Global Structure Strength Analysis of SWATH Based on Direct Calculate Method

2014 ◽  
Vol 633-634 ◽  
pp. 1002-1006
Author(s):  
Chun Bo Zhen ◽  
Liang Feng ◽  
Guo Chun Lu ◽  
Yuan Hang Hou
Keyword(s):  
Stress Concentration ◽  
Boundary Conditions ◽  
Element Model ◽  
Global Structure ◽  
Strength Analysis ◽  
Response Analysis ◽  
Structure Response ◽  
Result Show ◽  
Design Loads ◽  
Structure Strength

The stress concentration of SWATH’s cross-deck structure is serious and the problem of its structure strength appears particularly important. In this paper, A 3-D global element model of SWATH was built, the design Loads, load cases and boundary conditions were studied. on the base of that, the structure response analysis was completed. The result show that the global ship’s stress is small in all load cases of head seas and oblique seas, and the bulkheads have serious stress concentration phenomenon in beam seas.The result can offer the reference for SWATH’s design and development.

Dynamic Response Analysis of Docking Chamber Structure Considering Viscoelastic Boundary Condition

2013 ◽  
Vol 405-408 ◽  
pp. 1939-1944
Author(s):  
Gui Lan Tao ◽  
Li Zhang
Keyword(s):  
Boundary Conditions ◽  
Secondary Development ◽  
Response Analysis ◽  
Elastic Model ◽  
Cross Point ◽  
Finite Element Software ◽  
Structure Response ◽  
Structure Dynamic ◽  
Fixed Boundaries ◽  
Incident Waves

Spring-damper units were set on the boundaries to absorb incident waves and reflected scattering waves to realize viscoelastic artificial boundary (VAB). The equivalent node load input method was used to simulate the VAB and viscoelastic boundary element wave input. Programming is based on APDL secondary development language with ANSYS finite element software. Considering the interaction between chamber structure and the surrounding soil, docking chamber structure dynamic model is established based on the VAB. The linear elastic model was used for concrete structure. The D-P nonlinear model was used for the back soil calculation. Docking chamber structure dynamic analysis under conditions of fixed boundaries and viscoelastic boundaries were conducted. The result indicated that under the viscoelastic boundary conditions, dynamic acceleration response is significant on the top of the lock wall, which is approximately 2.5 times of the value on the bottom of the lock wall. The maximum response stress appears near the cross point of the lock wall and the bottom floor with value of approximately 5620 kPa;.The chamber bottom floor is subjected to tension and maximum stress with the value of approximately 6180 kPa. Usually, the structure response under the fixed boundary conditions is higher than the structure response under the viscoelastic boundary conditions.

Investigation of Damping Potential of Strip Damper on a Real Turbine Blade

2016 ◽  
Author(s):  
M. Afzal ◽  
I. Lopez Arteaga ◽  
L. Kari ◽  
V. Kharyton
Keyword(s):  
Boundary Conditions ◽  
Dynamic Properties ◽  
Equations Of Motion ◽  
Iterative Solution ◽  
Element Model ◽  
Forced Response ◽  
Contact Forces ◽  
Response Analysis ◽  
Bladed Disk ◽  
Different Types

This paper investigates the damping potential of strip dampers on a real turbine bladed disk. A 3D numerical friction contact model is used to compute the contact forces by means of the Alternate Frequency Time domain method. The Jacobian matrix required during the iterative solution is computed in parallel with the contact forces, by a quasi-analytical method. A finite element model of the strip dampers, that allows for an accurate description of their dynamic properties, is included in the steady-state forced response analysis of the bladed disk. Cyclic symmetry boundary conditions and the multiharmonic balance method are applied in the formulation of the equations of motion in the frequency domain. The nonlinear forced response analysis is performed with two different types of boundary conditions on the strip: (a) free-free and (b) elastic, and their influence is analyzed. The effect of the strip mass, thickness and the excitation levels on the forced response curve is investigated in detail.

Structure Strength Analysis of Light Truck Cab Based on Tilting Mechanism

2014 ◽  
Vol 633-634 ◽  
pp. 1237-1240
Author(s):  
Fang Ding
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Element Model ◽  
Strength Analysis ◽  
Light Truck ◽  
Structure Strength ◽  
Main Components ◽  
Force Relationship ◽  
Reliable Basis

Based on the cracking phenomenon of the floor of the light truck cab, white body finite element model of a light-truck cab is established, with which computational and experimental modal calculations and analysis are conducted.Through the force relationship between tilting mechanism and the cab, the structure strength analysis of the main components of the cab is carried out, the weakness or the position of the components of the cab is found, which Provide a reliable basis for improving the structure of the tilting mechanism or the cab.

Dynamic Response Analysis of Harbor Caisson Structure Under Various Boundary Conditions

2009 ◽  
Author(s):  
Jeong-Tae Kim ◽  
So-Young Lee ◽  
Dong-Soo Hong ◽  
Jin-Hak Yi ◽  
Yoon-Koo Kang
Keyword(s):  
Boundary Conditions ◽  
Frequency Response ◽  
Experimental Tests ◽  
Element Model ◽  
Dynamic Responses ◽  
Scale Model ◽  
Small Scale ◽  
Response Analysis ◽  
Fundamental Study ◽  
Various Boundary Conditions

In this study, vibration responses of harbor caisson structures with various boundary conditions are experimentally examined as a fundamental study to develop a health assessment technique for harbor structures. To achieve the objective, four-step approach is implemented. Firstly, a target caisson structure is selected and a small-scale model of the caisson model is constructed in the laboratory. Secondly, a finite element model of the caisson model is generated to analyze dynamic responses of the structure. Thirdly, experimental tests are performed on the caisson model to obtain dynamic responses under various boundary conditions and impact locations. Four different boundary conditions, 1) ‘hanging by crane’, 2) ‘standing on styrofoam block’, 3) ‘standing on sand mat’, and 4) ‘standing on concrete floor’ are considered. Finally, variation of frequency response ratio assurance criterion and correlation coefficients of frequency response functions are analyzed.

Structure Strength Analysis for Fork Joint of the Universal Coupling Based on FEM

2014 ◽  
Vol 945-949 ◽  
pp. 696-699
Author(s):  
Yuen Xing ◽  
Peng Fei Yao
Keyword(s):  
Stress Concentration ◽  
Working Conditions ◽  
Strength Analysis ◽  
Analytical Results ◽  
Joint Fracture ◽  
Structure Strength ◽  
Normal Production ◽  
Universal Coupling

Fork joint fracture of mill universal coupling directly affect the normal production, Using FEM software ANSYS analyzed the structure strength of fork joint of universal coupling. The results indicated the Stress concentration of the fork joint under the most dangerous working conditions. The analytical results accorded with actual status in a certain extent. The modified design prevents the joint fracture.

Design of a Flexible-Base Hinged Connector for Very Large Floating Structures

2018 ◽  
Author(s):  
Qijia Shi ◽  
Daolin Xu ◽  
Haicheng Zhang
Keyword(s):  
Dynamic Behavior ◽  
Element Model ◽  
Structure Design ◽  
Deformation Analysis ◽  
Strength Analysis ◽  
Floating Platform ◽  
Floating Structures ◽  
Design Loads ◽  
Flexible Base ◽  
Optimal Stiffness

Connector of multi-modular VLFS is a key component which determines the connection load and the dynamic behavior of the system. This paper presents a new design of the flexible-base hinged connector (FBHC) for VLFS in order to reduce the connection load. The connector consists of a hinged joint and two flexible bases. A finite element model of the connector is established for the deformation analysis to match up the requirement on the optimal stiffness combination of the connector [1]. Further the strength analysis is also carried out to check the safety of the structure design according to the maximum design loads. By applying the connector model to a three-modular floating platform, the dynamic behavior of the platform is analyzed. The results show that the responses of the modules are within the tolerable range and the connector meets the strength requirements.

The Research on Shell Strength and Pressurize Reliability of Underwater Vehicle Mating Device

2013 ◽  
Vol 572 ◽  
pp. 197-200
Author(s):  
Zhong Lin Zhang ◽  
Li Quan Wang
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Deep Ocean ◽  
Element Model ◽  
Underwater Vehicle ◽  
Important Condition ◽  
Result Show ◽  
Structure Strength

Underwater vehicle has abroad applications in submarine rescue and deep-ocean workstation and so on. Moreover, mating device strength and skirt mouth pressurize is important condition for working safe. In order to realize reliable mating, endure force analyzing on steady mating to platform was put up and load to finite element model. The computing result of finite element model and experimental value is accordant. The research and experiment on pressurize methods was finished, the result show that O-type pressurize and lip-type pressurize has ensured pressurize reliability. This paper can provide reference for analogy structure Strength and pressurize reliability.

Seismic Response Analysis of Fuyang River Aqueduct

2014 ◽  
Vol 912-914 ◽  
pp. 1739-1742
Author(s):  
Cai Ying Chen ◽  
Ke Lun Wei ◽  
Gui Qiang Yang
Keyword(s):  
Finite Element ◽  
Boundary Conditions ◽  
Seismic Response ◽  
Elastic Recovery ◽  
Element Model ◽  
Response Analysis ◽  
Actual Situation ◽  
Seismic Response Analysis ◽  
Finite Element Software ◽  
Recovery Performance

In this paper, using finite element software ANSYSanalyzes seismic respons of Fuyang river aqueduct, respectively establishfinite element model under viscoelastic boundary conditions and elasticboundary conditions, compare and analyze seismic respons of aqueduct structureunder two kinds of boundary conditions. The results show that, compared withelastic boundary conditions, viscoelastic boundary conditions not only cansimulate elastic recovery performance of foundation, but also can realizeinfinite medium radiation damping, and viscoelastic boundary conditions is moreclose to the actual situation.

scholarly journals Thermal-strength analysis of a cross-flow heat exchanger and its design improvement

2021 ◽  
Vol 11 (1) ◽  
pp. 1069-1075
Author(s):  
Mariusz Konieczny ◽  
Łukasz Felkowski
Keyword(s):  
Finite Element ◽  
Heat Exchanger ◽  
Stress Concentration ◽  
Three Dimensional ◽  
Cross Flow ◽  
Element Model ◽  
Strength Analysis ◽  
Three Dimensional Model ◽  
Element Analysis ◽  
Flow Heat

Abstract After a year of the heat exchanger operation in overload conditions, a number of cracks on the tube connections to the tubesheet have been observed. To explain the stress concentration and crack initiation, a finite element analysis is performed. A three-dimensional model is constructed and analyzed. To calculate more precisely the state of stress in the most loaded regions, a submodel is created. The maximum stress exceeds the allowable stress, and according to the standards, it can lead to ratcheting. To reduce stress concentration, all tubes should be shortened and corrugated tubes are installed in the high-temperature region from the side of the burner. A finite element model of the modified heat exchanger and a submodel are created. In the modified heat exchanger, ratcheting should not occur according to the applied standards. During the operation of the modified heat exchanger, there are no further problems with cracking.

Design and Structure Strength Analysis of Double-Deck Prestressed Sectional Female Die

2013 ◽  
Vol 706-708 ◽  
pp. 1262-1265
Author(s):  
Qing Qing Lv ◽  
Li Quan Yang ◽  
Lei Zhao
Keyword(s):  
Theoretical Calculations ◽  
Element Model ◽  
Cold Extrusion ◽  
Strength Analysis ◽  
Process Technology ◽  
Work Process ◽  
Forming Process ◽  
Structure Strength ◽  
The Finite Element Model ◽  
Ansys Workbench

Monolithic die often early failure due to tangential cracking in the production process of the bush by cold extrusion; Derived through theoretical calculations based on the study of the bush forming process technology, a reasonable interference quantity, contact stress, designed to double-deck prestressed sectional female die, established a reasonable boundary conditions of the finite element model; using ANSYS Workbench as a platform, the work process of the double-deck prestressed sectional female die are studied by numerical simulation, preliminary forecast of the distribution of the stress field of the sectional female die in no-load and work process, compared to the working strength of the original monolithic die, verified the superiority of prestressed sectional female die, provided a valuable reference for the actual production.

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