scholarly journals Modal analysis of support structure of cylindrical container

2020 ◽  
Vol 310 ◽  
pp. 00032
Author(s):  
Lubomir Prekop
Keyword(s):  
Boundary Conditions ◽  
Dynamic Analysis ◽  
Modal Analysis ◽  
Support System ◽  
Seismic Analysis ◽  
Road Maintenance ◽  
Cylindrical Container ◽  
Support Structure ◽  
Internal Forces ◽  
Winter Road

The paper deals with dynamic analysis of a container. The analyzed structure consists of a steel support structure and a cylindrical container. The container is used for storage of road salt and other spreading materials during winter road maintenance. Three variants of support system of a structure have been analyzed. These have been introduced into the model as different boundary conditions. The modal analysis was performed, whose results are eigenfrequencies and eigenshapes of the structure. In the final part, the results obtained from the seismic analysis of the structure (displacements and internal forces) have been presented.

scholarly journals Spectral analysis of the support structure of the cylindrical container

2020 ◽  
Vol 313 ◽  
pp. 00005
Author(s):  
Lubomir Prekop ◽  
Alzbeta Grmanova
Keyword(s):  
Spectral Analysis ◽  
Boundary Conditions ◽  
Support System ◽  
Seismic Analysis ◽  
Response Spectra ◽  
Road Maintenance ◽  
Cylindrical Container ◽  
Support Structure ◽  
Internal Forces ◽  
Winter Road

The paper deals with dynamic analysis of a container. The analyzed structure consists of a steel support structure and a cylindrical container. The container is used for storage of road salt and other spreading materials during winter road maintenance. Three variants of support system of a structure have been analyzed. These have been introduced into the model as different boundary conditions. The spectral analysis was performed in which the response spectra taken from the Eurocode were used. In the final part, the results obtained from the seismic analysis of the structure (displacements and internal forces) have been presented.

Analysis of Reliability Degree for Primary Support System in Tunnel

2012 ◽  
Vol 204-208 ◽  
pp. 1538-1541
Author(s):  
Zhong Ming Su
Keyword(s):  
Safety Factor ◽  
Support System ◽  
Geometrical Dimension ◽  
Series System ◽  
Support Structure ◽  
Performance Function ◽  
Material Parameters ◽  
Internal Forces ◽  
Primary Support

Structure performance function is established with the consideration of safety factor, taking the primary support structure as a series system and determining the invalidation model of the system, and then the internal forces of primary support are expressed by the limit displacement. The calculating analysis also takes material parameters and geometrical dimension into consideration. Based on a typical tunnel, the reliability degree of the whole system is calculated, which indicates that the reliability degree is rather smaller at a certain section of the primary support, but it can satisfy design requires of the whole system, and the tunnel stays in a safety state.

The Aluminium and the Steel Supporting System for the Horns Assembly in the High Intensity Neutrino Oscillation Project

2013 ◽  
Vol 542 ◽  
pp. 205-217
Author(s):  
Bogdan Szybiński
Keyword(s):  
Dynamic Analysis ◽  
Neutrino Oscillation ◽  
Support System ◽  
High Intensity ◽  
Optimal Parameters ◽  
Support Structure ◽  
Static Loads ◽  
Final Shape ◽  
Supporting System ◽  
Materials Used

A new project to analyse neutrino features is under development within the frame of the High Intensity Neutrino Oscillation EURONu project [. The final shape of the magnetic horns supporting system is proposed. This system is designed for four horns joined in one assembly. For the support structure a search for the optimal parameters is made with respect to the static loads. After that dynamic analysis is performed, this is used, if necessary, for the final tuning of the designing parameters. The above approach is investigated for two different materials used for the support system.

scholarly journals Seismic Analysis of Electrical Panel

2019 ◽  
Vol 8 (4) ◽  
pp. 3416-3420
Keyword(s):  
Dynamic Analysis ◽  
Modal Analysis ◽  
Nuclear Power ◽  
Power Plants ◽  
Seismic Analysis ◽  
Response Spectrum ◽  
Response Spectra ◽  
Assembly Structure ◽  
Modeling Software ◽  
Project Data

Equipments used at nuclear power plants require robust and reliable designs because in case of disaster, such as earthquake, small damage can turn into an unpredictable result. The analysis has been done using Finite Element Method (FEM), a common tool used for the analysis of structures. To conduct seismic analysis, it is necessary to perform modal analysis and calculate response spectrum from the Floor Response Spectrum. In the present project, data is obtained from the modal analysis using ANSYS software for panel assembly structure model. The Floor Response Spectrum (FRS) data for the geographical region where this structure will be mounted is collected. The collected data is given as input to response spectrum analysis where it subjected to these conditions. The output of this analysis determines whether the structure that has been designed is within the safety limit or not. In the present project a 3d model of the Electronic panel assembly structure is modeled using UNIGRAPHICS modeling software. The model is converted to parasolid and imported into Ansys. As a first step modal analysis has been performed to predict the fundamental frequency of the structure. Later dynamic analysis has been performed to evaluate the seismic response of the system under Operation Basis Earthquake (OBE). The response spectra used for OBE in X, Y, Z directions are given as input. The dynamic analysis has been performed to determine the stresses developed in the beam and results obtained have been compared to ASME standards. Based on the results obtained design optimization of the structure has been carried out.

Optimal Method for Determination of Rayleigh Damping Co-efficients for Different Materials using Modal Analysis

2021 ◽  
Vol 13 (1) ◽  
Author(s):  
B. Rahul ◽  
J. Dharani ◽  
R. Balaji
Keyword(s):  
Boundary Conditions ◽  
Dynamic Analysis ◽  
Modal Analysis ◽  
Degrees Of Freedom ◽  
Damping Ratio ◽  
Optimal Method ◽  
Multiple Degrees Of Freedom ◽  
Rayleigh Damping ◽  
Damping Matrix

Rayleigh damping co-efficients are the essential parameters to determine the damping matrix of a system in dynamic analysis. For the systems with multiple degrees of freedom, it is difficult to arrive for suitable Rayleigh damping co-efficients. This paper represents a simple and effective method for the determination of Rayleigh co-efficients α and β for the system with multiple degrees of freedom. An unrealistic constant damping ratio for all modes is assumed to get rational value of α and β, which leads the determination of progressively varying damping ratio for all modes. By comparing the damping ratio arrived from assumed α and β with assumed unrealistic damping ratio, the suitable and most precise values are determined. This method is implemented for different materials with different boundary conditions by considering different significant modes and the effect of above parameters on α and β values are also discussed.

An efficient method for seismic analysis of structures

2015 ◽  
Vol 32 (6) ◽  
pp. 1708-1721 ◽  
Author(s):  
A. Kaveh ◽  
H. Rahami ◽  
Iman Shojaei
Keyword(s):  
Finite Difference ◽  
Dynamic Analysis ◽  
Modal Analysis ◽  
Efficient Method ◽  
Seismic Analysis ◽  
Boundary Value ◽  
Efficient Solutions ◽  
Matrix Inversion ◽  
Graph Products ◽  
Content Type

Purpose – The purpose of this paper is to present an efficient method for dynamic analysis of structures utilizing a modal analysis with the main purpose of decreasing the computational complexity of the problem. In traditional methods, the solution of initial-value problems (IVPs) using numerical methods like finite difference method leads to step by step and time-consuming recursive solutions. Design/methodology/approach – The present method is based on converting the IVP into boundary-value problems (BVPs) and utilizing the features of the latter problems in efficient solution of the former ones. Finite difference formulation of BVPs leads to matrices with repetitive tri-diagonal and block tri-diagonal patterns wherein the eigensolution and matrix inversion are obtained using graph products rules. To get advantage of these efficient solutions for IVPs like the dynamic analysis of single DOF systems, IVPs are converted to boundary-value ones using mathematical manipulations. The obtained formulation is then generalized to the multi DOF systems by utilizing modal analysis. Findings – Applying the method to the modal analysis leads to a simple and efficient formulation. The laborious matrix inversion and eigensolution operations, of computational complexities of O(n2.373) and O(n3), respectively, are converted to a closed-form formulation with summation operations. Research limitations/implications – No limitation. Practical implications – Swift analysis has become possible. Originality/value – Suitability of solving IVPs and modal analysis using conversion and graph product rules is presented and applied to efficient seismic optimal analysis and preliminary design.

Modeling the Snow Deposit Process on the Highways in the Flowvision Software

2020 ◽  
pp. 72-83
Author(s):  
Т. В. Самодурова ◽  
О. В. Гладышева ◽  
Н. Ю. Алимова ◽  
Е. А. Бончева
Keyword(s):  
Hydrodynamic Model ◽  
Geometric Model ◽  
Information Resources ◽  
Road Maintenance ◽  
Snow Removal ◽  
Experimental Section ◽  
Deposit Modeling ◽  
Winter Road ◽  
Highway Embankment ◽  
Winter Road Maintenance

Постановка задачи. Рассмотрена задача моделирования отложения снега во время метелей на автомагистралях с барьерными ограждениями в программе FlowVision . Результаты. В качестве опытного участка рассмотрен участок автомагистрали, проходящий в насыпи. Создана геометрическая модель участка автомагистрали. Обоснованы информационные ресурсы для создания гидродинамической модели обтекания насыпи автомагистрали с барьерными ограждениями снеговетровым потоком во время метелей. Проведено моделирование процесса снегонакопления на опытном участке с использованием программного комплекса FlowVision во время метелей с различными параметрами. Выводы. Сделан вывод о возможности применения программного комплекса FlowVision для совершенствования методики назначения снегозащитных устройств и определения параметров снегоочистки при зимнем содержании автомобильных дорог. Statement of the problem. The problems of snow deposit modeling on the highways with crash barriers during blizzards in the FlowVision was discussed. Results. The highway section passing in the embankment as an experimental section has been considered. The geometric model of the highway section was created. The information resources for designing a hydrodynamic model of a snowflow stream of highway embankment with barriers during blizzard were identified. The modeling of the snow deposit process in the experimental section using the FlowVision software during blizzards with different parameters was carried out. Conclusions. It was concluded that it is possible to use the FlowVision software to improve the methodology for snow protection designing and determining snow removal parameters for winter road maintenance.

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