Variable stiffness adaptive structures utilizing hydraulically pressurized flexible matrix composites with valve control

Michael Philen, Ying Shan, Charles E. Bakis, K. W. Wang, Christopher D. Rahn

Research output: Chapter in Book/Report/Conference proceedingConference contribution

50 Citations (Scopus)

Abstract

In this research, a novel variable stiffness adaptive structure idea is explored based on a biologically-inspired actuation system concept recently developed by the authors. The new actuation system, inspired by the fibrillar network in plant cell walls, is synthesized using flexible matrix composites (FMCs). By tailoring the fibers (orientation, number of layers, material, etc.) and selection of matrix materials, one can achieve FMC structures that have an exceptionally high degree of anisotropy, making them attractive for many applications. In this research, fluid-filled FMC tubes are first utilized to examine the concept. By taking advantage of the fiber reinforcement configuration and the high bulk modulus of the pressurizing fluid in the FMC tubes, significant changes in stiffness can be achieved by varying the inlet valve to the tubes. Thus, the variable stiffness adaptive structure has the flexibility to easily deform when desired (open valve), possesses the high stiffness required during loading conditions when deformation is not desired (closed valve - locked state), and has the adaptability to vary the stiffness between the open/closed states through valve control. In this study, a closed-form, linear, structure/fluid analytical model for a single FMC tube is first developed, and parameter studies are performed for evaluating the axial stiffness variation of the tube between the open and closed valve states. The results demonstrate that significant variations in axial structural stiffness can be achieved through valve control. Based upon the findings of the single tube analysis, an analytical model of a multi-cellular beam structure with multiple FMC tubes is developed. The performance of such a structure under different loading conditions for both open- and closed valve scenarios is examined. Through valve control, the analytical findings demonstrate that the bending rigidity of the multi-cellular FMC structure can also be significantly varied.

Original languageEnglish (US)
Title of host publicationCollection of Technical Papers - 47th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference
Subtitle of host publication14th AIAA/ASME/AHS Adaptive Structures Conference, 8th AIAA Non-deterministic App
Pages6387-6397
Number of pages11
StatePublished - Dec 1 2006
Event47th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference - Newport, RI, United States
Duration: May 1 2006May 4 2006

Publication series

NameCollection of Technical Papers - AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference
Volume9
ISSN (Print)0273-4508

Other

Other47th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference
CountryUnited States
CityNewport, RI
Period5/1/065/4/06

Fingerprint

Stiffness
Composite materials
Fiber reinforced materials
Composite structures
Fluids
Analytical models
Pressurization
Rigidity
Anisotropy
Elastic moduli

All Science Journal Classification (ASJC) codes

  • Architecture
  • Materials Science(all)
  • Aerospace Engineering
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Philen, M., Shan, Y., Bakis, C. E., Wang, K. W., & Rahn, C. D. (2006). Variable stiffness adaptive structures utilizing hydraulically pressurized flexible matrix composites with valve control. In Collection of Technical Papers - 47th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference: 14th AIAA/ASME/AHS Adaptive Structures Conference, 8th AIAA Non-deterministic App (pp. 6387-6397). (Collection of Technical Papers - AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference; Vol. 9).
Philen, Michael ; Shan, Ying ; Bakis, Charles E. ; Wang, K. W. ; Rahn, Christopher D. / Variable stiffness adaptive structures utilizing hydraulically pressurized flexible matrix composites with valve control. Collection of Technical Papers - 47th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference: 14th AIAA/ASME/AHS Adaptive Structures Conference, 8th AIAA Non-deterministic App. 2006. pp. 6387-6397 (Collection of Technical Papers - AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference).
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abstract = "In this research, a novel variable stiffness adaptive structure idea is explored based on a biologically-inspired actuation system concept recently developed by the authors. The new actuation system, inspired by the fibrillar network in plant cell walls, is synthesized using flexible matrix composites (FMCs). By tailoring the fibers (orientation, number of layers, material, etc.) and selection of matrix materials, one can achieve FMC structures that have an exceptionally high degree of anisotropy, making them attractive for many applications. In this research, fluid-filled FMC tubes are first utilized to examine the concept. By taking advantage of the fiber reinforcement configuration and the high bulk modulus of the pressurizing fluid in the FMC tubes, significant changes in stiffness can be achieved by varying the inlet valve to the tubes. Thus, the variable stiffness adaptive structure has the flexibility to easily deform when desired (open valve), possesses the high stiffness required during loading conditions when deformation is not desired (closed valve - locked state), and has the adaptability to vary the stiffness between the open/closed states through valve control. In this study, a closed-form, linear, structure/fluid analytical model for a single FMC tube is first developed, and parameter studies are performed for evaluating the axial stiffness variation of the tube between the open and closed valve states. The results demonstrate that significant variations in axial structural stiffness can be achieved through valve control. Based upon the findings of the single tube analysis, an analytical model of a multi-cellular beam structure with multiple FMC tubes is developed. The performance of such a structure under different loading conditions for both open- and closed valve scenarios is examined. Through valve control, the analytical findings demonstrate that the bending rigidity of the multi-cellular FMC structure can also be significantly varied.",
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Philen, M, Shan, Y, Bakis, CE, Wang, KW & Rahn, CD 2006, Variable stiffness adaptive structures utilizing hydraulically pressurized flexible matrix composites with valve control. in Collection of Technical Papers - 47th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference: 14th AIAA/ASME/AHS Adaptive Structures Conference, 8th AIAA Non-deterministic App. Collection of Technical Papers - AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference, vol. 9, pp. 6387-6397, 47th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference, Newport, RI, United States, 5/1/06.

Variable stiffness adaptive structures utilizing hydraulically pressurized flexible matrix composites with valve control. / Philen, Michael; Shan, Ying; Bakis, Charles E.; Wang, K. W.; Rahn, Christopher D.

Collection of Technical Papers - 47th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference: 14th AIAA/ASME/AHS Adaptive Structures Conference, 8th AIAA Non-deterministic App. 2006. p. 6387-6397 (Collection of Technical Papers - AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference; Vol. 9).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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AU - Philen, Michael

AU - Shan, Ying

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AU - Wang, K. W.

AU - Rahn, Christopher D.

PY - 2006/12/1

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N2 - In this research, a novel variable stiffness adaptive structure idea is explored based on a biologically-inspired actuation system concept recently developed by the authors. The new actuation system, inspired by the fibrillar network in plant cell walls, is synthesized using flexible matrix composites (FMCs). By tailoring the fibers (orientation, number of layers, material, etc.) and selection of matrix materials, one can achieve FMC structures that have an exceptionally high degree of anisotropy, making them attractive for many applications. In this research, fluid-filled FMC tubes are first utilized to examine the concept. By taking advantage of the fiber reinforcement configuration and the high bulk modulus of the pressurizing fluid in the FMC tubes, significant changes in stiffness can be achieved by varying the inlet valve to the tubes. Thus, the variable stiffness adaptive structure has the flexibility to easily deform when desired (open valve), possesses the high stiffness required during loading conditions when deformation is not desired (closed valve - locked state), and has the adaptability to vary the stiffness between the open/closed states through valve control. In this study, a closed-form, linear, structure/fluid analytical model for a single FMC tube is first developed, and parameter studies are performed for evaluating the axial stiffness variation of the tube between the open and closed valve states. The results demonstrate that significant variations in axial structural stiffness can be achieved through valve control. Based upon the findings of the single tube analysis, an analytical model of a multi-cellular beam structure with multiple FMC tubes is developed. The performance of such a structure under different loading conditions for both open- and closed valve scenarios is examined. Through valve control, the analytical findings demonstrate that the bending rigidity of the multi-cellular FMC structure can also be significantly varied.

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M3 - Conference contribution

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Philen M, Shan Y, Bakis CE, Wang KW, Rahn CD. Variable stiffness adaptive structures utilizing hydraulically pressurized flexible matrix composites with valve control. In Collection of Technical Papers - 47th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference: 14th AIAA/ASME/AHS Adaptive Structures Conference, 8th AIAA Non-deterministic App. 2006. p. 6387-6397. (Collection of Technical Papers - AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference).