Fast and Realistic Reflections Using Screen Space and GPU Ray Tracing—A Case Study on Rigid and Deformable Body Simulations

2018 ◽  
Vol 16 (4) ◽  
pp. 1-18
Author(s):  
Daniel Valente De Macedo ◽  
Ygor Rebouças Serpa ◽  
Maria Andréia Formico Rodrigues
Keyword(s):  
Ray Tracing ◽  
Deformable Body ◽  
Screen Space

scholarly journals Characterisation of Indoor Massive MIMO Channels Using Ray-Tracing: A Case Study in the 3.2–4.0 GHz 5G Band

Electronics ◽  
2020 ◽  
Vol 9 (8) ◽  
pp. 1250
Author(s):  
Luis Valle ◽  
Jesús R. Pérez ◽  
Rafael P. Torres
Keyword(s):  
Ray Tracing ◽  
Massive Mimo ◽  
Base Station ◽  
Ofdm System ◽  
Mimo Channels ◽  
5G Systems ◽  
Target Environment ◽  
Temporal Dispersion ◽  
Measurement Campaigns

In this paper, research results on the applicability of ray-tracing (RT) techniques to model massive MIMO (MaMi) channels are presented and discussed. The main goal is to show the possibilities that site-specific models based on rigorous RT techniques, along with measurement campaigns considered for verification or calibration purposes where appropriate, can contribute to the development and deployment of 5G systems and beyond using the MaMi technique. For this purpose, starting from the measurements and verification of the simulator in a symmetric, rectangular and accessible scenario used as the testbed, the analysis of a specific case involving channel characterisation in a large, difficult access and measurement scenario was carried out using the simulation tool. Both the measurement system and the simulations emulated the up-link in an indoor cell in the framework of a MaMi-TDD-OFDM system, considering that the base station was equipped with an array consisting of 10 × 10 antennas. The comparison of the simulations with the measurements in the testbed environment allowed us to affirm that the accuracy of the simulator was high, both for determining the parameters of temporal dispersion and frequency selectivity, and for assessing the expected capacity in a specific environment. The subsequent analysis of the target environment showed the high capacities that a MaMi system can achieve in indoor picocells with a relatively high number of simultaneously active users.

Visibility Analysis for Assembly Fixture Calibration Using Screen Space Transformation

2003 ◽  
Author(s):  
Zhenyu Kong ◽  
Wenzhen Huang ◽  
Dariusz Ceglarek
Keyword(s):  
Visibility Analysis ◽  
Space Transformation ◽  
Significant Burden ◽  
New Type ◽  
Quality Of Products ◽  
Screen Space ◽  
Calibration Time ◽  
Assembly Fixture

In a number of manufacturing processes, tooling installation, calibration and maintenance guarantee the precision of fixtures and play important roles towards the overall quality of products. Recently a new type of measurement equipment called “laser tracker” was developed and utilized for assembly fixture calibration to shorten calibration time and improve the accuracy of the currently used theodolite systems. Though, the calibration of assembly fixture is critical for product quality, the calibration time creates significant burden for productivity of multi-station assembly processes. In order to shorten the calibration lead time, the number of necessary calibration setups which is determined by visibility analysis needs to be minimized. This paper presents a screen space transformation based visibility analysis that allows minimizing the number of setups. The screen space transformation is applied to transform the visibility problem from 3D to 2D space, consequently the visibility problem can be solved efficiently. A case study illustrates the procedure and verifies the validity of the proposed methodology.

Parry arc: a polarization lidar, ray-tracing, and aircraft case study

2000 ◽  
Vol 39 (36) ◽  
pp. 6738 ◽  
Author(s):  
Kenneth Sassen ◽  
Yoshihide Takano
Keyword(s):  
Ray Tracing

Application of the X-ray tracing method to powder diffraction line profiles

2008 ◽  
Vol 41 (1) ◽  
pp. 153-160 ◽  
Author(s):  
Sébastien Lambert ◽  
François Guillet
Keyword(s):  
Ray Tracing ◽  
Interesting Case ◽  
Detector Response ◽  
Instrument Function ◽  
Laboratory Equipment ◽  
X Ray ◽  
Dynamic Diffraction ◽  
Position Sensitive ◽  
Good Agreement

An X-ray tracing program was developed to simulate the instrument function of a high-resolution X-ray powder diffractometer. The optics of this laboratory instrument consist of a conventional X-ray tube, a single flat Ge monochromator, slits, the powder sample and finally a curved position-sensitive detector. Such a setup provides an interesting case study in order to assess X-ray tracing, which has seldom been used in the case of laboratory equipment. The simulation reported in this paper covers different aspects of optics simulation, ranging from straightforward kinematic diffraction to dynamic diffraction by single crystals or learned detector response function. The comparison between the simulation and the profiles measured using the NIST line profile standard SRM 660a LaB6shows a good agreement. This result provides the basis for discussing the opportunity of using X-ray tracing in diagram-refinement software.

scholarly journals Redirection of Lamb Waves for Structural Health Monitoring

2012 ◽  
Vol 2012 ◽  
pp. 1-9 ◽  
Author(s):  
W. H. Ong ◽  
W. K. Chiu
Keyword(s):  
Structural Health Monitoring ◽  
Ray Tracing ◽  
Health Monitoring ◽  
Lamb Wave ◽  
Lamb Waves ◽  
Design Stage ◽  
Structural Health ◽  
Critical Location ◽  
Potential Use

Currently, structures are designed without structural health monitoring (SHM) in mind. It is proposed that SHM should be addressed at the design stage of new structures. This paper explores the benefit which can be gained from such considerations. The scope encompasses Lamb-wave-based SHM and a given fatigue critical location (FCL). Optimization is performed using specialised ray tracing. A case study is carried out using a specimen that simulates a hard-to-inspect region in a fuel vent hole in wings structures of aircraft. This work will report on the potential use of the focussing of stress wave to improve detectability of defect in this hard-to-inspect location. Following optimization, results are produced numerically and experimentally. The results revealed sensitivity to damage is nearly doubled while minimum detectable damage size is significantly decreased. As a result, this study brings together an assortment of specialised tools to form a workflow ready for implementation.

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