scholarly journals Design of natural-rubber panel railroad crossing using finite element method

2018 ◽  
Vol 192 ◽  
pp. 02056
Author(s):  
Aunna Sukhom ◽  
Ittipol Jangchud ◽  
Monsak Pimsarn ◽  
Jarruwat Charoensuk ◽  
Veerachai Treeporncharoen
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Natural Rubber ◽  
Safety Factor ◽  
Equivalent Strain ◽  
Applied Loading ◽  
Railroad Crossings ◽  
Railway System ◽  
State Railway ◽  
Element Method

Thailand has a railway system that is available throughout the country, so there are several railroad crossings. These crossings are generally made of concrete or logs with multiple constraints. There are some disadvantages of concrete railroad crossing, such as, crack, noise during car passing over. To overcome these disadvantages, the softer materials should be used instead. Therefore, this research proposes the natural rubber, widely grown throughout Thailand, panel railroad crossing. However, the natural rubber alone is not enough to withstand the harsh condition. Thus, it is necessary to have some addition ingredients that will enhance the natural rubber properties. The material used in this research is a rubber compound between Chloroprene Rubber (CR) 75% and Natural rubber (NR) 25% blend with additives such as carbon black (CB), magnesium oxide (MgO) and sulfur (S8). The objectives of this article were to analyze the deformation of the natural rubber panel railroad crossing and to evaluate its safety factor, defined as the ratio of strain at break and the maximum equivalent strain, using finite element method. In the analysis, the applied loading of the model was obtained from the State Railway of Thailand. The analyzed results reveal that the deflection of rubber panels passes the standard from State Railway of Thailand. Safety factor of external rubber panel is 27.03 and for internal rubber panels are 9.12 and 15.29. The metal pads had elastically deformed and concrete railroad sleeper deformation was very small.

scholarly journals The Application Research of Inverse Finite Element Method for Frame Deformation Estimation

2017 ◽  
Vol 2017 ◽  
pp. 1-8 ◽  
Author(s):  
Yong Zhao ◽  
Hong Bao ◽  
Xuechao Duan ◽  
Hongmei Fang
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Optical Measurement ◽  
Estimation Algorithm ◽  
Mode Shapes ◽  
Real Time Control ◽  
Applied Loading ◽  
Percentage Difference ◽  
Inverse Finite Element Method ◽  
Element Method

A frame deformation estimation algorithm is investigated for the purpose of real-time control and health monitoring of flexible lightweight aerospace structures. The inverse finite element method (iFEM) for beam deformation estimation was recently proposed by Gherlone and his collaborators. The methodology uses a least squares principle involving section strains of Timoshenko theory for stretching, torsion, bending, and transverse shearing. The proposed methodology is based on stain-displacement relations only, without invoking force equilibrium. Thus, the displacement fields can be reconstructed without the knowledge of structural mode shapes, material properties, and applied loading. In this paper, the number of the locations where the section strains are evaluated in the iFEM is discussed firstly, and the algorithm is subsequently investigated through a simple supplied beam and an experimental aluminum wing-like frame model in the loading case of end-node force. The estimation results from the iFEM are compared with reference displacements from optical measurement and computational analysis, and the accuracy of the algorithm estimation is quantified by the root-mean-square error and percentage difference error.

An Extended Model of Light Railway System Used in Analysis of Normal Operation and Fault Conditions

2014 ◽  
Author(s):  
Sorin Deleanu ◽  
Keith Forman ◽  
David C. Carpenter ◽  
Calin Munteanu
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Short Circuit ◽  
Operating Conditions ◽  
Normal Operation ◽  
Dc Power ◽  
Railway System ◽  
Analytical Approaches ◽  
Element Method

The paper provides a description of the analysis of a Light Railway System for two configurations: - Rails above the ground and catenary supply - Track in a tunnel and power rail supply. Finite Element Method (FEM) analysis is compared to classical analytical approaches by Carson, Pollaczek, Bickford and Tylavsky. Reviews of methods to determine self and mutual impedance for electrified railroads are provided. The solution of finite element method (FEM) applied for the determination of impedance for the two traction rail and catenary configuration, modeled and examined, consists of computational analysis based upon minimizing the energy of electromagnetic field. The analytic impedance models are built on Carson-Pollaczek–Bickford equations, adjusted by Tylavsky, for two situations: when the ground is perfectly insulated and when considering the earth return current. The railway track – catenary is integrated in a system containing the model for traction substation(s) with DC power output and moving vehicle with induction motors, controlled using voltage inverters with pulse width modulation. The light transit train, supplied with a rectified DC power, is subjected to a significant harmonic content, which may affect the signal and control circuits. It is then shown that the power and signaling characteristics of the modelled system can predict the magnitude of the perturbation current for different frequencies, in normal operating conditions and in presence of faults as well. In many of the light transportation systems, from all types of faults, the DC short-circuit at the output of the power rectifiers used for energizing the power rail and/or catenary presents a special interest. This is because of two main reasons: the positions of the vehicle-loads are in continuous changing and, even if they operate from DC sources, the parent network is still of AC type. A key issue was the determination of the distributed parameters (resistances, inductances) of the running track and catenary, from experimental data and preliminary analytical and numerical calculations, followed by the analysis of their dependencies with the current magnitude and frequency response. A specific short-circuit study case is simulated when using a model of the traction system for the purpose of the DC fault current prediction. The paper concludes with a discussion of future developments and further work.

Stability Analysis for Coupling Hydraulic-Mechanical Unsaturated Deposit Body under Rainfall Infiltration

2013 ◽  
Vol 838-841 ◽  
pp. 768-772
Author(s):  
Qiang Ren
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Safety Factor ◽  
Unsaturated Flow ◽  
Flow Behavior ◽  
Flow Theory ◽  
Rainfall Infiltration ◽  
Strongly Coupled ◽  
The Difference ◽  
Element Method

In view of the deficiency of traditional saturated soil theory analyzing seepage and stability of slope under rainfall infiltration, based on the saturated-unsaturated flow theory, considering the mechanical behavior of slope which strongly coupled with flow behavior, the hydraulic-mechanical coupled finite element method on the case of rainfall induced instability in deposit body in Front of gushui Dam are used. The safety factor is calculated based on stress field obtained from the finite element method, with modified unsaturated Mohr-Coulomb failure criterion. The influences of rainfall duration and rainfall intensity to stability of deposit body are analyzed; the difference between calculated safety factor based on unsaturated flow theory and saturated flow theory is discussed.

scholarly journals Rancangan Geometri Rencana Lereng Akhir Waste Dump terhadap Displacment Batuan Dasar Area Waste Dump PT X Kecamatan Palimanan, Kabupaten Cirebon, Provinsi Jawa Barat

2021 ◽  
Vol 1 (1) ◽  
pp. 22-29
Author(s):  
Rana Antariksa D ◽  
Yuliadi ◽  
Zaenal
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Slope Stability ◽  
Safety Factor ◽  
Open Pit ◽  
Open Pit Mining ◽  
Waste Dump ◽  
Value Analysis ◽  
Total Displacement ◽  
Element Method

Abstract. PT X is a company engaged in the cement factory industry in West Java that uses an open-pit mining system with limestone mining. X is planning the location of waste dump placement using the in-pit dump method, so a safe and efficient final slope design is needed. For optimal stockpiling activities, slope geometry planning on the waste material dump needs to be carried out slope stability analysis. Slope stability is influenced by slope height, slope angle, rock mass strength, rock type, and groundwater level. The purpose of this research is to find out whether or not a slope is stably displayed in the Safety Factor (FK) value. Analysis process is carried out using the Finite Element Method and the Boundary Equilibrium Method. The analysis was carried out on bedrock and pile material. Analysis of bedrock using Finite Element Method in the Goa area in Sections A - B and C - D obtained SRF values ​​of 4.6 and 16 with a total displacement of 13,771 m and 6 m. In the area of ​​Mount Bindis Section E - F and G - H obtained SRF values ​​of 2.5 and 4.75 with a total displacement of 11.8 m and 3 m. Analysis of the embankment material in the Goa In areas with Sections A - B and C - D FK values ​​obtained = 2.11 and 1.56 and for Section C - D FK 2.62 and 1.94. In the Mount Bindis Area with sections E - F and G - H FK values ​​= 1.59 and for Section G - H FK values ​​= 2.31 and 1.57. The disposal obtained the amount of volume that will be accommodated in each area of ​​11,175,191.19 LCM and 74,749,919.45 LCM. Abstrak. PT X adalah perusahaan yang bergerak di industri pabrik semen di Jawa Barat yang menggunakan sistem penambangan terbuka dengan penambangan batu kapur. X sedang merencanakan lokasi penempatan pembuangan limbah dengan menggunakan metode pembuangan di dalam pit, sehingga diperlukan desain lereng akhir yang aman dan efisien. Untuk kegiatan penimbunan yang optimal, perencanaan geometri lereng pada tempat pembuangan bahan limbah perlu dilakukan analisis stabilitas lereng. Stabilitas lereng dipengaruhi oleh ketinggian lereng, sudut lereng, kekuatan massa batuan, jenis batuan, dan tingkat air tanah. Tujuan dari penelitian ini adalah untuk mengetahui apakah kemiringan secara stabil ditampilkan dalam nilai Safety Factor (FK). Proses analisis dilakukan dengan menggunakan Metode Elemen Hingga dan Metode Kesetaraan Batas. Analisis dilakukan pada material batuan dasar dan tiang pancang. Analisis batuan dasar menggunakan Metode Elemen Hingga di daerah Goa di Bagian A - B dan C - D memperoleh nilai SRF 4,6 dan 16 dengan total perpindahan 13,771 m dan 6 m. Di daerah Gunung Bindis Bagian E - F dan G - H diperoleh nilai SRF 2,5 dan 4,75 dengan total perpindahan 11,8 m dan 3 m. Analisis bahan timbunan di Goa Di daerah dengan Bagian A - B dan C - D nilai FK diperoleh = 2.11 dan 1.56 dan untuk Bagian C - D FK 2.62 dan 1.94. Di Wilayah Gunung Bindis dengan bagian E - F dan G - H nilai FK = 1,59 dan untuk Bagian G - H nilai FK = 2,31 dan 1,57. Pembuangan memperoleh jumlah volume yang akan ditampung di masing-masing area 11.175.191 LCM dan 74.749.919,45 LCM.

scholarly journals Analisis Stabilitas Timbunan pada Tanah Dasar Berbentuk Lereng dengan Metode Elemen Hingga

2021 ◽  
Vol 6 (3) ◽  
pp. 179
Author(s):  
Mufidhiansyah Fahmi ◽  
Ikhya Ikhya
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Slope Stability ◽  
Safety Factor ◽  
Sand Pile ◽  
Rock Fill ◽  
Geometry Analysis ◽  
Element Method

ABSTRAKAnalisis menggunakan program PLAXIS 2D dengan tinggi timbunan dan kemiringan tanah dasar bervariasi tanpa dan dengan perkuatan rock fill sehingga diperoleh kebutuhan rock fill agar faktor keamanan memenuhi syarat. Hasil analisis dengan kemiringan tanah dasar 1V:8H diperoleh kebutuhan rock fill timbunan lempung dengan tinggi 5m, 10m, 15m dan 20m sebesar 0%; 24,7%; 45,5% dan 59,1% sedangkan timbunan pasir sebesar 14,5%; 43,2%; 62,4% dan 71,4%. Pada kemiringan tanah dasar 1V:6H diperoleh kebutuhan rock fill masing-masing ketinggian timbunan lempung sebesar 5%; 45,8%; 59,3% dan 66.6%, sedangkan timbunan pasir sebesar 33,1%; 62,3%; 71,9% dan 73,2%. Pada kemiringan tanah dasar 1V:4H diperoleh kebutuhan rock fill masing-masing ketinggian timbunan lempung sebesar 48,9%; 66,7%; 75,6% dan 81,3%; sedangkan timbunan pasir sebesar 60,1%; 72,6%; 80,5% dan 84%. Variasi jenis mesh menghasilkan faktor keamanan yang tidak signifikan antar jenis mesh dikarenakan lapisan timbunan yang dimodelkan relatif rapat. Analisis geometri tanah dasar bertangga dengan lurus tidak menunjukkan pengaruh yang signifikan terhadap faktor keamanan.Kata kunci: stabilitas lereng, timbunan, tanah dasar, rock fill, metode elemen hingga, PLAXIS 2D ABSTRACTAnalysis using PLAXIS 2D program with varying heights and slopes of subgrade without and with rock fill reinforcement in order to obtain the need for rock fill so that the safety factor meets the requirements. The results of the analysis with a subgrade slope of 1V: 8H obtained the need for rock fill clay pile with a height of 5m, 10m, 15m and 20m of 0%; 24.7%; 45.5% and 59.1% while the sand pile was 14.5%; 43.2%; 62.4% and 71.4%. At a subgrade slope of 1V: 6H, the required rock fill height for each clay pile is 5%; 45.8%; 59.3% and 66.6%, while the sand pile was 33.1%; 62.3%; 71.9% and 73.2%. At 1V: 4H subgrade slope, the required rock fill height for each clay pile height is 48.9%; 66.7%; 75.6% and 81.3%; while the sand pile was 60.1%; 72.6%; 80.5% and 84%. Variation of mesh types resulted in insignificant safety factor between mesh types because the modeled embankment layer was relatively tight. The geometry analysis of the straight stepped subgrade did not show a significant effect on the safety factor.Keywords: slope stability, embankment, subgrade, rock fill, Finite Element method, PLAXIS 2D

The Research on Application of Strength Reduction Finite Element Method in Stability Analysis of Weak Intercalated Rock Tunnel

2011 ◽  
Vol 255-260 ◽  
pp. 1926-1929
Author(s):  
Da Kun Shi ◽  
Yang Song Zhang
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Rock Mass ◽  
Safety Factor ◽  
Slip Surface ◽  
Strength Reduction ◽  
Surrounding Rock ◽  
Stability Of Surrounding Rock ◽  
The Stability ◽  
Element Method

Based on geologic condition of one tunnel surrounding rock mass, systematic numerical tests had been carried out to study the stability of surrounding rock mass with different distributions of weak intercalated rock by the FEM software ABAQUS and strength reduction finite element method. Some quantificational results about the stability of surrounding rock mass were summarized. And the safety factor and latent slip surface were worked out. The stability of surrounding rock mass was judged by strength reduction finite element method. According to the analysis above, it’s known that the discrepancy of two rules is small; the safety factor is the lowest when weak intercalated rock in vault, and when at bottom, it’s higher than that of in vault. The conclusion can be used to guide the procedure of construction and ensure the safety.

scholarly journals Analytical and experimental research on stability of large slenderness ratio horizontal hydraulic hoist

2018 ◽  
Vol 10 (10) ◽  
pp. 168781401880347 ◽  
Author(s):  
Ji Zhou ◽  
Duan-Wei Shi ◽  
Zhi-Lin Sun ◽  
Tao Bi ◽  
Xiong-Hao Cheng ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Safety Factor ◽  
Slenderness Ratio ◽  
Hydraulic Cylinder ◽  
Ratio Test ◽  
The Finite Element Method ◽  
Sliding Bearing ◽  
The Stability ◽  
Element Method

Taking the hydraulic cylinder for the miter gate in Dateng Gorges Water Conservancy Project as the object, a large slenderness ratio test hydraulic cylinder was designed based on the similarity theory. The buckling analysis of the test hydraulic cylinder was carried out by the finite element method, considering the friction at the supports, the misalignments between piston rod and cylinder tube, and gravity. The results indicate that the stability safety factor is 10.55. A buckling experimental system was established, and the buckling stability of the test hydraulic cylinder was tested for the sliding bearing support and the rolling bearing support at the piston-rod end, respectively. The stability safety factor is over 9.01 and 6.82 relevantly. The similarities and differences among the results of the finite element method, experimental method, NB/T 35020-2013, and two-sections pressure bar method were analyzed. Experimental and analytical results clearly show that the friction at the supports is a key factor in determining the magnitude of the stability safety for large slenderness ratio horizontal hydraulic hoist and utilizing the sliding bearing can effectively improve the stability safety factor.

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