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 556 for “"payload"”.
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Statistical approach to payload capability forecasting for large commercial aircraft operating payload range limited routes
… transporting maximum fuel capacity and maximum payload simultaneously. Maximum payload range remains less than maximum range. When an aircraft is operated on a route that may exceed its maximum payload range capability, environmental conditions can vary the payload capability by as much as 20%. …
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Tethered Payload Control from an Autonomous Helicopter
… tether interfering with the robot's mobility. A payload sway damping controller is investigated and simulated. Its is shown to be effective in damping dangerous payload oscillations by modulating the vertical manipulation of the winch during hoisting. Future design recommendations are given …
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Optimizing log truck payload through improved weight control
Trucking of forest products is a very important segment of the harvesting process and it is monitored relatively closely by external sources. Load weight is the focal point of the attention received by log hauling. The optimization of load weights is therefore very important to a logging …
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Underslung Payload Tension Control from an Autonomous Unmanned Helicopter
A tension control algorithm for the deployment of a unmanned ground vehicle from an autonomous helicopter is designed and tested in this thesis. The physical hardware which the controller will run on is detailed. The plant model and underlying controllers are derived and modeled. The tension …
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Decreasing the cost of hauling timber through increased payload
… costs in the South by increasing truck payloads was investigated using a combination of theoretical and case-study methods. A survey of transportation regulations in the South found considerable disparities between states. Attempts to model the factors which determine payload per unit of …
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Combined Aircraft and Payload Design Optimization Using a Multidisciplinary Architecture
… is further complicated by the analysis of payload performance. Depending on the subsystem being considered, extensive modeling efforts may be required. Unintuitive performance tradeoffs can also become inherent to a design when multiple subsystems are considered simultaneously. To support …
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Extra robotic legs for augmenting human payload and positioning capabilities
… robot legs that help bear a heavy backpack payload and a portion of the operator's own weight. The design was driven by a need to increase the effectiveness of Department of Energy hazardous material emergency response personnel who are encumbered by their Personal Protective Equipment. …
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Design of a Helicopter Slung Vehicle for Actuated Payload Placement
… a helicopter slung vehicle used to carry the payload and furthermore, provide a means of actuation for the payload. This provides more control authority to the system and may ultimately allow a helicopter to fly higher with a longer tether. The vehicle designed in this thesis was designed for …
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Ancillary Scientific Instrument Attachment (ASIA): A Distributed Hitchhiker Payload Carrier
… small, mass-produced, non-deployable hitchhiker payload to modern spacecraft buses is investigated, and a case study of one such payload is presented. The Ancillary Scientific Instrument Attachment (ASIA) is a modified CubeSat bus that can be mass produced, independently tested, and delivered to …
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A dynamic damping device for payload pendulations of construction cranes
… efficiently and safely however, suffers from payload pendulations. This cyclic motion of crane cable and payload produces schedule delays, property damage, and high risk to personnel. Current pendulation reduction systems have typically been applied to overhead cranes within the manufacturing …
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Cooperative control of autonomous mobile robot collectives in payload transportation
… robots in the lifting and lowering processes of payload transportation. Unlike previous applications of behavior-based control to payload transportation, we examine control of a payload in a vertical plane. Others before have examined moving payloads on a horizontal surface through pushing …
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Optimal Control of Multiple Quadrotors for Transporting a Cable Suspended Payload
… flight control performance for a cable suspended payload with single and two quadrotors based on optimised control techniques. The study utilised optimal controllers, such as the Linear Quadratic Regulator LQR, the Iterative based LQR (ILQR), the Model Predictive Control MPC and the dynamic game …
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Leveraging Next Generation Mobile Networks for Drone Telemetry and Payload Communication
small Unmanned Aerial Systems (sUAS) have seen their adoption increasing over the past recent years. The adoption is by hobbyists for leisure or by the industry for business and commercial use and as such, use case applications may vary enormously. Such use cases include but are not limited to …
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Design of a Micro Wireless Instrumented Payload for Unmanned Vehicle Testing
… aerial vehicles. The micro wireless instrumented payload, or μWIP, was designed precisely for this purpose. The μWIP includes a GPS receiver, 3-axis accelerometer, 3-axis gyroscope, and 3-axis magnetometer which are used to measure an unmanned vehicle's position and orientation. The device also …
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A micro-coded controller for a medium data rate satellite payload simulator
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1994.
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Using a co-located GNSS radio occultation payload for microwave radiometer calibration
This study presents a new method of calibrating an orbital cross-track scanning microwave radiometer using a co-located radio occultation (RO) instrument with Global Navigation Satellite Systems (GNSS). The radiometer and RO receiver periodically observe the same volume of atmosphere near the …
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Dynamics of a Small Autonomous Underwater Vehicle That Tows a Large Payload
… autonomous underwater vehicle that tows a large payload. Our analysis is motivated by the fact that the payload is so large that it cannot be modeled by simply appending its dynamics to the dynamics of the autonomous underwater vehicle. Hence, the coupling between the vehicle and payload must be …
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Structural & Internal Acoustic Response of Cylinders with Applications to Rocket Payload Fairings
Future launch vehicle payload fairings will be manufactured from advanced lightweight composite materials. The loss of distributed mass causes a significant increase in the internal acoustic environment, causing a severe threat to the payload. Using piezoelectric actuators to control the fairing …
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Sounding Rocket Redesign And Optimization For Payload Expansion And In Flight Telemetry Transmittal
… undertaken. Currently, the capacity of the payload compartment in the upper stage of the Super Loki system is very limited. A redesign of the upper stage will allow larger and more versatile payloads to be carried, assuming the appropriate design parameters are met. It has therefore been …
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