A method for automatic installation and positioning of fatigue testing machine specimens based on machine vision
A fatigue testing machine and automatic installation technology, applied in the direction of instruments, adaptive control, control/adjustment systems, etc., can solve the problems of low precision, time-consuming and labor-intensive, etc., and achieve the effect of high precision
Active Publication Date: 2018-04-20
ZHEJIANG UNIV OF TECH
View PDF2 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0004] In order to overcome the time-consuming, laborious and low-precision deficiencies of the existing fatigue testing machine specimen installation and positioning methods, the present invention provides a machine vision-based fatigue testing machine specimen automatic installation and positioning method, using machine vision and image processing technology Calculate the hole difference between the test piece hole and the fixture hole, on the basis of realizing the image acquisition of the upper computer and the motor motion control, control the lifting and lowering of the fixture under the workbench to align the fixture hole with the test piece hole, and realize the automatic installation and positioning of the test piece
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
example
[0077] Example: PLG-100 high-frequency fatigue testing machine produced by Gansu Tianshui Hongshan Factory, SONY XC-HR70 camera, HX-A30-D70-W-24V ring light source from WEILANG Company in Germany, PENTAX-B2514D lens from Pentax Company in Japan, The PCI-1410 image acquisition card and other hardware devices of American NI Company, using image processing technology and fuzzy PID control technology, conduct research on the alignment between CT specimens and PLG-100 high-frequency fatigue testing machine. The system flow chart is as follows: image 3 shown.
[0078] Step 1. Acquire images. Start the program to initialize the system, turn on the ring light source to uniformly irradiate the surface of the specimen and fixture, adjust the position of the camera to obtain more details, and collect images.
[0079] Step 2. Serial communication. In this experiment, serial port communication RS232 is used between the host computer on the server side and the field controller. First, t...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
A method for automatic installation and positioning of fatigue testing machine specimens based on machine vision. The images of the lower fixture hole and the specimen hole are obtained through CCD, and the images are subjected to system calibration, image preprocessing, image analysis, and image recognition operations. The method detects the hole of the specimen and the hole of the fixture respectively, and then calculates the pixel distance between the two circular holes through the position measurement algorithm and converts it into the actual size through the system calibration value. The hole difference data is used as the trigger signal for motor control. The motor is moved and positioned, so that the hole of the lower fixture and the hole of the test piece are completely aligned, and the automatic installation and positioning of the test piece of the fatigue testing machine is realized. The invention realizes the automatic installation and positioning of the test piece, saves time and effort, and has high precision.
Description
technical field [0001] The invention relates to the fields of machine vision, image processing and automatic control, in particular to a machine vision-based automatic installation and positioning method for a test piece of a fatigue testing machine. Background technique [0002] Fatigue damage is the main form of failure of mechanical parts. Since it cannot be completely studied through effective theoretical methods at present, the fatigue crack growth test of specific materials is carried out by fatigue testing machine to explore the law of the extended fracture process of parts. very important. Due to the need to carry out a large number of fatigue crack growth tests on test pieces of different shapes and different materials, it is necessary to frequently install and disassemble the test pieces on the fatigue testing machine. The high-frequency fatigue testing machine generally has the upper fixture (or lower fixture) fixed, and the lower fixture (or upper fixture) can c...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): G05B13/04
Inventor 姜伟高红俐刘辉郑欢斌朱亚伦刘欢邵新阳
Owner ZHEJIANG UNIV OF TECH