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Wei, J., Yu, J., Tan, H., Wang, W. & Eriksson, A. (2020). Design and testing of inflatable gravity-gradient booms in space. CEAS Space Journal, 12(1), 33-41
Open this publication in new window or tab >>Design and testing of inflatable gravity-gradient booms in space
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2020 (English)In: CEAS Space Journal, ISSN 1868-2502, E-ISSN 1868-2510, Vol. 12, no 1, p. 33-41Article in journal (Refereed) Published
Abstract [en]

Inflatable space structures have many advantages such as small size, high reliability, and low cost. Aiming at a gravity-gradient boom for an XY-1 satellite, New Technology Verifying Satellite-1, a slender inflatable boom with low magnetic is presented. First of all, an inflatable boom with six self-supporting thin shells made of carbon and Vectran fiber composite materials on the inner wall was designed for eliminating a magnetic dipole moment and increasing structural stiffness. A precise stowage was designed for a tip mass surrounded by a pair of lightweight honeycomb blocks added on the top of the boom. The stowed boom was tested by sine sweep vibrations with three directions on the ground to verify the reasonable design. The XY-1 satellite which carried the inflatable boom was launched into low orbit. After being stowed state in space for at least 6 months, the inflatable boom orderly unfolded a 2.0 kg tip mass to 3.0 m away in May, 2013. The inflatable boom was successfully deployed from a series of photographs received on the satellite. The results show that this kind of lightweight inflatable boom with self-supporting thin shells can orderly unfold and fulfil the function of gravity-gradient in space for a long time.

Place, publisher, year, edition, pages
SPRINGER WIEN, 2020
Keywords
Inflatable booms, Self-surpporting thin-shells, Deployable, Vibration
National Category
Mechanical Engineering
Identifiers
urn:nbn:se:kth:diva-269048 (URN)10.1007/s12567-019-00256-w (DOI)000512094900003 ()2-s2.0-85066471469 (Scopus ID)
Note

QC 20200310

Available from: 2020-03-10 Created: 2020-03-10 Last updated: 2020-03-10Bibliographically approved
Kazemzadeh, A., Eriksson, A., Madou, M. & Russom, A. (2019). A micro-dispenser for long-term storage and controlled release of liquids. Nature Communications, 10(1), Article ID 189.
Open this publication in new window or tab >>A micro-dispenser for long-term storage and controlled release of liquids
2019 (English)In: Nature Communications, ISSN 2041-1723, E-ISSN 2041-1723, Vol. 10, no 1, article id 189Article in journal (Refereed) Published
Abstract [en]

The success of lab-on-a-chip systems may depend on a low-cost device that incorporates on-chip storage and fluidic operations. To date many different methods have been developed that cope separately with on-chip storage and fluidic operations e. g., hydrophobic and capillary valves pneumatic pumping and blister storage packages. The blister packages seem difficult to miniaturize and none of the existing liquid handling techniques despite their variety are capable of proportional repeatable dispensing. We report here on an inexpensive robust and scalable micro-dispenser that incorporates long-term storage and aliquoting of reagents on different microfluidics platforms. It provides long-term shelf-life for different liquids enables precise dispensing on lab-on-a-disc platforms and less accurate but proportional dispensing when operated by finger pressure. Based on this technology we introduce a method for automation of blood plasma separation and multi-step bioassay procedures. This micro-dispenser intends to facilitate affordable portable diagnostic devices and accelerate the commercialization of lab-on-a-chip devices.

Place, publisher, year, edition, pages
Nature Publishing Group, 2019
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-242976 (URN)10.1038/s41467-018-08091-z (DOI)000455595400012 ()30643146 (PubMedID)2-s2.0-85060061742 (Scopus ID)
Funder
Science for Life Laboratory - a national resource center for high-throughput molecular bioscience
Note

QC 20190201

Available from: 2019-02-01 Created: 2019-02-01 Last updated: 2019-02-01Bibliographically approved
Eriksson, A. & Nordmark, A. (2019). Constrained stability of conservative static equilibrium. Computational Mechanics, 64(4), 1199-1219
Open this publication in new window or tab >>Constrained stability of conservative static equilibrium
2019 (English)In: Computational Mechanics, ISSN 0178-7675, E-ISSN 1432-0924, Vol. 64, no 4, p. 1199-1219Article in journal (Refereed) Published
Abstract [en]

Modelling of static structural stability problems is considered. Focus is set on problems where passive physical constraints affect the response to applied forces, and where more than one free parameter describes the setting. The existence of vibration frequencies at equilibrium states is investigated, as an indication of stability. The relevant Jacobian matrix is developed, with an emphasis on the necessity to formulate the constraint equations from an energy form in a conservative problem. The corresponding mass matrix is introduced, with zero mass contribution from constraint equations. Three different forms of the relevant Jacobians are considered, and alternative methods for the eigenvalue extraction given. Stability is discussed in a context of generalized equilibrium problems, where auxiliary parameters and equations can be included in a continuation setting. Examples show the formulation, implementation and interpretation of stability.

Place, publisher, year, edition, pages
SPRINGER, 2019
Keywords
Stability, Physical constraints, Parameterized model, Eigenvalue extraction, Equilibrium sequences
National Category
Applied Mechanics
Identifiers
urn:nbn:se:kth:diva-261292 (URN)10.1007/s00466-019-01700-8 (DOI)000485928100015 ()2-s2.0-85064249818 (Scopus ID)
Note

QC 20191008

Available from: 2019-10-08 Created: 2019-10-08 Last updated: 2019-10-08Bibliographically approved
Faroughi, S., Shafei, E. & Eriksson, A. (2019). NURBS-based modeling of laminated composite beams with isogeometric displacement-only theory. Composites Part B: Engineering, 162, 89-102
Open this publication in new window or tab >>NURBS-based modeling of laminated composite beams with isogeometric displacement-only theory
2019 (English)In: Composites Part B: Engineering, ISSN 1359-8368, E-ISSN 1879-1069, Vol. 162, p. 89-102Article in journal (Refereed) Published
Abstract [en]

This paper develops a formulation for displacement-only beam elements based on isogeometric analysis, with intended application to laminated composite members. The main purpose of the current study was to overcome some deficiencies of commonly used beam theories, such as shear-locking, the lacking relevance of isotropic materials for multi-layer composites, the incompatibility with other continuum elements, and the limited continuity in interpolation. A bi-variable non-uniform rational B-spline (NURBS) beam element with complete plane-stress elasticity terms and geometrical expressions was developed. Shear-locking, interlaminar stresses, the deep-beam situation, and vibration features were evaluated for several aspect ratios, ply orientations, and NURBS degrees, in order to verify the efficiency and accuracy. h-, p- and k-refinements were used to improve the displacement field. The validity of the solutions was measured based on results from plane-stress finite element analysis, and compared to the alternative Carrera unified formulation. Results show that the isogeometric displacement-only beam theory can provide the interlaminar stress distribution, gives high accuracy for mid and high-range eigen-frequencies, and avoids the shear-locking phenomenon.

Place, publisher, year, edition, pages
Elsevier, 2019
Keywords
Displacement-only beam, Free vibration, Interlaminar stresses, Isogeometric analysis, Laminated composite, NURBS
National Category
Metallurgy and Metallic Materials
Identifiers
urn:nbn:se:kth:diva-246473 (URN)10.1016/j.compositesb.2018.10.073 (DOI)000460193400010 ()2-s2.0-85055884331 (Scopus ID)
Note

QC 20190321

Available from: 2019-03-21 Created: 2019-03-21 Last updated: 2019-03-27Bibliographically approved
Ahmed, S., Minchot, G., Eriksson, A., King, F. & Hallgren, M. (2019). Post-Tensioned Stress Ribbon Systems in Long Span Roofs. In: 20th Congress of IABSE, New York City 2019: The Evolving Metropolis - Report2019. Paper presented at 20th IABSE Congress, New York City 2019: The Evolving Metropolis; New York City; United States; 4 September 2019 through 6 September 2019 (pp. 534-540). International Association for Bridge and Structural Engineering
Open this publication in new window or tab >>Post-Tensioned Stress Ribbon Systems in Long Span Roofs
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2019 (English)In: 20th Congress of IABSE, New York City 2019: The Evolving Metropolis - Report2019, International Association for Bridge and Structural Engineering , 2019, p. 534-540Conference paper, Published paper (Refereed)
Abstract [en]

Cable systems have numerous advantages, such as: large column-free areas, and reduced materials consumption, which reduces the load and the cost. Nevertheless, they are rarely used in long span roofs due to large deflections, and the insufficient space for end supports, or/and back-stayed cables. This work suggests the use of post-tension stress ribbon system in long span roofs in order to reduce the pull-out forces, deflections and concrete stresses compared to a conventional cable system. A comparison is carried out through meticulous and accurate finite element simulations, using SAP2000, implemented for the new +200m roof of Västerås Travel Center (Sweden), which will become one of the longest cable suspended roofs in the world, if not the longest. Results confirm the suitability and superiority of stress ribbon systems as it reduces concrete stresses, deflections, pull-out forces and vertical reactions. These reductions are found highly correlated to the applied prestressing forces.

Place, publisher, year, edition, pages
International Association for Bridge and Structural Engineering, 2019
Keywords
cable suspended, stress ribbon, roof structure, post-tensioned concrete, SAP2000
National Category
Other Civil Engineering
Research subject
Civil and Architectural Engineering, Concrete Structures
Identifiers
urn:nbn:se:kth:diva-260978 (URN)2-s2.0-85074450896 (Scopus ID)9783857481659 (ISBN)
Conference
20th IABSE Congress, New York City 2019: The Evolving Metropolis; New York City; United States; 4 September 2019 through 6 September 2019
Note

QC 20191115

Available from: 2019-10-01 Created: 2019-10-01 Last updated: 2019-11-15Bibliographically approved
Swarén, M. & Eriksson, A. (2019). Power and pacing calculations based on real-time locating data from a cross-country skiing sprint race. Sports Biomechanics, 18(2), 190-201
Open this publication in new window or tab >>Power and pacing calculations based on real-time locating data from a cross-country skiing sprint race
2019 (English)In: Sports Biomechanics, ISSN 1476-3141, E-ISSN 1752-6116, Vol. 18, no 2, p. 190-201Article in journal (Refereed) Published
Abstract [en]

Pacing strategies in cross-country skiing have been investigated in several studies. However, none of the previous studies have been verified by collected skiing data giving the skiing velocities along a measured track. These can be used to calculate the propulsive power output. Collected real-time positioning data from a cross-country sprint skiing race were used to estimate the propulsive power by applying a power balance model. Analyses were made for the time-trial and the final for one female and one male skier. The average propulsive power over the whole race times were 311 and 296 W during the time trial and 400 and 386 W during the final, for the female and male skier, respectively. Compared to the average propulsive power over the whole race, the average active propulsive phases were calculated as 33 and 44% higher in the time trials and 36 and 37% higher in the finals for the female and male, respectively. The current study presents a novel approach to use real-time positioning data to estimate continuous propulsive power during cross-country sprint skiing, enabling in-depth analyses of power output and pacing strategies.

Place, publisher, year, edition, pages
Routledge, 2019
Keywords
Pacing strategies, propulsive power, performance analysis
National Category
Sport and Fitness Sciences
Identifiers
urn:nbn:se:kth:diva-251720 (URN)10.1080/14763141.2017.1391323 (DOI)000466583100006 ()29141496 (PubMedID)2-s2.0-85034210526 (Scopus ID)
Note

QC 20190521

Available from: 2019-05-21 Created: 2019-05-21 Last updated: 2019-05-29Bibliographically approved
Zhang, J., Guo, H.-W. -., Wu, J., Gao, G.-J. -., Kou, Z.-M. -. & Eriksson, A. (2018). Design and analysis of flexure revolute joint based on four-bar mechanism. Acta Astronautica, 151, 420-431
Open this publication in new window or tab >>Design and analysis of flexure revolute joint based on four-bar mechanism
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2018 (English)In: Acta Astronautica, ISSN 0094-5765, E-ISSN 1879-2030, Vol. 151, p. 420-431Article in journal (Refereed) Published
Abstract [en]

In order to avoid the stress concentration and increase rotational angle of a flexure joint, the method of partial separation of storage elements in the motion transmission elements is proposed. A type of flexure revolute joint with large rotational angle is designed based on the block approach. By setting a 4-bar mechanism as the intermediate block which connects the outer ring and the inner ring of the revolute joint, and replacing the rigid bar by a flexible beam, large rotational angles of the joint can be achieved. The basic size of the joint is designed by setting the initial and the constraint condition of the 4-bar mechanism. Then, influence analyses of the size of the linkage joint and large flexible beam on the stress, the torque, and the torsional stiffness are conducted by using nonlinear static analysis method. Based on the requirements for torque and rotational stiffness, the size of the flexure revolute joint is defined. Experiments on the joint, which can rotate 90° are conducted. 

Place, publisher, year, edition, pages
Elsevier, 2018
Keywords
Block approach, Deployable structure, Flexure revolute joint, Four-bar mechanism, Bars (metal), Flexible structures, Stiffness, Constraint conditions, Design and analysis, Four-bar mechanisms, Nonlinear static analysis methods, Revolute joints, Rotational stiffness, Mechanisms
National Category
Mechanical Engineering
Identifiers
urn:nbn:se:kth:diva-236642 (URN)10.1016/j.actaastro.2018.06.046 (DOI)000449246400043 ()2-s2.0-85049513465 (Scopus ID)
Note

QC 20181126

Available from: 2018-11-13 Created: 2018-11-13 Last updated: 2018-11-26Bibliographically approved
Wei, J., Ma, R., Liu, Y., Yu, J., Eriksson, A. & Tan, H. (2018). Modal analysis and identification of deployable membrane structures. Acta Astronautica, 152, 811-822
Open this publication in new window or tab >>Modal analysis and identification of deployable membrane structures
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2018 (English)In: Acta Astronautica, ISSN 0094-5765, E-ISSN 1879-2030, Vol. 152, p. 811-822Article in journal (Refereed) Published
Abstract [en]

The development of ultra-lightweight sails presents many challenges due to their large size and extreme flexibility. One of their key technologies is the design of deployable booms, in particular how to deploy and support the membrane structure. In this paper, a deployable sail with four triangular membranes supported by inflated booms enhanced by four self-supporting thin shells inside and Velcro outside is presented. The feasibility of the folding and unfolding processes is demonstrated, and their modal properties investigated. Firstly, the pressure variation and acceleration time history of a single boom during unfolding process were obtained by dynamic testing system, a finite element model of boom was proposed and structural natural frequencies by simulation were validated by experimental testing. Further, an 8.0 x 8.0 m(2) prototype was assembled and stowed in a Phi 700 mm by 300 mm container, and the structure was fully deployed with gas control. A finite element model of a combination of inflatable booms and triangular membranes was used to predict the structural overall bending modes. The effect of membrane wrinkling was simulated and controlled to improve membrane precision. This work validated the concept of deployable membrane structural design. The proposed finite element models were verified by experimental testing to be useful for membrane structure analysis.

Place, publisher, year, edition, pages
Elsevier, 2018
Keywords
Inflation, Membrane sail, Deployment, Modal analysis, Boom
National Category
Aerospace Engineering
Identifiers
urn:nbn:se:kth:diva-239487 (URN)10.1016/j.actaastro.2018.09.024 (DOI)000449235500079 ()2-s2.0-85054423887 (Scopus ID)
Note

QC 20181127

Available from: 2018-11-27 Created: 2018-11-27 Last updated: 2019-03-18Bibliographically approved
Xie, M., Gol'din, P., Estsfa, J., Li, L., Linares Arregui, I., Gasser, T. C., . . . Chagin, A. (2017). Evolutional Separation of Epiphyseal and Articular Cartilage is a Bone Adaptation to Terrestrial Growth. Paper presented at Annual Meeting of the American-Society-for-Bone-and-Mineral-Research (ASBMR), SEP 08-11, 2017, Denver, CO. Journal of Bone and Mineral Research, 32, S328-S328
Open this publication in new window or tab >>Evolutional Separation of Epiphyseal and Articular Cartilage is a Bone Adaptation to Terrestrial Growth
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2017 (English)In: Journal of Bone and Mineral Research, ISSN 0884-0431, E-ISSN 1523-4681, Vol. 32, p. S328-S328Article in journal, Meeting abstract (Other academic) Published
Place, publisher, year, edition, pages
Wiley, 2017
National Category
Orthopaedics
Identifiers
urn:nbn:se:kth:diva-243551 (URN)000418869203250 ()
Conference
Annual Meeting of the American-Society-for-Bone-and-Mineral-Research (ASBMR), SEP 08-11, 2017, Denver, CO
Note

QC 20190207

Available from: 2019-02-07 Created: 2019-02-07 Last updated: 2019-02-07Bibliographically approved
Zhou, Y., Nordmark, A. & Eriksson, A. (2017). Instability investigation for rotating thin spherical membrane. International Journal of Non-Linear Mechanics, 97, 96-106
Open this publication in new window or tab >>Instability investigation for rotating thin spherical membrane
2017 (English)In: International Journal of Non-Linear Mechanics, ISSN 0020-7462, E-ISSN 1878-5638, Vol. 97, p. 96-106Article in journal (Refereed) Published
Abstract [en]

A fluid-filled truncated spherical membrane fixed along its truncated edge to a horizontal, rigid and frictionless plane and spinning around a center axis was investigated. A two-parameter Mooney-Rivlin model was used to describe the material of the membrane. The truncated sphere was modeled in 3D using finite element meshes with different symmetry properties. A quadratic function was used for interpolating hydro-static pressure, giving a symmetric tangent stiffness matrix, thereby reproducing the conservative problem. Various problem settings were considered, related to the spinning, and different instability behaviors were observed. Multi-parametric problems were defined, generalized paths including primary and secondary paths were followed. Stability of the multi parametric problem was evaluated using generalized eigenvalue analysis based on the total differential matrix for the constrained problem. Numerical results showed that mesh symmetry affected the simulated stability behavior. Fold line evaluations showed the parametric effects on critical solutions.

National Category
Mechanical Engineering
Identifiers
urn:nbn:se:kth:diva-218202 (URN)10.1016/j.ijnonlinmec.2017.09.004 (DOI)000414878100009 ()2-s2.0-85029698165 (Scopus ID)
Note

QC 20171130

Available from: 2017-11-30 Created: 2017-11-30 Last updated: 2017-11-30Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-5819-4544

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