Papers by Yasser Al Hamidi
Hamidi holds a Ph. D. degree in Mechatronics from the University of Bourgogne Franche-Comté (UBFC... more Hamidi holds a Ph. D. degree in Mechatronics from the University of Bourgogne Franche-Comté (UBFC), France, and currently working as the Mechanical Engineering Laboratories Manager at Texas A&M University at Qatar. He joined Texas A&M University at Qatar in 2007 coming from University of Sharjah. Dr. Al-Hamidi had been appointed as a visiting lecturer in 2018 to teach design related courses in the mechanical engineering program. He specializes in product design, instrumentation, controls, and automation. Dr. Al-Hamidi founded the Engineering Enrichment Program in 2016, which is currently one of the Center for Teaching and Learning pillars. He received three Transformative Engineering Education grants related to multidisciplinary education in 2018, 2021 and 2022. In 2021 Dr. Al-Hamidi received the Dean's Achievement Award to recognize his contribution to the campus within that year. In 2015 he received the Association of Former Students AFS Distinguished Achievement Award as a recognition for his commitment, performance and positive impact on Aggie students. And in 2010, he received the STAR award as a recognition for his outstanding service and achievement at Texas A&M at Qatar.
Journal of Pediatric Urology
Les actionneurs multi-axes sont de plus en plus prisés par les concepteurs de systèmes de nanopos... more Les actionneurs multi-axes sont de plus en plus prisés par les concepteurs de systèmes de nanopositionnement car ils permettent une réduction de l'espace occupé et de l'énergie consommée, une dextérité plus grande et une modularité avec peu de contraintes pour les applications. Certains de ces actionneurs et systèmes multi-axes sont cependant caractérisés par des oscillations mal-amorties qui compromettent de manière drastique leurs performances générales. Cette thèse concerne l'exploitation des techniques de commande en boucle-ouverte input-shaping classiquement utilisées pour amortir de manière sans capteurs les oscillations dans les systèmes mono-axes et les étendent pour qu'ils soient utilisables pour les systèmes multi-axes. Les résultats proposés dans la thèse qui sont des techniques input-shaping multivariables sont ensuite appliquées sur des actionneurs piézoélectriques classiquement dédiés pour les applications de nanopositionnement.Multi-axes actuators are ...
Fast predictive control for air-fuel ratio of SI engines using a nonlinear internal model
International Journal of Engineering, Science and Technology, 2011
Volume 9: Engineering Education
This paper presents a product design journey for a group of undergraduate sophomore university st... more This paper presents a product design journey for a group of undergraduate sophomore university students as part of their Geometrical Modeling for Mechanical Design course. The course project aimed to help students to use basic process of engineering design, use a computer aided design (CAD) tool to model their product, engineering analysis tools to evaluate their design, and understand the need for prototyping. The students started their journey with ideas tournament to select an outstanding idea which would be of a great market value. After intensive consultation with the course instructor and implementing a stringent selection criterion, students chose to design a novel tool changer that incorporates two different grippers with varying performance specifications. The students followed a systematic approach that got them involved in doing very thorough literature review in which they classified most of the grippers and tool changers available in the market. They also sensed how the...
ASME 2019 17th International Conference on Nanochannels, Microchannels, and Minichannels, 2019
The objective of this paper is to study the effect of multiple jet impingements on one another in... more The objective of this paper is to study the effect of multiple jet impingements on one another in a heat sink under adiabatic conditions. The jet impingement is a unique design which aimed to optimize the cooling performance of a concentrated photovoltaic cell. The paper is based on the design and fabrication of a new 9-celled test section. Initially, to set a baseline, individual cells in the 9-celled test section were tested alone in order to observe their flow regimes. These tests were completed by applying varying water cross flow rates to a set air-water mass flow rate exiting the jet impingement. Afterwards, two cells were tested in conjunction with one another under similar conditions. The location of the cells tested had been varied in order to observe how different cells interact with another. Plug flow and bubbly flow were consistently found through the various experiments. In general, it was noticed at higher crossflow rates the bubble sizes and quantity would decrease dr...
This paper aimed to study two-phase flow under adiabatic conditions through the process of flow v... more This paper aimed to study two-phase flow under adiabatic conditions through the process of flow visualization. This was done through the use of a test section with a cross flow and a jet impingement (swirl jet). The flow regimes under different air-water flow rates were determined using a high-speed camera that recorded digital videos. For each of the flow rates the pressure differential between the inlet and the outlets were measured. Through the pressure drop it is proposed that the types of flow regimes may later be able to be predicted. Nine air-water flow rates were considered to collect data and generate a flow map for the impingement jet and cross flow. The major observed flow regimes within the crossflow and impingement jet followed the predicted trend with bubbly and plug flow in the former, and slug flow in the latter. It was further observed that increasing the air flow rate increased the likelihood of bubbly and plug flow in both the cross-flow and impingement jet. In the cross flow, a lower air flow rate resulted in bubbly flow while within the impingement jet, a lower air flow rate resulted in slug flow.
Multi-axes actuators are becoming more and more tempting to nanopositioning system designers as t... more Multi-axes actuators are becoming more and more tempting to nanopositioning system designers as they enable them to save space, reduce energy consumption, increase dexterity and offer more modularity and freedom with fewer constraints to their applications. Some of these multi-axes actuators and systems exhibit however badly damped vibrations which strongly compromise their global performances. This thesis work exploits the advantages of the well-known feedforward input shaping techniques usually used to damp vibrations in monovariable (SISO) systems to present a new multivariable (MIMO) input shaping technique that can be used to damp vibrations in multi-axes systems. The approach that was used in this study is to extend a previous work that was done on multiple-input single-output (MISO) systems and generalize it for MIMO systems. The study demonstrates also the application of this newly developed technique on different piezoelectric actuators commonly used in nanopositioning syst...
Virtual Endoscopy and 3D Reconstruction in the Airways, 2019
The advancement of rapid manufacturing technologies known as 3-D printing is transforming several... more The advancement of rapid manufacturing technologies known as 3-D printing is transforming several medical practices and solutions. In contrast to traditional mass production technologies of manufacturing, 3-D printing prevails in terms of low-volume production cost saving, introducing flexibility and personalization. This means that the manufacturer can change the design of the produced parts at will, without the time and effort associated with tooling change in other production methods. Furthermore, 3-D printing has a better ability of producing models with complex geometries, such as the patient-specific anatomical models.
Crude oil pipelines are always at risk of failing as a result of cracking or corrosion. Failing p... more Crude oil pipelines are always at risk of failing as a result of cracking or corrosion. Failing pipelines can be hazardous to personnel, damaging to the environment, and extremely costly. This makes it essential that all pipelines have a schedule of inspection and maintenance. Robots that inspect pipelines from the outside are preferable to ones that work from the inside, because they can undertake inspections without causing any disruption to production processes and can be put to work at any point of the pipeline. Nevertheless, external robots and associated machinery have several challenges and limitations. This research proposes the design, fabrication, and testing of a novel climbing robot that incorporates a drone-like means of propulsion. The purpose of this robot will be to undertake detection of external defects and to monitor the health of the horizontal and vertical pipelines. This climbing mobile robot is intended to assist the production of new system that will improve ...
2017 ASEE Annual Conference & Exposition Proceedings
A gas turbine is an internal combustion engine that converts natural gas or other liquid fuels to... more A gas turbine is an internal combustion engine that converts natural gas or other liquid fuels to mechanical energy, to drive generators or to provide the energy in water desalination or in petrochemical plants. Jet engines are gas turbines optimized to produce thrust from the exhaust gases. The design of jet engines involves all of the fields of mechanical engineering, but thermodynamics, heat transfer and vibrations are of particular importance to the engine design. In this paper, we present the work done by a group of senior mechanical engineering students as part of their MEEN 404 experiment design course project. Students were asked to slightly modify an open-source simplified jet engine CAD model for 3D printability, build and test the 3D printed functional model in different compressor and turbine configurations. For that, the students had to go through the entire design process, from functions through requirements, through alternative designs to be able to integrate the newly modified parts into their testbed. They had to equip the system with all the necessary sensors and instrumentation to control and monitor the engine while conducting many tests to study the cost, efficiency, and performance over a range of parameter values and environmental conditions such as the number of blades, blade angle of attack, and outlet nozzle size. This project was a good tool to promote student's engagement and development, advance their critical thinking, and improve their problem solving and leadership skills. The project was also of a great help to students in understanding many mechanical engineering topics covered in other classes, especially after being complemented by a workshop hosted by General Electric (GE) at Qatar Science and Technology Park, where students received a hands-on training session on regular maintenance work carried out on aircraft engines.
2018 ASEE Annual Conference & Exposition Proceedings
2017 ASEE Annual Conference & Exposition Proceedings
where he is currently an Associate Professor. His research interests include biomedical engineeri... more where he is currently an Associate Professor. His research interests include biomedical engineering, condition monitoring, and machine fault diagnosis.
MATEC Web of Conferences
Thermoelectric generator (TEG) while offering the advantage of operational reliability are constr... more Thermoelectric generator (TEG) while offering the advantage of operational reliability are constrained by limited efficiencies. This paper, which is from an undergraduate research project, focusses on the contribution of cold side thermal management of commercially available thermoelectric generators towards the thermal to electrical conversion efficiency for a range of hot side temperatures. Electric heating elements are used to vary the heat flux to the TEG while conventional active and passive methods employing air and water as a medium are used for dissipating heat from the cold side of TEGs. Both thermal and electrical performance parameters of the TEGs are recorded for various ambient conditions in an indoor facility corresponding to naturally occurring wind conditions. At the end, the utility and effectiveness of the cooling methods are quantified for the range of operating temperatures.
Sensors for Next-Generation Robotics III, 2016
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Papers by Yasser Al Hamidi