental tests on aluminum pipes have been carried out for verification. The results demonstrated that the crack ABSTRACT IV position can be identified, and its growth can be well monitored with the proposed approach. Based on the same principle and experiment setup, the detection of crack size and orientation in the cylindrical structure are studied. First, a crack of finite size is induced in a laboratory specimen. Later, the size is gradually increased along various orientations. The effects of the crack size and transmitted waves, captured by the sensor, are correlated with the RMSD values of the torsional wave packs and the longitudinal wave packs. The results show that both size and orientation of the crack can be evaluated based on the proposed me...

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Flexural Vibration Control of the Circular Handlebars of a Bicycle by Using MFC Actuators

Cited by 13 publications

References 14 publications

The vibration suppression of solar panel based on smart structure

The vibration suppression of solar panel based on smart structure

Finite Element Analysis and Vibration Control of a Deep Composite Cylindrical Shell Using MFC Actuators

Health monitoring of cylindrical structures using MFC transducers

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