Relevant bibliographies by topics / Height position centre of gravity

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

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

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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

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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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Kono, Kengo, and Norihiko Saga. "Development of a Passive Turn Type Skiing Robot with Variable Height Mechanism of Gravitational Center." Journal of Robotics and Mechatronics 24, no. 2 (April 20, 2012): 372–78. http://dx.doi.org/10.20965/jrm.2012.p0372.

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In recent years, sports engineering has become an active area of research. It has produced important contributions of many kinds in the development of sports. Ski turns have been investigated from various viewpoints such as the motion analysis of skiers and ski robots and dynamic simulation. Nevertheless, despite considerable research, the mechanisms of ski turns remain to be completely elucidated. Mechanical models derived using approximate expressions do not, furthermore, match alpine ski turns and results are therefore not reflected concretely. To facilitate theoretical considerations, a passive skiing robot was developed. Influences on ski turns, such as the position of the center-of-gravity, can be examined easily using this robot. In a passive turn type of ski robot, a difference in the turn cycle appeared in a difference in leg height. We noticed the influence of turning in the difference in the center-of-gravity height and appended mechanism to change the height of the legs to a passive turn type of ski robot in order to verify whether turns can be controlled by changing the position of the gravitational center. As described here, we examined ski turn dynamics to help skiers improve their athletic performance.
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Tsarik, Ruslan Stanislavovich, and Denis Aleksandrovich Akmaykin. "EVALUATION OF INFLUENCE OF CONTAINER�S CENTER OF GRAVITY POSITION ON CONTAINER SHIP�S METACENTRIC HEIGHT." Vestnik Gosudarstvennogo universiteta morskogo i rechnogo flota imeni admirala S. O. Makarova 8, no. 6 (December 28, 2016): 58–70. http://dx.doi.org/10.21821/2309-5180-2016-8-6-58-70.

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MacDonald, G. B., and R. R. Forslund. "Application of a geometrical volume equation to species with different bole forms." Canadian Journal of Forest Research 16, no. 2 (April 1, 1986): 311–14. http://dx.doi.org/10.1139/x86-052.

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Stem analysis of 20 Abiesbalsamea (L.) Mill., 68 Piceamariana (Mill.) B.S.P., 19 Piceaglauca (Moench) Voss, 31 Populustremuloides Michx., and 37 Betulapapyrifera Marsh. revealed form variation between species. A volume equation based on the paracone (a geometrical solid midway between a paraboloid and a cone) estimated individual tree volume within 10% of the true volume (at the 95% confidence level) for all species. The input variables required were total height and diameter at a relative height of 0.2 for Betulapapyrifera and 0.3 for the other four species. If breast-height diameter was used, the effect of form variation on the accuracy of volume prediction was more pronounced. In this case, the geometrical equation modified for each species according to the average centre of gravity provided more consistently accurate volume estimates than either the paracone equation or Honer's transformed variable equation. For all species, the diameter measurement position was more critical than the version of the geometrical equation selected.
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Shabani, Babak, Jason Lavroff, Damien S. Holloway, Michael R. Davis, and Giles A. Thomas. "The influence of the centre bow and wet-deck geometry on motions of wave-piercing catamarans." Proceedings of the Institution of Mechanical Engineers, Part M: Journal of Engineering for the Maritime Environment 233, no. 2 (February 1, 2018): 474–87. http://dx.doi.org/10.1177/1475090217753761.

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The effects of tunnel height and centre bow length on the motions of a 112-m wave-piercer catamaran with an above-water centre bow were investigated through model tests. Five alternative centre bow configurations were considered, and multiple series of model tests were conducted in regular head sea waves. The results showed that both heave and pitch increased over a wide range of wave encounter frequency as the wet-deck height of the catamaran model increased. However, increasing the length of the centre bow showed an increase in the pitch but a decrease in the heave for a limited range of wave encounter frequency near the heave and pitch resonance frequencies of the catamaran model. The positions of minimum vertical displacement were found to be aft of the longitudinal centre of gravity, between 20% and 38% of the overall length from the transom. Increase in the wet-deck height and consequently the archway clearance between the main hulls and centre bow also resulted in an increase in the vertical displacement relative to the undisturbed water surface in the centre bow area. The results also indicated the vulnerability to wet-deck slamming for the different bow and wet-deck designs.
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Kyselovičová, Oľga, and Erika Zemková. "Postural Stability in Aerobic Gymnastics Specific Positions." Sport Science Review 19, no. 3-4 (August 1, 2010): 109–16. http://dx.doi.org/10.2478/v10237-011-0020-0.

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Postural Stability in Aerobic Gymnastics Specific Positions The study compares the effect of maximal jumps and sport-specific exercises on parameters of balance. Two balance elements (free support vertical split and frontal split) were analyzed in a group of 8 aerobic gymnasts (average age = 17,0 ± 1,3 years, average body height = 163,0 ± 6,9 cm, average body weight = 54,5 ± 6,12 kg, BMI 20,4 ± 1,46 kg.m-2). The FiTRO Sway Check stabilographic system, allowing the monitoring of horizontal movement of centre of gravity with the help of dynamometric board, was used for assessment. Stabilographic parameter of the velocity of the centre of pressure (mean and in antero-posterior and medio-lateral directions) was registered at 100 Hz. The results show significant differences in average sway length in medio-lateral and antero-posterior direction, in both analysed difficulty elements. This indicates that balance impairment after exercise and its readjustments to pre-exercise level depends not only on intensity of proprioceptive stimulation but also on type of exercise.
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Laszlo, Robert, Cristian Radeanu, Stefan Ilici, Mircea Grecea, and Miklos Levente. "Technical and safety aspects at the demolition by blasting works of a cooling tower with a high of 72.00 m." MATEC Web of Conferences 305 (2020): 00072. http://dx.doi.org/10.1051/matecconf/202030500072.

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From the point of view of demolition, one of the most interesting construction categories is the hyperboloid shape cooling towers. These seemingly fragile structures support at the base on a reinforced concrete belt and pillars. An important element to be taken into account when choosing the demolition solution is the slope of the tower. As this ratio between tower height and base diameter is greater (4-5), the easier is the demolition of the tower by overturning, respectively by moving the centre of gravity of the construction away from its base. In the case of the cooling tower described in this article, its height was 72.00 m and the base diameter of 52.00 m - the slope ratio index being less than 2, which was why the chosen solution of demolition was that of partial lateral collapse followed by a total crash of the tower on its position. The article describes how to perform the demolition of the cooling tower, the technical and safety solutions adopted for its successful collapse in the intended direction, in very sensitive location conditions regarding the constructions and installations in its immediate vicinity.
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NIIMI, Hirofumi. "Relationship between the position of the center of gravity of the crawler robot and the step height that can be climbed." Proceedings of JSME annual Conference on Robotics and Mechatronics (Robomec) 2018 (2018): 1P2—F05. http://dx.doi.org/10.1299/jsmermd.2018.1p2-f05.

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QI, HUIRONG, and MEI LIU. "APPLICATION OF A ONE-DIMENSIONAL POSITION SENSITIVE CHAMBER ON SYNCHROTRON RADIATION." International Journal of Modern Physics: Conference Series 27 (January 2014): 1460142. http://dx.doi.org/10.1142/s2010194514601422.

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In the last few years, wire chambers have been frequently used for X-ray detection because of their low cost, large area and reliability. X-ray diffraction is an irreplaceable method for powder crystal lattice measurements. A one-dimensional single-wire chamber has been developed in our lab to provide high position resolution for powder diffraction experiments using synchrotron radiation. There are 200 readout strips of 0.5 mm width with a pitch of 1.0 mm in the X direction, and the working gas is a mixture of Ar and CO2 (90/10). The one-dimensional position of the original ionization point is determined by the adjacent strip's distribution information using the center of gravity method. Recently, a study of the detector's performance and diffraction image was completed at the 1W1B laboratory of the Beijing Synchrotron Radiation Facility (BSRF) using a sample of SiO2. Most of the relative errors between the measured values of diffraction angles and existing data were less than 1%. The best position resolution achieved for the detector in the test was 71 μm (σ value) with a 20 μm slit collimator. Finally, by changing the detector height in incremental distances from the center of the sample, the one-dimensional detector achieved a two-dimensional diffraction imaging function, and the results are in good agreement with standard data.
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SWATERS, GORDON E. "Dynamics of radiating cold domes on a sloping bottom." Journal of Fluid Mechanics 364 (June 10, 1998): 221–51. http://dx.doi.org/10.1017/s0022112098001049.

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Numerical simulations of benthic gravity-driven currents along continental shelves suggest they exhibit considerable time and spatial variability and tend to organize themselves into large-scale bottom-intensified cold domes or eddies. Attempts to derive simple relations governing the evolution of the spatial moments of the mass equation for baroclinic eddies have failed because it is not clear how to express the form or wave drag stresses associated with the excited (topographic) Rossby wave field in the surrounding fluid in terms of the eddy moments. We develop a simple model for the leading-order time evolution of a cold dome configuration which initially nearly satisfies the Mory–Stern isolation constraint. As the topographic Rossby wave field in the surrounding fluid interacts with the cold dome, higher azimuthal modes are excited within the cold dome which develop into spiral-like filamentary structures on the eddy boundary. The trajectory followed by the position of the maximum height of the cold dome corresponds to sub-inertial along- and cross-slope oscillations superimposed on a mean along-slope drift (well described by the Nof velocity). Nevertheless, the theory suggests that there are no oscillations (at least to second order) in the horizontal spatial moments of the eddy height, that is, the centre of mass of the eddy moves steadily in the along- and down-slope directions (i.e. ‘southwestward’ relative to the topographic β-plane). The theoretical analysis is in good agreement with a nonlinear numerical simulation which we present.
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Dissertations / Theses on the topic "Height 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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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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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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Hanych, Jaroslav. "Konstrukční návrh zařízení pro měření výškové polohy těžiště vozidla." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2018. http://www.nusl.cz/ntk/nusl-378015.

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This master's thesis deals with problems connected with measuring vehicle centre of gravity height. The research part summarizes generally known methods of measuring vehicle centre of gravity and moments of inertia. Essential part of this thesis is the design of a device for measuring the centre of gravity height of a road vehicle on a principle of measuring a period of oscillation. The height position of the platform of the device is adjustable through hydraulic cylinders. A stress-strain analysis of the design was executed through a combination of analytical methods and a finite element method. The process of measurement was described and an equation for determination of centre of gravity height was deduced. Error of measurement was estimated based on the knowledge of partial errors of measured values.
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Fedra, Tomáš. "Měření výškové polohy těžiště vozidla." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2010. http://www.nusl.cz/ntk/nusl-228902.

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This diploma thesis deals with measurement of vehicle centre of gravity height position. All methods for measurement of CG height position are described in the first part. The second part deals with designing of device for measurement of CG height. This measurement device is analysed by Finite Element Method. The vehicle is tilt by hydraulic system. The third part shows the best tilt angle for minimal error of CG height. At the end, there is described a measuring procedure for designed device.
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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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Books on the topic "Height position centre of gravity"

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Wittman, David M. Potential. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780199658633.003.0015.

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At any given event gravity accelerates all particles equally—yet gravity is very strong in some places and very weak in others. In this chapter, we learn a powerful thinking tool to help us deal with these variations: the gravitational potential. The potential takes the concept of “acceleration times height” that, we previously found, determines the march of time and generalizes it to cases where the gravitational acceleration varies with position. The potential encodes global relationships, such as the gravitational redshift of light emitted from one point and received by a distant observer, as well as the local acceleration at each point.We also showhow the spacetime metric is affected by the potential. Incorporating the potential into themetric neatly unites gravity with relativity and eliminates any need for a theory of gravity involving forces.
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Book chapters on the topic "Height 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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Coates, John. "The Effect of Bilge Water on Displacement, Vertical Centre of Gravity and Metacentric Height of Olympias in the Trial Condition." In Trireme Olympias, 182–84. Oxbow Books, 2012. http://dx.doi.org/10.2307/j.ctvh1dqmv.30.

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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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Furbish, David Jon. "Inviscid Flows." In Fluid Physics in Geology. Oxford University Press, 1997. http://dx.doi.org/10.1093/oso/9780195077018.003.0014.

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This chapter covers an important step toward our development of dynamical equations of fluid motion. Herein we will develop explicit expressions for the forces that produce the fluid accelerations that we described kinematically in Chapter 7. In particular, we will consider the behavior of inviscid fluids. Viscous forces therefore are not involved; accelerations are wholly due to body forces and normal surface forces associated with fluid pressure. The results of our development are Euler’s equations, or the momentum equations for inviscid flow. One consequence of the inviscid assumption is that slip flow may occur at real boundaries, in contrast to the no-slip condition that occurs with real fluids. This is unrealistic for the viscous flows of interest in many geological problems. Nonetheless, situations exist in which viscous fluids can be treated as inviscid. Examples include fluids having small viscosity, and flows far from boundaries. The study of inviscid flow therefore is justified in its own right. A particularly important example involves the consideration of how velocity and pressure vary along a streamline, which leads to Bernoulli’s equation. Consider a rectangular control volume with edges of length dx, dy, and dz embedded within a local Cartesian coordinate system. This local system has an arbitrary orientation with respect to the Earth coordinate system; the x-axis is inclined at an angle α measured from the horizontal. Acceleration due to gravity g acts vertically, and the centroid of the control volume is at height h above a horizontal datum. The height h provides a measure of the position of the fluid within the gravitational field. Consider, now, forces acting on the control volume parallel to the x-axis. The weight W of fluid within the control volume possesses a component Wx parallel to the x-axis: . . . Wx = −ρg sin α dx dy dz . . . . . . (10.2) . . . where ρ is the fluid density, and the negative sign indicates that Wx acts in the direction of negative x.
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Conference papers on the topic "Height 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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Tsunazawa, Yuki, Tingwei Wang, Kenichiro Torige, and Chiharu Tokoro. "DEM Simulation for Specific Gravity Separation of Plastic Particles Using Air-Table." In ASME-JSME-KSME 2011 Joint Fluids Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/ajk2011-35010.

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Air-table is one of the specific gravity separators which have been expected as an effective dry separator for waste products such as plastic or glass. The objective of this study is an application of DEM to describe the basic behavior of plastic particles in an air-table separation. The mechanism of particles separation on the table has not been well-known because air-table contains many instrument parameters such as slope and shape of the table, height of the riffle, angle, amplitude and frequency of vibration and wind velocity. In this study, two types of particles which have same diameter and different density were simulated and 3 dimensional position and velocity of them were investigated in the various conditions of instrumental parameters. DEM simulation results showed that the riffle on the table play an important role for the particles separation.
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Cerantola, D. J., and A. M. Birk. "Study of Tabs in a Short Annular Diffuser With a Strong Swirling Flow." In ASME Turbo Expo 2014: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/gt2014-25567.

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Passive augmentation devices are typically added to diffusers to increase pressure recovery; however, applications such as infrared suppression exist where more uniform outlet velocity profiles are also desirable. Square tabs were added to a short annular diffuser system with diffuser effectiveness of 80% in strong swirling subsonic turbulent flow. The number, axial position, width, and height were varied for the tabs with a 135° orientation angle. Results showed that back pressure increased linearly with increasing tab projected area blockage but outlet velocity uniformity was maximum with 7% tab blockage. Tabs placed on the centre body base recovered more dynamic pressure than tabs placed downstream on the centre body with similar tab area blockage.
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Grzebieta, Raphael, David Young, Andrew McIntosh, and Michael Bambach. "Occupant Injuries and Roof Strength in Rollover Crashes." In ASME 2008 International Mechanical Engineering Congress and Exposition. ASMEDC, 2008. http://dx.doi.org/10.1115/imece2008-68739.

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This paper shows how a mathematical relationship can be derived linking serious neck injuries to excessive roof deformation and that this relationship depends on the vehicle’s Centre of Gravity (COG) lateral velocity at the moment of touchdown of the vehicle’s roof structure. The relationships have been greatly simplified for an idealized condition to facilitate derivation of the equations. In the case of a very strong roof, occupant neck loading resulting from torso augmentation reaches a threshold value that depends on the coefficient of friction between the road surface and the vehicle’s steel body or tires and the height the vehicle’s COG drops during a quarter turn impact sequence.
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Dimas, Athanassios A. "Large-Wave Simulation of Surface Tension Effect on Weak Spilling Breakers." In ASME 2005 24th International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2005. http://dx.doi.org/10.1115/omae2005-67278.

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The effect of surface tension on the evolution of weak spilling breakers is studied by performing large-wave simulations (LWS) of the free-surface flow developing by the interaction of a gravity free-surface wave and a surface shear-layer current. The flow models the evolution of gravity waves under the influence of wind shear. The surface tension modifies the dynamic free-surface condition and its effect depends on the dimensionless Weber number. The Euler equations are filtered according to the LWS formulation and solved numerically by a spectral method and a fractional-time-step scheme. The results indicate a stronger surface tension effect with decreasing Weber number values and increasing initial wave height. Specifically, decreasing the Weber number alters the size and shape of the characteristic bulge of spilling breakers and the toe position resulting in sharper slopes and angles of the free surface profile. The spiller wave height is reduced with decreasing Weber number.
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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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Hu, Hanhong, and Ning Ma. "Numerical Simulation on Nonlinear Evolution of Rogue Waves on Currents Based on the NLS Equation." In ASME 2011 30th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2011. http://dx.doi.org/10.1115/omae2011-50079.

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In this paper, nonlinear instability and evolution of deep-water rogue waves on following and opposing currents were described by numerical simulation for laboratory investigation. The generation of rogue waves in a numerical tank by means of wave focusing technique had been studied. Here a spatial domain model of current modified nonlinear Schro¨dinger (NLSC) equations in one horizontal dimension (1D) was established for describing the deep-water wave trains in a prescribed stationary current field. The transient water waves (TWW) was adopted as the initial condition of the NLSC equation. The steady current was added to see the effect of wave-current interaction on the energy concentration of gravity waves. The influence of current as well as other terms in the NLSC equations on wave height, inclination, particle velocity and acceleration are shown. Meanwhile, the focusing time/position of TWW influenced by the current field is investigated, which is of course a very important factor in experimental research when we generate rogue waves in the laboratory.
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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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KARLOVSKA, Amanda, Inga GRĪNFELDE, Ina ALSIŅA, Gints PRIEDĪTIS, and Daina ROZE. "PLANT REFLECTED SPECTRA DEPENDING ON BIOLOGICAL CHARACTERISTICS AND GROWTH CONDITIONS." In Rural Development 2015. Aleksandras Stulginskis University, 2015. http://dx.doi.org/10.15544/rd.2015.045.

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Sustainable and economically based forestry needs modern inventory and monitoring techniques. One of the most common technologies for identification of forest tree species and monitoring of forest growth conditions is the hyperspectral remote sensing. This technology gives an opportunity to economize human resources and time for data collecting and processing. The spectral behaviour of plant leaves depends on number of factors, including environmental background. The aim of this study was to assess the tree reflectance spectra in relation to the growth conditions to take into account potential differences for increasing precision of species identification in Latvian forests and for estimating of forest growth conditions. Remote sensing data were obtained using a specialized aircraft (Pilatus PC-6), which is equipped with a high-performance airborne VNIR pushbroom hyperspectral system (AisaEAGLE). The study area was flown at 1000 m altitude. Data was recorded in the 400–970 nm spectral range, spectral resolution was 3.3 nm, ground resolution 0.5 m. Data processing consisted of manually selecting trees with a recognizable tree crowns in the airborne images. Tree centres were adjusted by putting them in the accurate position according to the situation in aerial photography. All trees with a diameter at breast height DBH of more than 5 cm were measured and for each tree coordinates, its species, height, DBH, crown width and length were recorded. Differentially corrected Global Positioning System measurements were used to determine the position of each plot centre. Data from different hyperspectral bands were compared using ANOVA at confidence level 95 %. Four species: Scots pine (Pinus sylvestris L.), Norway spruce (Picea abies (L.) H. Karst), silver birch (Betula pendula Roth), and European aspen (Populus tremula L.) – were examined in distinct forest site types. The spectral response of studied species was 1) different between species and 2) different between site types within each species, correlating with soil fertility gradient and soil moisture gradient. Differences between species occurred most in the intensity of reflected electromagnetic radiation rather than distinctive locations of maximums or minimums in spectrum curve, and near infrared (NIR) region of spectrum showed more differences between species than visible light zone. Most informative wavebands for distinguishing differences between site types were 805 nm and 644 nm.
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10

Costarella, Marianna, Lucilla Monteleone, Roberto Steindler, and Stefano Maria Zuccaro. "Physical and Psychical Conditions Decline of Older People With Age, Measured by Functional Reach Test and by Mini Mental State Examination." In ASME 2008 9th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2008. http://dx.doi.org/10.1115/esda2008-59055.

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There are several tests to value the psychophysical characteristics of older people and, among all, the most suitable to this aim are here considered the Functional Reach (FR) test, as an index of the aptitude to maintain balance in upright position, and the Mini Mental State Examination (MMSE), as a global index of cognitive abilities. The sample of older people we have analysed concerns 50 healthy subjects divided into three groups according to the age (15 from 55 to 64 years old, 19 from 65 to 74 years old, and 16 more than 75 years old); they underwent a FR test, which consists first in the measurement of the anthropometric characteristics, then in the execution of the test itself, and finally in the study of the upright posture carried out analysing the Centre of Pressure (COP) trend; they underwent as well a MMSE to value the main areas of the cognitive function concerning the space-temporal orientation, the short-term memory, the attention ability, the calculus ability and the praxis-constructive ability. The results of these tests show, according to the age, a loss both of the physical performances (FR, FR related to height, and COP displacement), and of the cognitive abilities (MMSE); however, in all cases, the only significant changes are those between the first and the other two groups of age. A comparison between the results of male and female subjects inside the three groups, although the results of the males are generally superior to the female ones, is never significant; moreover, the differences of the FR tests, in particular, are completely not significant if compared to the height of the subjects. Finally, a comparison between FR and MMSE shows a quicker decline of the physical performances with regard to the cognitive ones.
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