Active Suspension Method and Active Vibration Control of a Hoop Truss Structure

Ma, Guoliang; Gao, Bo; Xu, Minglong; Feng, Bo

doi:10.2514/1.j056746

Cited by 20 publications

(8 citation statements)

References 17 publications

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“…Typical representatives of passive dampers are viscoelastic dampers [4][5][6] and fluid viscous dampers (FVDs) [7]. The typical representative of active dampers is the voice coil damper [8]. The hybrid damper can combine the voice coil damper with other passive damping methods [3,9].…”

Section: Introductionmentioning

confidence: 99%

Research on nonlinear stiffness and damping of bellows-type fluid viscous damper

Jiao

Zhang²,

Yan

et al. 2021

Nonlinear Dyn

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Micro-vibrations in satellites mainly originate from the control moment gyroscope because of its mass imbalance, which seriously affect the image accuracy of high-resolution optical payload, so it must be isolated. Bellows-type fluid viscous damper (FVD) can be used to isolate micro-vibrations. In this paper, a simplified model of the damping element in bellowstype FVD under medium-and high-frequency excitation is proposed according to the concept of bellows effective area. Based on this theoretical model, nonlinear stiffness and damping at different design parameters are extracted by nonlinear fitting method. Then, the main cause of nonlinear stiffness and damping is analyzed by the velocity distribution in the cross section of damping orifice. The factors that affect the intensity of nonlinear stiffness and damping are discussed by using the flow resistance. The results show that the velocity term in the corrected hydraulic resistance is the cause of nonlinear damping and stiffness. Damping orifice diameter, length and silicone oil viscosity will affect the intensity of nonlinear characteristics of this damper. At low viscosity, the nonlinear damping is more obvious. The larger the diameter, the more obvious the nonlinear damping. In the frequency domain between 1 and 200 Hz, the velocity index is not a constant, but changes with frequency. Hydraulic stiffness can be divided by linear stiffness and nonlinear stiffness; both of them can affect the elastic force.

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Section: Introductionmentioning

confidence: 99%

Research on nonlinear stiffness and damping of bellows-type fluid viscous damper

Jiao

Zhang²,

Yan

et al. 2021

Nonlinear Dyn

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“…The actuator is a significant component of structural active vibration control. At present, many types of actuators are used to suppress the active vibrations of large flexible structures, including piezoelectric patches, 3,4 piezoelectric stacks, [5][6][7][8][9][10] voice coils, [11][12][13] air thrusters 14 and cables. 15,16 Piezoelectric stack actuators have advantages of wideband action, simplicity, reliability, compactness, portability, low power consumption and easy application.…”

Section: Introductionmentioning

confidence: 99%

Integral terminal sliding-mode robust vibration control of large space intelligent truss structures using a disturbance observer

Tian

Guo

2021

Proceedings of the Institution of Mechanical Engineers, Part G:

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This study aims to develop an advanced integral terminal sliding-mode robust control method using a disturbance observer (DO) to suppress the forced vibration of a large space intelligent truss structure (LSITS). First, the dynamics of the electromechanical coupling of the piezoelectric stack actuator and the LSITS, based on finite element and Lagrangian methods, are established. Subsequently, to constrict the vibration of the structure, a novel integral terminal sliding-mode control (ITSMC) law for the DO is used to estimate the parameter perturbation of the LSITS based on a continuous external disturbance. Simulation results show that, under a forced vibration and compared with the ITSMC system without a DO, the displacement amplitude of the ITSMC system with the DO is effectively reduced. In the case where the model parameters of the LSITS deviate by ±50%, and an unknown continuous external disturbance exists, the control system with the DO can adequately attenuate the structural vibration and realize robust control. Concurrently, the voltage of the employed piezoelectric stack actuator is reduced, and voltage jitter is alleviated.

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“…Planar trusses are one of the most commonly used structural forms [1,2]. One of the classical problems in their design and optimization is finding the optimal topology configuration as well as the optimal size.…”

Section: Introductionmentioning

confidence: 99%

Large-Scale Truss Topology and Sizing Optimization by an Improved Genetic Algorithm with Multipoint Approximation

Dong¹,

Chen²,

Han³

et al. 2021

Applied Sciences

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Truss size and topology optimization problems have recently been solved mainly by many different metaheuristic methods, and these methods usually require a large number of structural analyses due to their mechanism of population evolution. A branched multipoint approximation technique has been introduced to decrease the number of structural analyses by establishing approximate functions instead of the structural analyses in Genetic Algorithm (GA) when GA addresses continuous size variables and discrete topology variables. For large-scale trusses with a large number of design variables, an enormous change in topology variables in the GA causes a loss of approximation accuracy and then makes optimization convergence difficult. In this paper, a technique named the label–clip–splice method is proposed to improve the above hybrid method in regard to the above problem. It reduces the current search domain of GA gradually by clipping and splicing the labeled variables from chromosomes and optimizes the mixed-variables model efficiently with an approximation technique for large-scale trusses. Structural analysis of the proposed method is extremely reduced compared with these single metaheuristic methods. Numerical examples are presented to verify the efficacy and advantages of the proposed technique.

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Active Suspension Method and Active Vibration Control of a Hoop Truss Structure

Cited by 20 publications

References 17 publications

Research on nonlinear stiffness and damping of bellows-type fluid viscous damper

Research on nonlinear stiffness and damping of bellows-type fluid viscous damper

Integral terminal sliding-mode robust vibration control of large space intelligent truss structures using a disturbance observer

Large-Scale Truss Topology and Sizing Optimization by an Improved Genetic Algorithm with Multipoint Approximation

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