Finite Element Analysis of Air Cooler Using Equivalent Static Method and Response Spectrum Method Respectively

2011 ◽  
Vol 250-253 ◽  
pp. 2955-2958
Author(s):  
Shao Qing Hu ◽  
Bai Tao Sun
Keyword(s):  
Finite Element ◽  
Static Load ◽  
Response Spectrum ◽  
Element Model ◽  
Response Spectrum Method ◽  
Element Analysis ◽  
Spectrum Method ◽  
Equivalent Static Load ◽  
Air Cooler ◽  
Response Method

Based on the characteristic of cooler frame, the finite element model of air cooler frame is established using ANSYS software. Equivalent static load method and response spectrum method were used for the seismic performance analysis of cooler frame. The equivalent static load is applied at the center of gravity of various masses using MPC184 rigid beam for transferring the load. The deformation and stress of cooler using equivalent static load method are larger than that of cooler using spectrum response method. For this reason, it can be said that the equivalent static load method is more conservative. At last the deformations and stresses of cooler frame using two methods are checked by ASME AG-1 specification. The results showed that the deformation and stress of cooler frame meet the requirements.

Dynamic Finite Element Analysis of RCC Gravity Dam

2011 ◽  
Vol 346 ◽  
pp. 75-79
Author(s):  
Xiao Yan Zhang ◽  
Ze Li ◽  
Liang Wu
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Natural Vibration ◽  
Response Spectrum ◽  
Gravity Dam ◽  
Response Spectrum Method ◽  
Element Analysis ◽  
Dynamic Finite Element ◽  
Spectrum Method ◽  
Dynamic Finite Element Analysis

Dynamic finite element analysis for a RCC gravity dam is implemented by using response spectrum method in this paper. Firstly, three-dimensional finite element model is established, and then the subspace iterative method is used in the modal analysis of the gravity dam. The natural vibration frequencies, the natural vibration period and modes are obtained. The response spectrum method is employed to implement dynamic analysis of the gravity dam. At last, the combinations of both the static and dynamic stress are made with the principle for extreme strength condition, seismic dynamic response of the dam is investigated.

Finite Element Analysis of the Screen Box of the Combined Vibrating Screen Based on ANSYS

2011 ◽  
Vol 128-129 ◽  
pp. 1316-1320
Author(s):  
Nian Qin Guo ◽  
Wei Liu ◽  
Wei Ping Huang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Static Load ◽  
Natural Frequencies ◽  
Element Model ◽  
Characteristic Analysis ◽  
Element Analysis ◽  
Vibrating Screen ◽  
Stress And Deformation ◽  
The Finite Element Model

The finite element model of the combined vibrating screen was established by using ANSYS. Modal characteristic analysis and static analysis on the whole unit of screen box were done, and natural frequencies and modal shapes in the top 15 orders were obtained, distribution regularities of stress and deformation of each part of the screen box under the static load were revealed, providing the necessary basis for the improvement design and research on screen box.

Finite Element Analysis of Air Cooler Used in Nuclear Power Station

2011 ◽  
Vol 194-196 ◽  
pp. 1982-1985
Author(s):  
Shao Qing Hu ◽  
Yong Li Zhang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Nuclear Power ◽  
Element Model ◽  
Load Case ◽  
Power Station ◽  
Element Analysis ◽  
Operating Load ◽  
Air Cooler ◽  
The Finite Element Model

According to the characteristics of cooler, the finite element model of air cooler is established using ANSYS f software. The force and moment are acted on nozzles using MPC184 element. The first natural frequency is given. Then the stresses of cooler under normal operating load case and under accidental load case are calculated respectively. The stresses of nozzles and foot were checked according to RCC-M specification and meet the requirements.

A Forced Response Method for Annular Combustors Excited by Traveling Acoustic Pressure Waves

2008 ◽  
Author(s):  
Sanghum Baik ◽  
Mehmet Dede
Keyword(s):  
Finite Element ◽  
Pressure Wave ◽  
Acoustic Pressure ◽  
Response Prediction ◽  
Element Model ◽  
Forced Response ◽  
Response Analysis ◽  
Element Analysis ◽  
Variable Theory ◽  
Response Method

Recent progress in the development of an industry level tool for computing forced response of annular combustors is presented. Hereby, in addressing productivity issues caused by huge finite element model of full-wheel combustor, the theoretical framework of cyclic symmetry is introduced. The complex-variable theory, which originated for capturing natural frequency and mode shape characteristics of rotationally periodic structure, was extended for real-number-based finite element analysis (FEA) to solve forced response problem; specifically, a systematic method was developed to create cyclic domain replica of traveling pressure wave loading on full-wheel combustor. In this paper, theoretical descriptions of the physics-based, practical forced response analysis technique will be provided, and its implementation into building the tool of industrial level will be discussed. The technology developed herein will be verified using a simple cylindrical structure that is excited by acoustic pressure wave that travels in circumferential direction with a certain number of nodal diameter. In the end, a practical application to forced response prediction of a combustor component will be presented.

Seismic Performance Analysis of Continuous Rigid Frame Bridge with High-Piers and Long-Span

2014 ◽  
Vol 1065-1069 ◽  
pp. 902-907
Author(s):  
Lou He ◽  
He Ping Hu ◽  
Chang Qing Guo
Keyword(s):  
Finite Element ◽  
Seismic Performance ◽  
Dynamic Characteristics ◽  
Response Spectrum ◽  
Response Spectrum Method ◽  
Spectrum Method ◽  
Long Span ◽  
Continuous Rigid Frame Bridge ◽  
Rigid Frame ◽  
Rigid Frame Bridge

The dynamic characteristics of Tukan Wujiang Bridge are analyzed numerically. The bridge, which is still under construction, is a continuous rigid frame bridge with high-piers and long-span in Wulong County, Chongqing, China. A spatial finite element model is established for the bridge with the finite element software ABAQUS. The natural vibration characteristics and effective modal participation mass of the bridge in the built-up case is obtained. The variation of dynamic characteristics of continuous rigid frame bridge subjected to the dynamic earthquake loading is studied, and the number of modes necessary to the vibration mode combination when applying the response spectrum method under the earthquake is obtained. In addition, the seismic response of the bridge is analyzed with both the response spectrum method and the time-history method, and the maximum response of structure under various probability of earthquake is obtained. The results of the two methods are compared. The comprehensive seismic performance of the bridge is analyzed and evaluated. The results show that the seismic performance of the rigid frame bridge satisfies the expected design performance.

Structural design and seismic qualification of extra high voltage disconnect switch

1986 ◽  
Vol 13 (4) ◽  
pp. 485-497
Author(s):  
R. Kar
Keyword(s):  
Finite Element ◽  
High Voltage ◽  
Structural Design ◽  
Response Spectrum ◽  
Time History ◽  
Element Model ◽  
Mode Shapes ◽  
Element Analysis ◽  
Extra High Voltage ◽  
Disconnect Switch

This paper describes the structural design approach and the method of seismic qualification for an extra high voltage disconnect switch, a vital component in the substations of a power system network. Shaping and sizing of porcelain members of the frame received special attention to enhance their resistance to earthquake. A carefully developed finite element model, on analysis by response spectrum and time-history methods, showed acceptable seismic performance and an adequate margin of safety. Shake table tests for seismic qualification, called for by the specification, were not feasible owing to the large dimensions of the complete assembly. The alternative approach was to perform in situ modal tests. By exciting the structure with a random force through a portable hydraulic exciter and using accelerometers to record the structural response, the dynamic characteristics of the equipment — the frequencies, mode shapes, and damping — were determined. Correlation between the results of finite element analysis and experimental modal analysis confirmed the validity of the analytical model. Application of combined analysis and testing for seismic qualification is demonstrated by a case study on an 800 kV disconnect switch.

Finite Element Analysis of Seismic Responses of a Large-Cantilever Stadium Structure

2014 ◽  
Vol 580-583 ◽  
pp. 1786-1789
Author(s):  
Ze Yu Sun ◽  
Qiao Jin ◽  
Lian Guang Jia ◽  
Qiang Wang ◽  
Yi Ma ◽  
...  
Keyword(s):  
Finite Element ◽  
Response Spectrum ◽  
Three Dimensional ◽  
Element Model ◽  
Computational Results ◽  
Response Spectrum Analysis ◽  
Element Analysis ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element ◽  
Horizontal Displacements

In this paper, based on the Midas/gen platform, a three-dimensional finite element model (FEM) for a transfinite stadium with a large-span and large-cantilever roof , located in Shenyang, was used to study its potential responses to seismic activities. In the numerical analysis, an earthquake spectrum stipulated by the Chinese Seismic Code (GB50011-2010) was adopted to calculate the bidirectional horizontal displacements by the Complete Quadratic Combination (CQC) method on the basis of the response spectrum analysis. The computational results indicate that the maximum displacements in both of the two horizontal directions locate at the top of this structure, i.e. the transfinite part of the roof.

КОНСТРУКТИВНО-ТЕХНОЛОГІЧНІ ОСОБЛИВОСТІ ХВОСТО-ВИХ БАЛОК СІТЧАСТОГО ТИПУ З ПОЛІМЕРНИХ КОМПО-ЗИЦІЙНИХ МАТЕРІАЛІВ ВЕРТОЛЬОТІВ ТРАНСПОРТНОЇ КАТЕГОРІЇ

2020 ◽  
pp. 15-30
Author(s):  
А. Г. Гребеников ◽  
И. В. Малков ◽  
В. А. Урбанович ◽  
Н. И. Москаленко ◽  
Д. С. Колодийчик
Keyword(s):  
Finite Element ◽  
Strain State ◽  
Layer Structure ◽  
Metal Structure ◽  
Element Model ◽  
Stress Strain ◽  
Element Analysis ◽  
Mesh Structure ◽  
Stress Strain State ◽  
Mesh Structures

The analysis of the design and technological features of the tail boom (ТB) of a helicopter made of polymer composite materials (PCM) is carried out.Three structural and technological concepts are distinguished - semi-monocoque (reinforced metal structure), monocoque (three-layer structure) and mesh-type structure. The high weight and economic efficiency of mesh structures is shown, which allows them to be used in aerospace engineering. The physicomechanical characteristics of the network structures are estimated and their uniqueness is shown. The use of mesh structures can reduce the weight of the product by a factor of two or more.The stress-strain state (SSS) of the proposed tail boom design is determined. The analysis of methods for calculating the characteristics of the total SSS of conical mesh shells is carried out. The design of the tail boom is presented, the design diagram of the tail boom of the transport category rotorcraft is developed. A finite element model was created using the Siemens NX 7.5 system. The calculation of the stress-strain state (SSS) of the HC of the helicopter was carried out on the basis of the developed structural scheme using the Advanced Simulation module of the Siemens NX 7.5 system. The main zones of probable fatigue failure of tail booms are determined. Finite Element Analysis (FEA) provides a theoretical basis for design decisions.Shown is the effect of the type of technological process selected for the production of the tail boom on the strength of the HB structure. The stability of the characteristics of the PCM tail boom largely depends on the extent to which its design is suitable for the use of mechanized and automated production processes.A method for the manufacture of a helicopter tail boom from PCM by the automated winding method is proposed. A variant of computer modeling of the tail boom of a mesh structure made of PCM is shown.The automated winding technology can be recommended for implementation in the design of the composite tail boom of the Mi-2 and Mi-8 helicopters.

Torsional Analysis of a Steel Cord-Rubber Tire Belt Structure

1996 ◽  
Vol 24 (4) ◽  
pp. 339-348 ◽  
Author(s):  
R. M. V. Pidaparti
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Composite Structures ◽  
Three Dimensional ◽  
Element Model ◽  
Torsional Stiffness ◽  
Element Analysis ◽  
Rubber Belt ◽  
Steel Cord ◽  
Torsional Analysis

Abstract A three-dimensional (3D) beam finite element model was developed to investigate the torsional stiffness of a twisted steel-reinforced cord-rubber belt structure. The present 3D beam element takes into account the coupled extension, bending, and twisting deformations characteristic of the complex behavior of cord-rubber composite structures. The extension-twisting coupling due to the twisted nature of the cords was also considered in the finite element model. The results of torsional stiffness obtained from the finite element analysis for twisted cords and the two-ply steel cord-rubber belt structure are compared to the experimental data and other alternate solutions available in the literature. The effects of cord orientation, anisotropy, and rubber core surrounding the twisted cords on the torsional stiffness properties are presented and discussed.

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.

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