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 48 for “"mass properties"”.
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Applied Mass Properties Identification Method to the Cal Poly's Spacecraft Simulator
… least square method is proposed to identify the mass properties and location of center of mass of the system. The tests use four sine wave generators that are out of phase with different amplitudes as the inputs to excite various structural modes of the system. The outputs, angular rates of the …
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Mass Properties Calculation and Fuel Analysis in the Conceptual Design of Uninhabited Air Vehicles
The determination of an aircraft's mass properties is critical during its conceptual design phase. Obtaining reliable mass property information early in the design of an aircraft can prevent design mistakes that can be extremely costly further along in the development process. In this thesis, …
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Evaluation of rock mass properties and abutment stability at the Gillis Falls dam site, Carroll County, Maryland
Includes bibliographical references (pages 91-94).
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An Analysis of the Stellar Mass Properties of Distant Galaxy Clusters From the Massive and Distant Clusters of WISE Survey (MaDCoWS)
… (ICM). In this work, I use the complementary Massive and Distant Clusters of WISE (MaDCoWS) infrared-selected survey to measure stellar mass properties of galaxy clusters at high redshift. I present initial measurements of the stellar mass fractions (f⋆) for a sample of MaDCoWS clusters and …
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System characterization and online mass property identification of the SPHERES formation flight testbed
… such as thruster strength and vehicle mass and inertia. The SPHERES testbed is described and the applications for formation flight are presented. Mass properties of the SPHERES satellites are examined because of their impact on control determination, with comparison between CAD model …
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Robust Adaptive Rigid Body State and Mass Property Estimation Via Unscented Kalman Filter on TSE(3) with Process Noise Estimation
<p>Mass property estimation, including mass, center of mass, and moment of inertia, is a crucial yet challenging problem in spacecraft autonomy and astrodynamics. Knowledge of mass properties of a spacecraft is essential for future astronautical missions, as changes in the mass properties of a …
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Dynamic programming applied to electromagnetic satellite actuation
… the system model, a novel method for finding the mass properties of a satellite, which would likely be used in the dynamic programming model, is introduced. This method is used to characterize the mass properties of three satellite systems: SPHERES, VERTIGO, and RINGS. Finally, a method for …
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Modeling and Validation of Tension-Element Based Mechanisms for Golf Ball-Club Impact
… by the dynamic effective face stiffness and mass properties of the club. This thesis creates and validates high-fidelity, non-linear, dynamic finite element models for the tension-element golf club concept. These models predicted COR with less than one percent error when compared to dynamic …
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Methodology for innovative health monitoring of aerospace structures using dynamic response measurements and advanced signal processing techniques
… be initially simulated by slightly varying the mass properties of the structure. As a second step, actual damage was introduced to the structure. The structural dynamic behavior has been numerically simulated and experimentally verified by means of vibration testing. The analysis of operational …
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Constitutive behaviour of cement treated marine clay
… After a 7-day curing period, the volume-mass properties, unconfined compressive, isotropic compressive, undrained and drained triaxial compressive tests were conducted to evaluate the mechanical behaviour of these specimens. The results show that the level of effective stress which the …
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Applied System Identification for a Four Wheel Reaction Wheel Platform
… identification process was used to obtain the mass properties of this simulator. A handling algorithm was developed to allow wireless data acquisition and command to the spacecraft simulator from a “ground” computer allowing the simulator to be free of induced torques due to wiring. The system …
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Investigation of factors governing the stability of stope panels in hard rock mines in order to define a suitable design methodology for shallow mining operations
… systematic design procedure or methodology. Rock mass characterisation, estimation of rock mass properties, identification of potential failure modes, appropriate stability analyses and other elements of the rock engineering design process are often neglected. Instead, panel lengths are often …
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Design principles for the development of space technology maturation laboratories aboard the International Space Station
… formation flight, communications requirements, mass properties identification, autonomous rendezvous and docking, and tethered formation flight.
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Designing a low cost XY stage for abrasive water jet cutting
… a product. Abrasive water jet cutting allows for mass customization of 2D parts, such as inlaid tiles. Most water jet cutters are based on a prismatic-prismatic design (gantry type). In an effort to reduce the number of precision parts in the machine, a rotary-rotary parallel drive design is …
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Revisiting Rock Mass Indices: Improving and Applying the Measurement of Erodibility
… exist to quantify erodibility that examine rock mass properties such as fracture characteristics and strength of intact rock. These systems can be used to predict such varied properties as the slope of a rock mass, the geometry of bedrock channels, and the likelihood and type of potential slope …
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Application of Measurement While Drilling Data for Mine Blast Optimization Utilizing Machine Learning Techniques with Iron Ore Mine Data
… design purposes. The distribution of material properties within a rock mass is very unpredictable so to more accurately determine its characteristics a controlled drilling environment is needed. Many mines possess the capacity to record Measurement While Drilling (MWD) data but don't utilize …
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Simulation development and analysis of attitude-control system architectures for an astronaut mobility unit
… analyzes the specific system configuration (i.e. mass properties, thruster location and placement, CMG architecture, etc.) and the mission and system requirements to provide an "idealized" CMG model. Detailed simulation results and recommendations are presented for the design and analysis of the …
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Modeling dispersions in initial conditions for air-launched rockets and their effect on vehicle performance
… for a generic air-launch system are presented. Mass properties, propulsion characteristics, and vehicle aerodynamics are estimated for the generic rocket configuration. A six-degree-of-freedom (6-DOF) simulation models the vehicle's behavior during the uncontrolled drop phase prior to rocket …
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Evolution of the Irminger Current anticyclones in the Labrador Sea from hydrographic data
… understand the factors governing the exchange of properties between the boundary and interior. A significant fraction of heat and fresh water, needed to balance the annual heat loss and to contribute to the seasonal freshening of the Labrador Sea, is thought to be provided by coherent long-lived …
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Evolution of the Irminger Current anticyclones in the Labrador Sea from hydrographic data
… understand the factors governing the exchange of properties between the boundary and interior. A significant fraction of heat and fresh water, needed to balance the annual heat loss and to contribute to the seasonal freshening of the Labrador Sea, is thought to be provided by coherent long-lived …
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