Design of UPS Battery Remote Monitoring System

Jiabin Wang,Haiying Wang,Tianjun Sun,Yuran Wang,Ruilin Wang 보안공학연구지원센터 2014 International Journal of Multimedia and Ubiquitous Vol.9 No.9

Testing and experimental characterization of a linear permanent magnet actuator for active vehicle suspension

Wang, Jiabin,Wang, Weiya Journal of International Conference on Electrical 2012 Journal of international Conference on Electrical Vol.1 No.4

This paper describes the testing and experimental characterization of a linear permanent magnet actuator, which is designed and developed for active vehicle suspension, under both static and dynamic conditions. Since the active suspension unit operates over a wide force-velocity range with varying duty ratios, it is essential to establish an effective thermal model which can be used for assessing temperature rise of the actuator under various operating conditions. The temperature rise of the actuator is measured and the results are compared with the prediction by the derived transient thermal model. It is shown that the measured actuator parameters and characteristics are closed to their predicted values. The linear actuator is controlled by a dSPACE system via a three phase inverter and its velocity tracking performance is presented.

Research on Deep-Hole Drilling of High-Strength Steel Using Slender Gun Dril

Jiabin Liang,Li Jiao,Pei Yan,Minghui Cheng,Tianyang Qiu,Xibin Wang 한국정밀공학회 2022 International Journal of Precision Engineering and Vol.23 No.8

There are a lot of problems in the processing of deep hole gun drilling of high strength steel, such as difficulty in selecting machining parameters, unknown influence mechanism of machining parameters on drilling force, drilling temperature and machining quality. In this paper, 42CrMo high strength steel is selected as the workpiece material. A numerical model of cutting force is established based on the mechanism of gun drill, and then the finite element simulation and processing test are carried out. The results show that the cutting force decreases with the increase of cutting speed, and increases with the increase of feed speed; the error between the theoretical and actual value is less than 10%. The shape and position accuracy of the entrance end is higher than that of the exit end, but the surface quality is the opposite. Cutting speed and feed speed have a great influence on machining quality, and the cutting fluid pressure mainly affects the surface roughness.

Smooth Path Planning Method for Unmanned Surface Vessels Considering Environmental Disturbance

Jiabin Yu,Zhihao Chen,Zhiyao Zhao,Xiaoyi Wang,Yuting Bai,Jiguang Wu,Jiping Xu 제어·로봇·시스템학회 2023 International Journal of Control, Automation, and Vol.21 No.10

To solve the problems of unsmooth path planning, insufficient dynamic obstacle avoidance ability, and environmental disturbance effect on the path planning result, this paper proposes a smooth path planning method for unmanned surface vessels (USVs) considering environmental disturbance. First, an improved A* algorithm, which uses the path smoothing method based on the minimum turning radius of a USV, is proposed for global path planning. The binary tree method is used instead of the enumeration method to select a relatively optimal path in the current situation to improve algorithm efficiency. In addition, the dynamic window approach (DWA) with the Convention on the International Regulation for Preventing Collision at Sea (COLREGs) constraints is used for local path planning. The dist function in the DWA algorithm is improved to enhance the DWA algorithm’s ability to avoid dynamic obstacles. Finally, the environmental disturbance function is derived and added to the A* and DWA algorithms to handle the effect of environmental disturbances, such as water flow, on the path planning result, which can significantly improve the path-planning ability of the algorithm in the presence of environmental disturbances. Simulation experiments are performed in three scenarios to verify the proposed algorithm. The experimental results show that compared with the other algorithms, the proposed algorithm can effectively avoid dynamic obstacles and reduce the impact of environmental disturbance on the path planning result. At the same time, the proposed algorithm has high efficiency and strong robustness.

Simulation and experiment study of burrs in micro-milling Zr-based metallic glass

Jiachun Wang,Zhenhong Zhang,Chuang Zhang,Jiabin Fu,Jianchao Chen 대한기계학회 2020 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.34 No.7

Metallic glass has been widely used in making micro parts and equipment due to its excellent physical and chemical performance. A large quantity of burrs is produced in the micro-milling process that is hard to remove and seriously affects the quality and precision of the parts. Burrs should be effectively restrained; however, the burrs’ type, position and the effect of milling parameters on burrs’ generation in micro-milling metallic glass have not been systematically studied. In this paper, by using 3-D FEM simulation and taking micro-milling experiments of Zr-based metallic glass (Vit1), the burrs in flat-end milling and ball-end milling micro grooves were investigated. The burrs’ type and position were observed and summarized, the formation process of various burrs was analyzed in detail, and the influence of cutting parameters on burrs was clarified. Comparing the simulation and experiment result, we could confirm that the top burr and the entrance burr were produced during the processing of the flatend milling cutter, and ball-end milling cutter effectively inhibits the production of the top burr but takes no actions on burrs’ generation at the entrance and the bottom of the groove. The main cause of the top burr is the extrusion of the tool, and the extrusion of the cutting layer metal and chip accumulation were the main reason for entrance and exit burrs. Reducing the axial cutting depth could effectively restrain the generation of burrs for both two kinds of milling tools.

Design of Remote Monitoring and Evaluation System for UPS Battery Performance

Chunjie Hou,Jiabin Wang,Chun Gao 보안공학연구지원센터 2016 International Journal of u- and e- Service, Scienc Vol.9 No.5

For the case of each unit battery status parameter of UPS is unpredictable, this paper develops a remote monitoring system, through the connection of local monitoring software and remote monitoring software, interacting database and human-computer to complete this system. Practice has proved that this system can secure stable operation and better meet the requirements of the UPS battery remote monitoring technology.

The Effect of Dividend Smoothing on the Purchase Price Allocation to Goodwill

정진호(Jinho Jeong),Jiabin Wang 한국산업경영학회 2021 경영연구 Vol.36 No.1

IFRS 회계방식의 도입으로 인해 취득영업권의 재량적 가치산정이 중요한 문제로 등장하게 되었다. 기존 연구는 IFRS 도입이후 합병후 인수기업이 피인수 기업의 영업권 가치를 과대 계상함으로써 취득 후 이익에 대해 기회주의적으로 행동한다고 보고하고 있다. 본 연구는 경영자의 이러한 기회주의적 행동이 배당 유연화정책을 통해 완화되는지 여부를 분석하였다. 연구 결과 배당 유연화 정도와 영업권 평가액 사이에 음(-)의 연관성이 있다는 것을 발견하였다. 이러한 발견은 배당유연화 정책이 영업권이 과대 계상되는 문제를 완화하기 위한 효과적인 정책이라는 것을 의미한다. 본 연구는 영업권 매입가격 배분방식에 있어서 기존의 회계적 관점에서 벗어나 최초로 재무적 결정인 배당정책의 중요한 역할을 규명하였다는데 연구의 의의가 있다. It has been well known that acquiring firms engage in an opportunistic manipulation of post-acquisition earnings by overstating the value of goodwill with the introduction of IFRS. This paper investigates whether a dividend policy mitigates this earnings management problem. Using hand-collected data of Korean firms, we find a negative association between the degree of dividend smoothing and the evaluation of goodwill. The empirical evidence shows that dividend smoothing is an effective policy to mitigate the problem of the overstated value of goodwill. One limitation of the study is that the number of firms is too small to possibly generalize beyond the context of this study. Still, the small population did not negate recognition of the importance of dividend policy on the purchase price allocation to goodwill.

APPC compound exerted beneficial effects on calcium deficient and dexamethasone - induced osteoporosis in rat by improving calcium homeostasis

Yingying Dong,Yan Guo,Jiabin Li,Haijun Zhang,Meng Wang,Chunmei Lin,Fengyan Su 한국실험동물학회 2018 한국실험동물학회 학술발표대회 논문집 Vol.2018 No.7

Optimization of the anti-snow performance of a high-speed train based on passive flow control

Guangjun Gao,Zhen Tian,Jiabin Wang,Yan Zhang,Xinchao Su,Jie Zhang 한국풍공학회 2020 Wind and Structures, An International Journal (WAS Vol.30 No.4

In this paper, the improvement of the anti-snow performance of a high-speed train (HST) is studied using the unsteady Reynolds-Averaged Navier-Stokes simulations (URANS) coupled with the Discrete Phase Model (DPM). The influences of the proposed flow control scheme on the velocity distribution of the airflow and snow particles, snow concentration level and accumulated mass in the bogie cavities are analyzed. The results show that the front anti-snow structures can effectively deflect downward the airflow and snow particles at the entrance of the cavities and alleviate the strong impact on the bogie bottom, thereby decrease the local accumulated snow. The rotational rear plates with the deflecting angle of 45° are found to present well deflecting effect on the particles’ trajectories and force more snow to flow out of the cavities, and thus significantly reduce the accretion distribution on the bogie top. Furthermore, running speeds of HST are shown to have a great effect on the snow-resistance capability of the flow control scheme. The proposed flow control scheme achieves more snow reduction for HST at higher train’s running speed in the cold regions.

Capture of CO2 from coal using chemical-looping combustion: Process simulation

Ming Luo,Shuzhong Wang,Jiabin Zhu,Longfei Wang,Mingming Lv 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.3

Coal direct chemical-looping combustion (CLC) and coal gasification CLC processes are the two basicapproaches for the application of the CLC technology with coal. Two different combined cycles with the overall thermalinput of 1,000MW (LHV) were proposed and simulated, respectively, with NiO/NiAl2O4 as an oxygen carrierusing the ASPEN software. The oxygen carrier circulation ratio in two CLC processes was calculated, and the influenceof the CLC process parameters on the system performance such as air reactor temperature and the turbine inletsupplementary firing temperature was investigated. Results found were that the circulation ratio of the oxygen carrierin the coal gasification CLC process is smaller than that in the coal direct CLC process. In the coal direct CLCcombined system, the system efficiency is 49.59% with the CO2 capture efficiency of almost 100%, assuming the airreactor temperature at 1,200 oC and the fuel reactor temperature at 900 oC. As a comparison, the system efficiency ofcoal gasification CLC combined system is 40.53% with the CO2 capture efficiency of 85.2% when the turbine inlet temperatureis at 1,350 oC. Increasing the supplementary firing rate or decreasing the air reactor temperature can increasethe system efficiency, but these will reduce the CO2 capture efficiency.