scholarly journals RESEARCH AND IMPLEMENTATION OF 3D CITY BATCH RAPID MODELLING METHOD

2020 ◽  
Vol XLII-3/W10 ◽  
pp. 1107-1112
Author(s):  
P. G. Cheng ◽  
A. L. He ◽  
Y. J. Nie ◽  
J. Wu ◽  
X. L. Li ◽  
...  
Keyword(s):  
3D Models ◽  
Parametric Modelling ◽  
The Road ◽  
Roof Structure ◽  
Modelling Method ◽  
Attribute Information ◽  
Low Efficiency ◽  
And Performance ◽  
2D Data ◽  
Batch Modelling

Abstract. For the current 3D city modelling, the use of computer programs for batch modelling of non-fine models can only ensure the building height information, and cannot effectively use the attribute information of 2D data; and the manual modelling method for the road ancillary facilities has the disadvantages of modelling and placement of streetlamps, low efficiency, and inaccurate positions, a 3D modelling method based on parametric modelling technology and 3DMax modelling technology to realize batch modelling of non-fine buildings and urban streetlamps was proposed. Firstly, the spatial and attribute information of two-dimensional surveying data is used as basic data; then, through the geometric functions provided by CityEngine, combined with the characteristics of the main building and roof structure of the village in the city, the functions of generating the building structure is constructed, and the batch-based automatic modelling is compiled. The program uses the bottom attribute information to control the structure and texture of the model. . The external model was introduced through geometric function, use the attribute information and the adjacent angle of the road centerline to control the style, size and direction of the streetlamp, realize the batch automatic construction at the streetlamp coordinate point. Finally, the Python language bulk export model plug-in and a MaxScript script bulk import model plugin are compiled to improve work efficiency and model compatibility. Through experiments and performance analysis, it is shown that the method can guarantee the rapid establishment of 3D models of buildings and streetlamps, and the structure and texture are vivid. It is well compatible with 3DMax and can be directly modified and format converted.

Automatic Parametric Modeling From Non-Feature Based Designs for Additive Manufacturing

2021 ◽  
Author(s):  
Xinyi Xiao ◽  
Byeong-Min Roh
Keyword(s):  
Additive Manufacturing ◽  
3D Models ◽  
Parametric Modeling ◽  
Parametric Models ◽  
Performance Simulation ◽  
Cad Modeling ◽  
3D Cad ◽  
Feature Based ◽  
And Performance ◽  
The Given

Abstract The integration of Topology optimization (TO) and Generative Design (GD) with additive manufacturing (AM) is becoming advent methods to lightweight parts while maintaining performance under the same loading conditions. However, these models from TO or GD are not in a form that they can be easily edited in a 3D CAD modeling system. These geometries are generally in a form with no surface/plane information, thus having non-editable features. Direct fabricate these non-feature-based designs and their inherent characteristics would lead to non-desired part qualities in terms of shape, GD&T, and mechanical properties. Current commercial software always requires a significant amount of manual work by experienced CAD users to generate a feature-based CAD model from non-feature-based designs for AM and performance simulation. This paper presents fully automated shaping algorithms for building parametric feature-based 3D models from non-feature-based designs for AM. Starting from automatically decomposing the given geometry into “formable” volumes, which is defined as a sweeping feature in the CAD modeling system, each decomposed volume will be described with 2D profiles and sweeping directions for modeling. The Boolean of modeled components will be the final parametric shape. The volumetric difference between the final parametric form and the original geometry is also provided to prove the effectiveness and efficiency of this automatic shaping methodology. Besides, the performance of the parametric models is being simulated to testify the functionality.

scholarly journals Modeling of Hypervelocity Impact Experiments Using Gamma-SPH Technique

2017 ◽  
Author(s):  
Jérôme Limido ◽  
Mohamed Trabia ◽  
Shawoon Roy ◽  
Brendan O’Toole ◽  
Richard Jennings ◽  
...  
Keyword(s):  
Computation Time ◽  
3D Models ◽  
Hypervelocity Impact ◽  
Side Impact ◽  
Particle Methods ◽  
Computational Time ◽  
Back Surface ◽  
Tensile Instability ◽  
Particle Hydrodynamics ◽  
And Performance

A series of experiments were performed to study plastic deformation of metallic plates under hypervelocity impact at the University of Nevada, Las Vegas (UNLV) Center for Materials and Structures using a two-stage light gas gun. In these experiments, cylindrical Lexan projectiles were fired at A36 steel target plates with velocities range of 4.5–6.0 km/s. Experiments were designed to produce a front side impact crater and a permanent bulging deformation on the back surface of the target without inducing complete perforation of the plates. Free surface velocities from the back surface of target plate were measured using the newly developed Multiplexed Photonic Doppler Velocimetry (MPDV) system. To simulate the experiments, a Lagrangian-based smooth particle hydrodynamics (SPH) is typically used to avoid the problems associated with mesh instability. Despite their intrinsic capability for simulation of violent impacts, particle methods have a few drawbacks that may considerably affect their accuracy and performance including, lack of interpolation completeness, tensile instability, and existence of spurious pressure. Moreover, computational time is also a strong limitation that often necessitates the use of reduced 2D axisymmetric models. To address these shortcomings, IMPETUS Afea Solver® implemented a newly developed SPH formulation that can solve the problems regarding spurious pressures and tensile instability. The algorithm takes full advantage of GPU Technology for parallelization of the computation and opens the door for running large 3D models (20,000,000 particles). The combination of accurate algorithms and drastically reduced computation time now makes it possible to run a high fidelity hypervelocity impact model.

scholarly journals Studying the Effects of Roads Geometry and Design Parameters on the Pavement Drainage System

2021 ◽  
Vol 7 (1) ◽  
pp. 49-58
Author(s):  
Mohammad Awwad
Keyword(s):  
Positive Impact ◽  
Drainage System ◽  
Road Construction ◽  
Design Parameters ◽  
Water Flow Velocity ◽  
The Road ◽  
Drainage Time ◽  
Operations And Maintenance ◽  
And Performance ◽  
Good Drainage

Background: Water floods have a considerable impact on roads sustainability by creating roads cracks, breaking down and holes, and failure for some other parts. The existence of good drainage system serviced the road and draining the water resulted from rain floods is crucial. These significant influences can be classified as positive or negative, low, moderate, or high. Aim and Objectives: This paper discusses the water floods and rainfall effects on roads and highways in Jordan as well as the drainage system on road sustainability and performance. The main aim of this paper is to investigate and analyse water as rainfall or floods affecting roads and highways in Jordan. The importance of this study is represented by studying and analysing the effects of rainfall and water floods on road construction and sustainability in Jordan after the latest high rain sizes of this winter and water floods, which affect the roads and highways in a good percentage. The other importance of the study is represented in offering solutions to problems caused by the environmental effects, specially floods and high rainfall rates. Methodology: all data and information about status of Jordanian roads during winter and floods are collected from real cases of about 40 main and semi-main roads in Jordan.  Results and Conclusions: A good drainage system and repair operations and maintenance generally have a positive impact on road sustainability and survival age. The effects of slopes of the road and surface of the asphalt, rainfall intensity, and water flow velocity on drainage length and drainage time and water depth are discussed here. Doi: 10.28991/cej-2021-03091636 Full Text: PDF

scholarly journals The Registry as a Basis for Epidemiological Surveillance and Optimization of Care in Out-of-hospital Cardiac Arrest

2018 ◽  
Vol 7 (3) ◽  
pp. 234-243 ◽  
Author(s):  
A. A. Birkun ◽  
A. V. Altukhov
Keyword(s):  
Epidemiological Data ◽  
Epidemiological Studies ◽  
Wide Distribution ◽  
General Concept ◽  
Epidemiological Surveillance ◽  
Low Efficiency ◽  
Low Incidence ◽  
And Performance ◽  
Main Instrument ◽  
Hospital Cardiac Arrest

Despite significant progress in medicine, out-of-hospital cardiac (OHCA) remains one of the leading causes of death around the world. Epidemiological data suggest wide distribution of OHCA, low incidence of cardiopulmonary resuscitation attempts and low efficiency of resuscitation in the Russian Federation. Both implementation of measures for reducing mortality from OHCA and monitoring of their efficiency should be based on up-to-date, reliable data on national and regional OHCA epidemiology and performance of emergency medical services. The aim of this review is to provide a rationale for establishment of the national OHCA registry as a main instrument of collection, arrangement, storage, processing and presentation of data on OHCA epidemiology and efficiency of care provided. The review includes the analysis of OHCA epidemiological studies carried out in Russia, describes general concept and international experience of developing OHCA registries, and discusses Utstein guidelines for uniform reporting of OHCA data.

scholarly journals Internet of Things-based Smart Street System

2021 ◽  
Vol 11 (4) ◽  
pp. 5577-5594
Author(s):  
Chandla Ellis ◽  
Tirumala Raju Vineetha ◽  
Segu Sravana Keerthi ◽  
S.P. Kalpana ◽  
R. Roshni Karen
Keyword(s):  
Urban Areas ◽  
Piezoelectric Sensor ◽  
Electrical Energy ◽  
Huge Amount ◽  
Street Lighting ◽  
The Road ◽  
Turn On ◽  
Enormous Amount ◽  
Low Efficiency ◽  
Green Solution

Enormous amount of electrical energy is consumed in urban areas by means of street lights. Currently, the street lights are turned on and off manually which will lead to wastage of electrical energy. Due to inadequate dimming and low efficiency of lights, current is being wasted. The main aim of this smart LED system is to create a street light which will behave according to its surrounding. This LED will turn on automatically during dark time and off during bright time with the help of LDR. It will remain dim when there is no one near the light and turns on bright when people pass by it. By doing this, huge amount of energy is being saved. Though solar energy is efficient, it can’t work during rainy season. Thus, piezoelectric sensor is a good replacement of it. It converts the pressure that applied on it to electrical energy. This sensor is fixed in the road which will convert the pressure applied to it by the vehicles to electrical energy which can be utilized by the LEDs. Finally, this system aims to present an overview of a profitable and green solution to the energy consumption problem imposed by street lighting.

scholarly journals Application of Multinomial Regression Model to Identify Parameters Impacting Traffic Barrier Crash Severity

2019 ◽  
Vol 13 (1) ◽  
pp. 57-64
Author(s):  
Mahdi Rezapour ◽  
Amirarsalan Mehrara Molan ◽  
Khaled Ksaibati
Keyword(s):  
Regression Model ◽  
Multinomial Logistic Regression ◽  
Crash Severity ◽  
Multinomial Regression ◽  
Interstate Highways ◽  
The Road ◽  
Run Off ◽  
Multinomial Regression Model ◽  
Proportional Odds Assumption ◽  
And Performance

Background: Run Off The Road (ROTR) crashes are some of the most severe crashes that could occur on roadways. The main countermeasure that can be taken to address this type of crashe is traffic barrier installation. Although ROTR crashes can be mitigated significantly by traffic barriers, still traffic barrier crashes resulted in considerable amount of severe crashes. Besides, the types of traffic barriers, driver actions and performance play an important role in the severity of these crashes. Methods: This study was conducted by incorporating only traffic barrier crashes in Wyoming. Based on the literature review there are unique contributory factors in different crash types. Therefore, in addition to focusing on traffic barrier crashes, crashes were divided into two different highway classes: interstate and non-interstate highways. Results: The result of proportional odds assumption was an indication that multinomial logistic regression model is appropriate for both non-interstate and interstates crashes involved with traffic barriers. The results indicated that road surface conditions, age, driver restraint and negotiating a curve were some of the factors that impact the severity of traffic barrier crashes on non-interstate highways. On the other hand, the results of interstate barrier crashes indicated that besides types of barriers, driver condition, citation record, speed limit compliance were some of the factors that impacted the interstate traffic barrier crash severity. Conclusion: The results of this study would provide the policymakers with the directions to take appropriate countermeasures to alleviate the severity of traffic barrier crashes.

scholarly journals Development and Performance Testing of Solar Operated Insecticide and Pesticide Agro Spraying System

2019 ◽  
Vol 9 (1) ◽  
pp. 573-578
Keyword(s):  
Low Cost ◽  
Labour Productivity ◽  
Operating Time ◽  
Performance Testing ◽  
Maintenance Cost ◽  
Pump Efficiency ◽  
Agricultural Field ◽  
Low Efficiency ◽  
And Performance ◽  
Solar Powered

This paper represents the development and performance analysis of Solar operated Spraying system. Generally in the agricultural field, traditional conventional techniques like hand operated and fuel operated sprayer system for spraying pesticides have been used which is not eco-friendly, less labour productivity and low efficiency. These tools uses diesel as fuels which is harmful for the environment and also do increases the operating and maintenance cost. This motivates us to design and fabricate real-time product which is operated by solar energy. The main objective of this research is to design and fabricate the solar powered agricultural pesticide sprayer by considering parameters like desired spraying capacity, low weight, low cost, user-friendly nature, high operating time and for faster coverage of area. Mathematical models were developed after adopting suitable assumptions for calculation of power of the motor and sizing of battery, charge controller, solar panel required for spraying a known quantity of fluid. The parts required for the system had been selected by solving for known inputs values and considering their availability in the market. The maximum discharge at outlet of DC Pump, efficiency of pump had been calculated by taking different discharge at outlet of the pump. Further by using 12 Volt Led light, it can be operated in night mode and also is to reduce back pain of human being by keeping the tank in backside.

Swiss Data Models for Geology: from 2D Data Towards Geological 3D Models

2013 ◽  
pp. 831-834
Author(s):  
Cristina Salomè Michael ◽  
Nils Oesterling ◽  
Stefan Strasky ◽  
Roland Baumberger
Keyword(s):  
3D Models ◽  
Data Models ◽  
2D Data

Use of Hydrogen and Fuel Cells for Refrigerated Transport

2015 ◽  
pp. 881-924
Author(s):  
Raquel Garde ◽  
Sindia Casado ◽  
Fernando Jimenez ◽  
Gabriel Garcia-Naveda ◽  
Monica Aguado
Keyword(s):  
Fuel Cells ◽  
Refrigeration System ◽  
Road Transportation ◽  
Performance Simulation ◽  
The Road ◽  
Operation Costs ◽  
Transportation Sector ◽  
Refrigerated Transport ◽  
Reduced Costs ◽  
And Performance

Benchmark refrigeration systems in the road transportation sector are powered by diesel, having operation costs of up to 6,000 €/y with the consequent increase of the goods cost. This chapter presents an alternative refrigeration system based on fuel cells (FC) and hydrogen as fuel, with higher efficiency, reduced costs and independent of diesel price fluctuations. Examples of the energy load profiles impact on the FC sizing, H2 consumption and system autonomy are presented as well as a description of the FC model and performance simulation results. The economical feasibility of this new refrigeration system linked to renewable energies is also analyzed and an economical assessment for different scenarios is presented.

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