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Synthetic Jet Actuator For Active Flow Control, Sherif Abdou 2014 McMaster University

Synthetic Jet Actuator For Active Flow Control, Sherif Abdou

Open Access Dissertations and Theses

This thesis investigates the characteristics of a long aspect ratio synthetic jet actuator and its application for the active control of the vibrations of the downstream cylinder in a tandem cylinder arrangement.

A long aspect ratio synthetic jet is produced through an axial slit along part of the length of a cylinder. The jet is excited acoustically by a pair of loudspeakers mounted at the cylinder terminations. The study compares between the performance of two different slits with aspect ratios of 273 and 773. The comparison is based on the spanwise distribution of the mean jet velocity and phase between ...


The Use Of The Blackboard Architecture For A Decision Making System For The Control Of Craft With Various Actuator And Movement Capabilities, Jeremy Straub, Hassan Reza 2014 SelectedWorks

The Use Of The Blackboard Architecture For A Decision Making System For The Control Of Craft With Various Actuator And Movement Capabilities, Jeremy Straub, Hassan Reza

Jeremy Straub

This paper provides an overview of an approach to the control of multiple craft with heterogeneous movement and actuation characteristics that is based on the Blackboard software architecture. An overview of the Blackboard architecture is provided. Then, the operational and mission requirements that dictate the need for autonomous control are characterized and the utility of the Blackboard architecture is for meeting these requirements is discussed. The performance of a best-path solver and naïve solver are compared. The results demonstrate that the best-path solver outperforms the naïve solver in the amount of time taken to generate a solution; however, the number ...


Physical Simulation Of Tornado-Like Vortices, Maryam Refan 2014 Western University

Physical Simulation Of Tornado-Like Vortices, Maryam Refan

University of Western Ontario - Electronic Thesis and Dissertation Repository

Scaling ratios of simulations are essential to research the effect of tornadic winds on buildings and structures, in both experimental and numerical studies. In order to determine the proper scaling, access to wind fields of simulated and full-scale tornadoes is needed. For the first time here Doppler radar tornado velocity fields are analyzed and compared to experimental tornado-like vortices data in order to establish the scaling necessary to simulate tornadoes in a physical laboratory setting.

A prototype three-dimensional wind testing chamber capable of simulating tornadoes, named Model WindEEE Dome (MWD), was designed and built. Tornado-like vortices were simulated and investigated ...


Evolution Of The Software Defined Radio (Sdr) For The Open Orbiter Project, Michael Wegerson, Jeremy Straub, Sima Noghanian 2014 SelectedWorks

Evolution Of The Software Defined Radio (Sdr) For The Open Orbiter Project, Michael Wegerson, Jeremy Straub, Sima Noghanian

Jeremy Straub

Software Defined Radios (SDRs) are an exciting development in radio technology. The SDR uses software to perform many of the tasks that only hardware could previously complete on a traditional analog radio. Such tasks include encoding/decoding or applying filters to reduce noise on the signal. This powerful fusion of software and hardware have allowed SDR to be smaller in size and have a greater functionality than traditional radio setups; a perfect solution for our Open Orbiter satellite. Currently, the implementation we use consists of a simple $20 USB TV decoder for receiving, a Raspberry Pi micro-computer for transmission, and ...


Software Group Of The Openorbiter Project, Christoffer Korvald, Jeremy Straub 2014 SelectedWorks

Software Group Of The Openorbiter Project, Christoffer Korvald, Jeremy Straub

Jeremy Straub

This poster provides an update regarding software development work for the OpenOrbiter project. The software development effort for the OpenOrbiter project currently consists of four teams: payload software development, operating software development, ground station software development and testing. The teams are designing and developing the software needed to create and operate a small spacecraft which can be produced for under USD $5,000 by students, faculty and others around the world. Participating students are gaining valuable real-world experience through the process of designing and developing the spacecraft. Each team is headed by a team lead that is responsible for conducting ...


Openorbiter Ground Station Software, Alexander Lewis, Jacob Huhn, Jeremy Straub, Travis Desell, Scott Kerlin 2014 SelectedWorks

Openorbiter Ground Station Software, Alexander Lewis, Jacob Huhn, Jeremy Straub, Travis Desell, Scott Kerlin

Jeremy Straub

The OpenOrbiter Small Spacecraft Development Initiative[1] at the University of North Dakota is working to design and build a low cost[2] and open-hardware / opensource software CubeSat[3]. The Ground Station is the user interface for operators of the satellite. The ground station software must manage spacecraft communications, track its orbital location , manage task assignment, provide security and retrieve the data from the spacecraft. This will be presented via a graphical user interface that allows a user to easily perform these tasks.


The Use Of The Roofsat For Computer Science And Engineering Education, Jeremy Straub, Ronald Marsh 2014 SelectedWorks

The Use Of The Roofsat For Computer Science And Engineering Education, Jeremy Straub, Ronald Marsh

Jeremy Straub

This poster presents an overview of a tool that has been created to provide students with real-world experience in the design, development and operation of control and scientific mission software for a cyber-physical system. The ROOFSAT, developed at UND, is a low-cost analog for a small spacecraft (though in many ways these capabilities also enable similar UAV work). The ROOFSAT was constructed with approximately $1,500 generously provided by the John D. Odegard School of Aerospace Sciences out of commercially-available parts. It includes multiple cameras, a pan-tilt mount and the same space-qualified computer hardware which has been used on both ...


The Development Of A Nanosatellite-Class Sunsat At The University Of North Dakota, Corey Bergsrud, Jeremy Straub, Robert Bernaciak, Subin Shahukhal, Benjamin Kading, Karl Williams, Hossein Salehfar, Johnathan McClure, James Casler, David Whalen, Elizabeth Becker, Sima Noghanian 2014 SelectedWorks

The Development Of A Nanosatellite-Class Sunsat At The University Of North Dakota, Corey Bergsrud, Jeremy Straub, Robert Bernaciak, Subin Shahukhal, Benjamin Kading, Karl Williams, Hossein Salehfar, Johnathan Mcclure, James Casler, David Whalen, Elizabeth Becker, Sima Noghanian

Jeremy Straub

This poster presents the details of work on the SunSat spacecraft design initiative at the University of North Dakota. This project seeks to advance technologies1 and to increase public awareness of Space Solar Power based via visualization, science and engineering work. It will also focus on the development and demonstration of a workable solution and consider the economic benefits2 that the proposed (and alternate) solutions may generate. This poster details the design project which will construct a transmitting Nano Space Solar Power Satellite (NSSPS) and a power reception satellite for a space-to-space Microwave Wireless Power (MWP) demonstration. The SmallSatstyle spacecraft4 ...


The Path To Regulation Of Small Unmanned Aerial Vehicles In The United States, Jeremy Straub, Joe Vacek 2014 SelectedWorks

The Path To Regulation Of Small Unmanned Aerial Vehicles In The United States, Jeremy Straub, Joe Vacek

Jeremy Straub

This poster presents an overview of proposed regulations that are presented in [1] related to a re-vised approach to small Unmanned Aerial Vehicles (UAV) regulation in the United States. Prospective strategies for enhancing UAV regulation are consid-ered as is the pathway to develop and implement these regulations. The benefits of changing the UAV regulatory regime are discussed, on both a user/prospective user and societal scale.


The Use Of Solar Balloons At Und As A Low-Cost Alternative To Helium Balloons For Small Spacecraft Testing And Stem Education, John Nordlie, Jeremy Straub, Chris Theisen, Ronald Marsh 2014 SelectedWorks

The Use Of Solar Balloons At Und As A Low-Cost Alternative To Helium Balloons For Small Spacecraft Testing And Stem Education, John Nordlie, Jeremy Straub, Chris Theisen, Ronald Marsh

Jeremy Straub

Helium-filled latex weather balloons have been utilized for many years to carry small satellite prototypes and subsystems into the stratosphere to allow testing in a “near space” (stratospheric) environment. A variety of environmental factors similar to the space environment can be found in this region, such as a rarified atmosphere, increased thermal stress including very low temperatures, increased solar radiation, the necessity of remote command and control, tracking, and telemetering of data. While this method of flight testing has been well-proven, a recent increase in the price of helium has driven the cost of such test programs to much higher ...


An Overview Of The Hardware Designs Of The Openorbiter Program, Jeremy Straub 2014 SelectedWorks

An Overview Of The Hardware Designs Of The Openorbiter Program, Jeremy Straub

Jeremy Straub

This poster provides an overview of the hardware designs for the OpenOrbiter small spacecraft, including both missions in our two-phase mission design. The first mission will use a limited-configuration, limited-scope CubeSat which will develop and demonstrate UND’s capability to develop and launch a small spacecraft. It will also serve to inform the second mission through problems detected with included components, so that these can be corrected before the more robust phase-two mission is launched. The phase-two mission will feature the complete Open Prototype for Educational NanoSats (OPEN) design and will house a visual-light camera which will serve to collect ...


Openorbiter Operating Software, Dayln Limesand, Christoffer Korvald, Jeremy Straub, Ronald Marsh 2014 SelectedWorks

Openorbiter Operating Software, Dayln Limesand, Christoffer Korvald, Jeremy Straub, Ronald Marsh

Jeremy Straub

The operating software team of the OpenOrbiter project has been tasked with developing software for general spacecraft maintenance, performing mission tasks and the monitoring of system critical aspects of the spacecraft. To do so, the team is developing an autonomous system that will be able to continuously check sensors for data, and schedule tasks that pertain to the current mission and general maintenance of the onboard systems. Development in support of these objectives is ongoing with work focusing on the completion of the development of a stable system. This poster will present an overview of current work on the project ...


Educational Benefits To Participants In Small Spacecraft Development, Jeremy Straub 2014 SelectedWorks

Educational Benefits To Participants In Small Spacecraft Development, Jeremy Straub

Jeremy Straub

A key focus of the OpenOrbiter project has been identifying possible sources of educational benefit to student participants and ascertaining whether they have been received. To this end, we’ve asked participants what benefits they hope to attain, determined whether they attained them and measured increases in skills and abilities over the period of participation in the project. This poster provides an overview of all of the educational evaluation work performed to-date with regards to the OpenOrbiter project. It considers both the benefit of the particular project as well as the benefits of small spacecraft development work, in general, across ...


A Low-Cost Gps/Inertial Position Determination System For High Altitude Balloons, Spacecraft And Unmanned Aerial Systems, Tyler Leben, Jeremy Straub, Ronald Marsh 2014 SelectedWorks

A Low-Cost Gps/Inertial Position Determination System For High Altitude Balloons, Spacecraft And Unmanned Aerial Systems, Tyler Leben, Jeremy Straub, Ronald Marsh

Jeremy Straub

A low-cost system is needed to determine precise position and predict future location in flight and low-Earth orbit. One method to accomplish this task is to utilize an onboard GPS receiver. GPS units receive data from the GPS NAVSTAR constellation of 24 satellites in the form of a 37 byte ASCII text sent at 4800 baud called NMEA sentences. The standard is 1 HZ, which is one sentence per second, but can be more. Ideally, from this data a PVT (position, velocity, time) and altitude can be determined. This data is then transferred from the GPS module to a separate ...


Openorbiter Operating System Components: Development Of Software For Communications And Power Management, Michael Hlas, Calvin Littlebina, Dayln Limesand, Christoffer Korvald, Jeremy Straub, Ronald Marsh 2014 SelectedWorks

Openorbiter Operating System Components: Development Of Software For Communications And Power Management, Michael Hlas, Calvin Littlebina, Dayln Limesand, Christoffer Korvald, Jeremy Straub, Ronald Marsh

Jeremy Straub

This poster presents details on two areas of the development of the OpenOrbiter Operating Software, communications and power management. Communications are an essential part of any satellite. Communications allow us to send commands and receive information from the satellite. However communications presents us with some unique challenges. The satellite is orbiting the earth about every 90 minutes at very high speeds making it difficult to track it through the sky. We also have a very limited window when the satellite is overhead to communicate with it. Bandwidth is also very limited so what is sent and received during that time ...


An Overview Of Current Progress On The Openorbiter Project, Jeremy Straub 2014 SelectedWorks

An Overview Of Current Progress On The Openorbiter Project, Jeremy Straub

Jeremy Straub

This poster presents an overview of the work that has occurred over the last year on the OpenOrbiter project. The new two-phase ‘experience-building’ mission strategy is presented and discussed and overviews of the hardware/software configurations applicable to each mission are presented. Highlights from recent work across all areas of the project are included. An overview of student involvement over the course of the last year is also presented. Also discussed are the future plans for the project and a look forward to the next year and what progress and deliverables are expected. The pathway to an orbital launch and ...


Post-Failure Capacity Of Built-Up Steel Members, Matthew H. Hebdon 2014 Purdue University

Post-Failure Capacity Of Built-Up Steel Members, Matthew H. Hebdon

Purdue Road School

Mechanically fastened built-up steel members have long been known to possess internal member redundancy and, as a result, multiple load paths which can be exploited to increase their functional life. Internal redundancy provides the ability to resist total member failure in the event of a fracture of an individual component. However, there is little experimental data in the literature regarding post-fracture capacity in terms of strength and subsequent fatigue life. The experimental study currently underway will provide needed information on parameters that affect the ability of built- up members to arrest a fracture as well as the available remaining fatigue ...


Post-Fracture Capacity Of Railroad Flat Car Bridges, Teresa L. Washeleski 2014 Purdue University

Post-Fracture Capacity Of Railroad Flat Car Bridges, Teresa L. Washeleski

Purdue Road School

Railroad flatcars (RRFCs) are a convenient option to replace existing deteriorating bridge structures on low-volume roads. They are typically used as the bridge superstructure by placing two or more flatcars side-by-side to achieve the desired bridge width. Utilizing RRFCs as a bridge allows for rapid construction and greater cost savings compared to traditional practices. These benefits make them an attractive solution for rural communities in Indiana, as well as other states.

Uncertainty remains about the response under higher loads than could be easily achieved in the field and the level of redundancy of railroad flatcar bridges. Using RRFCs as bridges ...


The Use Of 3d Printing To Enable High Altitude Balloon Missions, Jeremy Straub 2014 SelectedWorks

The Use Of 3d Printing To Enable High Altitude Balloon Missions, Jeremy Straub

Jeremy Straub

The 3D printing technology allows the low-cost creation of structures based on user-defined configuration parameters. Unlike other plastic-forming technologies, there is no tooling cost related to the creation of a mold. Because of this, highly-customized structures can be created with a minimum production quantity of one, allowing adaptation to individual mission needs (for a single-HAB mission) or the change of the structure across a multi-unit run (e.g., to test various configurations or as part of a study requiring multiple payloads with different configurations).

This paper considers the mission possibilities enabled by the use of 3D printing for HAB structures ...


Extending The Orbital Services Model Beyond Computing, Communications And Sensing, Jeremy Straub 2014 SelectedWorks

Extending The Orbital Services Model Beyond Computing, Communications And Sensing, Jeremy Straub

Jeremy Straub

An orbital services model has previously been proposed which is conceptualized in terms of providing orbital services related to a remote sensing mission, typical of a sensornet (e.g., computing, communications and sensing services). This model, however, can be extended to support additional services provided in the orbital environment, which could become available in the near to mid-term future. Examples of these services include power (such as might be provided by a solar power satellite), physical servicing (such as described by the DARPA Phoenix project and others), orbital maneuvering or raising and actuation of other remote craft capabilities.

This paper ...


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