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Добірка наукової літератури з теми "Configurations of Mechanisms"

Автор: Grafiati

Опубліковано: 8 березня 2025

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Статті в журналах з теми "Configurations of Mechanisms"

Zhang, W., X. Ding, and J. Liu. "A representation of the configurations and evolution of metamorphic mechanisms." Mechanical Sciences 7, no. 1 (February 9, 2016): 39–47. http://dx.doi.org/10.5194/ms-7-39-2016.

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Abstract. Metamorphic mechanisms are members of the class of mechanisms that are able to change their configurations sequentially to meet different requirements. The paper introduces a comprehensive symbolic matrix representation for characterizing the topology of one of these mechanisms in a single configuration using general information concerning links and joints. Furthermore, a matrix representation of an original metamorphic mechanism that has the ability to evolve is proposed by uniting the matrices representing all of the mechanism's possible configurations. The representation of metamorphic kinematic joints is developed in accordance with the variation laws of these mechanisms. By introducing the joint variation matrices derived from generalized operations on the related symbolic adjacency matrices, evolutionary relationships between mechanisms in adjacent configurations and the original metmaorphic mechanism are made distinctly. Examples are provided to demonstrate the validation of the method.

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Zhai, Guangqing, Jianguo Tao, Hong Xiao, Hongwei Guo, Guang Yang, Runchao Zhao, Chen Yao, and Rongqiang Liu. "Design of Multi-Wing Deployment Mechanism Based on Multiple Performance Indicators and Topology: Theoretical and Experimental Study." Applied Sciences 14, no. 24 (December 13, 2024): 11672. https://doi.org/10.3390/app142411672.

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The folding wing deployment mechanisms of aircraft are constrained by weight and space limitations, necessitating fewer actuators, multiple outputs, compact designs, and high efficiency. However, existing folding wing mechanisms often overlook the impact of performance in configuration design. Additionally, they struggle to achieve the synchronous unfolding of multiple wings using a single drive. This paper presents a design methodology for multi-wing deployment mechanisms based on configuration topology and multiple performance indicators. Specifically, seventeen configurations of multi-wing deployment mechanisms are developed based on functional requirements, along with expression methods for performance indicators, including compactness, mechanism stiffness, dynamic sensitivity, motion transmission, and joint transmission efficiency. The optimal configuration for the multi-wing deployment mechanism is identified utilizing the fuzzy comprehensive evaluation. Moreover, the transmission efficiency of multiple configurations is calculated across different scale parameters. Simulation analyses and prototype experiments are conducted to validate the design. The results indicate that the transmission efficiency of the optimized configuration consistently exceeds that of the other configurations. Maximum efficiencies surpass those of the other configurations by 2.4% and 5.7%. Importantly, this study introduces a quantitative expression method for multiple performance indicators at the configuration design stage. This approach enables the integration of various performance metrics with configuration designs. Overall, this research provides a novel approach for the innovative design of multi-wing deployment mechanisms in aircraft. Additionally, considering performance in the selection of mechanism configurations during engineering design offers valuable insights and potential applications.

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Dijksman, E. A. "Assembling Complete Pole Configurations for (Over)Constrained Planar Mechanisms." Journal of Mechanical Design 116, no. 1 (March 1, 1994): 215–25. http://dx.doi.org/10.1115/1.2919350.

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Анотація:

The complete pole configuration of a planar n-link mechanism having one instantaneous degree of mobility, possesses (3n−4)/2 independent poles determining (n−2)2/2 remaining poles of the configuration. The dependency is demonstrated through Desargues’ Theorem and her generalizations. Simultaneously, pole configurations have been “elated” into three-dimensional point-lattices intersected by a plane. The insight obtained in these configurations allows the designer to find clues in building overconstrained linkage mechanisms meeting certain geometrical properties.

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Chen, Yan-song, I.-Ming Chen, and Tyng Liu. "A design approach for multi-configuration hybrid transmission mechanisms." Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 234, no. 12 (June 20, 2020): 2744–58. http://dx.doi.org/10.1177/0954407020924981.

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Several hybrid architectures have been widely used in hybrid electric vehicles. For example, power-split architecture brings seamless operation, while parallel architecture makes the internal combustion engine directly drive the wheel. To combine the advantages of various architectures, this study aims to develop a design approach to create a transmission mechanism that has multiple configurations and uses these configurations to achieve several hybrid architectures. First, this study standardized hybrid transmission mechanisms using the Function Power Graph; this powerful and intuitive tool inspired several elements and an element layout for the new mechanisms. Then, several configurations with up to five elements were enumerated and organized into the databases. Next, the mechanisms with multiple configurations and a limited number of clutching units (clutches or brakes) were evaluated, 10 of which were identified as the best group that provided five parallel configurations, two 2-motor electric vehicle configurations, and a power-split configuration. At the end of this paper, a novel hybrid transmission mechanism was developed as a demonstration. It provides higher power and torque at the output but there is no need to use the larger internal combustion engine or motor-generators. This mechanism also enables the internal combustion engine to drive in overdrive parallel architectures to avoid the loss in energy conversion when the power-split architecture is not required. As a result, after a designer specifies the desired hybrid configurations, follows the procedure, and uses the configuration databases built in this study, a novel hybrid transmission mechanism will be created.

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Kuo, Chin-Hsing, and Hong-Sen Yan. "On the Mobility and Configuration Singularity of Mechanisms With Variable Topologies." Journal of Mechanical Design 129, no. 6 (May 17, 2006): 617–24. http://dx.doi.org/10.1115/1.2717230.

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The mechanisms with variable topologies (MVTs) are usually changing their topological structures in accordance with the varying mobility and quasi-singular configurations. The mobility analysis and configuration singularity of MVTs are studied via screw theory in this paper. The configurations of MVTs are formulated by a set of variable combinations of screw coordinates. For the mobility analysis, two examples provided show that the proposed approach is adoptable for dealing with common MVTs. For the configuration singularity, the concepts of stationary configuration and uncertainty configuration are utilized to demonstrate the topology varying strategy of MVTs. The result in this work provides the theoretical basis and inspiration for the configuration synthesis and analysis of mechanisms with variable topologies.

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Yahlinskyi, V. P., S. S. Hutyria, and V. V. Vovk. "AMBIGUITY AND SINGULARITY MECHANISMS OF PARALLEL STRUCTURE OF BIGLIDE TYPE." Key title: Zbìrnik naukovih pracʹ Odesʹkoï deržavnoï akademìï tehnìčnogo regulûvannâ ta âkostì, no. 1(22) (2023): 45–52. http://dx.doi.org/10.32684/2412-5288-2023-1-22-45-52.

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Анотація:

The article deals with the issues of planning and obtaining shaping trajectories of the mechanisms of a parallel structure of the biglide type. The possibilities of forming functional trajectories of a biaxial two-coordinate biglide in the direct problem in the form of generalized coordinates of the degrees of freedom and the inverse problem in the form of gripper pole coordinates are considered. The conditions for the occurrence of ambiguity in the position of the mechanism in direct and inverse problems are revealed. To avoid ambiguity, it is proposed to control the process of forming a trajectory using an additional parameter. In the process of computer 3-D modeling, singular configurations of the biaxial bigglide mechanism with parallel guides were studied. Analytical models for the formation of trajectories are developed and kinematic conditions are proposed for avoiding locking processes in the mechanism in singular configurations. Singular configurations with quasi-zero and negative stiffness have been found for the mechanism of a parallel structure of the biglide type. Using the Lagrange principle of virtual (possible) displacements, analytical models of the generalized stiffness coefficients of the mechanism are obtained depending on the formed configuration. Configurations with quasi-zero stiffness correspond to zero values of the stiffness coefficients, and for negative stiffness, a characteristic transition through a singular configuration. Analytical expressions for the relative rigidities of the biglide mechanism are obtained and diagrams of their change for different configurations are constructed. The influence of the design parameters of the biglide on the value of the relative generalized stiffness of the entire mechanism has been studied. It has been established that within the range of configuration angle change from 0 to 12° and from 45° to 80°, the values of relative stiffness coefficients are much higher than within the range from 15° to 45°, which allows controlling the rigidity of the mechanism and having a positive effect on the positioning accuracy of the pole. biglide.

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Brunetti, Jacopo, Walter D’Ambrogio, and Annalisa Fregolent. "Configuration-Dependent Substructuring as a Tool to Predict the Vibrational Response of Mechanisms." Machines 10, no. 12 (December 1, 2022): 1146. http://dx.doi.org/10.3390/machines10121146.

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Dynamic substructuring allows us to predict the dynamic behavior of mechanical systems built by linking together several subsystems, whose dynamic behavior is known. The classical formulation, originally conceived for invariant systems, was extended by the authors to include mechanical systems made by invariant subsystems that may be coupled in different configurations. A mechanism is a typical example of a mechanical system built by coupling together invariant subsystems; during its motion, it can take several configurations that significantly affect its vibrational behavior. Therefore, the configuration-dependent substructuring approach can provide meaningful insights into the dynamic behavior of the mechanism. In this paper, the proposed approach is exploited to evaluate the vibrational behavior of a three-point linkage, a widely used mechanism to connect agricultural tractors to operating machines, considering a significant range of operative configurations. The proposed substructuring approach is able to predict the frequency response functions, the natural frequencies and the mode shapes of the mechanism in a wide range of configurations.

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Kuo, Chin-Hsing, Jyun-Wei Su, and Lin-Chi Wu. "An Algebraic Formulation for the Configuration Transformation of a Class of Reconfigurable Cube Mechanisms." Mechanical Sciences 8, no. 1 (April 12, 2017): 101–9. http://dx.doi.org/10.5194/ms-8-101-2017.

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Abstract. This paper presents an algebraic strategy for formulating the configuration transformation of a special class of reconfigurable cube mechanism (RCM) made by 23 cyclically connected sub-cubes. The RCM studied here is kinematically equivalent to a spatial eight-bar linkage having eight transformable configurations. In this paper, the reconfiguration characteristics of the RCM are figured out first. Then, the initial configuration of the RCM is described by a joint-screw matrix, from which all the consecutive joint-screw matrices that represent the configuration transformation of the RCM can be derived. An illustrative example is provided to determine the eight joint-screw matrices of an RCM at an initial configuration. This reconfiguration formulation is further applied to enumerate all feasible topological configurations of such a special reconfigurable mechanism. The results show that, for such a special kind of reconfigurable cube mechanisms, there is only one feasible initial topological configuration for the RCM to perform a complete cycle of reconfiguration.

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Chen, Tzu-Hsia, and Long-Chang Hsieh. "The Design of Mold Clamping Mechanisms with Two Dead-Position Configurations." Advances in Technology Innovation 5, no. 1 (January 1, 2020): 33–44. http://dx.doi.org/10.46604/aiti.2020.4164.

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Blow-molding machines are divided into two types: (1) rotary type blow-molding machine, and (2) linear type blow-molding machine. Good kinematic characteristics of mold clamping mechanism is the goal pursued by manufacturers of blow-molding machine. Traditionally, the mold clamping mechanism has only one dead-position configuration for the mold in the closed position. When the mold is in the open position, the mold clamping mechanism does not have dead-position configuration. This study focuses on the design of mold clamping mechanisms with two dead-position configurations when the mold is in open and closed positions. Firstly, with reference to the existing patents, based on the Yan's creative design methodology, four design concepts of mold clamping mechanisms are synthesized. Then, according to the studies on kinematics of mechanisms, three mold clamping mechanisms with two dead-position configurations are also synthesized. The results of this paper will enhance the research and development (R&D) capability of the mold clamping mechanisms to improve industrial competitiveness.

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WANG, JING, and CLÉMENT M. GOSSELIN. "PASSIVE MECHANISMS WITH MULTIPLE EQUILIBRIUM CONFIGURATIONS." Transactions of the Canadian Society for Mechanical Engineering 28, no. 2A (May 2004): 139–51. http://dx.doi.org/10.1139/tcsme-2004-0011.

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Дисертації з теми "Configurations of Mechanisms"

Jensen, Brian D. "Identification of Macro- and Micro-Compliant Mechanism Configurations Resulting in Bistable Behavior." BYU ScholarsArchive, 2003. https://scholarsarchive.byu.edu/etd/83.

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The purpose of this research is to identify the configurations of several mechanism classes which result in bistable behavior. Bistable mechanisms have use in many applications, such as switches, clasps, closures, hinges, and so on. A powerful method for the design of such mechanisms would allow the realization of working designs much more easily than has been possible in the past. A method for the design of bistable mechanisms is especially needed for micro-electro-mechanical systems (MEMS) because fabrication and material constraints often prevent the use of simple, well-known bistable mechanism configurations. In addition, this knowledge allows designers to take advantage of the many benefits of compliant echanisms, especially their ability to store and release energy in their moving segments. Therefore, an analysis of a variety of mechanism classes has been performed to determine the configurations of compliant segments or rigid-body springs in a mechanism which result in bistable behavior. The analysis revealed a relationship between the placement of compliant segments and the stability characteristics of the mechanism which allows either analysis or synthesis of bistable mechanisms to be performed very easily. Using this knowledge, a method of type synthesis for bistable mechanisms has been developed which allows bistable mechanisms to be easily synthesized. Several design examples have been presented which demonstrate the method. The theory has also been applied to the design of several bistable micromechanisms. In the process of searching for usable designs for micro-bistable mechanisms, a mechanism class was defined, known as "Young" mechanisms, which represent a feasible and useful way of achieving micro-mechanism motion similar to that of any four-bar mechanism. Based on this class, several bistable micro-mechanisms were designed and fabricated. Testing demonstrated the ability of the mechanisms to snap between the two stable states. In addition, the mechanisms showed a high degree of repeatability in their stable positions.

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Alfattani, Rami. "Design of Shape-Morphing Structures Consisting of Bistable Compliant Mechanisms." Scholar Commons, 2019. https://scholarcommons.usf.edu/etd/7725.

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This dissertation presents a design concept for shape-morphing structures that have two stable configurations. The design concept defines the methodology of transforming a planar structural shape into spatial structural shape using bistable compliant mechanisms. Bistable complaint mechanisms are used to achieve structural stable configurations. The dissertation incorporating geometrical relationships for the mechanisms that form the primary structure described in step-by-step process. This dissertation implements the design layouts for designer to creating shape-morphing structures including origami. The novel contribution of the work is classified in three models. The first model presents a methodology to induce bistability behavior into an origami reverse fold and partially spherical compliant mechanism. The second model presents the design and development of a bistable triangle-shaped compliant mechanism with motion limits and dwell behavior at the two stable configurations. This mechanism can be arrayed to create shape-morphing structures. The third model presents a design and development for a collapsible bistable compliant mechanism used for a shape morphing lamina-emergent frustum. Finally, physical prototypes of all models are presented as proof of concept.

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Cerminara, Adriano. "Boundary-layer receptivity and breakdown mechanisms for hypersonic flow over blunt leading-edge configurations." Thesis, University of Southampton, 2017. https://eprints.soton.ac.uk/412641/.

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Direct numerical simulations have been performed to study receptivity and breakdown mechanisms for hypersonic flow over blunt leading-edge configurations with imposed freestream acoustic disturbances. Both two-dimensional (2D) and three-dimensional (3D) fast and slow acoustic wave models have been used. The former has been adopted for 2D simulations over a blunt-nose wedge probe designed to measure freestream noise levels in hypersonic wind tunnels; the latter has been used to perform 3D simulations for a span-periodic blunt wedge in unswept and swept configurations, and for a three-dimensional generic forebody model. In the 2D wedge simulations, an analysis of the post-shock wave structure shows that fast acoustic waves are efficiently transmitted across the shock as refracted waves, while slow acoustic waves generate convected waves. The wall response to the fast mode highlights a resonance-modulation behaviour in the nose region. An estimation of the freestream noise levels in the DLR high-enthalpy (HEG) and low-enthalpy (RWG) hypersonic wind tunnels has been performed, showing higher noise levels for the HEG wind tunnel at high Mach numbers. The 3D wedge simulations have been used to study the characteristics of the receptivity and breakdown mechanisms associated with different wave types (fast/slow), disturbance amplitudes, and sweep angles. The fast-mode induced transition has been observed to be a much more rapid and powerful process than the slow-wave related transition, because of the role played by the fast-mode resonance mechanism at the leading edge. Finally, the numerical simulations performed for a generic forebody geometry have enabled comparison with a recent transition experiment carried out in the Mach 6 Purdue hypersonic wind tunnel in noisy conditions. In this case, slow acoustic waves show the most similar transition patterns to the experimental case, and, in particular, are more efficient than fast waves in triggering nonlinear growth of streamwise streaks, related to crossflow inflectional instabilities located in the off-centerline leading-edge region.

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Habib, Farooq. "Interplay between network configurations and network governance mechanisms in supply networks a systematic literature review." Thesis, Cranfield University, 2012. http://dspace.lib.cranfield.ac.uk/handle/1826/7879.

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Purpose: This work systematically reviews the extant academic management literature on supply networks. It specifically examines how network configurations and network governance mechanisms influence each other in supply networks. Design: 125 analytical and empirical studies were identified using an evidence-based approach to review the literature mainly published between 1985 and 2012. Synthesis: Drawing on a multi-disciplinary theoretical foundation, this work develops an integrative framework to identify three distinct yet interdependent themes that characterize the study of supply networks: a) Network Configurations (structures and relationships); b) Network Governance Mechanisms (formal and informal); and c) The Interplay between Network Configurations and Network Governance Mechanisms. Findings: Network configurations and network governance mechanisms mutually influence each other and cannot be considered in isolation. Formal and informal governance mechanisms provide better control when used as complements rather than as substitutes. The choice of governance mechanism depends on the nature of exchange; role of management; desired level of control; level of flexibility in formal contracts; and complementary role of formal and informal governance mechanism. Research implications: This nascent field has thematic and methodological research opportunities for academics. Comparative network analysis using longitudinal case studies offers a rich area for further study. Practical Implications: The complexity surrounding the conflicting roles of managers at the organisation and network levels poses a significant challenge during the development and implementation stage of strategic network policies. Originality/value: This review reveals that formal and informal governance mechanisms provide better control when used as complements rather than as substitutes.

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Ozdemir, Mustafa. "Inverse Dynamics Control Of Parallel Manipulators Around Singular Configurations." Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/3/12609212/index.pdf.

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In this thesis, a technique for the motion of parallel manipulators through drive singularities is investigated. To remedy the problem of unbounded inverse dynamics solution in the neighborhood of drive singularities, an inverse dynamics controller which uses a conventional inverse dynamics control law outside the neighborhood of singularities and switches to the mode based on the formerly derived modified equations inside the neighborhood of singularities is proposed. As a result, good tracking performance is obtained while the actuator forces remain within the saturation limits of the actuators around singular configurations.

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Ferrigno, Giulio. "Strategic alliances: value creation and appropriation mechanisms, configuration, and portfolio evolution." Doctoral thesis, Università di Catania, 2018. http://hdl.handle.net/10761/3863.

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The object of this dissertation is to provide a better understanding of strategic alliances with a specific focus on value creation and value appropriation mechanisms, alliance configuration, and the evolution of alliance portfolios. In more detail, the purpose of the dissertation is threefold: (I) to summarize the existing alliance research around value creation and value appropriation processes, which are the two distinct, dynamic and interrelated processes underlying alliance partners performance. In doing so, it aims to shed lights on the theoretical underpinnings that explain the key value creation and value appropriation mechanisms that lie beneath the two processes. In addition, it aims to clarify the interdependence between the two processes, thereby advancing a contribution that conceptually tackles the need to treat value creation and value appropriation jointly (e.g., Di Minin and Faems, 2013; Lepak et al., 2007); (II) to rejoin the challenge to explore the relationship between R&D alliances and alliance partners innovation performance, by relying on the theoretical lens of the knowledge-based view of the alliances (Grant & Baden-Fuller, 2004; Vasudeva & Anand, 2011). Specifically, by adopting this theoretical lens we challenge the issue to identify the major factors that lead alliance partners to achieve high innovation performance by means of R&D alliances. Additionally, a challenge of the research is to revamp a key research stream in the alliance literature (i.e., alliance configuration) by examining the combinatory effects that inevitably occur among these factors; (III) to explore the features that epitomize alliance strategy with regards to the management of alliance portfolio. In particular, the dissertation aims to undertake an investigation of the existing body of research on alliance portfolio management in order to elucidate its main features. In addition, the dissertation is aiming to complement extant research with an investigation of these features in a case study (Ericsson) in order to provide insights on alliance strategy, from the managerial point of view (Hoffman, 2005).

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Habibi, Rabeb. "Les mécanismes de performance de la diversification des business models : une analyse QCA des compagnies aériennes." Electronic Thesis or Diss., Université de Lille (2022-....), 2024. https://pepite-depot.univ-lille.fr/ToutIDP/EDSJPG/2024/2024ULILD020.pdf.

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Анотація:

Malgré le nombre croissant d'entreprises déployant plusieurs Business Models simultanément, peu de recherches se sont intéressées au lien entre la diversification des Business Models et la performance. L'objectif de cette thèse est d’appréhender cette relation en étudiant les mécanismes qui lui sont sous-jacents. En utilisant des données provenant de l'industrie mondiale du transport aérien, nous avons réalisé dix-huit analyses QCA et documenté les choix relatifs aux mécanismes d'exploitation des synergies et de réduction des anti-synergies au sein des compagnies aériennes qui exploitent simultanément un Business Model Low-Cost parallèlement à leur Business Model originel à service complet. La mobilisation d’une approche configurationnelle, nous a permis d’identifier les configurations de mécanismes expliquant la performance et la haute performance d’un portefeuille de Business Models. Nos résultats suggèrent que les mécanismes d'exploitation des synergies et de réduction des anti-synergies sont complémentaires et interdépendants. Contrairement à ce que suggèrent certaines recherches, il ressort que l'exploitation des synergies liées aux ressources n'est pas suffisante pour expliquer la performance des portefeuilles de Business Models. En outre, nos résultats montrent une divergence des combinaisons de mécanismes d'exploitation des synergies liées aux ressources. Cependant, ces derniers n'ont pas révélé de différence majeure entre les configurations de mécanismes à court et à moyen terme. Par ailleurs, l'analyse des cas typiques et déviants nous a permis d'identifier une nouvelle typologie de synergies et d'anti-synergies, qui tient compte des dimensions temporelle et interactionnelle de ces mécanismes. Les contributions de la thèse soulignent la nature équifinale, non linéaire et asymétrique des configurations de mécanismes expliquant la performance des portefeuilles de Business Models
Despite the growing number of companies deploying multiple Business Models simultaneously, few studies have explored the link between Business Model diversification and performance. The objective of this thesis is to study this relationship by examining the underlying mechanisms. Using data from the global airline industry, we conducted eighteen QCA analyses and documented the choices related to the mechanisms of exploiting synergies and reducing anti-synergies within airlines that simultaneously operate a low-cost Business Model and their original full-service Business Model. The deployment of a configurational approach allowed us to identify the configurations of mechanisms explaining both performance and high performance in a portfolio of Business Models. Our results suggest that the mechanisms for exploiting synergies and reducing anti-synergies are complementary and interdependent. Contrary to what some research suggests, it emerges that the exploitation of resource-related synergies alone is not sufficient to explain the performance of Business Model portfolios. Furthermore, our results reveal a divergence in the combinations of mechanisms for exploiting resource-related synergies. Meanwhile, our results did not reveal a significant difference between short-term and medium-term mechanism configurations. Additionally, the analysis of typical and deviant cases allowed us to identify a new typology of synergies and anti-synergies that considers the temporal and interactional dimensions of these mechanisms. The contributions of the thesis highlight the equifinal, non-linear and asymmetric nature of the configurations of mechanisms explaining the performance of Business Model portfolios

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Williams, Robert L. "Planar robotic mechanisms: analysis and configuration comparison." Diss., Virginia Polytechnic Institute and State University, 1988. http://hdl.handle.net/10919/54462.

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Анотація:

Robotic mechanisms are defined in this dissertation to be closed-loop, in-parallel actuated mechanical devices possessing several degrees-of-freedom. Parallel robotic mechanisms have recently received attention in the robotics literature as a potential alternative to the existing serial industrial robot. Serial robots are in a cantilever configuration which makes them relatively compliant and Ieads to poor accuracy. Many serial manipulators have motors that are carried on moving links which limits dynamic performance. Robotic mechanisms are in a parallel configuration which provides excellent stiffness, load-bearing, and accuracy. Robotic mechanisms combine the advantages of serial robots and closed-loop single-degree-of-freedom mechanisms to form a versatile new robotic tool. This dissertation presents theoretical kinematic analysis and design of planar robotic mechanisms. The topics covered are type and number synthesis, kinematic position solution, velocity and acceleration analysis, kinetostatic analysis, workspace optimization, and link interference avoidance. Throughout this work, comparisons are made among three general manipulator configurations: serial, parallel-serial, and fully parallel. Strengths and limitations are discussed for each configuration type. This investigation provides the analytical foundation for implementation of planar robotic mechanisms. Closed-form solutions to the kinematic position, velocity, and acceleration problems are presented. Manipulator reachable hand areas are maximized. An underlying theme of this work is tradeoffs between competing factors relating to various configurations of parallel robotic mechanisms; these tradeoffs are important design considerations. The recommendation of this dissertation is to pursue practical development of robotic mechanisms for general industrial manipulation tasks.
Ph. D.

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Pohl, Eric David. "Analysis of singular configurations for robotic manipulators." Thesis, Georgia Institute of Technology, 1988. http://hdl.handle.net/1853/18368.

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Hanna, Brandon Holbrook. "Modeling and Testing of Bistable Waterbomb Base Configurations." BYU ScholarsArchive, 2014. https://scholarsarchive.byu.edu/etd/4336.

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Origami is making an impact in engineering as solutions to problems are being found by applying origami principles (eg. flat-foldability) and using specific crease patterns as inspiration. This thesis presents an in-depth analysis of a particular origami fold -- the waterbomb base -- to facilitate its use in future engineering problems. The watebomb base is of interest due to its familiarity to the origami community, simple topology (can be made by folding a single sheet of paper four times), scalability, generalizability, and interesting kinetic behavior. It can behave as a nonlinear spring as well as a one- or two-way bistable mechanism. This thesis presents models of the kinetic behavior of the traditional waterbomb base as well as some non-traditional variants to be used as tools in future development of waterbomb-base-inspired mechanisms. In all cases considered here, developability as well as rotational symmetry in both the geometry and motion of the mechanisms are assumed. The thesis provides an introduction to origami and reviews some of the ways in which it has been studied and applied in engineering fields. The waterbomb base is also presented as a specific origami fold with practical application potential. Models for the behavior of the traditional waterbomb base are introduced and its potential usefulness as a testbed for actuation methods is discussed. Models are developed for its kinematic and bistable behavior, including the forces needed to transition between stable states. These models are validated by comparison to physical prototype testing and finite element analysis. The thesis introduces the generalized waterbomb base (WB) and generalized split-fold waterbomb base (SFWB). The WB maintains the pattern of alternating mountain and valley folds around the vertex but in this generalized case any even number of folds greater than or equal to 6 is allowed. An SFWB is created by splitting each fold of a WB into two “half folds”, effectively doubling the number of folds and links but halving the deflection at each fold. The same models that were developed for the traditional waterbomb base are developed for the WB and the SFWB and a few potential applications are discussed.

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Книги з теми "Configurations of Mechanisms"

Müller, Andreas, and Dimiter Zlatanov, eds. Singular Configurations of Mechanisms and Manipulators. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-05219-5.

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Behnke, Nathalie, Jörg Broschek, and Jared Sonnicksen, eds. Configurations, Dynamics and Mechanisms of Multilevel Governance. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-05511-0.

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Latré, Steven, Marinos Charalambides, Jérôme François, Corinna Schmitt, and Burkhard Stiller, eds. Intelligent Mechanisms for Network Configuration and Security. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-20034-7.

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Faltings, Boi. Qualitative place vocabularies for mechanisms in configuration space. Urbana, IL (1304 W. Springfield Ave., Urbana 61801): Dept. of Computer Science, University of Illinois at Urbana-Champaign, 1987.

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Sacks, Elisha. The configuration space method for kinematic design of mechanisms. Cambridge, MA: The MIT Press, 2010.

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1961-, Joskowicz Leo, ed. The configuration space method for kinematic design of mechanisms. Cambridge, Mass: MIT Press, 2010.

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C, Vafidis, Whitelaw James H, and United States. National Aeronautics and Space Administration., eds. Velocimetry with refractive index watching for complex flow configurations. Glastonbury, Conn: Scientific Research Associates, inc., 1987.

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Maugin, G. A. Configurational forces: Thermomechanics, physics, mathematics, and numerics. Boca Raton: Chapman & Hall/CRC, 2010.

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Chaussee, D. S. Numerical simulation of viscous supersonic flow over a generic fighter configuration. Moffett Field, Calif: National Aeronautics and Space Administration, Ames Research Center, 1986.

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Частини книг з теми "Configurations of Mechanisms"

McCloy, D., and D. M. J. Harris. "Mechanisms and robot configurations." In Robotics: An Introduction, 27–58. Dordrecht: Springer Netherlands, 1986. http://dx.doi.org/10.1007/978-94-010-9752-9_2.

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Romiti, A., T. Raparelli, and M. Sorli. "Robot Wrist Configurations, Mechanisms and Kinematics." In Schriftenreihe der Wissenschaftlichen Landesakademie für Niederösterreich, 44–48. Vienna: Springer Vienna, 1994. http://dx.doi.org/10.1007/978-3-7091-9346-4_8.

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Husty, Manfred L., and Dominic R. Walter. "Mechanism Constraints and Singularities—The Algebraic Formulation." In Singular Configurations of Mechanisms and Manipulators, 101–80. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-05219-5_4.

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Zlatanov, Dimiter. "Generalized Singularity Analysis." In Singular Configurations of Mechanisms and Manipulators, 1–38. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-05219-5_1.

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Bohigas, Oriol. "Singularity Set Computation: A Hands-On Session with the CUIK Suite." In Singular Configurations of Mechanisms and Manipulators, 39–65. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-05219-5_2.

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Wenger, Philippe. "Cuspidal Robots." In Singular Configurations of Mechanisms and Manipulators, 67–99. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-05219-5_3.

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Müller, Andreas. "Local Investigation of Mobility and Singularities of Linkages." In Singular Configurations of Mechanisms and Manipulators, 181–229. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-05219-5_5.

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Behnke, Nathalie, Jörg Broschek, and Jared Sonnicksen. "Introduction: The Relevance of Studying Multilevel Governance." In Configurations, Dynamics and Mechanisms of Multilevel Governance, 1–19. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-05511-0_1.

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Knodt, Michèle. "Multilevel Coordination in EU Energy Policy: A New Type of “Harder” Soft Governance?" In Configurations, Dynamics and Mechanisms of Multilevel Governance, 173–91. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-05511-0_10.

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Hartlapp, Miriam. "Soft Law Implementation in the EU Multilevel System: Legitimacy and Governance Efficiency Revisited." In Configurations, Dynamics and Mechanisms of Multilevel Governance, 193–210. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-05511-0_11.

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Тези доповідей конференцій з теми "Configurations of Mechanisms"

Dash, Sabyasachi, and Girish Krishnan. "Enumerating Deformed Configurations of Reconfigurable Meshed Cellular Robots." In 2024 6th International Conference on Reconfigurable Mechanisms and Robots (ReMAR), 433–38. IEEE, 2024. http://dx.doi.org/10.1109/remar61031.2024.10617572.

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Foster, David E., and Raymond J. Cipra. "Assembly Configurations of Planar Non-Single-Input-Dyadic Mechanisms." In ASME 1997 Design Engineering Technical Conferences. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/detc97/dac-3858.

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Abstract This paper examines the problem of enumerating the assembly configurations (ACs), also called circuits, of planar non-single-input-dyadic (NSID) mechanisms. An SID mechanism is a multi-loop mechanism which can be defined by adding one loop at a time such that the mechanism has one degree of freedom (DOF) after each loop is added. An NSID mechanism is any mechanism that does not meet the SID criterion, i.e. it does not have one DOF after each loop is added. This includes all multi-DOF mechanisms, as well as some complex single-DOF mechanisms. The number of ACs of an NSID mechanism may be determined by defining the mechanism one loop at a time. The emphasis in this paper is on using graphical interpretation to determine the mobility regions of the mechanism which are preserved when each new loop is added to the mechanism. Several examples are given to demonstrate the use of this method, spanning the simpler NSID mechanisms, up to the three-loop, eight-bar linkage. The scope of this method includes mechanisms for which there are never more than 2 DOF when any loop is added. Only mechanisms with pin joints are considered in this paper.

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Jensen, Brian D., and Larry L. Howell. "Identification of Compliant Pseudo-Rigid-Body Mechanism Configurations Resulting in Bistable Behavior." In ASME 2000 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/detc2000/mech-14147.

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Abstract Bistable mechanisms, which have two stable equilibria within their range of motion, are important parts of a wide variety of systems, such as closures, valves, switches, and clasps. Compliant bistable mechanisms present design challenges because the mechanism’s energy storage and motion characteristics are strongly coupled and must be considered simultaneously. This paper studies compliant bistable mechanisms which may be modeled as four-link mechanisms with a torsional spring at one joint. Theory is developed to predict compliant and rigid-body mechanism configurations which guarantee bistable behavior. With this knowledge, designers can largely uncouple the motion and energy storage requirements of a bistable mechanism design problem. Examples demonstrate the power of the theory in bistable mechanism design.

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Derderian, James M., Larry L. Howell, Morgan D. Murphy, Scott M. Lyon, and Spencer D. Pack. "Compliant Parallel-Guiding Mechanisms." In ASME 1996 Design Engineering Technical Conferences and Computers in Engineering Conference. American Society of Mechanical Engineers, 1996. http://dx.doi.org/10.1115/96-detc/mech-1208.

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Abstract The rigid-link parallel-guiding (or parallelogram) mechanism is perhaps one of the simplest closed-loop mechanisms to analyze. Compliant parallel-guiding mechanisms, often called plate-spring mechanisms, are in common use in many applications. Advances in compliant mechanism modeling and synthesis have provided an opportunity to apply these mechanisms in an even wider range of uses. Unlike the rigid-link parallel-guiding mechanism which has a simple configuration defined by one kinematic chain, this paper reveals that twenty-eight compliant parallel-guiding mechanism configurations exist. Also, traditional plate spring mechanisms have been designed to function in the linear, small-deflection range and this paper describes a design approach that allows for deflections well into the non-linear range. The purpose of this paper is then threefold: i) identify all configurations of compliant parallel-guiding mechanisms, ii) provide a method for the design and analysis of compliant parallel-guiding mechanisms, and iii) provide experimental data to validate the above purposes. Additionally, the third purpose mentioned is important outside of the context of the parallel-guiding mechanism. The experimental results presented will help to validate the pseudo-rigid-body-model concept.

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Rastegar, J., and Q. Tu. "Geometrically Approximated Grashof-Type Movability Conditions for Spatial RSRC Mechanisms With Transmission Angle Limitations." In ASME 1989 Design Technical Conferences. American Society of Mechanical Engineers, 1989. http://dx.doi.org/10.1115/detc1989-0151.

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Abstract For closed-loop spatial RSRC mechanisms, Grashof-type movability conditions (i.e., conditions for the existence of crank-rocker and drag link types of mechanisms) are derived using geometrical approximation. The movability conditions are derived in the presence and absence of transmission angle limitations. The mechanism has two branches (configurations). Without transmission angle limitations, both configurations have identical movability conditions. However, by including transmission angle limitations, the movability conditions become different for each configuration of the mechanism. The movability conditions eliminate the possibility of changeover from one configuration to the other.

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Kohli, D., C. A. Pan, and A. K. Dhingra. "Double Points and Unstable Configurations of Stephenson-I, -II, and -III Mechanisms." In ASME 2000 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/detc2000/mech-14178.

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Abstract Double points are conjugate configurations in mechanisms, with multiple closed-loops, when both input and output links are fixed in the same position and some passive joints can be located in two different configurations. Unstable configurations, on other hand, are positions where a mechanism loses controllability and gains at least one unwanted DOF instantaneously. The analytical condition for the occurrence of double point is the same as the occurrence of an unstable configuration, i.e., two roots of input-output displacement polynomial are equal. This paper addresses the determination of double points and unstable configurations of six-link Stephenson-I, -II and -III mechanisms. The double points are determined by using the loop-closure equations for two branches and successively eliminating intermediate joint variables using closed-form techniques. Further, extraneous roots from algebraic manipulations are eliminated using a new technique of two-branch equation substitution. The unstable configuration polynomial is derived by (i) successively eliminating intermediate variables from loop-closure equations to obtain the input-output displacement polynomial, (ii) equating the polynomial discriminant to zero to obtain a polynomial which contains both unstable configurations and double points, and (iii) eliminating extraneous roots from algebraic manipulations and double points from this composite polynomial to determine the unstable configurations. The computational procedure is illustrated through numerical examples.

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Pan, C. A., D. Kohli, and A. K. Dhingra. "Double Points and Unstable Configurations of Watt-I and Watt-II Mechanisms." In ASME 2000 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/detc2000/mech-14201.

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Abstract Double points are conjugate configurations in mechanisms, with multiple closed-loops, when both input and output links are fixed in the same position and some passive joints can be located in two different configurations. Unstable configurations, on other hand, are positions where a mechanism loses controllability and gains at least one unwanted DOF instantaneously. The analytical condition for the occurrence of double point is the same as the occurrence of an unstable configuration, i.e., two roots of input-output displacement polynomial are equal. This paper addresses the determination of double points and unstable configurations of six-link Watt-I and Watt-II mechanisms. The double points are determined by using the loop-closure equations for two branches and successively eliminating intermediate joint variables using closed-form techniques. Further, extraneous roots from algebraic manipulations are eliminated using a new technique of two-branch equation substitution. The unstable configuration polynomial is derived by (i) successively eliminating intermediate variables from loop-closure equations to obtain the input-output displacement polynomial, (ii) equating the polynomial discriminant to zero to obtain a polynomial which contains both unstable configurations and double points, and (iii) eliminating extraneous roots from algebraic manipulations and double points from this composite polynomial to determine the unstable configurations. The computational procedure is illustrated through numerical examples.

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Di Gregorio, Raffaele, Alessandro Cammarata, and Rosario Sinatra. "On the Dynamic Isotropy of Mechanisms With Two Degrees of Freedom." In ASME 2005 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/detc2005-85023.

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The comparison of mechanisms with different topology or with different geometry, but with the same topology, is a necessary operation during the design of a machine sized for a given task. Therefore, tools that evaluate the dynamic performances of a mechanism are welcomed. This paper deals with the dynamic isotropy of 2-dof mechanisms starting from the definition introduced in a previous paper. In particular, starting from the condition that identifies the dynamically isotropic configurations, it shows that, provided some special cases are not considered, 2-dof mechanisms have at most a finite number of isotropic configurations. Moreover, it shows that, provided the dynamically isotropic configurations are excluded, the geometric locus of the configuration space that collects the points associated to configurations with the same dynamic isotropy is constituted by closed curves. This results will allow the classification of 2-dof mechanisms from the dynamic-isotropy point of view, and the definition of some methodologies for the characterization of the dynamic isotropy of these mechanisms. Finally, examples of applications of the obtained results will be given.

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Zhang, Liping, Delun Wang, and Jian S. Dai. "Evolution Based Synthesis of Metamorphic Mechanisms." In ASME 2007 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/detc2007-35544.

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A new methodology for configuration design of metamorphic mechanisms is developed based on genetic evolutionary operation with biological building blocks. The goal is to conceive the appropriate source-metamorphic-mechanism configuration given the multiple phases of kinematic functions in motion specifications. The key enabler of configuration synthesis is the method of capturing the metamorphic configuration characteristics and the genetic evolutionary criteria and of developing genetic evolution in modeling and design. With the unique characteristics of achieving multiple working-phase functions, the metamorphic mechanisms possess two features: one, the ametabolic feature referring to the specified sub-working phases that can be accomplished by traditional mechanisms; two, the metamorphic feature occurring transition between different working phases resulting change of topology of the mechanism. Based on this transition between phases, the concept of mechanism evolution is for the first time introduced in this paper based on biological building blocks in the form of metamorphic cells and associated inner elements as the metamorphic gene. This leads to development of cell evolution and genetic aggregation forms with mechanism decomposition and evolution formulation based on mapping from the source-metamorphic-mechanism to multi-phases working configurations. Examples are given to demonstrate the concept and principles.

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Foster, David E., and Raymond J. Cipra. "Assembly Configurations and Branches of Planar Single-Input Dyadic Mechanisms." In ASME 1996 Design Engineering Technical Conferences and Computers in Engineering Conference. American Society of Mechanical Engineers, 1996. http://dx.doi.org/10.1115/96-detc/mech-1143.

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Abstract This paper examines the problem of enumerating the assembly configurations (ACs), also called circuits, of planar single-input dyadic (SID) mechanisms which have links with pin joints and sliding joints. An SID mechanism is a multi-loop mechanism which can be defined by adding one loop at a time such that the mechanism has one degree of freedom after each loop is added. A method is given to find the ACs of such a mechanism. The emphasis is on using graphical interpretation to determine the mobility regions of the mechanism which are preserved when each new loop is added to the mechanism. This method of interpretation is readily automated. Each AC can be represented as a set of instructions for the input link to follow, along with a list of dyad configurations for each instruction. Each instruction corresponds to a branch of the mechanism. Examples are given to demonstrate the use of this method.

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Звіти організацій з теми "Configurations of Mechanisms"

Bond, Robert Bailey. Design of steel headed stud anchors in concrete-filled steel composite deck. Northeastern University, 2022. http://dx.doi.org/10.17760/d20473849.

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This paper reports common failure mechanisms of steel headed stud anchors (shear studs) in concrete-filled steel composite decks found in the literature comprised through an extensive database of push-out tests representing multiple shear stud configurations used in composite construction around the world. Monotonically and cyclically loaded push-out test specimens perpendicular or parallel steel deck, or in solid slabs, are included in the evaluation. Comparisons to experimental strengths are made with the steel headed stud anchor strength prediction methods from various international Codes and Standards along with other mechanics-based design provisions proposed in the literature. It was found that the prediction for concrete failure modes is often over-predicted, especially in deck perpendicular configurations. Two alternative design equations are presented within the context of the AISC Specification to address consideration for concrete related failures and are validated through comparisons both with push-out tests and composite beam tests found in the literature.

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Borenstein, N. A User Agent Configuration Mechanism for Multimedia Mail Format Information. RFC Editor, June 1992. http://dx.doi.org/10.17487/rfc1343.

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Borenstein, N. A User Agent Configuration Mechanism For Multimedia Mail Format Information. RFC Editor, September 1993. http://dx.doi.org/10.17487/rfc1524.

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Elacqua, Gregory, Anne Sofie Westh Olsen, and Santiago Velez-Ferro. Open configuration options The Market Design Approach to Teacher Assignment: Evidence from Ecuador. Inter-American Development Bank, September 2021. http://dx.doi.org/10.18235/0003824.

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We study the advantages, trade-offs, and challenges of employing a centralized rule to determine the allocation of teachers to schools. Data come from the centralized teacher assignment program in Ecuador, "Quiero ser Maestro," conducted by the Ministry of Education. Notably, in 2019 the program transitioned from a priority based algorithm to a strategy proof mechanism, similar to the change introduced in Boston in 2005 to assign students to schools. Using the reported preferences, we conduct a counterfactual analysis and nd substantive evidence that the adjustment in algorithm resulted in greater efficiency for the school system. However, in contrast to the Boston case, we nd the benefits stem from increasing the competition for positions among teachers, rather than by the introduction of a strategy-proof mechanism.

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Hegarty-Craver, Meghan, Hope Davis-Wilson, Pooja Gaur, Howard Walls, David Dausch, and Dorota Temple. Wearable Sensors for Service Members and First Responders: Considerations for Using Commercially Available Sensors in Continuous Monitoring. RTI Press, February 2024. http://dx.doi.org/10.3768/rtipress.2024.op.0090.2402.

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Wearable sensors (“wearables”) provide a mechanism to monitor the health of service members and first responders continuously and remotely. Several wearables are commercially available, with different configurations, sensors, algorithms, and forms of communication. Choosing the “best” wearable depends on the information you need to make decisions, how often you need this information, and the level of accuracy required. In this article, we review six use cases for wearables that are relevant to the military and first responders. We examine the metrics measured and the wearables used. We conclude with recommendations for requirements and wearable selection given the constraints imposed by various use cases.

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PANARIN, IGOR. Further development of innovative applications based on the inverse piezoelectric effect. Intellectual Archive, February 2024. http://dx.doi.org/10.32370/iaj.3031.

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As practice has shown, piezoelectric motors operating on the principles of the inverse piezoelectric effect can serve as the foundation for cutting-edge automation and precision mechanics systems, as well as innovative lighting technology. Designers are particularly interested in the potential to develop systems and configurations of precise and compact stepper motors based on the inverse piezoelectric effect. As demands for precision and weight reduction in such motors become increasingly stringent, particularly with the aim of reducing overall dimensions, a growing number of options and technical solutions based on the integrated use of specialized composite materials are being proposed as the foundational materials for constructing the components and structures of these motors.

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Reyes Díaz, Carlos Humberto. Working Paper PUEAA No. 8. CPTPP. Legal Trends. Universidad Nacional Autónoma de México, Programa Universitario de Estudios sobre Asia y África, 2022. http://dx.doi.org/10.22201/pueaa.006r.2022.

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Free trade areas (and customs unions) were established in a multilateral level since in Article XXIV of the GATT, and that is the legal minimum from which preferential trade agreements are now built. Some say CPTPP is part of a new generation of Free Trade Agreements because it goes deeper in the integration process. The CPTPP Agreement is a 584-page treaty, a very extensive legal instrument with 30 chapters, so when we talk about legal trends it refers to all 30 chapters at first. But it’s not the idea to explain every chapter in this text, not even just the dispute mechanisms, but the legal highlights that make the CPTPP an example of the new structure in international trade law. The CPTPP’s new chapters constitute the actual trade agenda and establish a minimum level of protection on topics not specially linked to trade, but which are now essential to talk about a new configuration of trade agreements, such as investments, intellectual property, e-commerce, among others

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Christie, Benjamin, Jordan Klein, Anton Netchaev, and Garry Glaspell. Integrating MOVEit motion constraints on a novel robotic manipulator. Engineer Research and Development Center (U.S.), November 2023. http://dx.doi.org/10.21079/11681/47845.

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MOVEit, a widely used Robot Operating System framework, plans composite tasks, where the high-level sequence of actions is fixed and known in advance. However, these tasks need to be tailored and adapted to the environmental context. This framework uses custom trajectory planners, known as controllers, to solve goals that are fully defined within the configuration space. Libraries, such as the Open Motion Planning Library, provide a collection of motion planners that can solve task-space goals. An exact spatial and joint replication of the robotic manipulator’s mechanics, typically Universal Robot Description Format and Semantic Robot Description Format files, is required. Common arms such as the Panda-Manipulator and OpenMANIPULATOR-X provide these files in their respective public repositories, but custom arms require significant modification or even a complete rewrite of these files.

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JINGTING, ZHANG. Further development of innovative applications based on the inverse piezoelectric effect. Intellectual Archive, March 2024. http://dx.doi.org/10.32370/iaj.3051.

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As practice has shown, piezoelectric motors based on the principles of the inverse piezoelectric effect can become the basis for the latest automation systems and precision mechanics, as well as innovative lighting technology; The main interest of developers of our company is the possibility of building on the basis of the inverse piezoelectric effect of systems and configurations related to the systems of precision and small-sized stepper motors As the requirements for accuracy and weight reduction of such engines become stricter, including by reducing overall dimensions, more and more variants and technical solutions based on the complex application of special composite materials are offered as a base material for building elements and structures of such engines. In modern electronic equipment, especially mass-produced, it is extremely important to correctly determine the initial technical requirements for the product, which in the process of production and operation should allow to carry out innovative modification of the product without changing the fundamental basis of its design, circuit solutions and combination of materials and component parts.

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Lohrberg, Arne. Electromagnetic resistivity anomalies in Tunnel Valleys: Potential for hidden offshore groundwater? (ENTRAP) - Cruise No. AL611, 22.04.2024 – 06.05.2024, Kiel – North Sea – Kiel (Germany). GEOMAR Helmholtz Centre for Ocean Research Kiel, 2024. http://dx.doi.org/10.3289/cr_al611.

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The role of large subsurface landforms produced during glaciations of the Pleistocene is still poorly understood with respect to groundwater flow. In particular, so-called tunnel valleys (TVs) formed beneath ice sheets acted as drainage systems of glacial meltwater. Due to their mechanism of formation, the fill of buried TVs often consists of highly permeable sands and gravels in their lower part and fine-grained deposits at their top. Such a configuration promotes their role as preferential flow pathways for groundwater sealed from the saltwater above. To understand the role of TVs for offshore freshened groundwater (OFG) in the southeastern North Sea, the objective of this cruise was to collect marine controlled-source electromagnetic data to answer the following questions: (1) Does the distribution of electrical resistivities indicate the presence of freshened groundwater in the subsurface between Amrum and Heligoland? and (2) Can we delineate different resistivity distributions inside tunnel valleys? To answer these questions, we acquired 320 km of time-domain controlled-source electromagnetic (TD-CSEM) profiles using the surface-towed SWAN system. These data will be inverted using MARE2DEM to produce a resistivity distribution to assess the salinity distribution in the subsurface. Additionally, we acquired 888 km of sediment profiling data using the hull-mounted Innomar SES2000 parametric echosounder. On this basis, we identified multiple channels in the subsurface that will be analysed for a paleolandscape reconstruction as part of project TRAPA. (Alkor-Berichte, AL611)

Стилі APA, Harvard, Vancouver, ISO та ін.

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