Nonlinear self-defined truss element based on the plane truss structure with flexible connector

Luo, Yajun; Xu, Minglong; Zhang, Xinong

doi:10.1016/j.cnsns.2009.11.006

Cited by 7 publications

(3 citation statements)

References 15 publications

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“…Hence, those traditional control methodologies that are based on accurate dynamic model are not suitable for LSITS. Fuzzy control methodologies are robust and do not need a particularly precise dynamic model [7][8][9]. Marinaki et al applied a fuzzy controller optimized by PSO for the vibration suppression of beams [10].…”

Section: Introductionmentioning

confidence: 99%

Placement optimization of actuator and sensor and decentralized adaptive fuzzy vibration control for large space intelligent truss structure

Liu

Jiang

et al. 2011

Sci. China Technol. Sci.

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Large space truss structure is widely used in spacecrafts. The vibration of this kind of structure will cause some serious problems. For instance, it will disturb the work of the payloads which are supported on the truss, even worse, it will deactivate the spacecrafts. Therefore, it is highly in need of executing vibration control for large space truss structure. Large space intelligent truss system (LSITS) is not a normal truss structure but a complex truss system consisting of common rods and active rods, and there are at least one actuator and one sensor in each active rod. One of the key points in the vibration control for LSITS is the location assignment of actuators and sensors. The positions of actuators and sensors will directly determine the properties of the control system, such as stability, controllability, observability, etc. In this paper, placement optimization of actuators and sensors (POAS) and decentralized adaptive fuzzy control methods are presented to solve the vibration control problem. The electro-mechanical coupled equations of the active rod are established, and the optimization criterion which does not depend upon control methods is proposed. The optimal positions of actuators and sensors in LSITS are obtained by using genetic algorithm (GA). Furthermore, the decentralized adaptive fuzzy vibration controller is designed to control LSITS. The LSITS dynamic equations with considering those remaining modes are derived. The adaptive fuzzy control scheme is improved via sliding control method. One T-typed truss structure is taken as an example and a demonstration experiment is carried out. The experimental results show that the GA is reliable and valid for placement optimization of actuators and sensors, and the adaptive fuzzy controller can effectively suppress the vibration of LSITS without control spillovers and observation spillovers.large space intelligent truss system, placement optimization of actuators and sensors, genetic algorithm, adaptive fuzzy control, decentralized control Citation:Li D X, Liu W, Jiang J P, et al. Placement optimization of actuator and sensor and decentralized adaptive fuzzy vibration control for large space intelligent truss structure.

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Section: Introductionmentioning

confidence: 99%

Placement optimization of actuator and sensor and decentralized adaptive fuzzy vibration control for large space intelligent truss structure

Liu

Jiang

et al. 2011

Sci. China Technol. Sci.

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“…The deployable structure in orbit manifests robust geometric nonlinearities and encompasses numerous revolute joints, yet limited research has been dedicated to its exploration. Moreover, as a typical discontinuous mechanical behavior, traditional finite element methods face challenges in modeling and solving [17] structures with clearance joints. Hence, there is an urgent need for an efficient numerical method tailored to structures with clearance.…”

Section: Introductionmentioning

confidence: 99%

A Study on the Effects of Clearance Joints on the Dynamic Response of a Planar Deployable Structure

Yao,

Liang,

et al. 2024

J. Phys.: Conf. Ser.

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This article investigates the influence of clearance joints on the dynamic characteristics of deployable structures and the contact characteristics inside clearance joints. An explicit dynamic modeling method is employed to formulate the governing equation of the structure, integrating the contact forces. Initially, a planar deployable structure is subjected to analysis to discern the effects of clearance joints. Subsequently, two distinct dynamic analyses are meticulously conducted to discern the nuanced effects of clearance size. The outcomes offer conclusive insights; clearance joints substantially influence dynamic responses and prolong the structure’s vibration period. The unrestrained motion of joints contributes to increased kinetic energy within the structure. Furthermore, a larger clearance size exacerbates these effects. In conclusion, the findings underscore the significant effects on the structure’s dynamic characteristics, which should be seriously taken into consideration in the design and modeling process. This necessitates meticulous consideration in designing and analyzing high-precision space structures to ensure accurate predictions and optimal performance.

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“…As a discontinuous mechanical behavior, the contact of clearance joints leads to many difficulties in modeling and solving in the traditional finite element method [30], particularly for the truss structure with clearance joints, which involves the frequent switch of contact modes. Therefore, a unified modeling principle is urgently needed to reduce the difficulty of modeling and improve the analysis efficiency.…”

Section: Introductionmentioning

confidence: 99%

A study on the effects of clearance joints on the dynamic response of the beam-joint structure using VFIFE

Yao

Liang

Zhang

et al. 2023

Preprint

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Joint clearance is unavoidable because it ensures successful assembly and deployment, but it also affects the dynamic response, stability, and pointing accuracy of large deployable space structures. This paper investigates the effects of clearance joints on the dynamic response of a beam-joint structure, a fundamental element of large deployable space structures. Vector form intrinsic finite element is employed to establish the structure’s motion governing equation to overcome the difficulties in modeling and solving of traditional finite element method led by contact behavior. The contact forces are modeled by the Lankarani and Nikravesh contact model and the modified Coulomb's friction model. First, a classical benchmark problem of a clamped-clamped beam is studied to validate the accuracy and efficiency of the model proposed. Then, a planar beam-joint structure with clearance joints is used to investigate the effects of clearance on the dynamic response. Subsequently, multiple simulation cases are executed to study the effects of different clearance factors on the dynamic structural characteristics. The results show that as the coefficient of restitution becomes small and the sliding friction coefficient gets large, more energy is dissipated, revealing their significant influence on the structural damping characteristics. Joint clearance enlarges the structure’s dynamic response, and larger clearance size and more clearance joints exacerbate these effects. The structure’s damping ratio becomes larger when the clearance size gets smaller. These results indicate that clearance joints have significant effects on the structure's dynamic characteristics, and they must be considered in the design and analysis of high-precision space structures.

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Nonlinear self-defined truss element based on the plane truss structure with flexible connector

Cited by 7 publications

References 15 publications

Placement optimization of actuator and sensor and decentralized adaptive fuzzy vibration control for large space intelligent truss structure

Placement optimization of actuator and sensor and decentralized adaptive fuzzy vibration control for large space intelligent truss structure

A Study on the Effects of Clearance Joints on the Dynamic Response of a Planar Deployable Structure

A study on the effects of clearance joints on the dynamic response of the beam-joint structure using VFIFE

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