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RISS 인기검색어
- 검색키워드
- 저자 : Jinfeng Cao (검색결과 2 건)
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Experiments and simulations of the ballistic response of ceramic composite armors
Jinfeng Cao,Jianzhong Lai,Jiehang Zhou,Ningyu Kang,Longyu Du,Yiqiu Miao 대한기계학회 2020 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.34 No.7
A lightweight multilayer ceramic composite armor with a sandwich structure back plate was proposed by studying the penetration process, damage mechanism, and the function of each layer of the composite armor against the 12.7 mm armor-piercing projectile. The effectiveness of the simulation was verified by comparing the experimental and simulation data. The effects of crack initiation in the ceramics, abrasion of ceramics, and size of ceramic cones on the penetration resistance of targets were discussed. The structural configuration of backplate sequence and thickness ratio was optimized through finite element simulation on ANSYS/LS-DYNA. Results indicate that boundary constraints have a significant effect on the antipenetration performance of ceramics. The antipenetration performance is the best when the structure of restrained composite armor is Al6061/Al 2 O 3 /TC4/ Kevlar ® /TC4 and the thickness ratio of the TC4 transition and back plates is 4:3.
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A ZigBee-based Aquiculture Water Quality Monitoring System
Li Jinfeng,Cao Shun 보안공학연구지원센터 2015 International Journal of u- and e- Service, Scienc Vol.8 No.10
To overcome the issues of many monitoring measurement points, wide range, complex working environment and difficult link in aquaculture monitoring, a low-cost, low-power real-time ZigBee-based water quality monitoring system is presented. The system collects, transmits, displays, queries the water quality parameters (the temperature, dissolved oxygen concentration, pH value, and water level) and controls the increase oxygen machine. The low-power MSP430F149 and CC2530 RF chip are the core of the system which is constituted with the sensor nodes, routing nodes and coordination nodes. The time synchronization algorithm enables all nodes in the network sleep and wake up synchronously to ensure the reliability of data transmission and reduce power consumption. The test results illustrate that the network packet loss rate is 0.83% when the distance between the two nodes is 80 m, which meets the demands of aquiculture. The system runs stably, measures accurately and can automatically regulate the water quality, has certain market value and wide prospects of application.
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