scholarly journals Tunnel Monitoring and Measuring System Using Mobile Laser Scanning: Design and Deployment

2020 ◽  
Vol 12 (4) ◽  
pp. 730 ◽  
Author(s):  
Haili Sun ◽  
Zhengwen Xu ◽  
Lianbi Yao ◽  
Ruofei Zhong ◽  
Liming Du ◽  
...  
Keyword(s):  
Laser Scanning ◽  
Development Trend ◽  
Image Resolution ◽  
Measuring System ◽  
Deformation Analysis ◽  
Disease Detection ◽  
Environmental Disease ◽  
The Common ◽  
Tunnel Monitoring ◽  
The Development Trend

The common statistical methods for rail tunnel deformation and disease detection usually require a large amount of equipment and manpower to achieve full section detection, which are time consuming and inefficient. The development trend in the industry is to use laser scanning for full section detection. In this paper, a design scheme for a tunnel monitoring and measuring system with laser scanning as the main sensor for tunnel environmental disease and deformation analysis is proposed. The system provides functions such as tunnel point cloud collection, section deformation analysis, dislocation analysis, disease extraction, tunnel and track image generation, roaming video generation, etc. Field engineering indicated that the repeatability of the convergence diameter detection of the system can reach ±2 mm, dislocation repeatability can reach ±3 mm, the image resolution is about 0.5 mm/pixel in the ballast part, and the resolution of the inner wall of the tunnel is about 1.5 mm/pixel. The system can include human–computer interaction to extract and label diseases or appurtenances and support the generation of thematic disease maps. The developed system can provide important technical support for deformation and disease detection of rail transit tunnels.

Development and Application on Ultrahigh Speed Grinding Processing Technology

2014 ◽  
Vol 509 ◽  
pp. 56-60
Author(s):  
Jian Yang
Keyword(s):  
Surface Roughness ◽  
Development Trend ◽  
Processing Technology ◽  
Processing Quality ◽  
Precision Grinding ◽  
Hard Materials ◽  
The Common ◽  
Grinding Efficiency ◽  
The Development Trend

Ultrahigh speed grinding technology is an advanced processing technology, which chould improve grinding efficiency, reduce surface roughness and improve processing quality. This paper introduces the origin of ultrahigh speed grinding processing technology, the development situation of ultrahigh speed grinding, summarizes its advantages comparing with the common grinding, analyzes the application on efficiency deep grinding, ultrahigh speed precision grinding, grinding hard materials grinding, grinding green and so on. And then it expounds the development trend of the ultrahigh speed grinding.

scholarly journals Cross-Section Deformation Analysis and Visualization of Shield Tunnel Based on Mobile Tunnel Monitoring System

Sensors ◽  
2020 ◽  
Vol 20 (4) ◽  
pp. 1006 ◽  
Author(s):  
Haili Sun ◽  
Shuang Liu ◽  
Ruofei Zhong ◽  
Liming Du
Keyword(s):  
Data Acquisition ◽  
Monitoring System ◽  
Point Cloud ◽  
Laser Scanning ◽  
Local Deformation ◽  
Shield Tunnel ◽  
Deformation Analysis ◽  
Point Cloud Data ◽  
Cloud Data ◽  
Tunnel Monitoring

With the ongoing developments in laser scanning technology, applications for describing tunnel deformation using rich point cloud data have become a significant topic of investigation. This study describes the independently developed a mobile tunnel monitoring system called the second version of Tunnel Scan developed by Capital Normal University (CNU-TS-2) for data acquisition, which has an electric system to control its forward speed and is compatible with various laser scanners such as the Faro and Leica models. A comparison with corresponding data acquired by total station data demonstrates that the data collected by CNU-TS-2 is accurate. Following data acquisition, the overall and local deformation of the tunnel is determined by denoising and 360° deformation analysis of the point cloud data. To enhance the expression of the analysis results, this study proposes an expansion of the tunnel point cloud data into a two-dimensional image via cylindrical projection, followed by an expression of the tunnel deformation through color difference to visualize the deformation. Compared with the three-dimensional modeling method of visualization, this method is easier to implement and facilitates storage. In addition, it is conducive to the performance of comprehensive analysis of problems such as water leakage in the tunnel, thereby achieving the effect of multiple uses for a single image.

scholarly journals A study on the improvement of the future branch system

2021 ◽  
Vol 4 (3) ◽  
pp. 1-19
Author(s):  
Yongsik Park
Keyword(s):  
Air Force ◽  
Transition Process ◽  
Development Trend ◽  
Artificial Satellites ◽  
Weapon Systems ◽  
Branch System ◽  
The Future ◽  
The Common ◽  
Multiple Domains ◽  
The Development Trend

This study aims to suggest an improvement plan for the army branch system considering the development trend of weapon systems through a case analysis of the vision and major weapon systems for each army branch system in R.O.K army. In the future, with the development of science and technology, hyper-connected networks based on artificial satellites would be built, and mosaic warfare, which integrates multiple domains simultaneously, and weapon systems capable of performing all-weather multifunctional battles across land, sea, and air would emerge. As a result, the common areas of the Army, Navy, and Air Force would be expanded, and the division of each army or branch itself would become ambiguous. Hence, it will be inevitable to move away from the branch operation concepts that have been operational until now to seek the concept of jointness or integration. To study this phenomenon, based on the Korean Army Vision 2050 published by the Army, the transition process of the current Army branch system and the cases of vision and major weapon systems for each branch were analyzed. The results of the analysis confirmed that although new advanced complex weapon systems are being developed for each branch, relatively little change has been made to the system. In particular, with the advent of hybrid drones and intelligent autonomous combat robots that can simultaneously perform ‘Surveillance, Reconnaissance - Decision – Strike’, it is expected that the area of expansion and mutual redundancy of combat functions will be further deepened. Therefore, in connection with the development of the weapon system, we will seek a solution to improve the Army branch system in the future and clarify the implications for the Navy and Air Force in the future.

scholarly journals Nutritional and Rheological Features of Lentil Protein Isolate for Yoghurt-Like Application

Foods ◽  
2021 ◽  
Vol 10 (8) ◽  
pp. 1692
Author(s):  
Theresa Boeck ◽  
Emanuele Zannini ◽  
Aylin W. Sahin ◽  
Juergen Bez ◽  
Elke K. Arendt
Keyword(s):  
Laser Scanning ◽  
Base Material ◽  
Small Deformation ◽  
Protein Isolate ◽  
Protein Supplementation ◽  
Water Holding Capacity ◽  
Laser Scanning Microscopy ◽  
Confocal Laser ◽  
Deformation Analysis ◽  
Water Holding

The substitution of animal protein with proteins of plant origin is a viable way to decrease the negative impact caused by animal husbandry on the environment. Pulse consumption has been widely promoted as a nutritious contribution to protein supplementation. In this study, an emulsion of lentil (Lens culinaris) protein isolate is fermented with lactic acid bacteria (LAB) to manufacture a yoghurt alternative and the techno-functional properties compared to a dairy- and a soy-based product with similar protein contents. The yoghurt-like products are subjected to large and small deformation analysis, quantification of fermentable oligosaccharides, disaccharides, monosaccharides and polyols (FODMAP), water holding capacity tests, protein profile analysis and the gel structure is visualised by confocal laser scanning microscopy (CLSM). The lentil yoghurt alternative shows good water holding capacity, high firmness and consistency values in large deformation analysis, with cohesiveness and viscosity not significantly different from that of dairy yoghurt. The high gel strength and rigidity of the lentil yoghurt gels measured by small deformation analysis is well-reflected in the dense protein matrix in the CLSM graphs. FODMAP content of the lentil yoghurt is very low, making it suitable for consumption by irritable bowel syndrome (IBS) patients. Our results show that lentil protein isolate is an excellent base material for producing a plant-based yoghurt alternative.

scholarly journals The development trend of AC-style PDPs

1998 ◽  
Vol 82 (Appendix) ◽  
pp. 311-311
Author(s):  
Tetsuji Okajima ◽  
Chizuka Tani
Keyword(s):  
Development Trend ◽  
The Development Trend

scholarly journals Experimental Study on Wake Evolution of a 1.5 MW Wind Turbine in a Complex Terrain Wind Farm Based on LiDAR Measurements

2020 ◽  
Vol 12 (6) ◽  
pp. 2467 ◽  
Author(s):  
Fei Zhao ◽  
Yihan Gao ◽  
Tengyuan Wang ◽  
Jinsha Yuan ◽  
Xiaoxia Gao
Keyword(s):  
Wind Speed ◽  
Wind Shear ◽  
Wind Farm ◽  
Wind Farms ◽  
Field Measurements ◽  
Development Trend ◽  
Asymmetric Distribution ◽  
Lidar Measurements ◽  
Wind Characteristics ◽  
The Development Trend

To study the wake development characteristics of wind farms in complex terrains, two different types of Light Detection and Ranging (LiDAR) were used to conduct the field measurements in a mountain wind farm in Hebei Province, China. Under two different incoming wake conditions, the influence of wind shear, terrain and incoming wind characteristics on the development trend of wake was analyzed. The results showed that the existence of wind shear effect causes asymmetric distribution of wind speed in the wake region. The relief of the terrain behind the turbine indicated a subsidence of the wake centerline, which had a linear relationship with the topography altitudes. The wake recovery rates were calculated, which comprehensively validated the conclusion that the wake recovery rate is determined by both the incoming wind turbulence intensity in the wake and the magnitude of the wind speed.

Application of Ubiquitous Sensor Network in Collection and Analysis of CNC Machine Tool Processing Status Information

2010 ◽  
Vol 455 ◽  
pp. 621-624
Author(s):  
X. Li ◽  
Y.Y. Yu
Keyword(s):  
Machine Tool ◽  
Sensor Network ◽  
Machine Tools ◽  
Thermal Error ◽  
Development Trend ◽  
Cnc Machine Tools ◽  
Cnc Machine Tool ◽  
Cnc Machine ◽  
Status Information ◽  
The Development Trend

Because of the practical requirement of real-time collection and analysis of CNC machine tool processing status information, we discuss the necessity and feasibility of applying ubiquitous sensor network(USN) in CNC machine tools by analyzing the characteristics of ubiquitous sensor network and the development trend of CNC machine tools, and application of machine tool thermal error compensation based on USN is presented.

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