scholarly journals Sealing Mechanics Study of Laryngeal Mask Airways via 3D Modeling and Finite Element Analysis

2021 ◽  
Author(s):  
Hongxia Liao ◽  
Liqiang Chen ◽  
Junfeng Chen
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Cuff Pressure ◽  
3D Models ◽  
Laryngeal Mask ◽  
Comprehensive Understanding ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Sealing Mechanism ◽  
Mucosal Pressure

Abstract Background: Proper sealing of laryngeal mask airways (LMAs) is critical for airway management in clinical use. A good understanding of the LMA sealing mechanism provides a scientific foundation to improve the sealing of LMAs to reduce the incidence of adverse events. However, no existing methods provide a systematic study on the LMA sealing mechanics. Methods: Computer-aided 3D models are established to visualize LMA – pharynx interactions directly. The finite element analysis (FEA) is adopted to study the LMA sealing mechanics. Results: Two case studies are provided in the paper. The LMA is loaded with a low cuff pressure (CP) (9 mmHg) to investigate the cause of leaking in Case I, and with a high CP (45 mmHg) to detect the critical points of high mucosal pressure in Case II. The established 3D models provide initiative visualization of the sealing situations. The visualization results are verified by pressure distribution along the contacting surface generated from FEA as the quantitative study. Conclusions: Compared with the existing methods, the proposed method does not introduce additional cost, and can provide globe monitoring on the LMA and a comprehensive understanding of sealing mechanics in all areas. The findings on the sealing mechanism and corresponding suggestions for clinic use of LMAs and LMA design have also been presented in the paper.

A Study on Sealing Mechanism of Butterfly Valve

2006 ◽  
Vol 326-328 ◽  
pp. 1259-1262 ◽  
Author(s):  
Sun Chul Huh ◽  
Yong Gil Jung ◽  
Won Jo Park ◽  
Jae Joon Sim
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Working Condition ◽  
Seal Ring ◽  
Butterfly Valve ◽  
Dimensional Model ◽  
Element Analysis ◽  
Ring Shape ◽  
The Finite Element Analysis ◽  
Sealing Mechanism

Small Butterfly valve is specially designed for use in industry field and ship. The important parts of butterfly valve are composed of disk, stem and body. But, like LNG ship, in enviroment of low temperature, as working condition deteriorates, important of sealing more increased. In this study, we examine sealing mechanism of butter valve on the base of FEM and investigate sealing life by measurement. The finite element analysis was carried out to study the effect of the seal ring shape on bi-directional sealing force of valve. The sealing mechanism was evaluated by 2-dimensional model in order to save the analysis time. And these analyses used by material non-linearity and contact element were implemented.

Lumbosacral fusion terminated to S1 for adult degenerative scoliosis: Technical innovation and finite element analysis

2020 ◽  
Author(s):  
Zheng Zhao ◽  
Huiqiang Hu ◽  
Jianwei Guo ◽  
Kun Dai ◽  
Chaoying Wang ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
3D Models ◽  
Lateral Flexion ◽  
Degenerative Scoliosis ◽  
Element Analysis ◽  
Significant Difference ◽  
Flexion Extension ◽  
The Finite Element Analysis

Abstract Background: To evaluated the practicability and reliability of CBT+TT in the treatment of ADS by finite element analysis and the comparison of clinical effects.Methods: 18 cases were enrolled from patients who were admitted to the department of Spine Surgery in Affiliated Hospital of Qingdao University with a strict standard which qualify for the surgical indications of L5-S1 long segment fusion. Based on different spinal-pelvic fusion techniques, those cases were divided into three groups including the groups of IS , S2AI and CBT+TT, 3, 4 and 11 cases recpectively. Clinical data of CBT+TT group such as VAS, ODI, coronal Codd angle, C7PL-CSVL and SVA were acquired preoperatively and compared with those measured at the end of follow-up. DICOM data of CT scan (1mm) of all postoperative patients in those 3 groups were used to created 3D models. The models were imported into software for the finite element analysis under different conditions such as flexion, extension, lateral flexion and rotation, to obtain the stress distribution properties of three fusion techniques.Results: In CBT+TT group, the VAS score was 7.00±0.89 preoperatively and 0.91±0.70 at the end of follow-up. The ODI was 51.09±7.83% and 5.45±1.13%. There was a significant difference between the preoperative data and that at the end of follow-up (P<0.001). The Cobb angle was 49.10±11.51° and 12.33±3.96°. C7PL-CSVL was 27.27±17.61 mm and 12.20±8.04 mm. SVA was 25.33±18.21 mm and 8.60±5.31 mm. The results of the finite element analysis of simulated conditions, such as flexion, extension, lateral flexion and rotation, showed that in the IS group, the average extreme pressure value was 366.1 MPa, 183.1 MPa, 398.4 MPa, and 573.6 MPa; in the S2AI group, the values were 518.4 MPa, 259.2 MPa, 608.2 MPa, and 545.7 MPa; and in the CBT+TT group, the values were 390.0 MPa, 195.0 MPa, 353.7 MPa, and 476.8 MPa. Conclusion: This innovative technique (CBT+TT, terminating at S1) has been proven to be reliable and practical in the treatment of degenerative scoliosis.

Interactive Graphics for the Analysis of Tires

1985 ◽  
Vol 13 (3) ◽  
pp. 127-146 ◽  
Author(s):  
R. Prabhakaran
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Approximate Solutions ◽  
Interactive Graphics ◽  
Element Analysis ◽  
Analysis Process ◽  
Physical Problems ◽  
The Finite Element Analysis ◽  
Analysis Computer ◽  
Discretization Technique

Abstract The finite element method, which is a numerical discretization technique for obtaining approximate solutions to complex physical problems, is accepted in many industries as the primary tool for structural analysis. Computer graphics is an essential ingredient of the finite element analysis process. The use of interactive graphics techniques for analysis of tires is discussed in this presentation. The features and capabilities of the program used for pre- and post-processing for finite element analysis at GenCorp are included.

Finite Element Analysis of Nonuniformity of Tires with Imperfections5

2007 ◽  
Vol 35 (3) ◽  
pp. 226-238 ◽  
Author(s):  
K. M. Jeong ◽  
K. W. Kim ◽  
H. G. Beom ◽  
J. U. Park
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Three Dimensional ◽  
Element Model ◽  
Radial Force ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Dimensional Finite Element ◽  
Force Variation ◽  
Three Dimensional Finite Element

Abstract The effects of variations in stiffness and geometry on the nonuniformity of tires are investigated by using the finite element analysis. In order to evaluate tire uniformity, a three-dimensional finite element model of the tire with imperfections is developed. This paper considers how imperfections, such as variations in stiffness or geometry and run-out, contribute to detrimental effects on tire nonuniformity. It is found that the radial force variation of a tire with imperfections depends strongly on the geometrical variations of the tire.

Use of the Finite Element Analysis Method in Pedodontics

2018 ◽  
Vol 55 (4) ◽  
pp. 666-675
Author(s):  
Mihaela Tanase ◽  
Dan Florin Nitoi ◽  
Marina Melescanu Imre ◽  
Dorin Ionescu ◽  
Laura Raducu ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Structural Model ◽  
Analysis Method ◽  
Ansys Software ◽  
Concentrated Force ◽  
Element Analysis ◽  
Finite Element Analysis Method ◽  
The Finite Element Analysis ◽  
Solid Type

The purpose of this study was to determinate , using the Finite Element Analysis Method, the mechanical stress in a solid body , temporary molar restored with the self-curing GC material. The originality of our study consisted in using an accurate structural model and applying a concentrated force and a uniformly distributed pressure. Molar structure was meshed in a Solid Type 45 and the output data were obtained using the ANSYS software. The practical predictions can be made about the behavior of different restorations materials.

A necessary modification for the finite element analysis of cracked members detection, construction, and justification

2013 ◽  
Vol 83 (7) ◽  
pp. 1087-1096 ◽  
Author(s):  
A. Ranjbaran ◽  
H. Rousta ◽  
M. O. Ranjbaran ◽  
M. A. Ranjbaran ◽  
M. Hashemi ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Cracked Members

Modeling and experimental verification on directivity of an electret cell array loudspeaker

2012 ◽  
Vol 24 (3) ◽  
pp. 326-333 ◽  
Author(s):  
Yu-Chi Chen ◽  
Wen-Ching Ko ◽  
Han-Lung Chen ◽  
Hsu-Ching Liao ◽  
Wen-Jong Wu ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Three Dimensional ◽  
Digital Control System ◽  
Analysis Model ◽  
Cell Array ◽  
Element Analysis ◽  
Finite Element Analysis Model ◽  
The Finite Element Analysis ◽  
Directivity Characteristics

We propose a model to give us a method to investigate the characteristic three-dimensional directivity in an arbitrarily configured flexible electret-based loudspeaker. In recent years, novel electret loudspeakers have attracted much interest due to their being lightweight, paper thin, and possessing excellent mid- to high-frequency responses. Increasing or decreasing the directivity of an electret loudspeaker makes it excellent for adoption to many applications, especially for directing sound to a particular area or specific audio location. Herein, we detail a novel electret loudspeaker that possesses various directivities and is based on various structures of spacers instead of having to use multichannel amplifiers and a complicated digital control system. In order to study the directivity of an electret loudspeaker based on an array structure which can be adopted for various applications, the horizontal and vertical polar directivity characteristics as a function of frequency were simulated by a finite-element analysis model. To validate the finite-element analysis model, the beam pattern of the electret loudspeaker was measured in an anechoic room. Both the simulated and experimental results are detailed in this article to validate the various assertions related to the directivity of electret cell-based smart speakers.

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