Device and Method for Large Size Aspheric Measurement

2010 ◽  
Vol 97-101 ◽  
pp. 4324-4327
Author(s):  
Yong Lu Zhu ◽  
Yin Biao Guo ◽  
Xiao Long Ke ◽  
Lu Shuang Chen
Keyword(s):  
Control System ◽  
Measurement System ◽  
Measurement Method ◽  
Measurement Accuracy ◽  
Detection System ◽  
Experimental Results ◽  
Aspheric Surface ◽  
Large Size ◽  
And Control

In this paper, the necessary instrument and control system called the “Large Size Four-axis Measurement System” which used for measuring large size aspheric surface have been designed and established. Then the development of semi-meridian measurement method on basis of large size four-axis detection system has been reported. The measurement paths were planed and the measurement program was performed on the IPC. The method can significantly reduced the align error caused by the aspheric center which is not coincidence with the rotation platform center. With the measurement system, an aspheric surface was successfully measured; whose radius of semi-meridian was 55 mm. The experimental results show that the developed methods are simple and rapid. The measurement accuracy can satisfy requirement of aspheric surface.

scholarly journals A Combined Measurement Method for Large-Size Aerospace Components

Sensors ◽  
2020 ◽  
Vol 20 (17) ◽  
pp. 4843
Author(s):  
Zhilong Zhou ◽  
Wei Liu ◽  
Qiong Wu ◽  
Yuxin Wang ◽  
Binchao Yu ◽  
...  
Keyword(s):  
Measurement System ◽  
Measurement Method ◽  
Measurement Accuracy ◽  
Optimization Method ◽  
High Accuracy ◽  
Control Points ◽  
3D Scanner ◽  
Global Control ◽  
Accuracy Measurement ◽  
Large Size

Automated and high-accuracy three-dimensional (3D) shape measurement is required in quality control of large-size components for the aerospace industry. To eliminate the contradiction between global measurement and local precision measurement control in 3D digitalization for the key local features of the large-size components, a combined measurement method is proposed, including a 3D scanner, a laser tracker, and an industrial robot used as an orienting device, to achieve high-accuracy measurement. As for improving the overall measurement accuracy, an accurate calibration method based on coordinate optimization of common points (COCP) and coordinate optimization of global control points (COGP) is proposed to determine the coordinate systems. Firstly, a coordinate optimization method of common points (COCP) is recommended. Then, a coordinate optimization method of global control points (COGP) based on the angular constraint is proposed for minimizing the measurement errors and improving the measurement accuracy of the position and orientation of the 3D scanner. Finally, a combined measurement system is established, and validation experiments are carried out in laboratory within a distance of 4 m. The calibration experiment results demonstrate that the max and mean errors of the coordinate transformation have been reduced from 0.037 and 0.022 mm to 0.021 and 0.0122 mm. Additionally, the measurement experiment results also show that the combined measurement system features high accuracy.

HP3 Automatic Measurement System

2014 ◽  
Vol 643 ◽  
pp. 233-236
Author(s):  
Jing Bo Xu ◽  
Jian Song Zhang ◽  
Hong Tao Yu
Keyword(s):  
Control System ◽  
Measurement System ◽  
High Efficiency ◽  
Automatic Measurement ◽  
Application System ◽  
Usb Interface ◽  
Labview Software ◽  
Automatic Measurement System ◽  
Control Relay ◽  
And Control

This paper introduce the thought of USB interface application, an automatic measurement system is as an example. The PC control system of automatic measurement by the Labview software programming, then control relay, and control the work state of the HP3. It shows that the design of USB interface application system is realized by using labview programming easy and high efficiency.

Robotic Cross-Lines Laser Indicator and Range Finder

2011 ◽  
Vol 311-313 ◽  
pp. 1594-1598
Author(s):  
June Wen Chen ◽  
Jing Bin Duan ◽  
Shih Jui Wu ◽  
Yi Shan Chen ◽  
Li An Chiu ◽  
...  
Keyword(s):  
Control System ◽  
Experimental Results ◽  
Lens Design ◽  
Range Finder ◽  
Theoretical Derivation ◽  
Robotic Vision ◽  
Cam Design ◽  
Cad Cam ◽  
And Control

A novel robotic vision and control system using cross-lines laser indicator and range finder simultaneously is developed. This modular have fine crossed lines indication of 1.2mm sharpness at 5 m distance, and simultaneously ranging accuracy of 3 mm up to the range of 100 m. The theoretical derivation, CAD/CAM design, and lens design together with experimental results will be presented in detail.

An In-Process Flatness Error Measurement and Compensatory Control System

1988 ◽  
Vol 110 (3) ◽  
pp. 263-270 ◽  
Author(s):  
C. W. Park ◽  
K. F. Eman ◽  
S. M. Wu
Keyword(s):  
Control System ◽  
Measurement System ◽  
Error Measurement ◽  
Measurement And Control System ◽  
Process Measurement ◽  
Compensatory Control ◽  
And Control ◽  
Measurement And Control ◽  
Flatness Error

The principles of a new in-process measurement and control system for flatness errors in machining have been introduced. The laser-based system consists of a stylus, a geometrical table measurement system, and a forecasting compensatory controller. Through the application of the proposed system to simulated and actual cutting data it has been shown that improvements of flatness on the order of 80 percent are feasible.

scholarly journals Design of wireless home temperature and humidity detection system based on Zigbee Design

2021 ◽  
pp. 43-49
Author(s):  
К. Ли
Keyword(s):  
Control System ◽  
Wireless Communication ◽  
Smart Home ◽  
Detection System ◽  
Living Environment ◽  
Technical Requirements ◽  
The Family ◽  
Communication Method ◽  
Temperature And Humidity ◽  
And Control

The function of the home control system is to control household appliances and manage the home, manage the environment in which the family is located, and provide occupants with a safe, efficient and convenient learning and living environment. As the technical requirements for wireless communication required are getting higher and higher, the requirements of the home are also getting higher and higher. Due to the advantages of wireless technology, the communication method of the smart home control system now tends to choose the wireless communication method. This paper designs a wireless home temperature and humidity detection system based on Zigbee, which can connect to the network and detect and control the equipment.

Study on 3-D Measurement Method in Shake Table Tests Using Image Processing Technique: 1st Report - Verification of Synthetic Performance of the Measurement System

2004 ◽  
Author(s):  
Satoshi Fujita ◽  
Osamu Furuya ◽  
Yasushi Niitsu
Keyword(s):  
Measurement System ◽  
Measurement Method ◽  
Measurement Accuracy ◽  
Dynamic Measurement ◽  
Processing Technique ◽  
Shake Table Test ◽  
Image Processing Technique ◽  
Shake Table ◽  
Shake Table Tests ◽  
3 Dimensional

This study has been doing research and development of 3-dimensional measurement method using the image processing technique for the measurement of dynamic displacement in shake table test. This measurement system is a very convenient system because it can measure the three-dimensional dynamic displacement in shake table test in which the several makers are only attached to the surface of an experimental structure. The system therefore is the most suitable measurement system for an evaluation of complex 3-dimensional behavior of experimental model. Fundamental hardware and software for the measurement system have been constructed until now. The fundamental dynamic measurement accuracy and effectiveness of the measurement system have been also confirmed from several shake table tests. This paper describes the dynamic measurement accuracy in shake table test in with the experimental model has several rotational behaviors, and also summarizes the synthetic performance of the proposed measurement system.

Study on 3-D Measurement Method Using Image Processing Technique for Dynamic Displacement in Shake Table Tests

2003 ◽  
Author(s):  
Satoshi Fujita ◽  
Osamu Furuya ◽  
Yasushi Niitsu ◽  
Tadashi Mikoshiba ◽  
Daisuke Nakano
Keyword(s):  
Measurement System ◽  
Measurement Method ◽  
Measurement Accuracy ◽  
Dynamic Measurement ◽  
Processing Technique ◽  
Image Processing Technique ◽  
Shake Table ◽  
Shake Table Tests ◽  
Dynamic Displacement ◽  
3 Dimensional

This study has been doing research and development of 3-dimensional measurement method using an image processing technique for a measurement of dynamic displacement in shake table test. This measurement system is a very convenient system because it can measure the 3-D dynamic displacement in shake table test in which the several makers are only attached to the surface of an experimental structure. The system therefore is the most suitable measurement system for an evaluation of complex 3-dimensional behaviour of test model. Fundamental hardware and software for the measurement system has been constructed until now. The fundamental dynamic measurement accuracy and effectiveness of the measurement system has been also confirmed from several shake table tests. In this paper, the dynamic measurement accuracy in three measurement units on the assumption of practical use is described from the results of shake table tests in National Research Institute for Earth Science and Disaster Prevention using the collapse building and the inverted pendulum model.

A Framework for Fused Experimental/Numerical Plant and Control System Optimization Using Iterative G-Optimal Design of Experiments

2016 ◽  
Author(s):  
Nihar Deodhar ◽  
Christopher Vermillion
Keyword(s):  
Control System ◽  
Optimal Design ◽  
Design Of Experiments ◽  
Center Of Mass ◽  
System Optimization ◽  
Energy System ◽  
Experimental Results ◽  
Optimal Design Of Experiments ◽  
Wind Energy System ◽  
And Control

This paper presents a methodology for optimally fusing experiments and numerical simulations in the design of a combined plant and control system. The proposed methodology uses G-optimal Design of Experiments to balance the need for experimental data with the expense of collecting a multitude of experimental results. Specifically, G-optimal design is used to first select a batch of candidate experimental configurations, then determine which of those points to test experimentally and which to numerically simulate. The optimization process is carried out iteratively, where the set of candidate design configurations is shrunken at each iteration using a Z-test, and the numerical model is corrected according to the most recent experimental results. The methodology is presented on a model of an airborne wind energy system, wherein both the center of mass location (plant parameter) and trim pitch angle (controller parameter) are critical to system performance.

Research on Sound Velocity Measurement Method by Three Microphones Based on LABVIEW

2014 ◽  
Vol 511-512 ◽  
pp. 307-310
Author(s):  
Ran Li ◽  
Tao Feng ◽  
Fu Yao Zang ◽  
Jun Jie Hu ◽  
Li Zhang ◽  
...  
Keyword(s):  
Theoretical Calculation ◽  
Sound Velocity ◽  
Measurement System ◽  
Velocity Measurement ◽  
Measurement Method ◽  
Sound Pressure ◽  
Experimental Results ◽  
New Method ◽  
Labview Software

This paper proposes a new method of getting sound velocity by measuring the sound pressure at three positions in a tube. By using LabVIEW software as a platform and building the measurement system, sound velocity at different frequencies in current media is measured. Compared the experimental results with theoretical calculation ones, the correctness of the method discussed in this paper and the reliability of the system are validated.

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