| 1. |
- Matuk, Carlos
(författare)
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Dynamic stress in a towing wire due to forced acceleration
- 1981
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Ingår i: Journal of Aircraft. - : American Institute of Aeronautics and Astronautics (AIAA). - 0021-8669 .- 1533-3868. ; 18:6, s. 498-499
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Tidskriftsartikel (refereegranskat)abstract
- Dynamic stresses in a tow wire caused by accelerations of the towing vehicle are considered for the case of rectilinear motion. The diameter of the wire is small compared to the wavelengths of the dominant Fourier components of the elastic waves, and the internal friction of the wire is neglected so that the one-dimensional wave equation may apply. It is shown that damping occurs in the wire material and in the interactions between the wire and the surrounding medium, and that maximum static and dynamic stresses occur at the towing end of the wire.
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| 2. |
- Matuk, Carlos
(författare)
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Flight tests of tow wire forces while flying a racetrack pattern
- 1983
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Ingår i: Journal of Aircraft. - : American Institute of Aeronautics and Astronautics (AIAA). - 0021-8669 .- 1533-3868. ; 20:7, s. 623-627
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Tidskriftsartikel (refereegranskat)abstract
- Airplane towing of a target with a long wire in a racetrack pattern has been investigated. First the theoretical background is presented and then the experiments are treated. Twelve flights with different airplane speeds and turn radii are studied. The force at the airplane end of the wire, and the airplane and the target paths are plotted. The maximum force in the wire occurs after the airplane turn is finished. This maximum value is due to whip effect. The occurrence of maximum and minimum values for the vertical distance between airplane and target is demonstrated. The experimental results are compared with theoretical results for the conditions of the experiments. The overall agreement is considered satisfactory. Therefore theoretical graphs on the maximum force in the wire as a function of airplane speed and turn radius can be used to avoid wire failure while flying a racetrack pattern.
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| 3. |
- Matuk, Carlos
(författare)
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Impact damping and airplane towing : two studies of the response of solid bodies to transient loads
- 1982
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- The impact of a linearly elastic hammer on a linearly viscoelastic plate is the first problem considered in this thesis. The results, obtained by using the Laplace transformation method, can be used in the design of impact protection devices. The second problem considered is the towing of targets by wires during airplane accelerations in a straight path. The results, obtained by again applying the Laplace transformation method, can be used as conservative estimates to avoid failure of the wire. Towing of targets by wires during semi-circular airplane turns is the third problem considered. The results, which are obtained by applying the finite difference method, are checked through full-scale tests. These results can be used to predict the target path and to avoid wire failure during semi-circular turn manoeuvres.
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| 4. |
- Matuk, Carlos
(författare)
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Impact of a linearly elastic rod on a thin linearly viscoelastic target
- 1979
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Ingår i: Journal of Sound and Vibration. - 0022-460X .- 1095-8568. ; 64:1, s. 45-55
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Tidskriftsartikel (refereegranskat)abstract
- The impact of linearly elastic rod on a thin linearly viscoelastic target which rests on a rigid foundation is considered. The behaviour of the target is quasi-static. The special case of a cylindrical linearly elastic rod impacting on a thin Kelvin target is studied in detail and the maximum impact force, the coefficient of restitution and the energy absorption of the target are determined
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| 5. |
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| 6. |
- van Maurik Matuk, Fernanda A., et al.
(författare)
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Advancing co-production for transformative change by synthesizing guidance from case studies on the sustainable management and governance of natural resources
- 2023
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Ingår i: Environmental Science and Policy. - 1462-9011. ; 149
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Tidskriftsartikel (refereegranskat)abstract
- Co-production has become paramount for scientists, practitioners and social groups of Indigenous peoples and local communities of rural and urban areas to deliver transformative changes that enhance sustainability. Co-production should result in knowledge that is credible, legitimate and usable to enable sustainable outcomes effectively. However, this is not always the case due to challenges related to differences between scientific and Indigenous and local knowledge, as well as inherent power imbalances. The literature emphasises that these challenges are often triggered by rigid scientific theories and postures, dominant practices, and time-money limitations that co-production projects involve. This happens despite the adoption of guidelines recommended in the literature. We investigate the role of these challenges and guidelines in the generation of credible, legitimate, usable, and effective knowledge. We analyse this role in 13 co-production cases focused on sustainable transformative changes linked with the management and governance of natural resources across the globe. Despite challenges varying between groups and contexts, credibility, usability, and effectiveness are promoted simultaneously, especially when co-production empowers social actors via legitimate processes. Scientists and practitioners do so, through creative and flexible reshaping of existing knowledge and worldviews with a focus on common goals that link sustainability and livelihoods. They conceptualise a mutual understanding of knowledge and that is deemed trustworthy feasible to use in their socioecological context. Our findings complement existing scholarship on co-production, exploring the credibility of situated knowledge and its practical effectiveness together with its commonly addressed legitimacy and usability. A focus on the practices of different actors, including dynamics that are external to co-production, and changes in the scientific and social status quo, are needed to advance co-production effectiveness.
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