Modal-Model Applications for Large Energetic Machines

Kurowski, Piotr

doi:10.4028/www.scientific.net/kem.347.221

Cited by 5 publications

(4 citation statements)

References 2 publications

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“…Calculations of the stress-strain state of the models were performed using the CosmosM software suite. 25…”

Section: Methodsmentioning

confidence: 99%

Some aspects of biomechanics of the operated thoracolumbar junction following two-level corpectomy

S Nekhlopochyn,

V Verbov,

V Cheshuk

et al. 2024

MOJABB

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Traumatic spinal injuries pose a significant medico-social challenge, with about 60% of all spine fractures occurring at the thoracolumbar junction. Optimizing care for these patients remains a critical issue, despite the development of numerous surgical and conservative treatment methods, with outcomes still far from ideal. A key factor contributing to the consistently high rate of unsuccessful surgical interventions, which lead to stabilization failures in both the early and late postoperative periods, is the disregard of the biomechanical characteristics of the thoracolumbar junction area. Clinical protocols often regulate intervention methods based on the degree and nature of damage to the thoracolumbar spine as a whole. Enhancing the reliability of fixation, while maintaining the number of transpedicular screws, can be significantly achieved by using cross-links and adjusting screw length. The purpose of our study was to investigate the distribution of loads on the metal construct elements and bone structures in the thoracolumbar junction after extensive decompressive-stabilizing interventions. The load was modeled with a backward tilt. A mathematical finite element model of the human thoracolumbar spine segment was developed, incorporating vertebrae Th9-Th11, L2-L5, with Th12-L1 vertebrae removed, as well as elements of the metal construct—interbody support and a transpedicular system. We modeled four variants of transpedicular fixation using both short and long screws that penetrate the anterior surface of the vertebral body, with and without the use of two cross-links. Stress parameters were monitored at 20 control points in the models. Comparative analysis of the results revealed that models including long bicortical screws and two cross-links demonstrated the best biomechanical performance when the torso was tilted backward, effectively reducing stress in critical areas and enhancing the durability and effectiveness of the fixation.

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“…Calculations of the stress-strain state of the models were performed using the CosmosM software suite. 25…”

Section: Methodsmentioning

confidence: 99%

Some aspects of biomechanics of the operated thoracolumbar junction following two-level corpectomy

S Nekhlopochyn,

V Verbov,

V Cheshuk

et al. 2024

MOJABB

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“…Therefore the methods able to overcome this problem are of a great interest. One of such methods is the OMAX that nowadays is more and more frequently applied to operational identification of mechanical structures [4]. The OMAX (Operational Modal Analysis with eXogenous Inputs) [5] method is formulated with an assumption that both measurable and non-measurable forces excite structure.…”

Section: Modification Of the Methods For Rotating Machinerymentioning

confidence: 99%

Applicaton of Modal Filtration for Damage Detection of Rotating Shaft

Mendrok

Bednarz

Uhl

2009

KEM

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The paper describes a modification of the method which uses the modal filtration for damage detection [11] to make it suitable for rotating machinery. Authors have formulated a diagnostic procedure which is based on the output only data measured during object operation. The measurement can be performed both by accelerometers placed on the shaft bearing cages and directly on the shaft with use of the laser vibrometer. The procedure was verified on the experimental data. For the experimental verification authors have used the laboratory stand which allows simulation of different faults.

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“…Моделювання виконано за допомогою системи автоматизованого проєктування «SolidWorks». Розрахунки напружено-деформованого стану моделей здійснено за допомогою програмного комплексу «CosmosM» [11].…”

Section: матеріали та методи дослідженняunclassified

Study of stress distribution under the influence of bending load in models of different options for osteosynthesis of tibia bones with fractures in the middle third of their congenital pseudarthrosis in children with incomplete growth

Korzh,

Khmyzov,

Katsalap

et al. 2023

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Congenital pseudoarthrosis of the bones of the lower leg is a rare disease characterized by the presence of non-union (pseudoarthrosis) of the bones of the lower leg, which does not grow independently. The majority of surgical techniques involve the removal of pathological soft tissues in the zone of pseudarthrosis followed by bone autoplasty and fixation of tibial bone fragments in external fixation devices or with the help of intramedullary fixators. Purpose - to investigate the stress-deformed state of models of the leg in the presence of pseudarthrosis in the middle third under the influence of bending load and their osteosynthesis using intramedullary rods of various designs in children with incomplete growth. Materials and methods. Mathematical modeling of 3 variants of osteosynthesis of lower leg bones with congenital pseudarthrosis in the middle third was performed: 1 - rod without rotational stability; 2 - rod with rotational stability; 3 - rod with rotational stability and blocked movement during compression. The stress-strain state of the models under the influence of a bending load of 300 N was studied. Results. When using a rotationally unstable «growing» rod, maximum stress levels of 18.5 MPa and 23.1 MPa are determined at the proximal and distal ends of the tibia, respectively. In the fracture zone, the stress level is minimal and does not exceed 0.2 MPa. In the diaphyseal part, stresses are determined at the level of 0.3 MPa and 0.4 MPa above and below the fracture zone, respectively. In the zone of the fracture of the fibula, the stress level is also not significant - 0.7 MPa and 0.8 MPa in the proximal and distal fragments. The use of a rod with rotational stability does not lead to any significant changes in the stress-strain state of the model compared to tibial osteosynthesis with a rotationally unstable rod. The use of an intramedullary rod with blocked movement during compression allows to reduce the values of stresses at the proximal and distal ends of the tibia - up to 16.9 MPa and 21.2 MPa, respectively. In all control points of the diaphyseal part of the tibia, the stresses are minimal and equal to 0.2 MPa. It should be noted that in this case the stresses in the area of the fracture of the fibula, where they do not exceed the mark of 0.1 MPa, are almost negligible. Conclusions. Under bending loads, all types of intramedullary rods provide a minimum level of stress in the tibial fracture zone. Additional rotational and longitudinal stability of the rods allow to slightly reduce the level of stress in the proximal and distal ends of the tibia. The research was carried out in accordance with the principles of the Helsinki Declaration. The study protocol was approved by the Local Ethics Committee of the participating institution. The informed consent of the patient was obtained for conducting the studies. No conflict of interests was declared by the authors.

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Modal-Model Applications for Large Energetic Machines

Cited by 5 publications

References 2 publications

Some aspects of biomechanics of the operated thoracolumbar junction following two-level corpectomy

Some aspects of biomechanics of the operated thoracolumbar junction following two-level corpectomy

Applicaton of Modal Filtration for Damage Detection of Rotating Shaft

Study of stress distribution under the influence of bending load in models of different options for osteosynthesis of tibia bones with fractures in the middle third of their congenital pseudarthrosis in children with incomplete growth

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