Discussion and Design of Dynamic Liquid Level Intelligent Monitoring System

Guangdong Qiu,Zhijie Luo,Guofu Zhou 보안공학연구지원센터 2015 International Journal of Smart Home Vol.9 No.11

The problem of how to calculate the height of the liquid level under tilting status is considered. A custom algorithm for obtaining the real height of liquid level according to the difference of distance measured by ultrasonic sensors is proposed. A set of intelligent monitoring system is designed as well. The system, which takes S3C6410 processor as the control core of the front-end system, measures distance by multiple HC-SR04 ultrasonic sensors, compensates temperature via external temperature sensor ds1820, collects data via inserting driver modules, and then gets the liquid level angle by means of the difference between distance, to calculate the liquid level height, both of which will be sent via Bluetooth chip CC2541 and wireless network. The data, received by PC, will be used for graphical interface display and speech broadcasting depending on Processing software programming. The smart phone can also read data and control devices from the front-end. The results of simulation experiment of this system are considered.

Prediction of operating reliability of multi-body mechanism in micro-switches considering parameter distribution and wear of parts

Donghui Li,Xue Zhou,Sanqiang Ling,Yue Jin,Guofu Zhai 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.7

Traditional method evaluates operating reliability by counting life-test results of a small number of samples, which ignores variability between individuals and cannot accurately reflect the true state. This paper proposes a model for predicting operational reliability of mechanism in a batch of micro-switches based on manufacturing parameters, in view of complex structure and diverse manufacturing parameters. A multi-body kinetic model based on manufacturing parameters and principle of action considering contact fatigue and wear was established, and the operating characteristics in the degradation process with sliding wear of joints were obtained. Finally, the linkage with revolute clearance in miniature circuit breaker (MCB) was used as numerical example application to perform investigation. Prediction results are consistent with batch experiments, which verifies accuracy of model. In addition, the optimal combination of clearances was obtained by using genetic algorithm based on predicted model, which increases locking reliability to 99.3 % after 10000 operation cycles.

Numerical study of fly ash deposition process in low temperature economizer under SCR conditions

Shuangcheng Fu,Gang Cao,Guofu Ou,Faqi Zhou,Luyu Li 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.7

After the boiler of a thermal power plant in Nanjing was reformed for denitrification, the clogging of flyash particles occurred near the support beam of the economizer. The critical speed criterion under different workingconditions was constructed by Fluent custom code (UDF), and the change of fly ash deposition on the support beamof the economizer was simulated without ABS and with ABS. At the same time, the influence of the fin layout structureon the movement of smoke and fly ash particles was analyzed. The results show that the stagnation of fly ash particleson the supporting beam is the main cause of sediment clogging. Due to the production of ABS in the process ofdenitrification, the adhesion of fly ash particles is intensified. At the same time, the fin structure on the support beamhinders the lateral movement of fly ash particles, which causes the growth of clogged fly ash near the support plate. Onthis basis, an optimization plan for the fin structure is proposed, which improves the flue gas flow conditions andavoids the occurrence of clogging and growth of fly ash.

Synergic adsorption of acid blue 80 and heavy metal ions (Cu2+/Ni2+) onto activated carbon and its mechanisms

Xinsheng Luo,Ziqiang Lei,Pengxin Zhou,Yani Liu,Guofu Maa,Zhe Zhang 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.27 No.-

A novel synergic adsorption process of acid blue 80 dye (AB80) and heavy metal ions (Cu2+ or Ni2+) on alow-cost activated carbon (PRAC) which was prepared from potato residue was reported. The resultsindicated that the maximum adsorption capacity of PRAC for AB80 and Cu2+ were 294.7 mg/g and45.0 mg/g in the AB80-Cu2+ system, respectively. In the mono-component system, the values were173.0 mg/g and 26.8 mg/g, respectively. Compared with mono-component system, the AB80 and Cu2+showed good synergistic effect on PRAC. The similarly result was revealed in the AB80-Ni2+ system. For abinary system, the adsorption isotherm of AB80 and heavy metal ions followed the non-modified Sipsmodel, and the adsorption kinetic models followed the pseudo-second order kinetic model. The effect ofpH also was discussed, and showed significant role in the binary-component system adsorption. Theselectivity in synergic adsorption was discussed. BET, FE-SEM/EDX and XPS were used to characterizePRAC with and without adsorbed dye and heavy metal ions, possible mechanisms of AB80 and heavymetal ions synergic adsorption process were proposed.

A simulated experimental system and risk prediction method for ignition caused by overhead lines short-circuit

Donghui Li,Yuguang Zhong,Xue Zhou,Guofu Zhai 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.12

In windy weather, overhead lines swing and collide with each other, often resulting in short-circuits and arc faults. The line is partially molten and produces numerous hot metal particles, which fall and may ignite the fuels on the ground. This paper developed an experimental system to obtain hot particle dimensions at different short-circuit current levels. Based on the results of this experiment, an ignition prediction method was developed. The particle parameters from the experiments were used as a bridge that to complete the prediction from short-circuit current to ignition risk. A neural network was trained according to the experimental and calculated results, then used to predict the risk of ignition. The overhead lines in a forest were used as an example application to perform thte investigation. The results show that copper lines in a forest with needles on the ground create a high risk of ignition hazard.

Improved Received Signal Strength Ratio Based High Accuracy Indoor Visible Light Positioning Scheme

Zhijie Luo,JinHua Wang,WenWen Zhao,JianKun Luo,WeiNan Zhang,GuoFu Zhou 보안공학연구지원센터 2016 International Journal of Smart Home Vol.10 No.12

With the increasingly development of Light-emitting Diode (LED) lighting, in this paper, we proposed an Indoor Visible Light Positioning (VLP) Scheme by using visible LED lights for accurate localization. The basic idea of the position scheme is to improve received signal strength ratio algorithm. Received signal strength ratio (RSSR) is the relative ratio of optical powers detected between each LED and optical receiver. In this paper, we introduce concept of multiple LEDs selection to improve RSSR positioning algorithm. By three LEDs are reasonably selected from the multiple LEDs deployed in the room, the positioning accuracy of RSSR is improved. The system can be employed easily because it does not require additional sensors and occlusion problem in visible light would be alleviated. In addition, we performed the simulation experiments, and confirmed the feasibility of our proposed method.

Enhanced Antibacterial Effect of Polypyrazole-Graphene Oxide Composite

Bin Yang,Yufei Wang,Longqiang Xiao,Xiaowen Hu,Guofu Zhou 한국고분자학회 2017 Macromolecular Research Vol.25 No.1

Besides excellent physical performances, graphene oxide (GO) has been widely acknowledged as a potential antibacterial material. Chemical modification of GO was taken out with polypyrazole by facile amidation in the presence of dicyclohexylcarbodiimide (DCC) and then generated polypyrazole-graphene oxide (FGO) nanohybrid. FGO nanohybrid showed smooth and multilayer structures by scanning electron microscopy. The value of static water contact angle of FGO is 103o, suggesting FGO was a hydrophobic material. Thermo gravimetric analysis of FGO showed a 65% mass loss up 50 to 600 oC, suggesting that FGO is a thermal stability material. Inactivation efficiency test of nominal Escherichia coli cells showed that the viability greatly decreased to 7% after 4 h incubation with FGO under 37 oC, indicating an outstanding antibacterial ability of FGO much better than that of polypyrazole and GO.