Fracture Discontinuities and Structural Analysis in Resource Recovery Endeavors

1978 ◽  
Vol 100 (1) ◽  
pp. 2-12 ◽  
Author(s):  
M. P. Cleary
Keyword(s):  
Structural Analysis ◽  
Energy Recovery ◽  
Physical Mechanism ◽  
Numerical Solutions ◽  
Innovative Design ◽  
Design Procedures ◽  
Geological Materials ◽  
Fracture Evolution ◽  
Current Trends ◽  
Standard Design

The need for redirection of investigative effort in the area of mineral and energy recovery is emphasized: more fundamental analytical descriptions must be linked to innovative design explorations if traditionally slow rates of methodology evolution are to accelerate reliably and ecologically toward a compensation for rapid depletion of readily available resources. An example of the problems to be resolved is provided in the form of a mechanism for failure by gradual fracture evolution: this involves substantial departure from predictions of conventional mechanics modelling and is traced to inherent instability among the constitutive features of representative geological materials. Major advances are needed, both in physically motivated formulations and tractable incorporation into computational schemes, before this unavoidable behavior can be confidently encompassed by standard design procedures; current trends indicate an excess desire to provide elaborate numerical solutions for superficially consistent models, although the essential physical mechanism is manifestly absent in the results. The practitioner can be encouraged to seek skilled scientific aid only if truly realistic simulations of his design application can actually be performed—development of that ability will require much logical rigor, engineering skill and ingenuity. Corresponding examples are suggested for other aspects of the general discipline, called thermomechanics, which is so central to the present resource crisis.

Deployability Conditions for Curved and Flat, Polygonal and Trapezoidal Deployable Structures

1993 ◽  
Vol 8 (1-2) ◽  
pp. 97-106 ◽  
Author(s):  
C.J. Gantes ◽  
R.D. Logcher ◽  
J.J. Connor ◽  
Y. Rosenfeld
Keyword(s):  
Structural Analysis ◽  
Regular Polygon ◽  
Geometric Design ◽  
Geometric Constraints ◽  
Design Criteria ◽  
Deployable Structures ◽  
Design Procedures ◽  
Curved Structures ◽  
Space Frames ◽  
Flat Structures

Prefabricated, deployable space frames that exhibit self-standing and stress-free states in both the deployed and collapsed configurations are investigated in this paper. This type of deployable structures shows considerable advantages as compared to previous designs that either required external stabilizing or had members with residual stresses in the deployed configuration. Following previous developments for flat deployable structures consisting of units with regular-polygon planviews, this study deals with flat structures made of trapezoidals, and curved structures assembled from regular-polygonal units. First, the general geometric constraints and deployability conditions for these units are formulated, and a methodology for using these constraints as geometric design criteria is presented. Furthermore, additional conditions for the assemblage of single units into larger structures are given. Then, structural analysis issues for this type of structures are discussed. The necessity of nonlinear analysis during deployment is emphasized. Finally, the above geometric design procedures are demonstrated with specific examples.

Design and Fabrication of a Palm Kernel Nut and Shell Separating Machine

2013 ◽  
Vol 824 ◽  
pp. 262-271
Author(s):  
John A. Akpobi ◽  
M.J. Omoregie
Keyword(s):  
Palm Kernel ◽  
Design Engineering ◽  
Mean Values ◽  
Design Procedures ◽  
Separation Time ◽  
Input Capacity ◽  
Standard Design ◽  
Manufacturing Methods ◽  
Overall Efficiency ◽  
Novel Design

This paper presents a novel design and fabrication of a palm kernel nut and shell separating machine to improve the turnout rate as well as the overall efficiency of the machine. Standard design procedures were adapted from Design Engineering text and hand books, in the specifications and computation of dimensions of various components of the machine. Seven repetitions were carried out in the measurements of input and separated nuts and shells as basis for computing mean values and efficiencies. The components of the kernel nut and shell separating machine were designed and fabricated from locally available materials using manufacturing methods explained in the paper. Suitable tests were done and the over-all performance was found to be satisfactory. The machine has an input capacity of 29.42 kg by weight, a mean separation time of 50.75 seconds and an overall efficiency of 96.59 %. This is a very simple and effective machine.

State of play: Video games and moral engagement

2019 ◽  
Vol 11 (3) ◽  
pp. 271-288 ◽  
Author(s):  
Dan Staines ◽  
Mia Consalvo ◽  
Adam Stangeby ◽  
Sâmia Pedraça
Keyword(s):  
Video Games ◽  
Moral Choice ◽  
Design Features ◽  
Innovative Design ◽  
Current Trends ◽  
Moral Engagement

In this article we examine three recent examples of ‘ethically notable games’ (Zagal 2010) and highlight unusual or innovative design features for facilitating moral engagement. Drawing on the work of Miguel Sicart to frame our analysis, our goal is to highlight current trends in ENG (ethically notable games) design and see how commercial games are moving beyond reductive ‘morality meters’ and treating moral choice with greater nuance, resulting ‐ for the most part ‐ in a more morally engaging experience.

Scientific Articles in Internet Homepages: Assumptions upon Lay Audiences

2003 ◽  
Vol 33 (2) ◽  
pp. 165-184 ◽  
Author(s):  
Isabel Gonzalez-Pueyo ◽  
Alicia Redrado
Keyword(s):  
Structural Analysis ◽  
Functional Approach ◽  
Genre Theory ◽  
The Internet ◽  
Linguistic Features ◽  
News Stories ◽  
Current Trends ◽  
Tv News ◽  
Scientific Technical ◽  
Modern Myth

This article studies a set of scientific/technical articles published in Internet homepages. Focusing upon current trends on genre theory and the functional approach deployed by Halliday and Martin [1], linguistic features and schematic structure are analyzed in relation to more standard genres. The structural analysis suggests that these kind of texts imaginatively realize and assume the standpoint and main tenets of a lay audience that just consumes specific genres, most being analogous to the persuasive, manipulative, amusement-oriented genres of TV news stories, tabloids, and commercials. It is pondered that much of the “technological utopianism” (term used by Kling [2] surrounding the ever increasingly standardized Internet discourse turns the Internet into a productive vehicle to sustain technoscience as modern myth by spreading and forging that utopian imagery into the audience's consciousness, and that scientists are taking fruitful advantage of the utopian, futurist, and often sensationalist accounts of the Internet as a formidable frame to advertise themselves and the deeds achieved in their laboratories.

Revision of DNV GL Design Standard for Floating Wind Turbine Structures

2017 ◽  
Author(s):  
Anne Lene Haukanes Hopstad ◽  
Knut O. Ronold ◽  
Kimon Argyriadis
Keyword(s):  
Wind Turbine ◽  
Oil And Gas ◽  
Oil And Gas Industry ◽  
Gas Industry ◽  
Floating Structures ◽  
Current Trends ◽  
Floating Wind Turbine ◽  
Standard Design ◽  
Offshore Oil And Gas ◽  
Offshore Oil

The first edition of the DNV Offshore Standard “Design of Floating Wind Turbine Structures”, DNV-OS-J103, was published in June 2013. The standard represented a condensation of all relevant requirements for floaters in existing DNV standards for the offshore oil and gas industry which were considered relevant also for offshore floating structures for support of wind turbines, supplemented by necessary adaptation to the wind turbine application. As part of the harmonization of the DNV GL codes for the wind turbine industry after the merger between Det Norske Veritas (DNV) and Germanischer Lloyd (GL) in the autumn of 2013, DNV GL currently plans to publish a revision of DNV-OS-J103 in 2017, to become identified as DNVGL-ST-0119. The new revision is intended to reflect the experience gained since 2013 as well as the current trends within the industry.

Innovative Structural Designs of Tankers Against Ship Collisions and Grounding: A Recent State-of-the-Art Review

2003 ◽  
Vol 40 (01) ◽  
pp. 25-33
Author(s):  
Jeom Kee Paik
Keyword(s):  
Oil Pollution ◽  
State Of The Art ◽  
Pollution Prevention ◽  
Innovative Design ◽  
Design Procedures ◽  
Design Concepts ◽  
Design Alternatives ◽  
Hull Design ◽  
Oil Tankers ◽  
Double Hull

The double-hull design concept is one of the effective ways for oil pollution prevention during collision and grounding accidents of oil tankers. Arguably there might be better design alternatives which improve the structural performance of ships against collision and grounding when compared to the thus far well accepted double-hull concept, or even a double hull that is better in comparison to what is being routinely achieved by today's design methods. In this paper, a recent state-of-the-art review is undertaken on the literature related to more rational tanker structural design procedures and some innovative design concepts for tanker structures against ship collisions and grounding.

scholarly journals Modelling and simulation for control of nutrient application in closed growing systems

1997 ◽  
Vol 45 (1) ◽  
pp. 127-142
Author(s):  
T.H. Gieling ◽  
J. Bontsema ◽  
T.W.B.M. Bouwmans ◽  
R.H. Steeghs
Keyword(s):  
Design Method ◽  
Model Description ◽  
Robust Performance ◽  
Robust Controller ◽  
Algorithm Performance ◽  
Design Procedures ◽  
Real Process ◽  
Standard Design ◽  
And Performance ◽  
Robust Design Method

The design of a controller for water supply and nutrient application in closed growing systems is presented and discussed with reference to nutrient film techniques in a 150 msuperscript 2 greenhouse. The 'robust design' method aims to distinguish between stability and performance and, in this case, the method deals with uncertainties in the model description of the real process, i.e. variability of flow and seasonal changes. Robust performance and robust stability, as qualities of the controlled process, were shown to be feasible for the control of nutrient application in closed growing systems. Algorithm performance was tested in a simulation procedure and shows very good disturbance suppression, staying well within the pre-set 10% limits. More standard design procedures could lead to a stable controlled process but would certainly be more conservative than the robust controller presented.

scholarly journals Design and Analysis of Rotor Assembly of Hammer Mill Machine`

2021 ◽  
Vol 11 (2) ◽  
pp. 28-37
Author(s):  
Akash Santosh Pawar
Keyword(s):  
Theoretical Calculations ◽  
Learning Experience ◽  
Design Procedure ◽  
Hammer Mill ◽  
Design Procedures ◽  
Standard Design ◽  
Standard Values ◽  
Mathcad Software ◽  
Rotor Assembly ◽  
The Given

The project deals with the Manufacturing with Design and Analysis of Hammer Mill Machine and Rotor Assembly of Machine of Capacity of 200 Kg/hr. Which is due to providing the transmission power of 5 HP to the machine. In this project, the Hammer mill machine body structure, Angle Frame and foundation frame for machine is designed using Catia. Also each and every part or component is required for machine is designed. In the present work by using standard design procedures, Diameter of the rotor of shaft of machine has been designed. Theoretical calculations done by using PTC Mathcad software for new learning experience and ease. When the shaft of the rotor is rotated at the given speed (rpm i.e. 1728 rpm) and the load applied to the shaft it should not bend during rotation. When the shaft is rotated under free conditions deflections will be created due to critical speed of the shaft. After Designing process, some of required drawings are converted into Ansys supported format i.e. drawings are imported into Ansys for further analysis. Meshing of the shaft model was done and the loads, stresses that were applied for the shaft to be checked out that the design should be safe one. The design should be safe when the values obtained from the design procedure were compared with the standard values and result obtained from the analysis using Ansys. As per the designing, the required parts are fabricated such as side plates, bearing support, doors, hinge supports by using conventional methods like gas cutting, welding, drilling, shaft turning, slotting, milling, etc. and some hardware materials buy from stores which is used for further assembly process. At the final step all parts are assembled according as per requirements. At the end actual capacity of machine is calculated by using conventional method.

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