Optimization winding design of a composites intermediate shaft

2019 ◽  
Vol 33 (14n15) ◽  
pp. 1940030
Author(s):  
Sung-Won Yoon ◽  
Tae-Yeob Kim ◽  
Je-Hyoung Cho ◽  
Jong-Rok Ha ◽  
Yun-Hae Kim
Keyword(s):  
Diameter Ratio ◽  
Filament Winding ◽  
Structural Safety ◽  
Maximum Diameter ◽  
Element Analysis ◽  
Hollow Shaft ◽  
Intermediate Shaft ◽  
The Finite Element Analysis ◽  
Torsional Loads ◽  
Correct Estimation

The purpose of this study is to determine the correct estimation of the laminate patterns for composites intermediate shaft. The laminate patterns in the filament winding process are an important factor in determining the strength and life of the final structure. In this study, the structural safety was analyzed for the laminate patterns in four cases. In addition, this work evaluated the range of laminated angles for optimal thickness selection. The laminate patterns and the order of the layers were determined by considering the results of the finite element analysis. The shear stress equation of the hollow shaft for torsional loads showed that the thickness of the structure varied with the diameter ratio. At the maximum diameter ratio (the smallest shaft thickness), the required shear strength for the structure was 36.6 MPa. Also, the most stable stress distribution was selected at [Formula: see text] to [Formula: see text]. The shear modulus according to the laminated angle was considered to give the best strength value when stacked at [Formula: see text]. The research results in this study suggest that the design of an optimized intermediate shaft of composite materials can be supplemented.

Limit and Burst Pressures for a Cylindrical Vessel With a 30 deg—Lateral d/D⩾0.5

2005 ◽  
Vol 127 (1) ◽  
pp. 61-69 ◽  
Author(s):  
Z. F. Sang ◽  
Y. J. Lin ◽  
L. P. Xue ◽  
G. E. O. Widera
Keyword(s):  
Internal Pressure ◽  
Design Method ◽  
Limit Load ◽  
Diameter Ratio ◽  
Cylindrical Vessel ◽  
Pressure Loading ◽  
Element Analysis ◽  
Design Guideline ◽  
Burst Test ◽  
The Finite Element Analysis

The purpose of this paper is to provide research results for a cylindrical vessel—30 deg lateral intersection with diameter ratio d/D⩾0.5 under increasing internal pressure loading. The results include those from tests as well as from an inelastic stress analysis. The experimentally determined limit load is compared with that from the finite element analysis. The stress concentration factor, the spread of the plastic area, and the behavior of the deformation are provided. Also, a burst test of the model vessel is carried out to provide some data to justify the existing design method and forms a basis for developing an advanced design guideline for cylindrical vessel—lateral intersection under internal pressure loading.

Dynamic Structural Analysis of a Large-Diameter Riser Consisting of Laminated Composite Material With a Hybrid Numerical Scheme

2013 ◽  
Author(s):  
Dongho Jung ◽  
Hyeonju Kim ◽  
Moonho Tak ◽  
Kyungjae Lee ◽  
Taehyo Park
Keyword(s):  
Numerical Scheme ◽  
Large Diameter ◽  
Laminated Composite ◽  
Structural Safety ◽  
Analysis Method ◽  
Element Analysis ◽  
Finite Element Analysis Method ◽  
Global Dynamic ◽  
The Finite Element Analysis ◽  
Laminated Composite Material

A hybrid numerical scheme is developed to analyze the structural dynamic behavior of a large-diameter riser made of a laminated composite material. The global dynamic behavior of the riser, considered as a beam element subjected to a wave and current, is solved with the finite element analysis method in the time domain. The equivalent elastic modulus of a laminated composite riser for the global dynamic analysis is calculated from the stress-strain relation of a laminate structure with a different elastic modulus. For elements in large displacement and stresses estimated from the dynamic analysis, local structural analysis is performed with the finite element analysis method to examine the structural safety of the laminates of the composite riser, which is considered as a hexahedral element. The developed hybrid numerical tool can contribute to structural safety verification of large-diameter risers composed of laminated composites.

scholarly journals A Novel Expanding Mechanism of Gastrointestinal Microrobot: Design, Analysis and Optimization

Micromachines ◽  
2019 ◽  
Vol 10 (11) ◽  
pp. 724 ◽  
Author(s):  
Wei Wang ◽  
Guozheng Yan ◽  
Zhiwu Wang ◽  
Pingping Jiang ◽  
Yicun Meng ◽  
...  
Keyword(s):  
Intestinal Tract ◽  
Layer Structure ◽  
Mechanical Test ◽  
Structure Optimization ◽  
Diameter Ratio ◽  
Intestinal Damage ◽  
Element Analysis ◽  
Variable Diameter ◽  
Double Layer Structure ◽  
The Finite Element Analysis

In order to make the gastrointestinal microrobot (GMR) expand and anchor in the gastrointestinal tract reliably, a novel expanding mechanism of the GMR is proposed in this paper. The overlapping expanding arm is designed to be used to increase the variable diameter ratio (ratio of fully expanded diameter to fully folded diameter) to 3.3, which makes the robot more adaptable to the intestinal tract of different sections of the human body. The double-layer structure of the expanding arm increases the contact area with the intestine, reducing the risk of intestinal damage. The kinematics and mechanical model of the expanding arm are established, and the rigid velocity, rigid acceleration, and expanding force of the expanding arm are analyzed. The elastodynamics model of the expanding arm is established. Through the finite element analysis (FEA), the velocity, acceleration, and the value and distribution of the stress of the expanding arm under elastic deformation are obtained. Based on the elastodynamics analysis, the structure of the expanding arm is optimized. By the structure optimization, the thickness of the expanding mechanism is reduced by 0.4mm, the weight is reduced by 31%, and the stress distribution is more uniform. Through the mechanical test, the minimum expanding force of the expanding mechanism is 1.3 N and the maximum expanding force is 6.5 N. Finally, the robot is tested in the rigid pipeline and the isolated intestine to verify the reliability and safety of the expanding mechanism.

Finite Element Analysis of Structural Safety of a Steel TV Tower

2011 ◽  
Vol 421 ◽  
pp. 217-224
Author(s):  
Yi Sun ◽  
Xiang Dong Shu ◽  
Wen Qi Yang ◽  
Qiao Rong Zhao
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Security Analysis ◽  
Local Area ◽  
Structural Safety ◽  
Element Analysis ◽  
Corrosion Depth ◽  
The Finite Element Analysis ◽  
Tower Structure ◽  
Terrain Effect

The steel truss TV tower structure, the height is 183.1 m, which is built in 1970, was corroded obviously. In order to ensure its structural safety, completely detection and security analysis have been implement. The tower is located in the top of the ridge, and hilly terrain effect was included in the whole structure analysis. Finite element analysis of bar elements was done to inspect whole structure safety. The results show, most of the members were safe, but with the height of 120 m, stress ratio of columns and diagonal braces is large than 1, and can’t meet the requirement of current codes. Additional solid finite element analysis of joint zone shows that, stress in very local area of connection plates reached to the yield stress, but they were safe enough after plastic stress redistribution. According to the results of corrosion depth test, the finite element analysis of structure after corrosion is done. After corrosion, the bearing capacity of columns almost reaches the limitation. The increase of any load or corrosion depth may lead to the failure of columns.

Conceptual Design, Thrust Test, and Finite Element Analysis of a Tip-Jet Rotor Using a Small Turbo-Jet Engine

2006 ◽  
Vol 306-308 ◽  
pp. 541-546
Author(s):  
Nam Seo Goo ◽  
Hoon Cheol Park ◽  
Kwang Joon Yoon
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Power System ◽  
Rotor System ◽  
Structural Safety ◽  
Element Analysis ◽  
Jet Engine ◽  
Combustion Gas ◽  
The Finite Element Analysis ◽  
Reduced Scale

A general helicopter uses rotary power produced from the installed engine in order to get the directional thrust. In the case of a tip-jet rotor helicopter, the compressed air or the combustion gas passes through a duct system inside rotors and is ejected out of the nozzle at the blade tips to produce torque enough for rotation of the rotor system. The generated torque makes the rotor system rotate, so that it can create the directional thrust. Since the anti-torque does not occur in this tip-jet rotorcraft, the tail rotor can be removed, which can be very attractive. In this paper, a power system for a reduced-scale tip-jet rotor by using a small turbo-jet engine is designed and tested for feasibility study. The in-plane thrust that the power system can produce is measured and compared with the calculated one. Finally, the finite element analysis of a conceptually designed tip-jet rotor is performed to ensure structural safety.

scholarly journals Study on Structural Design and Manufacturing of Sandwich Composite Floor for Automotive Structure

Materials ◽  
2021 ◽  
Vol 14 (7) ◽  
pp. 1732
Author(s):  
Hoyeon Lee ◽  
Hyunbum Park
Keyword(s):  
Structural Design ◽  
Maximum Load ◽  
Structural Safety ◽  
Sandwich Composite ◽  
Board Structure ◽  
Analysis Method ◽  
Element Analysis ◽  
Test And Evaluation ◽  
The Finite Element Analysis ◽  
Design And Manufacturing

In this work, structural design and manufacturing of sandwich composite floor for automobile was performed. The tensile and compression strength of specimen were investigated. Based on this, structural design of floor board was performed. The sandwich composite floor board are subject to payload. The maximum load was analyzed in consideration of the safety factor. The structural design and analysis were performed in consideration of applied load. The finite element analysis method was applied to investigate structural safety. The stress, displacement, and buckling analysis was carried out. Through the structural analysis, it was confirmed that the designed floor board structure is safety. Based on the result, the manufacturing of prototype was conducted. Finally, test and evaluation of composite floor board was performed.

Structural Assessment for Bogie Frame of 180km/h Korean Tilting Train

2005 ◽  
Vol 297-300 ◽  
pp. 345-350 ◽  
Author(s):  
Jung Seok Kim ◽  
Nam Po Kim
Keyword(s):  
High Speed ◽  
Load Condition ◽  
Structural Safety ◽  
Element Analysis ◽  
Bogie Frame ◽  
The Finite Element Analysis ◽  
Dynamic Analyses ◽  
Tilting Train ◽  
Multi Body ◽  
Body Dynamic

This paper has performed the fatigue strength evaluation for the bogie frame of Korean tilting train. In order to verify the structural safety of the bogie frame, we firstly investigated the loading condition imposed on the bogie frame. The bogie frame of the tilting train is exposed to the more severe loadings compared with the conventional one because of the tilting of the carbody and the high-speed curve negotiation. We have conducted some multi-body dynamic analyses to extract the load condition by tilting on curve. The finite element analysis is used to obtain the stress distribution. Through this study, we could make sure the safety of the tilting bogie frame.

A two degrees of freedom comb capacitive-type accelerometer with low cross-axis sensitivity

2019 ◽  
Vol 13 (3) ◽  
pp. 5334-5346
Author(s):  
M. N. Nguyen ◽  
L. Q. Nguyen ◽  
H. M. Chu ◽  
H. N. Vu
Keyword(s):  
Degrees Of Freedom ◽  
Proof Mass ◽  
Vibration Modes ◽  
Electrode Structure ◽  
Element Analysis ◽  
Mechanical Coupling ◽  
Fully Differential ◽  
Mode Effects ◽  
The Finite Element Analysis ◽  
Cross Axis

In this paper, we report on a SOI-based comb capacitive-type accelerometer that senses acceleration in two lateral directions. The structure of the accelerometer was designed using a proof mass connected by four folded-beam springs, which are compliant to inertial displacement causing by attached acceleration in the two lateral directions. At the same time, the folded-beam springs enabled to suppress cross-talk causing by mechanical coupling from parasitic vibration modes. The differential capacitor sense structure was employed to eliminate common mode effects. The design of gap between comb fingers was also analyzed to find an optimally sensing comb electrode structure. The design of the accelerometer was carried out using the finite element analysis. The fabrication of the device was based on SOI-micromachining. The characteristics of the accelerometer have been investigated by a fully differential capacitive bridge interface using a sub-fF switched-capacitor integrator circuit. The sensitivities of the accelerometer in the two lateral directions were determined to be 6 and 5.5 fF/g, respectively. The cross-axis sensitivities of the accelerometer were less than 5%, which shows that the accelerometer can be used for measuring precisely acceleration in the two lateral directions. The accelerometer operates linearly in the range of investigated acceleration from 0 to 4g. The proposed accelerometer is expected for low-g applications.

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