Relevant bibliographies by topics / Conical liners

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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 'Conical liners'

Author: Grafiati
Published: 4 June 2025
Last updated: 6 July 2025

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Journal articles on the topic "Conical liners"

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Alshwawra, Ahmad, Florian Pohlmann-Tasche, Frederik Stelljes, and Friedrich Dinkelacker. "Enhancing the Geometrical Performance Using Initially Conical Cylinder Liner in Internal Combustion Engines—A Numerical Study." Applied Sciences 10, no. 11 (2020): 3705. http://dx.doi.org/10.3390/app10113705.

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Reducing friction is an important aspect to increase the efficiency of internal combustion engines (ICE). The majority of frictional losses in engines are related to both the piston skirt and piston ring–cylinder liner (PRCL) arrangement. We studied the enhancement of the conformation of the PRCL arrangement based on the assumption that a suitable conical liner in its cold state may deform into a liner with nearly straight parallel walls in the fired state due to the impact of mechanical and thermal stresses. Combining the initially conical shape with a noncircular cross section will bring the liner even closer to the perfect cylindrical shape in the fired state. Hence, a significant friction reduction can be expected. For the investigation, the numerical method was first developed to simulate the liner deformation with advanced finite element methods. This was validated with given experimental data of the deformation for a gasoline engine in its fired state. In the next step, initially conically and/or elliptically shaped liners were investigated for their deformation between the cold and fired state. It was found that, for liners being both conical and elliptical in their cold state, a significant increase of straightness, parallelism, and roundness was reached in the fired state. The combined elliptical-conical liner led to a reduced straightness error by more than 50% compared to the cylindrical liner. The parallelism error was reduced by 60% to 70% and the roundness error was reduced between 70% and 80% at different liner positions. These numerical results show interesting potential for the friction reduction in the piston-liner arrangement within internal combustion engines.
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Puente Reyna, Ana Laura, Marcus Jäger, Thilo Floerkemeier, et al. "Backside Wear Analysis of Retrieved Acetabular Liners with a Press-Fit Locking Mechanism in Comparison to Wear Simulation In Vitro." BioMed Research International 2016 (2016): 1–13. http://dx.doi.org/10.1155/2016/8687131.

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Backside wear due to micromotion and poor conformity between the liner and its titanium alloy shell may contribute to the high rates of retroacetabular osteolysis and consequent aseptic loosening. The purpose of our study was to understand the wear process on the backside of polyethylene liners from two acetabular cup systems, whose locking mechanism is based on a press-fit cone in combination with a rough titanium conical inner surface on the fixation area. A direct comparison between in vitro wear simulator tests (equivalent to 3 years of use) and retrieved liners (average 13.1 months in situ) was done in order to evaluate the backside wear characteristics and behavior of these systems. Similar wear scores between in vitro tested and retrieved liners were observed. The results showed that this locking mechanism did not significantly produce wear marks at the backside of the polyethylene liners due to micromotion. In all the analyzed liners, the most common wear modes observed were small scratches at the cranial fixation zone directly below the rough titanium inner surface of the shell. It was concluded that most of the wear marks were produced during the insertion and removal of the liner, rather than during its time in situ.
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Ahmed, Mukhtar, Zheng Xiang Huang, A. Q. Malik, Xu Dong Zu, Qiang Qiang Xiao, and Munir Ahmed. "Penetration Performance of Shaped Charge Jets Using Insensitive Munition: Simulative and Experimental Studies." Advanced Materials Research 1102 (May 2015): 119–23. http://dx.doi.org/10.4028/www.scientific.net/amr.1102.119.

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The simulation and experimental studies of the Jets obtained from different conical liners from a charge having 56mm-diameter is presented in this paper. An OFHC copper liner of thickness 1 mm and 54 mm-diameters is used for jet formation analysis. Charge ignition is made by using Point detonation method. The simulation results are obtained from Ansysis Autodyn 2-D hydrocode. Experiments are conducted for a charge having 600 conical liner. Flash X-ray Radiography is used for image capturing. The performance capacity of standard shaped charge is predicted by its penetration against steel target. It is observed that kinetic energy of the jet decreases as angle increases, also total energy of the explosive increases and hence the Ratio of the K.E of the jet to the total energy of the explosive decreases as the angle increases. Simulation results are compared with the experimental results. It is observed that simulation results are in favorable agreement within acceptable range of error with the experimental results.
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Naeem, K., A. Hussain, and A. Abbas. "A Review of Shaped Charge Variables for its Optimum Performance." Engineering, Technology & Applied Science Research 9, no. 6 (2019): 4917–24. https://doi.org/10.5281/zenodo.3566142.

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Shaped charge is a device for focusing the chemical energy of explosives to a particular point or line for penetration or cutting purpose respectively. They are used for the penetration or cutting of various types of targets on land, water, underground, underwater, or air. Their shape is either conical or linear and consists of explosive, casing and liner. The liner is bent towards the central axis producing a thin hypervelocity jet by the energy released as a result of the explosive detonation. This jet is utilized against the target. Shaped charges can perforate or penetrate targets like aircrafts, ships, submarines, armored vehicles, battle tanks, and bunkers. This paper presents a detailed review of analytical works, computer simulations, and experimental results related to the liner. Among modern diagnostic techniques flash x-rays, radiography is most used in the experiments performed in the last 40 years. Powder metallurgy, which started in the late twentieth century raised the efficiency of shaped charges to new altitudes. The efficiency of the shaped charge depends on numerous factors such as explosive’s type, liner’s material, geometry and metallurgy, manufacturing technique, and casing thickness. Factors concerning the liner’s material, metallurgical advancements, and geometry are discussed chronologically and in detail.
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Hebda, Kamil, Łukasz Habera, and Piotr Koślik. "Modelowanie numeryczne ładunków kumulacyjnych z wkładkami dzielonymi dwuczęściowymi." Nafta-Gaz 77, no. 4 (2021): 264–69. http://dx.doi.org/10.18668/ng.2021.04.06.

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The article was created on the grounds of numerical modelling of shaped charges with a focus on the unconventional shape of their liners. The standard shaped charge of the “deep penetrating” type is equipped with a conical liner made of copper. Three various geometries of shaped charges featuring unconventional shape have been modelled and compared with the classical model of a shaped charge. The shaped charges have been compared for maximum pressure during detonation, cumulative jet velocity, kinetic energy gained and length of cumulative jet after 22 µs. The purpose of modelling shaped charges, featuring unconventionally formed liners, was to check whether they are able to improve the perforation job parameters in oil and gas wells. Perforation of the borehole is a critical job, enabling the initiation of hydrocarbons production from a specific reservoir. The job consists in making series of channels perpendicular to the borehole axis, penetrating casing walls, the cement layer and the formation rock, in order to create a hydraulic link between the borehole and the reservoir of hydrocarbons. In the oil industry, the “deep penetrating” type shaped charges are designed in order to provide optimal length of the perforation channel, while maintaining its adequate perforating diameter. Nowadays, the most commonly deep-penetrating shaped charges used, are the axially-symmetric shaped charges with conical liners made of copper powders. The charges create a cumulative jet reaching a velocity of approx. 7000 m/sec and are able to penetrate up to 1 m of rock matrix in favourable conditions. The article describes the parameters of shaped charges, that have been obtained as a result of numerical modelling. In order to finally confirm the target penetrating ability by the modelled shaped charges, one should check their real physical models in fire-ground conditions.
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Jha, N. K., Deepankar Das, Ashutosh Tripathi, and R. N. Hota. "Acoustic damping: Analytical prediction with experimental validation of mixed porosity liners and analytical investigation of conical liners." Applied Acoustics 150 (July 2019): 179–89. http://dx.doi.org/10.1016/j.apacoust.2019.02.006.

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Schilling, Thomas J. "Reactive-Injecting Follow-Through Shaped Charges from Sequent-Material Conical Liners." Propellants, Explosives, Pyrotechnics 32, no. 4 (2007): 307–13. http://dx.doi.org/10.1002/prep.200700033.

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Khalid, Naeem, Hussain Arshad, and Abbas Shakeel. "A Review of Shaped Charge Variables for its Optimum Performance." Engineering, Technology & Applied Science Research 9, no. 6 (2019): 4917–24. https://doi.org/10.5281/zenodo.3559070.

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Svirsky, O. V., and M. A. Vlasova. "On the Penetration Capability of Shaped Charges with Conical and Hemispherical Liners." Combustion, Explosion, and Shock Waves 55, no. 6 (2019): 739–43. http://dx.doi.org/10.1134/s0010508219060169.

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Cui, Ping, Xinbao Gao, Jingqing Xu, et al. "Simulation and Experimental Study on Jet Velocity of Zr-Based Amorphous Alloy Liner." Metals 12, no. 6 (2022): 978. http://dx.doi.org/10.3390/met12060978.

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Zr-based amorphous alloy is a new energetic material that has been closely monitored and extensively studied for the design of highly effective shaped charge warheads in recent years. In order to accurately determine the motion parameters of shaped charge jets during the detonation-driven formation process of Zr-based amorphous alloy liners, we prepared conical ZrCuNiAlAg liners by vacuum die casting and supercooled liquid high-rheological-rate formation processes. Based on jet-formation numerical simulation, pulsed X-ray imaging and copper foil target velocity measuring tests were conducted to identify the variation trend of the jet velocity of Zr-based amorphous alloy liners with time. The jet velocities at typical moments in the free flight stage were verified. The research results showed that Zr-based amorphous alloy liners could produce solid jets, whose velocity was in gradient descent from the head to the tail, and that the jet’s head velocity peaked at 12 μs and then slowly decreased with time. The average velocities measured by the X-ray imaging and copper foil target tests were 6913 m/s and 7177 m/s, respectively, and both of them were in good agreement with the simulation results, verifying the accuracy of the numerical simulation model for jet formation. The formation processes of shaped charge liners were found to affect the mechanical properties of the material and thus, the jet’s formation process and motion parameters. The Zr-based amorphous alloy liner formed by the supercooled liquid-phase high-rheological-rate formation process exhibited a jet velocity 6.5% higher than that formed by the vacuum die casting process.
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Dissertations / Theses on the topic "Conical liners"

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Tavares, Fabiano Pinto. "Deformações de cônicas e quádricas por operadores lineares." [s.n.], 2008. http://repositorio.unicamp.br/jspui/handle/REPOSIP/306627.

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Orientadores: Sueli Irene Rodrigues Costa, Simão Nicolau Stelmastchuk<br>Dissertação (mestrado profissional) - Universidade Estadual de Campinas, Instituto de Matemática, Estatística e Computação Científica<br>Made available in DSpace on 2018-08-10T23:29:23Z (GMT). No. of bitstreams: 1 Tavares_FabianoPinto_M.pdf: 877532 bytes, checksum: 0081c7182db3aab71edcbe274822bea5 (MD5) Previous issue date: 2008<br>Resumo: Neste trabalho focalizamos a deformação de cônicas e quádricas por transformações lineares. Deduzimos de forma explícita os autovalores e autovetores ortonormais de matrizes reais 2 x 2 e 3 x 3, para os quais não há quase referências na literatura e nem incorporação nos programas computacionais de cálculo simbólico usuais. Esta determinação levou -nos a estudar um pouco da história da resolução das equações de terceiro grau e das condições e formulações das raízes reais destas. Os resultados foram utilizados na determinação explícita das deformações por transformações lineares de cônicas e quádricas, sendo estas discutidas em termos de características das matrizes associadas<br>Abstract: We discuss here the deformations of conics and quadrics under linear mappings. We set explicitly the eingenvalues and the orthonormal eigenvectors of real symmetric 2 X 2 and 3 X 3 matrices. These expressions are scarce in the literature and not incorporated in symbolic calculus software. The determination of those eigenvalues leaded us to the study of the solution of third degree equations and some of related historical aspects with focus on conditions and expressions for their real solutions Those results are used in the exact determination of the linear deformation of conics and quadrics in terms of the characteristics of their associated matrices<br>Mestrado<br>Geometria Topologia<br>Mestre em Matemática
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Soberanis, Policarpio Antonio Krokhmal Pavlo. "Risk optimization with p-order conic constraints." [Iowa City, Iowa] : University of Iowa, 2009. http://ir.uiowa.edu/etd/437.

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Barbosa, Wagner Gomes. "Antena de microfita com um ou dois elementos radiadores, ressoando ao longo da Direção Azimutal, sobre Superficie Conica." [s.n.], 1995. http://repositorio.unicamp.br/jspui/handle/REPOSIP/261205.

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Orientador: Attilio Jose Giarola<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Eletrica<br>Made available in DSpace on 2018-07-20T03:01:23Z (GMT). No. of bitstreams: 1 Barbosa_WagnerGomes_M.pdf: 3650825 bytes, checksum: f822510b69368dda782a0560b0800a37 (MD5) Previous issue date: 1995<br>Resumo: Um desenvolvimento teórico é aqui apresentado para a análise de antenas de microfita sobre superfície cônica e operando no modo T MlO. Três antenas de microfita são propostas e analisadas, duas delas com um único patch e urna com dois patches, simetricamente localizados, ao redor da superfície cônica. Nessa análise, o modelo de cavidade com paredes laterais magnéticas é utilizado para o cálculo da freqüência de ressonância e da impedância de entrada. A formulação através das funções diádicas de Green é utilizada pa.ra a obtenção dos campos radiados pelas antenas, na região dos campos distantes. Resultados numéricos para essas antenas são apresentados para: 1) freqüência de ressonância, 2) impedância de entrada em função do ponto de alimentação e da freqüência e 3) diagrama de radiação. O conhecimento destes resultados é importante para o projeto das antenas consideradas<br>Abstract: A theoretical development is presented here for the analysis of microstrip antennas on a conical surface and operating in the T MIO mode. Three microstrip antennas are proposed and analyzed, two of them with a single patch and one with two patches, symmetrically located around the conical surface. In this analysis the cavity model with magnetic side walls is used for the calculation of the resonant frequency and input impedance. The dyadic Green's functions formulation is used for obtaining the fields radiated by the antennas, in the far field region. Numerical results for these antennas are shown for: 1) resonant frequency, 2) input impedance as function of feed position and of frequency, and 3) radiation pattern. The knowledge of these results is important for the design of this considered antennas<br>Mestrado<br>Mestre em Engenharia Elétrica
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Bondì, Rossella. "Geometria delle coniche e delle quadriche proiettive e sottovarietà di P^5." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018. http://amslaurea.unibo.it/17055/.

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In questa tesi vengono studiate le sottovarietà di P^5 legate alla geometria delle coniche di P^2 e delle quadriche di P^3. L'insieme di tutte le coniche di P^2 costituisce uno spazio proiettivo di dimensione 5, le coniche degeneri costituiscono una ipersuperficie di grado 3 di P^5, mentre le coniche doppiamente degeneri costituiscono una superficie di grado 4, nota come superficie di Veronese. La grassmanniana delle rette di P^3 può essere vista come una ipersuperficie di grado 2 di P^5, detta quadrica di Klein, sulla quale le due famiglie di rette di una quadrica non singolare di P^3(C) corrispondono a due famiglie di coniche.
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Raspanti, Elisa. "Sistemi lineari di curve piane." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2011. http://amslaurea.unibo.it/2604/.

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Baratov, Rishat. "Efficient conic decomposition and projection onto a cone in a Banach ordered space." Thesis, University of Ballarat, 2005. http://researchonline.federation.edu.au/vital/access/HandleResolver/1959.17/61401.

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Celik, Gul. "Parameter Estimation In Generalized Partial Linear Models With Conic Quadratic Programming." Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12612531/index.pdf.

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In statistics, regression analysis is a technique, used to understand and model the relationship between a dependent variable and one or more independent variables. Multiple Adaptive Regression Spline (MARS) is a form of regression analysis. It is a non-parametric regression technique and can be seen as an extension of linear models that automatically models non-linearities and interactions. MARS is very important in both classification and regression, with an increasing number of applications in many areas of science, economy and technology. In our study, we analyzed Generalized Partial Linear Models (GPLMs), which are particular semiparametric models. GPLMs separate input variables into two parts and additively integrates classical linear models with nonlinear model part. In order to smooth this nonparametric part, we use Conic Multiple Adaptive Regression Spline (CMARS), which is a modified form of MARS. MARS is very benefical for high dimensional problems and does not require any particular class of relationship between the regressor variables and outcome variable of interest. This technique offers a great advantage for fitting nonlinear multivariate functions. Also, the contribution of the basis functions can be estimated by MARS, so that both the additive and interaction effects of the regressors are allowed to determine the dependent variable. There are two steps in the MARS algorithm: the forward and backward stepwise algorithms. In the first step, the model is constructed by adding basis functions until a maximum level of complexity is reached. Conversely, in the second step, the backward stepwise algorithm reduces the complexity by throwing the least significant basis functions from the model. In this thesis, we suggest not using backward stepwise algorithm, instead, we employ a Penalized Residual Sum of Squares (PRSS). We construct PRSS for MARS as a Tikhonov Regularization Problem. We treat this problem using continuous optimization techniques which we consider to become an important complementary technology and alternative to the concept of the backward stepwise algorithm. Especially, we apply the elegant framework of Conic Quadratic Programming (CQP) an area of convex optimization that is very well-structured, hereby, resembling linear programming and, therefore, permitting the use of interior point methods. At the end of this study, we compare CQP with Tikhonov Regularization problem for two different data sets, which are with and without interaction effects. Moreover, by using two another data sets, we make a comparison between CMARS and two other classification methods which are Infinite Kernel Learning (IKL) and Tikhonov Regularization whose results are obtained from the thesis, which is on progress.
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Nogueira, Leonardo Bernardes. "Transformações lineares no plano e aplicações." Universidade Federal de Goiás, 2013. http://repositorio.bc.ufg.br/tede/handle/tede/3123.

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Submitted by Luciana Ferreira (lucgeral@gmail.com) on 2014-09-22T13:24:09Z No. of bitstreams: 2 Nogueira, Leonardo Bernardes.pdf: 4758026 bytes, checksum: 81be665ec243b277cb285cc686730f04 (MD5) license_rdf: 23148 bytes, checksum: 9da0b6dfac957114c6a7714714b86306 (MD5)<br>Approved for entry into archive by Luciana Ferreira (lucgeral@gmail.com) on 2014-09-23T11:17:17Z (GMT) No. of bitstreams: 2 Nogueira, Leonardo Bernardes.pdf: 4758026 bytes, checksum: 81be665ec243b277cb285cc686730f04 (MD5) license_rdf: 23148 bytes, checksum: 9da0b6dfac957114c6a7714714b86306 (MD5)<br>Made available in DSpace on 2014-09-23T11:17:17Z (GMT). No. of bitstreams: 2 Nogueira, Leonardo Bernardes.pdf: 4758026 bytes, checksum: 81be665ec243b277cb285cc686730f04 (MD5) license_rdf: 23148 bytes, checksum: 9da0b6dfac957114c6a7714714b86306 (MD5) Previous issue date: 2013-03-15<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES<br>This paper begins with a brief history about the development of vector spaces and linear transformations, then presents fundamental concepts for the study of Linear Algebra, with greater focus on linear operators in the R2 space. Through examples it explores a wide range of operators in R2 in order to show other applications of matrices in high school and prepares the ground for the presentation a version of Spectral Theorem for selfadjoint operators in R2, which says that for every operator self-adjoint T : E!E in finite dimensional vector space with inner product, exists an orthonormal basis fu1; : : : ;ung E formed by eigenvectors of T, and culminates with their applications on the study of conic sections, quadratic forms and equations of second degree in x and y; on the study of operators associated to quadratic forms, a version of Spectral Theorem could be called as The Main Axis Theorem albeit this nomenclature is not used in this paper. Thereby summarizing a study made by Lagrange in "Recherche d’arithmétique ", between 1773 and 1775, which he studied the property of numbers that are the sum of two squares. Thus he was led to study the effects of linear transformation with integer coefficients in a quadratic form in two variables.<br>Este trabalho inicia-se com um breve embasamento histórico sobre o desenvolvimento de espaços vetoriais e transformações lineares. Em seguida, apresenta conceitos fundamentais básicos, que formam uma linguagem mínima necessária para falar sobre Álgebra Linear, com enfoque maior nos operadores lineares do plano R2. Através de exemplos, explora-se um vasto conjunto de transformações no plano a fim de mostrar outras aplicações de matrizes no ensino médio e prepara o terreno para a apresentação do Teorema Espectral para operadores auto-adjuntos de R2. Este Teorema diz que para todo operador auto-adjunto T : E!E, num espaço vetorial de dimensão finita, munido de produto interno, existe uma base ortonormal fu1; : : : ;ung E formada por autovetores de T. O trabalho culmina com aplicações sobre o estudo das secções cônicas, formas quadráticas e equações do segundo grau em x e y, no qual o Teorema Espectral se traduz como Teorema dos Eixos Principais, embora essa nomenclatura não seja usada nesse trabalho (para um estudo mais aprofundado neste tema ver [3], [4], [5], [7]). Retomando assim um estudo feito por Joseph Louis Lagrange em "Recherche d’Arithmétique", entre 1773 e 1775, no qual estudou a propriedade de números que são a soma de dois quadrados. Assim, foi levado a estudar os efeitos das transformações lineares com coeficientes inteiros numa forma quadrática de duas variáveis.
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Guimarães, Itálo. "Diagonalização de operadores com aplicações à sistemas de equações diferenciais e identificação de cônicas." Mestrado Profissional em Matemática, 2018. http://ri.ufs.br/jspui/handle/riufs/8133.

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The present dissertation aims to discuss diagonalization of linear operators, so that we can explore these concepts in the solution of systems of ordinary differential equations and in the identification of conics. A linear operator in a vector space of finite dimension can be represented by a matrix. Since diagonal arrays are the simplest from the point of view of matrix operations, we will show under what conditions, given a linear operator it is possible to represent it by a diagonal matrix. Thus, this paper presents the process of operator diagonalization, introduces basic concepts about systems of ordinary differential equations and applications.<br>A presente dissertação tem como objetivo discorrer sobre diagonalização de operadores lineares, de modo que possamos explorar esses conceitos na solução de sistemas de equações diferenciais ordinárias e na identificação de cônicas. Um operador linear em um espaço vetorial de dimensão finita, pode ser representado por uma matriz. Sendo as matrizes diagonais as mais simples do ponto de vista das operações matriciais, mostraremos sob que condições, dado um operador linear é possível representá-lo por uma matriz diagonal. Dessa forma, este trabalho apresenta o processo de diagonalização de operadores, introduz conceitos básicos sobre sistemas de equações diferenciais ordinárias e aplicações.<br>São Cristóvão, SE
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Loučka, Pavel. "Měření ovality extrudovaného vlákna pomocí tří kamer." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2019. http://www.nusl.cz/ntk/nusl-401570.

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One of the important parameters observed during extruded fibre fabrication is its diameter. The diameter can be measured with a single scanning camera assuming that the fibre section has a circular shape. As proved in practice, another important parameter is ovality, that is the rate of fibre flattening. This paper assumes that the fibre section shape is elliptical. In such a case, at least three different views on examined fibre are needed. Mathematical part of this paper is concerned with analytical description of fibre ovality measurement using two different approaches based on the knowledge of linear algebra, projective geometry and conic sections theory. Main goal of this paper is thus to use both mathematical theory and image analysis methods for ovality and diameter determination. Precise calcluation of such quantities is, however, conditioned on precise camera system calibration, which is described in the paper as well. Additionally, the work contains a brief mention of technical realization of ovality measurement and its possible difficulties.
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Books on the topic "Conical liners"

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Association, Research and Education. Math Made Nice & Easy #7: Trigonometric Identities & Equations, Straight Lines, Conic Sections (Math Made Nice & Easy). Research & Education Association, 2001.

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Book chapters on the topic "Conical liners"

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d'Alessandro, Paolo. "Dual Conical Algorithms." In Conical Approach to Linear Programming. CRC Press, 2024. https://doi.org/10.1201/9781003580614-6.

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d'Alessandro, Paolo. "Linear Vector Optimization." In Conical Approach to Linear Programming. CRC Press, 2024. https://doi.org/10.1201/9781003580614-13.

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d'Alessandro, Paolo. "Determining the Maximal Face of the non-negative orthant, whose relative interior is met by a subspace." In Conical Approach to Linear Programming. CRC Press, 2024. https://doi.org/10.1201/9781003580614-8.

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d'Alessandro, Paolo. "Further Results on Parameters Variations." In Conical Approach to Linear Programming. CRC Press, 2024. https://doi.org/10.1201/9781003580614-17.

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d'Alessandro, Paolo. "The Cone sum of the non-negative orthant and a Linear Subspace." In Conical Approach to Linear Programming. CRC Press, 2024. https://doi.org/10.1201/9781003580614-11.

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d'Alessandro, Paolo. "Numerical Results." In Conical Approach to Linear Programming. CRC Press, 2024. https://doi.org/10.1201/9781003580614-21.

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d'Alessandro, Paolo. "Implementation of the Dual Algorithm." In Conical Approach to Linear Programming. CRC Press, 2024. https://doi.org/10.1201/9781003580614-19.

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d'Alessandro, Paolo. "Essential Background." In Conical Approach to Linear Programming. CRC Press, 2024. https://doi.org/10.1201/9781003580614-3.

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d'Alessandro, Paolo. "Conical Optimality Conditions for Linear Programming." In Conical Approach to Linear Programming. CRC Press, 2024. https://doi.org/10.1201/9781003580614-5.

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d'Alessandro, Paolo. "The Primal Conical Algorithm." In Conical Approach to Linear Programming. CRC Press, 2024. https://doi.org/10.1201/9781003580614-12.

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Conference papers on the topic "Conical liners"

1

Mulligan, Phillip, Catherine Johnson, Jason Ho, Cody Lough, and Edward Kinzel. "3D Printed Conical Shaped Charge Performance." In 2019 15th Hypervelocity Impact Symposium. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/hvis2019-110.

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Abstract A Conical Shaped Charge (CSC) is a versatile device utilized in construction, mining, petroleum and defense industries. The geometry and material structure of the metal liner play an integral role in the CSC performance. The performance of CSC liners has been relatively well-characterized for liners manufactured via hydroforming, hydraulic pressing, or turning on a CNC lathe. With advancements in Additive Manufacturing (AM) CSC liners can be 3D printed with metal powders. AM can provide significant design freedom in terms of realizing better properties through introduced hierarchic structuring or anisotropy. However, it is unclear as to how metal liners produced with Selective Laser Melting (SLM), will influence the conical shaped charge’s performance. This paper explores the performance, relative to the penetration of steel plates, of CSCs using 3D printed metal liners benchmarked against machined liners. The metal liners were printed with SLM parameters that were optimized to maximize the print density. The metal liner dimensions (thickness, height, and outer diameter) were designed using the recommended ratios of the liner’s inner diameter presented by Virgil (1988). The 3D printed metal liners are compared to a CNC machined liner, with the same dimensions. The comparison enables the evaluation of how 3D printing a liner influences penetration performance. The results indicate conical shaped charges could utilize 3D printed liners. These results open a wide range of performance design opportunities that cannot be achieved via conventional manufacturing and justify the current increased cost associated with additive manufacturing metal components. Future work will continue to explore how print density, printed material, and advanced geometries modify the conical shaped charge performance.
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Gasilov, VA, A. S. Boldarev, S. V. D'yatchenko, et al. "MHD simulation of conical plasma liners implosion." In 2008 IEEE 35th International Conference on Plasma Science (ICOPS). IEEE, 2008. http://dx.doi.org/10.1109/plasma.2008.4591076.

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Langendorf, S. J., S. C. Hsu, J. P. Dunn, et al. "Spectroscopic Measurements of the Formation of a Conical Section of Spherically Imploding Plasma Liners*." In 2017 IEEE International Conference on Plasma Science (ICOPS). IEEE, 2017. http://dx.doi.org/10.1109/plasma.2017.8496120.

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Mazdeh, Alireza, and Ahmad Reza Kashani. "Numerical Modeling of the Acoustic Damping of Perforated Liners With Bias Flow." In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-62629.

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Acoustic damping properties of perforated liners are highly dependent on a number of variables which can be categorized as “flow variables” such as the extent and Mach number of grazing flow as well as bias flow and “geometric variable” such as the shape of the hole which can be rectangular, cylindrical, conical with diverging or converging nozzle, thickness to radius ratio, radius to hole spacing ratio and hole orientation which can be normal to or inclined with respect to the perforated plate. Theoretical and empirical approaches have provided the foundation for understanding the damping properties of liners but they are based on certain simplifying assumptions making them inadequate in addressing the realistic conditions encountered in industrial applications. These limitations have highlighted the importance of numerical methods for studying damping behavior of liners. Acoustic attributes of perforated plates (mainly in terms of impedance as a function of non-dimensional variables like Reynolds, Strouhal, Mach, and Helmholtz numbers have been studied by various researchers, including the authors, using a variety of numerical tools starting from the simple 1D network scheme based on linear acoustics all the way to the computationally intensive Large-Eddy Simulations (LES) and Scaled Adaptive Simulation (SAS) reconstructing the full unsteady turbulent structures. Although the impacts of some geometry variations such as hole inclination angle and diameter, in conjunction with various fluid dynamic parameters, have been investigated using 1D network tools, the focus of LES has been mainly on analysis of a single circular hole with periodic boundary conditions as the representation of multi-perforation (assuming the perforations are spaced far enough from each other so that there is no interaction between neighboring holes). There is certainly a need for thorough investigation of the acoustic impact of these geometric parameters as well as the shape of the holes using LES. In an on-going research we are extending the numerical modeling work on characterizing the acoustic damping attributes of a perforation, beyond the current state of the art, by including the geometric variables including hole size, shape, orientation, and radius to thickness ratio, amongst others, in the study. In this paper, following a short review of the research conducted in the recent past, we present our findings on the impact of the thickness/radius ratio on the acoustic damping attribute of a perforation.
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Mazdeh, Alireza, and Reza Kashani. "The Impact of Perforation Geometry on Acoustic Damping Attributes of a Perforated Liner With Bias Flow." In ASME Turbo Expo 2012: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/gt2012-69727.

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Acoustic damping properties of perforated liners are highly dependent on a number of variables which can be categorized as “flow variables” such as the extent and Mach number of grazing flow as well as bias flow and “geometric variable” such as the shape of the hole which can be rectangular, cylindrical, conical with diverging or converging nozzle, thickness to radius ratio, radius to hole spacing ratio and hole orientation which can be normal to or inclined with respect to the perforated plate. Many of these variables were not incorporated in previous studies. Theoretical and empirical approaches have provided the foundation for understanding the damping properties of liners but they are based on certain simplifying assumptions making them inadequate in addressing the more realistic conditions encountered in industrial applications. These limitations have highlighted the importance of numerical methods for studying damping behavior of liners. Acoustic attributes of perforated plates (mainly in terms of impedance which is a frequency-dependent complex quantity) as a function of non-dimensional variables like Reynolds, Strouhal, Mach, and Helmholtz numbers have been studied by various researchers, including the authors, using a variety of numerical tools starting from the simple 1D network scheme based on linear acoustics and the wall compliance concept introduced by Howe all the way to the computationally intensive Large-Eddy Simulations (LES) and Scaled Adaptive Simulation (SAS) reconstructing the full unsteady turbulent structures. Although the impacts of some geometry variations such as hole inclination angle and diameter, in conjunction with various fluid dynamic parameters, have been investigated using 1D network tools, the focus of LES has been mainly on analysis of a single circular hole with periodic boundary conditions as the representation of multi-perforation (assuming the perforations are spaced far enough from each other so that there is no interaction between neighboring holes). There is certainly a need for thorough investigation of the acoustics impact of these geometric parameters as well as shape of the holes using LES. In an on-going research we are extending the numerical modeling work on characterizing the acoustic damping attributes of a perforation, beyond the current state of the art, by including the geometric variables including hole size, shape, orientation, and radius to thickness ratio, amongst others, in the study. In this paper, following a short review of the research conducted in the recent past for comprehension of the acoustic-vortex interaction mechanism in perforated liners resulting in acoustic absorption, we present the findings on the impact of thickness/radius ratio on the acoustic damping attribute of a perforation. The verification of the CFD results are done by comparing the data with analytical solutions.
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Miers, Kevin T., Daniel L. Prillaman, and Nausheen M. Al-Shehab. "Optimized Impact Mitigation Barriers for Insensitive Munitions Compliance of a 120mm Warhead." In 2019 15th Hypervelocity Impact Symposium. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/hvis2019-105.

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Abstract The U.S. Army Combat Capabilities Development Command (CCDC) Armaments Center at Picatinny Arsenal, NJ is working to develop technologies to mitigate the violent reaction of a 120 mm warhead, loaded with an aluminized HMX-based enhanced blast explosive, when subjected to the NATO Insensitive Munitions (IM) Fragment Impact (FI) test. As per NATO STANAG 4496, FI testing is conducted at 8300±300 ft/s with a 0.563” diameter, L/D~1, 160˚ conical nosed mild steel fragment. Reaction violence resulting from FI can be mitigated by the use of liners or barriers applied to the munition itself or its packaging, commonly referred to as a Particle Impact Mitigation Sleeves (PIMS). Previous development efforts for this item focused on a lightweight plastic warhead support which was able to reduce the severity of the input shock sufficiently to prevent high order detonation. However, violent sub-detonative responses were still observed which occurred over several hundred microseconds, consumed part of the explosive charge, and ejected hazardous debris over large distances. These responses are driven by rapid combustion coupled with damage to the explosive as well as mechanical confinement. Quantitative modeling of these scenarios is a challenging active research area. Prior experimental results and modeling guidance have shown that mitigation of these reactions requires a more substantial reduction in the overall mechanical insult to the explosive. In particular, steel and aluminum PIMS have been able to efficiently provide the necessary fragment velocity reduction, breakup and dispersion in typical packaging applications. Packaged warheads were tested at the GD-OTS Rock Hill facility with several PIMS designs incorporated into the ammunition containers. Several designs were demonstrated to provide benign reactions with minimal added weight. Future iterations will attempt to further improve the design using advanced lightweight barrier materials.
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Boyashova, Elena, Denis Voloshinov, and Tatyana Musaeva. "A Constructive Algorithm for Transforming Conics in a Circle on Imaginary Laguerre Points." In 31th International Conference on Computer Graphics and Vision. Keldysh Institute of Applied Mathematics, 2021. http://dx.doi.org/10.20948/graphicon-2021-3027-673-681.

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The article is devoted to the consideration of the properties of Laguerre points in their constructive relationship with the solution of the problem of transforming a pair of conical curves into two circles. Geometric schemes are presented that reveal the principle of specifying a collinear transformation that establishes a correspondence between conics and their images in the form of circles, including if the Laguerre points defining this transformation are imaginary. In the solution of the problem, a geometric scheme for the formation of the main conjugations of conics is given, one of which is a circle. The conclusion is substantiated that the radical axis of the bundle of circles is a circle that has split into a pair of straight lines, one of which is infinitely distant. An algorithm for the formation of a series of elliptic curves induced by Laguerre points is presented.
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Preece, Dale S., Jerome H. Stofleth, David L. Cole, and Paul W. Cooper. "Design of Conical Shaped Charges for Prompt Initiation of TNT Chemical Munition Bursters." In ASME 2002 Pressure Vessels and Piping Conference. ASMEDC, 2002. http://dx.doi.org/10.1115/pvp2002-1151.

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The Explosive Destruction System (EDS) has been designed at Sandia National Laboratories for the disposal of chemical munitions (phosgene, mustard gas, sarin etc.), many dating back to World War I. EDS is a portable system that is trailer mounted and consists of a vessel into which a chemical munition can be loaded and neutralized with linear and conical shaped charges. Gases are contained within the sealed chamber. The linear shaped charges split the munition in two and the conical is aimed at the explosive burster, in each munition, which is detonated by the shaped charge jet. Toxic chemicals remaining in the vessel following detonation are neutralized and disposed of. This paper documents the development of a new conical shaped charge (CSC) needed to reliably detonate explosive bursters in an expanding array of chemical munitions that are beyond what the device was originally designed to neutralize. Design of this new CSC was controlled by the need to deliver energy above the detonation threshold into the explosive after penetrating the outer steel casing, fluid, the burster casing and finally the explosive. Design considerations were driven by jet conditions at the steel/explosive interface inside the burster. Parameters to consider in CSC design include: 1) diameter, 2) liner thickness, 3) liner position in body, 4) explosive weight, and 5) liner shape or interior angle. The effects of these parameters on final CSC performance are examined in detail. CSC’s meeting the design specifications have been manufactured and tested. The performance of these charges is compared with the original design requirements.
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Gadala, Ibrahim M., Yannick Beauregard, and Michael Martens. "Experimental Studies of Compression and Impact Behaviours of Traditional Versus Alternative Polymer Support Materials for Pipelines." In 2024 15th International Pipeline Conference. American Society of Mechanical Engineers, 2024. https://doi.org/10.1115/ipc2024-134113.

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Abstract Non-metallic materials such as polymers and woods are commonly used as pipeline supports to distribute loads and dissipate mechanical vibrations. Neoprene is a synthetic rubber material widely used for these purposes but is softer than other common polymer materials such as Ultra High Molecular Weight Polyethylene (UHMW) or Polytetrafluoroethylene (PTFE). It is also generally less available and more expensive than natural materials like woods. Because there is an apparent lack of data on the compressive and impact resistance behaviors of pipe support materials, dedicated experiments were conducted on Neoprene, UHMW, Polyethylene (PE), PTFE, Polyvinyl Chloride (PVC), Polyurethane (PU), and wood samples in this study. The influences of several factors such as temperature, layering, strain rate, and vibration frequency were evaluated. Understanding the differences in mechanical behaviour of these materials is important for pipeline design and stress calculations/simulations. For compression tests, a 10″ (25.4 cm) diameter conical shaped custom compression platen was designed and analyzed numerically with Finite Element Analysis (FEA) to ensure it met specific weight, maximum deflection, and alignment requirements. These custom platens were fabricated for the experiments from 1018 steel case-hardened for durability and stiffness. For impact experiments, a 12″ (30.5 cm) diameter pipe was set up on a supporting bracket with isolation liners (test materials) sandwiched between the pipe and the support and between the pipe and the bracket. Accelerometer sensors were installed on the pipe and underneath the two support legs of the assembly. Transfer functions on the pipe wall and underneath left and right support legs were measured when impacted using a calibrated force hammer. Compression tests under monotonic loading showed that PTFE was the stiffest material tested at maximum load, approximately 18% stiffer than Neoprene. Layering had an insignificant effect on the final compressive strain values at the maximum compressive load. However, between 10–100 MPa (1.45 ksi – 14.5 ksi) during the compression stroke, the stiffness of the overall sample is ∼10% lower with more than one layer. Impact tests revealed that PVC and Neoprene materials were more effective than PU in dampening the vibration response in the lower frequency range up to 700 Hz and higher frequency vibrations in the range 1000 Hz through 2000 Hz. None of the tested materials were effective in dampening the pipe vibrations excited in the range between 700 Hz and 1000 Hz.
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Choudhury, Pretam K., Ashkan Davanlou, Eduardo Castillo Orozco, and Ranganathan Kumar. "Global and Local Measurements and Proper Orthogonal Decomposition of a Swirling Conical Liquid Sheet." In ASME 2016 Fluids Engineering Division Summer Meeting collocated with the ASME 2016 Heat Transfer Summer Conference and the ASME 2016 14th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/fedsm2016-7860.

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In this work, ultra-high speed imaging of conical liquid sheets allows for non-invasive measurements of both global and local features of a swirling conical liquid sheet. The breakup of the swirling conical liquid sheet is visualized and the interface tracked between the conical liquid sheet and the ambient air. The applied experimental technique and the image processing technique capture planar images that are capable of tracking the dynamic behavior of the conical liquid sheet. Cone angle is shown to increase up to a critical Weber Number. The film length is obtained by identifying singular points in the signal response of the radial fluctuations. The results of the proper orthogonal modes indicate the existence of traveling waves on the interface of the swirling conical liquid sheet. Wavelength measurements of the traveling waves are comparable with linear instability analysis.
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Reports on the topic "Conical liners"

1

Vigil, M. G. Conical shaped charge pressed powder, metal liner jet characterization and penetration in aluminum. Office of Scientific and Technical Information (OSTI), 1997. http://dx.doi.org/10.2172/486089.

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Terlaky, Tamas. Mixed-Integer Conic Linear Programming: Challenges and Perspectives. Defense Technical Information Center, 2013. http://dx.doi.org/10.21236/ada590477.

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