The Impact of Seawater Corrosion on Friction Force of Cylindrical Deputy Campaign Latch

2012 ◽  
Vol 531 ◽  
pp. 597-600
Author(s):  
Cheng Zhao ◽  
Kun Luo
Keyword(s):  
Finite Element ◽  
Stress State ◽  
Friction Force ◽  
Similarity Theory ◽  
Research Subject ◽  
Seawater Corrosion ◽  
Load Calculation ◽  
Before And After ◽  
The Impact

According to the stress state and importance of cylindrical deputy campaign latch, NO. 2 cylindrical deputy campaign latch was selected as research subject. The work including design , processing, finite element load calculation, friction force before and after corrosion of similarity samples were carried out according to similarity theory. Friction force calculations of cylindrical deputy campaign latch before and after corrosion were 1206N and 1222N respectively. Compared with the friction force before corrosion, the friction force of cylindrical deputy campaign latch was increased by 19.1% because of seawater corrosion.

The Impact of Seawater Corrosion on Friction Torque of Bearing Deputy Campaign

2011 ◽  
Vol 121-126 ◽  
pp. 2965-2968
Author(s):  
Cheng Zhao ◽  
Kun Luo ◽  
Chang Yin Gao
Keyword(s):  
Finite Element ◽  
Corrosion Resistance ◽  
Stress State ◽  
Similarity Theory ◽  
Friction Torque ◽  
Seawater Corrosion ◽  
Load Calculation ◽  
Before And After ◽  
The Impact

According to the stress state and corrosion resistance of bearing deputy campaigns,NO.5 bearing deputy campaign was selected as research subject.The work including design, processing, finite element load calculation, friction torque before and after corrosion of bearing deputy campaign samples were carried out according to similarity theory. Friction torque calculations of bearing deputy campaign before and after corrosion were 2.9×106N•mm and 3.2×106N•mm respectively. Compared with the friction torque before corrosion,the friction torque of bearing deputy campaign was increased by 10.4% because of seawater corrosion.

Explicit Finite Element Study of Liquid Sloshing Behavior in Fluid-Structure Interaction Condition

2017 ◽  
Author(s):  
Shuo Yang ◽  
Raymond K. Yee
Keyword(s):  
Finite Element ◽  
Water Level ◽  
Similarity Theory ◽  
Fluid Structure Interaction ◽  
Water Levels ◽  
Tank Wall ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Sloshing Phenomenon ◽  
The Impact

As a common phenomenon in liquid motions, sloshing usually happens in a partially filled liquid tank of moving vehicle or structure. The objectives of this paper are to study sloshing behavior in rigid tank and deformable tank, and to develop a better performance baffle design in the tank under seismic excitations. The tank is surged with a sinusoidal oscillation about horizontal x-direction. The hydro-elasticity effect of sloshing pressure on the tank wall was taken into consideration due to the fluid-structure interaction between impact pressures and tank structures. ABAQUS finite element program using Coupled Eulerian-Lagrangian (CEL) technique was employed to simulate fluid sloshing. The sloshing phenomenon was studied in rigid tank and deformable tank models with three different water levels, and the effect of wall thickness of the deformable tank on sloshing behavior was discussed. One way to minimize the effect of sloshing in a tank, baffles are used and installed in the middle of the tank, and then various heights and material types of baffle were evaluated. The simulation results show that higher water level case creates greater pressure impact on the tank wall than lower water level case, and the elasticity of the tank structure would reduce the impact pressure of the wall. For the simulation tank model with size of 1m (H) × 1m (W) × 0.2m (D), better performance baffle was found to be the one with the height of 0.35m and was made of acrylic material. Moreover, the conclusion of this study can be extrapolated to other dimensions of the model based on similarity theory. This paper also can serve as an aid in further studying sloshing phenomenon. The findings of this study can be applied to restrain or minimize sloshing motions inside a tank.

Analyze the Impact of the Thin-Walled Hollow Pier by Construction of Reservoir

2013 ◽  
Vol 438-439 ◽  
pp. 1262-1264
Author(s):  
Ke Dong Tang ◽  
Feng Gui Jin
Keyword(s):  
Finite Element ◽  
Realistic Model ◽  
Finite Element Software ◽  
Before And After ◽  
Reservoir Construction ◽  
Thin Walled ◽  
The Impact

The river dam intends to build at 280m downstream of a built bridge. This paper, using ANSYS finite element software, establishes a rational and realistic model to analyze the influence of the reservoir construction on the thin-walled hollow pier of built bridge. The variation of the stress of the bridge thin-walled hollow pier before and after impounding of the reservoir is given out, which can be as a guidance for future reinforcing the thin-walled hollow pier.

Analysis the Cable Replacement Method of Tianjin Yonghe Bridge

2011 ◽  
Vol 71-78 ◽  
pp. 1383-1387 ◽  
Author(s):  
Wen Juan Yao ◽  
Wu Yang ◽  
Xiao Yu Liu
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Stress State ◽  
Main Beam ◽  
The Finite Element Method ◽  
Replacement Method ◽  
Replacement Process ◽  
Before And After ◽  
Element Method

Taking Tianjin Yonghe bridge for example, the finite element method is adopted to simulate each stages of cable replacement process, the dates of tension, the alignment of main beam and the change of stress before and after cable replacement are compared and analysed, The measured value is greatly consistent with calculated value, Stress state of the bridge has been greatly improved, the weight of main beam bearing by the cable will be shared by a few closed cable after unloading, so the cables which are more serious corroded should be replaced.

Forced Response of PZT Glide Heads1

2000 ◽  
Vol 122 (4) ◽  
pp. 780-786 ◽  
Author(s):  
Jin-Hui Ou-Yang ◽  
Alex Y. Tsay ◽  
I. Y. Shen ◽  
C.-P. Roger Ku ◽  
David Kuo
Keyword(s):  
Finite Element ◽  
Impact Force ◽  
Laser Doppler Vibrometer ◽  
Forced Response ◽  
Finite Element Analyses ◽  
Pass Filter ◽  
Electric Circuits ◽  
Resonance Frequencies ◽  
Before And After ◽  
The Impact

This paper studies forced response of PZT glide heads through calibrated experiments and finite element analyses. The PZT glide heads consist of an Al2O3TiC slider and a PZT transducer. In the first part of the research, the PZT transducer serves as an actuator exciting the glide heads from 100 kHz to 1.3 MHz. A laser Doppler vibrometer (LDV) and an impedance analyzer are used to measure frequency response functions (FRF) and PZT impedance. In addition, the response of the PZT glide heads is simulated through finite element analyses (FEA). The FEA predict the resonance frequencies with less than 5 percent difference. For the first two slider modes, the FEA also predict resonance amplitudes with good accuracy. In the second part of the research, the PZT transducer serves as a sensor, and the glide head is subjected to an impact force. To produce short impacts experimentally, miniature balls are dropped to the glide heads. The impact force is estimated through the impact duration and the momentum change before and after the impact. Then the impact force and the PZT output voltage are processed to produce FRF. Since the PZT sensor and its circuit form a high-pass filter, the FEA need to consider the slider, the PZT transducer, and the electric circuits simultaneously to produce meaningful results. The FEA predictions agree with the experimental measurements for the first two slider modes as well. [S0742-4787(00)01004-3]

Numerical Simulation Analysis of Beam-Reduction and Rib-Addition Strengthening Method of Hollow Slab Bridges

2012 ◽  
Vol 546-547 ◽  
pp. 57-65
Author(s):  
Guang Ning Pu ◽  
Li Jun Li ◽  
Yu Zhao
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Stress State ◽  
Simulation Analysis ◽  
Obvious Effect ◽  
Finite Element Software ◽  
Beam Method ◽  
Before And After ◽  
The Difference ◽  
Strengthening Method

For the purpose of the study of the mechanical mechanism of beam-reduction and rib-addition strengthening method as well as the difference between hinged beam method and rigidly connected beam method, finite element models are established for hollow slab bridge before and after strengthening respectively with the finite element software Ansys. The stress distributions on hollow slab bridge before and after strengthening are compared through numerical simulation analysis. The improvement effects of beam-reduction and rib-addition method on the transverse connection and stress state of hollow slab bridge are analyzed at the same time. It is proved that this strengthening method is of obvious effect and the bearing capacity of the existing bridge can be greatly enhanced. Meanwhile, the result of numerical simulation analysis shows that the beam-reduction and rib-addition hinged beam method and rigidly connected beam method have the similar effects. Both of them result in much improvement of transverse distribution and enhancement of transverse connection. But the rigidly connected beam method has a better overall rigidity and a tighter transverse connection. Its improvement effect on the stress state of the old beam slab is superior to that of the hinged beam method.

scholarly journals Bracket Structure Stress Analysis of Rotating Construction Cable-stayed Bridge of Thousands of Tons

2014 ◽  
Vol 8 (1) ◽  
pp. 476-481
Author(s):  
Lifeng Wang ◽  
Erqiang Wang ◽  
Dongpo He
Keyword(s):  
Finite Element ◽  
Stress State ◽  
Stress Analysis ◽  
Dynamic Simulation ◽  
Traction Force ◽  
Finite Element Software ◽  
Cable Stayed Bridge ◽  
The Common ◽  
Pressure Stress ◽  
The Impact

Based on the rotating construction cable-stayed bridge of thousands of tons, dynamic simulation of bracket structure in rotating construction was analyzed with ANSYS finite element software. The result shows that with the common influence of gravity, traction and prestress, the overall bracket structure presents compressive stress mainly of stress state. Traction force of the impact is not big, considering alone effect of traction, the whole stress level of bracket structure is very low. Under the effect of prestress, bracket structure presents a huge pressure stress in horizontal direction to prevent accidental tilt in the rotating process, and parts of the steel bundle should be removed after the rotation.

Impact of Particles on Ductile Substrate

2005 ◽  
Author(s):  
Wing Cheng ◽  
Shigeru Itoh
Keyword(s):  
Finite Element ◽  
Stress State ◽  
Wear Behavior ◽  
Erosion Wear ◽  
Fatigue Wear ◽  
Hard Particles ◽  
Nonlinear Transient ◽  
Ductile Substrate ◽  
Impact Angles ◽  
The Impact

The purpose of this research is to obtain a better understanding of the stress state in ductile substrate due to impact of hard particles. Impact dynamic finite element analyses were performed using a nonlinear transient finite element code. In this phase of the research, only rounded particle is considered. Other considerations include impact angles and velocities. Resulting stress state at various locations of the impact region was studied. Results provide insights into the mechanisms for erosion wear and are used to explain erosion wear behavior in ductile substrate. A wear relation was developed to include the fatigue wear mechanism.

Strategic Role of Zakat in Multidimensional Quality of Life in Sijunjung, Indonesia

2018 ◽  
Vol 15 (1) ◽  
pp. 55-72
Author(s):  
Herlin Hamimi ◽  
Abdul Ghafar Ismail ◽  
Muhammad Hasbi Zaenal
Keyword(s):  
Quality Of Life ◽  
Positive Impact ◽  
Wealth Distribution ◽  
Absolute Poverty ◽  
Before And After ◽  
The Status ◽  
Being There ◽  
The Impact

Zakat is one of the five pillars of Islam which has a function of faith, social and economic functions. Muslims who can pay zakat are required to give at least 2.5 per cent of their wealth. The problem of poverty prevalent in disadvantaged regions because of the difficulty of access to information and communication led to a gap that is so high in wealth and resources. The instrument of zakat provides a paradigm in the achievement of equitable wealth distribution and healthy circulation. Zakat potentially offers a better life and improves the quality of human being. There is a human quality improvement not only in economic terms but also in spiritual terms such as improving religiousity. This study aims to examine the role of zakat to alleviate humanitarian issues in disadvantaged regions such as Sijunjung, one of zakat beneficiaries and impoverished areas in Indonesia. The researcher attempted a Cibest method to capture the impact of zakat beneficiaries before and after becoming a member of Zakat Community Development (ZCD) Program in material and spiritual value. The overall analysis shows that zakat has a positive impact on disadvantaged regions development and enhance the quality of life of the community. There is an improvement in the average of mustahik household incomes after becoming a member of ZCD Program. Cibest model demonstrates that material, spiritual, and absolute poverty index decreased by 10, 5, and 6 per cent. Meanwhile, the welfare index is increased by 21 per cent. These findings have significant implications for developing the quality of life in disadvantaged regions in Sijunjung. Therefore, zakat is one of the instruments to change the status of disadvantaged areas to be equivalent to other areas.

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