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Dissertations / Theses on the topic 'Machine Engineering (General)'

Author: Grafiati

Published: 4 June 2021

Last updated: 27 July 2025

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1

Myers, Alan. "The effect of concrete foundations and machine thermal conditions on the accuracy of large machine tools." Thesis, University of Huddersfield, 2017. http://eprints.hud.ac.uk/id/eprint/34454/.

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This thesis comprises of eighteen publications which describe research work which has been carried out into two aspects regarding the accuracy of large machine tools. The first six papers discuss the concrete foundations on which the machines are supported and the remaining twelve papers describe the consequences of thermal effects on machines. The publications are all ones of joint authorship, with the candidate being one of the named authors. Manufacturing industry and the precision requirements of large machine tools: The thesis reviews the range of errors and their causes that effect large

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2

Choudhury, A. "Fast machine learning algorithms for large data." Thesis, University of Southampton, 2002. https://eprints.soton.ac.uk/45907/.

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Traditional machine learning has been largely concerned with developing techniques for small or modestly sized datasets. These techniques fail to scale up well for large data problems, a situation becoming increasingly common in today’s world. This thesis is concerned with the problem of learning with large data. In particular, it considers solving the three basic tasks in machine learning, viz., classification, regression and density approximation. We develop fast memory- efficient algorithmics for kernel machine training and deployment. These include considering efficient preprocessing steps

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3

Sztendel, Sebastian. "Model referenced condition monitoring of high performance CNC machine tools." Thesis, University of Huddersfield, 2016. http://eprints.hud.ac.uk/id/eprint/34112/.

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Generally, machine tool monitoring is the prediction of the system’s health based on signal acquisition and processing and classification in order to identify the causes of the problem. The producers of machine tools need to pay more attention to their products life cycle because their customers increasingly focus on machine tool reliability and costs. The present study is concerned with the development of a condition monitoring system for high speed Computer Numerical Control (CNC) milling machine tools. A model is a simplification of a real machine to visualize the dynamics of a mechatronic

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4

Postlethwaite, Scott R. "Electronic based accuracy enhancement of CNC machine tools." Thesis, University of Huddersfield, 1992. http://eprints.hud.ac.uk/id/eprint/4663/.

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The need for better machine tool accuracy is discussed together with the factors which can affect machine tool accuracy. A study is made of the various techniques adopted for the reduction of errors in machine tools. The concept of error compensation is discussed and the different techniques for error compensation are appraised. A critical appraisal is presented of the work undertaken to date in the field of error compensation. Based on this appraisal a criterion is established for a universally applicable error compensation system. The development of a novel, patented microprocessor based mac

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5

Abuaniza, Ayman. "Thermal parameter optimisation for accurate finite element based on simulation of machine tools." Thesis, University of Huddersfield, 2015. http://eprints.hud.ac.uk/id/eprint/28318/.

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The need for high-speed/high-precision machine tools is swiftly increasing in response to the growth of production technology that necessitates high- recision parts and high productivity. The influence of thermally induced errors in machine tools can have a much greater influence on the dimensional tolerances of the final products produced as compared to geometric and cutting force errors. Therefore, to maintain high accuracy of machine tool, it requires an accurate method of thermal error control or compensation using a detailed model. The thermal errors of machine tools are induced by the pr

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6

Chi, Yuan. "Machine learning techniques for high dimensional data." Thesis, University of Liverpool, 2015. http://livrepository.liverpool.ac.uk/2033319/.

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This thesis presents data processing techniques for three different but related application areas: embedding learning for classification, fusion of low bit depth images and 3D reconstruction from 2D images. For embedding learning for classification, a novel manifold embedding method is proposed for the automated processing of large, varied data sets. The method is based on binary classification, where the embeddings are constructed so as to determine one or more unique features for each class individually from a given dataset. The proposed method is applied to examples of multiclass classifica

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7

Potdar, Akshay Anand. "Reducing the uncertainty of thermal model calibration using on-machine probing and data fusion." Thesis, University of Huddersfield, 2016. http://eprints.hud.ac.uk/id/eprint/31397/.

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Various sources of error hinder the possibility of achieving tight accuracy requirements for high-value manufacturing processes. These are often classified as: pseudo-static geometric errors; non-rigid body errors; thermal errors; and dynamic errors. It is comparatively complicated to obtain an accurate error map for the thermal errors because they are influenced by various factors with different materials, time constants, asymmetric heating sources and machining process, environmental effects, etc. Their transient nature and complex interaction mean that they are relatively difficult to compe

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8

Kaloskampis, Ioannis. "Recognition of complex human activities in multimedia streams using machine learning and computer vision." Thesis, Cardiff University, 2013. http://orca.cf.ac.uk/59377/.

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Modelling human activities observed in multimedia streams as temporal sequences of their constituent actions has been the object of much research effort in recent years. However, most of this work concentrates on tasks where the action vocabulary is relatively small and/or each activity can be performed in a limited number of ways. In this Thesis, a novel and robust framework for modelling and analysing composite, prolonged activities arising in tasks which can be effectively executed in a variety of ways is proposed. Additionally, the proposed framework is designed to handle cognitive tasks,

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9

Grap, Marie Belen. "A Hybrid Approach to General Information Extraction." DigitalCommons@CalPoly, 2015. https://digitalcommons.calpoly.edu/theses/1474.

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Information Extraction (IE) is the process of analyzing documents and identifying desired pieces of information within them. Many IE systems have been developed over the last couple of decades, but there is still room for improvement as IE remains an open problem for researchers. This work discusses the development of a hybrid IE system that attempts to combine the strengths of rule-based and statistical IE systems while avoiding their unique pitfalls in order to achieve high performance for any type of information on any type of document. Test results show that this system operates competitiv

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10

Williamson, James. "Dispersed reference interferometry for on-machine metrology." Thesis, University of Huddersfield, 2016. http://eprints.hud.ac.uk/id/eprint/31554/.

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The reliance of emerging engineering and scientific applications on nanometre scale surfaces has led to the requirement for embedded metrology instrumentation for on-machine measurement in precision and ultra-precision manufacturing processes. In-situ measurement provides reduction in waste, cost and production cycle time of manufactured components however the presence of environmental noise and difficulties of integration make embedded metrology challenging. In this thesis a review of on-machine methods of optical metrology is provided and commercially available instruments are summarised. Th

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11

Suleiman, Aminu. "Multivariate study of vehicle exhaust particles using machine learning and statistical techniques." Thesis, University of Birmingham, 2016. http://etheses.bham.ac.uk//id/eprint/6945/.

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This research has examined the application of machine learning and statistical methods for developing roadside particle (number/mass concentrations) prediction models that can be used for air quality management. Data collected from continuous monitoring stations including pollutants, traffic and meteorological variables were used for training the models. A hybrid feature selection method involving Genetic Algorithms and Random Forests was successfully used in selecting the most relevant predictor variables for the models from the variables selected based on their correlation with the PM\(_+\),

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12

Smith, Concetta. "A manual for developing and implementing an AS9100 certified quality management system for small machine shops." Thesis, California State University, Dominguez Hills, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=1526312.

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<p> Manufacturers, specifically small machine shops, find it difficult to compete with the capabilities of large manufacturers. If these small shops are not certified to a recognized standard such as AS9100, sales become even harder.</p><p> Small businesses need assistance in understanding and achieving the certifications requirements for a quality management system (QMS), which requires management's commitment and total buy-in for a proper implementation plan that involves the entire staff.</p><p> The objective of this project is to develop a quality manual that outlines the total process

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13

Holmgren, Viktor. "General-purpose maintenance planning using deep reinforcement learning and Monte Carlo tree search." Thesis, Linköpings universitet, Artificiell intelligens och integrerade datorsystem, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-163866.

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Maintenance planning and execution is increasingly important for the modern industrial sector. Maintenance costs can amount to a major part of industrial spending. However, it is not as simple as just reducing maintenance budgets. A balance must be struck between risking unplanned downtime and the costs of maintenance efforts, in order to keep the profit margins needed to compete in the global markets of today. One approach to improve the effectiveness of industries is to apply intelligent maintenance planners. In this thesis, a general-purpose maintenance planner based on Monte-Carlotree sear

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14

Mian, Naeem S. "Efficient machine tool thermal error modelling strategy for accurate offline assessment." Thesis, University of Huddersfield, 2010. http://eprints.hud.ac.uk/id/eprint/11054/.

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The requirement for improved dimensional accuracy to achieve ever tightening tolerances in manufactured parts increases the need for high precision machine tools. Machine tool accuracy is affected by various errors from which thermal errors have been identified as one of the largest contributors. These are primarily caused by heat generated by the machine as it operates and exogenous influences, mainly in the form of varying environmental temperature, that result in deformation of the machine structure. There is a complex interaction between the structural components having different heat sour

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15

Holroyd, Geoffrey. "The modelling and correction of ball-screw geometric, thermal and load errors on CNC machine tools." Thesis, University of Huddersfield, 2007. http://eprints.hud.ac.uk/id/eprint/2627/.

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In the modern global economy, there is a demand for high precision in manufacture as competitive pressures drive businesses to seek greater productivity. This results in a demand for a reduction in the errors associated with CNC machine tools. To this end, it is useful to develop a greater understanding of the mechanisms which give rise to errors in machine tool drives. This programme of research covers the geometric, thermal and load errors commonly encountered on CNC machine tools. Several mathematical models have been developed or extended which enable a deeper understanding of the interact

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16

Singh, Satyendra. "A study of the relationship between market orientation and business performance with particular reference to the machine tool industry based in the UK." Thesis, Southampton Solent University, 1998. http://ssudl.solent.ac.uk/829/.

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During the last decade, a subject which has captivated the attention of marketing and strategy researchers is the concept of market orientation. This thesis examines empirically, the relationship between market orientation and business performance in the context of the machine tool industry based in the UK. A more comprehensive market orientation scale was redeveloped by conducting comparative analysis of three previously developed market orientation scales with a view to make it an industry specific measure. The unit of analysis used in the study is at individual firm level. In the analysis,

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17

Sozak, Ahmet. "Uncertainty Analysis Of Coordinate Measuring Machine (cmm) Measurements." Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/2/12608887/index.pdf.

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In this thesis, the measurement uncertainty of Coordinate Measuring Machine (CMM) is analysed and software is designed to simulate this. Analysis begins with the inspection of the measurement process and structure of the CMMs. After that, error sources are defined with respect to their effects on the measurement and then an error model is constructed to compensate these effects. In other words, systematic part of geometric, kinematic and thermal errors are compensated with error modelling. Kinematic and geometric error model is specific for the structure of CMM under inspection. Also, a common

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18

BINDER, THOMAS. "Gland Segmentation with Convolutional Neural Networks : Validity of Stroma Segmentation as a General Approach." Thesis, KTH, Skolan för kemi, bioteknologi och hälsa (CBH), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-246134.

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The analysis of glandular morphology within histopathology images is a crucial step in determining the stage of cancer. Manual annotation is a very laborious task. It is time consuming and suffers from the subjectivity of the specialists that label the glands. One of the aims of computational pathology is developing tools to automate gland segmentation. Such an algorithm would improve the efficiency of cancer diag- nosis. This is a complex task as there is a large variability in glandular morphologies and staining techniques. So far, specialised models have given promising results focusing on

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19

Sweidan, Dirar. "A General Framework for Discovering Multiple Data Groupings." Thesis, Högskolan i Halmstad, Akademin för informationsteknologi, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-38047.

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Clustering helps users gain insights from their data by discovering hidden structures in an unsupervised way. Unlike classification tasks that are evaluated using well-defined target labels, clustering is an intrinsically subjective task as it depends on the interpretation, need and interest of users. In many real-world applications, multiple meaningful clusterings can be hidden in the data, and different users are interested in exploring different perspectives and use cases of this same data. Despite this, most existing clustering techniques only attempt to produce a single clustering of the

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20

Erden, Mustafa Suphi. "Six-legged Walking Machine: The Robot-ea308." Phd thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/12607356/index.pdf.

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The work presented in this thesis aims to make contribution to the understanding and application of six-legged statically stable walking machines in both theoretical and practical levels. In this thesis five pieces of work, performed with and for the three-joint six-legged Robot-EA308, are presented: 1) Standard gaits, which include the well-known wave gaits, are defined and a stability analysis, in the sense of static stable walking, is performed on an analytical level. Various definitions are given<br>theorems are stated and proved. 2) A free gait generation algorithm with reinforcement lear

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21

Kilic, Ergin. "Novel Position Measurement And Estimation Methods For Cnc Machine Systems." Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/2/12608762/index.pdf.

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Precision control of translational motion is vital for many CNC machine tools as the motion of the machinery affects the dimensional tolerance of the manufactured goods. However, the direct measurement along with the accurate motion control of machine usually requires relatively expensive sensors i.e. potentiometers, linear scales, laser interferometers. Hence, this study attempts to develop reference models utilizing low-cost sensors (i.e. rotary encoders) for accurate position estimation. First, an indirect measurement performance is investigated on a Timing Belt driven carriage by a DC Moto

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22

Heyder, Jakob. "Hierarchical Temporal Memory Software Agent : In the light of general artificial intelligence criteria." Thesis, Linnéuniversitetet, Institutionen för datavetenskap och medieteknik (DM), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-75868.

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Artificial general intelligence is not well defined, but attempts such as the recent listof “Ingredients for building machines that think and learn like humans” are a startingpoint for building a system considered as such [1]. Numenta is attempting to lead thenew era of machine intelligence with their research to re-engineer principles of theneocortex. It is to be explored how the ingredients are in line with the design princi-ples of their algorithms. Inspired by Deep Minds commentary about an autonomy-ingredient, this project created a combination of Numentas Hierarchical TemporalMemory theo

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23

Di, Croce Lorenzo. "Avionic retrofit of a Piper PA-32R-300: design of the human machine interface for glass cockpit avionic conversion." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2017.

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This thesis was developed in the framework of a six months, two people project that aimed at designing a Glass Cockpit Avionic Retrofit of a single engine general aviation aircraft. The project was divided in two main work packages, one related to the aircraft systems analysis and modifications, and the other related to the Human Machine Interface improvements. This thesis will be focused on the latter. The report describes the method that was implemented to perform the Avionic Retrofit of a Piper PA-32R-300. The document is divided into three main parts where the general flowchart is present

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24

Lenzi, Arcanjo. "The use of damping material in industrial machines." Thesis, University of Southampton, 1985. https://eprints.soton.ac.uk/52157/.

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25

Kirecci, Ali. "Motion design for high speed machines." Thesis, Liverpool John Moores University, 1993. http://researchonline.ljmu.ac.uk/4937/.

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The dynamic performance of a programmable manipulator depends on both the motion profile to be followed and the feedback control method used. To improve this performance the manipulator trajectory requires planning at an advanced level and an efficient control method has to be used. The purpose of this study is to investigate high-level trajectory planning and trajectory tracing problems. It is shown that conventional trajectory planning methods where the motion curves are generated using standard mathematical functions are ineffective for general application especially when velocity and accel

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Murray, James W. H. "Damage, contamination and surface treatment of electrical discharge machined materials." Thesis, University of Nottingham, 2014. http://eprints.nottingham.ac.uk/14226/.

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Electrical discharge machining (EDM) is a manufacturing process capable of machining electrically conductive materials regardless of their mechanical properties. It finds extensive usage across the aerospace, automotive, medical implant and mould/die industries, and is particularly useful for the micro-machining of precision components with complicated shapes. The surface integrity of materials machined by EDM is typically poor, and reduced service life is often expected as a result of surface properties. For example, reduced fatigue performance can result due to the presence of surface cracks

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27

Wolfer, Scott. "Design and Analysis of A General-Purpose Planetary Gear Durability Test Machie." The Ohio State University, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=osu1409148817.

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28

Shaeboub, Abdulkarim. "The monitoring of induction machines using electrical signals from the variable speed drive." Thesis, University of Huddersfield, 2018. http://eprints.hud.ac.uk/id/eprint/34555/.

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Induction motors are the most widely used industrial prime movers, mainly because of their simple yet powerful construction, ergonomic adaptability, rugged and highly robust structure combined with high reliability. However, under extreme and complex operations, such motors are subject to premature faults, which can be more significant when variable speed drive (VSDs) are used, due to the presence of more voltage harmonics, spikes and increases in operating temperature. In addition, VSD based systems also cause more noise in measured instantaneous current signals. These make it more difficult

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29

Johnson, Anthony. "Sustainability - its incorporation into the mechanical engineering design process." Thesis, University of Huddersfield, 2014. http://eprints.hud.ac.uk/id/eprint/24275/.

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As an engineering design practitioner both as an educator as well as a practicing design consultant it became clear that there was a need for a sustainability measurement tool for the mechanical engineering product designer who actually designs products, that is, the engineer who drives the Computer Aided Design (CAD) station. This need was confirmed upon consulting several publications but in particular the codes of practice of the Institution of Mechanical Engineers, (I.Mech.E.) [A1.1], American Society of Mechanical Engineers (ASME) [A1.2], and The Royal Society of Engineers (RSoC) [A1.3],

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30

Kovacevic, Ahmed. "Three dimensional numerical analysis for flow prediction in positive displacement screw machines." Thesis, City University London, 2002. http://openaccess.city.ac.uk/7604/.

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A substantial proportion of all industrial compressors now produced are of the twin-screw type. These are rotary positive displacement machines, which operate at high efficiency over a wide range of speeds and pressure differences. Currently their performance is estimated by assuming simplified one-dimensional flow through passages with dimensions that are invariant with temperature and pressure. As manufacturing accuracy increases, clearances can be reduced and compressors thereby made smaller and more efficient. However to obtain full advantageo f this at the design stage,it must be possible

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31

Al-Ghamdi, Khalid A. "Improving the practice of experimental design in manufacturing engineering." Thesis, University of Birmingham, 2011. http://etheses.bham.ac.uk//id/eprint/3133/.

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Design of Experiments (DOE) is a powerful technique for understanding, characterising and modelling products and processes and improving their performance. Whilst the bulk of its literature revolves around how it should be applied, little attention, if any, is devoted to the manner in which it is being implemented in practice particularly in manufacturing. One objective of this study was to bridge this gap by reviewing practical applications in three manufacturing journals. This revealed not only limited use but also multiple deficiencies. Many of these concerned a lack of familiarity with the

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32

Aldawi, Fouad Juma. "A low-cost ultrasonic 3D measurement device for calibration of Cartesian and non-Cartesian machines." Thesis, University of Huddersfield, 2009. http://eprints.hud.ac.uk/id/eprint/9106/.

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The major obstacles to the widespread adoption of 3D measurement systems are accuracy, speed of process and the cost. At present, high accuracy for measuring 3D position has been achieved, and there have been real advances in reducing measurement time, but the cost of such systems remains high. A high-accuracy and high-resolution ultrasonic distance measurement system has been achieved in this project by creating multi-frequency continuous wave frequency modulation (MFCWFM) system. The low-cost system measures dynamic distance (displacements of an ultrasound transmitter) and fixed distance (di

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33

Hartono, Dennis. "Development of time-frequency analysis for extraction of dynamic characteristics for rotating machinery and bridge structures." Thesis, University of Nottingham, 2018. http://eprints.nottingham.ac.uk/52358/.

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This work is aimed at developing a new signal processing technology based on time-frequency analysis to extract the dynamic characteristics of rotating machinery and bridge structure. Therefore, the work can be divided into two parts, the condition monitoring of the gearbox and the structural health monitoring of the bridges. The first part of the work aims: (i) to propose a Joint Time-Frequency Analysis (JTFA) method for gear fault diagnosis by using the combined autoregressive (AR) model-based filtering and Reassigned Smoothed Pseudo Wigner-Ville Distribution (RSPWVD) methods; (ii) to invest

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El, Musleh Mohammad. "Transformation of UML State Machine Diagram into Graph Database to Generate Test Cases." Thesis, Uppsala universitet, Institutionen för informationsteknologi, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-426060.

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The manual approach in software testing is considered as expensive, error-prone, and time-consuming activity since it depends highly on the test engineers. As well, the process of software testing requires proper planning and resources to design the test cases. For this reason, any approach that can be used to enhance or automate the current testing process is necessary. This thesis introduces an approach to transform the Unified Modeling Language (UML) behavioral state machines diagram into a graph database inside Neo4j, a graph database software. Moreover, a framework is proposed that fetche

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Biglarifadafan, Ali. "A general hybrid force-based method for structural analysis." Thesis, University of Glasgow, 2014. http://theses.gla.ac.uk/5266/.

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The form of the energy function (i.e. Total, Hellinger-Reissner, Hu-Washizu or Complementary energy functions) has a significant influence on FEM performance. Motivated by the ability of the force-based method to satisfy the equilibrium equation and ability of the displacement-based method to satisfy compatibility equation, this thesis proposes a mathematical framework, namely the ‘Hybrid Force-Based Method’ which employs two physical concepts; the Total and Complementary Potential Energy functions. Satisfaction of both the Total and Complementary Potential Energy function is critical to the s

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Shin, Joong-Ho. "An iterative transfer matrix approach to the kineto-elasto static and dynamic analyses of general planar flexible mechanisms /." The Ohio State University, 1986. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487265143148732.

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Meng, Xuan. "Numerical analysis of a fluid droplet subject to acoustic waves." Thesis, University of Glasgow, 2018. http://theses.gla.ac.uk/30957/.

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Efficient and rigorous acoustic solvers that enable high frequency sweep application over a wide range of frequencies are of great interest due to their practical importance in many engineering, physical problems or life science research that involve acoustic radiation, such as engine noise analysis, acoustic simulation in micro-fluidics and the design of lab device, etc. There is room for reduction of cost on experimental systems that can be investigated and optimised through numerical modelling of physical processes on the micro-scale level. The major difficulty that arises is the inconsiste

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Armstrong, Keith Bernard. "The selection of adhesives and composite matrix resins for aircraft repairs." Thesis, City, University of London, 1990. http://openaccess.city.ac.uk/18929/.

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This Thesis studies various aspects of the selection of adhesives for aircraft repairs. It was undertaken because of the need to repair a number of different aircraft types with a limited range of adhesives to minimise stockholdings and wastage of materials which have shelf-life limitations. The aspects studied were tensile strength, tensile modulus, elongation at failure, fracture energy, compression strength, compression modulus, water uptake, Tg dry and we t and diffusion coefficient. A computer programme written at Leicester Polytechnic was adapted to suit an IBM PC and this allowed water

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39

Crowther, David Neville. "The hot ductility of steels." Thesis, City, University of London, 1986. http://openaccess.city.ac.uk/19368/.

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Hot tensile tests have been performed on a variety of plain carbon and micro-alloyed steels, in order to determine the influence of such factors as phase transformation, grain size and precipitation on hot ductility. The γ-∝ phase transformation has been shown to produce a significant ductility trough in the high temperature tensile behaviour of plain C steels, and factors which alter the A3 temperature, such as cooling rate and C content, have been shown to produce a change in the temperature at which the ductility trough occurs. This ductility trough is due to strain concentration in the fer

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Carruthers-Watt, Benjamin. "Strip tracking in hot strip mills." Thesis, Cardiff University, 2011. http://orca.cf.ac.uk/35793/.

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In the finishing mill, steel strip is rolled from thick slabs through pairs of rollers housed in a continuous train of seven roll stands. As the strip is rolled, unwanted lateral movement, known as strip tracking, can cause the strip to collide with the edge of the mill. Strip tracking control is currently a manual operation, relying on the skill of the operators. When tracking is observed, the stand tilt is adjusted asymmetrically, causing a camber in the strip, steering it towards the centreline. Tracking control can be automated if a reliable measurement of position is available. A vision-b

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Jebur, Qusai Hatem. "Characterisation and modelling of transversely isotropic flexible viscoelastic foam." Thesis, University of Glasgow, 2013. http://theses.gla.ac.uk/4497/.

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Polymer foams have unique properties covering a wide range of mechanical and physical behaviours. This makes them important engineering materials that can be used in numerous applications including packaging, impact energy absorption, cushioning and spacers in sandwich construction. In general, the mechanical response of foam materials is not isotropic, though for most design purposes they are treated as such. The validity of this assumption depends on the degree of anisotropy of the foam and in some cases may be questionable. Most polymeric foams tend to display at least some degree of anisot

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Sadeghioon, Ali Mollazadeh. "Design and development of wireless underground sensor networks for pipeline monitoring." Thesis, University of Birmingham, 2015. http://etheses.bham.ac.uk//id/eprint/5947/.

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Infrastructure monitoring, and specifically pipeline monitoring (e.g. water supply systems), is becoming crucial in order to achieve improved asset management and a more sustainable future. However, different drawbacks in existing methods of monitoring have prevented them from being widely used on water distribution systems. In this research a comprehensive review of the current state-of-the-art in pipeline monitoring is presented and the advantages and disadvantages of each of these methods are discussed in detail. An ultra-low power Wireless Underground Sensor Network (WUSN) has been careful

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Liu, Huaiju. "Lubricated contact analysis of a spur gear pair with dynamic loads." Thesis, University of Warwick, 2013. http://wrap.warwick.ac.uk/57917/.

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In the present research study, a comprehensive spur gear lubrication analysis has been carried out to understand the gear contact behaviour under lubrication conditions. The modelling works have been extended to consider the effects of thermal mechanical, non-Newtonian fluid, surface roughness, transient squeeze and dynamic load conditions. First, the elastohydrodynamic lubrication theory is studied and relevant numerical approaches are introduced. The reduced Reynolds equation technique is applied to deal with any potential "asperity contacts" or any other ultra-thin film situations. Those si

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Li, Ji. "A study of the solid particle erosion performance of automative and other novel low carbon steels." Thesis, University of Greenwich, 2007. http://gala.gre.ac.uk/8534/.

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Chen, Ching-Hsien. "Tools for developing continuous-flow micro-mixer : numerical simulation of transitional flow in micro geometries and a quantitative technique for extracting dynamic information from micro-bubble images." Thesis, University of Warwick, 2013. http://wrap.warwick.ac.uk/57599/.

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Recent advance in the microfluidics including its fabrication technologies has led to many novel applications in micro-scale flows. Among them is the continuous-flow micromixer that utilizes the advantages associated with turbulent flows for rapid mixing, achieving the detection of fast kinetic reaction as short as tens of microseconds. However, for developing a high performance continuous-flow micromixer there are certain fundamental issues need to be solved. One of them is an universal simulation approach capable of calculating the flow field across entire passage for entire regime from very

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Song, Guangming. "An application of computer aided design and computer aided draughting techniques to gearing." Thesis, City, University of London, 1988. http://openaccess.city.ac.uk/19505/.

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The thesis describes the development of a computer-aided design and computer-aided draughting package of industrial gearboxes for transmitting power between shafts having parallel major axes. The package mainly consists of the following functions: (a) Determination of gear tooth numbers from the properties of continued and conjugate fractions (b) Generation of gear teeth by a rack-type cutter (c) Calculation of gear tooth profile and production of gear tooth grid for finite element stress analysis (d) Detailed strength analysis and design of a spur or helical, external or internal, standard or

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Rothwell, Glynn. "Fracture toughness determination using constraint enhanced sub-sized specimens." Thesis, Liverpool John Moores University, 2003. http://researchonline.ljmu.ac.uk/4971/.

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Wu, Hui. "Investigation of fluid flow in grinding using LDA techniques and CFD simulation." Thesis, Liverpool John Moores University, 2009. http://researchonline.ljmu.ac.uk/5944/.

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This research aimed to establish the requirements for effective fluid flow in grinding and to improve the efficiency of the fluid delivery system (fluid delivery optimization). Highly efficient fluid delivery will lower grinding temperatures, reduce the risk of thermal damage and reduce wheel wear. The thesis describes the work completed in the investigation of the complex fluid flow that occurs in the region close to the grinding contact zone between the wheel and workpiece and the boundary layer phenomena around the periphery of the rotating grinding wheel. Studies on air scraper and shoe no

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Al, Sa'd Mohammad Saleh. "A real-time multi-sensor 3D surface shape measurement system using fringe analysis." Thesis, Liverpool John Moores University, 2011. http://researchonline.ljmu.ac.uk/6011/.

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This thesis presents a state-of-the-art multi-sensor, 3D surface shape measurement system that is based upon fringe projection/analysis and which operates at speeds approaching real-time. The research programme was carried out as part of MEGURATH (www.megurath.org), a collaborative research project with the aim of improving the treatment of cancer by radiotherapy. The aim of this research programme was to develop a real-time, multi-sensor 3D surface shape measurement system that is based on fringe analysis, which provides the flexibility to choose from amongst several different fringe profilom

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Baines-Jones, Vadim Alexis. "Nozzle design for improved useful fluid flow in grinding." Thesis, Liverpool John Moores University, 2010. http://researchonline.ljmu.ac.uk/5929/.

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