scholarly journals Spatial Cognition of the Visually Handicapped: Case Study of Geometric Model Spaces with a Center Core

2006 ◽  
Vol 5 (1) ◽  
pp. 113-120 ◽  
Author(s):  
Yoshihiro Kametani ◽  
Junko Kishigami ◽  
Kokichi Chibana
Keyword(s):  
Spatial Cognition ◽  
Geometric Model ◽  
Model Spaces ◽  
Visually Handicapped

scholarly journals An Optimization Workflow in Design for Additive Manufacturing

2021 ◽  
Vol 11 (6) ◽  
pp. 2572
Author(s):  
Stefano Rosso ◽  
Federico Uriati ◽  
Luca Grigolato ◽  
Roberto Meneghello ◽  
Gianmaria Concheri ◽  
...  
Keyword(s):  
Additive Manufacturing ◽  
Structural Optimization ◽  
Geometric Model ◽  
Complex Geometries ◽  
Design Phase ◽  
Design For Additive Manufacturing ◽  
Engineering Software ◽  
Embodiment Design ◽  
Pros And Cons

Additive Manufacturing (AM) brought a revolution in parts design and production. It enables the possibility to obtain objects with complex geometries and to exploit structural optimization algorithms. Nevertheless, AM is far from being a mature technology and advances are still needed from different perspectives. Among these, the literature highlights the need of improving the frameworks that describe the design process and taking full advantage of the possibilities offered by AM. This work aims to propose a workflow for AM guiding the designer during the embodiment design phase, from the engineering requirements to the production of the final part. The main aspects are the optimization of the dimensions and the topology of the parts, to take into consideration functional and manufacturing requirements, and to validate the geometric model by computer-aided engineering software. Moreover, a case study dealing with the redesign of a piston rod is presented, in which the proposed workflow is adopted. Results show the effectiveness of the workflow when applied to cases in which structural optimization could bring an advantage in the design of a part and the pros and cons of the choices made during the design phases were highlighted.

scholarly journals Virtual phyllotaxis and real plant model cases

2008 ◽  
Vol 35 (10) ◽  
pp. 1025 ◽  
Author(s):  
Beata Zagórska-Marek ◽  
Marcin Szpak
Keyword(s):  
Apical Meristem ◽  
Geometric Model ◽  
Ontogenetic Changes ◽  
Plant Model ◽  
Phyllotactic Pattern ◽  
Random Manner ◽  
Simulation Results ◽  
Unknown Signal ◽  
Real Plant

Phyllotactic pattern results from genetic control of lateral primordia size (physiological or physical) relative to the size of organogenic lateral surface of shoot apical meristem (SAM). In order to understand the diversity of patterns and ontogenetic transitions of phyllotaxis we have developed a geometric model allowing changes of the above proportion in a computer simulation of SAM’s growth. The results of serial simulations confirmed that many phyllotactic patterns (including most esoteric ones) and ontogenetic transitions known from real plant model cases can be easily obtained in silico. Properties of virtual patterns often deviated from those of ideal mathematical lattices but closely resembled those of the natural ones. This proved the assumptions of the model, such as initiation in the first available space or ontogenetic changes in primordia size, to be quite realistic. Confrontation of simulation results with some sequences of real phyllotactic patterns (case study Verbena) questions the autonomy of SAM in its organogenic activity and suggests the involvement of unknown signal positioning primordia in a non-random manner in the first available space.

scholarly journals 3D survey and virtual reconstruction of heritage. The case study of the City Council and Lonja of Alcañiz

2021 ◽  
Vol 6 (2) ◽  
pp. 12-25
Author(s):  
Marta Quintilla Castán ◽  
Luis Agustín Hernández
Keyword(s):  
Geometric Model ◽  
Current Data ◽  
City Council ◽  
Historical Knowledge ◽  
Semantic Hierarchy ◽  
Virtual Reconstruction ◽  
3D Geometric Model ◽  
The City ◽  
Support Decision Making

With current data acquisition techniques, exhaustive documentation of patrimonial goods is generated, which allows obtaining a 3D geometric model, on which data from research from research is generated. As in other fields of architecture, the latest graphic techniques and manipulation of the image, allow a working methodology other than the current one in the patrimonial field. The information systems have been evolving towards technologies developed with open source software, the use of standards, ontologies and the structuring of information and of the 3D model itself under a semantic hierarchy. Interoperability between databases is favored and the maintenance of applications is ensured. The purpose is to support decision-making related to the model and simultaneously, serve multiple purposes such as cataloging, protection, restoration, conservation, maintenance or dissemination, among others. The research carried out for the realization of the survey of the City Council and Lonja of Alcañiz (Teruel), has the aim of expanding the historical knowledge of the buildings and delimiting its possible constructive phases, in order to obtain the geometric reality of the buildings. In this way, provide greater instruments to carry out the drafting work of the set restoration project. 

URBAN SPATIAL COGNITION: A CASE STUDY OF GUANGZHOU, CHINA

1986 ◽  
Vol 7 (5) ◽  
pp. 397-412 ◽  
Author(s):  
Y. Lee ◽  
C. G. Schmidt
Keyword(s):  
Spatial Cognition

Lattice structure optimization and homogenization through finite element analyses

2020 ◽  
Vol 234 (12) ◽  
pp. 1490-1502 ◽  
Author(s):  
Florian Vlădulescu ◽  
Dan Mihai Constantinescu
Keyword(s):  
Fundamental Frequency ◽  
Lattice Structure ◽  
Geometric Model ◽  
Three Dimensional ◽  
Variable Density ◽  
Second Stage ◽  
Lattice Cell ◽  
Lattice Density ◽  
Homogenized Model

Lattice topology optimization can stimulate the design of new materials with spatially dependent properties with composite parts or three-dimensional printed components. The present work considers a mounting bracket for an industrial robotic arm as a case study, having as the main objective the increase of the fundamental frequency and secondly its mass reduction. Two design approaches were considered by using the ANSYS software: the first stage optimized the orthotropic lattice material by establishing an optimal variable cubic cell lattice density distribution in the geometric model; the second stage used a homogenized model based on the lattice optimization resulted from the previous stage and considered different volume fractions and variable density for four different types of cells. Homogenization increased the stiffness of the bracket by using the same cubic lattice cell and the fundamental frequency increased from 1227 Hz obtained with lattice optimization to 1366 Hz after homogenization. For the unoptimized bracket the fundamental frequency was only 839 Hz. The mass was reduced to more than half. The most effective proved to be the midpoint lattice cell as by homogenization the mass was reduced from 45.5 kg to 18.22 kg.

Spatial Cognition and Ecology: Hummingbirds as a Case Study

2017 ◽  
pp. 30-51
Author(s):  
Susan D. Healy ◽  
T. Andrew Hurly
Keyword(s):  
Spatial Cognition

scholarly journals Agent-Based Analysis of Urban Spaces Using Space Syntax and Spatial Cognition Approaches: A Case Study in Bari, Italy

2020 ◽  
Vol 12 (11) ◽  
pp. 4625
Author(s):  
Dario Esposito ◽  
Stefania Santoro ◽  
Domenico Camarda
Keyword(s):  
Spatial Cognition ◽  
Space Syntax ◽  
Urban Environments ◽  
Urban Spaces ◽  
Science Field ◽  
Agent Based ◽  
Planning Decisions ◽  
Configurational Analysis ◽  
Spatial Features

The present study provides a reflection on the agent-based intelligence of urban spatial environments through the comparison of a formal quantitative approach, i.e., space syntax, and a qualitative experimentation based on the spatial cognition approach. Until recently, space syntax was adopted by urban planners and designers to support urban design and planning decisions, based on an analysis of the urban physical environment. Researchers in the cognitive science field have increased their attempts to address space syntax techniques to better understand the relationships of cognitive spatial agents with the spatial features of urban environments. In this context, the experimental approach focuses on the qualities of the environment as interacted, perceived and interpreted by cognitive agents and reflects on the role which it plays in affecting spatial decisions and route choices. The present paper aimed to explore the extent to which possible integration between the different approaches can provide insights on agent-based decisions in actions and behavioural processes in space for useful perspectives in urban analysis and planning. Findings suggest relevant correlations between the experimentation results and space syntax predictions when a correspondence of some aspects can be found. Conversely, interesting qualitative insights from the spatial cognition approach are pointed out to enrich the configurational analysis. The potential and constraints of each approach and the ways of combining these are presented. Evidence supports the suitability of the proposal outlined in the present paper within the framework of urban planning practice.

A Geometric Model for Tolerance Analysis with Manufacturing Signature and Operating Conditions

2019 ◽  
Vol 9 (3) ◽  
pp. 1-13
Author(s):  
Wilma Polini ◽  
Andrea Corrado
Keyword(s):  
Concurrent Engineering ◽  
Manufacturing Process ◽  
Geometric Model ◽  
Tolerance Analysis ◽  
Operating Conditions ◽  
Geometric Reasoning ◽  
Assembly Sequence ◽  
Turning Process ◽  
Engineering Approach

In this work, a geometric model for tolerance analysis has been carried out. Geometric reasoning has been implemented in the model to simulate the manufacturing process and, then, the assembly sequence. The proposed geometric model has been applied to a case study consisting of two circular profiles due to the turning process, and a hollow rectangular box. The two circular profiles have been assembled inside the box by considering the gravity, and the friction among the parts and the actual points of contact with and without using the manufacturing signature. Matlab® software has been used to implement the geometric model for tolerance analysis. The results have been compared with those obtained by using a literature model with and without considering the manufacturing signature. This work aims to be a first step towards the integration of the design and the manufacturing in a concurrent engineering approach.

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