Computational Tool for the Dynamic Analysis of Flexible Risers Incorporating Bending Hysteresis

2007 ◽  
Author(s):  
Russell Smith ◽  
Tommie Carr ◽  
Michael Lane
Keyword(s):  
Production Systems ◽  
New Technology ◽  
Fatigue Loading ◽  
Bending Stiffness ◽  
Analysis Tool ◽  
Flexible Pipe ◽  
Recent Developments ◽  
Dynamic Bending ◽  
Increasing Demand ◽  
Bending Response

Non-bonded flexible-pipe risers provide a structurally compliant solution in offshore floating production systems for the recovery of oil & gas. The bending stiffness of the flexible pipe is an important property in designing the riser system to safely withstand extreme and fatigue loading conditions. These risers have two fundamentally different bending stiffness properties that depend on if the riser system is pressurized or depressurized. A depressurized riser has a comparatively small linear bending stiffness. Most riser designs apply this stiffness as its produces conservative (large) bending responses. In recent years, the bending response predicted from the depressurized bending stiffness has proven overly conservative and there has been an increasing demand to consider the larger hysteretic bending stiffness of the pressurized riser. The objective is to reduce the conservatism and achieve an approved safe design. Recent developments have advanced the modeling of flexible riser bending with hysteresis and this capability has now been incorporated into an industry standard finite-element riser analysis tool. This paper describes the background of hysteresis in relation to non-bonded flexible pipes and outlines the methodology of the riser motions software that incorporates bending stiffness with hysteresis. Riser systems where the dynamic bending response is critical to the success of the design are the main applications that will benefit from this new technology. Examples include: i.) The dynamic bending response at the seabed touchdown of a deepwater catenary riser. ii.) Bending at an interface with the riser hang-off or subsea tie-in.

scholarly journals Recent Developments in Coatings, Gratings, and Reflective Components

1984 ◽  
Vol 79 ◽  
pp. 607-616
Author(s):  
R. R. Shannon
Keyword(s):  
State Of The Art ◽  
New Technology ◽  
The State ◽  
Current Technology ◽  
Large Size ◽  
Incoming Radiation ◽  
Recent Developments ◽  
Electronic Sensors ◽  
Large Primary ◽  
Telescope System

The requirements on gratings and coatings for astronomical use differ from the general industrial requirements primarily in the scale of the components to be fabricated. Telescopes have large primary mirrors which require large coating plants to handle the components. Dispersive elements are driven by the requirement to be efficient in the presence of large working apertures, and usually optimize to large size in order to efficiently use the incoming radiation. Beyond this, there is a “new” technology of direct electronic sensors that places specific limits upon the image scale that can be used at the output of a telescope system, whether direct imagery or spectrally divided imagery is to be examined. This paper will examine the state of the art in these areas and suggest some actions and decisions that will be required in order to apply current technology to the predicted range of large new telescopes.

Evaluation of a new technology when applied to sheep production systems: Part I—Model description

1989 ◽  
Vol 29 (1) ◽  
pp. 35-47 ◽  
Author(s):  
P.J. Bowman ◽  
D.A. Wysel ◽  
D.G. Fowler ◽  
D.H. White
Keyword(s):  
Production Systems ◽  
New Technology ◽  
Model Description ◽  
Sheep Production

scholarly journals Robust scheduling and dispatching rules for high-mix collaborative manufacturing systems

2021 ◽  
Author(s):  
Andrea Maria Zanchettin
Keyword(s):  
Manufacturing Systems ◽  
Production Systems ◽  
Adaptive Scheduling ◽  
Dispatching Rules ◽  
Numerical Verification ◽  
Robust Scheduling ◽  
Collaborative Manufacturing ◽  
Processing Times ◽  
Increasing Demand ◽  
Variable Production

AbstractMotivated by the increasing demand of mass customisation in production systems, this paper proposes a robust and adaptive scheduling and dispatching method for high-mix human-robot collaborative manufacturing facilities. Scheduling and dispatching rules are derived to optimally track the desired production within the mix, while handling uncertainty in job processing times. The sequencing policy is dynamically adjusted by online forecasting the throughput of the facility as a function of the scheduling and dispatching rules. Numerical verification experiments confirm the possibility to accurately track highly variable production requests, despite the uncertainty of the system.

An Analytical Model to Predict the Bending Behavior of Unbonded Flexible Pipes

2013 ◽  
Vol 57 (03) ◽  
pp. 171-177
Author(s):  
Leilei Dong ◽  
Yi Huang ◽  
Qi Zhang ◽  
Gang Liu
Keyword(s):  
Bending Moment ◽  
Bending Stiffness ◽  
Nonlinear Formulation ◽  
Flexible Pipe ◽  
Flexible Pipes ◽  
Bending Behavior ◽  
Interlayer Slip ◽  
Unbonded Flexible Pipes ◽  
Relationship Of ◽  
Theoretical Results

Analytical formulations are presented to determine the bending moment-curvature relationship of a helical layer in unbonded flexible pipes. Explicit expressions describing the variation of both bending stiffness and moment as a function of the applied curvature are given. The approach takes into account the nonlinearity of the response caused by the interlayer slip. The contribution of local bending and torsion of individual helical elements to the bending behavior of helical layers is included. Theoretical results for a typical unbonded flexible pipe using the nonlinear formulation for helical layers are compared with experimental data from the available literature. Encouraging correlations are found and the importance of the initial interlayer pressures is seen. The influence of local bending and torsion of individual helical elements on the bending behavior of the entire pipe is also evaluated. The results show that the inclusion of this local behavior significantly influences the full-slip bending stiffness.

Wearable Computing

2014 ◽  
pp. 96-120
Author(s):  
John Lindström ◽  
Claas Hanken
Keyword(s):  
New Technology ◽  
Wearable Computing ◽  
Legal Aspects ◽  
Careful Consideration ◽  
Security And Privacy ◽  
Bring Your Own Device ◽  
Work Processes ◽  
Intelligence Gathering ◽  
Recent Developments ◽  
Legal Frameworks

Wearable computing is gaining more and more interest as new “wearables,” intended for both work and leisure, are introduced. This trend brings benefits and challenges; for instance, the potential to improve work processes and issues related to IT management and privacy. The introduction and use of wearable computing provides opportunities to improve and reengineer work processes in organizations but can at the same time introduce alignment problems, as users in organizations may adopt the new technology before organizations are prepared. Further, alignment problems posed by the emerging trend, “Bring Your Own Device” (BYOD), are discussed. In addition, as in the cloud computing area, needed and necessary supportive legal frameworks have not yet fully addressed the new wearable computing technology. In the light of recent developments regarding global intelligence gathering, security and privacy concerns must be given careful consideration. Different alignment concepts for managing security challenges and legal aspects related to wearable computing, such as cultivation, care, hospitality, and care with hospitality, are discussed in the chapter.

Challenges and Issues in E-Banking Services and Operations in Developing Countries

2016 ◽  
pp. 237-281
Author(s):  
Preeti Rana ◽  
Durgesh Pandey
Keyword(s):  
Developing Countries ◽  
Banking Sector ◽  
New Technologies ◽  
New Technology ◽  
Banking Services ◽  
Banking And Finance ◽  
Banking Service ◽  
Wide Range ◽  
The World ◽  
Recent Developments

In recent years we have seen a number of changes in banking sector of India. Main objective of banks is to create more value for customers; that is why most of the banks have begun to take an innovative approach for this purpose. In the world of banking and finance, nothing stands still. Now a day's banking activities is not limited to deposit and lending money to customers Apart from traditional business, banks provide a wide range of services to satisfy the needs of all types of customers whether it is financial or non-financial needs from the smallest account holder to the largest company and in some cases of non-customers. As a result of recent developments, the entire banking industry has restructured and new technologies are also introduced to make it competitive. Revolution of Information Technology has made it possible to provide ease and flexibility in operations to customers thus making life simpler and easier so bank can provide a variety of products and services to the customers. The E-Banking process has changed the way of working of banks across the world. In the chapter, the author reviews the literature on “The issues and challenges of e-banking service operation” what is the perception of people towards E-Banking in different developing countries?” As E-Banking is an emerging concept in the field of commerce and banking. This paper furnishes the study of E-banking in developing countries through an analysis of content & existing literature that focused on developing countries. The main purpose of the study is to present the current level of research on E-banking in developing countries. Electronic banking (e-banking) is the new technology in banking environment that allows the bank customers to do banking activities at any time and from any place.

scholarly journals Role of Piezoelectric Elements in Finding the Mechanical Properties of Solid Industrial Materials

2018 ◽  
Vol 8 (10) ◽  
pp. 1737 ◽  
Author(s):  
Arshed Mohammed ◽  
Sallehuddin Haris ◽  
Mohd Nuawi
Keyword(s):  
Mechanical Properties ◽  
State Of The Art ◽  
New Technology ◽  
Material Testing ◽  
Current Status ◽  
Piezoelectric Elements ◽  
Need To Evaluate ◽  
Recent Developments ◽  
The Many

Recent developments in ultrasonic material testing have increased the need to evaluate the current status of the different applications of piezoelectric elements (PEs). This research have reviewed state-of-the-art emerging new technology and the role of PEs in tests for a number of mechanical properties, such as creep, fracture toughness, hardness, and impact toughness, among others. In this field, importance is given to the following variables, namely, (a) values of the natural frequency to PEs, (b) type and dimensions of specimens, and (c) purpose of the tests. All these variables are listed in three tables to illustrate the nature of their differences in these kinds of tests. Furthermore, recent achievements in this field are emphasized in addition to the many important studies that highlight the role of PEs.

Making IoT Run

2017 ◽  
Vol 1 (2) ◽  
pp. 26-44
Author(s):  
Peter Schott ◽  
Torben Schaft ◽  
Stefan Thomas ◽  
Freimut Bodendorf
Keyword(s):  
Production Systems ◽  
Smart Manufacturing ◽  
Structural System ◽  
Maturity Level ◽  
Smart Systems ◽  
Industrial Iot ◽  
Increasing Demand ◽  
Manufacturing Environments ◽  
Self Learning

This article describes how today's manufacturing environments are characterized by an increasing demand for individual products and constantly more product variants. Concomitant, developments in the fields of IT, robotics and artificial intelligence allow the realization of smart systems, which means networked, self-learning, self-regulating and versatile production systems to control this complexity. These developments are referred to as industrial IoT that is acknowledged as “next big thing” in production. Firms face the challenge of lacking guidelines for implementing IoT solutions. Neither the technological prerequisites nor generally applicable procedures for realizing an appropriate technological maturity level of the system-to-be exist. Addressing this deficit, a framework is introduced which systematically implements IoT within manufacturing. The framework presents a guideline for the establishment of structural system understanding, the determination of the target system's technological maturity level from a customer's perspective and, building on this, design implications for smart manufacturing.

Making IoT Run

2020 ◽  
pp. 377-397
Author(s):  
Peter Schott ◽  
Torben Schaft ◽  
Stefan Thomas ◽  
Freimut Bodendorf
Keyword(s):  
Artificial Intelligence ◽  
Production Systems ◽  
Smart Manufacturing ◽  
Maturity Level ◽  
Smart Systems ◽  
Industrial Iot ◽  
Increasing Demand ◽  
Manufacturing Environments ◽  
Self Learning

This article describes how today's manufacturing environments are characterized by an increasing demand for individual products and constantly more product variants. Concomitant, developments in the fields of IT, robotics and artificial intelligence allow the realization of smart systems, which means networked, self-learning, self-regulating and versatile production systems to control this complexity. These developments are referred to as industrial IoT that is acknowledged as “next big thing” in production. Firms face the challenge of lacking guidelines for implementing IoT solutions. Neither the technological prerequisites nor generally applicable procedures for realizing an appropriate technological maturity level of the system-to-be exist. Addressing this deficit, a framework is introduced which systematically implements IoT within manufacturing. The framework presents a guideline for the establishment of structural system understanding, the determination of the target system's technological maturity level from a customer's perspective and, building on this, design implications for smart manufacturing.

Buying blue helmets: The role of foreign aid in the construction of UN peacekeeping missions

2019 ◽  
Vol 57 (2) ◽  
pp. 312-328 ◽  
Author(s):  
Andrew Boutton ◽  
Vito D’Orazio
Keyword(s):  
Developing Countries ◽  
Foreign Aid ◽  
Post Cold War ◽  
Peacekeeping Operations ◽  
Un Peacekeeping ◽  
Recent Developments ◽  
Increasing Demand ◽  
Peacekeeping Missions ◽  
Do So

While the evolving nature and proliferation of UN peacekeeping operations in the post-Cold War period is well documented, we know less about how personnel are recruited for these missions. Furthermore, recent developments have rendered existing supply-side explanations for troop contributions less convincing. The increasing demand for personnel, along with stagnant UN reimbursement rates and the rising costs of participation that began during the 1990s, mean that it is less attractive than ever for developing countries to offer their own troops to what have become increasingly ambitious operations. Yet, we see a large pool of developing countries continuing to do so. To address this puzzle, we argue that UN member states with strong preferences for establishing peacekeeping missions have begun using foreign aid as an inducement to help potential contributors overcome the collective action problem inherent in multilateral peacekeeping operations. We uncover strong empirical evidence that these ‘pivotal states’ strategically allocate foreign aid to persuade contributing states to boost their contributions, and also to ensure that these missions continue to be staffed and maintained as costs rise, particularly during the post-1999 period. We also find that states are responsive to these financial inducements: foreign aid increases both the likelihood of contributing personnel and the size of a state’s contribution. Theoretically, this article advances the scholarly understanding of international organizations and cooperation by illuminating an informal, extra-organizational strategy by which IOs can facilitate cooperation.

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