Li C.,Jilin University |
Liu F.,Jilin University |
Zhang Y.,Changchun Automobile Industry Institute
Proceedings - 2010 3rd International Congress on Image and Signal Processing, CISP 2010 | Year: 2010
Line feature is one of the most important features of palmprint image. A novel approach of principal palm-line extraction is proposed in this paper based on their characteristics of ridge edges. First, gray adjustment and median filtering are used to enhance contrast and weaken noise. Then, palm-lines are detected based on diversity and contrast. After this step, an improved Hilditch algorithm is used to do thinning, an edge tracking approach is applied to get rid of twigs and short lines, and then, the broken lines are connected. Finally, the single pixel principal palm-line image is obtained. The experiment results show that the principle palm-lines of most pictures can be detected correctly by using this algorithm referred above. Moreover, the algorithm can provide effective and accurate statistics for palmprint identification. ©2010 IEEE.
Feng J.,Jilin University |
Wang H.,Jilin University |
Li Y.,Changchun Automobile Industry Institute |
Liu F.,Jilin University
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2015
Feature extraction is one of most basic problems in the research of palmprint recognition. Extracting effective palmprint feature is the crucial problem in the field of palmprint recognition. There was a research focus on how to select the feature. The lacking of main orientation for palmprint recognition system will lead to an incorrect feature extraction and matching. In order to extract more precise palmprint feature, a new method for feature extraction of palmprint was proposed in the research of palmprint recognition, which could improve the efficiency of identification. Firstly, calculating the main orientation of the whole image, and then adjusting the gradient of each pixel according to the main orientation to ensure this method has rotation invariance. Secondly, combining with the method of histogram of oriented gradient and dominant orientation. Finally, the feature value of palmprint was obtained. A reasonable threshold is set to estimate the similarity between the experimental images and the sample images. The experimental results showed that the method proposed in this paper can improve the efficiency of identification. © Springer International Publishing Switzerland 2015.
Yang Z.,Jilin University |
Chen C.,Jilin University |
Li G.,Jilin University |
Wang J.,Jilin University |
Zhang X.,Changchun Automobile Industry Institute
QR2MSE 2013 - Proceedings of 2013 International Conference on Quality, Reliability, Risk, Maintenance, and Safety Engineering | Year: 2013
Machining tools are the main equipments for metal machining and consist of mechanical parts, electrical parts and hydraulic parts, and so on. In order to reduce the probability of failure and improve the reliability of machine tools, this paper firstly performs failure analysis by statistical method. Then the failure trends for the key parts of machining center are given using power law process. In contrast with traditional method, which optimizes maintenance under repair costs, an optimization approach for maintenance is presented under the reliability constraints of machining center that used in a northeast manufacturing plant of China. The proposed analysis process could be a useful tool to assess the reliability and optimize the maintenance policy of machine tools. © 2013 IEEE.
Xu H.,Jilin University |
Ma B.,Jilin University |
Xu Y.,Changchun Automobile Industry Institute
Harbin Gongcheng Daxue Xuebao/Journal of Harbin Engineering University | Year: 2013
The tyre and pavement features have a great influence on the vehicle braking stability. Based on the theory of pavement fracture and the GW contact theory, the real contact area model and the viscoelastic energy loss of tyre-pavement are simplified. An improved sliding friction factor model is proposed for analyzing the impact of the tyre and pavement feature on the sliding friction factor; through the introduction of the nonlinear Fiala tyre model, the impact caused by tyre and pavement to the tyre force are considered. A new vehicle model which considers the dynamic friction characteristic of tyre has been proposed on basis of the simplification of the 15 DOF vehicle model. PC-Crash is applied for verifying the vehicle model and Matlab is used to carry out simulation analysis for the model. The results show that, the model may accurately characterize the influence caused by the tyre and pavement characteristics to the vehicle braking stability, providing a theoretical basis for researching the difference between the dynamic forces of tyres in vehicle braking.
Liu F.,Changchun Automobile Industry Institute |
Zhao Y.,Changchun Automobile Industry Institute
Frattura ed Integrita Strutturale | Year: 2016
Delay fracture is an environmental embrittlement occurring when materials, environment and stress interact with each other and also a form of hydrogen induced material deterioration. It is a leading factor inhibiting the further improvement of strength of steel and iron material. Hence this study analyzed the improved low-carbon Mn-B type ultra-high strength steel plate (1500 MPa) which were processed by conventional heat treatment and heating forming technique and explored the effects of tempering temperature and heating forming technique on the performance of hydrogen induced delay fracture, which provides a reference for the actual application of such kind of steel plate. © 2016 Gruppo Italiano Frattura. All Rights Reserved.
Chen Y.,Changchun Automobile Industry Institute |
Zhang J.,CAS Changchun Institute of Optics and Fine Mechanics and Physics |
Zhang D.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Nami Jishu yu Jingmi Gongcheng/Nanotechnology and Precision Engineering | Year: 2016
This paper studied the fast generation of micro structures by means of micro polycrystalline diamond (PCD) tools, which were fabricated by applying the wire-cut electrical discharge machining (WEDM) technology. Firstly, the machining performance of the micro PCD tools fabrication was investigated in the WEDM process. In order to improve the accuracy of the fabricated tool shape, the motion path of the cutting wire, the sparking gap and the discharging energy were explored. Then, by applying the micro PCD tools which were installed in a precision turning system, micro structures were directly fabricated on the alumina alloy workpiece with just a simple micro turning process, which verifies the feasibility of the proposed microfabrication method. Finally, the micro tool wear was also investigated, and there was no considerable tool shape deterioration or tool edge damage in the micro turning process. However, the adhesion of the workpiece material to the tool cutting edge is one of the reasons to cause the machining accuracy decrease. The proposed microfabrication process is expected to become a potential method for the fast generation and mass production of micro structures in practical industrial applications. © 2016, Editorial Office of Nanotechnology and Precision Engineering. All right reserved.
Gao Y.,Changchun Automobile Industry Institute |
Sun J.,Lanzhou University of Technology
Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering | Year: 2016
Surface plasmon polariton (SPP) are waves that propagate along the metal-dielectric interface with exponentially decaying electromagnetic fields in both sides of the media. The strip surface plasmon waveguide has long been considered a useful device to achieve highly integrated optics. Analysis of SPP excitation and propagation characteristics in the waveguide by relying on a classic model, namely, Drude was presented. This research is conducted from visible light to near infrared incident wavelength. Strip SPP metal waveguide mode field distribution was studied. Results show that when the thickness of the metal remains constant and its width increases, the electromagnetic field distribution becomes increasingly concentrated in both sides of the strips. When the width of the strip is unchanged, thickness increases and the electromagnetic field distribution becomes increasingly focused on the metal inside. A long incident wavelength means that the concentration of metal strip around the electric field is small. Long incident wavelength can also lead to inter-channel interference. That is, having a large wavelength means one must select a wide strip waveguide. This study, which is about spontaneous radiation characteristics from 840 nm to 910 nm strip waveguide, reveals that a small part of radiation is evanescent to the metal area in the surface plasmon evanescent radiation patterns. Application design and analysis indicate that complete transfer of energy only occurs once in the limited transmission distance of the strip SPP waveguide. When the wavelength is long, the concentration field is reduced and coupling is reinforced. The designed coupler can realize optical WDM in 1310 and 1550 nm. © 2016, Editorial Board of Journal of Infrared and Laser Engineering. All right reserved.
Wang M.,Changchun Automobile Industry Institute |
Li W.,Changchun Automobile Industry Institute
International Journal of Earth Sciences and Engineering | Year: 2015
Based on the analysis of existing car defect detection method and flaw detection research status, this paper proposed car crankshaft defect detection intelligent detection image processing method. Image processing mainly include: the image noise reduction, gray degree transformation, image sharpening, edge detection and other functions. For noise present in the image, according to their characteristics, image processing respectively use multiframe overlaying average method and median filtering method for processing. And median filtering has been improved to achieve a relatively good result; for the problem that the contrast is not high, linear transformation, logarithmic transformation and other methods are used to enhance the image; for blurred images, based on the analysis of the reasons, the gradient sharpening combined with closing value judgments is used. Furthermore, paper presents edge extraction based on SUSAN operator applied to the crankshaft images, experimental results show the effectiveness of the algorithm. © 2014 CAFET-INNOVA TECHNICAL SOCIETY. All rights reserved.
Shi X.,Dalian Jiaotong University |
Zhang N.,Changchun Automobile Industry Institute
Applied Mechanics and Materials | Year: 2012
In order to predict the evolutionary potential and the technological development direction of the loader, the combination of the maturity prediction and the technology evolutionary mode and the evolutionary line in TRIZ (Theory of the Solution of Inventive Problems, Invention Problem Solving Theory) determines the technological maturity of the loader, and analyzes the location of the loader's evolutionary route along the different evolutionary mode, finally put forward the possible future development direction of the loader according to the current evolutionary potential. © (2012) Trans Tech Publications, Switzerland.
Song Q.H.,Changchun Automobile Industry Institute
Applied Mechanics and Materials | Year: 2014
Deformation measurement is an important content of engineering surveying and the main objects of the deformation measurement are civilians, industrial buildings, precision engineering, large dam, bridge and the earth’s crust deformation of rock mass. Deformation measurement aims to obtain the deformation data in the process of displacement deformation, and to get the deformation of the status, trend and possible results through the analysis of these data. The existing automatable solution for measuring the deformation all adopt the 3-dimension displacement test, which based on high precision total station, unattended, automatic data acquisition and transmission control mode. © (2014) Trans Tech Publications, Switzerland.