Modal Analysis of the Line Inspection Robot's Manipulator

2014 ◽  
Vol 681 ◽  
pp. 100-105
Author(s):  
Jian Li ◽  
Xu Dong ◽  
Zhong Cai Zheng ◽  
Yan Gao ◽  
Zhen Ting Jiang ◽  
...  
Keyword(s):  
Modal Analysis ◽  
Theoretical Basis ◽  
Three Dimensional ◽  
Robot Arm ◽  
Overhead Line ◽  
Post Processing ◽  
Low Frequencies ◽  
Overhead Lines ◽  
Inspection Robot ◽  
Three Dimensional Models

The Line Inspection Robot is used to detect the line's defects when it walks on the overhead lines. It will be swinging under its own vibration and the action of wind , due to the robot arms hanging on overhead line alone ,so the dynamic characteristics of robot arm cannot be ignored. In this paper, we establish three-dimensional models of the line inspection robot's manipulator with double manipulators of antisymmetric structure, and conduct solving and post-processing of statics and modal analysis after meshing and applying constraints. The manipulator's low frequencies and vibration modals are drawn, so we can provide a theoretical basis for the reasonable optimization improvements to the line inspection robot's manipulator with double manipulators of antisymmetric structure.

Modal Analysis of the Line Inspection Robot's Guide Platform

2014 ◽  
Vol 685 ◽  
pp. 265-270 ◽  
Author(s):  
Xu Dong ◽  
Zhong Cai Zheng ◽  
Yan Gao ◽  
Hai Yong Xiao
Keyword(s):  
Modal Analysis ◽  
High Voltage ◽  
Optimization Design ◽  
Three Dimensional ◽  
Power Lines ◽  
Inspection Robot ◽  
Dimensional Models ◽  
Three Dimensional Models ◽  
High Voltage Power Lines

Line inspection robot detects defects in high-voltage power lines, and it exists the instability of the movement in the process of surmounting obstacles due to its own gravity and vibration. So the robot is easily falling from the lines. The vibration sources of the line inspection robot with double manipulators of antisymmetric structure are mainly from the rotation of the walking motors of holding mechanism, the reversal motors of mechanical arm and driving motors of guide platform. This paper established the three-dimensional models of the line inspection robot's guide platform and conducted the statics and modal analysis. The results concluded the inherent frequencies and vibration modals of the guide platform, and then provided a theoretical guidance for the optimization design of the guide platform.

Thermal Analysis of Dedicated Computer Based on ANSYS

2011 ◽  
Vol 697-698 ◽  
pp. 277-281
Author(s):  
Y.R. Zhang ◽  
L. Gao ◽  
S.J. Li ◽  
H.X. Bi
Keyword(s):  
Thermal Analysis ◽  
Material Properties ◽  
Theoretical Basis ◽  
Three Dimensional ◽  
Test Results ◽  
Post Processing ◽  
Ansys Software ◽  
Computer Based ◽  
Three Dimensional Models ◽  
Setting Parameters

After creating the three-dimensional models of dedicated computer, models can be smoothly put into ANSYS through interface between Pro/E and ANSYS. By selecting the grid cells, setting parameters of material properties, dividing grids, applying load and boundary conditions and post-processing, the temperature contours of the whole case and its key components are got. Compared with the test results, it was verified that the feasibility and rationality of carrying out thermal simulation by ANSYS software, providing a theoretical basis for the designers to optimize dedicated computer case.

scholarly journals Processing Three-Dimensional Models of Archaeological Artifacts

2021 ◽  
Vol 20 (7) ◽  
pp. 48-61
Author(s):  
Pavel V. Chistyakov ◽  
Ekaterina N. Bocharova ◽  
Ksenia A. Kolobova
Keyword(s):  
Three Dimensional ◽  
3D Models ◽  
International Standards ◽  
Post Processing ◽  
Three Dimensional Model ◽  
Scaled Model ◽  
Three Dimensional Modeling ◽  
Dimensional Modeling ◽  
Dimensional Models ◽  
Three Dimensional Models

This article provides a detailed account of the process of scanning, post-processing and further manipulation of three-dimensional models obtained with structured light scanners. Purpose. The purpose of the study is determined by the need for national archaeologists to learn the methods of three-dimensional modeling for the implementation of scientific research corresponding to international standards. Unfortunately, this direction in national archaeology began to develop in a relatively recent time and there is a lag in the application of three-dimensional modeling of national archaeology compared to the world level. Results. Any archaeological, experimental or ethnographic artifact can be used for three-dimensional scanning. To perform post-processing of three-dimensional models it is necessary to carry out primary scanning of an artifact by one of the existing algorithms. The algorithm for creating models, their positioning, simplification, saving in various formats and export is described. The main sequence of 3D models post-processing includes: processing of groups of scanned projections (their cleaning and alignment), creation of artifact model and processing/rectification of the resulting model using special software. Conclusion. As a result of correct implementation of the algorithm, the researcher receives a scaled model completely corresponding to the original artifact. Obtaining a scalable, texture-free three-dimensional model of the artifact, which fully corresponds to the original and exceeds a photograph in the quality of detail transfer, allows a scientist to conduct precise metric measurements and any procedures of non-invasive manipulation of the models. The ability to access a database of three-dimensional models of archaeological collections greatly simplifies the work of archaeologists, especially in situations when country borders are closed.

Modal analysis of the diaphragm of the semicircular canal

2001 ◽  
Vol 11 (1) ◽  
pp. 43-54
Author(s):  
E. Njeugna ◽  
C.M. Kopp ◽  
J.-L. Eichhorn
Keyword(s):  
Modal Analysis ◽  
Semicircular Canal ◽  
Static Pressure ◽  
Three Dimensional ◽  
Vibration Modes ◽  
Modes Of Vibration ◽  
Crista Ampullaris ◽  
Static Pressure Difference ◽  
Three Dimensional Models ◽  
Internal Viscosity

The aim of this paper is to determine the domain of validity of calculated quasi-static deformations of the cupula and of ciliar deflections on the crista ampullaris. Several three-dimensional models of the isolated ampullar diaphragm of the human semicircular canal and of that of the frog are studied theoretically by modal analysis. The four first modes of vibration are determined for each structure. Numerical simulations prove that for the first mode of vibration, the cupular deformation has the same shape as that obtained by applying a static pressure difference across the ampullar diaphragm. We studied also the effect of the mechanical properties (Young's modulus and Poisson's coefficient) of the components of the ampullar diaphragm on the vibration modes and their frequencies. The condition, which must be satisfied by the cupular internal viscosity, to have resonance near the natural frequency of the ampullar diaphragm is determined.

scholarly journals Amphitheater of Volterra: Case Study for the Representation of Excavation Data

2017 ◽  
Vol 1 (2) ◽  
pp. 269-281
Author(s):  
Carlo Battini ◽  
Elena Sorge
Keyword(s):  
Structure From Motion ◽  
Mobile Application ◽  
Three Dimensional ◽  
Laser Scanner ◽  
3D Models ◽  
Post Processing ◽  
The Subject ◽  
Three Dimensional Models ◽  
Digital Projection

The work presented wants to show how different techniques of expeditious relief can be combined together in order to better describe the subject studied. Techniques of digital projection as laser scanner, topography and Structure from Motion can be used simultaneously and interact with each other to create a rich database of colorimetric and metrics information. Methodologies that, at the same time, present the peculiarities and errors of peculiar relief of the technology employed.The case study examined in this type of research is the discovery of the amphitheater of Volterra. Discovered in July 2015 during the phases of reclamation of a stream, is located close to Porta Diana and a few hundred meters from the Roman Theater discovered in the last century. An excavation campaign undertaken Between October and November 2015 has allowed us to bring to light the crests of the supporting walls of the structure, revealing the presence of the three orders and a depth of about ten meters.The step of post processing has finally seen the use of three-dimensional models acquired both for the creation of images metrics necessary to the study of the stratigraphic units, both for studying a mobile application, 3D models and data of the excavation, easy to use for transmitting the information collected.  

scholarly journals A Simple Photogrammetry Rig for the Reliable Creation of 3D Artifact Models in the Field

2016 ◽  
Vol 4 (1) ◽  
pp. 71-86 ◽  
Author(s):  
Samantha Thi Porter ◽  
Morgan Roussel ◽  
Marie Soressi
Keyword(s):  
Western Europe ◽  
Production Systems ◽  
Low Cost ◽  
Three Dimensional ◽  
3D Scanning ◽  
Upper Paleolithic ◽  
Field Conditions ◽  
Post Processing ◽  
Three Dimensional Models

AbstractThree-dimensional (3D) artifact modeling is becoming an increasingly utilized tool in archaeology. In comparison with other methods of 3D scanning, photogrammetry has the benefits of being relatively inexpensive, mobile, and more adaptable for use in field conditions. As part of a larger project to document variability in lithic production systems across the Middle to Upper Paleolithic Transition in Western Europe, we developed a photography rig for the express purpose of systematically capturing images for the creation of 3D photogrammetric models. This low-cost rig greatly streamlines both the photo-taking and post-processing stages of model creation. Additional tips relating to the coating of difficult-to-capture objects with a mineral spray are also provided. Three-dimensional models of lithic cores from the Châtelperronian, Protoaurignacian, and Early Aurignacian levels of the site of Les Cottés (France) are presented as examples of the quality of model that can be produced using this system.

Predicting Damping of a Cantilever Beam With a Bolted Joint Using Quasi-Static Modal Analysis

2017 ◽  
Author(s):  
Emily A. Jewell ◽  
Matthew S. Allen ◽  
Robert Lacayo
Keyword(s):  
Modal Analysis ◽  
Three Dimensional ◽  
Lessons Learned ◽  
Effective Stiffness ◽  
Bolt Preload ◽  
Mesh Density ◽  
Three Dimensional Models ◽  
Nonlinear Modal Analysis ◽  
Stiffness And Damping ◽  
2D And 3D

Bolted joints are common in assembled structures and are a large contributor to the damping in these assemblies. The joints can cause the structure to behave nonlinearly, and introduce uncertainty because the effective stiffness and damping at the joint are typically unknown. Consequently, improved modeling methods are desired that will address the nonlinearity of the jointed structured while also providing reasonable predictions of the effective stiffness and damping of the joint as a function of loading. A method proposed by Festjens, Chevallier and Dion addresses this by using a sort of nonlinear modal analysis based on the response of the structure to quasi-static loading. This was further developed by Allen and Lacayo and thoroughly demonstrated for structures with discrete Iwan joints. This work explores the efficacy of quasi-static modal analysis for 2D and 3D finite element models in which the geometry, contact pressure and friction in the joint are modeled in detail. The mesh density, contact laws, and other solver settings are explored to understand what is needed to obtain convergence for this type of problem. For the 2D case study, the effect of bolt preload and coefficient of friction are explored and shown to produce reasonable trends. Three dimensional models prove far more challenging and significant effort was required to obtain convergence and then to obtain results that are physically realistic; these efforts are reported as well as the lessons learned.

Plastic replicas as three-dimensional models of pulps

1975 ◽  
Vol 39 (8) ◽  
pp. 544-546
Author(s):  
HL Wakkerman ◽  
GS The ◽  
AJ Spanauf
Keyword(s):  
Three Dimensional ◽  
Dimensional Models ◽  
Three Dimensional Models
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