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Li J.,Jilin University | Li J.,Changchun University of Science and Technology | Du F.,Armor Technique Institute of PLA | Liu X.,Jilin University | And 2 more authors.
Journal of Bionic Engineering | Year: 2011

Bionic alumina samples were fabricated on convex dome type aluminum alloy substrate using hard anodizing technique. The convex domes on the bionic sample were fabricated by compression molding under a compressive stress of 92.5 MPa. The water contact angles of the as-anodized bionic samples were measured using a contact angle meter (JC2000A) with the 3 μL water drop at room temperature. The measurement of the wetting property showed that the water contact angle of the unmodified as-anodized bionic alumina samples increases from 90° to 137° with the anodizing time. The increase in water contract angle with anodizing time arises from the gradual formation of hierarchical structure or composite structure. The structure is composed of the micro-scaled alumina columns and pores. The height of columns and the depth of pores depend on the anodizing time. The water contact angle increases significantly from 96° to 152° when the samples were modified with self-assembled monolayer of octadecanethiol (ODT), showing a change in the wettability from hydrophobicity to super-hydrophobicity. This improvement in the wetting property is attributed to the decrease in the surface energy caused by the chemical modification. © 2011 Jilin University. Source


Liu Y.-L.,Academy of Armored force Engineering | Gao J.-Y.,Armor Technique Institute of PLA
Advanced Materials Research | Year: 2013

A high frequency pulse D.C. Link Soft-Switched Electron load based on Discrete Pulse Modulation (DPM) control is introduced. The method of energy recovery is used to implement various discharging of the storage battery. The electron load developed has good performances such as a good sinusoidal output wave, a rapid dynamic response and a good stability etc. © (2013) Trans Tech Publications, Switzerland. Source


Li J.,Aerospace Research Institute of Materials And Processing Technology | Wang H.,Armor Technique Institute of PLA | Li S.,Aerospace Research Institute of Materials And Processing Technology
Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering | Year: 2015

The combination of three processing routes including cryomilling, hot isostatic pressing (HIP) and hot extrusion was used for fabrication of bulk nanocrystalline Al 7050. The microstructure and fractography of the material were observed by transmission electron microscopy (TEM) and scanning electron microscopy (SEM). Furthermore, the chemical composition, density, microhardness and tensile properties of the material were also measured. Results show that the average grain size of the bulk nanocrystalline Al 7050 ranges from 100 nm to 200 nm. The density and HV microhardness of the material are 2.76 g/cm3 and 1184 MPa, respectively. The resulted sample exhibits ultimate strength of 412 MPa with an elongation of 5.2%. After ageing treatment, the ultimate strength and elongation of the material increase by 1.21% and 50%, respectively, which are still lower than that of the conventional Al 7050. The results suggest that improper selected starting powder and milling parameters result in the flake-like morphology of the cryomilled powder. The flake-like morphology makes it difficult for the cryomilled powder to fill the can entirely and to achieve a high density material, which lead to the weak interface within the bulk material and in turn degrade the mechanical properties of the bulk nanocrystalline Al 7050 prepared in the present work. ©, 2015, Rare Metals Materials and Engineering Press. All right reserved. Source


Xu H.F.,Armor Technique Institute of PLA
Applied Mechanics and Materials | Year: 2014

For armored vehicles electrical system fault diagnosis of fault original data collection difficult situation, this paper introduces the fault diagnosis technology based on fault tree model and fault diagnosis based on neural network technology, and the two kinds of fusion technology, complement each other, with a certain type of equipment control system as an example the case analysis, illustrates the fault tree of the neural network and the rationality and validity of the integrated fault diagnosis thinking. © (2014) Trans Tech Publications, Switzerland. Source


Wang L.B.,Armor Technique Institute of PLA
Applied Mechanics and Materials | Year: 2014

In this paper, the cause of nc machine tool geometric error made a more detailed analysis, the system error compensation methods are summarized, and on this basis this paper expounds the applications of all kinds of error compensation method, in order to further realize the accuracy of machine tool software upgrade to lay the foundation. © (2014) Trans Tech Publications, Switzerland. Source

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