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 37 for “"Path generation"”.
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Multiple-Path Generation to Improve Autonomous Vehicle Planning
Path planning is an integral part of ensuring autonomous vehicles become more safe and efficient in order to facilitate greater adoption of the technology and make it a viable option for an increased number of applications. While there are many documented approaches to path planning on roads, the …
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Automatic tool path generation for multi-axis machining
… in terms of machining features, we generate tool paths directly by analyzing the accessibility of the surface of the part. This eliminates the problem of feature extraction. We envision this as the core strategy of a new direct and seamless CAD/ CAM system. We perform the accessibility analysis in …
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Terminal area flight path generation using parallel constraint propagation
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1989.
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An interactive virtual endoscopy tool with automotive path generation
Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2002.
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Automatic tool path generation for the rough machining of dies and molds.
… cutter, the sequence of cut and the optimal tool path strategy (parallel offset, stock offset, or component offset). Finally, the NC code is generated, the machining of the entire part is simulated, and machining time and cost are calculated. This system can reduce tool path designing time by up …
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Manipulator’s configuration design, excavation path generation, and underground object detection for an autonomous electric excavator
… to develop and test the PSO-based and PFM-Based path generation algorithms for this excavator in order to save energy, maintain the digging efficiency, and avoid colliding with underground objects. In addition, the third one is to detect the metallic pipes and electricity carrying wires …
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Minimum error tool path generation method and an interpolator design technique for ultra-precision multi-axis CNC machining
… interpolation method. A novel off-line tool path generation methodology for is developed and reported in this thesis in order to solve the non-linearity error problem in ultra-precision multi-axis CNC machining. The new off-line tool path generation method reduces non-linearity errors by …
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Data-driven flight path rerouting during adverse weather: Design and development of a passenger-centric model and framework for alternative flight path generation using nature inspired techniques
… procedures such as finding an alternative flight path can usually be carried out. However, such procedures usually introduce extra costs such as flight delay. Hence, there exists a need for alternative flight paths that efficiently avoid adverse weather regions while minimising costs. Existing …
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Vision-Based Obstacle Avoidance for Multiple Vehicles Performing Time-Critical Missions
… to arrive at a final destination simultaneously. Path generation for each vehicle is computed using a single polynomial function that incorporates the vehicle constraints on velocity and acceleration and satisfies boundary conditions by construction. Furthermore, the arrival criterion and a …
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Extensions of motion planning algorithms
… algorithms are able to generate collision-free paths without the information of obstacles, they still have two weaknesses: one is that it is challenging to pass through narrow passages, which might result in path generation failures; the other is that a fixed search scope might lead to a waste …
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A PC implemented kinematic synthesis system for planar linkages
… be used for three and four position synthesis of path generation, path generation with input timing, body guidance, and body guidance with input timing linkages. The package can also be used for function generation linkages where the user may enter a set of angle pairs or choose one of the …
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Mathematical Modelling and Control System Development of a Remote Controlled, IMU Stabilised Hexapod Robot
… to previous iterations of the hexapod. Using a path generation algorithm sets of foot positions and velocities are generated. Generating these points in real time allows for walking in any direction without any pre-defined foot positions. To enable attitude control of the hexapod body, an …
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Boosting static timing analysis with programming and algorithmic approaches
… efficiency over existing tools. Critical path generation is a major objective timing analysis. Optimization tools always need to report on critical paths under several path constraints. We propose a general path search algorithm which can fulfill all practical path constraints and …
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Design and manufacture of an ultra-high field ex vivo coil assembly
… vacuum casting system, and an automatic tool-path generation program for machining directly from STL files. Finally, an improved method and apparatus for degassing the tissue samples is developed and implemented leading to improvements in MRI image quality.
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Identification of barriers and least cost paths for autonomous vehicle navigation using airborne LIDAR data
… role in identifying barriers and least cost paths for such vehicles. Least cost paths minimize the sum of impedance across a surface. Impedance can be measured by steepness of slope, impenetrable barriers such as vegetation and buildings, fence lines and streams, or other factors deemed …
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Human-automation collaboration : decision support for lunar and planetary exploration
… between humans and automation for geospatial path problem solving within the high-risk domain of human planetary surface exploration, where decisions are time critical and humans must adapt to uncertainty. In order to develop flexible and robust decision support systems for Lunar and planetary …
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Automatic 5-axis NC toolpath generation
Despite over a decade of research, automatic toolpath generation has remained an elusive goal for 5-axis NC machining. This thesis describes the theoretical and practical issues associated with generating collision free five-axis roughing and finishing toolpaths automatically from the CAD model of …
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A gait generation mechanism for leg rehabilitation therapy
… are unable to walk secondary to any number of pathologies, such as traumatic brain injury (TBI), spinal cord injury (SCI), cerebrovascular accidents (CVA), cerebral palsy (CP), multiple sclerosis (MS), Parkinson's disease, as well as various orthopedic conditions. Decreased activity has been …
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Time-optimal CNC tool paths : a mathematical model of machining
… to obtain skeletal information on the toolpaths. This framework is more amenable to the techniques of continuum mechanics and differential geometry rather than to path generation and conventional CAD/CAM (Computer Aided Design and Manufacturing) theory. After the formulation, this thesis …
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Metaheuristics for Multi Criteria Path Optimisation
In real world applications, the path-planning problem is one that is multi-criteria in nature though given the complexity of the task is one that is often condensed to a single criterion issue, either by the consideration of only a single objective or condensing several criteria into a single …
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