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Academic literature on the topic 'Hull Body'
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Journal articles on the topic "Hull Body"
1
Utama, I. Ketut Aria Pria, S. Sutiyo, and Bagiyo Suwasono. "Wind Tunnel Investigation into the Resistance Analysis of Slender Body Catamaran." Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan 17, no. 2 (2020): 65–73. http://dx.doi.org/10.14710/kapal.v17i2.29867.
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The Wind tunnel investigation of a slender body catamaran was conducted in order to determine its resistance characteristics, namely the effect of pressure and flow velocity changes for varied hull separation. The catamaran was tested in a wind tunnel belongs to Department of Mechanical Engineering, ITS, with hull separations of S/L = 0.2 to 0.4 and variation in Reynolds numbers up to 4.46 x 105. Pressure around the hull was measured using pressure tappings and the flow velocity behind the hull was also measured using a Pitôt-static tube. The experimental study shows that the pressure coefficient decreases when the hull separation declines and conversely, the flow velocity increases. The tests demonstrated a viscous interaction between the hulls, and form factors for the monohull and catamaran are derived. The demihull exhibited a form factor (1+k) of 1.265 and in the catamaran mode, the measured form factor (1+βk) was between 1.416 and 1.403. The results are in agreement with other published data.
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Murib, Sandro, M. Najoan, Betty Bagau, and Ivone M. Untu. "PENGARUH SUBSTITUSI DEDAK HALUS DENGAN TEPUNG KULIT KOPI DALAM RANSUM TERHADAP PERFORMA BROILER." ZOOTEC 35, no. 2 (2015): 218. http://dx.doi.org/10.35792/zot.36.1.2016.10472.
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ABSTRACT THE EFFECTS OF SUBSTITUTION OF RICE BRAN AND COFFEE HULL MEAL IN RATION ON BROILER PERFORMANCE The effects of looking for alternative feed to variate feed ingredients for ration formulation is steel on going. The utilization of agricultural waste products are not maximized yet, although its availability are abundant, one of these agricultural waste products is coffee hull. The research evaluation the effects of rice bran and coffee hull meal in ration on broiler performances has been conducted at Faculty of Animal Science Unsrat Manado for six weeks using 60 broiler strain CP 707. Completely Randomized Design with 4 treatments and 5 replication was used. The treatments were : R0 = substitution of rice bran (0%) or ration with 21 % rice bran + 0% coffee hulls ; R1 = substitution of rice bran (33.33%)or ration with 14 % or ration with + 7% coffee hulls; R2 = substitution of rice bran (66.66%) or ration with 7 % + 14 % coffee huls; R3 = substitution of rice bran (100 %) or ration with0 % rice bran + 21 % coffee hulls. The results showed that there were significant, effects of treatments on feed consumption, body gain and feed conversion. Tukey test showed that the higher proportion of coffee hull meal the lower feed consumption and body gain, on the other land feed conversion of R3 significantly higher compared to R0, R1and R3. Based on feed conversion it can be concluded that rice bran can be substituted by coffee hulls meal up to 66.66% or its utilization up to 14% in the broiler ration. Key words :Broiler, Rice Bran, Coffee Hull , Performance broiler.
3
Esonu, B. O., R. Izukanne, O. O. Emenalom, et al. "Evaluation and economics of enzyme supplementation on the performance of broiler finishers fed soybean hull meal based diets." Nigerian Journal of Animal Production 33, no. 2 (2021): 216–21. http://dx.doi.org/10.51791/njap.v33i2.930.
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Twenty-eight day feeding trial was conducted to evaluate the performance of broiler finisher fed soybean hull based diets supplemented with “Safzyme®”, an exogenous cellulolytic enzyme. Soybean hull also referred to as soyhull, soybean millrun or soybean flakes are by-products of the soybean milling industry. Five broiler finisher diets were formulated such that the diets contained soybean hull meal at 0%, 10% and 20% dietary levels (without enzyme supplementation) and 10%, and 20% dietary levels (with 1.0% enzyme supplementation) respectively. One-hundred and fifty (150) four-week-old Hubbard broiler chicks were divided into five groups of thirty (30) birds each and randomly assigned to five treatment diets in a completely randomized design (CRD). Data were collected on feed intake, body weight gain, feed conversion ratio and economics of production was also computed. Feed intake increased progressively as dietary inclusion of soybean hull was increased with or without enzyme supplementation. This increase became significant (P<0.05) at 20% dietary level of soybean hull. Daily body weight gains of birds on soybean hull meal diets with enzyme supplementation did not significantly differ (P<0.05) from birds on soybean hull meal diets without enzyme supplementation. Feed conversion ratio and feed efficiency were both significant (P<0.05) at 20% dietary levels of soybean hulls with or without enzyme supplementation. Dietary inclusion of soybean hull without enzyme supplementation reduced cost of feed and production of 1kg of meat while enzyme supplementation negatively affected percent feed cost savings. The results of this trial suggest that supplementation of diets containing soybean hull meal at 20% dietary levels with Safztme®, an exogenous cellulolytic enzyme, at 10% dietary level could not improve the nutritive value of the hulls for broiler finisher birds and also affected negatively percent feed cost saving.
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Coatham, Samuel J., William I. Sellers, and Thomas A. Püschel. "Convex hull estimation of mammalian body segment parameters." Royal Society Open Science 8, no. 6 (2021): 210836. http://dx.doi.org/10.1098/rsos.210836.
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Obtaining accurate values for body segment parameters (BSPs) is fundamental in many biomechanical studies, particularly for gait analysis. Convex hulling, where the smallest-possible convex object that surrounds a set of points is calculated, has been suggested as an effective and time-efficient method to estimate these parameters in extinct animals, where soft tissues are rarely preserved. We investigated the effectiveness of convex hull BSP estimation in a range of extant mammals, to inform the potential future usage of this technique with extinct taxa. Computed tomography scans of both the skeleton and skin of every species investigated were virtually segmented. BSPs (the mass, position of the centre of mass and inertial tensors of each segment) were calculated from the resultant soft tissue segments, while the bone segments were used as the basis for convex hull reconstructions. We performed phylogenetic generalized least squares and ordinary least squares regressions to compare the BSPs calculated from soft tissue segments with those estimated using convex hulls, finding consistent predictive relationships for each body segment. The resultant regression equations can, therefore, be used with confidence in future volumetric reconstruction and biomechanical analyses of mammals, in both extinct and extant species where such data may not be available.
5
Leduc, Daniel. "A new nematode species, Chromadorina tangaroa sp. nov. (Chromadorida: Chromadoridae) from the hull of a research vessel, New Zealand." PeerJ 8 (May 26, 2020): e9233. http://dx.doi.org/10.7717/peerj.9233.
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Chromadorina is a globally distributed, largely marine nematode genus frequently found on a variety of organisms, including macro- and microalgae and crustaceans, as well as artificial substrates such as settlement plates and ship hulls. Here, Chromadorina tangaroa sp. nov. is described from filamentous seaweed growing on the hull of RV Tangaroa anchored in Wellington, North Island of New Zealand. It is characterized by body length 763–1,086 μm, and pore of secretory-excretory system located at or near level of teeth. Males have spicules with rounded capitulum followed by a narrower shaft and blade tapered distally, a gubernaculum as long as the spicules, and three cup-shaped precloacal supplements, and females are characterized by a cuticularized prevulvar pad, vagina located at 46–48% of body length from anterior, and vagina anteriorly directed. Chromadorina tangaroa sp. nov. is the first species of the genus to be described from New Zealand, but it is unclear whether it is native to the region because it may have dispersed as part of ship hull biofouling communities. Long-distance transport of nematodes through ship hull biofouling may be a common occurrence, but too little is known about the occurrence of nematodes on ship hulls to gauge the potential effect of shipping on nematode species distributions.
6
Stern, F., Y. Toda, and H. T. Kim. "Computation of Viscous Flow Around Propeller-Body Configurations: Iowa Axisymmetric Body." Journal of Ship Research 35, no. 02 (1991): 151–61. http://dx.doi.org/10.5957/jsr.1991.35.2.151.
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Further validation of a viscous-flow method for predicting propeller-hull interaction is provided through detailed comparisons with recent experimental data for the practical configuration of the Iowa axisymmetric body. Modifications are made to the k-ε turbulence model and wall functions for axisymmetric bodies. Close agreement is demonstrated between the calculations and the data, which supports the conclusion that the present procedures can accurately simulate the steady part of the combined propeller-hull flow field. However, the present extensive comparisons also point out the critical role of turbulence modeling and detailed numerical treatments. Also, comparisons are made with Huang's inviscid-flow method. Although both methods show similar trends, there are some important differences; for example, Huang's method predicts reduced propeller loading and larger axial velocities in the propeller plane near the body surface and propeller tip. Near the propeller tip, the present method exhibits a velocity defect region, which is absent in Huang's method. In consideration of the greater rigor of the present method, such differences imply that viscous effects play an important role in propeller-hull interaction even for the relatively simple case of an axisymmetric body and should be accounted for in the design procedures of wake-adapated propellers. However, part of the differences may be due to some of the present detailed numerical treatments, which indicate the need for continued refinement of comprehensive methods, such as the present one, and more detailed experimental information for validation purposes.
7
Matveev, Konstantin I., and Jeffrey M. Collins. "Numerical Investigation of High-Reynolds-Number Air-Ventilated Water Flow under Solid Body with Surface Geometry Variations." Fluids 6, no. 5 (2021): 174. http://dx.doi.org/10.3390/fluids6050174.
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Air-ventilated cavities formed under or around the hulls of marine vehicles can reduce water drag. Hull configurations with partial air ventilation where air cavities reattach to body surfaces are of special practical interest, since the required air supply rates to achieve significant drag reduction can be made rather low. However, formation and stability of such air cavities are sensitive to the hull geometry and operational conditions. In this study, an attempt is made to numerically simulate one setup with a partial air cavity that was previously tested experimentally at high Reynolds numbers, above 50 million. A computational fluid dynamics software Star-CCM+ has been employed for numerical modeling. Stable and unstable states of the air-cavity setup, characterized by long and collapsing air cavities, respectively, were modeled at two air supply rates near the stability boundary. Numerical results were similar to experimental data at the optimal water speed for the tested geometry, when a long air cavity was sustained at a minimal air supply rate. For water speeds that were substantially higher or lower than the optimal case, a stable cavity could not be maintained with small air supply rates for the given hull geometry. Numerical simulations demonstrated how alterations of the body surface could help sustain long air cavities across a broader speed range using air supply rates that were similar to the optimal case. These findings suggest that morphing hull surfaces can potentially be used for control of drag-reducing air cavities and expand the viable operating range for their application to marine vehicles.
8
Kahramanoğlu, Emre, Ferdi Çakıcı, and Ali Doğrul. "Numerical Prediction of the Vertical Responses of Planing Hulls in Regular Head Waves." Journal of Marine Science and Engineering 8, no. 6 (2020): 455. http://dx.doi.org/10.3390/jmse8060455.
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The evaluation of the hydrodynamic performance of planing vessels has always been one of the most attractive study fields in the maritime agenda. Resistance and self-propulsion studies have been performed using experimental and numerical methods by researchers for a long time. As opposed to this, the seakeeping performance of planing hulls is assessed with 2D approximation methods, but limitedly, while the experimental campaign is not cost-effective for several reasons. With this motivation, pitch and heave transfer functions and accelerations were obtained for a monohedral hull and a warped hull using a state of art commercial Reynolds-averaged Navier–Stokes (RANS) solver, in this study. Moreover, 2-DOF (degree of freedom) dynamic fluid–body interaction (DFBI) equations were solved in a coupled manner with an overset mesh algorithm, to find the instantaneous motion of the body. After verification, obtained numerical results at three different Froude numbers and a sufficiently large wave frequency range were compared with the experiments. The results showed that the employed RANS method offers a very accurate prediction of vertical motions and accelerations for planing hulls.
9
Gavan, Eugen, Violeta Mihaela Hogas, Florin Renardo Teodor, and Costel Iulian Mocanu. "Comparative study of the cutting shape from the reinforced elements on the ship body structure." Analele Universităţii "Dunărea de Jos" din Galaţi. Fascicula XI, Construcţii navale/ Annals of "Dunărea de Jos" of Galati, Fascicle XI, Shipbuilding 43 (December 15, 2020): 45–52. http://dx.doi.org/10.35219/annugalshipbuilding.2020.43.06.
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"In order to achieve a lighter ship hull, solutions are required regarding the mass reduction of the structural elements, which are part of the ship hull. In the development of the ship hull, besides the shell, there is another series of system elements, the transverse and longitudinal frames, which ensure the rigidity, the strength and the stability of the ship. Depending on the building system of the ship hull, these structural elements have a more or less preponderance in the total mass of the ship. In this study paper using Finite Elements Method will be presented a comparative study of different cutting forms through the reinforced frame elements, which are a part of the structure of the ship hull. On the end will be some conclusions regarding the opportunity of adopting one form or the other."
10
van der Ploeg, Auke. "A Comparison of Several Strategies to Optimize a Ship’s Aft Body." Journal of Ship Production and Design 27, no. 04 (2011): 202–11. http://dx.doi.org/10.5957/jspd.2011.27.4.202.
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This paper describes a procedure to optimize ship hull forms, based on double body viscous flow computations with PARNASSOS. A flexible and effective definition of parametric hull form variations is used, based on interpolation between basis hull forms. One of the object functions is an estimate of the required power. In this paper we will focus on how to improve this estimate, by using the B-series of propellers. Results of systematic variations applied to the VIRTUE tanker together with scale effects in the computed trends will be discussed. In addition, we will demonstrate how the techniques discussed in this paper can be used to design a model that has a wake field that strongly resembles the wake of a given containership ship at full scale.