DEM Simulation for Specific Gravity Separation of Plastic Particles Using Air-Table

2011 ◽  
Author(s):  
Yuki Tsunazawa ◽  
Tingwei Wang ◽  
Kenichiro Torige ◽  
Chiharu Tokoro
Keyword(s):  
Specific Gravity ◽  
Wind Velocity ◽  
Gravity Separation ◽  
Waste Products ◽  
Dem Simulation ◽  
3 Dimensional ◽  
Simulation Results ◽  
Basic Behavior ◽  
Air Table

Air-table is one of the specific gravity separators which have been expected as an effective dry separator for waste products such as plastic or glass. The objective of this study is an application of DEM to describe the basic behavior of plastic particles in an air-table separation. The mechanism of particles separation on the table has not been well-known because air-table contains many instrument parameters such as slope and shape of the table, height of the riffle, angle, amplitude and frequency of vibration and wind velocity. In this study, two types of particles which have same diameter and different density were simulated and 3 dimensional position and velocity of them were investigated in the various conditions of instrumental parameters. DEM simulation results showed that the riffle on the table play an important role for the particles separation.

scholarly journals Analytical Calculation for Capacitances of Electrode Patterns in Touch Panels

2017 ◽  
Vol 3 (1) ◽  
Author(s):  
Bau-Jy Liang ◽  
Don-Gey Liu ◽  
Chia-Hung Yeh ◽  
Hsiao-Chun Chen ◽  
Yu-Chen Fang ◽  
...  
Keyword(s):  
Analytical Solution ◽  
Closed Form ◽  
Analytical Method ◽  
Analytical Calculation ◽  
3 Dimensional ◽  
Simulation Results ◽  
Complex Patterns ◽  
Touch Panels

AbstractIn this paper, an accurate 3-dimensional (3-D) analytical solution is proposed to calculate the projective capacitances of touch panels. In this study, both simple and complex patterns were investigated for the calculation. We propose a partition strategy to divide a pattern into many rectangular or triangular sub-patterns. Each sub-pattern can be further cut into 2-D slices. The capacitance of a 2-D slice was then solved by our closed-form formulae. The total capacitance of a pattern was obtained by integrating up all the partial capacitances of the slices. In this study, the precision of our analytical method was examined by comparing the simulation results obtained from Q3D

Study of the Effect of Liquid on Mixing Process for Size-Type Binary Particulate Systems by DEM Simulation

2011 ◽  
Vol 317-319 ◽  
pp. 2047-2050
Author(s):  
Hong Li Gao ◽  
You Chuan Chen
Keyword(s):  
Discrete Element Method ◽  
Liquid Bridge ◽  
Discrete Element ◽  
Mixing Process ◽  
Dem Simulation ◽  
Segregation Process ◽  
Size Type ◽  
Simulation Results ◽  
Horizontal Drum ◽  
Particulate Systems

The discrete-element method(DEM) was employed to simulate the mixing and segregation process for size-type binary particulate systems in a rotating horizontal drum for dry particulate systems and wet particulate systems. The effect of interstitial liquid on the mixing and segregation process were studied. The simulation results showed that the liquid bridge between particles play an important role in mixing and segregation process, as a result, segregation may be mitigated and mixing may be enhanced. To assess the accuracy of the simulation result, some comparisons were made with the experimental results in the literature.

Estimation of Grasp Envelope Using a 3-Dimensional Kinematic Model of the Hand

2007 ◽  
Vol 51 (15) ◽  
pp. 889-893 ◽  
Author(s):  
Jaewon Choi ◽  
D. Christian Grieshaber ◽  
Thomas J. Armstrong
Keyword(s):  
Kinematic Model ◽  
Experimental Studies ◽  
Design Stage ◽  
Contact Algorithm ◽  
3 Dimensional ◽  
Rotation Method ◽  
Simulation Results ◽  
Practical Information ◽  
Object Shapes ◽  
Simple Contact

A 3-dimensional kinematic model of the hand was developed. The model predicts hand posture using a simple contact algorithm, which detects a contact between hand segments and the object. Using the 3-dimensional kinematic model of the hand, we estimated grasp envelopes because the space requirement for a specific task is an important aspect to be considered in the task's design stage. For this purpose, two hose insertion methods – a straight method and a rotation method – were simulated. The simulation results were compared favorably with the experimental studies by the previous researches. The model can be used to estimate grasp envelopes for varying hand sizes, object sizes, object shapes, and grip types. The model gives useful and practical information about the grasp envelope to the engineers who design parts or work space.

scholarly journals KAJIAN PENGARUH MATERIAL PROPERTIS DOMAIN BATUAN DASAR TERHADAP KESTABILAN LERENG PADA NIKEL LATERIT DI SITE POMALAA , SULAWESI TENGGARA, PT ANTAM Tbk

2020 ◽  
Vol 1 (1) ◽  
pp. 453-462
Author(s):  
Mutiara Andini ◽  
Niki Rahma Rizkita ◽  
Pherto Rimos ◽  
Febri E. Prihasto ◽  
Ahmad R. Trilaksana ◽  
...  
Keyword(s):  
Specific Gravity ◽  
Key Words ◽  
Safety Factor ◽  
Material Properties ◽  
Friction Angle ◽  
Probability Of Failure ◽  
Mining Operations ◽  
Average Value ◽  
Simulation Results ◽  
Proper Material

ABSTRAK Untuk mendukung kegiatan operasional penambangan, perlu dilakukan pembuatan kajian geoteknik yang bertujuan sebagai rencana awal desain lereng tambang maupun mengevaluasi kestabilan lereng pada saat kegiatan penambangan berlangsung. Untuk pembuatan kajian geoteknik di Site Pomalaa, dilakukan pengambilan 15 sampel untuk masing-masing domain (Hazburgit, Dunit, Serpentinit dan Peridotit) yang dibagi menjadi 5 sampel limonit, 5 sample saprolit dan 5 sampel bedrock. Selanjutnya, sampel tersebut dilakukan pengujian di laboratorium untuk mendapatakan nilai material properties. Material propertis limonit pada setiap domain  memiliki rentang nilai kohesi 31,22 kN/m2- 40,49 kN/m2, sudut geser dalam 31,30o-37,36o, berat jenis basah 11,56 kN/m2-12,89 kN/m2, UCS 0,11Mpa – 0,59 Mpa.Sedangkan nilai material propertis pada saprolit memiliki rentang nilai kohesi 31,22 kN/m2-39,18 kN/m2, sudut geser dalam 34,71o-39,11o, berat jenis basah 10,86 kN/m2-13,52 kN/m2, UCS 0,19Mpa – 0,29 MPa. Material propertis tersebut selanjutnya digunakan sebagai parameter dalam melakukan analisis kestabilan lereng dengan mengeluarkan nilai faktor keamanan (FK) dan probability of failure (PoF). Pada kajian ini dilakukan simulasi dengan 4 pendekatan : (a) Pertama, menganalisis lereng dengan domain geologi tunggal, (b)Kedua, menganalisis lereng dengan menggabungkan 2 domain geologi yang berbeda, (c) Ketiga, menganalisis lereng dengan menggabungkan 3 domain geologi yang berbeda, (d) Menganalisis lereng dengan menggabungkan 4 domain geologi yang berbeda. Hasil simulasi dengan menggunakan 4 pendekatan tersebut menunjukkan nilai rata-rata FK limonit secara berturut sebesar 1.72, 1.71,1.73, dan 1.73 . Sedangkan nilai FK saprolit secara berturut sebesar 1.74, 1.78 , 1.75 dan  1.74. Rata-rata probability of failure pada simulasi ini dibawah 1%. Dari hasil simulasi dapat dilihat bahwa nilai faktor keamanan dari hasil simulasi beberapa material menunjukkan nilai yang konsisten, sehingga dapat dikatakan bahwa nilai material propertis nikel laterit pada batuan dasar yang berbeda cenderung sama (homogen), oleh karena itu pengambilan sampel geoteknik di site pomalaa tidak sensitif terhadap domain batuan. Key words: Domain Batuan Dasar, Kohesi, Sudut Geser Dalam, Berat Jenis Basah, UCS, Faktor Keamanan, Probability of Failure.  ABSTRACT Concerning mining operations activities, geotechnical analysis should be carried out with the aim of planning the initial design of slope and evaluating the stability of the slope during mining activities. For making geotechnical studies at the Pomalaa Site, 15 samples were taken for each domain (Hazburgit, Dunit, Serpentinit and Peridotit) which were allocated into 5 samples for limonite, 5 samples for saprolite and 5 samples for bedrock. Furthermore, the sample is tested in a laboratory to obtain the value of material properties. Limonite property material in each domain has a range of cohesion values of 31.22 kN / m2-40.49 kN / m2, friction angle at 31.30o-37.36o, wet density 11.56 kN / m2-12.89 kN / m2, UCS 0.11Mpa - 0.59 Mpa. While the value of proper material in saprolite has a range of cohesion values of 31.22 kN / m2-39.18 kN / m2, shear angle in 34.71o-39.11o, wet specific gravity 10.86 kN / m2-13.52 kN / m2, UCS 0.19Mpa - 0.29 Mpa. The property material is then used as a parameter input to obtain slope stability analysis by issuing factor of safety (FK) and probability of failure (PoF) values ). In this case a simulation was conducted to 4 approaches: (a) First, analyzing slopes with a single geological domain, (b) Second, analyzing slopes by combining 2 different geological domains, (c) Third, analyzing slopes by combining 3 different geological domains , (d) Analyze slopes by combining 4 different geological domains. The simulation results using the 4 approaches show the average value of FK limonite which are 1.72, 1.71.1.73, and 1.73 respectively. While FK saprolite values were 1.74, 1.78, 1.75 and 1.74 respectively. The average probability of failure in this simulation is below 1%. From the simulation results it can be seen that the value of the safety factor from the simulation results of several materials shows a consistent value, so it can be said that the material value of laterite nickel properties in different bedrock tends to be the same (homogeneous), therefore geotechnical sampling at the Pomalaa site is not sensitive to the rock domain. Key words: Host Rock Domain, Cohesion, Friction angle, Wet Specific Gravity, UCS, Safety Factor, Probability of Failure.

Effect of specific gravity separation on seed quality improvement of coriander var. CO3

2021 ◽  
Vol 23 (2) ◽  
pp. 115-119
Author(s):  
R. Chandraprakash ◽  
P. Masilamani ◽  
P. Rajkumar ◽  
R. Geetha ◽  
V. Alex Albert ◽  
...  
Keyword(s):  
Quality Improvement ◽  
Specific Gravity ◽  
Seed Quality ◽  
Gravity Separation

A Monolithic Three-Axis Accelerometer with Low Cross-Axis Sensitivity

2011 ◽  
Vol 403-408 ◽  
pp. 691-696
Author(s):  
Chang De He ◽  
Wen Dong Zhang ◽  
Ji Jun Xiong ◽  
Chen Yang Xue ◽  
Gui Xiong Shi
Keyword(s):  
High Performance ◽  
Proof Mass ◽  
Cantilever Beams ◽  
3 Dimensional ◽  
Simulation Results ◽  
The Cross ◽  
Sensitive Structure ◽  
Cross Axis

A 50,000g three-axis accelerometer using a single proof mass is presented. The sensitive structure is made of a single proof mass and eight cantilever beams. Twelve piezoresistors are placed on the cantilevers symmetrically, which can be used to detect 3-dimensional acceleration. The symmetric placement of the piezoresistors brings the reasonable sensitivity and simultaneously decreases the cross-axis sensitivity significantly. Simulation results show that the sensitivity in X-, Y- and Z-axis are 0.806uV/g, 0.806uV/g and 3.71uV/g respectively with 5V supply and the cross-axis sensitivities are all less than 2.4%, which ensures the high performance of the three-axis accelerometer.

Note on Factors Governing the Porosity of Wind Deposited Sands

1953 ◽  
Vol 90 (1) ◽  
pp. 48-56 ◽  
Author(s):  
J. Kolbuszewski
Keyword(s):  
Specific Gravity ◽  
Wind Velocity ◽  
Average Velocity ◽  
High Wind ◽  
Average Porosity

AbstractAfter establishing average velocity of wind/average porosity curve for wind deposited sands, where it was shown that low wind velocity produces higher porosity than high wind velocity, further investigation was made and sands of various characteristics were used. It was established that the velocity of wind/porosity of deposit relationship is a more complicated function than was previously expected and some of the reasons are explained. The first indication of the influence of shape of the grain and the specific gravity of grains on the obtained results is registered. Further steps in the research are indicated.

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