Design and Experimental Implementation of a Beam-Type Twin Dynamic Vibration Absorber for a Cantilevered Flexible Structure Carrying an Unbalanced Rotor: Numerical and Experimental Observations

Özer, Abdullah; Ghodsi, Mojtaba; Sekiguchi, Akio; Saleem, Ashraf; Al-Sabari, Mohammed Nasser

doi:10.1155/2015/154892

Cited by 5 publications

(1 citation statement)

References 28 publications

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“…In this control system, the TEC is switched ON as the temperature is more than 25 ºC. Based on the dynamic behavior, resonance frequency of the actuator [5,31] and model identification [32][33][34][35] of actuator, a Proportional-Integral (PI)…”

Section: Resultsmentioning

confidence: 99%

Elimination of thermal instability in precise positioning of Galfenol actuators

et al. 2016

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This paper presents a new method to eliminate deviation in positioning caused by coil's heat generation in magnetostrictive actuators. The advantages of the proposed system are compactness, high controllability and high reliability. The actuator package consists of Galfenol as active element and a magnification mechanism combined with a Peltier element or thermoelectric cooler (TEC). By using the temperature sensor, a thermoelectric cooler (TEC) is activated to reduce the temperature of the coil. However, the reduction of temperature by TEC alone is not enough to eliminate the error and controlling of applied voltage is also required. A simple PI controller for coil's current is combined with TEC and by reducing the temperature and current simultaneously, the positioning error is vanished completely.

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Section: Resultsmentioning

confidence: 99%

Elimination of thermal instability in precise positioning of Galfenol actuators

et al. 2016

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Development of Magnetostrictive Harvester for Unmanned Aerial Vehicles (UAV)

Ghodsi

Ziaiefar

Mohammadzaheri

et al. 2019

2019 1st International Conference on Unmanned Vehicle Systems-Oman (UVS)

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Re-designing strategy to enable a sub-system to function as a dynamic vibration absorber

Matsubara,

Takahashi,

Furuya

et al. 2024

Journal of Vibration and Control

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In the design of a typical dynamic absorber, the components corresponding to the dynamic vibration absorber (DVA) should be reduced to a lumped constant system model comprising a mass, spring, and damper. The equivalent mass and stiffness must be determined and linked to design coefficients. However, no studies on the dynamic design of a main structure (main system) and an attached DVA (sub-system) based on an FE model without constructing a reduced-order equivalent model with a few DOFs have been conducted. This study proposes a new method of extracting and simplifying the design of a sub-system to function as a DVA using the state of a finite element (FE) model. We established the relationship between the condition of the sub-system functioning as a DVA and the modal parameter of the entire system. According to a survey, the modal kinetic energies, which were calculated from the partial mass matrix and mode vectors, of the main system and sub-system are approximately equal. We used this relationship to redesign the sub-system. As the modal kinetic energy was used as a design index, the FE model could be redesigned without constructing an equivalent lumped parameter model consisting of two or three degrees of freedom (DOFs) as in the conventional DVA design. We demonstrated the relationship between the modal kinetic energies of the main system and sub-system when it functions as a DVA for a 2-DOF lumped mass model and discussed how to distinguish the sub-system from the entire system (multi-DOF system). Considerable improvement was found in re-designing at FE model, validating the proposed method. The proposed method can be used to redesign components that behave similarly to dynamic absorbers to effectively reduce vibration from the results of FE analysis, without modeling the system as a lumped constant system.

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Design and Experimental Implementation of a Beam-Type Twin Dynamic Vibration Absorber for a Cantilevered Flexible Structure Carrying an Unbalanced Rotor: Numerical and Experimental Observations

Cited by 5 publications

References 28 publications

Elimination of thermal instability in precise positioning of Galfenol actuators

Elimination of thermal instability in precise positioning of Galfenol actuators

Development of Magnetostrictive Harvester for Unmanned Aerial Vehicles (UAV)

Re-designing strategy to enable a sub-system to function as a dynamic vibration absorber

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