Abdullah A. Alshaya
@ku.edu.kw
Associate Professor at Mechanical Engineering Department
Kuwait University
An associate professor of Mechanical Engineering Department at Kuwait University, a mechanical engineer by practice, and a trained mathematician. I am holding a PhD in Mechanical Engineering from University of Wisconsin-Madison along with dual Masters of Science in Mechanical Engineering and Engineering Mechanics and a Master of Arts in Mathematics. Currently, I have published more than 25 papers in international recognized peer-reviewed journals and conference proceedings, and I have taught more than 9 undergraduate and graduate courses at Kuwait University. My research interest includes: biomechanics, experimental mechanics, and vibration control.
EDUCATION
Ph.D. in Mechanical Engineering from University of Wisconsin - Madison, 2013 - 2016.
M.S. in Mathematics from University of Wisconsin - Madison, 2013 - 2015.
M.S. in Engineering Mechanics from University of Wisconsin - Madison, 2012 - 2013.
M.S. in Mechanical Engineering from University of Wisconsin - Madison, 2011 - 2012.
B.S. in Mechanical Engineering from Kuwait University, 2004 - 2008.
RESEARCH, TEACHING, or OTHER INTERESTS
Mechanical Engineering, Mechanics of Materials, Control and Systems Engineering, Biomedical Engineering
Scopus Publications
Scholar Citations
Scholar h-index
Scholar i10-index
Scopus Publications
Abdulaziz Alazmi, Abdullah Alshaya, and Khaled Alhazza
Elsevier BV
Abdullah A. Alshaya
Elsevier BV
Abdullah Alshaya and Adel Alshayji
SAGE Publications
A robust input command based on multiple steps for eliminating the residual vibrations of a multimode linear system is proposed. Only the system resonant frequencies are needed to determine the step magnitudes in the shaped command. The command duration is selectable to help in designing an optimum command that compensates between the reduction in the transient vibration, the enhancement in the command robustness, and the increase in the total maneuver time. The induced transient and residual sloshing oscillations of a suspended water-filled container are suppressed using the proposed command. The dynamics of the sloshing is numerically simulated using finite element method that accommodates the interactions between the fluid, structural, and multi-body dynamics. A short move time penalty is incurred with the price of significant reduction in the liquid sloshing. The performance of the shaped command to the system parameters and the robustness to their uncertainty are investigated. An improved robust input command in the presence of uncertainties in the cable length and water depth is also introduced. The effectiveness and excellence of the proposed command is demonstrated through a comparison with multimode zero-vibration input shaper and time-optimal flexible-body control.
Abdullah Alshaya and Khaled Alhazza
Elsevier BV
Abdullah Alshaya
IEEE
Command shaping controls based on discrete-time functions are proposed for eliminating the residual vibrations of flexible dynamics systems. The input profile can utilize the input driven actuator's full capability without comprising the vibration reduction at the end of the command duration. The profile of the multi-steps shaped input command be discretized into small time segments that match the sampling time of the actuator's hardware. Furthermore, its smoothness based on reducing the induced jerks in the input profile as well as its robustness to the system parameters uncertainties can be easily adjusted and enhanced. The shaped command can be designed from the knowledge of the system's natural frequencies and damping ratios. Numerical experiments were used to test the efficacy of the proposed profiles.
Carlos Aurelio Andreucci, Abdullah Alshaya, Elza M. M. Fonseca, and Renato N. Jorge
MDPI AG
A new biomechanism, Bioactive Kinetic Screw (BKS) for screws and bone implants created by the first author, is presented using a bone dental implant screw, in which the bone particles, blood, cells, and protein molecules removed during bone drilling are used as a homogeneous autogenous transplant in the same implant site, aiming to obtain primary and secondary bone stability, simplifying the surgical procedure, and improving the healing process. The new BKS is based on complex geometry. In this work, we describe the growth factor (GF) delivery properties and the in situ optimization of the use of the GF in the fixation of bone screws through a dental implant. To describe the drilling process, an explicit dynamic numerical model was created, where the results show a significant impact of the drilling process on the bone material. The simulation demonstrates that the space occupied by the screw causes stress and deformation in the bone during the perforation and removal of the particulate bone, resulting in the accumulation of material removed within the implant screw, filling the limit hole of the drill grooves present on the new BKS.
Abdullah A. Alshaya and John M. Considine
Springer Science and Business Media LLC
Abdullah Alshaya and Dima Almujarrab
SAGE Publications
A smooth polynomial shaped command with an adjustable command time length is proposed for eliminating the residual vibrations of a multi-mode system. The ability of eliminating jerks and vibrational modes, regardless of their number, offers the most advantage of the proposed command. A numerical simulation is conducted to test the command’s effectiveness by eliminating the residual sloshing oscillations of a liquid-filled container conveyed by an overhead crane in a rest-to-rest manoeuvre. The governing equations of the liquid free-surface level are derived by modelling the sloshing dynamics by a series of mass–spring–damper harmonics. The proposed model accounts for the coupling between the pendulum dynamics and the sloshing equivalent mechanical model. The command’s robustness to the system parameters’ uncertainties, liquid depth and cable length, are investigated as well. The ability of adjusting the command length and retaining higher sloshing modes in command-designing are also outlined.
Abdullah Alshaya and Khalid Alghanim
ASME International
AbstractThe residuals of liquid free-surface wave oscillations induced by a rest-to-rest crane maneuver of a suspended liquid container are eliminated using a command-shaped profile. The dynamics of liquid sloshing are modeled using an equivalent mechanical model based on a series of mass-spring-damper systems. The proposed model considers the excited frequencies of the container swing motion and liquid sloshing modes. The objective is to design a discrete-time shaped acceleration profile with a variable command length that controls the moving crane-jib, while suppressing the sloshing modes. Simulations are conducted to illustrate the command effectiveness in eliminating liquid sloshing with a wide variation range of system and command-designing parameters; liquid depth, cable length, command duration, and the employing of higher sloshing modes in representing the sloshing dynamics. The command sensitivity of the input command to changes of the system parameters are treated as well. A refined and smooth input command based on suppressing the residuals of multimodes is also introduced. Furthermore, the command effectiveness was supported by a comparison with the time-optimal flexible-body control and multimode zero vibration input shaper.
Abdullah Alshaya and Shiang-Jiun Lin
SAGE Publications
The ability to stress-analyze complicated structures from recorded load-induced temperatures is demonstrated. The considered structures have a near-surface hole and subjected to a concentrated load. The complexity of the structure is simplified by conformal mapping, the traction-free condition on the boundary of the hole is analytically satisfied by analytic continuation, and the equilibrium and compatibility conditions are satisfied by means of Airy stress function in complex-variable formulation. For isotropic member that is cyclically loaded within its elastic range, the produced in-phase temperature variations are linearly proportional to the local changes in the normal stresses. Even though no recorded thermal data were used at or near to the edges, the present hybrid method simultaneously separates the load-induced temperatures into the individual stress components, determines reliably the boundary stress and hence the stress concentration, and smooths the measured input data. Unlike prior capabilities of using geometrical symmetry to simply the stress function representation, the present analysis retains all the terms in the stress functions. Therefore, the considered hybrid stress analysis approach of such complex structures extends significantly the applicability of thermoelastic stress analysis compared to prior capabilities and is considered to be the most complicated formulation of the hybrid complex-variable method to date. To support the reliability of the present hybrid method, the results were compared with finite element predictions and previous results based on Mitchell solution.
B. Kalaycioglu, A. Alshaya, and R. Rowlands
Wiley
AbstractStresses can significantly influence the mechanical integrity of engineering structures. Motivated by prevalence of members containing cutouts, the objective of this paper is to demonstrate ability to stress analyse a finite, complicated‐shaped plate containing an asymmetrical, irregularly shaped hole. Combining the load‐induced temperature information with analytical and numerical tools provides the independent stresses full field, including on edges of the plate and adjacent to the top load. In addition to utilising real, rather than complex, variables, the technique smooths the recorded information, evaluates individual stresses, and requires neither differentiating the measured data nor knowing the elastic properties. Results are supported by those from a finite element analysis, force equilibrium, and strain gages.
Abdullah A. Alshaya and John M. Considine
Springer International Publishing
A. Alshaya, John M. Considine, and R. Rowlands
Springer International Publishing
B. Kalayciogli, A. Alshaya, and R. Rowlands
Springer International Publishing
Abdullah Alshaya and Robert Rowlands
Elsevier BV
A. Alshaya, W. A. Samad, and R. E. Rowlands
Springer International Publishing
A. Alshaya, X. Shuai, and R. Rowlands
Springer International Publishing
A. Alshaya, J. Hunt, and R. Rowlands
American Society of Civil Engineers (ASCE)
AbstractStress and strain concentrations and in-plane and out-of-plane stress constraint factors associated with a circular hole in thick, loaded orthotropic composite plates are determined by three-dimensional finite element method. The plate has essentially infinite in-plane geometry but finite thickness. Results for Sitka spruce wood are emphasized, although some for carbon-epoxy composites are included. While some results are similar to those for isotropy, there are significant consequences due to material orthotropy. Maximum stress and strain concentration factors occur at midplane for thin plates but closer to the external traction-free surfaces for thick plates. These factors decrease as the plate surface is approached and reach lower values unrepresentative of the maximum values. Differences between the midplane and/or maximum and surface stress or strain concentration factors in Sitka spruce, range from 8% if the wood grain is parallel to the vertically applied load to 15% when the grain is perpe...
A. Alshaya, X. Shual, and R. Rowlands
Springer Science and Business Media LLC
RECENT SCHOLAR PUBLICATIONS
MOST CITED SCHOLAR PUBLICATIONS
GRANT DETAILS
2. ``Analysis of Bone Healing in a New Biomechanical Screw'', Kuwait University, April 22, 2023 to April 21, 2025, Primary Investigator (PI), 31,150 K.D ($101,000).
1. ``Control of Three-dimensional Nonlinear Sloshing using Multi-Steps Input Commands'', Kuwait University, May 07, 2022 to May 06, 2024, Primary Investigator (PI), 10,000 K.D ($32,600).
INDUSTRY EXPERIENCE
Co-Founder, Kuwait Institute for Training and Engineering Simulations (KITES), Kuwait, 2020-present.
Chief Scientific Officer (CSO) and Lead Simulation Consultant.
Well Surveillance Engineer, Kuwait Oil Company (KOC), Kuwait, 2009-2011.
Witnessing, developing, and optimizing oil well productions.
Green Belt Certification in Six Sigma Methodologies, Six Sigma Academy, 2011.
Six Sigma Project: Reduce the failed jobs which are requested by Field Development Engineers to 70% in a six-month period by guiding the Well Surveillance Engineers to perform the requested jobs more professionally and effectively while keeping the cost and operation time as low as possible.
Power Plant Engineer, Ministry of Electricity and Water, Kuwait, 2009.
Developing and designing power plants.