Relevant bibliographies by topics / Lenghwise position centre of gravity

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  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers

Academic literature on the topic 'Lenghwise position centre of gravity'

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Published: 4 June 2021
Last updated: 13 February 2022

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Journal articles on the topic "Lenghwise position centre of gravity"

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Dancila, B. D., R. Botez, and D. Labour. "Fuel burn prediction algorithm for cruise, constant speed and level flight segments." Aeronautical Journal 117, no. 1191 (May 2013): 491–504. http://dx.doi.org/10.1017/s0001924000008149.

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Abstract This paper presents a new algorithm that predicts the quantity of fuel burned by an aircraft flying at a constant speed and altitude. It considers the continuous fuel burn rate variation with time caused by the gross weight (and centre of gravity position) modification due to the fuel burn process itself. The algorithm was developed for use by the Flight Management System (FMS) and employs the same aircraft performance data as the existing FMS fuel burn prediction algorithms. The new fuel burn method was developed for aircraft models that use the centre of gravity position as well as for models that do not consider the centre of gravity position. This algorithm was developed for normal flight conditions. Algorithm performances were evaluated for two aircraft models: one for models that use an aircraft’s centre of gravity position – a more complex and computing intensive method, and one for those that do not use the centre of gravity position. The validation data were generated based on the information produced on a CMC Electronics – Esterline FMS platform that used identical aircraft models and performance data for identical flight conditions.
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Monnet, T., C. Valle, and P. Lacouture. "Simultaneous identification of the joint centre location, the mass and the centre of gravity position." Computer Methods in Biomechanics and Biomedical Engineering 12, sup1 (August 2009): 193–94. http://dx.doi.org/10.1080/10255840903091544.

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Zhao, Xin Tong, H. Z. Jiang, S. T. Zheng, and Jun Wei Han. "Precision Gravity Center Position Measurement System for Heavy Vehicles." Key Engineering Materials 315-316 (July 2006): 788–91. http://dx.doi.org/10.4028/www.scientific.net/kem.315-316.788.

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Knowledge of a vehicle’s inertial parameters is essential for safety research and accident reconstruction. A precision measure system is proposed to determine the weight and gravity center for heavy vehicles. Based on a static gravity measuring principle with three measuring points, a hydraulically driven 2-DOF motion platform is developed. The transfer function model is derived for the hydraulically driven system. By means of a degree-of-freedom control scheme, the platform can realize accurate positioning to construct two intersected planes and work out the three-dimensional coordinates of the vehicle gravity center. Experiments demonstrate that the system has less than 0.3% measurement error in weight, and is able to measure the gravity centre accurately with deviation ≤3mm in X and Y direction, and ≤5mm in Z direction.
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Solmaz, Selim, Mehmet Akar, Robert Shorten, and Jens Kalkkuhl. "Real-time multiple-model estimation of centre of gravity position in automotive vehicles." Vehicle System Dynamics 46, no. 9 (September 2008): 763–88. http://dx.doi.org/10.1080/00423110701602670.

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Forslund, R. R. "The power function as a simple stem profile examination tool." Canadian Journal of Forest Research 21, no. 2 (February 1, 1991): 193–98. http://dx.doi.org/10.1139/x91-023.

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Formulae are presented for calculating the volume, surface area, centre of gravity, centre of mass, form, taper, and instantaneous slope of the power function. A profile plotting technique is also used that allows visual comparisons between average stem profiles independent of the size and taper of individual stems. The technique is used to demonstrate that the position near 30% of the height from the base of the stem is a position of form stability for volume estimation. Using the paracone profile model (a power function midway between a paraboloid and a cone) with the diameter at the 30% position and the total stem height, individual stem volume estimates within 10% of the true volume (95% confidence) are obtained once again using a sample of 50 yearling aspen (Populustremuloides Michx.). The plotting technique is then applied to the aspen sample, and the average profiles support the hypothesis that juvenile stems may begin life as paraboloids. The average centre of gravity, the average centre of mass, the sectional form, the average form, and the taper of the stems are also examined and are shown to be quantitative indicators of the plotted profile characteristics.
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Robinson, T. O., I. Eames, and R. Simons. "Dense gravity currents moving beneath progressive free-surface water waves." Journal of Fluid Mechanics 725 (May 23, 2013): 588–610. http://dx.doi.org/10.1017/jfm.2013.112.

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AbstractThe characteristics of dense gravity currents in coastal regions, where free-surface gravity waves are dominant, have yet to be studied in the laboratory. This paper provides a first insight into the dynamics of dense saline gravity currents moving beneath regular progressive free-surface water waves. The gravity currents were generated by releasing a finite volume of saline into a large wave tank with an established periodic wave field. After the initial collapse, the gravity currents propagated horizontally with two fronts, one propagating in the wave direction and the other against the wave direction. The fronts of the gravity currents oscillated with an amplitude and phase that correlated with the orbital velocities within a region close to the bed. To leading order, the overall length of the gravity current was found to be weakly affected by the wave action and the dynamics of the current could be approximated by simply considering the buoyancy of the released fluid. Other characteristics such as the position of the gravity current centre and the shape of the two leading profiles were found to be significantly affected by the wave action. The centre was displaced at constant speed dependent on the second-order wave-induced mean Lagrangian velocity. For long waves, the centre was advected downstream in the direction of wave propagation owing to the dominance of Stokes drift. For short waves, the gravity current centre moved upstream against the wave direction, as under these wave conditions Stokes drift is negligible at the bed. An asymmetry in the shape of the upstream and downstream current heads was observed, with the gravity current front moving against the waves being much thicker and the front steeper, similar to the case of a current moving in a stream.
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Hasanov, F. G. "Technology of steel jackets load-out in deep-water offshore platforms from the barge." Azerbaijan Oil Industry, no. 2 (February 15, 2020): 25–29. http://dx.doi.org/10.37474/0365-8554/2020-2-25-29.

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Currently, great attention is paid to the development issue of the shelf’s fuel and energy resources foremost in the oil-gas fields of the Caspian Sea. The problem solution requires the studying of great majority of scientific-technical issues. One of the significant problems is the lead-out of steel jacket from the offshore platform as a major element of oil-gas field hydro-technical facilities meant for the operation in the deep water. The calculations for the execution of operations with steel jacket of deep stationary platform from the block with the detailed chara- cteristics by the mass and gravity center coordinates alongside line data have been carried out with “SACS” and “STAAD.PRO” software programs. The steel jacket is pushed astern with the push-pull equipment on the barge. Due to the shift of gravity centre the jacket changes the trim in the stern. Through the elevation of trim angle brought in alignment with the friction ration between the jacket and barge, the jacket slides further itself. Herewith, the trim increases until the gravity centre of steel jacket on the barge is not in alignment with rotation centre of the large rocker arms. The studies helped to fix the position of the jacket’s gravity centre from the aft perpendicular, the trim moment, the trim of the barge, the draft with the bow and stern and the trim angle as well.
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Matkowski, Adam, Radosław Karwowski, and Beata Zagórska-Marek. "Two algorithms of determining the middle point of the shoot apex by surrounding organ primordia positions and their usage for computer measurements of divergence angles." Acta Societatis Botanicorum Poloniae 67, no. 2 (2014): 151–59. http://dx.doi.org/10.5586/asbp.1998.017.

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The measurements of the divergence angle between organ primordia in magnolia floral apices and vegetative apices (embryonic shoots) of coniferous trees were performed, using computer application Phyl for IRIX. It appears that the values of the angle are strongly affected by the position of the apex centre, which was calculated by the program on a base of input positions of surrounding primordia. Two algorithms were used to determine the centre position: in program version Phyl 1 it was calculated as the gravity centre whereas in Phyl 2 version as a geometrical midpoint. The both methods differ in resulting centre position. This is dependent on such apex features as: proportions between its size and the size of primordia (expression of phyllotaxis), the angular distances between succesive primordia (quality of phyllotaxis), radial distances between primordia of different age (profile of the apical dome), the number of recorded primordia. The accuracy and reliability of both algorithms for determination of the centre position and, consequently, the reliability of divergence measurements were verified by applying them to ideal, computer simulated spiral phyllotactic systems with divergence given arbitrarily by the user. The conclusions from the results of simulations are that there is a possibility of selecting more suitable algorithm for particular apex with regard to specific parameters of its phyllotactic system.
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Stallard, J., J. H. Henshaw, B. Lomas, and R. Poiner. "The ORLAU VCG (variable centre of gravity) swivel walker for muscular dystrophy patients." Prosthetics and Orthotics International 16, no. 1 (April 1992): 46–48. http://dx.doi.org/10.3109/03093649209164307.

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Swivel walkers are being increasingly used for muscular dystrophy patients in order to prolong the period of their ambulation. Existing designs did not address the special problems of accommodating such patients comfortably and providing the easier and more assured ambulation which their weakened condition requires. The ORLAU VCG (variable centre of gravity) swivel walker has been developed so that the walking mechanics can be adjusted independently of patient posture. Additional patient support features permit the patient to be secured in their chosen position of comfort prior to setting the ambulation mechanics. Patients using the device, which is now approved for supply by the Department of Health in England and Wales, have improved their walking performance and extended their period of walking.
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Remiorz, Eryk. "Determination of Critical Rock Mass in a Bucket of a Dinting Loader." Archives of Mining Sciences 62, no. 3 (September 1, 2017): 531–43. http://dx.doi.org/10.1515/amsc-2017-0039.

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AbstractThe extraction of hard coal deposits lying in increasing depth causes significant problems with maintenance of roadways (maingates, tailgates, etc.). The reduction of the cross section of such excavations, caused by the floor upheaval, leads to the occurrence of many problems with transport and ventilation. Dinting loaders are employed to restore the original size of roadways tightened due to the activity of adverse stresses occurring in the rock mass. These are tracked machines, usually with small width of about 1 m. They often work in roadways with high longitudinal and lateral inclination, as a result of which they are especially susceptible to overturning.The article presents a mathematical model allowing to determine the critical mass of broken rock in a bucket. The model also allows to determine spatial coordinates of a dinting loader’s centre of gravity depending on temporary position of movable elements of the loader such as a turntable, boom, coupler and bucket, and depending on the level of loading the bucket with broken rock. It also enables to determine critical angles of the roadways’ longitudinal and lateral inclination. The outcomes of computer studies of variations in the position of the loader’s centre of gravity depending on deflection angles of moving elements of the loader and the mass of broken rock in the bucket are also presented. Variability ranges of spatial coordinates of the centre of gravity of the loader are also established and examples are given for values of the critical mass of broken rock in the bucket.
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Dissertations / Theses on the topic "Lenghwise position centre of gravity"

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Burda, Ondřej. "Měření polohy těžiště jízdních kol." Master's thesis, Vysoké učení technické v Brně. Ústav soudního inženýrství, 2012. http://www.nusl.cz/ntk/nusl-232691.

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The first part of the thesis The measurement of the location of centre of gravity of bicycles is firstly about history and division of bicycles, about the legislation in the Czech Republic concerning the cyclists, about the analysis of accidents of cyclists and lastly about the analysis of the method of the measurement of the location of centre of gravity. The second part of the thesis describes the procedure of calculation of the location of centre of gravity in the chosen incline method and the proposal of measure apparatus. The third part of the thesis occupies with the measurement and processing of concrete values for chosen sample of cyclists on the bicycles which are selected in the way that the results of the location of centre of gravity in the final part of the thesis are compared with the respect to their application during the expert opinion.
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Štěpánek, Tomáš. "Měření polohy těžiště vozidla." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2008. http://www.nusl.cz/ntk/nusl-228353.

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This diploma thesis is devoted to problems of measurement centre of gravity position. At the beginning diploma thesis is created summary of methods to measuring moment of inertia and position measuring of centre of gravity of vehicle. Proposal is in-process on the basis method weighing on oblique position. And measurement is possible in Institute of automotive engineering in Brno. Is proposed measuring platform and preparative for obstruct changes of centre of gravity position at measuring. Measuring procedure is described and is derived formula toward calculation position of gravity centre of vehicle. To troubleshooting parts of platform are elaborate solidity calculations. In final parts diploma thesis are mentioned results from these measurements. Drawing documentation of platform and programme for calculation of centre of gravity of vehicle is enclosed in diploma thesis.
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Kubica, Petr. "Zařízení pro měření výškové polohy těžiště vozidla." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-232123.

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This diploma thesis deals the with measurment of the centre of gravity height position of a road vehicle and its issues. The introduction of this thesis focuses on the determining of the position of the center of gravity and the moment of inertia of a road vehicle. The next part is about creationing of a construction plan and its verification. The thesis contains a sensitivity analysis of this device including its results. The end of the thesis informs about the executed measurment in a laboratory and about recommendations for next measurments.
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Rektořík, Jiří. "Návrh zařízení pro měření výškové polohy těžiště automobilu." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2017. http://www.nusl.cz/ntk/nusl-318821.

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The objective of this diploma thesis is the design of a device that measures the vehicle’s centre of gravity height position. The first part defines individual methods of measurement using various measuring equipment. The next part deals with the definition of requirements for the device and the definition of the design. A stress-strain analysis was executed for selected components. This diploma thesis describes the preparation process of the vehicle and the device for the measurement. The next part is dedicated to the design of the measuring chain and to the evaluation of the results. The thesis concludes with a theoretic analysis of the measurement inaccuracy.
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Rjiba, Amira. "Etude géophysique des systèmes d’effondrement en pull-apart en position d’avant chaîne de la région d’Oulad Boughanem- Kalaat Senam- Kalaa Khesba (Centre Ouest de la Tunisie) : géométrie, jonctions et ressources." Thesis, Rennes 1, 2019. http://www.theses.fr/2019REN1B063.

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L’étude des systèmes d'effondrement en position d’avant chaîne de la région d’Oulad Boughanem - Kalaat Senam - Kalaa Khesba (Centre-Ouest de la Tunisie) est menée, à partir des données de puits pétroliers et des investigations sismiques et gravimétriques. Cette région se caractérise par un agencement de grabens en système de pull-apart dont les jonctions sont jalonnées par des formations triassiques salifères. Les données géophysiques acquises, ont fait l’objet d’une analyse détaillée afin de mieux imager les structures de subsurface et de distinguer les éléments associés à une « tectonique subtile » des structures. Dans une première partie, l’étude porte sur les variations des faciès ainsi que l’organisation des structures profondes sur la base de corrélations lithostratigraphiques. Afin de mieux comprendre la structuration de ces grabens en subsurface, la deuxième partie est dédiée à l’analyse, l’interprétation des données gravimétriques et sismiques disponibles et à la construction d’un modèle 2.5D du graben Kalaat Senam. La combinaison des différents résultats géophysiques issus du traitement et de l'interprétation de l’ensemble de l’information disponible, montre (i) en gravimétrie, après différents types de traitements: calcul de prolongements vers le haut, de dérivée Tilt-derivative, TDX, dérivée horizontale totale (MGH/ SED)), montre l’existence de failles de direction NW-SE, NNW-SSE à NS et NE-SW à EW ; des sources à 4 km de profondeur et des structures "syn-graben cachées", et (ii) en sismique un dédoublement des séries d’âge Eocène-Paléocène (formations El Haria, Chouabine et El Garia), avec un chevauchement remarquable en sub-surface d’âge Mio-Plio-Quaternaire, et un plis-faille au sein du graben Kalaa Khesba. La tectonique syn-graben et la jonction inter-graben ont joué un rôle majeur dans la genèse des plis, des failles, ainsi que la mise en place des corps salifères. A la lumière de l’analyse des données géophysiques et la modélisation du système, des pistes d’améliorations de l’interprétation de la structure géologique du sous sol sont proposées en vue d’orienter les futures explorations
The study of grabens in the forward position of the region of Oulad Boughanem - Kalaat Senam - Kalaa Khesba (Central West of Tunisia) is conducted, based on oil well data and seismic and gravimetric investigations. This region is characterized by a combination of grabens in a pull-apart system whose junctions are marked by saliferous triassic formations. The acquired geophysical data was subjected to a detailed analysis in order to better picture subsurface structures and to distinguish the elements associated with “subtle tectonics” from structures. In the first part, the study focuses on the variations of facies as well as the organisation of deep structures on the basis of lithostratigraphic correlations. In order to better understand the structure of these grabens in subsurface, the second part is dedicated to the analysis, the interpretation of the available gravimetric and seismic data and the construction of a 2.5D model of the Kalaat Senam Graben. The combination of the different geophysical results obtained from the processing and the interpretation of all available information, shows (i) in gravimetry, after different types of treatments: calculation of extensions upwards, Tilt-derivative derivative, TDX, total horizontal derivative (MGH/ SED)), shows the existence of directional faults NW-SE, NNW-SSE to NS and NE-SW to EW; sources at 4 km of depth and "hidden syn-graben" structures, and (ii) In seismic, a split of the Eocene-Paleocene age series (El Haria, Chouabine and El Garia formations), with a remarkable overlap in sub-surface Mio-Plio-Quaternary age, and a thrust and strike-slip in the Graben Kalaa Khesba. Syn-graben tectonics and the inter-graben junction played a major role in the genesis of folds, faults, as well as the placement of saliferous bodies. In the light of the analysis of the geophysical data and the modelling of the system, ways of improving the interpretation of the geological structure of the subsoil are proposed in order to guide future explorations
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Book chapters on the topic "Lenghwise position centre of gravity"

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Braune, Wilhelm, and Otto Fischer. "Determining the Position of the Centre of Gravity in the Cadaver." In On the Centre of Gravity of the Human Body, 11–46. Berlin, Heidelberg: Springer Berlin Heidelberg, 1985. http://dx.doi.org/10.1007/978-3-642-69611-4_2.

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Braune, Wilhelm, and Otto Fischer. "Determining the Position of the Centre of Gravity in the Living Body in Different Attitudes and with Different Loads." In On the Centre of Gravity of the Human Body, 47–94. Berlin, Heidelberg: Springer Berlin Heidelberg, 1985. http://dx.doi.org/10.1007/978-3-642-69611-4_3.

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Danek, Wojciech, Mariusz Pawlak, and Damian Gąsiorek. "Model Tests of the Effect of the Column Centre of Gravity Position on the Value of the Passive Safety Coefficient ASI During Impact." In Modelling in Engineering 2020: Applied Mechanics, 43–52. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-68455-6_4.

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Lester, A. R. "Determination of position of centre of gravity." In Merchant Ship Stability, 59–67. Elsevier, 1985. http://dx.doi.org/10.1016/b978-0-408-01448-9.50009-5.

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"THE EFFECT OF CENTRE OF GRAVITY POSITION." In The Paths of Soaring Flight, 111–15. PUBLISHED BY IMPERIAL COLLEGE PRESS AND DISTRIBUTED BY WORLD SCIENTIFIC PUBLISHING CO., 1999. http://dx.doi.org/10.1142/9781848160897_0013.

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Reinecke, S., G. Weisman, and M. H. Pope. "Effects of body position and centre of gravity on tolerance of seated postures." In Hard Facts about Soft Machines:, 165–71. CRC Press, 2020. http://dx.doi.org/10.1201/9781003069461-18.

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Lowrie, William. "5. Gravity and the figure of the Earth." In Geophysics: A Very Short Introduction, 69–91. Oxford University Press, 2018. http://dx.doi.org/10.1093/actrade/9780198792956.003.0005.

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‘Gravity and the figure of the Earth’ discusses the measurement of gravity and its variation at the Earth’s surface and with depth. Gravity is about 0.5 per cent stronger at the poles than at the equator and it first increases with depth until the core–mantle boundary and then sinks to zero at the Earth’s centre. Using satellites to carry out geodetic and gravimetric observations has revolutionized geodesy, creating a powerful geophysical tool for observing and measuring dynamic processes on the Earth. The various measurement techniques employed fall in two categories: precise location of a position on the Earth (such as GPS) and accurate determination of the geoid and gravitational field. Bouguer and free-air gravity anomalies and isostasy are explained.
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Gallent, Nick. "A wicked problem." In Whose Housing Crisis?, 23–46. Policy Press, 2019. http://dx.doi.org/10.1332/policypress/9781447345312.003.0002.

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Delivering broader access to decent, affordable housing is a wicked problem – a seemingly intractable challenge that has incubated in a political space. There are numerous competing explanations of the housing cost crisis and each explanation reveals a particular political leaning and a preference for either incremental action (aimed at protecting the status quo) or deeper structural change, which would be difficult to achieve given that the housing crisis is differently experienced depending on the market position of particular groups and actors (generating divergent self-interest). This chapter unpacks the nature of the housing crisis as a wicked problem, showing how and why remedies are highly contested and single actions are unlikely to deliver the fundamental change that is needed – largely because housing has become the centre of economic gravity in many countries, owing to the financialisation of land and housing and increased reliance on asset sheet growth, as a substitute for productivity growth.
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Conference papers on the topic "Lenghwise position centre of gravity"

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More, Rohit R., K. Senthilkumar, and M. W. Trikande. "Effect of Position of Centre of Gravity on Stability of Armoured Vehicle During Amphibious Operation." In 5th International Congress on Computational Mechanics and Simulation. Singapore: Research Publishing Services, 2014. http://dx.doi.org/10.3850/978-981-09-1139-3_230.

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Sankunny, Surendran, and Kannan Chandrabose. "Application of Composites for Ship Structural Parts." In ASME 2010 29th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2010. http://dx.doi.org/10.1115/omae2010-21079.

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In the past, there were very serious casualties under the actions of extreme waves including loss of precious lives. There are cases like loss of M V Derbyshire (Faulkner, 2001) due to hatch cover failure in extreme weather conditions. Use of composite materials in marine fields as major or minor components off floating platforms is discussed in this paper. Application of composites on board ships reduces the self weight and lowers the position of vertical centre of gravity of the floating vessel. There are advantages in using composite structures in marine environment. A link-span fitted with a composite deck and the feasibilities of using composite for hatch covers of bulk carrier ship is described in this paper. In the case of bulk carriers, failure of hatch cover especially in the forward part of the vessel leads to flooding of the forward cargo compartment and occasionally results in fatal casualty. The foremost hatch cover and the next one within 25% length of the vessel.
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Saghafi, Fariborz, and Afshin Banazadeh. "Transition Flight Feasibility of a Fluidic Thrust Vectored Aerial Tail-Sitter: Numerical Approach." In ASME Turbo Expo 2007: Power for Land, Sea, and Air. ASMEDC, 2007. http://dx.doi.org/10.1115/gt2007-28198.

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This paper describes a feasibility study of using numerical analysis technique, coupled with a non-linear simulation model of a conceptual fluidic-thrust-vectored unmanned aerial tail-sitter to obtain required thrust deflection angles for a transition manoeuvre in take-off. It also studies the aircraft behaviour in transition subjected to the changes in specified parameters like the thrust value and the engine distance from the centre of gravity. The focus of the research presented was to get the vehicle from zero speed on the ground, in vertical position, to a specified velocity at a specified attitude, in cruise position. It was also specified that, when the vehicle was considered to be flying, it should not reduce speed or be descending and that its angle of attack should remain within a reasonable bound, since extreme angle of attack region causes the simulation and analysis to fall in the uncertain zone. The aircraft pitch attitude was also specified to decrease steadily in every integration step regarding the aircraft velocity. The transition problem was mathematically constructed and coded into Matlab/Simulink for the purpose of analysis and simulation. The inputs to the simulation program were simply series of thrust deflection angles at a number of different instants of time. Simulation was performed for a constant vehicle configuration. It was found that transition was feasible for the thrust to weight ratio around 1.0947 and it took 15 seconds to accomplish, while no attempt was made for time optimization.
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Bashir, Musa B., Longbin Tao, Mehmet Atlar, and Robert S. Dow. "Experimental and Numerical Investigation of the Wave-Induced Loads on a Deep-V Catamaran in Regular Waves." In ASME 2013 32nd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/omae2013-10212.

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This paper presents the results of towing tank tests carried out to predict the wave loads in regular wave conditions on a Deep-V hull form catamaran model. The experiments were carried out at the Newcastle University towing tank using a segmented model of the university’s new research vessel, “The Princess Royal”. The vessel is a twin hull with a Deep-V shape cross-section. The model, divided into two parts at the cross-deck level, was fitted with a 5-axis load cell at the position of the vessel’s centre of gravity in order to measure the motions response and wave loads due to the encountered waves. The longitudinal, side and vertical forces, along with the prying and yaw splitting moments were measured. The results obtained were further compared with those from numerical predictions carried out using a 3D panel method code based on potential flow theory that uses Green’s Function with the forward speed correction in the frequency domain. The results highlight reasonable correlations between the measurements and the predictions as well as the need for a proper understanding of the response of the multihull vessels to the wave-induced loads due to the non-linearity that have been observed in the experimental measurements of wave loads.
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Duhar, G., and C. Colin. "Dynamics of Vapor Bubble Growth and Detachment in a Channel Flow." In ASME 2006 2nd Joint U.S.-European Fluids Engineering Summer Meeting Collocated With the 14th International Conference on Nuclear Engineering. ASMEDC, 2006. http://dx.doi.org/10.1115/fedsm2006-98505.

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The aim of this study is to improve the knowledge of the dynamics of vapor bubbles growing on a wall in a shear flow. Vapor bubbles are created on a hot film probe flushed mounted in the lower wall of a horizontal channel. The film overheat temperature controlled by an anemometer is limited to 20°C to avoid the growth of multiple bubbles. The liquid flow in the channel measured by Particle Image Velocimetry is laminar or turbulent. Bubble growth and detachment in the channel flow are filmed with a high-speed video camera at 2000 frame/second. Image processing allows obtaining the temporal evolutions of the bubble kinematics characteristics: the equivalent radius and the position of the centre of gravity. These data are then used to calculate the bubble growth rate and the forces acting on the bubbles during their growth and after their detachment. After detachment, drag, buoyancy and added mass forces play a dominant role. From the investigation of the bubble trajectories after detachment, the drag coefficient can be determined. When the bubble is attached to the wall capillary forces are dominant. A predictive model for bubble radius at detachment is provided depending on the wall overheat.
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6

Rankin, James, Bernd Krauskopf, Mark Lowenberg, and Etienne Coetzee. "Operational Parameter Study of Aircraft Ground Dynamics." In ASME 2009 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/detc2009-86293.

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The dynamics of passenger aircraft on the ground are influenced by the nonlinear characteristics of several components, including geometric nonlinearities, the aerodynamics and interactions at the tyre-ground interface. We present a fully parametrised mathematical model of a typical passenger aircraft that includes all relevant nonlinear effects. The full equations of motion are derived from first principles in terms of forces and moments acting on a rigid airframe, and they include implementations of the local models of individual components. The overall model has been developed from and validated against an existing industry-tested SimMechanics model. The key advantage of the mathematical model is that it allows for comprehensive studies of solutions and their stability with methods from dynamical systems theory, in particular, the powerful tool of numerical continuation. As a concrete example, we present a bifurcation study of how fixed-radius turning solutions depend on the aircraft’s steering angle and centre of gravity position. These results are represented in a compact form as surfaces of solutions, on which we identify regions of stable turning and regions of laterally unstable solutions. The boundaries between these regions are computed directly and they allow us to determine ranges of parameter values for safe operation. The robustness of these results under the variation of an additional parameter, specifically, the engine thrust is investigated. Qualitative changes in the structure of the solutions are identified and explained. Overall our results give new insight into the possible turning dynamics of the aircraft in dependence on three parameters of operational relevance.
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7

Naciri, Mamoun, Walter Maurel, and Jean-Pierre Que´au. "Passive Disconnection of an SPM-Moored LNG Carrier in Waves." In ASME 2005 24th International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2005. http://dx.doi.org/10.1115/omae2005-67105.

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The Soft Yoke Mooring and Offloading system (SYMO®) has been developed in SBM to allow the tandem mooring of an LNG carrier to the stern of an LNG FPSO or a Floating, Storage & Regasification Unit in harsh environments. The SYMO® system consists of two mooring legs supported by a crane. A yoke structure is suspended at the bottom of the two mooring legs by uni-joints. The tip of the yoke is connected to the bow of the LNG carrier via roll, pitch and yaw articulations. When connected the yoke structure is horizontal. Upon disconnection, the yoke settles at an equilibrium position characterized by a pitch angle of 35° to 40° with respect to the horizontal. Owing to the low friction articulations, the yoke oscillations decay very slowly and the yoke may come too close to the LNG carrier bow. A passive system has been developed to improve the SYMO® dynamics at disconnection whereby a small proportion of the overall yoke weight is replaced by water. This water is allowed to move in a suitably designed tank network thus shifting around the overall centre of gravity and yoke equilibrium angle as pitch oscillations take place. The above principle has first been investigated using a kinematics program before being model tested at a large scale of 1:16. A large matrix of tests has been performed to investigate the effect of the water ballast volume and the layout of the tank network. Once the principle was confirmed experimentally, CFD computations were performed in a blind fashion and compared to the experiments.
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