Engineering Vibrations Lab

In our engineering vibrations lab, we conduct experimental analysis of composite building models, both with and without fluid viscous dampers (FVD), to study their dynamic responses under various loading conditions. We utilize viscoelastic models such as the Generalized Maxwell, Kelvin-Voigt, and Rayleigh models to accurately characterize material behavior, ensuring our advanced finite element analysis (FEA) simulates real-life structures effectively; this is complemented by 3D printing techniques to fabricate parts that are integrated into our composite models for comprehensive vibration testing.

Projects People Equipment Papers News/ Media Appearance

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Projects

Symposium-1

Symposium-2

 

 

 

 

 

 

Symposium of Student Scholars, Nov 2024

First runner-up in both grad and undergrad categories for the two poster.

  • Finite Element Analysis (FEA)

     This research utilizes finite element analysis (FEA) to examine the dynamic response of a composite building structure under seismic loading, specifically focusing on the role of fluid viscous dampers (FVDs). Various structural configurations are modeled to assess how FVDs reduce stress and displacement during dynamic events. Through frequency and response spectrum analyzes, the performance of buildings with rigid versus deformable floor assumptions is compared under base excitation. The addition of FVDs significantly diminishes vibrations, enhancing resilience and reducing structural fatigue. The study conducts FEA using SolidWorks© to find a model that accurately reflects the non-linear responses of real buildings. The findings aim to develop a new viscoelastic model that improves predictions of structural performance during seismic events, ultimately contributing to better design and construction practices in seismically active areas.

  • Viscoelastic Modeling

    The study includes an extensive review of viscoelastic models for fluid viscous dampers (FVDs), such as the Generalized Maxwell, Kelvin-Voigt, and Rayleigh models, evaluating their effectiveness in simulating structural behavior. Using SolidWorks©, finite element analysis (FEA) is conducted to test these models, aiming to identify one that accurately represents the non-linear response of real buildings. The research seeks to develop a new viscoelastic model for improved accuracy in predicting structural performance under seismic loads, enhancing understanding of dynamic interactions and the role of dampers in vibration mitigation.

  • Experimental Analysis

     This experimental analysis examines the vibration characteristics of a 1:10 scale, 3-story building model—both with and without fluid viscous dampers—to improve structural integrity and stability. Constructed from steel frames and 3D-printed polymeric floors, the model measures 30 cm x 40 cm x 90 cm. A custom shake table, designed for reciprocating motion, will test the model using two different dynamic motion designs: slide-in wedge structures with ball bearings and a cylinder-piston mechanism. Brackets provide support for the model without dampers. Vibration data will be collected using a waveform generator, accelerometer, and vibrometer. The shake table will be optimized for various building sizes while minimizing footprint. The research aims to develop an effective damper arrangement and a new viscoelastic model, enhancing building resilience against vibrations and offering insights into advanced damping technologies for seismic safety.

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People

NasseriSimin Nasseri (Ph.D., P.E.), Currently a full professor at Kennesaw State University

Dr. Simin Nasseri currently works at the department of mechanical Engineering, Kennesaw State University (USA) as a full professor. She is recognized as the University's Distinguished Professor. Simin does research in Mechanical Engineering. At the moment, her recent projects are related to Engineering vibrations and biomechanical engineering. Formerly, she conducted research projects related to Manufacturing Engineering, Rheology and viscoelasticity, Polymer processing, Biomechanical engineering (artificial organs and soft tissue rheology), Computational Mechanics and CFD (Parallel Computing via PVM, Finite Element Method, Boundary Element Method, Completed Double Layer Boundary Element Method), Robotics, and Micromachinery. See more here.

Dr_JonaidiDr. M. Jonaidi obtained his Ph.D. from the University of Sydney and is currently working at Civil and Environmental Engineering Department, KSU.

Over 38 years of research and industry experience, he has been involved in the analysis and design of complex structural projects, including FEA of high-rise buildings and steel structures, floor vibration analysis for concrete slabs and pedestrian bridges, serviceability vibration analysis of high-rise buildings, earthquake engineering, post-tensioned concrete structures, nonlinear and buckling analysis of thin-walled cylinders, analysis of long-span spatial steel structures, analysis of glazing facades, below-grade shoring walls, retrofit of concrete structures using Fiber Reinforced Polymers (FRP), and the strengthening of structures to resist progressive collapse. See more here.

 

 

Salim

Salim Kortobi (Lead student) Salim Kortobi graduated Summa Cum Laude from Kennesaw State University with a B.S. in Mechanical Engineering with minors in Engineering Design Graphics and Manufacturing Engineering Technology, and is currently pursuing his M.S. in Mechanical Engineering at KSU. He has extensive experience in SolidWorks and is a Certified SolidWorks Expert (CSWE) in Mechanical Design. As a SolidWorks training consultant, he empowers professionals to optimize their workflows and achieve outstanding project outcomes by effectively leveraging the software's tools and techniques. Salim also has extensive expertise in Additive Manufacturing (3D printing), which he utilized to help establish the BioMechanical Engineering Lab (BME Lab) at KSU, where he also trains students and team members in advanced techniques and equipment usage. As a research assistant for Dr. Nasseri and Dr. Jonaidi, Salim has contributed to various projects, including the development of finger, foot, and spine supports, along with the fluid viscous dampers (FVD) project. He also has extensive experience in Finite Element Analysis (FEA) and SolidWorks Simulation, which he has utilized to run detailed simulations that support ongoing research efforts, and to provide training for team members in these advanced techniques.

BrentBrent Pruitt is a Marine Corps veteran who is currently working at KSB GIW as a design engineer designing centrifugal slurry pumps. He graduated in 2022 from Indiana State University with a B.S. Degree in Mechanical Engineering Technology. He is a certified Project Management Professional (PMP) and an Engineer-In-Training (E.I.T.) with 7 years of design experience. In 2023 he began pursuing a M.S. in Mechanical Engineering at Kennesaw State University where he met Dr. Nasseri and took her "Advanced Manufacturing" graduate level class. He joined her research team as Graduate Research Assistant (GRA) in Spring 2024 and continued the research project through a Master's Project course.

 

KevinDKevin Doan obtained his Bachelor’s Degree in Mechanical Engineering Technology with a concentration in Engineering Design Graphics from KSU in 2018. Since then, he has been working in the manufacturing industry including mechanical and electrical designs for various structures and equipment systems. He aspires to gain a better understanding in connecting theory to practice and currently pursues a Master’s Degree in Mechanical Engineering. Kevin was in Dr. Nasseri's "Advanced Manufacturing" graduate level class and started to conduct research with her in 2024.

 

 

 

Zachary Vetter is completing his B.S. in Mechanical Engineering with a minor in Nuclear Engineering at Kennesaw State University. He has passed the FE Mechanical exam and will achieve EIT status upon graduation in December 2024. Currently, he works as a Laboratory Technician at Kimberly-Clark, focusing on product testing and troubleshooting. Zachary also contributes as a research assistant under Dr. Nasseri on the Fluid Viscous Damper Project, aimed at enhancing structural resilience.

SebastianSebastian Garay is a Senior Mechanical Engineering student at Kennesaw State University with over two years of industry experience. He has a strong passion for robotics and 3D modeling, which has guided his academic and professional journey. Sebastian was introduced to Professor Nasseri during his Machine Dynamics & Vibrations course. Early in 2024, he contacted her to explore potential research opportunities, leading to his involvement in the current project. His roles at the Georgia Tech Research Institute (GTRI) and Cummins have deepened his commitment to research and development, allowing him to thrive in collaborative environments that foster innovation. Sebastian is particularly drawn to R&D for the opportunity to work alongside industry leaders and make meaningful contributions to cutting-edge projects. Following graduation, he plans to pursue a Master’s in Robotics to further enhance his expertise and impact in the field.

 

Kevin Chong is a senior undergraduate student at Kennesaw State University. He's expected to graduate in Fall 2024 with a B.S. in Mechanical Engineering. He was previously employed at Chart Industries as a Research and Development intern, creating new test apparatuses and prototyping pressure vessels. This is his first time working as a research assistant under the direction of Dr. Nasseri and Dr. Jonaidi.

DavidADavid Amaya is a KSU undergraduate student pursuing a B.S. in Mechanical Engineering with a minor in Aerospace Engineering. Committed to advancing his expertise, he plans to continue his academic journey by pursuing a M.S. in 
Aerospace Engineering after graduation. David serves as the president of the Fluid Power Club, where he leads initiatives related to pneumatic and hydraulic systems. He also works as a research assistant under Dr. Nasseri on the Fluid Viscous Damper Project, focusing on structural dynamics using FVD's to improve a building's resilience to earthquakes.

 

 

UrbanUrban Michaels is a rising junior studying mechanical engineering at Kennesaw State University. Having recently conducted NSF-funded research on thermoelectric cooling for aircraft avionics, earning "Best Poster Presentation" at Washington University in St. Louis, he now plans to pursue a Ph.D. in mechanical engineering. Urban aims to advance aerospace technologies through sustainable thermal management and innovative solutions.

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Publications and Presentations

"Finite Element Analysis of Seismic Response in Structural Models with and without Fluid Viscous Dampers, Using a New Viscoelastic Model, Phase I", 2024 Fall Symposium of Student Scholars, Poster, Salim Kortobi, Brent Pruitt, and Urban Micheals, Research Mentors: Simin Nasseri & Mohammad Jonaidi. First Runner-up in grad categories.

"Experimental Analysis of Vibration Mitigation in a Composite Building Prototype Using Fluid Viscous Dampers, Phase I", 2024 Fall Symposium of Student Scholars, Poster, Sebastian Garay, Salim Kortobi, David Amaya, and Kevin Chong. Research Mentors: Simin Nasseri & Mohammad Jonaidi. First Runner-up in undergrad categories.

Other Related Publications/Presentations:

Nasseri, S., Jonaidi, M., Taasoobshirazi, G., Artificial Intelligence Symposium, "Shaping the Future of Engineering Education with AI," KSU, Marietta Campus. (April 24, 2024).

Vipperman, K., Kortobi, S., Jonaidi, M., Nasseri, S., Symposium of Student Scholars-April 2024, "Outlining Structural Behavior for Internal Patterns Within Additive Manufacturing," KSU, Kennesaw, Georgia. (April 18, 2024).

Vipperman, K., Kortobi, S., Jonaidi, M., Nasseri, S., 2024 ASEE Southeastern Section Conference, "Education of Structural Behavior for Internal Patterns Within Additive Manufacturing," ASEE, Marietta, Georgia. (March 12, 2024).

Kortobi, S., Pruitt, C., Jonaidi, M., Nasseri, S., 2024 ASEE Southeastern Section Conference, "Advancing Engineering Education:  Leveraging Finite Element Method for Enhanced Learning," ASEE, Marietta, Georgia. (March 11, 2024).

Jonaidi, M., Sasani, M., Nasseri, S., Williams, G. (2023). Investigating Release‐Connection between Post‐tensioned Concrete Slab and Wall. Book Chapter, Springer; Proceedings of the Canadian Society of Civil Engineering Annual Conference 2022. Whistler, B.C.: Springer Nature Switzerland AG. https://www.springerprofessional.de/en/investigating-release-connection-between-post-tensioned-concrete/26689028

Jonaidi, M., Nasseri, S. (2022). Innovative Industry-Related Research Projects for Civil Engineering Undergraduate Students. 2022 ASEE Annual Conference and Exposition Proceedings. ASEE Annual Conference 2022. http://dx.doi.org/10.18260/1-2--41214

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Equipment

  •  Triaxial Vibrometer CESVA VC431 (ISO 804)
  • Accelerometer (CESVA AC031)
  • Arbitrary wave-form generator (Uni-T UTG4122A 120MHz 2Ch)
  • Dell Precision 5570  i9 processor for Parallel Virtual Machine Projects (PVM) ( total of 3)
  • 3D Printer (Raise 3D Pro3)
  • Einstar 3D Scanner
  • BEAMNOVA 6" Metal Sheet Cutter 
  • Pipe/Tube Cutter
  • Digital Protractor, Digital Level, Digital Hand Dynamometer, Digital Newton Meter, Digital Goniometer, Flexible Ruler, Strain Gauges, Angle Vise with Swivel Base, HATCHBOX TPU, Carbon Fiber Sheet 1mm, 3M Micropore Paper Tape, Digital Caliper 8", Digital Dial Gage, Weight Set, and so on.

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Media Appearance:

Linkedin post

Brent Pruitt's post

Sebastian Garay's post

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