An Improved Design of the Manipulator on Automatic Tool Changer

The tool falling and vibration faults often occur in the process of tool changing, In order to improve the stability of the tools on automatic tool changer, a new structure of the manipulator is presented. The new manipulator contains two-point locking instead of the original one-point locking, and the tools can be clamped more tightly. When the old manipulator is slotting the tool, the forces are analyzed, and the working load and parameters is determined by calculating and analyzing the output curve of manipulator. The three-dimensional model is built in ADMS, and the validity of the new designed manipulator is verified by the simulation in a limit state. The simulation result shows that the new manipulator can increase the ability of tool clamping effectively.

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Calibration of a Three-dimensional slope stability evaluation in Brazilian iron open pit mine

10.21203/rs.3.rs-337958/v1 ◽

2021 ◽

Author(s):

Vidal Félix Navarro Torres ◽

Rodrigo Dockendorff ◽

Juan Manuel Girao Sotomayor ◽

Cristian Castro ◽

Aristotelina Ferreira da Silva

Keyword(s):

Three Dimensional ◽

Structural Features ◽

Open Pit ◽

Dimensional Model ◽

Three Dimensional Model ◽

Strength Parameters ◽

Dimensional Section ◽

The Stability ◽

Evaluation Techniques

Abstract It has historically been frequent among geotechnical practitioners, that the stability analysis of the slopes of an open pit is performed using a two dimensional section representing the highest and steepest walls within a certain geological setting. However, the literature shows that to predict rupture events in an open pit, a three-dimensional analysis would better represent the actual conditions, as the spatial distribution of the lithology and the structural features play an important role when defining the stability of the slopes. This paper presents the case study of an open it located in Brazil, which experienced instabilities between the years 2001-2019. An evaluation of the behavior of the open pit was performed by calibrating the strength parameters to represent the best documented rupture events. The three-dimensional model was made using the FLAC3D software. The results show that there is a good correlation between the results of the model and the reports of past instabilities. Finally, recommendations are presented for the inter-ramp angles for each lithology based on the calibrated stability analyzes performed. This work seeks to contribute to the knowledge in evaluation techniques for the three-dimensional behavior of open pits.

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Stability of Three-Dimensional Slurry Trenches with Inclined Ground Surface: A Theoretical Study

Advances in Materials Science and Engineering ◽

10.1155/2015/362160 ◽

2015 ◽

Vol 2015 ◽

pp. 1-7

Author(s):

Xiao-Fei Jin ◽

Shu-Ting Liang ◽

Xiao-Jun Zhu

Keyword(s):

Safety Factor ◽

Three Dimensional ◽

Ground Surface ◽

Theoretical Method ◽

Dimensional Model ◽

Three Dimensional Model ◽

Coulomb Type ◽

The Stability ◽

Inclined Angle ◽

2D And 3D

Stability of slurry trenches is an important issue during the construction of the groundwater cutoff walls and diaphragm walls, and thus gradually draws attention. In this paper, a theoretical method for a three-dimensional trench model with an inclined ground was proposed. Based on the Coulomb-type force equilibrium, a safety factor assessing the stability was derived. The results showed that the existing two-dimensional model was conservative compared to the present three-dimensional model; concretely, a greater inclined angle of the inclined ground and trench length decreased the safety factor. This work could be used to assess the trench stability for both 2D and 3D cases with inclined ground surfaces.

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A Improved Design of Mechanical Structure of a Coin-Wrapping Machine Based on Pro/E Software

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.288.48 ◽

2013 ◽

Vol 288 ◽

pp. 48-53

Author(s):

Xue Dong Jing ◽

Ding Wei ◽

Siwen Kang

Keyword(s):

3D Modeling ◽

Three Dimensional ◽

Integrated Model ◽

Dimensional Model ◽

Three Dimensional Model ◽

Mechanical Structure ◽

Modeling Software ◽

New Type ◽

Simulation Results ◽

Improved Design

This paper has designed a new type of mechanical structure for a coin-wrapping machine; It’s three-dimensional model has been established by Pro / E 3D modeling software and the kinematic of the Integrated model analysis has been carried out. The simulation results have shown that the coin wrapping process can be simplified and the efficiency can also be improved with the new structure, thereby reducing the costs.

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The assembly of ionic currents in a thalamic neuron I. The three-dimensional model

Proceedings of the Royal Society of London Series B Biological Sciences ◽

10.1098/rspb.1989.0049 ◽

1989 ◽

Vol 237 (1288) ◽

pp. 267-288 ◽

Cited By ~ 120

Keyword(s):

Three Dimensional ◽

State Diagram ◽

Ionic Currents ◽

Stability Diagram ◽

Repetitive Firing ◽

Two Dimensional ◽

Dimensional Model ◽

Three Dimensional Model ◽

Two Dimensional Model ◽

The Stability

We have previously discussed qualitative models for bursting and thalamic neurons that were obtained by modifying a simple two-dimensional model for repetitive firing. In this paper we report the results of making a similar sequence of modifications to a more elaborate six-dimensional model of repetitive firing which is based on the Hodgkin–Huxley equations. To do this we first reduce the six-dimensional model to a two-dimensional model that resembles our original two-dimensional qualitative model. This is achieved by defining a new variable, which we call q . We then add a subthreshold inward current and a subthreshold outward current having a variable, z , that changes slowly. This gives a three-dimensional ( v, q, z ) model of the Hodgkin–Huxley type, which we refer to as the z -model. Depending on the choice of parameter values this model resembles our previous models of bursting and thalamic neurons. At each stage in the development of these models we return to the corresponding seven-dimensional model to confirm that we can obtain similar solutions by using the complete system of equations. The analysis of the three-dimensional model involves a state diagram and a stability diagram. The state diagram shows the projection of the phase path from v, q, z space into the v, z plane, together with the projections of the curves ż = 0 and v̇ = q̇ = 0. The stability of the points on the curve v̇ = q̇ = 0, which we call the v, q nullcurve, is determined by the stability diagram. Taken together the state and stability diagrams show how to assemble the ionic currents to produce a given firing pattern.

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Three-Dimensional Simulation of the Influences of Operational Parameters on Stability of Formation-Cement Sheath-Casing Combination

Materials Science Forum ◽

10.4028/www.scientific.net/msf.980.525 ◽

2020 ◽

Vol 980 ◽

pp. 525-546

Author(s):

Yong Wen Yuan ◽

Yan Jun Cheng ◽

Jin Xin Zhu ◽

Liu Yi Li

Keyword(s):

Cross Section ◽

Three Dimensional ◽

Von Mises Stress ◽

Physical Parameters ◽

Dimensional Model ◽

Operational Parameters ◽

Three Dimensional Model ◽

Cement Sheath ◽

The Stability ◽

Casing Pressure

At present, most of the studies of the stability of the formation-cement sheath-casing combination have been mainly based on the plane, and the three-dimensional model established is only one example. There is no systematic study of the influence of physical parameters and process parameters on the stability of the combined body under the three-dimensional model and the action of triaxial crustal stress. Through the establishment of three-dimensional formation-cement sheath-casing linear elastic combination model, we can study the influence of operational parameters (cement sheath pressure, casing cross section pressure, inner casing pressure, ellipticity of borehole, centrality of casing, thickness of cement sheath) by the two interfaces’ Von Mises stress and the total displacement of the combination body. It is pointed out that the pressure of cement sheath, and casing cross section pressure have no effect on the stability of formation, cement sheath and casing; The higher the ellipticity of the borehole, the eccentricity of the casing (position 1, 2) and the thickness of the cement sheath, the higher the stability of the second interface of the cementing; The higher the inner casing pressure and the eccentricity of the casing(position 3), the lower the stability of the second interface of the cementing; The higher the eccentricity of the casing (position 2,3) and the thickness of the cement sheath, the higher the stability of the first interface of the cementing; The higher the inner casing pressure, the eccentricity of the casing (position 1) and the ellipticity of the borehole, the lower the stability of the first interface of the cementing; The higher the eccentricity of the casing (position 2,3) and thickness of the cement sheath, the higher the stability of the casing; The higher the inner casing pressure, the ellipticity of the borehole and the eccentricity of the casing(position 1), the lower the stability of the casing. Through this study, according to the formation stress, the formation physical parameters (elastic modulus, Poisson's ratio, density), optimize the operational parameters, ensure the long-term integrity of the combination.

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Three-dimensional rotational angiography of the left atrium and the oesophagus: the short-term mobility of the oesophagus and the stability of the fused three-dimensional model of the left atrium and the oesophagus during catheter ablation for atrial fibrillation

EP Europace ◽

10.1093/europace/euw187 ◽

2016 ◽

Vol 19 (8) ◽

pp. 1310-1316 ◽

Cited By ~ 1

Author(s):

Zdenek Starek ◽

Frantisek Lehar ◽

Jiri Jez ◽

Martin Scurek ◽

Jiri Wolf ◽

...

Keyword(s):

Atrial Fibrillation ◽

Catheter Ablation ◽

Left Atrium ◽

Three Dimensional ◽

Rotational Angiography ◽

Dimensional Model ◽

Three Dimensional Model ◽

Short Term ◽

The Stability

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Investigations on the Stability of a Two-Wheeled Vehicle with a Tendency to Topple Sideways

Journal of Physics Conference Series ◽

10.1088/1742-6596/2070/1/012183 ◽

2021 ◽

Vol 2070 (1) ◽

pp. 012183

Author(s):

R Sidharth ◽

V K Pravav ◽

G Nitheesh Kumar ◽

Pramod Sreedharan ◽

G Gayathri

Keyword(s):

Sliding Mode ◽

Three Dimensional ◽

Sliding Mode Controller ◽

Dimensional Model ◽

Three Dimensional Model ◽

Wheeled Vehicle ◽

The Stability ◽

Wheeled Vehicles

Abstract Two-wheeled vehicles are the most commonly used means of transportation. Every day many unspoken tragedies are happening on the roads that kill the hope of many families. The primary cause of this is the inherent instability of the two-wheeled vehicle. In this paper, the precession effect of the gyroscope is used to prevent the sideway toppling of the bicycle. When the bicycle begins to tilt, the torque created by the gyroscope’s precession effect is applied to the gimbal, and the ensuing reaction moment keeps the bicycle upright. The movements of a bicycle with a gimbal placed on the bottom are measured, and a three-dimensional model with a sliding mode controller is created and simulated.

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