Mechanical Engineering Commons^™

Exploring The Role Of Education In Addressing The Skills Gap For Seafarers In Bangladesh's Maritime Industry, Fatema Tuz Tahera

World Maritime University Dissertations

No abstract provided.

Harnessing Multimodal Sensory Feedback: An Exploration Of Rhythmic Asymmetric Cues In Gait Rehabilitation, Scott J. Bartlett Jr.

USF Tampa Graduate Theses and Dissertations

Stroke remains a leading cause of long-term disability, with survivors often facing challenges in mobility, particularly gait asymmetry. This adversity not only diminishes the quality of life but also imposes substantial socioeconomic burdens. Current rehabilitation methods are somewhat effective yet exhibit a dire need for augmentation to better address gait abnormalities. The novel introduction of Auditory Rhythmic Asymmetric Cues, Tactile Rhythmic Asymmetric Cues, and their simultaneous combination (A-RAC, T-RAC, and AT) offers a fresh perspective toward gait rehabilitation, aimed at taking steps to alleviate the adversities borne by stroke survivors. This study provides a thorough investigation of these asymmetric cues, …

Application Of Wind Propulsion In The Existing Fleet Of The Caspian Sea Using Real Wind Data, Mahmud Suleymanli

World Maritime University Dissertations

No abstract provided.

Mining Multibeam Transit Data For Deep Ocean Polymetallic Nodules: Case Study In Se Pacific Ocean, Mark E. Mussett

USF Tampa Graduate Theses and Dissertations

Occurrences of nodules on the seafloor represent benthic habitats and present potential deposits of economically important metals. Better understanding their extent throughout Earth’s oceans will aid in resource management and determining different factors which influence their formative factors and respective local characteristics. Multibeam bathymetry and backscatter data, along with auxiliary data suggest an area of seafloor near the Foundation Seamount chain in the southern Pacific Ocean, centered around -36.84° latitude, -119.75° longitude, contains a previously uncharted polymetallic nodule occurrence. Our analysis of Simrad EM12 DUAL (12 kHz) multibeam data, collected during a 1997 transit, shows an area of strong backscatter …

Knowledge Integration In Domain-Informed Machine Learning And Multi-Scale Modeling Of Nonlinear Dynamics In Complex Systems, Phat K. Huynh

USF Tampa Graduate Theses and Dissertations

Nonlinear dynamical systems have been extensively used to model various phenomena in the changing world around us, especially in science and engineering fields. Thanks to breakthrough advancements in sensing technologies, an increasingly high volume of multi-modal sensor data has been collected, which enables us gain better insights into complex systems dynamics and build sophisticated data-driven machine-learning-based dynamic models without having the access to the underlying governing equations. However, integrating domain-specific knowledge in machine learning algorithms remains pivotal for various reasons: it promises enhanced predictive accuracy, better model interpretability, and increased generalizability. This dissertation delves into three core research questions, each …

Structural Health Monitoring And Repair Of Welded Thermoplastic Composite Joints Using Embedded Multifunctional Films, Wencai Li

LSU Doctoral Dissertations

Thermoplastic composites (TPCs) have gained widespread use, particularly in large or integrated structural components, necessitating effective joining techniques. Fusion bonding (welding) has emerged as a suitable method for TPCs due to their ability to be reshaped through heating and cooling, eliminating the need for mechanical fasteners, long curing times, and extensive surface preparation. Among the welding techniques, ultrasonic welding (USW) stands out for its fast-cycling time and potential for automating large-scale structures, thereby reducing energy consumption. However, limited industrial applications of USW in this context require further knowledge to instill confidence in the process. Moreover, composite structures are susceptible to …

Steerable Acoustically Powered Starfish-Inspired Microrobot, Cornel Dillinger, Justin Knipper, Nitesh Nama, Daniel Ahmed

Department of Mechanical and Materials Engineering: Faculty Publications

Soft polymeric microrobots that can be loaded with nanocargoes and driven via external field stimuli can provide innovative solutions in various fields, including precise microscale assembly, targeted therapeutics, microsurgery, and the capture and degradation of unwanted wastewater fragments. However, in aquatic environments, it remains challenging to operate with microrobotic devices due to the predominant viscous resistances and the robots’ limited actuation and sensing capabilities attributed to their miniaturization. The miniature size prevents the incorporation of onboard batteries that can provide sufficient power for propulsion and navigation, necessitating a wireless power supply. Current research examines untethered microrobot manipulation using external magnetic, …

Influence Of Technological Parameters On Chip Formation And Chip Control In Precision Hard Turning Of Ti-6al-4v, Elshaimaa Abdelnasser, Samar El-Sanabary, Ahmed Nassef, Azza Barakat, Ahmed Elkaseer

Mechanical Engineering

This article presents the results of an experimental investigation into the effect of process parameters in the precision hard turning of Ti-6Al-4V on chip morphology at both macro and micro levels. It also reports on the control of chip generation to improve chip evacuation and breakability at the macro level by varying the process parameters, namely, feed rate, cutting speed and depth of cut during turning tests. A scanning electron microscope (SEM) was used to examine the chips produced for a better understanding of chip curling mechanisms at the micro level. Surface roughness of the machined specimens was measured to …

Development Of Surrogate-Optimization Models For A Novel Transcritical Power Cycle Integrated With A Small Modular Reactor, Yili Zhang, Jacob Bryan, Geordie Richards, Hailei Wang

Mechanical and Aerospace Engineering Student Publications and Presentations

In recent years, various types of surrogate optimization models have been proposed to reduce the computational time and to improve the emulation accuracy. In this study, by leveraging an ANN surrogate model developed earlier, a comprehensive and efficient optimization algorithm is conceived for the global optimal design of an integrated regenerative methanol transcritical cycle. It combines a unique converging/diverging classifier model into the surrogate model to form a surrogate-based model, which significantly improves the prediction accuracy of the objective function. Six binary classifiers are explored and the multi-layer feed-forward (MLF) neural network classifier is selected. In addition, within the five …

Effect Of Fire Flame On Some Mechanical Properties Of Self-Compacting Concrete, Haider Sadiq M. Ali, Nabeel A-M. Albayati, Basman R. Mohammed, Adil M. Jabbar

Al-Esraa University College Journal for Engineering Sciences

This paper presents an experimental investigation of the effect of fire flame on self-compacting concrete. The experimental program included casting cylinder and prism concrete specimens for compressive strength, modulus of elasticity, modulus of rupture, and concrete density tests. The specimens are exposed to fire flame at 800 ºC approximately for 2 hours or 6 hours. Then the specimens were cooled either in a fast or slow manner. Test results show that the compressive strength was reduced by about (54 - 61)% for fire exposure of 6 hours and by (27 - 37)% for 2 hours of exposure and cooled slowly …

Manual Preparation Of Eyeglasses Based On Corneal Topographical Images For Keratoconus Patients, Bassma Sabah Majeed, Faiz F. Mustafa, Nebras H. Ghaeb

Al-Esraa University College Journal for Engineering Sciences

keratoconus (KCN) is a non-inflammatory, progressive thinning process of the cornea. It is considered one of the advanced biomechanical changes on the corneal surface, and methods of treatment in late cases are special designed contact lenses or surgical intervention. The objective of this paper is to customize the standard eyeglass lens in a way so that it fits with the abnormal shape and changes of the surface of the cornea of a patient suffering from KCN disease.The proposed method here, based on manual scratching of the external surface of the standard eyeglass lens under supervising of an expert optometrist, where …

Age-Friendly Educational Buildings Primary Schools In Kerbala - A Case Study, Anwar Fadhil Hussein, Ibrahim Jawad Kadhim

Al-Esraa University College Journal for Engineering Sciences

The concept of age-friendly societies has gained international attention among researchers, policy makers, and community organizations since the World Health Organization launched the Friendly Communities Project in 2006, to address challenges in some countries, as these challenges affect all aspects of society, and the educational environment represents an important joint of those joints, being the environment that is the most effective and influential in shaping human behavior. The age stage that is most affected and capable of learning and shaping behavior is of importance, which is the childhood stage. Therefore, the research focused on school buildings, as they represent an …

The Role Of Enhancing Interaction With The Natural Environment In Achieving Social Interaction For Children In Orphanage Institutions, Shamael M. W. Al Dabbagh, Zainab Khalid Rashad Al Khafaji

Al-Esraa University College Journal for Engineering Sciences

The child deprived of family care is considered the child most in need of attention and care. When the orphan child enters a new environment for him, it is obvious that he feels alienated, isolated, and loses the sense of interaction and communication with society. The research sees the possibility of mitigating this feeling by enhancing interaction with the natural environment within the internal spaces of the orphanage building and at the neighborhood level. In order to solve the research problem, the research adopted a hypothesis stating that "interaction with the natural environment enhances the achievement of social interaction for …

The Role Of Academic Competitions In Promoting Architectural Education: Tamayouze Excellence Award In Iraqi Architectural Education - Case Study, Nairy Mugardich Krikor, Anwar Subhi Ramadan

Al-Esraa University College Journal for Engineering Sciences

The importance of architectural competitions has emerged in finding the best designs, upgrading and architectural advancement in both practice and thinking. Architectural competitions have become intellectual meetings that contribute to stimulating self-learning and encouraging creativity. They act as an educational tool that leads to competition, giving motivation to the development of skills and learning, in a way that enhances the integration between architectural theory and practical practice for both engineers and architecture students. The research was concerned with studying the effective role of academic competitions in architectural education as one of the ways to improve teaching and learning, and to …

Analysis And Mitigation Of Cyber-Attacks Targeting Infrastructures Operated By Iot Systems, Raja Salih Mohammed Hasan, Nadia Mahmood Ali, Ihsan Jabbar Hasan

Al-Esraa University College Journal for Engineering Sciences

Numerous countries have a high impact on providing the planet with critical infrastructures offering very important services employed in different fields such as water resources management, public services, power grids, telecoms, commercials, and transportation. The increasing solutions in IoT systems made it possible to exploit internet connection services for supporting the critical infrastructures. The latest are being targeted by various types of cyber-attacks due to the advancement in internet services. Therefore, improving the security systems and the ways to detect the threats is highly required. Meanwhile, protecting the critical infrastructures from hostile cyber-attacks is of high significance. This article examines …

Reliability Assessment Model Of Network Operating System Based On Convolution Neural Network, Jamal N. Hasoon, Sarah S. Qasim, Mohammed A. Alshomali, Jane J. Stephan

Al-Esraa University College Journal for Engineering Sciences

The paper's subject is one of the points of fundamental significance in improving the development of complex computer systems is the effect of errors since their probability of occurrence in a widely distributed system is exceptionally high. Thus, the computer system must be dependable and provide comprehensive support for fault tolerance, fault detection, signal recovery mechanisms, failure prediction, etc. The goal is to develop a way to evaluate the reliability of the Red Hat Linux operating system utilizing data sets of system failures obtained from system injection with error reports using the Fault Injection Benchmarking and Reliability) FIBR( (for a …

Transepithelial Electrical Impedance Increase Following Porous Substrate Electroporation Enables Label-Free Delivery, Justin R. Brooks, Tyler C. Heiman, Sawyer R. Lorenzen, Ikhlaas Mungloo, Siamak Mirfendereski, Jae Sung Park, Ruiguo Yang

Department of Mechanical and Materials Engineering: Faculty Publications

Porous substrate electroporation (PSEP) is a promising new method for delivering molecules such as proteins and nucleic acids into cells for biomedical research. Although many applications have been demonstrated, fundamentals of the PSEP delivery process are not yet well understood, partly because most PSEP studies rely solely on fluorescent imaging for evaluating delivery and quantifying successful outcomes. Although effective, only utilizing imaging alone limits our understanding of the intermediate processes leading to intracellular delivery. Since PSEP is an electrical process, electrical impedance measurements are a natural addition to fluorescent imaging for PSEP characterization. In this study, we developed an integrated …

Investing Traditional Architecture That Fulfills The Supreme Human Needs With Its Spiritual Dimension In Reconstruction / The Architecture Of Old Mosul City, A Case Study, Sinan Mohammad Talee Al-Saffar, Anwar Subhi Ramdan Al - Qaraghuli

Al-Esraa University College Journal for Engineering Sciences

Architecture has sought since time immemorial to meet multiple human needs, starting from the basic physiological needs for human survival, psychological needs (social and individual) to needs related to human progress, such as taking into account the aesthetic and spiritual aspects, which represent the highest levels of those needs, through a set of design aspects and characteristics. This research is based on the study of the spiritual dimension of higher human needs in general that architecture seeks to meet, by studying that in the architecture of traditional cities, in particular, to enhance architectural knowledge with regard to the importance of …

The Role Of Algorithms In Formulating The Architectural Formation, Ghada Ghalib Abdul Wahab, Younis Mahmood M. Salem

Al-Esraa University College Journal for Engineering Sciences

Algorithms are mathematical processes that provide step-by-step instructions for solving a specific problem. They are commonly used in computer science and other technical fields to automate processes and solve complex problems. One great application of algorithms is the generation of shapes. Algorithms can be used to create complex shapes and patterns that are difficult or impossible to create manually. We will explore how algorithms can be used as a mechanism to generate shapes by adopting the Voronoi algorithm because it provides a wide environment for creativity through new intellectual processes that may not occur at all in the human mind …

The Detection Of Android Malwares Using The Features Selection Technique, Farah Rafid Salman, Amer Abdulmajeed Abdulrahman

Al-Esraa University College Journal for Engineering Sciences

The use of Android smartphones has been rising quickly as Internet-based services gain more popularity and develop. The Android operating system's enormous popularity has drawn malware attacks on these devices. It is difficult and ineffective to detect malware versions with features that modify their behavior in order to avoid detection by machine learning (ML) techniques. Effective feature selection plays a crucial role in detecting malware characteristics and reduces the dimensionality of a large dataset by removing unnecessary features that are not useful and keeping those relevant features that increase classification accuracy and detection rate. This helps to solve the problems …

A Review Of Polymer – Particles Composite Materials, Ismail Ibrahim Marhoon, Ayad Abbood Abdul Al-Hassan, Mohammed Ali Abdulrehman

Al-Esraa University College Journal for Engineering Sciences

In several engineering applications traditional materials are replacedby composite materials. Filled composite materials consist of the continuousmatrix and the filling particles. The primary purpose of introducing inorganicsolid particles into polymers is to essentially increase mechanical and physicalproperties. The wear properties of polymer composite can be changed to agreater degree by modifying the process of preparing the filled compositematerials. In the present review, a large-scale research has been conductedon the effect of wear on the composites of polymers. The effect of filler onthe polymer composites wear behavior has been thoroughly explained

Ability Of Replacing The Steel Strands By Cfrp In Pre-Stressed Concrete Girders: Art Review, Ahmed Salim Edan, Wael Shawky Abdulsahib

Al-Esraa University College Journal for Engineering Sciences

Fiber-reinforced polymer (FRP) composites are the modern,trustworthy alternatives to steel tendons and rebars. The bulk of currentresearch is devoted to establishing the feasibility of incorporating carbonfibre-reinforced polymer (CFRP) into reinforced concrete girders byevaluating the strength and reliability of CFRP and concrete components.In order to improve fatigue and corrosion resistance, CFRPs are crucial.Comparing reinforced prestressed concrete bridge girders strengthenedwith conventional steel reinforcement to those reinforced with CFRPs offersthe possibility of greatly increasing service life. Also widely researchedand used in bridge engineering as a corrosion-resistant substitute for steelreinforcement is CFRP composite material. The use of carbon fiber-reinforcedplastic (CFRP) reinforcement for prestressing concrete …

A Review Article On The Performance Based Seismic Design Of Structures, Reem Hatem Ahmed, Sahar Elaiwi, Shelan Hameed Ameen

Al-Esraa University College Journal for Engineering Sciences

For the most part, seismic design builds complex structural systems using the same small number of essential structural components as non-seismic design projects. Based on the building regulations, structures are frequently designed to "withstand" the largest earthquake with a given likelihood that is projected to happen at their location. This means that by avoiding structures from collapsing, the number of fatalities must be maintained to a minimal. Seismic design involves knowing the many failure modes regarding a structure and giving it the right stiffness, strength, ductility, and layout for ensuring that these modes do not take place. In this essay, …

Investigation And Analysis Of Circular Economy Indicators In The Manufacturing Industry, Dina Aljamal

Thesis/ Dissertation Defenses

In the pursuit of sustainable development, the concept of the circular economy (CE) has emerged as a compelling and transformative alternative to the traditional linear economic model (i.e., take, make, use, dispose). The limitations of the linear economy in addressing contemporary global challenges have highlighted the urgency of adopting a more regenerative approach. Simply put, the circular economy aims to maximize the value extracted from available resources over their lifecycle, thereby ensuring the fulfillment of both current and future generations' needs. This thesis sheds light on a pivotal solution for effectively integrating circular economy principles into enterprises, thereby reinforcing sustainability. …

Analysis Of Thin Plates In Bending By New Rectangular Strain Based Element., Samira Chichoune, Cherif Rebiai

Emirates Journal for Engineering Research

Abstract

This paper deals with the development of a new simple four node rectangular finite element for bending analysis of thin plates. The displacement s field of this element is based on the assumed functions for the various strains satisfying the compatibility equations. This developed element has three degrees of freedom at each node (two rotations and one translation), and it passed successfully benchmark tests in the case of thin plates without shear locking phenomena. The obtained numerical results using the developed element converge toward both analytical and reference solutions.

Thermal Transport And Rheological Properties Of Hybrid Nanofluids Based On Vegetable Lubricants, Helio Ribeiro, Jaime Taha-Tijerina, Ofelia Gomez, Ever Acosta, Gabriel M. Pinto, Lorena R. C. Moraes, Guilhermino J. M. Fechine, Ricardo J. E. Andrade, Jefferson Reinoza, Victoria Padilla, Karen Lozano

Mechanical Engineering Faculty Publications

Nanofluids based on vegetal oil with different wt.% of carbon nanotubes (CNT), hexagonal boron nitride (h-BN), and its hybrid (h-BN@CNT) were produced to investigate the effects of these nano-additives on the thermal conductivity and rheological properties of nanofluids. Stable suspensions of these oil/nanostructures were produced without the use of stabilizing agents. The dispersed nanostructures were investigated by SEM, EDS, XRD, and XPS, while the thermal conductivity and rheological characteristics were studied by a transient hot-wire method and steady-state flow tests, respectively. Increases in thermal conductivity of up to 39% were observed for fluids produced with 0.5 wt.% of the hybrid …

Increased Ductility Of Ti-6al-4v By Interlayer Milling During Directed Energy Deposition, Rakeshkumar Karunakaran, Luz D. Sotelo, Hitarth Maharaja, Calsey Nez, Monsuru Ramoni, Scott Halliday, Sushil Mishra, Joseph A. Turner, Michael P. Sealy

Department of Mechanical and Materials Engineering: Faculty Publications

Additive manufacturing (AM) often results in high strength but poor ductility in titanium alloys. Hybrid AM is a solution capable of improving both ductility and strength. In this study, hybrid AM of Ti-6Al-4V was achieved by coupling directed energy deposition with interlayer machining. The microstructure, residual stress, and microhardness were examined to explain how interlayer machining caused a 63% improvement in ductility while retaining an equivalent strength to as-printed samples. Interlayer machining introduced recurrent interruptions in printing that allowed for slow cooling-induced coarsening of acicular α laths at the machined interfaces. The coarse α laths on the selectively machined layers …

Development Of Guidance, Navigation, And Control Systems For Multi-Spacecraft Assembly In Proximity Operations, Mohammed Ayman Atallah

Thesis/ Dissertation Defenses

This thesis presents the development of Guidance, Navigation, and Control (GNC) algorithms for multispacecraft assembly in proximity operations. A 3-DOF mathematical model of spacecraft relative translational motion is derived using the Euler-Lagrange method. Additionally, a 6-DOF mathematical model of spacecraft relative translational and rotational motion is derived using the twistor method, with consideration for the kinematic coupling effect. A new Linear Time-Invariant (LTI) model is developed based on the twistor-based model, which is utilized in the design of the GNC systems. LTI Model Predictive Control (MPC) and Linear Time-Varying (LTV) MPC algorithms are employed to develop a Guidance and Control …

Reducing Uncertainty In Sea-Level Rise Prediction: A Spatial-Variability-Aware Approach, Subhankar Ghosh, Shuai An, Arun Sharma, Jayant Gupta, Shashi Shekhar, Aneesh Subramanian

I-GUIDE Forum

Given multi-model ensemble climate projections, the goal is to accurately and reliably predict future sea-level rise while lowering the uncertainty. This problem is important because sea-level rise affects millions of people in coastal communities and beyond due to climate change's impacts on polar ice sheets and the ocean. This problem is challenging due to spatial variability and unknowns such as possible tipping points (e.g., collapse of Greenland or West Antarctic ice-shelf), climate feedback loops (e.g., clouds, permafrost thawing), future policy decisions, and human actions. Most existing climate modeling approaches use the same set of weights globally, during either regression or …

Acoustophoresis Around An Elastic Scatterer In A Standing Wave Field, Khemraj Gautam Kshetri, Nitesh Nama

Department of Mechanical and Materials Engineering: Faculty Publications

Acoustofluidic systems often employ prefabricated acoustic scatterers that perturb the imposed acoustic field to realize the acoustophoresis of immersed microparticles. We present a numerical study to investigate the timeaveraged streaming and radiation force fields around a scatterer. Based on the streaming and radiation force field, we obtain the trajectories of the immersed microparticles with varying sizes and identify a critical transition size at which the motion of immersed microparticles in the vicinity of a prefabricated scatterer shifts from being streaming dominated to radiation dominated. We consider a range of acoustic frequencies to reveal that the critical transition size decreases with …