Mechanical & Manufacturing Eng (Theses and Dissertations): Recent submissions
Now showing items 101-120 of 244
-
A new technique for vortex methods in computational fluid dynamics
(Trinity College (Dublin, Ireland). Department of Mechanical and Manufacturing Engineering, 2002)The random vortex method is a Lagrangian technique which involves solving the stream function-vorticity formulation of the Navier-Stokes equations. Discrete vortex particles, which are created at the surface to satisfy ... -
Temporomandibular joint injuries during whiplash
(Trinity College (Dublin, Ireland). Department of Mechanical and Manufacturing Engineering, 2000)Whiplash injuries occur due to differential accelerations in the human body. Neck injuries are predominant, but a considerable body of clinical evidence suggesting a close relationship between whiplash and temporomandibular ... -
Numerical vibro/acoustic analysis at higher frequencies
(Trinity College (Dublin, Ireland). Department of Mechanical and Manufacturing Engineering, 2003)Accurate modelling of steady-state acoustic and elastic wave phenom ena at higher frequencies, represents a major challenge for current numerical tools. Due to the large amount of computational effort and memory resources ... -
Finite element simulation of a metal forming process & die design
(Trinity College (Dublin, Ireland). Department of Mechanical and Manufacturing Engineering, 2000)Thread Rolling (also known as roll threading) is a cold forming process for producing threads or other helical or annular forms on a fastener. This is achieved by rolling the surface profile of hardened steel dies onto the ... -
Metal spinning, an incremental forming process
(Trinity College (Dublin, Ireland). Department of Mechanical and Manufacturing Engineering, 2003)Recent changes in product development processes have increased the demand for sheet metal parts manufactured in low volumes with the minimum investment in tooling. Spinning and a related process called 'incremental stretch ... -
Microcracks and the fatigue behaviour of compact bone
(Trinity College (Dublin, Ireland). Department of Mechanical and Manufacturing Engineering, 2001)Microcracking in bone acts as a stimulus for bone remodelling, contributes to the loss of bone quality in osteoporosis and is thought to play a major role in both fragility and stress fractures. This study seeks to refine ... -
Investigating the load, friction and sealability characteristics of graphite valve packings
(Trinity College (Dublin, Ireland). Department of Mechanical and Manufacturing Engineering, 2005)It is widely accepted that valve stem leakage accounts for the majority of fugitive emissions from petrochemical and chemical sites often accounting for over 50% of fugitive emissions from these sites. The most common valve ... -
Hypothesis testing of glenoid component innovation in total shoulder arthroplasty
(Trinity College (Dublin, Ireland). Department of Mechanical and Manufacturing Engineering, 2003)A glenoid component with reliable long-term performance does not exist for total shoulder arthroplasty. Poor glenoid component durability may be explained by the huge variability that exists at the shoulder joint ... -
Biomechanical origins of osteoporosis
(Trinity College (Dublin, Ireland). Department of Mechanical and Manufacturing Engineering, 2004)The contention of this thesis is that a pathological change in bone tissue material properties during osteoporosis ahers the mechanical stimuli to bone remodelling cells and drives them to adapt the trabecular architecture ... -
Design and development of a pre-clinical test for cemented femoral hip replacements
(Trinity College (Dublin, Ireland). Department of Mechanical and Manufacturing Engineering, 2000)Current state of the art testing methods do not allow implant performance to be assessed relative to known failure modes, prior to clinical use. Even clinically, it can take up to 5 years before implant performance can be ... -
An experimental and numerical investigation into the machining of Inconel 718 using coated cemented carbide cutting tools
(Trinity College (Dublin, Ireland). Department of Mechanical and Manufacturing Engineering, 2000)The nickel-base superalloy Inconel 718, a tough material capable of maintaining its strength at high temperatures and resisting corrosion in various environments, can be classified as a "difficult to machine" material. Yet ... -
Finite element analysis & Die profile optimisation for a cold forging process
(Trinity College (Dublin, Ireland). Department of Mechanical and Manufacturing Engineering, 2001)Throughout the world, almost every machine that moves requires the use of bolts in one form or another. Bolts, or Fasteners, are made in bolt making machines by a process of cold forming. At a particular stage in the bolt ... -
A stochastic model of damage accumulation in acrylic bone cement : application to failure modelling of cemented hip replacement
(Trinity College (Dublin, Ireland). Department of Mechanical and Manufacturing Engineering, 2003)Acrylic bone cement, used to fixate several forms of orthopaedic joint replacement prosthesis, has a variable fatigue resistance arising mainly from porosity. It is argued that deterministic modelling assumptions of ... -
Adaptation of growing bone to altered mechanical load : morphological change, structural strength and gene expression
(Trinity College (Dublin, Ireland). Department of Mechanical and Manufacturing Engineering, 2004)Osteoporosis, a condition characterised by a loss of bone mass, is of increasing clinical interest in an aging population. Bone formation and growth are controlled by genetic, hormonal and biomechanical factors. This ... -
Computational modelling of bone regeneration using a three-dimensional lattice approach
(Trinity College (Dublin, Ireland). Department of Mechanical and Manufacturing Engineering, 2009)Mechano-regulatory theories are indispensable for developing and understanding how mechanical forces modulate morphological and structural fitness of skeletal tissues. These theories have been incorporated into computational ... -
Pneumatic artificial muscles for human-friendly mobile service robots
(Trinity College Dublin. School of Engineering. Discipline of Mechanical & Manuf. Eng, 2019)Developing robotic systems which can operate in complex, human centred environments is a major challenge, but one which holds the promise of dramatically improving human living standards in several areas including ... -
An asperity deformation model for the sliding cylinder problem : theoretical and experimental investigations
(Trinity College (Dublin, Ireland). Department of Mechanical and Manufacturing Engineering, 2000)Statistical analysis shows that the main reason for the failure of machines is not breakage but wear of the moving parts resulting from rubbing stress. Although the laws of friction are fairly well substantiated, there are ... -
A study of the role of oil additives in the failure of ball bearings
(Trinity College (Dublin, Ireland). Department of Mechanical and Manufacturing Engineering, 2000)This thesis examines the influence that extreme pressure oil additives have in the failure of ball bearings. Additives are commonly used in lubricating oils to improve their properties. In recent years some sections of ... -
THEREPI: A therapeutic epicardial reservoir for the treatment of cardiac disease
(Trinity College Dublin. School of Engineering. Discipline of Mechanical & Manuf. Eng, 2019)The clinical translation of regenerative therapy for the diseased heart, whether in the form of cells, macromolecules or small molecules, is hampered by several factors: the poor retention and short biological half-life ... -
Computational and experimental investigation of bone cell response to mechanical stimuli
(Trinity College (Dublin, Ireland). Department of Mechanical and Manufacturing Engineering, 2006)The importance of mechanical loading in maintaining bone quality is well illustrated by the drastic effects of its absence in, for example, microgravity, cast immobilisation or paraplegia. The mechanisms underlying adaptation ...
