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 23 for “"Environmental Testing"”.
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Parametric Study of Environmental Testing in Satellite Manufacturing
… the aerospace industry. These satellites require environmental qualification testing to meet the standards required to launch and operate in space. For a new product, it is unclear how much testing capability will be necessary. This paper will provide an in-depth look at efforts to estimate the …
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Fusing Modeling and Testing to Enhance Environmental Testing Approaches
… is frequently determined through modeling and testing of components. Modeling provides a cost effective method for rapidly developing a knowledge of the system, however the model is incapable of accounting for fluctuations that occur in physical spaces. Testing, when performed properly, …
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Using Reinforcement Learning and Bayesian Optimization on Problems in Vehicle Dynamics and Random Vibration Environmental Testing
… challenging problems in vehicle automation and environmental testing.The first part of this dissertation presents the application of Reinforcement Learning (RL) to control a vehicle to get unstuck from a ditch. A simulation model of a vehicle moving on an arbitrary ditch surface was developed, …
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Liquid lens beam steering and environmental testing for the miniature optical steered antenna for inter-satellite communication
We investigate the feasibility of using a series of deformable liquid lenses to achieve wide-angle beam steering for CubeSat laser communication (lasercom) crosslinks. Liquid lenses are lenses that can non-mechanically alter focal length based on an applied voltage or current. We evaluate two …
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Experimental and modelling analysis on the performance of anisotropic conductive films as used in electronics packaging
… when subjected to certain manufacturing and environmental testing conditions. The manufacturing condition investigated was a subsequent solder reflow process on an ACF flip-chip bonded device. The environmental testing condition investigated was the moisture test. For the manufacturing …
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Predictive Simulations of the Impedance-Matched Multi-Axis Test Method Using Data-Driven Modeling
Environmental testing is essential to certify systems to withstand the harsh dynamic loads they may experience in their service environment or during transport. For example, satel- lites are subjected to large vibration and acoustic loads when transported into orbit and need to be certified with …
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Development of CubeSat Vibration Testing Capabilities for the Naval Postgraduate School and Cal Poly San Luis Obispo
… Launching a CubeSat, such as NPS-SCAT, requires environmental testing to ensure not only the success of the mission, but also the safety of other CubeSats housed in the same deployer. This thesis will address the development of CubeSat vibration testing methodology at NPS, including subsystem …
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Effect of a derivatized oxide layer and environment on the bond durability of aluminum/polyimide and titanium/polyimide bonds
… with LaRC-IA adhesive in a wedge test geometry. Environmental testing consisted of static and cyclical exposure for 240 hours in three atmospheres: 1) 170°C, 2 torr; 2) -20°C; 3) 60°C, 70% relative humidity. Crack propagation arrested within 48 hours. The order of durability in static …
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Design and testing of a pan-tilt mechanism for severe environments
… tests. The prototype was also subjected to environmental testing to military standards for temperature, vibration, and shock. Future improvements in machine function, promising areas for optimization, and an initial direction for taking the machine from prototype to product are presented.
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Design and Validation of Hardware-in-the-Loop Testbed for Proximity Operations Payloads
… is a new testbed design for CubeSat and payload testing and development. This research demonstrates a low-cost, hardware-in-the-loop testing apparatus for use with university CubeSat programs for testing throughout the different levels of the development process. The average university CubeSat …
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Design, Validation, and Verification of the Cal Poly Educational Cubesat Kit Structure
… system, as well as adding the ability to be environmentally tested. Manufacturing of the structure is completed with both additive (Fused Deposition Modeling with ABS polymer and Selective Laser Melting with AlSi10Mg metal) and subtractive (milling with Al-6061) technologies. Modal, harmonic, …
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Optical Performance and Prototyping of a Liquid Lens Laser Communications Transceiver
… in this work. The liquid lenses undergo environmental testing for liquid lenses, including microgravity testing, radiation exposure, and quantifying how much power the lenses can effectively couple. An analytic formulation of beam steering is presented, which can be used as a feedforward …
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Load bearing interface design for a pan-tilt mechanism for severe marine environments
… (pan and tilt) machine. Vibration and shock testing induced failure in the interface between the payload and the tilt shaft, through which the control cabling connected to the sensors, taking the system out of service and creating a hazard for Sailors. This thesis proposes a tapered, hollowed …
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CubeSat Data Transmission and Storage Throughput Optimization Through the Use of a Zynq SoC Based CubeSat Science Instrument Interface Electronics Board
… This report outlines the design, fabrication and testing of this solution. The completion of the Zynq Processing System CubeSat Science Instrument Interface Electronics Board (or ZPS-Board), ultimately demonstrates the feasibility of this solution. Additionally, this research is funded by NASA’s …
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Design, Analysis, Fabrication, and Testing of a Nanosatellite Structure
… and the model boundary conditions. We perform environmental testing on the integrated spacecraft at NASA Wallops Flight Facility to investigate the properties of the structural assembly. Finally, we create a model of the ION-F stack to verify the integrity of the structure at the launch loads. …
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Development of Cal Poly's Shock Table
<p>Shock is one of the environmental tests that a spacecraft must pass before being cleared for launch. Shock testing poses a challenging data acquisition issue and careful selection of equipment is crucial to creating a successful shock test facility. Cal Poly’s CubeSat programs can currently …
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Micro-Manipulation and Bandwidth Characterization of Ionic Polymer Actuators
… different humidity levels to assess the impact environmental conditions had on the response. It was shown that lower humidity levels cause the system parameters to shift at a higher rate. The two configurations tested were clamped-free and clamped-clamped, in an effort to bound the performance …
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Design and Characterization of Liquid Metal Flip Chip Interconnections for Heterogeneous Microwave Assemblies
… applications. In the future, additional environmental testing and further refinement of the processing flow, such as improved contact metallurgy, are needed to make this interconnect approach more viable for large volume manufacturing.
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Evaluation of PFAS in Environmental Solids: Retention Devices and a Screening Method
… contaminated sites.To address this first need, environmental and bench-scale tests were conducted to investigate PFAS sorption to sediment retention devices and to evaluate their potential to limit PFAS spread. Devices such as straw wattle and SiltSoxx are commonly used to filter stormwater and …
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The effect of nitrogen and inclusions on fracture and fatigue of steel.
… for the key elements, and additional specialised testing was carried out using internal friction to determine the free nitrogen and carbon content. The effects of temperature on the mechanical properties were investigated in detail. In agreement with previous studies, work hardening peaks, minima …
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