This paper presents a method for pollution insulator discharge monitoring based on acoustic emission (AE) technology. AE technology is successful non-destructive detection widely applied in many areas, including defects of electrical power equipments. In the process partial there continuous release energy, energy. So severities insulators can be monitored and analyzed flashover prediction condition-based maintain, though online detecting signals. Artificial contaminations tests proved that...

The internal structure analysis of radial tires is great significance to improve vehicle safety and during tire research. In order perform the digital detection composition in cross-sections, a method based on image processing was proposed. research carried out as follows: (a) distribution parametric bead wire, steel belt, carcass section were performed by means processing, connected domain extraction, Hough transform; (b) using angle location area relationship, data optimized through...

Artificial contaminations tests proved that there is a complicated nonlinear corresponding relationship between the acoustic emission signals emitted by polluted insulators and development of contamination discharge. In order to analyze insulator discharge effectively estimate status on surface rightly, least square support vector machine (LS-SVM) produced, which new learning tool. By using LS-SVM, assessment model built. model, multiple variables come from are chosen as input then degree...

The finite element model of the bus body is built in ANSYS software, and was validated by stress tests. mode shapes natural frequencies determine its dynamic response properties, such as transmission vibration from engine. modal analysis performed using ANSYS. Through preliminary shape frequency body, it deduced that second-order excitation engine may be root cause at idle. inertia force moment are calculated simulation formula parameters. results used idle inputs, then harmonic carried out....

External insulation strength assessment of contaminated insulator is proposed in this paper using the acoustic emission signals generated when polluted flashover discharges. Systematic artificial contamination experiments were done. The from monitored by sound monitoring device with high sensitivity. And analyzed. It shows that there a relationship between filthy discharge and signals. 14 features can reflect extracted. Then method principal feature selection based on algorithm ReliefF...

The mutual interference of different frequency devices is one key problems to the effectiveness evaluation electronic information equipment test in complicated electromagnetic environment. mechanism analysed and extensive tests are carried on. results show that stray signal, harmonic intermodualtion have more effect on normal communication.

Tire burst is one of the hot issues in automobile market. Based on tire problem all-steel radial tire, shear strain and energy density at end belt layer are analyzed to extend durability. A multi-objective optimization model was established by finite element analysis, function constraints conditions were set. The scheme determined using differential evolution (DE) method. simulation durability test specimen show that performance has greatly improved after optimization. results combination...

The predecessor of China Optics was and Applied Digest, which founded in 1985. At that time, it the only retrieval journal field optics China. end 2008, Digest renamed

Innovation and inheritability are the key requirements of tire pattern design. This article call attention to similarity detection patterns. A method based on features is proposed. Through in-depth analysis structure, separated into shape texture features. Shape describe arrangement rules between grooves blocks. On other hand, define each block’s surface characteristics, groove depth, width, characteristics. The raw data firstly analyzed through digital image processing technology. Then,...

Information hiding technology can embed specific information in the digital host. Because host changes little, it will not arouse attention of monitor. In order to improve effect and anti-violence extraction ability, logistic chaotic mapping ECC encryption are introduced, random after is proposed. Before data hidden, divided combined, control also embedded BMP image realize improved LSB algorithm.