Discussion and Dynamic Characteristics of the Offshore Jacket Structure

2014 ◽  
Vol 638-640 ◽  
pp. 322-325
Author(s):  
Yue Zhao ◽  
Duan Duan Zhao ◽  
Qin Han Jiang
Keyword(s):  
Dynamic Characteristics ◽  
Random Vibration ◽  
Dynamic Performance ◽  
Power Spectrum Analysis ◽  
Fatigue Properties ◽  
Connection Form ◽  
The Finite Element Method ◽  
Research Focus ◽  
Calculation Results ◽  
Connection Type

In this paper, based on the finite element method, the K type common jacket structure connection in the form of positive connection and reverse connection conditions is being do comparative analysis. Research focus on dynamic characteristics, including of power spectrum analysis under the action of random vibration and fatigue properties of two kinds of connection type structure. The calculation results show: the inverted K type connection of jacket structure is about 10% increase in the stiffness and the dynamic performance, the inverted K type connection form is more worthy of popularization and application in engineering.

scholarly journals Determining internal forces in modular building elements under action wind load

2018 ◽  
Vol 196 ◽  
pp. 02010
Author(s):  
Viacheslav Shirokov ◽  
Alexey Soloviev ◽  
Tatiana Gordeeva
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Cross Section ◽  
Dynamic Characteristics ◽  
Wind Load ◽  
Wind Loads ◽  
Bending Moments ◽  
The Finite Element Method ◽  
Calculation Results ◽  
Internal Forces

The research paper focuses on internal forces determination in the elements of modular buildings under wind load. It provides a methodology for determining dynamic characteristics of a building and for calculating wind loads. This method is based on the following assumptions: coupling of the modules elements is rigid; coupling of block-modules with foundations is hinged-fixed; connection of blocks to each other is hinged in angular points; the floor disk in its plane is not deformed. On the basis of these assumptions the authors derived approximate and refined equations for determining forces in modules elements under static and pulsation components of wind load. The equation of bending moments determination in the pillar bearing cross-section is obtained by approximation of the graph of moments variation, calculated for the spectrum of the ratio of the pillar stiffness and the floor beam in the range from 1/64 to 64. The paper further introduces the calculation results of forces based on the proposed methodology and on the finite element method. The calculations were done while taking different values of wind load and different number of storeys in a building (from 1 to 4 floors). The obtained results are similar, the error does not exceed 5%.

Analysis of Bridge Pier’s Dynamic Characteristics Considering Fluid-Solid Interface Coupling

2014 ◽  
Vol 1049-1050 ◽  
pp. 464-468
Author(s):  
Chen Hui Jin ◽  
Bo Ming Zhao ◽  
Run Bo Bai
Keyword(s):  
Finite Element ◽  
Dynamic Characteristics ◽  
Dynamic Performance ◽  
Great Influence ◽  
Water Structure ◽  
Natural Vibration Frequency ◽  
Finite Element Software ◽  
Interface Coupling ◽  
Solid Interface ◽  
Calculation Results

In the study of bridge pier’s dynamic characteristics, the modal analysis is the foundation of other dynamic analysis and is of great significance for studying other dynamic performance. Based on the dynamic theory of fluid-solid interface coupling, a 3D water-structure coupling finite element modal is established and computed by ANSYS. To verify the validity of the calculation results, the results of finite element software is compared with the analytical solutions in reference books. The analysis indicated that the results of finite element software are reasonable when the radius of bridge pier is five times the radius of water body. The ratio of water depth and the bridge pier’s height has a great influence on the change scale of bridge pier’s frequency. With the increase of bridge pier’s height-diameter ratio, the first three order natural vibration frequency is reduced.

Dynamic Performance Analysis for a Butterfly-Shaped Arch Bridge

2010 ◽  
Vol 163-167 ◽  
pp. 74-78
Author(s):  
Hai Yun Huang ◽  
Xiang Rong Yuan ◽  
Ka Hong Cai
Keyword(s):  
Dynamic Analysis ◽  
Dynamic Characteristics ◽  
Dynamic Performance ◽  
Three Dimensional ◽  
Element Model ◽  
Loading Test ◽  
Structural Dynamic ◽  
Arch Bridge ◽  
Calculation Results ◽  
Dynamic Performance Analysis

The dynamic characteristics are not only the important indexes for evaluating the bridge structural rigidity, but also the principal parameters for structural dynamic analysis and earthquake resistant analysis. In this paper, a three dimensional solid finite element model for a butterfly-shape arch bridge in Zhongshan city was established to analyze the dynamic characteristics. By comparison the numerical calculation results with measured results of the dynamic loading test, an analysis and evaluation of the dynamic performance of this new type spatial arch bridge was made, and can serve as reference to the dynamic analysis and seismic design of similar bridges.

Isolated Heat Transfer Gaskets for Medium Energy X-Ray Telescope MED Electric Control Box Effect on Random Vibration Performance Study Based on the Finite Element Method

2013 ◽  
Vol 753-755 ◽  
pp. 1812-1815
Author(s):  
Nian Peng Wu ◽  
Chun Ling Meng ◽  
Yun Long Li ◽  
Wen Hua Zhang
Keyword(s):  
Heat Transfer ◽  
Finite Element ◽  
Random Vibration ◽  
Dynamic Performance ◽  
The Finite Element Method ◽  
Performance Study ◽  
X Ray ◽  
Electric Control ◽  
Vibration Performance ◽  
Random Vibration Analysis

In order to understand Isolated Heat Transfer Gaskets placement scheme's influence on the dynamic performance of the MED electric control box,on the basis of theoretical analysis, Finite Element Modal analysis and random vibration analysis have proceeded for different Isolated Heat Transfer Gaskets placement program, and comparative analysis of the two results. Analysis results provide the basis for further optimal design of the MED electric control box.

scholarly journals Dynamics Analysis of the Rigid-Flexible Coupling Lifting Comprehensive Mechanism for a Rotary Dobby

2019 ◽  
Vol 2019 ◽  
pp. 1-14
Author(s):  
Xiaoyong Wei ◽  
Guoguang Jin ◽  
Zhan Wei ◽  
Boyan Chang ◽  
Yanyan Song
Keyword(s):  
Dynamic Model ◽  
Dynamic Performance ◽  
Dynamics Analysis ◽  
The Finite Element Method ◽  
Flexible Coupling ◽  
Modal Synthesis ◽  
Warp Tension ◽  
Calculation Results ◽  
Movement Distance ◽  
Modal Truncation

This paper addresses the problem of dynamics analysis of the rigid-flexible coupling lifting comprehensive mechanism for a rotary dobby, which is the important part of the loom. To provide a physical model basis for a precise dynamics model, the finite element method was used to discretize the bending arm of the rotary dobby effectively. Combining with the modal synthesis techniques, the dynamic model of the bending arm was established by using Kane’s formulation, and it laid a foundation for analyzing the dynamic performance of the heald frame. By comparing virtual prototype simulation results with the numerical calculation results of the bending arm, the correctness of this model was verified. Based on the established dynamic model, the modal truncation method is used to simplify the dynamic model; in addition, the influence of parameters such as the speed of the dobby, the warp tension, the movement distance of the heald frame, and the thickness of the bending arm on the dynamic characteristics of the heald frame was analyzed. Last, the sensitivity analysis (SA) method is used to analyze the effects of each parameter. The results show that it is appropriate to select the first four modes to calculate, and increasing the speed greatly or increasing the warp tension, the shedding performance is obviously worse, while the shedding performance of the loom can be optimized by reducing the shedding range or increasing the thickness of the bending arm.

Stationary and Transient Response of Cylindrical Shells Under Random Excitation

1988 ◽  
Vol 110 (2) ◽  
pp. 205-209
Author(s):  
A. V. Singh
Keyword(s):  
Transient Response ◽  
Random Vibration ◽  
Time History ◽  
Wide Band ◽  
Random Excitation ◽  
Mode Shapes ◽  
The Finite Element Method ◽  
History Of ◽  
The Mean ◽  
Random Vibration Analysis

This paper presents the random vibration analysis of a simply supported cylindrical shell under a ring load which is uniform around the circumference. The time history of the excitation is assumed to be a stationary wide-band random process. The finite element method and the condition of symmetry along the length of the cylinder are used to calculate the natural frequencies and associated mode shapes. Maximum values of the mean square displacements and velocities occur at the point of application of the load. It is seen that the transient response of the shell under wide band stationary excitation is nonstationary in the initial stages and approaches the stationary solution for large value of time.

Research on the Reliability of Box for Gear Test Bed

2011 ◽  
Vol 121-126 ◽  
pp. 1744-1748
Author(s):  
Xiang Yang Jin ◽  
Tie Feng Zhang ◽  
Li Li Zhao ◽  
He Teng Wang ◽  
Xiang Yi Guan
Keyword(s):  
Power Flow ◽  
Dynamic Performance ◽  
Three Dimensional ◽  
Design Parameters ◽  
The Finite Element Method ◽  
Test Bed ◽  
Kinematics Simulation ◽  
Beveloid Gears ◽  
Overall Performance

To determine the efficiency, load-bearing capacity and fatigue life of beveloid gears with intersecting axes, we design a mechanical gear test bed with closed power flow. To test the quality of its structure and predict its overall performance, we establish a three-dimensional solid model for various components based on the design parameters and adopt the technology of virtual prototyping simulation to conduct kinematics simulation on it. Then observe and verify the interactive kinematic situation of each component. Moreover, the finite element method is also utilized to carry out structural mechanics and dynamics analysis on some key components. The results indicate that the test bed can achieve the desired functionality, and the static and dynamic performance of some key components can also satisfy us.

Dynamics Characteristics for Contact Surface of Machine Tool

2014 ◽  
Vol 538 ◽  
pp. 91-94
Author(s):  
Wei Ping Luo
Keyword(s):  
Machine Tool ◽  
Dynamic Characteristics ◽  
Contact Surface ◽  
Dynamic Performance ◽  
Virtual Prototype ◽  
Prototype Model ◽  
Ansys Software ◽  
Dynamic Analyses ◽  
Contact Surfaces

A virtual prototype model of Machine Tool has been constructed by using the Pro/E software and the ANSYS software. Considering the effects of contact surfaces, dynamic analyses of Machine Tool are studied. The effects of contact surfaces on the dynamic characteristics of machine tool are studied. So that the purpose predicting and evaluating synthetically the machine tool dynamic performance without a physical sample can be achieved.

Analysis and Optimization of the Static and Dynamic Characteristics of Head Frame

2011 ◽  
Vol 418-420 ◽  
pp. 2055-2059 ◽  
Author(s):  
Yu Lin Wang ◽  
Na Jin ◽  
Kai Liao ◽  
Rui Jin Guo ◽  
Hu Tian Feng
Keyword(s):  
Machine Tool ◽  
Dynamic Characteristics ◽  
Maximum Stress ◽  
Dynamic Performance ◽  
Mode Shapes ◽  
Cnc Machine ◽  
Static And Dynamic Characteristics ◽  
Maximum Deformation ◽  
Improvement Measures ◽  
Optimal Measure

The head frame is a key component which plays a supportive and accommodative role in the spindle system of CNC machine tool. Improving the static and dynamic characteristics has profound significance to the development of machine tool and product performance. The simplified finite element modal is established with ANSYS to carry out the static and modal analysis. The results showed that the maximum deformation of the head frame was 0.0066mm, the maximum stress was 3.94Mpa, the deformation of most region was no more than 0.0007mm, which all verified that the head frame had a good stiffness and deforming resistance; several improvement measures for dynamic performance were also proposed by analyzing the mode shapes, and the 1st order natural frequency increased 7.33% while the head frame mass only increased 1.58% applying the optimal measure, which improved the dynamic characteristics of the head frame effectively.

scholarly journals Research on Coupled Dynamic Model of Tracked Vehicles and Its Solving Method

2015 ◽  
Vol 2015 ◽  
pp. 1-10
Author(s):  
Yuliang Li ◽  
Chong Tang
Keyword(s):  
Dynamic Performance ◽  
Tractive Force ◽  
Actual Structure ◽  
Discrete Method ◽  
Tracked Vehicles ◽  
Coupled Equations ◽  
Calculation Results ◽  
Dynamic Software ◽  
Multi Body ◽  
Body Dynamic

In order to conveniently analyze the dynamic performance of tracked vehicles, mathematic models are established based on the actual structure of vehicles and terrain mechanics when they are moving on the soft random terrain. A discrete method is adopted to solve the coupled equations to calculate the acceleration of the vehicle’s mass center and tractive force of driving sprocket. Computation results output by the model presented in this paper are compared with results given by the model, which has the same parameters, built in the multi-body dynamic software. It shows that the steady state calculation results are basically consistent, while the model presented in this paper is more convenient to be used in the optimization of structure parameters of tracked vehicles.

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