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 78 for “"cranes"”.
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Cranes and crops: investigating the viability of blue cranes in agricultural lands of the Western Cape
The Western Cape population of Blue Cranes (Anthropoides paradiseus) is of great importance as the largest and most stable population throughout its range. This species is strongly associated with agricultural lands in the Western Cape, and therefore may come into conflict with farmers who perceive …
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Anti-swing control of overhead cranes
Overhead cranes are widely used for transporting large and heavy suspended objects such as shipping containers. Acceleration and deceleration of the crane generally induce swinging motion in the suspended payload. A method is presented to find the trajectory for an overhead crane that will ensure …
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Control of Gantry and Tower Cranes
… and practical controllers for gantry and tower cranes. The controllers are designed to transfer the load from point to point as fast as possible and, at the same time, the load swing is kept small during the transfer process and completely vanishes at the load destination. Moreover, variations …
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Internal Damping Rates of Construction Cranes
The conveyance of payloads by construction cranes generates pendulations of the payload. This research provides a critical design parameter for the development of a device that aids in reduction of these pendulations. Previous research developed a tuned mass damping system, that effectively …
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Cargo Pendulation Reduction on Ship-Mounted Cranes
… to a smaller ship at sea. Specially designed craneships are used for this task, however the wave-induced motions of the ship can cause large pendulations of cargo being hoisted by a ship-mounted crane. This makes cargo transfer in rough seas extremely dangerous and therefore transfer …
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Reproductive Ecology of Greater Sandhill Cranes in Nevada
… and chicks (i.e., colts) of greater sandhill cranes (Grus canadensis tabida) in northeastern Nevada, USA, during 2009-2010. We monitored 161 nests and 101 colts and used a maximum-likelihood based approach to test multiple competing hypotheses and estimate daily survival rates, nest success, …
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Impact of mobile cranes on short span bridges
… literature has shown that even though mobile cranes are regarded as abnormal vehicles, they have different suspension system, axle spacing and use different wheels compared to heavy good vehicles. These characteristics help minimise their impact on road structures. This thesis presents a study …
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Virtual Reality Simulation of Ships and Ship-Mounted Cranes
… a virtual simulation of ships and ship-mounted cranes. The simulation is carried out in a Cave Automated Virtual Environment (CAVE). This simulation serves as a platform to study the dynamics of ships and ship-mounted cranes under dynamic sea environments and as a training platform for …
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A dynamic damping device for payload pendulations of construction cranes
… systems have typically been applied to overhead cranes within the manufacturing and shipping industries. The construction industry in contrast, has failed to innovate tower and mobile cranes. This can be traced to the complexity of the construction operation and the conditions under which the …
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Migratory Ecology and Movement Patterns of Mid-Continent and Eastern Sandhill Cranes
Sandhill cranes (Antigone canadensis) are long-lived birds with relatively low recruitment rates, making accurate knowledge of abundance and distribution critical for well-informed harvest management. Minnesota is one of few states containing portions of 2 different breeding populations of greater …
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Vigilance behavior and land use by sandhill cranes (<i>grus canadensis</i>)
… postures that could be interpreted as vigilance. Cranes significantly altered the time spent in the alert investigative posture with differences in gender and modal non-vigilant behavior. They significantly altered the time spent in the tall alert posture with differences in gender, breeding …
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The movement and landscape use of Blue Cranes in the Western Cape
The Western Cape population of Blue Cranes (Anthropoides paradiseus) is the largest and most stable population for the species. The population is primarily threatened by high mortality due to collisions with power-lines and the development of wind farms. Yet, little is known about how this …
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Autumn Foraging and Staging Ecology of Eastern Population Sandhill Cranes (Antigone canadensis tabida)
… The Eastern Population of Greater Sandhill Cranes (Antigone canadensis tabida; EP herein) likely began to recolonize Ontario and its historic range starting in the early 1900s and now relies on agricultural grain during migration. Accordingly, ecologists possess little knowledge of how EP …
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Cooperative Hoisting with Dual Crawler Cranes: Modeling, Motion Planning, and Control under Constraints
… and modular plant construction dual crawler cranes (DCCs) have become essential equipment for handling oversized and heavy loads. Their cooperative hoisting capability enables the manipulation of massive structures beyond the lifting capacity of a single crane. However, due to the cooperative …
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Control of Rotary Cranes Using Fuzzy Logic and Time-Delayed Position Feedback Control
Rotary Cranes (Tower Cranes) are common industrial structures that are used in building construction, factories, and harbors. These cranes are usually operated manually. With the size of these cranes becoming larger and the motion expected to be faster, the process of controlling them became dicult …
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Adaptation of Delayed Position Feedback to the Reduction of Sway of Container Cranes
Cranes are increasingly used in transportation and construction. increasing demand and faster requirements necessitate better and more efficient controllers to guarantee fast turn-around time and to meet safety requirements. Container cranes are used extensively in ship-to-port and port-to-ship …
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Experimental design and results of 2D dynamic damping of payload motion for cranes
Cranes, which comprise a significant class of material handling equipment, are basically designed to lift and lower loads. In addition to dynamic loading, cranes are exposed to loads which may be environment specific. Many crane accidents are due to uncontrolled swaying of the payload resulting in …
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A Control System for the Reduction of Cargo Pendulation of Ship-Mounted Cranes
Ship-mounted cranes are used to transfer cargo from large container ships to smaller lighters when deep-water ports are not available. The wave-induced motion of the crane ship produces large pendulations of hoisted cargo and causes operations to be suspended. In this work, we show that in boom …
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Shake table experiments for the determination of the seismic response of jumbo container cranes
Container cranes represent one of the most critical components of ports worldwide. Despite their importance to port operations, the seismic behavior of cranes has been largely ignored. Since the 1960s, industry experts have recommended allowing cranes to uplift, believing that it would limit the …
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Below-Ground Food Production in Habitats Utilized by the Rocky Mountain Populations of Greater Sandhill Cranes
… distribution of below-ground foods used by RMP cranes in agricultural fields and wetlands across six annual cycle events in 2006 and 2007 (wintering, spring staging, spring stopover, breeding, post-breeding, and fall staging). Below-ground foods were sampled in sandhill crane foraging habitats …
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