scholarly journals Design of a Flexible Capture Mechanism Inspired by Sea Anemone for Non-cooperative Targets

2021 ◽  
Vol 34 (1) ◽  
Author(s):  
Jiankun Yang ◽  
Chengwei Ren ◽  
Chenghao Yang ◽  
Youyu Wang ◽  
Shumin Wan ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Moving Target ◽  
Sea Anemones ◽  
Positioning Control ◽  
Unstructured Environments ◽  
Capture Mechanism ◽  
End Effectors ◽  
The Individual ◽  
Actuation Systems ◽  
The Continuum

AbstractRobotic grippers have been used in industry as end-effectors but are usually limited to operations in pre-defined workspace. However, few devices can capture irregularly shaped dynamic targets in space, underwater and other unstructured environments. In this paper, a novel continuum arm group mechanism inspired by the morphology and motions of sea anemones is proposed. It is able to dissipate and absorb the kinetic energy of a fast moving target in omni-direction and utilize multiple arms to wrap and lock the target without accurate positioning control. Wire-driven actuation systems are implemented in the individual continuum arms, achieving both bending motion and stiffness regulation. Through finite element method, the influence of different configurations of the continuum arm group on the capture performance is analyzed. A robotic prototype is constructed and tested, showing the presented arm group mechanism has high adaptability to capture targets with different sizes, shapes, and incident angles.

ГЕРМЕНЕВТИКА ЛИЧНОСТИ КАК МЕТОД СОВРЕМЕННОЙ ПЕРСОНОЛОГИИ

1970 ◽  
Vol 6 (1) ◽  
pp. 32-42
Author(s):  
Елена Старовойтенко
Keyword(s):  
Text Setting ◽  
Research Setting ◽  
Textual Representations ◽  
General Scientific ◽  
Definition Of ◽  
The Individual ◽  
The Continuum

Персонологическая интерпретация текстов предполагает реализацию общенаучных, а также специфических для персонологии, герменевтических установок, к которым относятся: установка на интерпретацию текста как исследование, установка на разнообразие герменевтических действий с текстом, установка на выявление неисследованных содержаний текста, установка на творческое постижение тайн текста, установка на целостное отношение к личности и "Я" автора текста, установка на выявление способности автора быть "практикующим феноменологом", установка на определение места изучаемого текста в континууме текстовых репрезентаций "личности", установка на соотнесение своего понимания текста с другими интерпретациями и их интеграцию, установка на раскрытие сущности авторской "идеи личности", возможное только в единстве интерпретаций, установка на построение и применение герменевтической модели, определяющей процедуру интерпретации как исследования и творчества, установка на определение места проделанного герменевтического поиска в культуре познания и жизни личности, установка на интерпретацию различных видов "текстов личности". Personological interpretation of texts suggests the implementation of the general scientific and also hermeneutical settings specific for Personology which include the setting of the interpretation of the text as a research, setting of a variety of hermeneutical actions with the text, setting to identify unexplored contents of the text, setting of the creative comprehension of the mysteries of the text, setting of the integrity of the attitude of the individual and the "I" of the author of the text, setting to reveal the author's ability to be "practicing phenomenologist", setting of the definition of the place in the text in the continuum of textual representations of the "personality", setting in the correlation of the understanding of the text with other interpretations and their integration, setting of the disclosure of the author's "ideas person" is possible only in the unity of interpretation, setting of the construction and usage of hermeneutical models defining the procedure for the interpretation of both studies and work, the setting to determine the place of hermeneutical research in culture and knowledge of a person's life, setting of the interpretation of various types of "texts of the individual."

THE ATOMIC FINITE ELEMENT METHOD AS A BRIDGE BETWEEN MOLECULAR DYNAMICS AND CONTINUUM MECHANICS

2011 ◽  
Vol 03 (01n02) ◽  
pp. 39-47 ◽  
Author(s):  
R. NEUGEBAUER ◽  
R. WERTHEIM ◽  
U. SEMMLER
Keyword(s):  
Finite Element Method ◽  
Molecular Dynamics ◽  
Finite Element ◽  
High Performance ◽  
Cutting Tools ◽  
Deposition Process ◽  
Dislocation Behavior ◽  
Crystal Plasticity Fem ◽  
The Continuum ◽  
Element Method

On cutting tools for high performance cutting (HPC) processes or for hard-to-cut materials, there is an increased importance in so-called superlattice coatings with hundreds of layers each of which is only a few nanometers in thickness. Homogeneity or average material properties based on the properties of single layers are not valid in these dimensions any more. Consequently, continuum mechanical material models cannot be used for modeling the behavior of nanolayers. Therefore, the interaction potentials between the single atoms should be considered. A new, so-called atomic finite element method (AFEM) is presented. In the AFEM the interatomic bonds are modeled as nonlinear spring elements. The AFEM is the connection between the molecular dynamics (MD) method and the crystal plasticity FEM (CPFEM). The MD simulates the atomic deposition process. The CPFEM considers the behavior of anisotropic crystals using the continuum mechanical FEM. On one side, the atomic structure data simulated by MD defines the interface to AFEM. On the other side, the boundary conditions (displacements and tractions) of the AFEM model are interpolated from the CPFEM simulations. In AFEM, the lattice deformation, the crack and dislocation behavior can be simulated and calculated at the nanometer scale.

The Strain of a Plane Sampleat the Homogeneous Field of the Strain Rates under the Plane Strain Conditions

2019 ◽  
Vol 945 ◽  
pp. 857-865
Author(s):  
A.L. Grigorieva ◽  
Y.Y. Grigoriev ◽  
A.I. Khromov
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Numerical Methods ◽  
Strip Thickness ◽  
Homogeneous Field ◽  
Strain Rates ◽  
The Finite Element Method ◽  
Strain Fields ◽  
Strain Tensors ◽  
The Continuum

In this paper, we obtained analytical solutions of the fields of strain tensors under uniaxial tension of a rigidplasticstrip underthe conditions of a plane stress state.The topicalityof the construction of these solutions is connected with significant difficulties in determining the strain fields by numerical methods (for example, the finite element method).In the construction of these solutions, the change in the geometric characteristics of the strip (thickness, width) was taken into account, which led to the solution of the nonlinear problem of the continuum mechanics.

scholarly journals Dissecting the EUV Spectrum of Capella

1996 ◽  
Vol 152 ◽  
pp. 105-112 ◽  
Author(s):  
Nancy S. Brickhouse
Keyword(s):  
Extreme Ultraviolet ◽  
Emission Measure ◽  
Continuous Distribution ◽  
Line Emission ◽  
Local Maximum ◽  
Abundance Ratio ◽  
Emission Lines ◽  
Cool Star ◽  
The Individual ◽  
The Continuum

Extreme ultraviolet spectra of Capella, obtained at various orbital phases over the past two years by the EUVE satellite, show strong emission lines from a continuous distribution of temperatures (~ 105 − 107.3 K). In addition to the strong He II λ303.8, the spectra are dominated by emission lines of highly ionized iron. Strong lines of Fe IX, XV, XVI, and XVIII–XXIV are used to construct emission measure distributions for the individual pointings, which show several striking features, including a minimum near 106 K and a local maximum at 106.8 K. Furthermore, intensities of the highest temperature lines (Te > 107 K) show variations (factors of 2–3) at different orbital phases, while the lower temperature Fe lines show variations of about 30% or less. The low variability of most of the strong low temperature features motivates a detailed analysis of the summed spectrum. With ~ 280 ks of total exposure time, we have measured over 200 emission features with S/N ≥ 3.0 in the summed spectrum. We report here initial results from the analysis of this spectrum. We can now identify lines of Fe VIII and X–XIV, as well as a number of electron density and abundance diagnostic lines.We also report here the first direct measurement of the continuum flux around ~ 100 Å in a cool star atmosphere with EUVE. The continuum flux can be predicted from the emission measure model based on Fe line emission, and demonstrates that the Fe/H abundance ratio is close to the solar photospheric value.

scholarly journals Modeling spatial navigation in the presence of dynamic obstacles: a differential games approach

2018 ◽  
Vol 119 (3) ◽  
pp. 990-1004 ◽  
Author(s):  
Anuja Darekar ◽  
Valery Goussev ◽  
Bradford J. McFadyen ◽  
Anouk Lamontagne ◽  
Joyce Fung
Keyword(s):  
Experimental Data ◽  
Differential Games ◽  
Dynamic Interactions ◽  
Obstacle Circumvention ◽  
Locomotor Strategy ◽  
Model Components ◽  
The Individual ◽  
Healthy Participants ◽  
Moving Obstacle ◽  
The Continuum

Obstacle circumvention strategies can be shaped by the dynamic interaction of an individual (evader) and an obstacle (pursuer). We have developed a mathematical model with predictive and emergent components, using experimental data from seven healthy young adults walking toward a target while avoiding collision with a stationary or moving obstacle (approaching head-on, or diagonally 30° left or right) in a virtual environment. Two linear properties from the predictive component enable the evader to predict the minimum distance between itself and the obstacle at all times, including the future intersection of trajectories. The emergent component uses the classical differential games model to solve for an optimal circumvention while reaching the target, wherein the locomotor strategy is influenced by the obstacle, target, and the evader velocity. Both model components were fitted to a different set of experimental data obtained from five poststroke and healthy participants to derive the minimum predicted distance (predictive component) and obstacle influence dimensions (emergent component) during circumvention. Minimum predicted distance between evader and pursuer was kept constant when the evader was closest to the obstacle in all participants. Obstacle influence dimensions varied depending on obstacle approach condition and preferred side of circumvention, reflecting differences in locomotor strategies between poststroke and healthy individuals. Additionally, important associations between model outputs and observed experimental outcomes were found. The model, supported by experimental data, suggests that both predictive and emergent processes can shape obstacle circumvention strategies in healthy and poststroke individuals.NEW & NOTEWORTHY Obstacle circumvention during goal-directed locomotion is modeled with a new mathematical approach comprising both predictive and emergent elements. The major novelty is using differential games solutions to illustrate the dynamic interactions between the individual as an evader and the approaching obstacle as a pursuer. The model is supported by experimental evidence that explains the behavior along the continuum of locomotor adaptation displayed by healthy subjects and individuals with stroke.

scholarly journals The Epic Mania: Pound’s Response to E. A. Poe and T. Hulme

2021 ◽  
pp. 32-42
Author(s):  
Oleksandr Gon
Keyword(s):  
Modern Poetry ◽  
Specific Component ◽  
Epic Tradition ◽  
The World ◽  
The Creation ◽  
The Cantos ◽  
The Individual ◽  
The Continuum

The article is devoted to the analysis of a specific component in the post-epic artistic picture of the world contextualized in the genre experiments with epic forms that symbolize the search for new ways to express the substantial unity of the individual with a society. It is important that in «The Poetic Principle» (1850) Poe appeals to the epic tradition and expresses an essential thesis about the paradigm of the epic and the lyrical in precedent texts and mentions a significant lyrical inderpinning in Homer's Iliad. In «A Lecture on Modern Poetry» (1908), Hume posits that the very assumption that in modern poetry there will appear an artist capable of synthesizing all the experience of modern peroson in the form of a great epic is an utter misunderstanding of the tendencies in modern poetry. Both Pound and Yuri Klen consider the creation of a modern epic in the coordinates of the continuum of the national poetic canon. The concept of «return» constitutes an omnipresent aesthetic program of the Pound’s epic. The poetics of repetitions in the Cantos is based on the versification models of the European fixed poetic forms that are extensively represented against the background of new emphases and reformatting of the ancient epic forms, making new their conventions and motives. Creative and receptive aspects of the innovative application of specific features in the epic composition (recurrent historical plots, the νόστος topos) deeply correlate with the artistic form of the modern epic.

scholarly journals SYNTACTIC SYNONYMY AS ONE OF THE PECULIARITIES OF AUTHOR’S IDIOSTYLE (based on French fiction of the XXth – the beginning of the XXIst centuries)

2021 ◽  
Author(s):  
А. Lepetiukha
Keyword(s):  
Primary Structure ◽  
General Tendency ◽  
Inverse Reconstruction ◽  
Language Discourse ◽  
Structural Types ◽  
Cognitive Space ◽  
Conditional Structures ◽  
The Individual ◽  
The Continuum

In this article the syntactic synonyms as one the characteristics of the author’s idiostyle are defined as the co(n)textually preferential options formed in the continuum language → discourse as a result of the phased phenomenological cognitive polyoperations at the levels of primary and secondary consciousness: destruction and reconstruction of being and its structures and categories → sublinguistic schemes → primary (pivotal) structures → secondary reduced, extended and quantitatively equacomponential one-basis and two-basis synonymic transforms. Transformational processes and the primary structure are revealed by means of the procedure of inverse reconstruction (discourse → language). The author’s idiostyle is considered as the correlation of different degree of individual and collective cognitive spaces that conditions the choice and actualization of some synonymic structures. Three types of author’s idiostyle are distinguished: 1) diffuse (dominance of the collective cognitive space over the individual one which is revealed through the realization of synonymic structures characteristic to a certain epoch; 2) personal (prevalence of the individual cognitive space over the collective one, that is the actualization of grammaticalized synonymic utterances appropriate for another epoch, of typical agrammaticalized synonymic structures characteristic to another epoch or non-characteristic to the described epoch, of non-typical agrammaticalized synonymic structures. The french writer’s idiostyle of the XXth – the beginning of the XXIst centuries is analyzed using the examples of different semantic-structural types of synonymic preferential options (reduced mono- and polypredicative constructions with the participial and gerundial head lexemes, asyndetic conditional structures and extended with the predicates and presentatives synonymic structures) and it is proved the coexistence of two phenomena: reduction and extension in the modern French fiction despite of the general tendency of the economy of means of expression of author’s thought

scholarly journals Influence of the Shape of Gear Wheel Bodies in Marine Engines on the Gearing Deformation and Meshing Stiffness

2021 ◽  
Vol 9 (10) ◽  
pp. 1060
Author(s):  
Silvia Maláková ◽  
Michal Puškár ◽  
Peter Frankovský ◽  
Samuel Sivák ◽  
Daniela Harachová
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Load Capacity ◽  
Gear Wheel ◽  
Spur Gear ◽  
The Finite Element Method ◽  
Meshing Stiffness ◽  
Marine Engines ◽  
The Individual ◽  
Body Parameters

The basic properties of gears must be considered: the shape of their gearing, their load capacity, and the meshing stiffness, which affects the noise and vibration. When designing large gears, it is important to choose the correct shape of the gear body. Large gears used in marine gearboxes must be designed with as little weight as possible. The requirements of sufficient stiffness of the gear wheel body, as well as the meshing stiffness, must be met. This paper is devoted to the influence of spur gear wheel body parameters on gearing deformation and meshing stiffness. The stiffness of the gear is solved on the basis of the deformation of the gearing teeth, which is determined by the finite element method. Examples of the simulation and subsequent processing of results demonstrates how the individual parameters of the gear wheel body influence the stiffness of the gearing teeth. At the same time, the results point to designs of suitable shape and dimensions to achieve the required stiffness of the gearing teeth, but with the lowest possible weight of the spur gear wheel body.

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