Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 22 for “"Multi-body dynamics"”.
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Multi-body Dynamics Simulation and Analysis of Wave-adaptive Modular Vessels
… catamaran design. This thesis presents a set of multi-body dynamics simulation models created for two active WAM-Vs™ along with analysis on their suspension characteristics. Both models provide conclusive and realistic results, with the final model being validated against on-water testing data …
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Optimal Open Loop and Nonlinear Feedback Control for Remote Orbital Capture (multi-Body Dynamics, Recovery, Satellite Servicing, Payload Handling)
… to low-Earth orbit for servicing and repair. The dynamics of the coupled two-body system are described with equations of motion derived from an Eulerian formulation (the Hooker-Margulies equations). Two degrees of rotational freedom are allowed at the joint which connects the OMV and target …
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Dynamics of a Nutating Mill with Charge-Structure Interaction
… tumbling mills, yet their structural dynamics and charge-structure interactions remain poorly characterised. This study investigates the dynamic behaviour of a laboratory-scale nutating mill (NuMill) through experimental testing and a two-way coupled simulation combining multi-body …
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Development of an Electronic Stability Control for Improved Vehicle Handling using Co-Simulation
… Control (ESC) technologies into a commercial multi-body dynamics (MBD) software for full vehicle simulations. Among various control strategies for ESC, the sliding mode control (SMC) method is proposed to develop these algorithms, as it is proven to be excellent at overcoming the effect of …
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Approximations for Nonlinear Differential Algebraic Equations to Increase Real-time Simulation Efficiency
… a more realistic vehicle response. Typically, multi-body models are used to represent the vehicle dynamics, but these have the unfortunate drawback of requiring the solution of a set of coupled differential algebraic equations (DAE). DAE's are not conducive to real-time implementation such as …
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Multi-body dynamic and finite element modeling of ultra-large dump truck - haul road interactions for machine health and haul road structural integrity
… The equations were solved in MSC.ADAMS, based on multi-body dynamics, to generate the truck dynamic forces, which were verified and validated using data obtained from an open-pit mine. These forces were used in an FE model developed, verified and validated in ABAQUS to model the response of the …
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Vibration-Based Health Monitoring of Multiple-Stage Gear Train and Differential Planetary Transmission Involving Teeth Damage and Backlash Nonlinearity
… errors is investigated by utilizing a non-linear multi-body dynamics software model. The multi-body model drastically reduces the computation time required by finite element methods to simulate realistic operation. The gears are considered rigid with elastic contact surfaces defined by a penalty …
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Neural circuitry in motion: Computational modelling of motor cortical dynamics to understand human movement
Movement of the human body arises from a complex interaction between the activity of the nervous system and the biomechanics of the musculoskeletal system. How neurons of the brain and spinal cord produce purposeful, coordinated movements is a fundamental question in neuroscience and motor control …
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A Novel Fluid Structure Interaction and Thermal Model to Predict the Cylinder Block / Valve Plate Interface Performance in Swash Plate Type Axial Piston Machines
… For this purpose, a unique fully coupled multi-body dynamics model has been proposed to capture the complex fluid-structure interaction phenomena affecting the non-isothermal fluid film conditions.</p> <p>The model is able of determining the fluid film thickness as a function of the …
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Development and Application of Elastohydrodynamic Lubrication Model for Piston Pin
… in this study to investigate the lubrication and dynamics of the piston pin, taking into account the deformation of the structures and oil cavitation. The model employs multi-body dynamics and elasto-hydrodynamic lubrication. A routine for generating and processing compliance matrices was created …
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Simulation and Testing of Wave-Adaptive Modular Vessels
… of three different WAM-Vs were evaluated. A multi-body dynamics simulation was developed for the 100-ft WAM-V 'Proteus' based on an automotive 4-post shaker rig. The model was used to characterize the sensitivities of different suspension parameters and as a platform for future models. A …
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Design and Modeling of Parallel Exoskeleton for Wrist Tremor Suppression
… that manifest in limbs, the head, and other body parts. Among the existing treatments, mechanical loading through wearable rehabilitation devices is the best way to go due to them being non-invasive and without side-effects to the human body. Along this line, Exoskeletons are being developed …
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Discrete element method modelling of particle breakage and wear in High Pressure Grinding Rolls
… of the rolls in the mill was simulated. The multi-body dynamics (MBD) model has been validated to accurately simulate the dynamic response of the rolls. The micro-phenomena of particles, such as breakage behaviour and strength weakening were investigated and calibrated by implementing a …
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Modeling, Control, and Design Study of Balanced Pneumatic Suspension for Improved Roll Stability in Heavy Trucks
… a dynamically balanced system that resists body roll and provides added roll stability to the vehicle. The new suspension, referred to as "balanced suspension," is implemented by retrofitting a conventional pneumatic suspension with two leveling valves and a symmetric plumbing arrangement to …
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Modeling, estimation and control for serial flexible robot arms
… and planar robot arms rather than spatial multi-link robots. This dissertation presents a systematic approach for obtaining natural frequencies and mode-shapes for $n$-link spatial serial structures based on transfer matrices. The method is validated with experiments and software …
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Modélisation et optimisation de système de motorisation à chenille continue en caoutchouc pour engins agricoles
… La première fait la présentation du modèle de multi-body Dynamics (MBD) qui va servir de base pour la suite de cette étude. La présentation de ses sous-éléments (constitution et caractérisation) y est faite, ainsi que la stratégie de modélisation de la chenille par discrétisation en éléments …
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Implementation of a comprehensive methodology for structural dynamics and NVH simulation incorporating MBS, FEM and ray tracing
… process, necessitating explicit simulation of Multi-Body Simulations (MBSs) alongside Finite Element Methods (FEMs) with millions of Degrees of Freedom (DOF). Such computations place substantial demands on computer performance. However, owing to significant advancements in computer …
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Optimization and Characterization of Chance-Constrained Guidance, Navigation, and Control for Low-Energy Lunar Transfers
Low-energy transfers utilizing multi-body dynamics show great promise for future space exploration; in regions with multiple dominant gravitating bodies (for example, in the Earth-Moon system or among the gas giant moons) they can offer reduced capture Δv, more flexible launch windows, and an …
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Intricate dynamics and hydrodynamic frictional losses of the piston-ring assembly in internal combustion engines
… of friction on fuel economy, the intricate dynamics of the piston-assembly tend to significantly influence the thermal efficiency through blow-by, the engine durability through wear, and the engine noise through piston-slap. Moreover, 40 to 80% of the lubricant oil consumption has been …
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