Analisis Kegagalan Boom Crane dan Pencegahannya

2014 ◽  
Vol 10 (1) ◽  
pp. 19
Author(s):  
Elvis Adril ◽  
Nasirwan - ◽  
Tri Wibowo ◽  
Julnaidi -
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Chemical Composition ◽  
Optimum Design ◽  
Root Cause ◽  
Main Equipment ◽  
Hardness Tests ◽  
Photo Documentation ◽  
Crawler Crane ◽  
Boom Crane

Sleeve (Boom) on Crawler Crane is the main equipment that serves the weight at the time of appointment (Hoisting).The problem which is founded is a fracture at the boom while lift 6 Tons of weight while the optimum design of equipment is 50 tons. The aim of this research is to found the root cause of the fracture by using photo documentation fractografi (microfractografi and macrofractografi), and hardness tests, and test the chemical composition at the surface faults boom crane. We used Finite element method (FEM) to form simulated load. The results is that the porblem accured because of error while read the load chart and error in SOP

An Optimum Design of Fiberless FMA by Finite Element Method.

1997 ◽  
Vol 63 (609) ◽  
pp. 1610-1615
Author(s):  
Koichi SUZUMORI ◽  
Toshihiro MAYEDA ◽  
Hiroshi WATANABE ◽  
Toshiaki HISADA
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Optimum Design ◽  
Element Method

scholarly journals Analysis and Disposal of Typical Breakdown Failure for Resin Impregnated Paper Bushing in the Valve Side of HVDC Converter Transformer

Energies ◽  
2019 ◽  
Vol 12 (22) ◽  
pp. 4303 ◽  
Author(s):  
Hao Tang ◽  
Guangning Wu ◽  
Ming Chen ◽  
Jiang Deng ◽  
Xining Li
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Fault Current ◽  
Special Device ◽  
Test Results ◽  
The Finite Element Method ◽  
Load Current ◽  
High Voltage Direct Current ◽  
Root Cause ◽  
Current Characteristics

This paper presents analysis, diagnosis and disposal with a typical internal breakdown failure of the resin impregnated paper (RIP) valve side bushing in high voltage direct current (HVDC) converter transformer. Based on the analysis of fault current characteristics at the time of the RIP valve side bushing failure, and field test results of insulation parameters, a method of diagnosing typical breakdown failures of valve side bushings is proposed. Through disassembly inspection of the internal overheating and arcing traces on the failure bushing, the root cause of this typical breakdown failure is found, which is upper axial flashover along the RIP condenser/SF6 interface caused by the abnormal contact of two current-carrying conductive tubes. Temperature distribution inside the bushing with an abnormal contact resistance between the copper conductive tube and aluminum conductive tube under different load current is simulated by using the finite element method. An special device is also developed for repairing defective bushing on-site, and 75 bushings with conductive contact defects have been repaired on the premise of not pushing converter transformers away from the valve hall and even without pulling out defective bushings.

scholarly journals Optimum Design of Steel Trapezoidal Box-Girders Using Finite Element Method

2018 ◽  
Vol 7 (4.20) ◽  
pp. 325 ◽  
Author(s):  
Abbas H. Mohammed ◽  
Khattab S. Abdul-Razzaq
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Optimum Design ◽  
Three Dimensional ◽  
Financial Structure ◽  
Box Girders ◽  
Component Programming ◽  
Volume Minimization ◽  
The Ideal ◽  
Element Method

The target of basic plan is to choose part sizes with the ideal proportioning of the in general auxiliary geometry. Regular steel trapezoidal box-supports have been utilized generally in different designing fields. The target of this examination is to create three-dimensional limited component display for the size improvement of steel trapezoidal box-braces. The limited component programming bundle ANSYS was utilized to decide the ideal cross segment measurement for the steel trapezoidal-box support. Two target capacities were considered in this investigation which are: minimization of the strain vitality and minimization of the volume. The plan factors are the width of the best spine, the width of the base rib, the thickness of the best rib, the thickness of the base rib, the stature of the support and the thickness of the networks. The imperatives considered in this examination are the ordinary and shear worry in steel brace and the dislodging at mid-length of the support. Improvement consequences of steel brace show that the ideal territory of cross segment for the strain vitality minimization is more noteworthy than the ideal for volume minimization by 6 %. The base cross area is the financial structure, hence the volume minimization is more pertinence for steel brace advancement.  

scholarly journals Investigations on the Performance of Grounding Device with Spike Rods (GDSR) with the Effects of Soil Resistivity and Configurations

Energies ◽  
2020 ◽  
Vol 13 (14) ◽  
pp. 3538 ◽  
Author(s):  
Abdul Wali Abdul Ali ◽  
Nurul Nadia Ahmad ◽  
Normiza Mohamad Nor ◽  
Nur Farahi Idris ◽  
Farhan Hanaffi
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Steady State ◽  
Electric Field ◽  
Optimum Design ◽  
Test Data ◽  
The Finite Element Method ◽  
Soil Resistivity ◽  
Low Resistivity ◽  
High Magnitude

In a recently published work, the characteristics of a new grounding device with spike rods (GDSR) with various arrangements of ground electrodes under high magnitude impulse currents (up to 16 kA), was investigated. In an earlier study, the ground electrodes were installed in low resistivity test media, with resistance at steady state (Rdc) values ranging from 11 Ω to 75 Ω. In practice, various soil resistivity, ranging from a few Ohm-metres to several kiloOhm-metres, have been reported in the standards. It is, therefore, necessary to investigate the characteristics of GDSR with different arrangements of ground electrodes in various soil resistivities under high impulse currents. In this present paper, six configurations of ground electrodes are used, installed at three different sites and subjected to high impulse conditions. Impulse test data of all the grounding systems are analyzed. The Finite Element Method (FEM) is used to compute the electric field values of the ground electrodes achieved. It is found that the highest electric field occurs in the presence of electrodes with the highest Rdc, soil resistivity and current magnitudes. This new data would be useful in bolstering the performance of GDSR in various types of soil resistivities, electrode arrangements and current magnitudes, which may allow for optimum design of grounding systems.

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