Engineering Commons^™

Evaluation Of The Mechanical Properties Of Aa 6063 Processed By Severe Plastic Deformation

Faculty of Engineering University of Malaya

In this study, the mechanical properties, including surface hardness, tensile strength, fatigue, and fretting fatigue behavior of AA 6063 processed by equal channel angular pressing as the most efficient severe shear plastic deformation (SPD) technique, were investigated. Following the SPD process, samples were subjected to heat treatment (HT), hard anodizing (HA), and a combination of HT and HA. Rotating-bending fretting fatigue tests were performed to explore the samples' response to the fretting condition. From the experimental fatigue and fretting fatigue tests, it was apparent that the SPD treatment had a positive effect on enhancing the fatigue and fretting fatigue lives …

Influence Of Ultrasound Power On Acoustic Streaming And Micro-Bubbles Formations In A Low Frequency Sono-Reactor: Mathematical And 3d Computational Simulation

Faculty of Engineering University of Malaya

This paper aims at investigating the influence of ultrasound power amplitude on liquid behaviour in a low-frequency (24 kHz) sono-reactor. Three types of analysis were employed: (i) mechanical analysis of micro-bubbles formation and their activities/characteristics using mathematical modelling. (ii) Numerical analysis of acoustic streaming, fluid flow pattern, volume fraction of micro-bubbles and turbulence using 3D CFD simulation. (iii) Practical analysis of fluid flow pattern and acoustic streaming under ultrasound irradiation using Particle Image Velocimetry (Ply). In mathematical modelling, a lone micro bubble generated under power ultrasound irradiation was mechanistically analysed. Its characteristics were illustrated as a function of bubble radius, …

Synergistic Sonoelectrochemical Removal Of Substituted Phenols: Implications Of Ultrasonic Parameters And Physicochemical Properties

Faculty of Engineering University of Malaya

The effects of ultrasonic conditions and physicochemical properties on the synergistic degradation in synthetic solution were investigated. A wide range of ultrasound frequencies, including 35, 170, 300, 500 and 700 kHz, and ultrasonic power densities, including 11.3, 22.5 and 31.5 W/L were used. It was revealed that the physical effect of ultrasound plays a major role in synergistic mechanism and 35 kHz was found to be the most effective frequency due to its more vigorous physical effect induced by high implosive energy released from collapse of cavitation bubbles. The highest ultrasonic power density (31.5 W/L) showed the highest synergy index …

The Tribological And Electrochemical Behavior Of Hvof-Sprayed Cr3c2-Nicr Ceramic Coating On Carbon Steel

Faculty of Engineering University of Malaya

High Velocity Oxygen Fuel (HVOF) is an excellent approach to prepare a good, wear-resistant lamella of Chromium Carbide-Nickel Chrome (Cr3C2-NiCr) on carbon steel for high temperature application. This research investigates the effect of a thin, deposited layer of Cr3C2-NiCr on carbon steel in terms of wear and corrosion properties. The microstructure of the HVOF-sprayed Cr3C2-NiCr coating was characterized at each step by scanning electron microscopy. Wear testing was performed with a pin-on-disk tester. Wear weight loss was examined by applying different loads over a 9048.96 m sliding distance. Experimental results show that the wear resistance of the coated sample reduced …

Living Wall (Vertical Greening): Benefits And Threats, Mehdi Rakhshandehroo, Mohd Johari Mohd Yusof, Roozbeh Arabi

mrakhshandehroo@yahoo.com

Sustainable development demands a significant approach between architecture and the environment. During the challenge of climate change, energy crisis and urban expansion, a new approach is required to address environmental problems and one of these approaches is vertical greening that can be categorized into green facade and living wall. Living wall systems (LWS) consist of plants and partly growing materials that have a number of beneficial functions, for example: increasing the outdoor and indoor comfort, ecological value, biodiversity, insulation properties, improvement of air quality mitigation of the urban heat island phenomenon, and psychological and social well-being of citizens. This paper …

Green Façade (Vertical Greening): Benefits And Threats, Mehdi Rakhshandehroo, Mohd Johari Mohd Yusof, Meysam Deghati Najd

mrakhshandehroo@yahoo.com

In the challenge of development in dense urban areas and environmental preservation, sustainability is a significant requirement where green facade (vertical greening) is one of those approaches that flourished during the last decade although it is not a new concept. Hanging or vertical garden, vertical vegetable farms, balcony garden, container or planter box greening, green or eco building, green roof or rooftop garden, wall planter, and green envelop are all different aspects of this idea that demonstrate how wide this landscape can be. Greening the building envelope with vegetation can be used as a mean to restore the environmental conditions …

Changes In Heavy Rainstorm Characteristics With Time And Temperature, Barry A. Palynchuk Phd, Yiping Guo Phd

Barry A. Palynchuk PhD

The effects of climate change upon extreme rainfall is evaluated, based upon the identification of individual storms, and the changes in their statistical parameters and distributions. Those changes will be measured based upon historical time spans, and climatic temperature associated with the events. A brief review and comparison with other research is provided.

Changes In Heavy Rainstorm Characteristics With Time And Temperature - Presentation, Barry A. Palynchuk Phd

Barry A. Palynchuk PhD

The effects of climate change upon extreme rainfall is evaluated, based upon the identification of individual storms, and the changes in their statistical parameters and distributions. Those changes will be measured based upon historical time spans, and climatic temperature associated with the events. A brief review and comparison with other research provided.

Unikl Outstanding Achievement In I-Envex 2015, Azman Ismail

Azman Ismail

No abstract provided.

Consideration Of The Use Of An Origami Style Solar Panel Array For A Space Solar Power Generation Satellite, Landon Klein, Tristan Plante, Alex Holland, Benjamin Kading, Jeremy Straub, David Whalen

Jeremy Straub

Since the beginning of the space race, space exploration has been an important part of America’s technological develop-ment. The notion of a power-intensive [1] mission to Mars, which utilizes 3D printing has been proposed. Space Solar Power can supply energy for this mission. This paper presents an Origami solar panel, based on work by [2], that can supply power to an outpost on Mars.

Supervisory Control And Data Acquisition (Scada) Control Optimization, Garrett Johnson, Jeremy Straub, Eunjin Kim

Jeremy Straub

SCADA systems are generally used to monitor and control multiple systems of the same type to allow them to be remotely controlled and monitored. Water plants, for example, could be controlled and monitored by a SCADA system. This project seeks to optimize a SCADA system using Artificial Intelligence. A constraint satisfaction / optimization algorithm is used to maximize performance relative to weighted system goals.

Consideration Of The Use Of A Space Solar Power Satellite System For A Manned Mars Mission, Benjamin Kading, Jeremy Straub, Tristan Plante, Alex Holland, Jordan Forbord, Landon Klein, David Whalen

Jeremy Straub

The design of a manned Mars mission has been a point of ongoing interest . Numerous Mars missions have been proposed and designed but major roadblocks impair their completion. Primarily, these issues are related to cost and safety concerns. However, many technologies have been developed and are being developed to make a Mars mission more feasible. One such technology is Space So- lar Power. (SSP) SSP technology involves generating power in space from the sun and beaming it via microwave radia- tion to a ground site for use. This method has immediate usability on Mars due to the minimal atmosphere, …

Scheduling Algorithm Development For An Open Source Software And Open Hardware Spacecraft, Calvin Bina, Jeremy Straub, Ronald Marsh

Jeremy Straub

The efficacy of each type of scheduler is assessed rela-tive to the goal of having a time and resource efficient scheduling algorithm. The scheduler must ensure suc-cessful spacecraft operations and maximize the perfor-mance of tasks relative to performance constraints and their respective due dates.

Assessment Of The Impact Of Clothing And Environmental Conditions On Visible Light 3d Scanning, Pann Ajjimaporn, Jeremy Straub, Scott Kerlin

Jeremy Straub

The quality of models produced by visible light 3D scanners is influenced by multiple factors. To max-imize model accuracy and detail levels, the correct combination of lighting texture, subject posture and software usage must be selected. The work described herein has been performed to measure the effect of different lighting and envi-ronmental conditions on human 3D scanning results.

Design And Analysis Of A Mars Supply Spacecraft, Tristan Plante, Alex Holland, Landon Klein, Jordan Forbord, Benjamin Kading, Jeremy Straub, David Whalen

Jeremy Straub

This poster considers one part of a space solar power-based mission to sup-ply wireless power for use on the Mar-tian surface. It presents a cargo capsule designed to house the necessities for human survival, as well as research equipment , and safely deliver them to a predetermined destination on Mars.

Design Of An Electrical Power System For The Openorbiter Cubesat, Sofiane Chaieb, Michael Wegerson, Jeremy Straub, Ronald Marsh, David Whalen

Jeremy Straub

The OpenOrbiter Small Spacecraft Development Initiative aims to create an Open Prototype for Educational Nanosats (OPEN) framework (see [1]) for a complete 1-U CubeSat (10 cm x 10 cm x 10 cm, 1.33 kg spacecraft) with a total parts cost of less than $5,000 [2]. In order to supply all spacecraft subsystems with power, an electrical power system (EPS) has been implemented. The EPS generates power using multiple solar panels, stores it in batteries and regulates it to provide continuous levels of power to all of the subsystems of the spacecraft. The EPS has a crucial role in the spacecraft …

Scada System Security: Accounting For Operator Error And Malicious Intent, Ryan Kilbride, Jeremy Straub, Eunjin Kim

Jeremy Straub

Supervisory control and data acquisition (SCADA) systems are becoming more and more com-monplace in many industries today. Industries are making better use of software and large scale control systems to run efficiently, without the need for large amounts of oversight. Security is a particularly large issue with such systems, however. A human must still be involved to ensure smooth operation in the event of catastrophic system error, or unusual circumstanc-es. Human involvement presents problems: operators could make mistakes, configure the system to operate sub-optimally or take malicious actions. This imple-mentation of SCADA security aims to combat these problems.

Autonomous Navigation And Control Of Unmanned Aerial Systems In The National Airspace, Michael Hlas, Jeremy Straub, Eunjin Kim

Jeremy Straub

Pilotless aircraft known as Unmanned Aerial Vehicles (UAVs) have been used extensively for military and intelligence purposes. This includes situations where the mission area is too dangerous for a pilot to fly, the length of the mission is longer than a pilot could stay awake or aircraft are used as cruise missiles that crash into their target. With the decreasing cost and miniaturization of computers, it has become possible to build UAVs that are small and inexpensive making them accessible to businesses, law enforcement, hobbyists and the general public.

Cubesat Deployable Solar Panel System, Thomas Mcguire, Skye Leake, Michael Parsons, Michael Hirsch, Benjamin Kading, Jeremy Straub, David Whalen

Jeremy Straub

CubeSats are small spacecraft with a nominal size of 10 cm x 10 cm x 10 cm and a mass of 1.33 kg [1] (though some launch providers are now supporting expanded mass levels). While the CubeSat form factor has re-duced the time and cost of spacecraft development, the required resources are still beyond the grasp of many colleges and universities. The Open Prototype for Educational Nanosats (OPEN) aims to solve this problem. OPEN is an inexpen-sive modular CubeSat that can be produced with a parts budget of less than $5,000 [2]. The OpenOrbiter pro-gram is working to develop this …

Pattern Recognition And Expert Systems For Microwave Wireless Power Transmission Failure Prevention, Cameron Kerbaugh, Allen Mcdermott, Jeremy Straub, Eunjin Kim

Jeremy Straub

Wireless power transfer (WPT) can be used to deliver space-generated power to ground stations through the use of microwave beams. WPT satellite power delivery systems have two major failure states: misdi-recting a beam and failing to send power to a station. This project has implemented an expert system to perform pattern recognition in an effort to prevent failures by analyzing the system state and predicting potential failures before they happen in support of space-based testing [1] and deployment [2].

Design Concept For A Power Generating Satellite For A Manned Mars Mission, Alex Holland, Tristan Plante, Jordan Forbord, Landon Klein, Benjamin Kading, Jeremy Straub, David Whalen

Jeremy Straub

Once proposed work in low-Earth orbit [1] to demonstrate the efficacy of wireless power transmis- sion is a mission is completed, an additional step is needed before the technology is sufficiently tested for use on Earth. A Martian mission (such as [2]) is pro- posed to allow the demonstration of the use of the wireless power transmission technology in support of and proximity to human astronaut operations.

This poster presets a satellite concept intended for use on this Mars mission, to supply power that is need- ed for human habitation and other purposes. This satel- lite is designed to be …

Pattern Recognition For Detecting Failures In Space Solar Power Systems, Allen Mcdermott, Cameron Kerbaugh, Jeremy Straub, Eunjin Kim

Jeremy Straub

This poster covers work relating to the use of expert systems and pattern recognition to attempt to identify, detect and prospectively stop patterns of activity that could potentially lead to failure of a space solar power (SSP) system. A database-based expert system has is presented to identify patterns, which can be used to determine whether a power beam could hit a unintend- ed target and potentially cause a calamity. This has been implemented via a facts-rule network via which supplied and collected facts and a rule set is used to de- termine whether the system is operating correctly (from a …

تمرین های فصل چهارم, Hadi Zayandehroodi

Dr. Hadi Zayandehroodi

تمرینهای فصل چهارم - کتاب ارزیابی قابلیت اطمینان سیستم های مهندسی - نوشته دکتر محسن رضائیان

قابلیت اطمینان-بخش دوم, Hadi Zayandehroodi

Dr. Hadi Zayandehroodi

قابلیت اطمینان یک مشخصه ذاتی از هر محصول و یکی از پارامترهای طراحی محسوب می شود

A Software Defined Radio Communications System For A Small Spacecraft, Michael Hlas, Jeremy Straub, Ronald Marsh

Jeremy Straub

Software defined radios (SDRs) are poised to significantly enhance the future of small spacecraft communications. They allow signal processing to be performed on a computer by software rather than requiring dedicated hardware. The OpenOrbiter SDR (discussed in [1] and refined in [2]) takes data from the flight computer and converts it into an analog signal that is transmitted via the spacecraft antenna. Because the signal processing is done in software, the radio can be easily reconfigured. This process is done in reverse for incoming transmissions, which are received by the SDR and decoded by software. Figures 1 and 2 provide …

An Onboard Distributed Multiprocessing System For A Cubesat Spacecraft Created From Gumstix Computer-On-Module Units, Michael Wegerson, Jeremy Straub, Ronald Marsh

Jeremy Straub

The OpenOrbiter Small Spacecraft Development Initiative at the University of North Dakota [1] aims to make ac-cess to space for research and educational purposes easier by enabling the creation of low-cost CubeSats. It is creating the Open Prototype for Educational Nanosats (OPEN), a framework for developing a 1-U CubeSat space-craft with a parts cost of less than $5,000 [2]. The designs [3], documentation and computer code from this will be made publically available to enable the development of programs at other institutions.

The Use Of Low-Cost ‘Balloonsats’ For Stem Education With 3d Printing, Jeremy Straub, Josh Berk, John Nordlie, Ronald Marsh

Jeremy Straub

A new technology, known as 3D printing, allows the rap-id fabrication of plastic structures of virtually any config-uration. These structures are light-weight, dura-ble and inexpensive. This paper considers the utility of utilizing 3D printing to create enclosures for ‘BalloonSats’ – small, low-cost spacecraft analog which can be utilized by students to understand space engi-neering, conduct near-space science (e.g., physics, bio-logical and other experiments) and touch the edge of space.

Considering Scheduling Algorithms For An Open Source Software Spacecraft, Calvin Bina, Jeremy Straub, Ronald Marsh

Jeremy Straub

The OpenOrbiter Small Satellite Development Initiative at the University of North Dakota [1] is working make space research and education more accessible world-wide [2], through the design and public release of a complete set of plans, software and other documents (see [3]) for a 1-U CubeSat. This design targets a parts cost of no more than $5,000 [4]. These lowered costs, combined with the efficiencies of the CubeSat form fac-tor [5] and free-to-qualified-developer launch services [6, 7] should facilitate greater access to space for the ed-ucational, research and other communities.

Work Done On The Operating Software For Openorbiter, Dayln Limesand, Timothy Whitney, Jeremy Straub, Ronald Marsh

Jeremy Straub

The OpenOrbiter Program aims to develop a tem-plate for a CubeSat spacecraft that can be used world-wide to reduce spacecraft development costs1. Unlike other approaches, which may require $50,000 in upfront hardware costs2 or $250,000 in design expenses2, an OPEN-class spacecraft can be built with a parts budget of under $5,0003. This aims to enable low-cost educa-tional missions and missions in developing regions4.

Designing An Intelligent Attitude Determination And Control System (Adcs), Michael Wegerson, Matt Partridge, Nathan Crocker, David Schindele, Broc Friend, Levi Lewis, Ben Johnson, Jeremy Straub, Ronald Marsh

Jeremy Straub

CubeSat spacecraft have been shown to provide significant cost [1], research [1] and educational benefits [2]. Prior work at UND has demonstrated the efficacy of this form factor of craft for asteroid as-sessment activities [3] and onboard image processing [4]. Work is al-so ongoing to develop a low-cost framework [5] for CubeSat devel-opment to enable activities at UND and at other locations.