Relevant bibliographies by topics / Trajectory of projectiles

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

Academic literature on the topic 'Trajectory of projectiles'

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

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Journal articles on the topic "Trajectory of projectiles"

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Kim, Jonghoek. "Autonomous Balloon Controls for Protection against Projectiles with Known Destinations." Applied Sciences 11, no. 9 (April 29, 2021): 4077. http://dx.doi.org/10.3390/app11094077.

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This article tackles autonomous balloon controls for protection against projectiles with known destinations. We introduce a defense strategy against an enemy projectile trying to reach a destination, such as a military base, which is known a priori. We further assume that the position of the platform that launches the projectile is known in advance. Because both the platform and the projectile’s destination are known in advance, we can predict the trajectory of the projectile before the projectile is launched. The proposed defense strategy is to deploy multiple balloons on the projectile’s feasible paths so that they block the incoming projectile effectively. Each balloon has GPS sensors for locating itself and IR sensors to detect an incoming projectile. Once the projectile is sufficiently close to a balloon, the balloon explodes to destroy the projectile. Since the projectile’s purpose is reaching its destination, the balloons can effectively intercept the projectile using this blocking strategy. As far as we know, this article is novel in utilizing multiple balloons for protection against an enemy projectile. The effectiveness of our defense strategy is further verified utilizing MATLAB simulations.
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JO, JONG-HYUN, and YOUNG-SHIN LEE. "A STUDY OF RICOCHET PHENOMENON FOR INCLINED IMPACT OF PROJECTILE." International Journal of Modern Physics: Conference Series 06 (January 2012): 443–48. http://dx.doi.org/10.1142/s2010194512003583.

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In this study, the numerical simulation using AUTODYN-3D program was investigated for trajectory prediction for inclined impacts of projectiles. The penetration and perforation of polycarbonate( PC ) plate by 7.62 mm projectile was investigated numerically. The characteristic structure of the projectile's trajectory in the PC plates was studied. Two combined failure criteria were used in the target plate, and the target plate was modeled with the properties of polycarbonate for simulating the ricochet phenomenon. The numerical analyses were used to study the effect of the angle of inclination on the trajectory and kinetic energy of the projectile. The dynamic deformation behaviors tests of PC were compared with numerical simulation results which can be used for predictive purpose. Ricochet phenomenon for angles of inclination of 0° ≤ θ ≤ 20° in the analysis. The projectile perforated the plate for θ > 30°, thus defined a failure envelope for numerical configuration. The numerical analyses was used to study the effect under the projectile impact velocity on the depth of penetration(DOP).
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DZIOPA, Zbigniew, and Krzysztof ZDEB. "Effect of the Man-Weapon System on the Trajectory of a Projectile Fired from a Machine Pistol." Problems of Mechatronics Armament Aviation Safety Engineering 8, no. 1 (March 31, 2017): 101–14. http://dx.doi.org/10.5604/01.3001.0009.8997.

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The process of burst-firing two projectiles from a Skorpion vz. 61 7.65 mm calibre machine pistol was recorded during a test at a firing range operated by the Polish Police. This experimental test involved Browning 7.65 x 17 mm SR ammunition rounds. The shots were fired by a Police Special Forces operative. The shots were recorded with a Phantom v.9.1 slow-motion video camera, complete with the essential accessories. TEMA, a software suite dedicated to video recording analyses, was used to determine the initial kinematic parameters of flight for each of the two projectiles. By applying the theorem of momentum and spin change, a theoretical projectile flight model was developed with a respective simulation runtime in SciLab. The projectile flight results were verified with the experimental test results to validate the developed model. Having delivered a reliable projectile flight model, an analysis was carried out to study the effectiveness of the shots fired by the Police Special Forces operative towards a target 30 metres away. This paper presents a determined process of burst firing of two projectiles. It is also a representative example of repetitive shooting. The ultimate task of this research is to develop guidelines for the design of machine pistol dynamic properties that reduce the scatter of projectiles shot in series.
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Salimipour, Seyed Erfan, Ali Reza Teymourtash, and Mojtaba Mamourian. "Investigation and comparison of performance of some air gun projectiles with nose shape modifications." Proceedings of the Institution of Mechanical Engineers, Part P: Journal of Sports Engineering and Technology 233, no. 1 (March 4, 2018): 3–15. http://dx.doi.org/10.1177/1754337118759159.

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Shooting accuracy of air gun projectiles is very important in sport tournaments and has always been questioned by enthusiasts. For this purpose, the performance of four samples of air gun projectiles (pellets) with various shapes and calibers of 4.5, 5.5 and 6.35 mm was studied in this article. The projectiles were four basic shapes: flat nose, sharp nose, round nose and spherical. After these projectiles were modeled geometrically, the three-dimensional compressible turbulent Navier–Stokes equations and dynamic equations of the projectiles’ motion were solved in a coupled form and in a moving computational grid. The computed results describe the trajectory, velocity variations and the altitude loss of the projectiles with time and location. Comparisons indicate that the round nose projectile had the best performance at long distances compared to the other samples. The flat nose projectile exhibited great performance at short distances, but behaved weakly at long distances. In addition, the effect of nose shape on the performance of the sharp and round nose projectiles was studied and the optimum nose shapes were identified.
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Laube, Gerhard. "Trajectory Modeling for Base Bleed Projectiles." International Journal of Energetic Materials and Chemical Propulsion 1, no. 1-6 (1988): 205–13. http://dx.doi.org/10.1615/intjenergeticmaterialschemprop.v1.i1-6.150.

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Gao, Jianguo, Zhihua Chen, Wei-Tao Wu, and Xin Li. "Numerical Investigations on the Water Entry of Cylindrical Projectiles with Different Initial Conditions." Applied Sciences 9, no. 9 (May 6, 2019): 1858. http://dx.doi.org/10.3390/app9091858.

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In this paper, coupled with Reynolds-averaged Navier–Stokes equations and ballistic equations, the numerical simulations of high-speed water entry of projectiles under different conditions have been conducted. The water-gas flow was modeled by the mixture multiphase model. The numerical results indicated that the simulations agree well with analytical solutions by two cavity models, which validates the model applied. Then the effects of variations of project length, entry angle and velocity on the entry process of projectiles were further investigated. The results show that, for small water entry angles, the cavity wall interacts with the projectile, affects the trajectory of the projectile, and even ricochets for projectiles with small length (5D). On the other hand, the projectile vibrates during the whole process of water entry; the vibration amplitude decreases with the increase of projectile length and entry angle; however, it is the contrary for the vibration period. Furthermore, after the initial impact period, the influence of these parameters on the drag coefficient is not obvious.
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Tian, Zai Ke, Suo Chang Yang, De Long Feng, and Yun Zhi Yao. "Modeling and Simulation of Impact Point Prediction Algorithm." Applied Mechanics and Materials 347-350 (August 2013): 438–42. http://dx.doi.org/10.4028/www.scientific.net/amm.347-350.438.

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Trajectory correction projectiles significantly improved shooting accuracy of conventional ammunition.This paper designed an impact point prediction algorithm based on perturbation theory, and proposed trajectory correction scheme based on the impact point prediction algorithm. Based on perturbation theory, getting samples by solving ideal trajectory and typical disturbed trajectory, and solving the coefficients of the prediction model by regression.The 6-degrees of freedom trajectory simulation shows that adopting this correction guidance law, the standard error of the longitudinal falling points of projectiles reduced significantly.
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Zhang, Yongwei, Min Gao, Suochang Yang, and Dan Fang. "Optimization of Trajectory Correction Scheme for Guided Mortar Projectiles." International Journal of Aerospace Engineering 2015 (2015): 1–14. http://dx.doi.org/10.1155/2015/618458.

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Guidance with traditional trajectory correction scheme usually starts from the trajectory apex time to reduce drag penalties early in flight; however, this method cannot get the max trajectory correction capability of canards according to our analysis. This paper presents an optimized trajectory correction scheme by taking different control phases of canards in ballistic ascending segment and ballistic descending segment. Simulation indicates that the optimized trajectory correction can improve the trajectory correction capability greatly. The result of an example trajectory and Monte Carlo simulations with the predictive guidance law and the trajectory tracking guidance law testifies the effectiveness of the optimized trajectory correction scheme.
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Величко Лев Дмитрович, Горчинський Ігор Володимирович, and Сорокатий Микола Іванович. "ЗОВНІШНЯ БАЛІСТИКА СНАРЯДУ БМ1 ВИПУЩЕНОГО З Т-12 (МТ-12)." World Science 1, no. 1(53) (January 31, 2020): 23–29. http://dx.doi.org/10.31435/rsglobal_ws/31012020/6891.

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The magnitudes of the kinematic parameters of projectiles motion in the air depends on deterministic (form of projectile, its mass, temperature of air and charge, atmospheric pressure, derivation) and nondeterministic (muzzle velocity, magnitude and direction of wind velocity) values. During the projectile movement, its weight and frontal air resistance force have a determining influence on its dynamics. In the article it is investigated proposed by authors the mathematical model of determination of the functional dependence of the magnitude of the frontal air resistance force of the projectile’s motion on its velocity, mass and caliber, geometric characteristics, temperature and density of air, atmospheric pressure, sound speed in air. Since the trajectory of movement of the BM1 projectile released from the T-12 (MT-12) is canopy, it is assumed that during the projectile’s flight the air temperature and atmospheric pressure are unchanged and equal to their value at the point of the gun.
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Vaughn, Harold R., Walter P. Wolfe, and William L. Oberkampf. "Flight trajectory simulation of fluid payload projectiles." Journal of Guidance, Control, and Dynamics 9, no. 2 (March 1986): 213–20. http://dx.doi.org/10.2514/3.20092.

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Dissertations / Theses on the topic "Trajectory of projectiles"

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Libsig, Michel. "Contrôle d'écoulements en vue d'un pilotage alternatif pour les projectiles d'artillerie." Thesis, Besançon, 2016. http://www.theses.fr/2016BESA2022/document.

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Afin d'atteindre leur cible, les projectiles guidés d'artillerie nécessitent d'être dotés d'un dispositif de pilotage. Des surfaces de contrôle déployables et orientables sont donc nécessaires. Toutefois, le montage de gouvernes ajustables sur une ogive est une tâche mécaniquement ardue. En effet, lors du tir effectué par canon, l'équipement de bord subit une accélération significative, ce qui implique que des liaisons mécaniques particulièrement robustes doivent être conçues entre les ailettes et le corps. Cette technologie est bien maîtrisée lorsqu'elle est employée sur des projectiles de gros calibre, mais devient bien plus compliquée quand elle doit être adaptée pour être intégrée dans des petits ou moyens calibres. Néanmoins, dans des conditions de vol supersonique, des ondes de choc qui interagissent avec des surfaces solides sont susceptibles de considérablement modifier la distribution de pression. Ce principe a permis d'imaginer une méthode alternative de pilotage de projectiles supersoniques en exploitant des ondes de choc générées au moyen de petites perturbations créées à partir d'un micro-actionneur de forme cylindrique, aussi appelé micro-plot. Comme les forces de portance exercée sur un corps sont essentiellement dues à une pression appliquée sur de grandes surfaces, il a été choisi de se baser sur une configuration stabilisée par empennage. En vue de simplifier l'étude, le travail a été effectué sur un projectile académique de référence bien connu appelé le Basic Finner.Des expériences ont tout d'abord été effectuées dans la soufflerie supersonique de l'ISL sur une plaque plane comportant un plot et deux ailettes verticales. Ces mesures ont permis de valider la capacité de simulations numériques stationnaires RANS à prédire à la fois la distribution pariétale de la pression que génère un tel actionneur et le champ de vitesse de l'écoulement dans son voisinage. Les distributions de pression et de vitesse ont été mesurées en utilisant des méthodes optiques appelés Pressure Sensitive Paints (PSP) et Particle Image Velocimetry (PIV) afin d'être comparés avec les résultats de la CFD. Une étude paramétrique a ensuite été menée en se basant exclusivement sur ces simulations RANS. Ces calculs ont permis de déterminer l'emplacement optimal pour lequel le plot est le plus efficace sur toute l'enveloppe de vol du projectile. A partir de cette position optimale, deux configurations spécifiques ne générant aucun moment de roulis ont été étudiées numériquement et comparés en termes d'efficacité. En utilisant les coefficients aérodynamiques résultants de ce travail, des simulations de trajectoires à 6 degrés de liberté (6-DOF) ont été réalisées avec le code de BALCO (OTAN). Celles-ci ont permis de déterminer la déviation potentielle qui peut être obtenue sur une des deux configurations retenues en employant un tel micro-actionneur. Ces simulations 6-DOF ainsi que l'effet de du plot sur le projectile ont enfin été validés lors d'une campagne d'essai en vol libre qui a eu lieu sur le champ de tir de l'ISL
In order to reach their target, guided artillery projectiles need some steering capability. Folding and adjustable control surfaces are thus necessary. However, mounting adjustable rudders on a shell is a difficult task, mechanically speaking. Indeed, during the gun launch, the onboard equipment undergoes significant acceleration so that robust mechanical joints have to be designed between the rudders and the body. This technique performs very well on large-caliber projectiles, but becomes more complicated when it has to be embedded in small- or medium-caliber ones. Nevertheless, under supersonic flight conditions, shock waves interacting with solid surfaces are likely to strongly modify the pressure distribution. This principle made it possible to imagine a way of steering small-caliber vehicles using shock waves generated by means of small disturbances created by a cylindrical-shaped micro-actuator, also called micro-pin. As lift forces exerted on a body are mainly due to the pressure applied to large surfaces, a finned configuration has been chosen. To simplify the study, the work has been conducted on the Basic Finner, a well known academic reference projectile.Experiments were first performed in the ISL supersonic wind tunnel on a flat plate on which a pin and two vertical projectile-like fins were mounted in order to validate the capability of steady RANS numerical simulations to predict both the pressure footprint of such an actuator and the flow velocity in its vicinity. Pressure and velocity distributions have been measured by using optical methods called Pressure-Sensitive Paint (PSP) and Particle Image Velocimetry (PIV) in order to be compared with the calculation results. A parametric study was then conducted with these RANS simulations so that the optimum location for which the pin is the most effective over the complete flight envelope of the projectile could be determined. Using this optimum position two specific no-roll momentum configurations were studied numerically and compared in terms of effectiveness. By using the aerodynamic coefficients resulting from this work, 6-Degree-Of-Freedom (6-DOF) trajectory simulations were performed with the NATO BALCO code on one of these configurations in order to determine the potential deviation which can be obtained with such an actuator. These 6-DOF simulations as well as the pin effect on the projectile could finally be validated during a free-flight campaign that took place at the ISL open-range testing site
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Menegat, Alessandro. "Um estudo sobre as trajetórias dos projéteis nas obras de Niccolò Tartaglia." Pontifícia Universidade Católica de São Paulo, 2015. https://tede2.pucsp.br/handle/handle/13303.

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Made available in DSpace on 2016-04-28T14:16:21Z (GMT). No. of bitstreams: 1 Alessandro Menegat.pdf: 795829 bytes, checksum: 94bc3d43f28b9c27945251528cbeb43c (MD5) Previous issue date: 2015-03-17
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This work aims to address some aspects of Niccolò Tartaglia's (1500-1556) different arguments on the trajectories of projectiles. On one hand, at Nova Scientia (1537), the author explained that the trajectories were composed by two straight lines and a circular arc; on the other, at Quesiti et Inventioni Diverse (1546), the same trajectories were presented only as curves. These two different approaches to the trajectory of projectiles suggested to some historians that Tartaglia had changed his mind, leaving, in a way, his old beliefs. Thus, based on original documents, this paper seeks to resume Tartaglia arguments in order to understand the reasons which would have led him to change his approaches in those two works. Despite other factors, we present evidence that Tartaglia had, around 1540, come in contact with works that had almost none circulation before. With this in mind, our work provides evidence that there is some continuity between the arguments of Tartaglia on the trajectories in these two works
Este trabalho tem por objetivo tratar alguns aspectos das diferentes argumentações de Niccolò Tartaglia (1500-1556) sobre as trajetórias dos projéteis. Na Nova Scientia (1537), as trajetórias seriam compostas por duas retas e um arco de circunferência. Já nos Quesiti et Inventioni Diverse (1546), elas são apresentadas completamente curvas. Esses dois enfoques diferentes dados ao tema sugeriram a alguns historiadores que Tartaglia teria mudado de ideia, abandonando, de certa maneira, suas antigas convicções. Desse modo, baseado em documentos originais, este trabalho busca retomar os argumentos de Tartaglia de modo a compreendermos as razões que o teriam levado a dar dois diferentes enfoques nas duas obras. Dentre outros fatores, apresentamos indícios de que Tartaglia passou a contar, por volta de 1540, com obras anteriormente desconhecidas e que pouco circulavam até então. Tendo isso em vista, nosso trabalho fornece indícios de que podemos observar certa continuidade entre as argumentações de Tartaglia sobre as trajetórias nessas duas obras
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Holley, Bruce John. "Method of masses to determine a projectile's aerodynamic coefficients and performance." Thesis, Loughborough University, 1998. https://dspace.lboro.ac.uk/2134/32800.

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The thesis traces the history of missile aerodynamic prediction methods and defines the aerodynamic requirements for the subsonic free-flight projectiles configurations under consideration. Different types of trajectory model are described with the aerodynamic input requirement being analysed. Methods of generating the required aerodynamic data for the trajectory models are discussed emphasising the aerodynamic models capabilities, weaknesses and ease of use. The method of masses aerodynamic prediction method is defined, highlighting the adaptations to the method that were carried out to generate the aerodynamic stability data required for subsequent projectile trajectory analysis. An assessment of the sensitivity and accuracy of the simulated data is carried out using experimental flight trial data on different projectile configurations. Finally, using the simulation models developed in previous chapters, a parametric analysis is carried out on different projectile configurations to optimise the trajectory performance.
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Arnoult, Guillaume. "Modélisation de la trajectoire d'un projectile gyrostabilisé muni d'un dispositif de contrôle." Thesis, université Paris-Saclay, 2020. http://www.theses.fr/2020UPAST068.

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L’intensification des combats en milieu urbains pousse les industriels de l’armement terrestre à développer des systèmes d’armes intégrant des dispositifs de correction de trajectoire. Le déploiement de tels dispositifs au cours du vol d’un projectile d’artillerie doit permettre de réduire l’erreur de dispersion afin de limiter au maximum les risques de dommages collatéraux. L’enjeu réside ici dans le développement d’un dispositif adapté aux conditions de vol d’un projectile gyrostabilisé. Un spoiler isolé, supposé monté sur une bague libre en rotation, est identifié comme le moyen de contrôle le plus adapté. L’objet de ces travaux consiste à développer un algorithme d’optimisation des caractéristiques géométriques d’un tel dispositif et de démontrer qu’il possède l’autorité suffisante pour générer une modification de la portée ainsi que de la déviation latérale du projectile. D’une part un réseau de neurones modélise les variations des coefficients aérodynamiques du spoiler à partir de résultats de simulations RANS. D’autre part, la modélisation par kriging des fonctions objectifs et contraintes tire avantage de l’estimation de l’erreur de modélisation. Ceci permet de définir des critères d’enrichissement assurant un compromis entre exploration et exploitation du domaine défini par l’ensemble des paramètres géométriques. L’application de l’algorithme d’optimisation au dimensionnement du spoiler a permis d’identifier une configuration géométrique optimale satisfaisant les objectifs de l’étude en termes de correction de trajectoire. Des simulations ZDES sur cette configuration particulière ont été réalisées dans le but de constituer un niveau de fidélité supérieur aux évaluations RANS des coefficients aérodynamiques. Elles donnent également lieu à une caractérisation physique des modifications de l’écoulement de culot engendrées par la présence du spoiler. Une campagne d’essais en soufflerie permet de valider la démarche méthodologique développée dans ces travaux et ouvre des perspectives pour de futurs travaux concernant l’inclusion de données expérimentales dans une base de données numérique dans le cadre de méta-modèles multi-niveaux de fidélité
The intensification of urban combat encourages the industrials of terrestrial armament to develop new weapon systems equipped with trajectory modification devices. Deploying these devices during the projectile flight would allow reducing the scattering error in order to narrow the collateral damage. The challenge lies in the development of a device adapted to the flight conditions of a spin-stabilized projectile. An isolated spoiler, installed on a rotatable ring, is chosen as the most adapted control device. This work consists in developing an optimization algorithm for the geometrical parameters of the spoiler and to demonstrate that it is possible to modify concurrently the range and lateral deviation of the projectile. On one hand a neural network model the variations of the aerodynamic coefficients from RANS calculations. On the other hand, the kriging modeling of the objective and constraint functions benefits from the estimation of the modeling error. This allows defining enrichment criteria ensuring a tradeoff between exploration and exploitation of the geometrical domain. The optimization of the spoiler geometrical parameters leads to the identification of an optimal configuration able to achieve the course corrections abilities targeted. ZDES simulations on this particular configuration have been achieved to form a new fidelity level in addition to the RANS evaluations of the aerodynamic coefficients. These simulations lead to a physical characterization of modifications of the boat-tail flow induced by the presence of the spoiler. A wind tunnel campaign provides a validation step to the optimization methodology developed and offers promising perspectives for future work in terms of experimental data inclusion in a numerical database through multi-level surrogate modeling
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Chen, Shufei. "Markerless Lung Tumor Trajectory Estimation from Rotating Cone Beam Computed Tomography Projections." VCU Scholars Compass, 2016. http://scholarscompass.vcu.edu/etd/4439.

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Respiration introduces large tumor motion in the thoracic region which influences treatment outcome for lung cancer patients. Tumor motion management techniques require characterization of temporal tumor motions because tumor motion varies patient to patient, day to day and cycle to cycle. This work develops a markerless algorithm to estimate 3 dimensional (3D) lung-tumor trajectories on free breathing cone beam computed tomography (CBCT) projections, which are 2 dimensional (2D) sequential images rotating about an axis and are used to reconstruct 3D CBCT images. A gold standard tumor trajectory is required to guide the algorithm development and estimate the tumor detection accuracy for markerless tracking algorithms. However, a sufficient strategy to validate markerless tracking algorithms is lacking. A validation framework is developed based on fiducial markers. Markers are segmented and marker trajectories are xiv obtained. The displacement of the tumor to the marker is calculated and added to the segmented marker trajectory to generate reference tumor trajectory. Markerless tumor trajectory estimation (MLTM) algorithm is developed and improved to acquire tumor trajectory with clinical acceptable accuracy for locally advanced lung tumors. The development is separate into two parts. The first part considers none tumor deformation. It investigates shape and appearance of the template, moreover, a constraint method is introduced to narrow down the template matching searching region for more precise matching results. The second part is to accommodate tumor deformation near the end of the treatment. The accuracy of MLTM is calculated and compared against 4D CBCT, which is the current standard of care. In summary, a validation framework based on fiducial markers is successfully built. MLTM is successfully developed with or without the consideration of tumor deformation with promising accuracy. MLTM outperforms 4D CBCT in temporal tumor trajectory estimation.
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Lewis, John Henry. "Lung tumor tracking, trajectory reconstruction, and motion artifact removal using rotational cone-beam projections." Diss., [La Jolla] : University of California, San Diego, 2010. http://wwwlib.umi.com/cr/ucsd/fullcit?p3407863.

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Thesis (Ph. D.)--University of California, San Diego, 2010.
Title from first page of PDF file (viewed June 23, 2010). Available via ProQuest Digital Dissertations. Vita. Includes bibliographical references (leaves 129-150).
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Kebbiche, Zakia. "Étude et extensions d'algorithmes de points intérieurs pour la programmation non linéaire." Le Havre, 2007. http://www.theses.fr/2007LEHA0014.

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Dans cette thèse, nous présentons une étude algorithmique et numérique concernant la méthode de trajectoire centrale appliquée au problème de complémentarité linéaire considéré comme une formulation unificatrice de la programmation linéaire et de la programmation quadratique convexe. Puis, nous proposons deux variantes intéressantes, l'une de trajectoire centrale et l'autre de type projectif avec linéarisation, pour minimiser une fonction convexe différentiable sur un polyèdre. Les algorithmes sont bien définis et les résultats théoriques correspondants sont établis
In this thesis, we present an algorithmically and numerical study concerning the central path method for linear complementarity problem wich is considered as an unifying framework of linear and quadratic programming. Then, we propose two intersting variants namely the central path and the projective with linearization methods for minimizing a convex differentiable function on a polyhedral set. The algorithms are well defined and the corresponding theoretical results are established
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Fang, Dandan. "Diagnostic et adaptation des trajectoires robotiques en projection thermique." Phd thesis, Université de Technologie de Belfort-Montbeliard, 2010. http://tel.archives-ouvertes.fr/tel-00598778.

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Robots manipulateurs sont couramment utilisés pour la projection thermique, qui peuvent être programmés de deux façons : par apprentissage et par la programmation hors-ligne. La programmation par apprentissage ne peut pas garantir la qualité de revêtements, en particulier pour les pièces de forme complexe. La technologie de la programmation hors-ligne est une bonne solution, en utilisant le fichier CAO de la pièce à revêtir. Le but de cette étude est de développer une trousse à outil - Thermal Spray Toolkit (TST) sous RobotStudio™ 5 (ABB), un logiciel de programmation hors-ligne, pour générer la trajectoire adaptée à l'application de projection thermique en fonction de la forme de la pièce et des paramètres cinématiques tels que la distance de projection, l'orientation normal à la surface, le débordement, le pas de balayage etc. Cela résout les difficultés de génération de la trajectoire adaptée à la projection thermique sur la pièce complexe sous RobotStudio™. En outre, deux méthodes d'amélioration de la trajectoire sont proposées pour maintenir la vitesse du CDO après les analyses. Les simulations et les essais ont prouvé que ces deux méthodes peuvent améliorer efficacement la stabilité de la vitesse du CDO ainsi que la qualité du revêtement. A la fin, l'axe externe rotatif a été appliqué en projection thermique et la programmation d'axe externe automatique a été intégrée également dans le TST. Les trajectoires verticale et horizontale ont été générées et analysées sur une pièce qui nécessite de l'utilisation d'un axe externe. Les simulations et les essais ont été réalisés pour ces différents programmes, ils ont montré que la trajectoire verticale a donné de meilleurs résultats que la trajectoire horizontale.
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YANG, TSAI-HUNG, and 蔡鴻揚. "Numerical Study on the Dynamic Trajectory of Projectiles." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/36089254573097348920.

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碩士
逢甲大學
航太與系統工程所
98
The movement of projectile in airflow field frequently occurs in our daily life. The scale of this phenomenon may be as small as the tiny particles moving in airflow and as big as the projectiles of any shape moving in the flow field. In this research, computational fluid dynamics software Fluent 6.3.26 is employed. In accordance with different rotational speed, initial velocity and direction of rotation, the dynamic trajectory of projectile in airflow were predicted. In this study, dynamic mesh technique and κ-ε turbulence model provided by Fluent were used in the simulation of interactions between projectiles and the surrounding airflow. According to the transient displacement of the projectile subjected to forces, variation of pressure in surrounding airflow, recirculation phenomena and dynamic trajectory of projectiles were analyzed. It was found that the pressure difference between the upper and lower surfaces of projectiles with different rotation speed affects their descent distances. With increasing of rotation speed, shorter distance is descended. The flight paths of projectiles investigated are parabolic trajectories.
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Rocha, Hugo Filipe Leça Pereira da. "Trajectory and aerodynamic analyses of air launched fire-extinguishing projectiles." Master's thesis, 2020. http://hdl.handle.net/10400.6/10586.

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Wildfires are a devastating source of human and environmental loss, and the available means to combat them in their early stages can be improved. With the aid of Unmanned Aerial Systems and FEB (Fire-extinguishing balls), wildfires’ early stages might be suppressed while keeping human lives safe and firefighters risk-free. Considering the use of a fixed wing Unmanned Aircraft Vehicle to launch the fire-extinguishing projectile, launching the FEB as it is, without any modification, does not seem to be the best available option, with problems ranging from difficulty in predicting its trajectory to the possible bad impact performance, with the possibility of the FEB rolling away from the target as it lands. Therefore, three other configurations for the projectile with FEB as its basis were studied, all of them utilizing fins for the means of stability. These configurations differed in terms of tail design attached to the FEB: one is a tube, the other a tangential cone, and the other a symmetrical NACA airfoil revolved around its axis. Their aerodynamic static coefficients were obtained through CFD (computational fluid dynamics), while the dynamic ones were obtained through analytical expressions. Using an implemented 6-DOF (degrees of freedom) model, 17 trajectories were studied for each of these configurations. Other analyses were carried out, as the consideration of the influence of wind turbulence, consideration of a fourth configuration with double the area of the fins, and asserting the importance of the consideration of the dynamic coefficients while testing different values for some of these coefficients. Regarding the FEB-projectile configurations, CFD results suggest that the tube configuration has a transient behavior in the tested speeds, and that the tangential cone is a very suitable way of streamlining the FEB in these range of speeds, with no considerable difference to the NACA tail configuration. Trajectory results highlight the importance of considering the mean wind speed and direction, the importance of obtaining an appropriate estimate of the wind turbulence, and the importance of the dynamic coefficients for the full aerodynamic characterization of the projectile, concretely for its stability and attitude results. Ultimately, between the tested configurations, the best candidate is the cone tail configuration, for its simplicity in construction and performance in the trajectories.
Os incêndios florestais são uma fonte devastadora de custos humanos e ambientais, e os meios disponíveis para combater as suas fases iniciais poderão ser melhoradas. Com o auxílio de sistemas de aeronaves não-tripuladas e de FEB (bolas extintoras), os incêndios florestais poderão ser extintos nas suas fases iniciais, mantendo vidas humanas livres de risco. Considerando o uso de uma aeronave não tripulada de asa fixa para lançar o projétilextintor, lançar a bola extintora tal como é não aparenta ser a melhor opção, sendo alguns dos problemas relacionados com o seu lançamento a dificuldade em prever a sua trajetória e um possível mau desempenho no impacto, com a possibilidade da bola rolar para longe do seu alvo. Assim, três configurações para o projétil extintor que tem a FEB como base foram estudados, todos eles utilizando empenagens como forma de estabilização. As configurações diferem em termos da cauda acoplada à FEB: uma delas é um tubo, outra um cone tangencial, e outra um perfil NACA simétrico girado em torno do seu eixo. Os coeficientes aerodinâmicos estáticos foram obtidos através de CFD (dinâmica de fluidos computacional), enquanto que os dinâmicos foram obtidos por expressões analíticas. Implementando um modelo de trajetória 6-DOF (6 graus de liberdade) 17 trajetórias foram estudadas para cada uma das configurações. Outras análises foram realizadas, como a relevância na trajetória da turbulência do vento, a consideração de uma quarta configuração com o dobro da área das empenagens, e a determinação da importância dos coeficientes dinâmicos, testando vários valores para alguns dos coeficientes. Em relação às configurações do projétil testadas, os resultados CFD sugerem que a configuração com o tubo possui um comportamento transiente nas velocidades testadas, e que o cone tangencial é uma forma bastante eficaz de tornar a esfera mais aerodinâmica, nesta gama de velocidades não havendo uma diferença considerável entre esta configuração e a configuração com a cauda NACA. Os resultados das trajetórias destacam a importância da consideração da velocidade e orientação do vento médio, a importância de obter uma estimativa apropriada para a turbulência do vento, e a relevância dos coeficientes dinâmicos para a caracterização aerodinâmica completa do projétil, concretamente em relação à estabilização e atitude. Entre as configurações testadas, o melhor candidato é a configuração com cauda em cone, pela sua simplicidade de construção e desempenho nas trajetórias.
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Books on the topic "Trajectory of projectiles"

1

Tauber, Michael E. Trajectory characteristics and heating of hypervelocity projectiles having large ballistic coefficients. Moffett Field, Calif: Ames Research Center, 1986.

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L, Abbot Henry. Siege artillery in the campaigns against Richmond, with notes on the 15-inch gun: Including an algebraic analysis of the trajectory of a shot in its ricochets upon smooth water : illustrated by accurate drawings of a large collection of the rifle projectiles and fuzes used by each army in Virginia. Arendtsville, Pa. (P.O. Box 52, Arendtsville 17303): D.S. Thomas, 1986.

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United States. National Aeronautics and Space Administration. Scientific and Technical Information Division., ed. Trajectory characteristics and heating of hypervelocity projectiles having large ballistic coeffients. [Washington, DC]: National Aeronautics and Space Administration, Scientific and Technical Information Branch, 1988.

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Wittman, David M. The Equivalence Principle. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780199658633.003.0013.

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The equivalence principle is an important thinking tool to bootstrap our thinking from the inertial coordinate systems of special relativity to the more complex coordinate systems that must be used in the presence of gravity (general relativity). The equivalence principle posits that at a given event gravity accelerates everything equally, so gravity is equivalent to an accelerating coordinate system.This conjecture is well supported by precise experiments, so we explore the consequences in depth: gravity curves the trajectory of light as it does other projectiles; the effects of gravity disappear in a freely falling laboratory; and gravitymakes time runmore slowly in the basement than in the attic—a gravitational form of time dilation. We show how this is observable via gravitational redshift. Subsequent chapters will build on this to show how the spacetime metric varies with location.
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Book chapters on the topic "Trajectory of projectiles"

1

Boccaletti, Dino. "The Motion of Heavy Bodies and the Trajectory of Projectiles." In Galileo and the Equations of Motion, 117–62. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-20134-4_5.

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Fang, Qin, and Hao Wu. "Efficient Decoupled Analytical/Numerical Approach of Terminal Ballistic Trajectory." In Concrete Structures Under Projectile Impact, 211–54. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-3620-0_6.

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Stern, Harry L., Ronald W. Lindsay, Cecilia M. Bitz, and Paul Hezel. "What is the Trajectory of Arctic Sea Ice?" In Arctic Sea Ice Decline: Observations, Projections, Mechanisms, and Implications, 175–85. Washington, D.C.: American Geophysical Union, 2013. http://dx.doi.org/10.1029/180gm12.

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Hou, Li-he, and Hua-jun Liu. "An End-to-End LSTM-MDN Network for Projectile Trajectory Prediction." In Intelligence Science and Big Data Engineering. Big Data and Machine Learning, 114–25. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-36204-1_9.

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Damerow, Peter, Jürgen Renn, and Simone Rieger. "Projectile trajectory and hanging chain-challenging the naive view of scientific discoveries." In Medieval and Classical Traditions and the Renaissance of Physico-Mathematical Sciences in the 16th Century, 115–23. Turnhout: Brepols Publishers, 2001. http://dx.doi.org/10.1484/m.dda-eb.5.113578.

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Liengme, Bernard V. "Projectile trajectory." In Modelling Physics with Microsoft Excel. Morgan & Claypool Publishers, 2014. http://dx.doi.org/10.1088/978-1-627-05419-5ch1.

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Liengme, Bernard V. "Trajectory of a projectile." In SMath for Physics. Morgan & Claypool Publishers, 2014. http://dx.doi.org/10.1088/978-1-6270-5925-1ch3.

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"Trajectory simulation for unguided artillery projectile." In Environment, Energy and Applied Technology, 837–40. CRC Press, 2015. http://dx.doi.org/10.1201/b18135-169.

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Kelley, N. Megan. "Passing as Social Strategy." In Projections of Passing. University Press of Mississippi, 2016. http://dx.doi.org/10.14325/mississippi/9781496806277.003.0003.

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This chapter focuses on representations of racial/ethnic passing in Hollywood films produced in the late 1940s. It examines how postwar filmmakers used their medium to frame passing as a viable social strategy, rather than a sign of an internalized confusion about identity, and to elevate the “social problem” or “message” movies to new levels of prestige and popularity. These films dealt with various themes, including alcoholism, female insanity, racism and racial prejudice, prison reform, death penalty, and anti-Semitism. The chapter analyzes how race and racial identities were constructed in Crossfire and Home of the Brave, not only as a counterpoint to discussions of racial passing in films, but as a way of showing the trajectory of pathological figures in Hollywood films, from twisted psychosis wrought by racial prejudice (late 1940s) to the twisted psychosis wrought by racial passing (late 1950s).
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Hanlon, Robert T. "Galileo and the Law of Fall." In Block by Block: The Historical and Theoretical Foundations of Thermodynamics, 124–37. Oxford University Press, 2020. http://dx.doi.org/10.1093/oso/9780198851547.003.0007.

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Galileo broke away from Aristotle’s incorrect theories of motion towards his own based on experimental evidence. He employed experimentation to discover the parabolic trajectory of projectile motion and also the Law of Fall. His work helped establish the scientific method and launch the scientific revolution.
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Conference papers on the topic "Trajectory of projectiles"

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Charlet, Mark, Élodie Marcellini, and Clément Gosselin. "Trajectory Planning of Projectile Catching Maneuvers for Robotic Manipulators." In ASME 2018 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/detc2018-85395.

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This article introduces a trajectory planning approach for the catching of projectiles with a serial robotic manipulator. A description of the trajectory of the projectiles to be caught is first given. Then, a heuristic approach is introduced in order to determine the interception (catching) point. The planning of the robot trajectory that is required to reach the interception point with the proper velocity is then presented, based on polynomial interpolation. Finally, the trajectory of the robot used to decelerate and stop the projectile is planned. Examples of catching maneuvers are provided in order to illustrate the proposed trajectory planning technique.
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VAUGHN, H., W. WOLFE, and W. OBERKAMPF. "Flight trajectory simulation of fluid payload projectiles." In 12th Atmospheric Flight Mechanics Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1985. http://dx.doi.org/10.2514/6.1985-1824.

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Ryan, Kevin, and Mark Lewis. "Trajectory Optimization Studies of Long Range Morphing Projectiles." In AIAA Atmospheric Flight Mechanics Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2012. http://dx.doi.org/10.2514/6.2012-4862.

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SUBRAHMANYAM, SADERLA, SUNIL SHARMA, and GHOSH A.K. "Analytical Modeling ,Trajectory Simulation and Control of Guided Projectiles." In Annual International Conference on Information Technology and Applications & Annual International Conference on Control, Automation and Robotics. Global Science and Technology Forum, 2011. http://dx.doi.org/10.5176/978-981-08-8113-9_car26.

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Starikovskiy, Andrey, Christopher Limbach, and Richard Miles. "Trajectory control of small rotating projectiles by laser discharges." In 2016 IEEE International Conference on Plasma Science (ICOPS). IEEE, 2016. http://dx.doi.org/10.1109/plasma.2016.7534316.

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Starikovskiy, Andrey, Christopher Limbach, and Richard B. Miles. "Trajectory Control of Small Rotating Projectiles by Laser Sparks." In 54th AIAA Aerospace Sciences Meeting. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2016. http://dx.doi.org/10.2514/6.2016-0459.

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Starikovskiy, Andrey. "Trajectory Control of Small Rotating Projectiles by Laser Discharges." In 47th AIAA Plasmadynamics and Lasers Conference. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2016. http://dx.doi.org/10.2514/6.2016-4308.

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Legner, Hartmut, Edmund Lo, and William Reinecke. "On the trajectory of hypersonic projectiles undergoing geometry changes." In 32nd Aerospace Sciences Meeting and Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1994. http://dx.doi.org/10.2514/6.1994-719.

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LIESKE, ROBERT, and JAMES DANBERG. "Modified point mass trajectory simulation for base-burn projectiles." In Astrodynamics Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1992. http://dx.doi.org/10.2514/6.1992-4641.

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Mou, Yuhan, Jing Zhang, Lingyu Yang, and Xiaoke Feng. "A Fast-Online Guidance Method for Trajectory Correction Projectiles." In 2019 Chinese Control Conference (CCC). IEEE, 2019. http://dx.doi.org/10.23919/chicc.2019.8865246.

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Reports on the topic "Trajectory of projectiles"

1

Cooper, Gene R. Trajectory Prediction of Spin-Stabilized Projectiles With a Steady Liquid Payload. Fort Belvoir, VA: Defense Technical Information Center, November 2011. http://dx.doi.org/10.21236/ada553573.

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Cooper, Gene R. Adding Liquid Payloads Effects to the 6-DOF Trajectory of Spinning Projectiles. Fort Belvoir, VA: Defense Technical Information Center, March 2010. http://dx.doi.org/10.21236/ada519118.

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Cooper, Gene R., and Kevin S. Fansler. Comparison of Meteorological Data With Fitted Values Extracted from Projectile Trajectory. Fort Belvoir, VA: Defense Technical Information Center, October 1994. http://dx.doi.org/10.21236/ada285921.

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Weinacht, Paul. A Direct-Fire Trajectory Model for Supersonic, Transonic, and Subsonic Projectile Flight. Fort Belvoir, VA: Defense Technical Information Center, July 2014. http://dx.doi.org/10.21236/ada607593.

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Segletes, Steven B., and William P. Walters. Analytical Solution in Curvilinear Coordinates for the Trajectory of a Projectile Subject to Aerodynamic Drag. Fort Belvoir, VA: Defense Technical Information Center, December 2011. http://dx.doi.org/10.21236/ada553963.

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