Understanding Hybrid Subsea Foundation Design

2015 ◽  
Author(s):  
M. Kabir Hossain ◽  
Han Shi ◽  
Basel Abdalla ◽  
Markella K. Spari
Keyword(s):  
Best Practice ◽  
Real Option ◽  
Integrated System ◽  
Foundation Design ◽  
Deep Foundation ◽  
Modeling And Analysis ◽  
Fea Model ◽  
Design Variables ◽  
Hard Limit ◽  
Soil Sensitivity

Hybrid subsea foundations (HSF) are combined foundation systems of mudmats and piles. The primary motivation of combining these two foundation types is to provide greater resistance to large horizontal loads in addition to vertical loads, for which use of mudmats alone will require it to be of impractically large size. The contribution from the piles in the lateral capacity helps to limit the size of the mudmat, which is critical in subsea environment. In a brownfield situation, this is sometimes a hard limit with only limited space available to place a new mudmat in the existing field layout. Also, in some cases, the HSF may prove to be a more economical option for resisting large horizontal loads compared to, for example, to suction piles. While the authors are aware of some scattered project-specific design and use of subsea mudmat-pile hybrid foundations by individual contractors and operators, there is no industry-wide publicly known best practice currently available. These designs of HSF appear to be generally based on simplified analytical approach that require superimposition of conventional shallow and deep foundation capacity calculation methods, hence violates the static and kinematic compatibility requirements fundamental for a sound and robust prediction procedure. This paper attempts to provide some insight into the behavior of mudmat-pile foundations as a hybrid integrated system numerically using finite element modeling and analysis (FEA). The interactions between the mudmat and the piles in an HSF are complex and hence a FEA-based approach is considered most suitable. The FEA model in this study included the mudmat, the corner piles, the pile-mudmat connections and the seabed soil. Sensitivity of the HSF capacity to the size of the piles (length and diameter), the connection type of the piles to the mudmat, and the number of piles are selectively investigated and the results presented. Based on these results some pertinent observations relevant to design of HSFs are also given. While the study is of limited scope, it offers important insights into the effects of the primary design variables on HSF’s capacities. Therefore, the authors hope the information herein will be of benefit to practicing subsea engineers who might have to face choices to consider mudmat-pile hybrid foundations as a real option for their projects.

A priori assessment of a smart-navigated unmanned aerial vehicle disaster cargo fleet

SIMULATION ◽  
2020 ◽  
Vol 96 (8) ◽  
pp. 641-653
Author(s):  
Jonathan Larson ◽  
Paul Isihara ◽  
Gabriel Flores ◽  
Edwin Townsend ◽  
Danilo R. Diedrichs ◽  
...  
Keyword(s):  
Disaster Response ◽  
Best Practice ◽  
A Priori ◽  
Geographic Distance ◽  
Field Tests ◽  
General Purpose ◽  
Assessment Model ◽  
Sensitivity Analyses ◽  
Modeling And Analysis ◽  
Cargo Delivery

The United Nations Office for the Coordination of Humanitarian Affairs has asserted that risks in deployment of unmanned aerial vehicles (UAVs) within disaster response must be reduced by careful development of best-practice standards before implementing such systems. With recent humanitarian field tests of cargo UAVs as indication that implementation may soon become reality, a priori assessment of a smart-navigated (autonomous) UAV disaster cargo fleet via simulation modeling and analysis is vital to the best-practice development process. Logistical problems with ground transport of relief supplies in Puerto Rico after Hurricane Maria (2017) pose a compelling use scenario for UAV disaster cargo delivery. In this context, we introduce a General Purpose Assessment Model (GPAM) that can estimate the potential effectiveness of a cargo UAV fleet for any given response region. We evaluate this model using the following standards: (i) realistic specifications; (ii) stable output for various realistic specifications; and (iii) support of humanitarian goals. To this end, we discuss data from humanitarian cargo delivery field tests and feedback from practitioners, perform sensitivity analyses, and demonstrate the advantage of using humanitarian rather than geographic distance in making fleet delivery assignments. We conclude with several major challenges faced by those who wish to implement smart-navigated UAV cargo fleets in disaster response, and the need for further GPAM development. This paper proposes the GPAM as a useful simulation tool to encourage and guide steps toward humanitarian use of UAVs for cargo delivery. The model’s flexibility can allow organizations to quickly and effectively determine how best to respond to disasters.

Mathematical Modeling and Analysis of Riser Gas Unloading Problem

2018 ◽  
Author(s):  
Raj Kiran ◽  
Saeed Salehi
Keyword(s):  
Oil And Gas ◽  
Numerical Models ◽  
Drilling Fluid ◽  
Extensive Study ◽  
Integrated System ◽  
Modeling And Analysis ◽  
Oil And Gas Exploration ◽  
Water Based ◽  
Point Pressure ◽  
Comparative Results

Pushing the boundaries of oil and gas exploration and development to new frontiers have led to exposure and more significant uncertainties, which necessitates robust strategies and techniques. With the increasing water depth, longer risers, and harsh pressure and temperature conditions; the risk of riser gas getting undetected get bigger. The lack of an integrated system to anticipate the controlling parameters at the choke below the BOP constrains the tackling operations and exacerbate the side effects of oil and gas well blowouts. This leads to an urgent need for an extensive study to address the riser gas unloading (RGU) events. This study encompasses the development of a robust model that can characterize the effect of different parameters such as temperature, mud types, back pressure, and solubility in RGU events. It also presents comparative results of oil-based and water-based mud systems, using a novel tool based on analytical and numerical models. The analytical model is constructed using combined gas law, heat transfer mechanism, and gas solubility and bubble point pressure concepts. Results suggest that the oil-based mud (OBM) takes more time for gas unloading in comparison to the water-based mud. Also, a significant deviation was observed in unloading patterns while considering temperature effect. For the drilling fluid without temperature consideration, the gas unloading occur in a smaller span of time and at a higher depth. Overall, this paper will demonstrate the effect of different parameters affecting the gas unloading in the riser, and present a comparative study of different parameters using an analytical which can be used in the field to get an idea of gas prior to any response for abnormality.

Dynamic Modeling and Analysis of Active Magnetic Bearings

2014 ◽  
Vol 494-495 ◽  
pp. 685-688
Author(s):  
Rong Gao ◽  
Gang Luo ◽  
Cong Xun Yan
Keyword(s):  
Dynamic Characteristic ◽  
Dynamic Modeling ◽  
Magnetic Bearing ◽  
Integrated System ◽  
Magnetic Bearings ◽  
Active Magnetic Bearing ◽  
Active Magnetic Bearings ◽  
Modeling And Analysis ◽  
Amb System ◽  
Mathematics Method

Active magnetic bearing (AMB) system is a complex integrated system including mechanics, electronic and magnetism. In order to research for the basic dynamic characteristic of rotor supported by AMB, it is necessary to present mathematics method. The dynamics formula of AMB is established using theory means of dynamics of rotator and mechanics of vibrations. At the same tine, the running stability of rotor is analyzed and the example is presented in detail.

Analytical Method to Estimate Railroad Spike Fastener Stress

2020 ◽  
Vol 2674 (11) ◽  
pp. 379-389 ◽  
Author(s):  
Marcus S. Dersch ◽  
Matheus Trizotto Silva ◽  
J. Riley Edwards ◽  
Arthur de O Lima ◽  
Tom Roadcap
Keyword(s):  
Analytical Method ◽  
Model Development ◽  
Element Model ◽  
Foundation Design ◽  
Deep Foundation ◽  
Cross Sectional ◽  
Field Instrumentation ◽  
Key Variables ◽  
Railroad Safety ◽  
Laterally Loaded

Previous research indicates that spike fastener fatigue failures have led to at least ten derailments since 2000. Given that railroads continue to install fastening systems that have experienced spike failures, methods to quantify the stress state of the spike must be developed. Common approaches to quantify the effect of key variables include laboratory experimentation, field instrumentation, or finite element model development. However, these approaches may be both time and cost prohibitive. An analytical method based on beam on elastic foundation mechanics, similar to the analysis of laterally loaded piles in deep foundation design, was developed to estimate the spike stresses. The outcome is a laboratory-validated analytical approach that generates estimates of spike stress. This analytical model was used to investigate key design criteria (timber modulus, spike cross-sectional area, and load applied) that could be changed to improve the resiliency of the fastening system to increase railroad safety. Another outcome of this study is the development of an instrumented spike that quantifies the spike demands when installed and loaded within a crosstie.

A New Method for Simultaneous Optimization of a Structure With Active and Passive Control Variables

2015 ◽  
Author(s):  
Ui-Jin Jung ◽  
Gyung-Jin Park
Keyword(s):  
Control Systems ◽  
Large Scale ◽  
Optimization Problem ◽  
Integrated System ◽  
Static Loads ◽  
Design Variables ◽  
Response Optimization ◽  
The Time Domain ◽  
Control Forces ◽  
And Control

An optimization method is proposed for the simultaneous design of structural and control systems using the equivalent static loads. The two structural and control systems are not completely independent and need to be considered in a unified fashion. Furthermore, an integrated system design is unavoidable to exhibit a good performance in the time domain. The analysis for the integrated system is conducted for the transient-state in a dynamic manner. The constraints for the structural and control systems are defined in the time domain as well. Therefore, a physically small scale problem in structural analysis easily becomes quite a large scale in an optimization problem. A new equivalent static loads (ESLs) method, which deals with the structural design variables as well as the control design variables, is proposed to solve physically large scale problems. A finite element dynamic equation is defined with control forces and a dynamic response optimization problem is formulated. Linear static response optimization is carried out with the ESLs. The control forces for the linear static response optimization are considered as design variables. Shape variables are utilized to handle the design variables for the control forces. Several examples are solved to validate the proposed method.

scholarly journals Pengembangan Infrastruktur Pelabuhan Panjang Sebagai Pelabuhan Cargo Bertaraf Internasional

2016 ◽  
Vol 12 (1) ◽  
pp. 1
Author(s):  
Adi Rachmadi
Keyword(s):  
Data Collection ◽  
South Korea ◽  
Best Practice ◽  
Test Site ◽  
Integrated System ◽  
Office Building ◽  
Service Users ◽  
Infrastructure Development ◽  
Minimum Requirements ◽  
The Government

Infrastructure development in Indonesia continued to show progress, including the development of the port as a place which is an integrated system consisting of transport in the waters, port, safety and security, and environmental protection in maritime. Lampung province that has the port will control that is essential for the regions surrounding potential in improving the economy, especially industry and trade both nationally and internationally. The purpose of this study was to assess the Port of Panjang infrastructure development as an international cargo port. Therefore, researchers using the theory to fill positivistic approach and examples of best practice to fill rationalistic. Best practice is used is the Port of TanjungPriok, Jakarta, and Port of Busan, South Korea as a cornerstone of researchers to conduct research. The research character is a descriptive. Methods of data collection is done by direct observation to the test site and interview techniques combined with a list of questions to the government and service users. The results showed Port of Panjang Infrastructure meet the minimum requirements of international cargo ports established by the IMO, the Port of Panjang must add infrastructure and supporting facilities. Water facilities, ports should be developed, among others, relocation is docked tug boat, pilot boat and service boat, while the infrastructure to be developed is the yard, office building (banking) and postal telecommunications, reactivation of the railway to transport coal, and gangway to lane expressway passenger sea. 

scholarly journals Just-in-Time system in terms of real options

Competitio ◽  
2020 ◽  
Vol 3 (1) ◽  
Author(s):  
Andrea Rozsa
Keyword(s):  
Resource Allocation ◽  
Real Options ◽  
Best Practice ◽  
Real Option ◽  
Corporate Strategy ◽  
Capital Budgeting ◽  
Just In Time ◽  
The Real ◽  
Practice Approach ◽  
Physical Assets

The value creation process in a company and the competitive position are critically influenced by corporate resource allocation and proper valuation of investment alternatives. After the Second World War, capital budgeting and strategic planning emerged as two complementary but different systems for resource allocation. The real options approach developed in the ’80s may provide a useful tool for making a connection between capital budgeting and strategic management. Real options are implicit managerial and operating flexibilities embedded in many non-financial assets and liabilities. In a wider sense: “A real option is the investment in physical assets, human competence, and organisational capabilities that provide the opportunity to respond to future contingent events” (Kogut-Kulatilaka, 2001). This paper shows that Just-in-Time (JIT) system as management philosophy can be regarded as a knowledge-based or capability-based implicit strategy rather than a simple, easy-toimitate best practice approach. Moreover, implementation of JIT can be considered as a strategic investment. The presentation focuses on how the relation among strategic investments, developed technological systems and corporate strategy can be expressed through the real options view.

Volume 14 Issue 1 Editorial Note

2020 ◽  
Vol 14 (1) ◽  
Author(s):  
Anne Lemnitzer
Keyword(s):  
Ground Improvement ◽  
Soft Clay ◽  
Lateral Spreading ◽  
Editorial Note ◽  
Foundation Engineering ◽  
Load Testing ◽  
Highly Qualified ◽  
Foundation Design ◽  
Deep Foundation

The first of two issues in 2020 is a mix of research and case study papers. 2020 is an exciting year for the DFI Journal as we expanded our editorial board with a set of highly qualified editors with various expertise in deep foundation engineering, ground improvement, slope stabilization, QA/QC of pile elements, load testing, seismic foundation design, and innovative foundation construction technologies. The first paper is a 2019 Student Paper Competition Award winner; the second covers factors of safety for drilled shaft foundations; the third presents results of models of pile-supported wharves subjected to inertial and liquefaction-induced lateral spreading loads; the fourth presents analysis of static loading tests on CFA piles in clay and sand; and the closing paper is an analysis of soft clay parameters on an existing quay wall in Egypt.

An Assessment of Customer’s Preferences and Improve Brand Awareness Implementation of Social CRM in an Automotive Company

2013 ◽  
Vol 4 (1) ◽  
pp. 1-15 ◽  
Author(s):  
Agostino Marengo ◽  
Alessandro Pagano ◽  
Alessio Barbone
Keyword(s):  
Business Intelligence ◽  
Best Practice ◽  
Integrated System ◽  
Huge Amount ◽  
Automotive Market ◽  
Social Crm ◽  
Crm System ◽  
Automotive Company ◽  
Definition Of ◽  
The Relationship

The huge amount of online conversations that arises from the new means of communication between users, if analyzed and capitalized, is an important resource for companies and brands alike. Thus, a fundamental tool for the management of the relationship with customers such as CRM seems to be exceeded. The concept of a Social CRM platform was born with the objective of filling the gap between brand and customers connected to various social networks, allowing both parties to achieve tangible benefits from active participation. The key objective of this research involves the implementation of a Social CRM system, which is not yet present on the automotive market. The work starts through the identification and implementation of an experimental prototype that can define and highlight a methodological and technological best practice in the integration of heterogeneous components of an information system composed of independent software and continues with the definition of an integrated system that allows innovative Business Intelligence activities.

Sign in / Sign up

Export Citation Format

Share Document