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Academic literature on the topic 'Trochoids'

Author: Grafiati
Published: 10 December 2022
Last updated: 28 January 2023

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Journal articles on the topic "Trochoids"

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Ziaei, Masoud. "Bending Stresses and Deformations in Prismatic Profiled Shafts with Noncircular Contours Based on Higher Hybrid Trochoids." Applied Mechanics 3, no. 3 (August 23, 2022): 1063–79. http://dx.doi.org/10.3390/applmech3030060.

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This paper presents an analytical method for determining the bending stresses and deformations in prismatic, noncircular profile shafts with trochoidal cross sections. The so-called higher trochoids can be used as form-fit shaft-hub connections. Hybrid (mixed) higher trochoids (M-profiles) were developed for the special application as a profile contour for the form-fit shaft and hub connections in an earlier work by the author. M-profiles combine the advantages of the two standardised polygonal and spline contours, which are used as shaft-hub connections for the transmission of high torques. In this study, the geometric and mechanical properties of the higher hybrid trochoids were investigated using complex functions to simplify the calculations. The pure bending stress and shaft deflection were determined for M-profiles using bending theory based on the theory of mathematical elasticity. The loading cases consisted of static and rotating bends. Analytical, numerical, and experimental results agreed well. The calculation formulas developed in this work enable reliable and low-cost dimensioning with regard to the stresses and elastic deformations of profile shafts subjected to bending loads.
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Abele, E., M. Weber, and C. Daume. "Spindelwälzlagerbelastung beim trochoiden Fräsen*/Spindle bearing load during trochoidal milling." wt Werkstattstechnik online 108, no. 10 (2018): 730–35. http://dx.doi.org/10.37544/1436-4980-2018-10-94.

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In den vergangenen 15 Jahren wurde die Prozessvariante des trochoiden Fräsens weiterentwickelt und wird gegenwärtig in der Schruppbearbeitung eingesetzt. Höhere Zeitspanvolumina bei gleichzeitig geringerem Werkzeugverschleiß sind gegenüber dem konventionellen Fräsen erzielbar. Das trochoide Fräsen besitzt eine verfahrenstypische Dynamik, deren Auswirkung auf die Lagerbelastung der Motorspindel mithilfe von Zerspanversuchen und einer Mehrkörpersimulation untersucht wird.   In the past 15 years the trochoidal milling process has been developed. Currently it is used for roughing operations. Higher metal removal rates including lower tool wear compared to the conventional linear milling can be achieved. The trochoidal milling has a distinctive process dynamic whose impact on the bearing load of the motor spindle is investigated. Therefore, trochoidal und linear cutting tests are performed as well as a multi-body simulation including the motor spindle.
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Hall, Leon M. "Trochoids, Roses, and Thorns-Beyond the Spirograph." College Mathematics Journal 23, no. 1 (January 1992): 20. http://dx.doi.org/10.2307/2686194.

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Pasali Atmaca, Sibel. "The geometry of map equations for Trochoids." New Trends in Mathematical Science 2, no. 6 (March 20, 2018): 6–18. http://dx.doi.org/10.20852/ntmsci.2018.265.

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Hall, Leon M. "Trochoids, Roses, and Thorns—Beyond the Spirograph." College Mathematics Journal 23, no. 1 (January 1992): 20–35. http://dx.doi.org/10.1080/07468342.1992.11973429.

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Farrington, Eleanor. "Parametric Equations at the Circus: Trochoids and Poi Flowers." College Mathematics Journal 46, no. 3 (May 2015): 173–77. http://dx.doi.org/10.4169/college.math.j.46.3.173.

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Wagner, Peter J. "Phylogenetics of the Early Paleozoic Archaeogastropoda." Paleontological Society Special Publications 6 (1992): 300. http://dx.doi.org/10.1017/s2475262200008601.

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The Archaeogastropoda are one of the most abundant orders of the Paleozoic, but they have received surprizingly little systematic analysis. I have conducted a cladistic analysis of archaeogastropod species appearing during the initial radiation of the clade during the latest Cambrian through the Ordovician. The analysis included over 100 species. Most specimens were from North America, but some European and Asian material was included. The hypothesized phylogeny also includes an additional 40 Ordovician species from a previous cladistic work on a single family (the Lophospiridae), and only the stem members of this clade were included here.The analysis used 54 meristic and 12 morphometric traits encompassing 154 character states. This seemingly large number of character states for a group considered character-poor can be attributed to: 1) the breadth of morphologic diversity produced during the initial phases of the clade's radiation, resulting in nearly all conceivable morphologies being included here; and 2) the high number of character states for “types” of selenizones and sinuses, morphologies absent on most extant gastropods.The results of the analysis suggest the following:1. There were two large clades present by the Early Ordovician that most closely correspond to present definitions of the Murchisonoidea and Euomphaloidea. The clades shared an anisostrophically coiled common ancestor and thus were not derived separately from bellerophonts. However, the Macluritidae appear to have been derived separately from bellerophonts, corroborating a widely held hypothesis.2. Early Paleozoic species presently considered “pleurotomaroids” comprise a polyphyletic assemblage, with the major families independently derived from either the murchisonoid clade (the Eotomaridae, Lophospiridae and Phanerotrematidae) or from the euomphaloid clade (the Liospiridae, Luciellidae and post-Middle Ordovician members of the Raphistomatidae). It had been assumed previously that pleurotomaroids represent the least-derived anisostrophically coiled gastropods, as well-developed selenizones and sinuses were considered primitive traits. However, those features actually represent derived conditions of the Ordovician that appear to have been secondarily lost in later lineages; thus seemingly “modern” appearing early Paleozoic species often simply retained non-derived conditions. As the Mesozoic Pleurotomaria can not be linked with any Early Paleozoic clades, there is no basis for classifying early Paleozoic gastropods in the Pleurotomaroidea.3. The Subulitoidea and Loxonematoidea (which may be ancestral to the Caenogastropoda) evolved separately from murchisonoids. The origins of the Trochoidea are not clear. If the Holopeidae represent the stem members of the Trochoidea, then trochoids evolved from euomphaloids. However, the Platyceratidae also have been linked with trochoids. The earliest known members of that group possess many unique homologies and no obvious synapomorphies with any other archaeogastropods. The taxon can not be linked reliably with holopeids or any other taxon included in this study, and I do not discount the possibility that platyceratids were evolved separately from bellerophonts.4. Gross shell convergences abound, as turritelliform and planispiral-to-hyperstrophic shells both evolved at least four times. However, the combinations of character states used to achieve these gross morphologies differ among clades, allowing “homoplasies” of character complexes to be recognized.
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Salleh, Noor Deenina Haji Mohamed, and Somnuk Phon Amnuaisuk. "Quantifying aesthetic beauty through its dimensions: a case study on trochoids." International Journal of Knowledge Engineering and Soft Data Paradigms 5, no. 1 (2015): 51. http://dx.doi.org/10.1504/ijkesdp.2015.073479.

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Su, Xiaogen, and Donald R. Houser. "Characteristics of trochoids and their application to determining gear teeth fillet shapes." Mechanism and Machine Theory 35, no. 2 (February 2000): 291–304. http://dx.doi.org/10.1016/s0094-114x(99)00004-x.

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Omirou, Sotiris L., and Marios M. Fyrillas. "A CNC Manufacturing Method for Parts with Trochoidal Profile." Journal for Manufacturing Science and Production 14, no. 2 (August 29, 2014): 103–13. http://dx.doi.org/10.1515/jmsp-2013-0024.

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AbstractThis paper presents a manufacturing method for parts with trochoidal profile on CNC milling machines. The method is based on a new real-time interpolation algorithm capable to drive the cutter along the offset of trochoid curves with precision equal to the resolution of the machine. The structure of the presented algorithm may be adapted accordingly so as to be used either for parts with an epitrochoidal or a hypotrochoidal profile. Both types of curves, known as trochoid curves, have important industrial applications such as gears with trochoidal tooth-profile, cams, trochoidal-shaped housings for rotary internal combustion engines and rotary piston pumps etc. The effectiveness and accuracy of the proposed method is verified by simulation tests of the generated tool path for the machining of two representative mechanical parts, an inner rotor of a hypogerotor pump and an epitrochoidal-shaped housing.
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Dissertations / Theses on the topic "Trochoids"

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Dornellas, Ana Paula Siqueira. "Anatomia comparada de Calliostoma adspersum, C. depictum e C. hassler (Vetigastropoda: Trochidae) da costa brasileira." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/41/41133/tde-13072012-092105/.

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Foi estudada a morfologia externa e interna de Calliostoma adspersum, C. depictum e C. hassler, procedentes da costa brasileira. Tegula viridula também foi estudada como parâmetro comparativo externo. Foi possível averiguar características anatômicas que diferenciam todas as espécies entre si. Diferenças significativas foram encontradas principalmente nas seguintes estruturas: concha; coloração e papilas do pé; musculatura do odontóforo; esôfago anterior; estômago; ceco em espiral e alça intestinal. Calliostoma, de acordo com dados preliminares, diferencia-se dos demais troquídeos por apresentar: redução ou perda dos lobos cefálicos; pseudoprobóscide; presença de ampola renal; uma alça intestinal fora da hemocela e o músculo m1d do odontóforo.
The external and internal morphology of Calliostoma adspersum, C. depictum and C. hassler, from Brazilian coast, was studied. Tegula viridula was also analyzed as outgroup. Anatomical characteristics that differentiate all species were found. The major differences were found mainly in the structures: shell; color and papillaes foot; odontophore musculature; anterior esophagus; stomach; spiral caecum and intestinal looping. Calliostoma, according to preliminary data, differentiates from other Trochidae in presenting: reduction or lost of cephalic lappets; pseudoproboscid; renal ampolla; intestinal looping outside haemocoel and m1d odontophore muscle
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Bartl, Lukáš. "Racionalizace výroby součásti." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2017. http://www.nusl.cz/ntk/nusl-318781.

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The assigned thesis is focused on the proposal of rationalization solutions to the component Bonnet, which is a standard representative of the most important sections of broader spectrum of customer´s components. The introduction part describes the component basis, according to which the standard representative was chosen, later on characterised from the point of view of seriality. The following large part of classfying the time comsumption in machinery is essential for the calculations as such, which are the essential part of this dissertation. The proposal of production rationalization is concerned with the exclusion of unnecessary losses and using existing ressources with the help of a higher level of machinery, technology, work organisation, production and management, which lead to a higher labour productivity. The technological production preparation ensures the documentation processing, the proposal of semi-finished product, machines, fastening, measuring and calculation of necessary technological specifications for ensuring the production. In the final part, there is to be found the technical and economical evaluation of rationalization proposals, which numerically evaluates the analysed outputs of this thesis.
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Gazda, Silvester. "Výpočtové modelování tuhosti záběru ozubených kol." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2017. http://www.nusl.cz/ntk/nusl-318524.

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This master's thesis deals with the design of FEM model of gear pair with an intention to find out how stiffness changes during meshing. It firstly describes the necessary knowledge needed to analyse the problem, like the geometry of an involute tooth and evaluation of meshing stiffness. Followed by a description of work procedures from the creation of models through settings of mesh, contacts and analysis to evaluating of results.
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Dornellas, Ana Paula Siqueira. "Análise cladística da subfamília Tegulinae (Vetigastropoda: Turbinidae)." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/38/38131/tde-30062016-105418/.

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A subfamília Tegulinae é composta por 44 espécies viventes descritas em seis gêneros. Ocorrem nas águas tropicais e subtropicais do Pacífico Oriental, no Caribe, na costa pacífica da América, na costa atlântica da América do Sul e no leste da Ásia, habitando as regiões entre marés e infralitoral. Os tegulíneos foram definidos taxonomicamente por apresentarem: (i) opérculo com o crescimento da borda curto; (ii) perda da habilidade de depositar carbonato de cálcio no opérculo; (iii) rádula com dente raquidiano sem uma cúspide secundária ou aba para prover uma fixação adicional na fita radular. O posicionamento do táxon dentro de Trochoidea nunca foi bem estabelecido e a posição sistemática dos grupos internos de tegulíneos nunca foi investigada como objetivo primário. O presente trabalho abordado no Capítulo 1 apresenta um estudo morfológico detalhado de alguns representantes de Tegulinae e Trochoidea visando testar a monofilia da subfamília, bem como elucidar o posicionamento filogenético dos gêneros que a compõem e seu posicionamento em Trochoidea. Todos os gêneros, exceto Catallocostoma, foram incluídos. As espécies polimórficas Agathistoma hotessierianum, A. patagonicum e A. viridulum foram compostas em subunidades monomórficas, totalizando o grupo-interno em 23 terminais. O grupo-externo incluiu 24 terminais, com representantes das famílias de Trochoidea, além de uma espécie de Pleurotomarioidea (Perotrochus atlanticus), considerada a raiz. Uma análise cladística foi realizada, com buscas heurísticas com pesos iguais e pesagem diferencial. O resultado da análise demonstrou a monofilia de Tegulinae, grupo-irmão de Prisogaster niger, alocada na família Turbinidae. Os gêneros formaram grupos monofilético, embora Tegula excavata não demonstrasse um posicionamento bem definido nas análises alternativas. As espécies polimórficas não foram consideradas como espécies nominais distintas, pois foi constatado que os caracteres que separam cada espécie em subamostra têm alto grau de plasticidade. Caracteres morfológicos foram testados pela primeira vez em um grupo hierarquicamente baixo em Trochoidea e tiveram valor significativo na definição de linhagens internas. O Capítulo 2 teve como objetivo inserir todos os táxons analisados no Capítulo 1, na análise filogenética de Caenogastropoda de Simone (2011). A análise resultou em Vetigastropoda monofilético. A parafilia de Zeugobranchia foi corroborada com outras hipóteses filogenéticas, bem como a monofilia de Trochoidea. As famílias Calliostomatidae, Trochidae, Turbinidae e Margaritidae não formaram um grupo monofilético. A monofilia de Tegulinae foi corroborada, grupo-irmão do clado Prisogaster niger+, bem como os gêneros Intistoma aureotinctum, Norrisia, Chlorostoma e Agathistoma.
Tegulinae encompasses 44 extant species belonging to six genera. They occur in tropical and subtropical waters of the Eastern Pacific, Caribbean, on the Pacific coast of America, Atlantic coast of South America and East Asia, inhabiting intertidal to shallow sublittoral areas. Tegulines are taxonomically defined by (i) a short growing edge of operculum, (ii) inability to calcify the operculum and (iii) rachidian tooth lacking a secondary cusp or flap providing additional attachment to the radular ribbon. A consensual placement of tegulines within Trochoidea has not yet been reached, and the systematic positions of the genera have never been investigated as a primary objective. A cladistics analysis of the subfamily based on detailed morphology is presented herein on Chapter 1, aimed at testing the groups monophyly. Additionally, the phylogenetic positions of the genera are investigated along with the phylogenetic position of Tegulinae within Trochoidea. The sampled ingroup included representatives of all genera except for Cantallocostoma; the polymorphic species Agathistoma hotessierianum, A. patagonicum and A. viridulum were subdivided into monomorphic taxa, totaling 23 ingroup terminals. The outgroup comprised 24 terminals including representatives of trochoidean families. The Pleurotomarioidea were represented by Perotrochus atlanticus, which was also used as root. Cladistics analysis included heuristic searches carried with equal and differential weighting. Results presented here indicate that Tegulinae are monophyletic, being sister to Prisogaster niger and belonging to the family Turbinidae. The genera studied herein were supported as clades, despite the non-consensual position of Tegula excavata between alternative hypotheses. Polymorphic species were considered non-distinct nominal species, since the characters that divide them into subsamples are highly plastic. Morphological characters were used for the first time to support a hierarchically low-level group for Trochoidea and had significant value in the definition of internal lineages. On Chapter 2, the analyzed taxa from the previous chapter were added to Simones (2011) phylogenetic hypothesis of Canogastropoda in order to investigate the phylogenetic position of Trochoidea in a broader scenario. The results support the monophylies of Vetigastropoda and Trochoidea, and indicate the paraphyly of Zeugobranchia, corroborating previous hypotheses. Tegulinae is a monophyletic group, sister to Prisogaster niger+, Intistoma aureotinctum, Norrisia, Chlorostoma and Agathistoma.
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García, Vílchez Mercedes. "Design tools applied to a trochoidal gear pump." Doctoral thesis, Universitat Politècnica de Catalunya, 2014. http://hdl.handle.net/10803/277538.

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Positive displacements pumps, as currently designed, produce significant flow pulsations that result in pressure pulsations. These pulsations contribute to the global noise generated by the installation. Moreover, they interact with the system where the pump is connected shortening the life of both the pump and circuit components. Rotary trochoidal gear pump, a type of rotary positive displacement machine, has characteristics that make it suitable for many applications fields. Nowadays, in cases like additivation and dosage, these applications have not been completely developed, and present a growing potential in the industrial world, such as in new diesel engines generation or in medical applications. The thesis presents a set of design tools applied to trochoidal gear pumps, from the viewpoint of the fluid dynamical performance of the pump. These design tools are aimed to help improving two of the main performance indices of the pump: the volumetric capacity and the flow irregularity, leading the designer to more efficient new designs of gerotor pumps. On the one hand, the volumetric capacity is related with the pump's efficiency, and increases in this particular index result in a higher efficiency of the pump. On the other hand, flow irregularity measures de flow ripple generated by the pump, and by reducing this index, the life of both the pump and the installation can be extended, as phenomena like fatigue are attenuated. This is achieved through the use of analytical, simulation and experimental procedures. From the analytical side, two new modules of GeroLAB Package are created, Minimum Clearance Module and Effective Port Areas. Also, a dynamical simulation through BondGraph is conducted, studying the influence of the port areas geometry. In the present thesis, the model has been improved by adding the information of the effective port areas, thus making it more realistic. Regarding the numerical simulation, a three-dimensional with deforming mesh Computational Fluid Dynamics model is presented. The model includes the effects of the manufacturing tolerance and the leakage inside the pump. Also, the influence of simulating the contact points is studied. A new boundary condition is created for the simulation of the solid contact in the interteeth radial clearance, established as a fluid-dynamic condition. The experimental study of the pump is carried out by means of Time-Resolved Particle Image Velocimetry. This technique is developed in order to adapt it to the gerotor pump, and measurements are captures in the outlet pipe and in the chambers between trochoidal profiles. Results are qualitatively evaluated thanks to the analytical and simulation tools. The presented experimental procedure meets the need of a methodology to directly measure the flow ripple generated by the pump, with a non-intrusive technique. It constitutes an alternative to the Secondary Source Method, and it is the first approach of Time-Resolved Particle Image Velocimetry applied to a trochoidal gear pump, according to the author's knowledge.
Las bombas de desplazamiento positivo, en su diseño actual, producen pulsaciones de caudal significantes que resultan en pulsaciones de presión. Estas pulsaciones contribuyen al ruido global generado por la instalación. Además, interactúan con el sistema al cual se encuentra conectada la bomba, reduciendo la vida útil tanto de la bomba como de los componentes del circuito. La bomba rotativa de engranajes trocoidales, un tipo de máquina rotativa de desplazamiento volumétrico, tiene características que hacen que sea adecuada en muchos campos de aplicación. Actualmente, en casos como la aditivación o la dosificación, estas aplicaciones no han sido completamente desarrolladas, y prestan un creciente potencial en el mundo industrial, como en nuevas generaciones de motores diesel o en aplicaciones médicas. La tesis presenta un conjunto de herramientas de diseño aplicadas a bombas de engranajes trocoidales, desde el punto de vista del comportamiento fluidodinámico de la bomba. Estas herramientas de diseño están orientadas a ayudar a la mejora de dos de los principales índices de la bomba: la capacidad volumétrica y la irregularidad en el caudal, dirigiendo al diseñador a nuevos diseños de bombas gerotor más eficientes. Por un lado, la capacidad volumétrica está relacionada con la eficiencia de la bomba, e incrementos en este índice resultan en una mayor eficiencia de la bomba. Por otro lado, la irregularidad en el caudal mide el las fluctuaciones en el caudal generado por la bomba, y reduciendo este índice, la vida útil de la bomba y de la instalación puede ser aumentada, ya que fenómenos como la fatiga se ven atenuados. Esto se consigue a través del uso de procedimientos analíticos, de simulación y experimentales. Desde el punto de vista analítico, se han creado dos nuevos módulos para el software GeroLAB Package, denominados Minimum Clearance Module y Effective Port Areas. También se ha llevado a cabo una simulación dinámica de BondGraph, estudiando la influencia de la geometría de las lumbreras. En esta tesis, el modelo se ha mejorado añadiendo la información de las secciones efectivas de las lumbreras, obteniendo así un modelo más realista. En relación con la simulación numérica, se presenta un modelo de dinámica de fluidos computacional (CFD) tridimensional y con malla deformable. El modelo incluye los efectos de las tolerancias de fabricación y las fugas en el interior de la bomba. Además, también se estudia la influencia de simular los puntos de contactos entre dientes. Se crea una nueva condición de contorno para la simulación del contacto sólido en las holguras radiales entre dientes, establecida como una condición fluidodinámica. El estudio experimental de la bomba se lleva a cabo mediante resolución en tiempo de Velocimetría de Imágenes de Partículas (TRPIV). Esta técnica se adapta a la bomba gerotor, y las medidas obtenidas son capturas en la tubería de salida y en las cámaras entre perfiles trocoidales. Los resultados se evalúan cualitativamente gracias a las herramientas analíticas y de simulación. El procedimiento experimental presentados responde a la necesidad de una metodología para medir de manera directa el caudal generado por la bomba, con una técnica no intrusiva. Constituye una alternativa al método de la fuente secundaria, y es la primera aproximación de TRPIV aplicado a una bomba de engranajes trocoidales, de acuerdo con el conocimiento de la autora
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Soukupová, Veronika. "Optimalizace obráběcího procesu s průmyslovou aplikací na obráběcím centru." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2020. http://www.nusl.cz/ntk/nusl-432721.

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Tato diplomová práce byla vypracována v průmyslovém kontextu, během stáže ve firmě Metso. Zlepšení obráběcího procesu zajišťovacích šroubů bylo cílem této práce, aby byla umožněna budoucí automatizace zakládání obrobku do stroje. Zlepšení bylo zhodnoceno na základě úrovně autonomie během obrábění, eliminace neprogramovaných zastavení stroje operátorem a dostačujícího odvodu třísek. Implementace automatických systému do číslicově řízeného obráběcího centra umožňuje zvýšení produktivity. Před automatizováním obráběcího procesu však musí být proces optimalizován. Zejména dostatečná fragmentace třísek a jejich evakuace jsou klíčové. Dlouhé nedělené třísky můžou poškodit systémy jako například automatický měnič nástrojů, dopravník třísek nebo průmyslového robota. Dostatečná lámavost třísek může být zaručena správným výběrem technologie a strategie obrábění, výběrem řezného nástroje a řezných podmínek pro daný materiál obrobku.
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Nguyen, Tony. "Trochoidal Milling of AlSiCp with CVD Diamond Coated End Mills." Scholarly Commons, 2018. https://scholarlycommons.pacific.edu/uop_etds/3128.

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Metal matrix composites have seen a rise in demand within the last decade. Aluminum alloy reinforced with silicon carbide particles is a type of particle metal matrix composite that has seen applications in the aerospace, ground transportation, and electronics industry. However, the abrasive SiC particles have made this material difficult to machine through conventional machining strategies. This research will focus on using computer aided manufacturing with trochoidal tool paths to maximize machining productivity and extend the tool life of CVD diamond coated end mills. The focus of this research will be on AlSiCp with a high volume fraction of reinforcement (30%) to expand the potential applications of this pMMC. The cutting experiments are divided into three parts: cutting test, confirmation test, and endurance test. Taguchi method will be used to perform an analysis of variance and signal-to-noise ratio to optimize a combination of material removal rate, average cutting forces, and surface roughness. The optimal cutting conditions were found to be 254 mm/min, 30°, and 9500 r/min for MRR+AvgFxy+Ra, 1524 mm/min, 30°, and 9500 r/min for MRR+AvgFxy, and 1524 mm/min, 90°, and 9500 r/min. The cutting conditions for MRR+AvgFx+Ra was not considered for the endurance tests as the machining productivity was too low to be considered a feasible option in the industry. It was concluded that trochoidal milling under wet cutting conditions produced nearly half the tool wear as previous research with conventional milling strategies. However, the longer the CVD diamond coated end mills were engaged in the AlSiCp workpiece, the more dominant the abrasive wear mechanisms appear and cause tool damage. It was concluded that square end mills may not be suitable for machining AlSiCp and that future research should focus on varying the tool geometry or utilizing ball end mills.
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Coombes, Matthew. "Landing site reachability and decision making for UAS forced landings." Thesis, Loughborough University, 2016. https://dspace.lboro.ac.uk/2134/21139.

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After a huge amount of success within the military, the benefits of the use of unmanned aerial systems over manned aircraft is obvious. They are becoming cheaper and their functions advancing to such a point that there is now a large drive for their use by civilian operators. However there are a number of significant challenges that are slowing their inevitable integration into the national airspace systems of countries. A large array of emergency situations will need to be dealt with autonomously by contingency management systems to prevent potentially deadly incidences. One such emergency situation that will need autonomous intervention, is the total loss of thrust from engine failure. The complex multi faceted task of landing the stricken aircraft at a potentially unprepared site is called a forced landing. This thesis presents methods to address a number of critical parts of a forced landing system for use by an unmanned aerial system. In order for an emergency landing site to be considered, it needs to be within glide range. In order to find a landing site s reachability from the point of engine failure the aircraft s glide performance and a glide path must be known. A method by which to calculate the glide performance, both from aircraft parameters or experiments is shown. These are based on a number of steady state assumptions to make them generic and quick to compute. Despite the assumptions, these are shown to have reasonable accuracy. A minimum height loss path to the landing site is defined, which takes account of a steady uniform wind. While this path is not the path to be flown it enables a measure of how reachable a landing site is, as any extra height the aircraft has once it gets to the site makes a site more reachable. It is shown that this method is fast enough to be run online and is generic enough for use on a range of aircraft. Based on identified factors that make a landing site more suitable, a multi criteria decision making Bayesian network is developed to decide upon which site a unmanned aircraft should land in. It can handle uncertainty and non-complete information while guaranteeing a fast reasonable decision, which is critical in this time sensitive situation. A high fidelity simulation environment and flight test platform are developed in order to test the performance of the developed algorithms. The test environments developed enable rapid prototyping of algorithms not just within the scope of this thesis, but on a range of vehicle types. In simulation the minimum height loss paths show good accuracy, for two completely different types of aircraft. The decision making algorithms show that they are capable of being ran online in a flight test. They make a reasonable decision and are capable of quickly reacting to changing conditions, enabling redirection to a more suitable landing site.
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Blažo, Marek. "Hnací ústrojí závodního Wankelova rotačního motoru." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2010. http://www.nusl.cz/ntk/nusl-229075.

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The main aim of master’s thesis was to handle the computing proposal and the construction design of the powertrain of racing Wankel rotary engine with 300 kW power output and in the case of 9000 speed per minute. On the basic of these values was made the primary design of the rotary engine, design of the eccentric shaft and rotor housing. Mechanical stress and torsional vibrations of the eccentric shaft were analyzed by using the course of indicator diagram.
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Mak, Yiu-ming, and 麥耀明. "The ecology of the high-zoned littorinids, Nodilittorina trochoides,N. radiata and N. vidua, on rocky shores in Hong Kong." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1996. http://hub.hku.hk/bib/B31236042.

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Books on the topic "Trochoids"

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Veitch, Brian J. Experimental results and theoretical predictions of trochoidal propeller performance. Ottawa: National Library of Canada, 1991.

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2

Binder, Brian Jeffrey. The physiology of dormancy and germination in cysts of the marine dinoflagellate Scrippsiella trochoidea. Woods Hole, Mass: Woods Hole Oceanographic Institution, 1986.

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Book chapters on the topic "Trochoids"

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Salleh, Noor Deenina Hj Mohd, and Somnuk Phon-Amnuaisuk. "Beautiful Trochoids." In Advances in Intelligent Systems and Computing, 171–80. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-13153-5_17.

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Ivanović, Lozica, Danica Josifović, and Andreja Ilić. "Modelling of Trochoidal Gearing at the Gerotor Pump." In Power Transmissions, 553–62. Dordrecht: Springer Netherlands, 2013. http://dx.doi.org/10.1007/978-94-007-6558-0_44.

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Ueda, Akio. "Tooth Surface Stress and Flash Temperature Analysis with Trochoid Interference of Gears." In New Approaches to Gear Design and Production, 239–60. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-34945-5_9.

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Jacso, A., Gy Matyasi, and T. Szalay. "Trochoidal Tool Path Planning Method for Slot Milling with Constant Cutter Engagement." In Lecture Notes in Mechanical Engineering, 659–68. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-33-4320-7_59.

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Terada, H., M. Kobayashi, and K. Imase. "Development of a Trochoidal Gear Reducer with a Slipping Rollers Type Torque Limiter." In New Advances in Mechanisms, Transmissions and Applications, 49–56. Dordrecht: Springer Netherlands, 2014. http://dx.doi.org/10.1007/978-94-007-7485-8_7.

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Si, Shuangshuang, Haiwei Wang, Lulu Li, and Geng Liu. "Analysis of Tooth Profile Influencing Factors and Meshing Characteristics for Trochoidal Roller Pinion Rack Transmissions." In Advances in Mechanical Design, 645–63. Singapore: Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-7381-8_42.

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"Cycloids and Trochoids." In New Horizons in Geometry, 31–64. Providence, Rhode Island: American Mathematical Society, 2013. http://dx.doi.org/10.5948/9781614442103.005.

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"trochoidal fault." In Dictionary Geotechnical Engineering/Wörterbuch GeoTechnik, 1433. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-41714-6_202870.

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"trochoidal wave." In Dictionary Geotechnical Engineering/Wörterbuch GeoTechnik, 1433. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-41714-6_202871.

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"trochoidal wave of maximum steepness." In Dictionary Geotechnical Engineering/Wörterbuch GeoTechnik, 1433. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-41714-6_202872.

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Conference papers on the topic "Trochoids"

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Schopferer, Simon, Julian Soren Lorenz, Azarakhsh Keipour, and Sebastian Scherer. "Path Planning for Unmanned Fixed-Wing Aircraft in Uncertain Wind Conditions Using Trochoids." In 2018 International Conference on Unmanned Aircraft Systems (ICUAS). IEEE, 2018. http://dx.doi.org/10.1109/icuas.2018.8453391.

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BRAKEZ, A., and A. MIR. "COMPUTATIONAL MODELING OF TROCHOIDAL PROPULSOR." In Proceedings of the 8th International Symposium on Flow Modeling and Turbulence Measurements. WORLD SCIENTIFIC, 2002. http://dx.doi.org/10.1142/9789812777591_0068.

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3

Ikejo, Kiyotaka, Kazuteru Nagamura, Eiichirou Tanaka, and Koji Yamamoto. "Driving Performance and Strength of Pin-Rack Gear Mechanism Using a Trochoid Tooth Profile." In ASME 2007 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/detc2007-34243.

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A pin-rack gear mechanism, which consists of a rack bar and a sprocket pinion, transforms a rotation motion into a liner one. The rack-bar has a series of pin train, and meshes with the sprocket pinion. In the previous study, we clarified the problem caused by using the sprocket pinion with an involute tooth profile. In this study, we adopted a trochoid tooth profile to the sprocket pinion of the pin-rack gear mechanism to obtain the higher strength. We measured the tooth root stress of the sprocket pinion with a trochoid tooth profile, the driving torque, and the horizontal force of the rack bar using a pin-rack gear mechanism testing machine. Additionally, we calculated the tooth root stress of sprocket pinion, the contact stress on the tooth surface, the flash temperature and the power loss. We considered on the driving performance and the strength of the pin-rack gear mechanism using a trochoid tooth profile by comparing the measured data with the calculated results.
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Li, Shuangqing, and John B. Shung. "Dynamic Analysis of Trochoidal-Type Machine." In ASME 1996 Design Engineering Technical Conferences and Computers in Engineering Conference. American Society of Mechanical Engineers, 1996. http://dx.doi.org/10.1115/96-detc/dac-1468.

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Abstract In a trochoidal-type machine, when the apex seals are replaced by tight running clearances between the rotor and chamber, the friction and wear can be eliminated and thus high efficiency and reliability can be obtained. There are many factors which contribute to the dynamic running clearances. The control of the vibration of the rotor-shaft system is important for the control of the running clearance. This paper studied the dynamics of the rotor-shaft system of a trochoidal-type machine without apex seal. The shaft is lumped as an equivalent system of a mass and a spring. The stiffness of the spring is determined by static equivalence of the two systems. In other words, when the same load is applied, the two systems should have the same displacement. The lumped mass is determined by the dynamic equivalence of the two systems. In other words, the natural frequency of the continuous system with expected mode is equal to the natural frequency of the lumped system. The bearings are modeled as distributed springs and dampers. The coefficients of the springs and dampers are obtained by solving the Reynolds’ equation. The established model can be used to predict the effect of the dynamics of the rotor-shaft system on the running clearances between the rotor and chamber.
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5

Nusinovich, G. S. "Cyclotron resonance masers with trochoidal electron beams." In International Conference on Plasma Science (papers in summary form only received). IEEE, 1995. http://dx.doi.org/10.1109/plasma.1995.533242.

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6

Pleta, Abram, Durul Ulutan, and Laine Mears. "Investigation of Trochoidal Milling in Nickel-Based Superalloy Inconel 738 and Comparison With End Milling." In ASME 2014 International Manufacturing Science and Engineering Conference collocated with the JSME 2014 International Conference on Materials and Processing and the 42nd North American Manufacturing Research Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/msec2014-4151.

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Nickel-based superalloys are designed for use in extreme environments and are getting progressively better for these environments, therefore much harder to machine. They play a crucial role in elevated temperature applications where high strength, high resistance to corrosion and creep resistance are required. Machinability suffers as a result of these properties and harsh machining conditions occur, resulting in high cutting forces and tool wear. To combat the difficulties in the machining of nickel-based superalloys, such as poor thermal diffusivity and high levels of abrasive wear, trochoidal milling was introduced as an alternative method of milling. This method of milling combines linear motion with uniform circular motion, reducing chip load in exchange for increased machining time. Industry is averse to its widespread adoption due to increasing cycle times when compared to conventional milling methods, however it has been shown that overall productivity can be improved due to less tool wear with a more predictable behavior. This work characterizes the effects of trochoidal milling and provides a comparison of trochoidal milling with a traditional milling technique, end milling, for the machining of Inconel 738. In order to compare the trochoidal and conventional machining approaches directly, metrics of productivity normalized to tool wear are introduced. The normalized metrics introduced in this study aim to provide a more representative comparison of productivity and efficiency characteristics: volumetric material removal per unit tool wear (MR/VB) and the material removal rate per unit tool wear (MRR/VB). It was found that significantly higher volumetric material removal is possible using trochoidal milling, and fewer tools are needed; material removal rates that competitive with end milling can be achieved. When the amount of time spent on tool change for the same volume of material removal is considered, material removal rate of trochoidal milling can even be higher than end milling, indicating that better productivity and efficiency of the process is possible at reduced tooling costs.
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Yılmaz, Tufan Gurkan, Oguz Dogan, and Fatih Karpat. "Stress Analysis of Thin Rimmed Spur Gear with Asymmetric Trochoid." In The 3rd World Congress on Mechanical, Chemical, and Material Engineering. Avestia Publishing, 2017. http://dx.doi.org/10.11159/icmie17.132.

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Li, Shuangqing, John B. Shung, and Randall F. Barron. "Vibration of the Rotor Shell in a Trochoidal-Type Machine Without Apex Seals." In ASME 1998 Design Engineering Technical Conferences. American Society of Mechanical Engineers, 1998. http://dx.doi.org/10.1115/detc98/dac-5590.

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Abstract The natural frequencies and dynamic response of a trochoidal cylindrical shell in a trochoidal-type machine are studied. Both analytical method and finite element method (FEM) solutions are obtained. The mode shapes obtained by the two approaches match quite well. The model established can be applied to control the running clearance between rotor and chamber in this type of machine, which is critical to the performance of the machine.
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Gamez-Montero, P. J., R. Castilla, A. Buza, M. Khamashta, and E. Codina. "Numerical Study in a Mini Trochoidal-Gear Pump With Multi-Meshing Contact Points." In BATH/ASME 2016 Symposium on Fluid Power and Motion Control. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/fpmc2016-1723.

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A numerical study in a mini trochoidal-gear pump based on an ingenious strategy to adapt the background mesh to the profiles shape and a new boundary condition is presented. The strategy achieves a final background mesh better adapted to the geometries and, additionally, the cells are more homogenous and less distorted when the trochodial-profiles are moved. The new boundary condition to simulate the multi-meshing contact points is applied at every time step by means of the viscous wall approach, a home-made ad-hoc code, which has been integrated in an OpenFOAM solver that also includes the dynamic mesh functionality by deforming the mesh following the trochoidal-gear rotation. The presented numerical study establishes the basis that will allow simulating more realistic aspects of a new design of a mini trochoidal-gear pump once the need for a continuous fluid domain is overcome reproducing actual contacts between the rotors and will guide to a better understanding of the new design.
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Lychuk, W. M., S. A. Bradley, C. R. Vilmann, C. E. Passerello, and Chi-Ming Lee. "Stress and Deformation Modeling of Multiple Rotary Combustion Engine Trochoid Housings." In SAE International Congress and Exposition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 1986. http://dx.doi.org/10.4271/860614.

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