Parametric evaluation of deployable scissor arches

Mira, Lara Alegria; Coelho, Rajan Filomeno; Thrall, Ashley P.; Temmerman, Niels De

doi:10.1016/j.engstruct.2015.05.013

Cited by 24 publications

(17 citation statements)

References 14 publications

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“…To more easily fit the shape of the planar scissor mechanism in the specific deployed state, the VM is used to derive the constraint equation of the curve formed by the polar scissor unit. The planar scissor mechanism needs to satisfy the following three conditions in the specific deployed state: (1) concurrency and deployability constraints are met (19) between all scissor units; (2) the end-points of all scissor units on the same side coincide with the parabola, which is called curve constraints, as S 6 -S 10 in Figure 9(a); and (3) the two sets of scissor units at both ends of the planar scissor mechanism form a closed loop with the top and bottom rings, which needs to satisfy the deployability constraints of Eqs. (19) and (20).…”

Section: Planar Scissor Mechanismmentioning

confidence: 99%

“…Moreover, the two sets of scissor units at both ends of the planar scissor mechanism also need to satisfy the constraint Eqs. (19) and (20). The PDA composed of the planar scissor mechanism, top ring, and bottom ring can realize mobility and complete deployment under the above conditions.…”

Section: Planar Scissor Mechanismmentioning

confidence: 99%

“…Gao et al applied the scissor mechanism in robotics and designed a deployable manipulator for grasping objects with movement bifurcation [18]. Many structural parameters of the scissor mechanism were evaluated by Mira et al [19]. Arnoutsa et al [20] studied the geometric incompatibility in the development of bistable scissor structures.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Novel Surface Design of Deployable Reflector Antenna Based on Polar Scissor Structures

Zhao

Liu

et al. 2020

Chin. J. Mech. Eng.

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Space-deployable mechanisms can be used as supporting structures for large-diameter antennas in space engineering. This study proposes a novel method for constructing the surface design of space reflector antennas based on polar scissor units. The concurrency and deployability equations of the space scissor unit with definite surface constraints are derived using the rod and vector methods. Constraint equations of the spatial transformation for space n-edge polar scissor units are summarized. A new closed-loop deployable structure, called the polar scissor deployable antenna (PSDA), is designed by combining planar polar scissor units with spatial polar scissor units. The over-constrained problem is solved by releasing the curve constraint that locates at the end-point of the planar scissor mechanism. Kinematics simulation and error analysis are performed. The results show that the PSDA can effectively fit the paraboloid of revolution. Finally, deployment experiments verify the validity and feasibility of the proposed design method, which provides a new idea for the construction of large space-reflector antennas.

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Section: Planar Scissor Mechanismmentioning

confidence: 99%

Section: Planar Scissor Mechanismmentioning

confidence: 99%

See 1 more Smart Citation

Novel Surface Design of Deployable Reflector Antenna Based on Polar Scissor Structures

Zhao

Liu

et al. 2020

Chin. J. Mech. Eng.

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“…In addition, the structural analysis and verification modules are embedded within the optimization process performed by Matlab®. Matlab® has been previously used to control parametric finite-element software [34]. The program is subdivided into eight modules as Fig.…”

Section: Structural Analysis and Verificationmentioning

confidence: 99%

Multiobjective optimization of post-tensioned concrete box-girder road bridges considering cost, CO2 emissions, and safety

García-Segura

Piqueras

2016

Engineering Structures

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This paper presents a multiobjective optimization of post-tensioned concrete road bridges in terms of cost, CO2 emissions, and overall safety factor. A computer tool links the optimization modulus with a set of modules for the finite-element analysis and limit states verification. This is applied for the case study of a three-span continuous post-tensioned box-girder road bridge, located in a coastal region. A multiobjective harmony search is used to automatically search a set of optimum structural solutions regarding the geometry, concrete strength, reinforcing and post-tensioned steel. Diversification strategies are combined with intensification strategies to improve solution quality. Results indicate that cost and CO2 emissions are close to each other for any safety range. A one-euro reduction, involves a 2.34 kg CO2 emissions reduction. Output identifies the best variables to improve safety and the critical limit states. This tool also provides bridge managers with a set of trade-off optimum solutions, which balance their preferences most closely, and meet the requirements previously defined.

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“…In the area of optimization design for deployable mechanism, many research works have been conducted. 10–21 Zeng et al. 10 established a parameter optimization model of the bridge expanding device and bridge sections based on the virtual prototyping technology, the optimization design of the device is further carried out by the limit loads of hydraulic cylinders; however, it did not consider the practical situation of the difference between pushing force and pulling force.…”

Section: Introductionmentioning

confidence: 99%

An optimum design method for a new deployable mechanism in scissors bridge

Han

Zhu

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part C:

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In order to solve the existing problems of driving cylinder failures of a new deployable mechanism of scissors bridge in the process of an engineering prototype test, a multiobjective optimal model was proposed. The minimum cylinder pushing force and pulling force are taken as the optimization objective. The location of hinge points is taken as variables. Considering the unfolding of the scissor bridge as a quasi-static process, the kinematics model and statics model of the deployable mechanism were constructed using Denavit–Hatenberg homogeneous transformed matrix and mechanics equilibrium conditions, respectively. The proposed optimization strategy was employed based on Pareto optimum, and Pareto frontier was obtained by varying weight coefficient of multiobjective within interval around the required value. Using the trust region algorithm to solve optimization model, a reasonable solution was chosen from Pareto frontier. The results showed that the force conditions of the hydraulic cylinder, key hinge points and linkage in the deployable mechanism were significantly improved through a comparative study between initial design and optimized design for the engineering prototype. The research has shown that the optimization method has quick convergence speed and steady performance. The correctness of the optimal model and mechanics model was proved by ADAMS simulation. This passage provides new ideas and solutions for the force optimization of deployable mechanism of engineering prototype.

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Parametric evaluation of deployable scissor arches

Cited by 24 publications

References 14 publications

Novel Surface Design of Deployable Reflector Antenna Based on Polar Scissor Structures

Novel Surface Design of Deployable Reflector Antenna Based on Polar Scissor Structures

Multiobjective optimization of post-tensioned concrete box-girder road bridges considering cost, CO2 emissions, and safety

An optimum design method for a new deployable mechanism in scissors bridge

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