Investigating the Transient Flooding and Sloshing in Internal Compartments of an ITTC Damaged Ro-Ro Passenger Ferry: Part I—Experimental Setup

2010 ◽  
Author(s):  
Chadi Khaddaj-Mallat ◽  
Jean-Luc Toularastel ◽  
Jean-Marc Rousset ◽  
Pierre Ferrant
Keyword(s):  
Experimental Setup ◽  
Ocean Engineering ◽  
Early Stages ◽  
Experimental Campaign ◽  
Physical Background ◽  
Set Up ◽  
Passenger Ferry

Passenger Ro-Ro ferries have proved to be extremely vulnerable regarding their hydrostatic stability when damaged. This is not only due to the design of their car decks. After an abrupt ingress of water caused by a maritime accident, the spaces below the car deck can experience intermediate flooding stages that might be more severe than the final condition, and the ship could actually sink in these early stages. The intermediate flooding stages depend upon hosts of factors pertaining to the vessel itself, the accident that caused the damage, as well as the environment. These factors are interdependent, and some of them interact during the flooding. An experimental campaign using the midsection of the PRR02 - ITTC/SiW passenger Ro-Ro ferry was devoted to provide a thorough insight to the flooding physics by quantifying these interactions using a novel-to-ocean-engineering methodology, the so-called DOE method, and try to find and then optimize a model for the transient flooding phase of Passenger Ro-Ro ferries. The present paper presents the physical background of the problem, as well as the innovative experimental set up that have been conceived to attain the objectives and hopefully lead to sound conclusions.

Investigating the Transient Flooding and Sloshing in Internal Compartments of an ITTC Damaged Ro-Ro Passenger Ferry: Part II—Experimental Analysis

2010 ◽  
Author(s):  
Chadi Khaddaj-Mallat ◽  
Fabienne Vadeboin ◽  
Laurent Davoust ◽  
Bruno Pettinotti ◽  
Bertrand Alessandrini ◽  
...  
Keyword(s):  
Experimental Methodology ◽  
Transient Phase ◽  
Complex Phenomenon ◽  
Ocean Engineering ◽  
Damage Area ◽  
Experimental Campaign ◽  
Physical Background ◽  
Set Up ◽  
Passenger Ferry ◽  
Ship Behavior

Passenger Ro-Ro ferries have proved to be extremely vulnerable regarding their hydrostatic stability when damaged. This is not only due to the design of their car decks. After an abrupt ingress of water caused by a maritime accident, the spaces below the car deck can experience dangerous intermediate flooding stages that might lead the ship to sink. The intermediate flooding stages depend upon hosts of factors that are interdependent. Some of them eventually interact during the flooding. An experimental campaign using the midsection of the PRR02 - ITTC/SiW passenger Ro-Ro ferry was devoted to provide a thorough insight to the flooding physics and to quantify these interactions using a novel-to-ocean-engineering methodology, the so-called DOE method. The physical background and the experimental set up of this campaign are presented in the previous one (OMAE2010-20047). This paper is devoted to presenting the experimental methodology and the first findings. The flooding is found a complex phenomenon in which a strong interaction between water and air occurs, also in coupling with the hydrodynamic efforts. Model tests based on one-factor-at-a-time experiments highlights the importance of the damage area and the time of damage creation in the ship behavior during the transient phase. We advocate the use of the DOE methodology to deal with stability problems and to find a model quantifying the intermediate flooding stages.

Innovation in Indian Business Groups

2018 ◽  
Author(s):  
Prashant Kale ◽  
Harbir Singh
Keyword(s):  
Risk Taking ◽  
Business Groups ◽  
Formal Learning ◽  
Internal Markets ◽  
Early Stages ◽  
Innovation Culture ◽  
External Sources ◽  
Set Up ◽  
Organizational Mechanisms ◽  
Learning Interventions

Innovation is a critical to the success of large, diversified Indian business groups and this chapter explores the specific organizational mechanisms they have adopted to enable and foster innovation in their organizations. First, these groups provide internal markets for much needed capital and talent necessary for innovation to make up for sufficient lack of these institutions externally. In addition, they have pursued the following actions: (a) significantly upped their investments in R&D and innovation, (b) created internal leadership councils to oversee and promote innovation, (c) created an innovation culture that encourages and celebrates entrepreneurship, risk-taking, and tolerance for failure, (d) undertaken formal learning interventions to build the innovation capabilities of their managers, and (e) set-up formal units to in-source innovation from external sources. Indian companies are yet in the early stages of this journey and will have to sustain these practices to demonstrate durable success with innovation.

Numerical and Experimental Analysis of the Nonlinear Dynamics due to Impacts of a Continuous Overhung Rotor

1997 ◽  
Author(s):  
Mohammed F. Abdul Azeez ◽  
Alexander F. Vakakis
Keyword(s):  
Nonlinear Dynamics ◽  
Partial Differential Equations ◽  
Differential Equations ◽  
Numerical Experiments ◽  
The Other ◽  
Experimental Setup ◽  
Partial Differential ◽  
Qualitative Comparison ◽  
Set Up ◽  
Theory And Experiments

Abstract This work is aimed at obtaining the transient response of an overhung rotor when there are impacts occurring in the system. An overhung rotor clamped on one end, with a flywheel on the other and impacts occurring in between, due to a bearing with clearance, is considered. The system is modeled as a continuous rotor system and the governing partial differential equations are set up and solved. The method of assumed modes is used to discretize the system in order to solve the partial differential equations. Using this method numerical experiments are run and a few of the results are presented. The different numerical issues involved are also discussed. An experimental setup was built to run experiments and validate the results. Preliminary experimental observations are presented to show qualitative comparison of theory and experiments.

scholarly journals The Laboratory Definition of the Thermal Resistance of Growing Media for Green Roofs: New Experimental Setups

Buildings ◽  
2018 ◽  
Vol 8 (10) ◽  
pp. 139 ◽  
Author(s):  
Benedetta Barozzi ◽  
Alice Bellazzi ◽  
Claudio Maffè ◽  
Italo Meroni
Keyword(s):  
Thermal Resistance ◽  
Working Conditions ◽  
Laboratory Tests ◽  
National Research Council ◽  
Green Roofs ◽  
Growing Media ◽  
Experimental Campaign ◽  
Methodological Approaches ◽  
Set Up ◽  
Definition Of

Green roofs are one of the most extensively investigated roofing technologies. Most of the bibliographical studies show results of researches focused on the analysis of different configurations of green roofs, but only few researches deal with the calculation of the growing media thermal resistance using laboratory tests. From 2009 to 2013, ITC-CNR, the Construction Technologies Institute of the National Research Council of Italy, carried out a first laboratory experimental campaign focused on the definition of thermal performances curves of growing media for green roofs as a function of both density and percentage of internal moisture. During this campaign, the experimental results underlined some existing gaps, such as the absence of specific standards concerning the sample laboratory preparation, the absence of shared references concerning the compaction level reached by samples in real working conditions and the evaluation of the internal moisture content of growing media exposed to atmospheric agents. For this reason, the ITC-CNR has set up a second experimental campaign focused on the solution of the gaps underlined by the first phase concerning the preparation of samples for the laboratory calculation of the thermal resistance of growing media for green roofs. This paper proposes and presents methodological approaches, methods and new test devices implemented to solve these gaps, and the results obtained.

scholarly journals FIRE DYNAMICS IN FAÇADE FIRE TESTS, Measurement, modeling and repeatability

2016 ◽  
Author(s):  
Johan Anderson ◽  
Lars Boström ◽  
Robert Jansson ◽  
Bojan Milovanović
Keyword(s):  
Test Specimen ◽  
Heat Exposure ◽  
Full Scale ◽  
Experimental Setup ◽  
Fire Tests ◽  
Fire Dynamics ◽  
Test Set ◽  
Set Up

Presented is a comparison between full-scale façade tests where SP Fire 105 and BS 8414-1 were used regarding repeatability and the use of modelling to discern changes in the set-ups. Results show that the air movements around the test set-up (the wind) may have a significant impact on the tests and that the heat exposure to the façade surface will among other depend on the thickness of the test specimen. Also demonstrated was that good results could be obtained by modelling of the façade fire tests giving us the opportunity to use these methods to determine the effect of a change in the experimental setup.

scholarly journals Understanding formability and geometrical accuracy of SPIF process used as Reshaping approach

2021 ◽  
Author(s):  
Omer Zaheer ◽  
Giuseppe Ingarao ◽  
Rosa Di Lorenzo ◽  
Livan Fratini
Keyword(s):  
End Of Life ◽  
Sheet Metal ◽  
Single Point ◽  
Geometrical Accuracy ◽  
Experimental Campaign ◽  
New Process ◽  
Relevant Role ◽  
Set Up ◽  
Accuracy Performance ◽  
Urgent Action

Putting in place Circular Economy strategies is an urgent action to be undertaken. Manufacturing processes play a relevant role as efficient material reuse enabler. Scientists have to make an effort either to find new process or to rethink old process to reprocess End-of-life (EoL) components to recover both material and functions. In this paper, Single Point Incremental Forming (SPIF) process is used for reshaping sheet metal EoL components. Deep drawing process as well as uniaxial pre-straining (to imitate the End-of-Life component) followed by SPIF operations (to obtain the reshaped components) are set- up and implemented to form and reform aluminum sheet metal components. As the authors have already proved the technical feasibility of such an approach, the present paper aims at a better understanding of the formability and geometrical accuracy performance of SPIF process as used to reform components. Specifically, an experimental campaign varying kind and extent of restraining is developed and the formability and geometrical accuracy of the subsequent SIPF operations is analyzed. Results proves that SPIF process is a promising approach for reshaping purpose.

Acoustic determination of early stages of intravascular blood coagulation

2008 ◽  
Vol 366 (1880) ◽  
pp. 3649-3661 ◽  
Author(s):  
Svetlana G Uzlova ◽  
Konstantin G Guria ◽  
Georgy Th Guria
Keyword(s):  
Blood Coagulation ◽  
Early Stage ◽  
Simultaneous Detection ◽  
Coagulation System ◽  
Complex Biological System ◽  
Ultrasonic Methods ◽  
Non Invasive ◽  
Early Stages ◽  
Major Disadvantage ◽  
Set Up

The blood coagulation system (BCS) is a complex biological system playing a principal role in the maintenance of haemostasis. Insufficient activity of the BCS may lead to bleeding and blood loss (e.g. in the case of haemophilia). On the other hand, excessive activity may cause intravascular blood coagulation, thromboses and embolization. Most of the methods currently used for BCS monitoring suffer from the major disadvantage of being invasive. The purpose of the present work is to demonstrate the feasibility of using ultrasonic methods for non-invasive registration of the early stages of blood coagulation processes in intensive flows. With this purpose, a special experimental set-up was designed, facilitating the simultaneous detection of optical and acoustic signals during the clotting process. It was shown that (i) as microemboli appear in the flow during the early stage of blood coagulation, the intensity of the Doppler signal increases twofold, and (ii) microemboli formation in the early stages of blood clotting always reveals itself through an acoustic contrast. Both of these effects are well defined, so we hope that they may be used for non-invasive BCS monitoring in clinical practice.

Prosodic accommodation in language contact: Spanish intonation in Majorca

2013 ◽  
Vol 2013 (221) ◽  
Author(s):  
Magdalena Romera ◽  
Gorka Elordieta
Keyword(s):  
Language Contact ◽  
Native Speaker ◽  
Spanish Speakers ◽  
Prosodic Features ◽  
Native Spanish Speakers ◽  
Early Stages ◽  
Contact Situation ◽  
Set Up ◽  
Selection Of

AbstractIn this article we study a language contact situation in Majorca, Spain, in which adult monolingual speakers of Spanish who arrived recently in Majorca acquire aspects of Majorcan Catalan prosody. Although the possibility that the adoption of features can take place directly from Catalan is not rejected, we provide evidence that it can be an indirect process, through a process of accommodation (Trudgill 1986; Giles and Coupland 1991) to the L2 variety of Spanish spoken by L1 Majorcan Catalan speakers. An experiment was set up in which we recorded four native Spanish speakers who arrived recently in Majorca holding a semi-directed conversation in Spanish with a native speaker of Majorcan Catalan. The results showed consistent adoption of prosodic features of L2 Majorcan Spanish in interrogative sentences (not in declaratives). The results support the idea that the adoption of prosodic features of Majorcan Catalan by monolingual Spanish speakers can take place in early stages of contact. Our article also shows that subjective factors such as determination towards integration play a fundamental role in determining the degree of accommodation. Finally, salience of prosodic features is claimed to play a role in the selection of transferred features.

A New Experimental Setup and Method to Analyze Cutting Forces in Non-Stationary Conditions

2011 ◽  
Vol 223 ◽  
pp. 679-688
Author(s):  
Sajid Yaqub ◽  
Arnaud Larue ◽  
Gerard Coffignal
Keyword(s):  
Cutting Forces ◽  
Cutting Tool ◽  
Orthogonal Cutting ◽  
Cutting Conditions ◽  
Depth Of Cut ◽  
Experimental Setup ◽  
Process Damping ◽  
Flexible Workpiece ◽  
Vibration Drilling ◽  
Set Up

The numerical simulation of machining, when dealing with flexible workpieces, still needs to be improved by the introduction of more accurate cutting force models. The aim of this paper is to propose a general method which is designed to generate transient cutting forces and severe cutting conditions including process damping to be able to set up cutting laws in these cases. In this first approach, the method is limited to orthogonal cutting. The method is based on a special design of a very simple "flexible workpiece" where slots have been introduced in the machined area to get an intermittent cutting. The exibility of the workpiece induces axial vibrations like it is done in vibration drilling and the presence of slots leads to cutting conditions similar to those of milling. The proposed testing device has been designed to be flexible along one degree of freedom, while the cutting tool is considered as rigid. This allows to generate cutting conditions where the axial depth of cut fluctuates as well as the contact between the cutting tool and the workpiece. The experimental setup allows the measurement of cutting forces and the simultaneous measurement of the relative tool/workpiece displacements. The measured signals and numerical interpretations of the machining operation allow to compare a proposed cutting law with the experimental results. The cutting law parameters can then be optimized, even when process damping occurs. The paper introduces a first application of the proposed method.

Diagnosis of Artificial Gear Defects on Single Stage Gearbox Using Acoustic Emission

2006 ◽  
Vol 13-14 ◽  
pp. 415-420 ◽  
Author(s):  
Theodoros Loutas ◽  
J. Kalaitzoglou ◽  
G. Sotiriades ◽  
E. Kayias ◽  
V. Kostopoulus
Keyword(s):  
Acoustic Emission ◽  
Health Monitoring ◽  
Damage Evolution ◽  
Single Stage ◽  
Experimental Setup ◽  
Early Stages ◽  
Mechanical Components

Acoustic Emission is a very powerful tool for health monitoring of structures and mechanical components, especially due to its sensitivity, which is very useful at the early stages of damage evolution. Evaluation of its potential on rotating structures such as gearboxes, is studied in the present paper. A new concept of transducer mounting is realized in a single stage in-house built gearbox. The acoustic emission signature of the healthy gears is acquired. Then artificial defects are seeded and the acquisition is repeated. The signals are afterwards analyzed and the assessment of the applicability of the method becomes possible. Given the present experimental setup, health monitoring of gearboxes using acoustic emission is considered to be of rising potential.

Sign in / Sign up

Export Citation Format

Share Document