Prof. Daniel C Comeaga Profile

Prof. Daniel C Comeaga

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Publications (3)

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Proceedings Article | 12 June 2024 Paper

Base plate resonance frequencies determination via a laser vibrometer: EMA, FEA, and CrossMac validation

Andrei-Florentin Vasiliu, Eduard-Sebastian Csukas, Paul-Iulian Virga, Daniel Comeaga

Proceedings Volume 13187, 131870F (2024) https://doi.org/10.1117/12.3021348

KEYWORDS: Mode shapes, Vibration, Head, Finite element methods, Modal analysis, Laser frequency, Doppler effect, 3D modeling, Visualization, Vibrometry

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The paper in question implicitly focusses on validating component eigen frequencies, modal shapes, and damping characteristics within a display base plate component by using experimental modal analysis (EMA) and finite element analysis (FEA). Following this, a 3D component modal simulation results obtained prior physical measurements was performed using Ansys software, extracting eigen frequencies and modal shapes. This fundamental engineering method together with a laser vibrometer monitoring system was used to investigate structures and systems dynamic behavior, understanding vibration phenomena, extracting linear elastic mechanical proprieties through direct measurements, aiding in evaluating base line design structural integrity with the purpose of optimizing the further design. Subsequently, the resonance frequencies obtained from both EMA and FEA were input into Ansys software to perform a comparative study using the Cross Modal Assurance Criterion (CrossMac) method, revealing the level of agreement between them. The comparative analysis revealed a significant correlation between the experimentally eigen frequencies obtained based on laser vibrometer monitoring and obtained by FEA, confirming the precision and utility of the CrossMac method in anticipating the modal characteristics of the tested component. The validation carried out through this method strengthens confidence in the combined approach of EMA with laser vibrometer monitoring and FEA, highlighting the importance of this combination, for a dynamical structural deeper behavior understanding and to strive towards its continual improvement to perfection.

Proceedings Article | 12 June 2024 Paper

Precision evaluation of a laser scalpel prototype: comprehensive testing and compensation analysis for laser spot control

E. Nita, D. Comeaga, M. Avram

Proceedings Volume 13187, 131870D (2024) https://doi.org/10.1117/12.3021517

KEYWORDS: Actuators, Laser processing, Video processing, Surgery, Beam controllers, Video, Prototyping, Optomechatronics, Image processing, Vibration

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The article proposes the creation of an image processing application dedicated to laser spot detection, along with an experimental setup designed for the scrutiny of laser spot control. In the conclusive phase of testing the optomechatronic device, a specialized setup was intricately crafted for the precise analysis of the laser spot's position. This experimental arrangement involves the device projecting a laser spot onto graph paper positioned 1.5m away. Horizontally positioned on the shaker, controlled vibrations are imparted to the base of the laser scalpel prototype. A high-resolution video camera captures the laser spot's movement at 2160p and 60 frames per second. Following the tests, MATLAB is employed for video processing, revealing the nuances of the laser spot's motion. The initial test introduces a 10 Hz sinusoidal signal to the shaker, inducing oscillations in the laser spot on the graph paper. A brief video, comprising around 660 frames, is recorded, and subsequently processed to validate the optical processing procedure. This comprehensive methodology establishes a robust foundation for assessing the device's performance, ensuring precise compensation for induced vibrations during laser operation. The experimental findings highlight the efficacy of the proposed mechanism in augmenting the precision and stability of laser-based tools, thereby laying the groundwork for advancements in minimally invasive medical interventions.

Proceedings Article | 12 June 2024 Paper

Integrated approach to precision instrumentation: design, modeling, and experimental validation of a compliant mechanical amplifier for laser scalpel prototype

E. Nita, D. Comeaga, M. Avram

Proceedings Volume 13187, 131870C (2024) https://doi.org/10.1117/12.3021501

KEYWORDS: Actuators, Compliance, Design, Mathematical modeling, Finite element methods, MATLAB, Deformation, Surgery, Error analysis, Tissues

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The authors propose the development of a three-degree-of-freedom hand vibration compensation device, featuring a compliant mechanical structure incorporating three stack-type piezoelectric actuators. Inspired by the Stewart-type mobile platform, the system employs this design to manipulate a laser beam in two directions. Moreover, it facilitates an optimal axial stroke, ensuring precise laser beam focusing. This paper details the comprehensive process, encompassing modeling, simulation, and experimental trials, of a compliant mechanical amplifier designed for powering an innovative laser scalpel prototype. The active tremor damping capability of the proposed system is thoroughly examined, shedding light on its potential applications in medical settings. The authors employed a mechatronic approach, integrating mathematical models, MATLAB simulations and finite element analysis (FEA). Mathematical models were utilized to capture the static deformation of the compliant mechanical structure, providing a theoretical foundation for the subsequent stages of development. MATLAB simulations were then conducted to validate and refine the theoretical models, ensuring their accuracy in representing the system's behavior under various conditions. To further enhance the robustness of the design, finite element analysis (FEA) was employed to validate the structural integrity and performance of the proposed device. This simulation tool allowed for a detailed examination of stress distribution, deformation patterns, and overall mechanical response, guiding refinements to optimize the system's functionality. Expanding upon this, the research underscores the significance of mitigating hand tremors in surgical procedures, emphasizing the practical implications of the developed device.

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