Karagülle, Hira

Profile Picture
Profile URL
https://hdl.handle.net/20.500.14365/6898
Name Variants
Karagulle, H.
Karagulle, Hira
Karaguelle, H.
Karagülle, H
Job Title
Email Address
hira.karagulle@ieu.edu.tr
Main Affiliation
05.11. Mechatronics Engineering
Status
Current Staff
Website
ORCID ID
0000-0001-5546-7538
Scopus Author ID
6602956521
Turkish CoHE Profile ID
B178E2464228F409
Google Scholar ID
28O9BosAAAAJ
WoS Researcher ID
O-9039-2018
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Hira_Karagulle.jpg (12.2 KB)

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32

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  • Thumbnail Image
    Article
    Vibration Control of a Beam Under a Moving Mass Through Adjusting Trapezoidal Velocity Profile
    (2023) Akdağ, Murat; Karagülle, Hira
    In this article, the residual vibration of a simply supported beam with a moving mass is studied. The mass moves from a starting point to an end point on the beam with a trapezoidal velocity profile having accelerating, constant velocity and decelerating time intervals. The residual vibration of the mid-point of the beam after the mass stops is analyzed. The mathematical model of the system is developed using the finite element (FE) theory. Newmark method is used for the solution of FE model having time dependent matrices because of the moving mass. The model is verified by comparing the solution results with the results given in the previous studies in the literature. It is seen that the relationship between the natural frequency of the system and the velocity profile of the moving mass has an effect on the residual vibration of the structure. If the natural frequency of the system and the inverse of the deceleration time interval of the moving mass are equal while the moving mass is at the stopping position, residual vibrations occur at a minimum level. It seen that with the right speed profile selection, the decrease in vibration levels approaches 70% during the movement and 80% after stopping.
  • Thumbnail Image
    Article
    Citation - Scopus: 1
    Modal, Static, Harmonic, Transient-Dynamic and Random Vibration Analyses of a Two Degree of Freedom System by Matlab and Ansys
    (SAGE Publications Inc., 2025) Karagülle, H.; Bülbül, İ.; Akdağ, M.
    Static, harmonic, transient-dynamic and random vibration analyses are widely used to design structures. Commercial finite element (FE) programs such as ANSYS are used to analyze structures with complex geometries. However, FE programs can produce erroneous results if the user makes even minor mistakes. Thus, it is important to understand the basic theory of FE solutions. The purpose of this work is to give the introductory theory of FE solutions by considering a two degree of mass-spring system. The MatLAB programs based on the analytical solutions are given. The MatLAB results are compared with the FE results by ANSYS. The system is modeled in SolidWorks and imported to ANSYS. Modal, static, harmonic frequency response, impulse response, and random vibration responses are considered. Modal and static analyses for unconstrained systems are also considered. The results obtained by MatLAB and ANSYS are in good agreement. The results of this study can be used by the users of other simulation programs for comparison. © The Author(s) 2025.
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    Article
    Citation - WoS: 10
    Citation - Scopus: 14
    Hybrid Vibration Control of an Industrial Cfrp Composite Robot-Manipulator System Based on Reduced Order Model
    (Elsevier, 2022) Ilman, Mehmet Mert; Yavuz, Sahin; Karagulle, Hira; Uysal, Ali
    This paper introduces a novel hybrid vibration control of an industrial flexible link manipulator (FLM) with carbon-fiber reinforced polymer (CFRP) composite material. The hybrid controller consists of a closed-loop direct strain feedback controller (DSFC) and a new open-loop input shaper (OLIS), and its performance is examined and compared by numerical simulation and experiment. Vibration attenuation is also verified by a spare sensor, an accelerometer. Thanks to the design of an analog isolator circuit, data acquisition of the real-time experiments are carried out noise-free from the servo driver. Reduced-order-model (ROM) is generated for the composite link with three different loading conditions and model for servo system is derived via system identification. Impulse force test hammer (IFTH) equipment is used to excite the system with force input and the results of the experiments/simulations confirm that the controller is robust against the impulse disturbances. As a result, a decrease of 88 +/- 6.9 percent in vibration amplitudes and a decrease of 90 +/- 7 percent in vibration duration confirms that the proposed controller is effective for vibration control of the flexible arm even under disturbance. Controller performance also enabled the FLM to work with payloads 16 times of its own weight.
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    Article
    Citation - WoS: 2
    Citation - Scopus: 2
    Active Vibration Control of Cantilever Structures by Integrating the Closed Loop Control Action Into Transient Solution of Finite Element Model and an Application To Aircraft Wing
    (Mdpi, 2025) Bulbul, Ilker; Akdag, Murat; Karagulle, Hira
    In this study, the active vibration control (AVC) of a cantilever beam with an end mass is considered first and studied experimentally and through simulation. The Laplace transform method, Newmark method, and ANSYS are used for simulations. An impulse force applied to the mass and the velocity actuation applied to the base are assumed to be disturbance and controlling input, respectively. The displacement of the mass is taken as the feedback signal in simulations. Four strain gauges are located near the bottom point, connected with a Wheatstone bridge, and the output voltage of a load-cell amplifier (LCA) is used as the feedback signal in experiments. Strain feedback is considered in experiments because it is easy to implement, cost-effective, and can be used in applications. Experimental displacement signals obtained from the top of the beam are compared with the output signals from LCA and it is observed that they are approximately linearly dependent. Velocity input is generated with a servo motor-driven linear actuator in experiments. The closed loop control is achieved by a personal computer with an Adlink-9222 PCI DAQ card and a C program in the experiments. The integration of the closed loop control action into the transient solution with Newmark method and ANSYS is implemented in simulations. The input reference value is taken as zero for vibration control. The instantaneous value of the feedback signal at a time step is subtracted from zero to find the error signal value and the error value is multiplied by the control gain to calculate the controlling signal. The simulation results obtained with the Newmark method and ANSYS are in good agreement with the analytical results obtained with Laplace transform method. Simulation results are also in acceptable agreement with the experimental results for explaining the behavior of the success of AVC depending on the control gain, Kp. After verifying ANSYS solutions, the ANSYS procedure is applied to an aircraft wing as a real complex cantilever structure. The wing, with a length of 810.8 mm, 13 ribs with a length of 300 mm, and NACA 4412 airfoil, is considered in this study. It is observed that the AVC of real engineering structures can be simulated by integrating control action into transient solution in ANSYS.