scholarly journals Vertical oscillation investigation of spatially elastically supported rigid plate – vehicle model

2019 ◽  
Vol 254 ◽  
pp. 03010 ◽  
Author(s):  
Blanka Skočilasová ◽  
Jan Skočilas ◽  
František Klimenda ◽  
Josef Soukup ◽  
Marian Handrik
Keyword(s):  
3D Model ◽  
Vertical Displacement ◽  
General Point ◽  
Vertical Oscillation ◽  
Vehicle Model ◽  
Advantages And Disadvantages ◽  
Experimental Part ◽  
Elastically Supported ◽  
Railroad Vehicle ◽  
Oscillation Investigation

The article deals with introduction into the issue of the general asymmetry under vertical oscillation of systems of spatially elastically supported bodies with context of vehicle application. The various models are mentioned, quarter, half and full model (with different DOF) and advantages and disadvantages are discussed. The basic calculation procedures were presented for symmetry and asymmetry of geometry and excitation. The excitation is produced by jump change of plate support (analytically and numerically solved by Heaviside’s function, in the experimental part by jump down from the wedges). The procedure to solve the basic 3D model is introduced for selected types of asymmetry of geometry and excitation. The practical approach is presented on the two-axle railroad vehicle. The vertical displacement, velocities, accelerations and angles of rotation of symmetry axes are considered. The time trend of the vertical displacement of the general point the aim of the calculation (3 DOF considered).

scholarly journals DOCUMENTATION OF HISTORICAL UNDERGROUND OBJECT IN SKORKOV VILLAGE WITH SELECTED MEASURING METHODS, DATA ANALYSIS AND VISUALIZATION

2016 ◽  
Vol XLI-B5 ◽  
pp. 251-254
Author(s):  
A. Dlesk
Keyword(s):  
Laser Scanning ◽  
3D Model ◽  
Local Development ◽  
Radar Data ◽  
Surface Model ◽  
Measuring Methods ◽  
Advantages And Disadvantages ◽  
Remotely Piloted Aircraft ◽  
Historical Objects ◽  
Aircraft System

The author analyzes current methods of 3D documentation of historical tunnels in Skorkov village, which lies at the Jizera river, approximately 30 km away from Prague. The area is known as a former military camp from Thirty Years’ War in 17th Century. There is an extensive underground compound with one entrance corridor and two transverse, situated approximately 2 to 5 m under the local development. The object has been partly documented by geodetic polar method, intersection photogrammetry, image-based modelling and laser scanning. Data have been analyzed and methods have been compared. Then the 3D model of object has been created and compound with cadastral data, orthophoto, historical maps and digital surface model which was made by photogrammetric method using remotely piloted aircraft system. Then the measuring has been realized with ground penetrating radar. Data have been analyzed and the result compared with real status. All the data have been combined and visualized into one 3D model. Finally, the discussion about advantages and disadvantages of used measuring methods has been livened up. The tested methodology has been also used for other documentation of historical objects in this area. This project has been created as a part of research at EuroGV. s.r.o. Company lead by Ing. Karel Vach CSc. in cooperation with prof. Dr. Ing. Karel Pavelka from Czech Technical University in Prague and Miloš Gavenda, the renovator.

scholarly journals ANALYSIS OF POSSIBILITIES OF LOW-COST PHOTOGRAMMETRY FOR INTERIOR MAPPING

2019 ◽  
Vol XLII-5/W3 ◽  
pp. 27-31
Author(s):  
A. Dlesk ◽  
K. Vach ◽  
P. Holubec
Keyword(s):  
Point Cloud ◽  
Laser Scanning ◽  
3D Model ◽  
Low Cost ◽  
Digital Camera ◽  
3D Modelling ◽  
Light Conditions ◽  
Advantages And Disadvantages ◽  
Lower Light ◽  
High Level

Abstract. This paper shows the possibilities of using low-cost photogrammetry for interior mapping as a tool to gather fast and accurate data for 3D modelling and BIM. To create a 3D model of a building interior with a high level of detail requires techniques such as laser scanning and photogrammetry. In the case of photogrammetry, it is possible to use standard cameras and SfM software to create an accurate point cloud which can be used for 3D modelling and then for BIM. The images captured indoor are often captured under lower light conditions. Using different exposure during capturing of images of building interior was tested. Frequent plain walls of a building interior cause that the images are usually lack of any features and their photogrammetric processing is getting much more difficult. In some cases, results of photogrammetric processing are poor and inaccurate. In this paper, an experiment of creating a 3D model of a building interior using photogrammetric processing of images was carried out. For this experiment digital camera with two different lenses (16 mm lens and fisheye lens) was used. For photogrammetric processing were chosen different software. All the results were compared to each other and to the laser scanning data of the interior. At the end of the paper, the discussion of the advantages and disadvantages of the shown method has been made.

scholarly journals Mechanical Advantages and Disadvantages of a Lower Limb Using Forefoot to Heel Strike Landing

Proceedings ◽  
2020 ◽  
Vol 49 (1) ◽  
pp. 15
Author(s):  
Takayuki Koike ◽  
Norimasa Yamada
Keyword(s):  
Stance Phase ◽  
Vertical Displacement ◽  
Heel Strike ◽  
Distance Runners ◽  
Flight Duration ◽  
Advantages And Disadvantages ◽  
Leg Stiffness ◽  
Foot Strike ◽  
Lower Height ◽  
Angular Displacements

A previous study reported that habitually barefoot Kenyan distance runners tend to use a mid-foot strike or a forefoot-heel strike (FHS). Current findings indicate FHS helps enhance Kenyans’ running performance. However, no study has investigated how FHS modulates leg stiffness (kleg) and altered running velocity with changes in kleg. Because vertical displacement of the centre of mass and kleg during hopping are applicable to the running process, this study investigated how FHS affects kleg and hopping frequency (fhopping) during hopping. Subjects hopped at 2.2 Hz with normal hopping (NH-2.2Hz) and at a comfortable frequency with FHS (FHS-CF). According to each subject’s comfortable frequency at FHS-CF, they were divided into higher (HG, 2.49 ± 0.11 Hz) and lower (LG, 2.16 ± 0.19 Hz) groups. With FHS-CF, the flight duration in HG was significantly shorter than that in LG. kleg in HG was greater than that in LG. Negative work in the first half of the stance phase and positive work in the second half of the stance phase at all three joints were smaller in HG than in LG. The touchdown angle was larger and angular displacements at the joints were smaller in HG than in LG. The findings indicate that when hoppers used FHS, they increased their preferred fhopping by stiffening their leg joints during the stance phase and jumping with a lower height than in normal hopping; additionally, it is important to increase the touchdown joint angle for a stiffened joint.

scholarly journals Characterization and Simulation of a Bush Plane Tire

Lubricants ◽  
2019 ◽  
Vol 7 (12) ◽  
pp. 107 ◽  
Author(s):  
Nadia Arif ◽  
Iulian Rosu ◽  
Hélène Lama Elias-Birembaux ◽  
Frédéric Lebon
Keyword(s):  
Numerical Simulation ◽  
3D Model ◽  
Element Model ◽  
Extreme Conditions ◽  
Lateral Stiffness ◽  
Efficient Tool ◽  
Experimental Part ◽  
Mesh Model ◽  
Numerical Finite Element ◽  
Embedded Mesh

This paper deals with a Bush plane tire rolling in critical and extreme conditions as shocks and rebounds. The approach adopted is based on previous works on the modelling of Jumbo-Jet tires. A numerical finite element model is used in the simulation of the tire. Firstly, an experimental part is dedicated to study the inner features of the tire. The tire geometry and the materials within it are described. Secondly, a 2D embedded mesh model is developed based on the tire cross-section. Then a 3D model is generated and a runway with rocks and ramps is modelled. The tire behavior while rolling over obstacles is investigated. The simulation results, such as tire deformation, are analyzed. The results show significant deformation of the tire while rolling over ramps and a low lateral stiffness, giving it a significant capacity to absorb shocks. The numerical simulation was developed in order to predict the tire behavior during landing, especially in critical and extreme conditions. Cornering simulations were realized to evaluate the self-aligning moment. The numerical simulation is an efficient tool to estimate the forces transferred to the rim axis in critical and extreme conditions.

scholarly journals A Conceptual Project of a Device for Human Wrist Functional Rehabilitation

2016 ◽  
Vol 21 (4) ◽  
pp. 923-932 ◽  
Author(s):  
B. Lewandowski ◽  
M. Olinski ◽  
S. Wudarczyk ◽  
A. Gronowicz
Keyword(s):  
Control System ◽  
Literature Review ◽  
3D Model ◽  
Functional Rehabilitation ◽  
Advantages And Disadvantages ◽  
Supporting Functional

Abstract In the paper, the problems of devices supporting functional rehabilitation of a human wrist were addressed. A literature review and a description of selected devices together with an indication of their advantages and disadvantages were conducted. The biomechanical structure of a human wrist was analyzed. On this basis and after taking into consideration ranges of motion of the selected joints the concept of a new mechanism was developed. A 3D model of the device was built in the Autodesk Inventor system. For the purpose of simulations another model was developed in the MSC Adams system. Issues of drives and sensors selection, as well as requirements for the control system, were examined.

scholarly journals Experimental and Numerical Investigations of the Influence of Real Cracks on Chloride Ingress in Concrete

2016 ◽  
Vol 16 (2) ◽  
pp. 151-160 ◽  
Author(s):  
Corina Sosdean ◽  
Liviu Marsavina ◽  
Geert De Schutter
Keyword(s):  
Steady State ◽  
3D Model ◽  
Concrete Slab ◽  
Chloride Ingress ◽  
Migration Test ◽  
Reinforced Concrete Slab ◽  
Cracked Concrete ◽  
Numerical Investigations ◽  
Experimental Part ◽  
Standard Software

Abstract Experimental and numerical results of a chloride ingress study conducted on samples drilled from different locations of a reinforced concrete slab, previously loaded until failure, are presented. The experimental part was carried on following the NT Build 492 standard for the non-steady state migration test, then a 3D model was developed using the Abaqus/Standard software based on the FEM in order to simulate chloride ingress in both uncracked and cracked concrete.

scholarly journals Assessment of the Capabilities of Commercial Tools to Develop 4D/5D Models

2019 ◽  
Vol 2018 (1) ◽  
Author(s):  
M. Yeşilyurt ◽  
E. Ergen
Keyword(s):  
Software Package ◽  
3D Model ◽  
Information Modeling ◽  
Test Case ◽  
Construction Sector ◽  
Advantages And Disadvantages ◽  
Software Packages ◽  
Simulation Based ◽  
Building Information ◽  
Modeling Software

Building Information Modeling (BIM), which is developed for improving the collaboration and interoperability in the construction sector has many dimensions. While “3D model” is developed to visualize the buildings, simulation-based “4D model” integrates 3D model with time and “5D model” is attained as a result of including cost in the 4D model. The purpose of this study is to define 5D modeling in detail and to assess the capacities of 4D/5D modeling software packages via comparison. To assess the capacities of 4D/5D modeling software packages, a test case was developed. A 3D model of a project was created in Autodesk Revit 2017 and 4D/5D models of the building were developed by using Autodesk Navisworks Manage 2017, Synchro Pro 2016.2 and Trimble Vico Office R6.0 software packages. In the test case, the stages and their durations when preparing 4D/5D models were identified and the advantages and disadvantages of each software package were determined. The results of the study could be used as a guide by the companies desiring to conduct 4D/5D application in the sector.

scholarly journals DOCUMENTATION OF HISTORICAL UNDERGROUND OBJECT IN SKORKOV VILLAGE WITH SELECTED MEASURING METHODS, DATA ANALYSIS AND VISUALIZATION

2016 ◽  
Vol XLI-B5 ◽  
pp. 251-254
Author(s):  
A. Dlesk
Keyword(s):  
Laser Scanning ◽  
3D Model ◽  
Local Development ◽  
Radar Data ◽  
Surface Model ◽  
Measuring Methods ◽  
Advantages And Disadvantages ◽  
Remotely Piloted Aircraft ◽  
Historical Objects ◽  
Aircraft System

The author analyzes current methods of 3D documentation of historical tunnels in Skorkov village, which lies at the Jizera river, approximately 30 km away from Prague. The area is known as a former military camp from Thirty Years’ War in 17th Century. There is an extensive underground compound with one entrance corridor and two transverse, situated approximately 2 to 5 m under the local development. The object has been partly documented by geodetic polar method, intersection photogrammetry, image-based modelling and laser scanning. Data have been analyzed and methods have been compared. Then the 3D model of object has been created and compound with cadastral data, orthophoto, historical maps and digital surface model which was made by photogrammetric method using remotely piloted aircraft system. Then the measuring has been realized with ground penetrating radar. Data have been analyzed and the result compared with real status. All the data have been combined and visualized into one 3D model. Finally, the discussion about advantages and disadvantages of used measuring methods has been livened up. The tested methodology has been also used for other documentation of historical objects in this area. This project has been created as a part of research at EuroGV. s.r.o. Company lead by Ing. Karel Vach CSc. in cooperation with prof. Dr. Ing. Karel Pavelka from Czech Technical University in Prague and Miloš Gavenda, the renovator.

418V Side Dump Car Introduction: Wall Opening Simulation and Further Research

2014 ◽  
Vol 1036 ◽  
pp. 614-618
Author(s):  
Andrzej Wróbel ◽  
Piotr Musiał ◽  
Aleksander Olszewski ◽  
Daria Bajda ◽  
Martyna Poręba
Keyword(s):  
Main Part ◽  
3D Model ◽  
Angular Displacement ◽  
Step Function ◽  
Motion Simulation ◽  
Simulation Research ◽  
Technical Data ◽  
Valuable Data ◽  
Advantages And Disadvantages ◽  
Technical Solutions

This article includes basic information about 418V dump car. It presents most important technical data and possible applications of the wagon. It also involves main advantages and disadvantages of implicated technical solutions. Main part refers to the wall opening simulation carried out using the Siemens NX 8.5 software [4,5]. Analysis of the behaviour of mechanisms allowed to examine stages of the opening process and delivered valuable data about angular displacement of the side-board. Siemens NX 8.5 software was used in order to conduct side-boards opening simulation. Research was based on existing 3D model of 418V dump car applied into Siemens Motion Simulation module. It involved dividing model into particular elements (‘Links’), defining movement relations between them (‘Joints’), setting up a STEP function and finally creating a new solution. Research resulted in a complex side-board opening simulation. It allowed to define an angular displacement of particular, important parts. Mechanisms were proven to work safely and without any collisions between elements. Outcome of this article may be used in further research referring to the 418V dump car.

3D Scanner, State of the Art

2011 ◽  
pp. 451-470 ◽  
Author(s):  
Francesco Bellocchio ◽  
Stefano Ferrari
Keyword(s):  
3D Model ◽  
State Of The Art ◽  
Physical Object ◽  
3D Scanner ◽  
Advantages And Disadvantages ◽  
Real Objects ◽  
3D Scanners ◽  
Geometrical Information ◽  
The Creation ◽  
Accuracy Speed

The digital models of real objects are used today in many fields: medicine, archeology, and entertainment are some examples of areas in which these models are applied. Generally, the first step of the creation of a real object’s 3D model consists in capturing the geometrical information of the physical object. Real objects can be small as coins or big as buildings: the different requirements have brought to the development of a very variegated set of techniques for the acquisition of geometrical information of the object. The aim of this chapter is to present and explain the techniques the 3D scanners are based on and compare them in terms of accuracy, speed, and applicability, in order to understand advantages and disadvantages of the different approaches.

Sign in / Sign up

Export Citation Format

Share Document