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Research Papers

Optimization of a High-Speed Deployment Slider–Crank Mechanism: A Design Charts Approach

[+] Author and Article Information
Lorenzo Mariti

Department of Mechanical and
Aerospace Engineering,
West Virginia University,
Morgantown, WV 26506
e-mail: mariti@ing.uniroma2.it

Victor H. Mucino

Professor
Department of Mechanical and
Aerospace Engineering,
West Virginia University,
Morgantown, WV 26506
e-mail: victor.mucino@mail.wvu.edu

Ettore Pennestrí

Professor
Department of Industrial Engineering,
University of Rome “Tor Vergata”,
Rome, Italy
e-mail: pennestri@mec.uniroma2.it

Andres Cavezza

Department of Mechanical and
Aerospace Engineering,
West Virginia University,
Morgantown, WV 25606
e-mail: acavezza@mix.wvu.edu

Mridul Gautam

Professor
Department of Mechanical and
Aerospace Engineering,
West Virginia University,
Morgantown, WV 26506
e-mail: mgautam@mail.wvu.edu

Pier Paolo Valentini

Assistant Professor
Department of Industrial Engineering,
University of Rome “Tor Vergata”,
Rome, Italy
e-mail: valentini@ing.uniroma2.it

Equations (10) and (11) are valid for A.S. 5 music wire but their deduction procedure is general and can be applied to other materials.

The reader should pay attention to avoid lock–up or bifurcation positions during the deployment phase for the case of λ > 1.

Contributed by the Mechanisms and Robotics Committee of ASME for publication in the JOURNAL OF MECHANICAL DESIGN. Manuscript received July 5, 2012; final manuscript received September 15, 2013; published online April 28, 2014. Assoc. Editor: Oscar Altuzarra.

J. Mech. Des 136(7), 071004 (Apr 28, 2014) (7 pages) Paper No: MD-12-1345; doi: 10.1115/1.4025702 History: Received July 05, 2012; Revised September 15, 2013

Mechanical and aerospace applications often require that mechanisms deploy in a quick stable and reliable way. The objective of this study is to implement a general optimization procedure to perform a first stage conceptual design of HSD mechanisms, focusing on both kinematics and dynamics. In particular, the authors will focus on the development of design charts. In the very first part of the work, a parametric lumped-mass system will be modeled in order to reduce the number of parameters for the synthesis phase. A correlation will be established between geometry, inertia and initial position to guarantee the maximum value of acceleration during deployment of the deployable arm by means of the principle of virtual work. In the second part of this work, the influence of important factors such as friction and joint clearance on the overall dynamics of the system will be investigated. Finally, a coupled dynamic and structural analysis of the helical spring, that actuates the mechanism, will be carried out in order to achieve optimal performance. The developed charts will also take into account the space limitation requirement, that are often needed for both aerospace and mechanical applications. A final example will summarize all the points covered by this research effort. Results will be validated using the commercial software ABAQUS.

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References

Figures

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Fig. 1

Scheme of the Slider–Crank mechanism under analysis

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Fig. 3

Slider position and frame of reference

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Fig. 4

Planar model of clearance and friction in a cylindrical joint

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Fig. 6

Initial angle values which corresponds to a maximum value of angular acceleration: case λ < 1

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Fig. 7

Initial angle values which corresponds to a maximum value of angular acceleration: case λ > 1

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Fig. 8

Influence of friction on the revolute joints: stiffness value k = 1500 Nm

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Fig. 9

Influence of friction on the revolute joints: detailed view

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Fig. 10

FE model description

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