scholarly journals Development and engineering application of high-precision and multi-function simulation system for double reheat ultra-supercritical units

2019 ◽  
Vol 657 ◽  
pp. 012038
Author(s):  
B L Cai ◽  
H C Wang
Keyword(s):  
High Precision ◽  
Engineering Application ◽  
Simulation System

scholarly journals Research on Monitoring Method of Remote Deformation and System Application Based on Image

2021 ◽  
Vol 2021 ◽  
pp. 1-14
Author(s):  
Yu Zhang ◽  
Ruofei Zhong ◽  
Yongrong Li ◽  
Haili Sun
Keyword(s):  
Monitoring System ◽  
High Precision ◽  
Engineering Application ◽  
Deformation Monitoring ◽  
Image Feature ◽  
Deformation Analysis ◽  
Monitoring Cost ◽  
Scale Invariant ◽  
Monitoring Method ◽  
Reference Target

The development of information technology and computer science has put forward higher requirements on the intelligence of deformation monitoring. We study a method based on image deformation analysis, which uses Scale-Invariant Feature Transform (SIFT) to extract image feature points after preprocessing the acquired images, applies All-Pixels Matching (APM) method to the sequence images to do further high-precision matching to achieve the accuracy of subpixels, and finally solves the deformation variables according to the relationship of the real size of the reference target and its pixel. Wavelet analysis and least squares are used to improve the image quality and matching accuracy. Based on this method, we design and develop a new remotely automated deformation monitoring system. In this paper, we introduce the algorithm principle of deformation analysis, the integration of the system, and the engineering application example of the monitoring system. The monitoring accuracy of the system satisfying 0.1 mm within 10 m and 0.8 mm within 60 m is verified in the simultaneous comparison observation according to the high-precision total station, which illustrates the effectiveness of the present deformation analysis method and monitoring system and also has the characteristics of low monitoring cost and high degree of automation.

Research on Application of 500MPa Water Cutting Composite Material

2017 ◽  
Author(s):  
Shengxiong Xue ◽  
Zhengwen Chen ◽  
Qile Ren ◽  
Caihong Han ◽  
Bo Chen ◽  
...  
Keyword(s):  
High Precision ◽  
High Speed ◽  
Large Scale ◽  
Engineering Application ◽  
Theoretical Research ◽  
Working Pressure ◽  
Technical Requirements ◽  
Test Application ◽  
Water Cutting ◽  
Research On Application

For large scale curved composite components cutting process engineering application, high precision and high speed are basic cutting requirements. This paper proposed to improve the working pressures up to 500MPa as high-end water cutting working condition. Mathematical model was established based on lots of complicated tests, and cutting mechanism with the aim of ultra-high pressure water cutting processing center equipment reliability was designed. Through the test application examples, it is showed that high precision and high speed water cutting composite components are corresponding to reliable water cutting processing operation. The theoretical research, structural design, test application of the project in this paper was well adapted to the high technical requirements for composite craft wing processing. It can be seen that it is very important to improve the working pressure to reach high precision and high speed composite components processing under the premise of reliable operation.

scholarly journals Optical Image Generation and High-precision Line-of-Sight Extraction for Mars Approach Navigation

2018 ◽  
Vol 72 (1) ◽  
pp. 229-252 ◽  
Author(s):  
Xiuqiang Jiang ◽  
Shuang Li ◽  
Long Gu ◽  
Jun Sun ◽  
Dongdong Xiao
Keyword(s):  
High Precision ◽  
Level Line ◽  
Simulation System ◽  
Optical Image ◽  
Least Square ◽  
Line Of Sight ◽  
Image Generation ◽  
Image Simulation ◽  
Extraction Algorithm ◽  
Generation Procedure

A high-precision line-of-sight extraction technique is essential for autonomous optical navigation during the Mars approach phase. To support future Mars exploration missions, an optical image simulation system is a necessary ground verification facility for Mars image generation and line-of-sight extraction algorithm tests. In this paper, an optical image generation procedure is first developed according to projection relationships, reference flight profiles and camera parameters. Next, a hybrid image processing and subpixel-level line-of-sight extraction algorithm is proposed through modification of moment-based sub-pixel edge detection and improvement of direct least-square fitting approaches. Finally, an optical image simulation system is established, and the experimental results show that the proposed procedure can effectively simulate the optical image in the field-of-view of a Mars spacecraft, and the hybrid extraction algorithm can obtain high-precision Mars centroid information.

Research on Method of Credibility Evaluation of Simulation System Based on Mission

2012 ◽  
Vol 198-199 ◽  
pp. 726-731
Author(s):  
Xiang Ping Su ◽  
Qi Lin
Keyword(s):  
Complex System ◽  
Modeling And Simulation ◽  
Large Scale ◽  
Dynamic Method ◽  
Engineering Application ◽  
Simulation System ◽  
Complex Simulation ◽  
Evaluation Work

With the scale of the simulation system is being bigger and bigger, and the complex is being higher and higher, the research on credibility evaluation becomes the hotspot in the modeling and simulation field. This paper is established in resolving the credibility evaluation of large-scale complex simulation system, on the basis of analysis of the characteristic of credibility evaluation of the complex system, it proposes a dynamic method for the credibility evaluation work from the standpoint of the engineering application, and validated by the following instance, it turns up to be effective for the guidance of the credibility evaluation.

Method of High-Precision Calculation on the Linear Parameters for the Stay-Cable of the Cable-Stayed Bridge

2012 ◽  
Vol 178-181 ◽  
pp. 2144-2148 ◽  
Author(s):  
Xi Li ◽  
Ting Ting Cai
Keyword(s):  
High Precision ◽  
Calculation Method ◽  
Engineering Application ◽  
Practical Calculation ◽  
Single Variable ◽  
Stay Cable ◽  
Coordinate Method ◽  
Cable Stayed Bridge ◽  
Moving Coordinate

From the cable-stayed the basic linetype equations,the cable-stayed parameter of engineering application value are derived. The simplifed calculation method of cable-stayed based on origin of moving coordinate method are presented, and then the simple and practical calculation of cable-stayed form are developed using a single variable solve and macro commands of excel. Finally, by comparison shows that the method is correct.

A Study of High-Precision Internal Clock Maintenance Method

2013 ◽  
Vol 765-767 ◽  
pp. 2407-2410
Author(s):  
Bu Xin You ◽  
He Zhi Liu ◽  
Peng Tian ◽  
Jia Xu ◽  
Jing Bu
Keyword(s):  
Real Time ◽  
High Precision ◽  
Random Error ◽  
Engineering Application ◽  
Internal Clock ◽  
Accurate Information ◽  
Dynamic Compensation ◽  
The Real ◽  
Accuracy And Stability ◽  
Gps Timing

In the engineering application, we put forward higher request to the device in the clock accuracy and stability. In this paper, we can modify GPS second pulse online which based on the GPS timing and combine high precision crystal in order to reduce its random error. And on this basis, we put forward a method of dynamic compensation to do the real-time numerical compensation in the apparatus. It can be used as accurate information for the device using nanosecond, not only has high precision, but also simple to implement, and has higher application value in engineering.

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