Dynamic Analysis of an Offshore Platform With Excessive Vibration Under Wave Loading

2003 ◽  
Author(s):  
Chunyan Ji ◽  
Huajun Li ◽  
Shuqing Wang
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Dynamic Characteristics ◽  
Model Experiment ◽  
Offshore Platform ◽  
Normal Operation ◽  
Bohai Bay ◽  
Fe Modeling ◽  
Wave Loading ◽  
Relative Movement

An offshore platform of jacket type in Bohai Bay vibrates excessively under design environmental conditions, which has affected the normal operation of the platform. In order to mitigate the vibration of the platform, it is essential important to explore the cause of the vibration. So the objective of this study is to investigate the cause of the excessive vibration. In this paper, dynamic characteristics of the offshore platform are analyzed by numerical simulation using finite element (FE) modeling. To further verify the numerical results, a model experiment is conducted. Numerical and experimental results demonstrate that there are relative movement and impact between the piles and the jacket, i.e. the piles and the jacket didn’t connect well to an entity. It is this cause that the stiffness of the platform deceases and impact between piles and the jacket legs induce excessive vibration. And also the grouting measure is advised to reduce the vibration of the offshore platform according to the analysis results.

Study on the Mechanical Properties of Sapphire by Numerical Simulation and Nanoindentation Technology

2009 ◽  
Vol 69-70 ◽  
pp. 103-107 ◽  
Author(s):  
Ke Hua Zhang ◽  
Dong Hui Wen ◽  
Tao Hong ◽  
Ju Long Yuan
Keyword(s):  
Mechanical Properties ◽  
Numerical Simulation ◽  
Finite Element Method ◽  
Finite Element ◽  
Plastic Region ◽  
Nanoindentation Test ◽  
Fe Modeling ◽  
The Finite Element Method ◽  
Simulation And Experiment ◽  
Abrasive Process

This paper presents a finite element (FE) modeling of the nanoindentation test of sapphire, in which the finite element method was employed to study the mechanical characteristic of sapphire under the nanoindentation process. The results demonstrated that the nanoindentation FE models were able to simulate the indentation loading-unloading curves of the sapphire. The load and unload displacement curves of the simulation and experiment results can match with each other well, and then the properties used in the simulation should be the actual properties of the sapphire. The Mises stress field distribution of the sapphire sample was calculated to reveal the alteration from elastic region to plastic region, which are useful for indentifying the ductile to brittle change in the sapphire abrasive process.

Investigations Into the Experimental and Numerical Simulation of a Shaping Machine

1996 ◽  
Author(s):  
Vijay Reddy ◽  
P. T. Rajeev ◽  
V. Ramamurti ◽  
R. Madhusudan
Keyword(s):  
Numerical Simulation ◽  
Finite Element Method ◽  
Finite Element ◽  
Dynamic Characteristics ◽  
Mechanical Model ◽  
Material Removal ◽  
Machining Accuracy ◽  
Acceleration Response ◽  
Shell Elements ◽  
Optimal Machine

Abstract One of the main requirements for efficient and economical material removal is optimal machine tool design. The main objective of this paper is to investigate the dynamic characteristics of a shaping machine using finite element method. In the first part, experimentation and computation are combined to formulate and validate the mechanical model of the shaper. A parametric study is done in the second part. The main housing along with the ram of a typical shaper is analyzed during the process of shaping. This assembly is modeled using triangular shell elements. The eigenvalues and the eigenvectors are obtained. There is an acceptable degree of agreement between analytical results and the experimental observations. The cutting force is determined experimentally and using this the response of the shaping machine is determined. The dynamic acceleration response so obtained is compared with the experimentally obtained response. An exhaustive stress analysis is done. The system is sensitive to changes in certain parameters which are identified and analyzed, with optimization of the structural weight and machining accuracy being the criteria.

The Finite Element Analysis and Experimental Study of Fly Ash Embankment Reinforcement

2012 ◽  
Vol 188 ◽  
pp. 193-198
Author(s):  
Hu Mei Wang ◽  
Yang Wang ◽  
Lin Huang
Keyword(s):  
Numerical Simulation ◽  
Finite Element Analysis ◽  
Experimental Study ◽  
Finite Element ◽  
Fly Ash ◽  
Model Experiment ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Positive Effect

This paper presents the effect of two-directional reinforced with geogrid on the performance of embankment, and carries out model experiment and numerical simulation on fly ash embankment. Finally, the curve of relationship among the embankment deformation, the amount of reinforcement and reinforced position was obtained. In addition, the optimum geogrids-reinforced project was also disscussed. The disscussion has some positive effect on the design of reinforced embankment of fly ash.

Reinforcement of Structures with Composite Materials

2019 ◽  
Vol 974 ◽  
pp. 535-541
Author(s):  
Galina M. Kravchenko ◽  
Elena V. Trufanova ◽  
Artem S. Osadchiy ◽  
Alina Sazonova
Keyword(s):  
Mechanical Properties ◽  
Numerical Simulation ◽  
Finite Element Method ◽  
Finite Element ◽  
Composite Materials ◽  
Dynamic Characteristics ◽  
Strain State ◽  
Physical And Mechanical Properties ◽  
The Finite Element Method ◽  
New Materials

The aim of the work is to study the ways to strengthen the elements of the parametric architecture object framework based on the use of the new materials. The problem of strengthening the elements of the building frame is particularly relevant in connection with the development of the parametric architecture. Unlike the traditional methods of regulation and amplification, composite materials allow to change the stress-strain state and improve the dynamic characteristics of the parametric architecture object without increasing its own structures weight. The studies were performed using numerical simulation by the finite element method. Recommendations are given on the use of the physical and mechanical properties of the composite materials when strengthening the building framework.

The TLCD U-Tube Liquid Sloshing Finite Element Modal Analysis

2013 ◽  
Vol 694-697 ◽  
pp. 350-353
Author(s):  
Jie Sun ◽  
Gong Yu Li ◽  
Lang Liu ◽  
Qing Bo Liu
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Modal Analysis ◽  
Dynamic Characteristics ◽  
Simulation Method ◽  
Liquid Sloshing ◽  
Rectangular Container ◽  
Numerical Simulation Method ◽  
Sloshing Frequency ◽  
Finite Element Numerical Simulation

The paper studies the dynamic characteristics of liquid sloshing in TLD rectangular container, and verifies the feasibility of finite element numerical simulation, by the theory and finite element numerical simulation of liquid sloshing. Similarly employing the verified numerical simulation method, we get the sloshing frequency and mode of liquid sloshing in TLCD u-tube container.

Numerical Simulation of Tire Sliding Events Involving Impacts with Holes and Bumps

1986 ◽  
Vol 14 (2) ◽  
pp. 125-136 ◽  
Author(s):  
Y. Nakajima ◽  
J. Padovan
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Finite Element Simulation ◽  
Full Range ◽  
Arbitrary Geometry ◽  
Operating Environments ◽  
Element Simulation ◽  
Simulation Scheme

Abstract This paper extends the finite element simulation scheme to handle the problem of tires undergoing sliding (skidding) impact into obstructions. Since the inertial characteristics are handled by the algorithm developed, the full range of operating environments can be accommodated. This includes the treatment of impacts with holes and bumps of arbitrary geometry.

The study of the elastic deformation of a flexible wheel by a cam wave generator

2020 ◽  
Vol 65 (1) ◽  
pp. 51-58
Author(s):  
Sava Ianici
Keyword(s):  
Numerical Simulation ◽  
Finite Element Method ◽  
Finite Element ◽  
Elastic Deformation ◽  
Theoretical Study ◽  
Elastic Field ◽  
The Finite Element Method ◽  
Elastic Deformations ◽  
Wave Generator ◽  
Two Stages

The paper presents the results of research on the study of the elastic deformation of a flexible wheel from a double harmonic transmission, under the action of a cam wave generator. Knowing exactly how the flexible wheel is deformed is important in correctly establishing the geometric parameters of the wheels teeth, allowing a better understanding and appreciation of the specific conditions of harmonic gearings in the two stages of the transmission. The veracity of the results of this theoretical study on the calculation of elastic deformations and displacements of points located on the average fiber of the flexible wheel was subsequently verified and confirmed by numerical simulation of the flexible wheel, in the elastic field, using the finite element method from SolidWorks Simulation.

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