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 33 for “"Excavator"”.
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Development of a Virtual Reality Excavator Simulator: a Mathematical Model of Excavator Digging and a Calculation Methodology
… In order to ensure that a VR construction excavator simulator provides convincing operating results to users, the focus of simulator development needs to be shifted to interaction of physically valid soil and the excavator machine. This research aims to contribute to the development of a VR …
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DESIGN AND MANUFACTURING OF A VIRTUAL REALITY-ASSISTED TELEOPERATED EXCAVATOR PLATFORM
… the development of a teleoperation system for excavator robot using virtual reality (VR) technologies. The purpose of this study is to implement VR for a teleoperated excavator that the operator uses a VR headset instead of conventional video stream displays. This system provides a better …
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Manipulator’s configuration design, excavation path generation, and underground object detection for an autonomous electric excavator
… As a solution to these problems, an autonomous excavator is expected in high demand. To increase the energy efficiency in autonomous excavators, and increase the safety of operation for them, the objectives of this research are threefolds. The first one is to design and fabricate an excavator …
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A data-driven approach to bucket-filling control for autonomous excavators
… statistical control method for autonomous excavators. Interactions between soil and an excavator bucket are highly complex and nonlinear, making traditional physical modeling difficult to use for real-time control. Here, we propose a data-driven method, exploiting data obtained from …
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Teleoperated Control of Hydraulic Equipment for Hazardous Material Handling
… students and faculty converted a Case CX-160 excavator to teleoperated control. With full wireless functionality of the excavator's six degrees-of-freedom, ignition, and remote cameras at 3000 ft., the teleoperated design meets or exceeds customer demands. For over a year, the teleoperated …
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ΠΑΡΑΜΕΤΡΟΙ ΠΟΥ ΕΠΗΡΕΑΖΟΥΝ ΤΗΝ ΕΞΟΡΥΞΙΜΟΤΗΤΑ ΤΩΝ ΠΕΤΡΩΜΑΤΩΝ ΜΕ ΚΑΔΟΦΟΡΟ ΕΚΣΚΑΦΕΑ
… THE EFFECTIVE OUTPUT OF THE BUCKET WHEEL EXCAVATOR AND THE SPECIFIC DIGGING ENERGY OF THE ROCK MASS. THE PROPOSED CRITERION IS FORMULATED BY USING THE SIMULATORBWDIG, WHICH SIMULATES THE DIGGING OPERATION OF A STANDARD BUCKET WHEEL EXCAVATOR WITH A CROWDLESS-TYPE BUCKET WHEEL BOOM, …
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Acquisition, retention and transfer of heavy equipment operator skills through simulator training
… specific types of heavy construction equipment: excavator and wheel loader. It aims at decomposing the complexity of equipment operation and distinguishing the skills to be acquired for each machine. It consists of five studies, three conducted with students at Purdue and two with expert …
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Real-time trajectory optimization for excavators by power maximization
… for controlling the motion of an autonomous excavator arm during excavation is presented. To deal with the challenge, posed by modeling and planning trajectories through soil, a model-free method is proposed which aims at maximally harnessing the capabilities of the excavator by matching its …
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Characterization of infield duty cycles and exhaust emissions from diesel powered off-road heavy-duty equipment
… data was collected from a Komatsu hydraulic excavator and a Caterpillar track-type tractor.;For the excavator, data was logged during in-field operation, and test cycles were created on a dynamometer test bed using this data. For the tractor, on-board emissions measurement equipment collected …
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Development of an integrated tracking control algorithm and a test platform for autonomous excavation
… improve productivity, accuracy, and efficiency. Excavator is one of the key equipment in the construction field for earthmoving operations. In this study, an effective control strategy for excavation is introduced considering the position, contour, and force which are mutually associated factors …
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An Investigation of Diggability and Other Digging Effort Related Metrics for Cable Shovels at Multiple Mines
… fragmentation distribution, blasting practices, excavator capabilities and other factors on calculated values. Results showed that fragmentation size distribution and excavator capabilities (power and size) influenced shovel behaviour significantly, resulting in public domain diggability metrics …
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Methods for Control in Robotic Excavation
… to meet the ever growing demand for skilled excavator operators in the construction, infrastructure, mining and agriculture industries. The development of fully autonomous excavation systems is hindered by inadequate methods to deal with the interaction between the machine and soil. The …
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Characterizing The Response Of A Force Feedback Joystick
… capable of force feedback to be part of their excavator simulator. Using the joystick, they will study the effects of force feedback on novice and experienced heavy machinery users and with the goal of understanding how force feedback can affect learning quality and speed. To create this force …
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Financial analysis in multidisciplinary design optimization
… to the baseplate, a component used within the excavator pump, and optimized across three different disciplines of cost, natural frequency and temperature to find the baseplate design with the highest sales potential.
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Analysis Of Fatal And Nonfatal Accidents Involving Earthmoving Equipment Operators And On-Foot Workers
… for four type of equipment; backhoe, bulldozer, excavator and scraper were incorporated in the study using categorical variables. Degree of injury indicating the severity of accident outcome (fatal vs. nonfatal) was selected as the dependent variable, and a variety of factors potentially …
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Monitoring and designing built environments with computer vision
… and segmenting construction worker and excavator activities, and introduce benchmark datasets to incentivize further research in this direction. Secondly, motivated by the need for semantic understanding of scenes for progress monitoring, we explore means of encouraging the geometric …
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Tekison Cave: A Case Study in Archaeological Collection Rehabilitation and Accessibility
… with stakeholders: WDFW, one of the original excavators, and Native American descendant communities. For the rehabilitation, 661 bags and more than 4,406 objects were organized, cataloged, and housed following federal standards, including 295 lithic artifacts, 207 perishable artifacts, and …
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Kinematic and dynamic calibration of hydraulically actuated manipulators
… fixture, were identified for a Caterpillar 215B excavator. In the area of dynamic calibration of hydraulic machines, a new methodology for the dynamics of a complex hybrid open-closed chain hydraulic manipulator was derived based on the Newton-Euler formulation. It was shown by simulation that …
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DEM-based numerical simulation of drainage plows and dewatering trenchers
… superior performance. Additionally, an excavator plow point may be a viable alternative if increased wear at the point tip and slightly higher wear on the front of the boot is acceptable. Then, the work is further extended to the investigations of a dewatering trencher cutting through …
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