scholarly journals Tactile Whole-Field Imaging Sensor on Photoelasticity

2007 ◽  
Author(s):  
Venketesh N. Dubey ◽  
Gurtej S. Grewal
Keyword(s):  
Phase Shifting ◽  
Sensing Applications ◽  
Shear Loads ◽  
Photoelastic Effect ◽  
Low Modulus ◽  
Fringe Patterns ◽  
Imaging Sensor ◽  
Field Imaging ◽  
New Strategies

The paper describes a whole-field imaging sensor developed on the principles of photoelasticity. The sensor produces colored fringe patterns when load is applied on the contacting surface. These fringes can be analyzed using conventional photoelastic techniques, however, as the loading in the present case is not conventional some new strategies need to be devised to analyze the load imprint. The loading is unconventional in the sense that low modulus photoelastic material is deformed under vertical load in the direction of light travel to induce the photoelastic effect. The paper discusses the efficacy of both RGB calibration and phase shifting techniques in sensing applications. The characteristics of fringe patterns obtained under vertical and shear loads have been studied and the results obtained under these conditions are discussed with their limitations specifically when this is applied for sensing applications. Finally a case study has been conducted to analyze a foot image and conclusions drawn from this have been presented.

scholarly journals Photoelastic Stress Analysis Under Unconventional Loading

2007 ◽  
Author(s):  
Venketesh N. Dubey ◽  
Gurtej S. Grewal
Keyword(s):  
Stress Analysis ◽  
Phase Shifting ◽  
Vertical Load ◽  
Sensing Applications ◽  
Shear Loads ◽  
Photoelastic Effect ◽  
Low Modulus ◽  
Photoelastic Stress ◽  
Fringe Patterns

This paper presents use of conventional photoelastic techniques under unconventional loading situations to evaluate their efficacy in sensing applications. The loading is unconventional in the sense that low modulus photoelastic material is deformed under vertical load in the direction of light travel to induce the photoelastic effect. This is atypical of conventional methods where loading is across the light travel. Both RGB calibration and phase shifting techniques have been used to study the characteristics of fringe patterns obtained under vertical and shear loads. The results obtained under these conditions are discussed with their limitations specially when this is applied for sensing applications. Finally a case study has been conducted to analyze the foot image and conclusions drawn from this have been presented.

scholarly journals GESTÃO AMBIENTAL NAS ORGANIZAÇÕES DA QUARTA COLÔNIADOI:10.5773/rgsa.v4i1.222

2010 ◽  
Vol 4 (1) ◽  
pp. 214
Author(s):  
Kleiton Douglas Saggin ◽  
Renata Gonçalves Rodrigues ◽  
Andréa Polidori Célia ◽  
Paloma de Mattos ◽  
Tânia Nunes da Silva
Keyword(s):  
Economic Growth ◽  
Environmental Management ◽  
Development Strategy ◽  
Environmental Law ◽  
Environmental Issues ◽  
Qualitative Approach ◽  
Structured Interviews ◽  
Environmental Practices ◽  
New Strategies

A reflexão sobre as práticas ambientais, em um contexto marcado pela degradação permanente do meio ambiente e do seu ecossistema, tem exigido novas posturas das organizações. Contudo, adotar a gestão ambiental como estratégia de desenvolvimento, contempla as necessidades das organizações em aliar crescimento econômico e sustentabilidade. Neste sentido, este artigo tem como objetivo identificar se existe a preocupação com as questões ambientais por parte das organizações da região da Quarta Colônia e se as mesmas adotam programas de gestão ambiental, analisando fatores que podem influenciar nas diferentes abordagens dadas ao tema. Para atingir o objetivo proposto, utilizou-se uma abordagem qualitativa em um estudo considerado exploratório e compreendido como estudo de caso. A amostra foi de cinco organizações da Região da Quarta Colônia onde foram realizadas visitas técnicas e entrevistas semi-estruturadas. Como resultado significativo do estudo, pôde se constatar que as organizações estudadas limitam-se apenas às exigências da legislação ambiental em vigor. Assim as organizações necessitam adotar novas posturas e um processo de atualização contínua que pode ser viabilizado pela gestão ambiental. Palavras-chave: Gestão ambiental; Quarta Colônia; organizações; desenvolvimento. Abstract The reflection about environmental practices, in a context marked by permanent degradation of the environment and its ecosystem, has required new strategies from the organizations. However, adopting environmental management as a development strategy satisfies the organizations needs to gather economic growth and sustainability. Thus, this paper aims on identifying whether the organizations from the Quarta Colonia Region are concerned about environmental issues and whether they adopt environmental management programs, analyzing aspects which can influence the different approaches applied to this issue. In order to reach such aim, a qualitative approach was used in a study considered exploratory and comprised as a case study. The sample consisted of five organizations from the Quarta Colonia Region where there were technical visits and semi-structured interviews. A relevant result of the study was that it was possible to observe that the studied organizations are restricted only to the operative environmental law requirements. Thus, organizations ought to adopt new emplacements and a continuous updating process, which can become viable through the environmental management. Keywords: Environmental management; Quarta Colônia; organizations; development

Developments in the Application of the Grid Method to Dynamic Problems

1959 ◽  
Vol 26 (4) ◽  
pp. 629-634
Author(s):  
A. J. Durelli ◽  
J. W. Dally ◽  
W. F. Riley
Keyword(s):  
Dynamic Stress ◽  
Grid Method ◽  
Circular Disk ◽  
Model Material ◽  
Dynamic Problems ◽  
Principal Stresses ◽  
Stress Studies ◽  
Low Modulus ◽  
Fringe Patterns ◽  
Dynamic Loading Conditions

Abstract The objective of the research reported in this paper was to develop the grid method further for use in dynamic-stress studies. A rubber-thread grid network in a low-modulus model material (a urethane rubber known as Hysol 8705) was used in conjunction with a microflash light source to record grid distortions and photoelastic fringe patterns in a model subjected to dynamic-loading conditions. By considering a strut subjected to axial impact it was possible to establish that the static and dynamic values of Poisson’s ratio were identical, and the strain-fringe value of the material varied with strain rate. In addition, stresses in the axial and transverse directions were determined along the center line of the strut. Finally, the methods established were applied to the problem of a circular disk subjected to diametrical impact and both principal stresses were determined along a vertical diameter at one instant during impact.

Modifiable Silicones for Harsh Environments

2011 ◽  
Vol 2011 (1) ◽  
pp. 000090-000098 ◽  
Author(s):  
Michelle Velderrain ◽  
Matthew Lindberg
Keyword(s):  
Elevated Temperatures ◽  
Electronic Devices ◽  
Polymeric Materials ◽  
Harsh Environments ◽  
Electrically Conductive ◽  
Polymeric Systems ◽  
Low Modulus ◽  
Conductive Fillers ◽  
Processing Techniques

Silicones have been used for decades in aerospace and other harsh environments where temperature extremes are common. As the level of sophistication increases for electronic devices to serve these industries where failure is not an option, the material supplier has to also be able to meet these needs. Silicones are polymeric materials composed primarily of repeating silicon and oxygen bonds, known as siloxanes, which can be optimized for various chemical and physical properties by incorporating different organic groups onto the silicon atom. Employing advanced processing techniques to the siloxane system can also greatly reduce mobile siloxane molecules to reduce contamination that can cause electronic failures during assembly or operation. Siloxane based polymeric systems are also unique polymers compared to standard organic based materials in that they have a large free volume that imparts a low modulus which absorbs stresses during thermal cycling as well as not degrading at continuous operating temperatures up to 250 C. They are also slightly polar which allows the incorporation of fillers to impart a variety of unique properties. Filler technology is also a rapidly growing enterprise where fillers with various particle sizes and shapes can be added to silicones to impart key properties such as maintaining electric conductivity at elevated temperatures. This paper will explain fundamentals of silicone chemistry and processing related to getting the optimal performance in harsh environments. A case study comparing two different electrically conductive fillers and how they can influence the electrical conductivity at elevated temperatures will be presented.

Wide-angle lenses distortion calibration using phase demodulation of phase-shifting fringe-patterns

2020 ◽  
Vol 49 (6) ◽  
pp. 20200039
Author(s):  
周维帅 Weishuai Zhou ◽  
翁嘉文 Jiawen Weng ◽  
彭军政 Junzheng Peng ◽  
钟金钢 Jingang Zhong
Keyword(s):  
Phase Shifting ◽  
Wide Angle ◽  
Fringe Patterns ◽  
Phase Demodulation

Wide-angle lenses distortion calibration using phase demodulation of phase-shifting fringe-patterns

2020 ◽  
Vol 49 (6) ◽  
pp. 20200039
Author(s):  
周维帅 Weishuai Zhou ◽  
翁嘉文 Jiawen Weng ◽  
彭军政 Junzheng Peng ◽  
钟金钢 Jingang Zhong
Keyword(s):  
Phase Shifting ◽  
Wide Angle ◽  
Fringe Patterns ◽  
Phase Demodulation

scholarly journals MEASURING THE EFFECT OF SOCIAL NETWORKING, ORGANIZATIONAL CULTURE TOWARD EMPLOYEE ENGAGEMENT IN SOES ORGANIZATION: CASE STUDY OF SOES IN INDONESI

2020 ◽  
pp. 181
Author(s):  
Victor Wiley ◽  
Thomas Lucas
Keyword(s):  
Organizational Culture ◽  
Social Networking ◽  
Employee Engagement ◽  
Employee Performance ◽  
Business Climate ◽  
Private Organization ◽  
New Strategies

SOEs in Indonesia has been expanded their project with tight time and more challenged business climate. In fact, similar to private organization, SOEs also faced with employee performance in their projects. The employee performance has many aspects of social networking, organizational culture and employee engagement. This study tested the influence of social networking, organizational culture and employee engagement on in several projects which ventured by State Owned Enterprises in Indonesia. The variables are analyzed by using SEM AMOS. It is explained that social networking, organizational culture and employee engagement affect employee engagement in SOEs-based projects in Indonesia. This study suggested an approach to improve social networking, organizational culture and employee engagement as new strategies for SOEs in Indonesia. This study result can be a recommendation to the SOEs managers to maintain social networking, organizational culture and employee engagement in order their project to be manageable.

scholarly journals Application of Modal-Displacement Based Design Method to Multi-Story Timber Blockhaus Structures

2020 ◽  
Vol 10 (11) ◽  
pp. 3889
Author(s):  
Martina Sciomenta ◽  
Vincenzo Rinaldi ◽  
Chiara Bedon ◽  
Massimo Fragiacomo
Keyword(s):  
Design Method ◽  
Fe Model ◽  
Structural Elements ◽  
Base Shear ◽  
Shear Loads ◽  
Story Drift ◽  
Displacement Based ◽  
Technical Interest ◽  
Wooden Structures

Structures under seismic excitation undergo different inter-story drift levels that can be associated to damage of both structural and non-structural elements, and thus to the expected losses. The Modal-Displacement Based Design (DBD) procedure, in this regard, has been developed to fix major issues of Force Based Design (FBD) approaches, thus to design multi-story buildings in which the inter-story drift can allow one to control damage mechanisms. In this paper, the conventional Modal-DBD methodology is applied to multi-story timber buildings constructed using the Blockhaus technology. Given their intrinsic geometrical and mechanical features (i.e., stacking of logs, door/window openings, gaps and friction mechanisms, etc.), dedicated methods of analysis are required for them, compared to other wooden structures. A three-story case-study Blockhaus system of technical interest is thus presented for the assessment of Modal-DBD calculation steps. As shown, special care must be spent for the selection of convenient inter-story drift limits that in general should reflect the characteristics of the examined structural typology. The backbone parameters are thus collected for each shear-wall composing the 3D Blockhaus building, based on refined Finite Element (FE) analyses of separate log-walls. The overall results of the Modal-DBD process are thus finally assessed by means of a Push-Over (PO) analysis, carried out on a simplified 3D FE model of the examined multi-story structure. The comparison of FE predictions, as shown, demonstrates that reliable estimates can be obtained when the Modal-DBD procedure is applied to timber Blockhaus systems. In particular, base shear loads can be estimated with good accuracy, while the corresponding top displacements are slightly overestimated (with up to +10%–14% the expected values, for the collapse prevention performance level).

Sign in / Sign up

Export Citation Format

Share Document