Structural Dynamics Model of Multisegmented Folding Wings: Theory and Experiment

Wang, Ivan; Dowell, Earl H.

doi:10.2514/1.c031509

Cited by 12 publications

(4 citation statements)

References 8 publications

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“…Over the past few decades, with the development of digital technology, origami techniques have attracted extensive research in the field of mathematics as well as in many areas of engineering, such as expandable and retractable wings [12], energy absorbing devices [13] and DNA folding [14]. Origami techniques adopts advanced methods [15] such as 3D prototype modeling, Unity graphics, animation playback, and geometry.…”

Section: Introductionmentioning

confidence: 99%

A Method for Design and Optimization of Digital Origami Based on DAG Model

2023

CADandA

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Origami is to transform a flat square sheet of paper into a finished sculpture through folding and sculpting techniques. It is widely used in many fields such as traditional art, furniture design, solar panels and medical devices. To address the problems of complex configuration of origami, uneasy folding, and the difficult process of establishing origami model, this paper proposes a digital origami representation and design optimization method with DAG (Directed Acyclic Graph) model and directional plane. Firstly, the DAG model is constructed, whose nodes and branches represent the paper states and folding behaviors respectively. Secondly, the constraint relations are defined and established between the point-line-surface geometric elements and the folding behaviors, making it feasible to conform to the paper folding process. Lastly, combined with DAG model, the folding design process, including similar folding, reasonable folding and fewer folding operations, can be optimized to improve the computational efficiency. The method provides a digital theory for origami and is validated and tested by the software Unity3d.

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Section: Introductionmentioning

confidence: 99%

A Method for Design and Optimization of Digital Origami Based on DAG Model

2023

CADandA

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“…The morphing wings generally have a variable shape or structure. According to their morphing strategies and objectives, morphing wings are classified into different categories, mainly involving variable camber (Pendleton et al, 2000), variable thickness (Popov et al, 2010), twist morphing (Raither et al, 2013), span morphing (Vale et al, 2011), variable sweep (Powers et al, 1992) and folding wing (Wang and Dowell, 2011). From smaller air vehicles to larger unmanned aerial vehicles and human-powered hang gliders, many attempts have been made to improve the vehicle performance using concepts found in nature.…”

Section: Introductionmentioning

confidence: 99%

Glide performance analysis of underwater glider with sweep wings inspired by swift

Wang

Yang

et al. 2022

Front. Mar. Sci.

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Underwater glider (UG) is one of the most promising autonomous observation platforms for long-term ocean observation, which can glide through seawater columns by adjusting its buoyancy and attitude. Hydrodynamic shape, especially the wing parameters, has an important influence on the glide performance of UG. In this paper, a sweep wing strategy inspired by the swift wings is proposed to apply pre-adjustable sweep wings for UGs, so as to improve the glide performance in different glide conditions. The approximate model that describes the relationship between the hydrodynamic coefficients of UG and the wing sweep angles is established with computational fluid dynamics method. By importing the approximate models into the dynamic model, the glide performance analysis, including endurance ability and trajectory accuracy, is performed to analyze the effect of the various sweep wings. The analysis results indicate that different sweep angles of wings are required by UG to obtain the optimal ability in gliding range, gliding duration, turn and resisting current, and the sweep wing strategy is useful for UG to improve its performance in observation mission due to the uncertainty of ocean environment.

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“…The results show that the designed deployable mechanism could satisfy the requirements [11]. Based on the aerodynamic instability and beam theory, Wang et al established an aeroelastic model of a torsional spring folding wing, and a theoretical method was proposed to predict the natural and flutter frequency in different segments at various angles under diverse aerodynamic conditions [12,13]. With the help of finite element software, Coffin et al analyzed the dynamic characteristics of the link folding wing.…”

Section: Introductionmentioning

confidence: 99%

Reliability Evaluation for Cable-Spring Folding Wing Considering Synchronization of Deployable Mechanism

Gao

Zhou

et al. 2021

Actuators

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The cable-spring folding wing is a novel type of rigid-flexible coupling structure for missiles, which is composed of several sets of deployable mechanisms, with each composed of a wheel-rope transmission system and a parallel spring driving mechanism. The movement of the cable is initiated by the driving force produced by parallel springs, which directly changes the magnitude and the distribution of the driving force. Therefore, the cable-spring folding wing system has the typical characteristics of strong nonlinearity and motion coupling. In addition, each deployable mechanism shares an identical structure, but the distribution of motion parameters is discrepant due to external loads. Asynchronous movement of the cable-spring folding wing will occur and become a significant issue, which is detrimental to the working performance and could even lead to failure. Focusing on these problems, the multi-body dynamics theoretical model and simulation model of deployable mechanism are established, the kinematic and dynamic characteristics of critical components are studied, and the key factors affecting the deployment performance are investigated. A new reliability method with an angular precision control for deployable mechanism is proposed based on the theoretical model. The effectiveness of the proposed model and method is verified by comparing it with the Monte Carlo method. On this basis, the reliability evaluation for cable-spring folding wing, comprehensively considering deployment performance and synchronization, is carried out.

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Structural Dynamics Model of Multisegmented Folding Wings: Theory and Experiment

Cited by 12 publications

References 8 publications

A Method for Design and Optimization of Digital Origami Based on DAG Model

A Method for Design and Optimization of Digital Origami Based on DAG Model

Glide performance analysis of underwater glider with sweep wings inspired by swift

Reliability Evaluation for Cable-Spring Folding Wing Considering Synchronization of Deployable Mechanism

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