Experimental study on the cavitation flow and motion characteristics of the vehicle launched underwater

Shi Yao,Lu Jiewen,Gao Shan,Pan Guang,Ren Jinyi 대한조선학회 2023 International Journal of Naval Architecture and Oc Vol.15 No.-

In this paper, an experimental system was independently designed to investigate the cavitation flow mechanism and motion characteristic of the vehicle launched underwater. Conducted experiments based on high-speed photography, and the influence of cavity morphological evolution and kinematic characteristics with the different launch and transverse velocities were analyzed. The results show that cavity shedding phenomenon occurs on different scales. Subsequently, a wide range of pressure impulse on the surface of the vehicle is caused by the collapse of large-scale cavity groups, resulting in an obvious sputtering phenomenon on its surface during the water-exit stage. The more the launch speed increases, the longer the initial cavity length is. Moreover, the moment of completely shedding the cavity delays during the water exit process; Furthermore, with the increase of transverse speed, the attitude angle generally shows an increasing trend, but its growth rate slowed down during the large-scale shedding stage of the cavity.

Research on Innovative Design of Mobile Cooking Table

Shi Yao-jun,Wu Nai-qun,Dai Ye 보안공학연구지원센터 2015 International Journal of Smart Home Vol.9 No.11

The innovative design of mobile cooking table is aimed to meet growing consumers’ demand, on the basis of existing technical conditions. Mobile table is a mobile cooking equipment. But this ‘mobility’ is not defined as the moving of table while working. In other words, it realizes the function of the mobile cooking according to the different operating environment. This paper mainly on the basis of the principle of ergonomics and the concept of humanized design, conduct the design on the overall size and construction of the cooking table from the aspect of function, material and institution to develop a cooking table with strong practicality in order to meet demands of different consumers.

Research on Innovative Design of Shared Refrigerator

Shi Yao-jun,Wu Nai-qun,Dai-ye 보안공학연구지원센터 2016 International Journal of Smart Home Vol.10 No.8

The conceptual design of shared refrigerator is mainly from the humanization to solve the problem that different smells that made by different foods stored together, and it can effectively avoid the unreasonable use of the refrigerator space. In this refrigerator design, the practical problems encountered in the using process are fully considered and analyzed, and the humanized design concept is widely used. This article, focusing on people's needs in their daily lives, taking full account of the relationship between structure and function of the refrigerator, is mainly about the innovative design and research of shared refrigerator in terms of function, structure, materials, process and man-machine relationship, etc. This article puts forwards a new refrigerator–design-concept to make people feel the beauty, happiness and convenience of life brought by the design.

인터넷쇼핑이 고객만족의 구매의도에 미치는 영향에 관한 연구 -중국 시장 중심으로-

( Shi Yi Yao ) 한국인터넷비즈니스학회 2014 인터넷비지니스연구 Vol.15 No.1

인터넷 쇼핑이 새로운 유통 채널이 되었고, 왕성히 발전하기 때문에 연구할 가치가 있다. 이 논문은 인터넷 쇼핑의 편리성, 저렴한 가격, 만족도, 고객의 재구매 의도.가 연구되었다. 이 연구를 위하여 샘플링으로 240부 설문 조사지를 발부하였다. 그 다음에 spss20.0으로 연구 분석하였다. 연구 방법은 성과 분석, 신뢰도 분석, 공동 분석, 회귀 분석으로 인터넷 쇼핑의 편리성, 저렴한 가격, 만족도, 고객의 재구매 의도를 확인하였다. 이 연구의 중요성은 고객의 구매력의 영향을 미치는 4 가지 요소를 분석을 하는 것이다. 연구결과는 인터넷 쇼핑의 큰 잠재력을 보여주었다. 결론으로, 인터넷쇼핑이 고객만족의 구매의도에 많은 영향을 미치는 것으로 조사되었다. Internet shopping is worth studying since it has become a new distribution channel and its booming development. Through research described in this paper: the convenience of internet shopping, low price, pleasure and diversity impact to the customers`re-purchase intent. This study examined a random sample of 240 copies of questionnaires. And use spss20.0 research and analysis. By using the following study methods: result analysis, reliability analysis, mutual analysis and regression analysis, proved that, the convenience of internet shopping, low price, pleasure and diversity produced positive impact to the customers` re-purchase intent. The significance of this study is analyzing the impact the customers` purchasing power by the four factors of internet shopping motivation. And the result shows great potential of internet shopping. In conclusion of this study will contribute to growth in the network market, so that flourish the emerging distribution channels.

Effects of Wind Generation Uncertainty and Volatility on Power System Small Signal Stability

Shi, Li-Bao,Kang, Li,Yao, Liang-Zhong,Qin, Shi-Yao,Wang, Rui-Ming,Zhang, Jin-Ping The Korean Institute of Electrical Engineers 2014 Journal of Electrical Engineering & Technology Vol.9 No.1

This paper discusses the impacts of large scale grid-connected wind farm equipped with permanent magnet synchronous generator (PMSG) on power system small signal stability (SSS) incorporating wind generation uncertainty and volatility. Firstly, a practical simplified PMSG model with rotor-flux-oriented control strategy applied is derived. In modeling PMSG generator side converter, the generator-voltage-oriented control strategy is utilized to implement the decoupled control of active and reactive power output. In modeling PMSG grid side converter, the grid-voltage-oriented control strategy is applied to realize the control of DC link voltage and the reactive power regulation. Based on the Weibull distribution of wind speed, the Monte Carlo simulation technique based is carried out on the IEEE 16-generator-68-bus test system as benchmark to study the impacts of wind generation uncertainty and volatility on small signal stability. Finally, some preliminary conclusions and comments are given.

Mechanical performance and thermal oxidation and of multilayered AlCrN/TiVN hard coatings synthesized by cathodic arc evaporation

Shi-Yao WENG,Meng-Chun CAI,Yin-Yu CHANG 한국진공학회 2016 한국진공학회 학술발표회초록집 Vol.2016 No.8

A High-Precision Form-Free Metrological Method of Aeroengine Blades

Zhao-Yao Shi,Xue-Zhe Li,Yu-Kun Li,Jia-Chun Lin 한국정밀공학회 2019 International Journal of Precision Engineering and Vol.20 No.12

In order to solve the problems in existing methods for blade profile metrology, such as low accuracy and efficiency, poor flexibility, various constraints, a high-precision form-free method for blade profile metrology is proposed. In the paper, the operational principle, key technologies and evaluation methodology are analyzed in detail. A high-precision method for blade profile metrology based on the concept of “Synchronization of Planning and Measurement” is proposed to solve three key problems for blade metrology synchronously: theoretical data acquisition, path planning and sampling strategy analysis, and profile measurement. A form-free evaluation methodology for blade profile based on parametric modeling is also discussed. The results show that the metrology and evaluation for blade profile are executed automatically without theoretical model data, thus improving the efficiency and flexibility greatly. In addition, all the measurements are completed in the positions near the reference distance of the sensor, thus the depth of measurement approaches 0 mm and the measurement error is no more than 10 μm. The method proposed in the paper is a form-free method with a high precision and has a good application prospect in the field of free-form surface measurement.

Effects of Wind Generation Uncertainty and Volatility on Power System Small Signal Stability

Li-Bao Shi,Li Kang,Liang-Zhong Yao,Shi-Yao Qin,Rui-Ming Wang,Jin-Ping Zhang 대한전기학회 2014 Journal of Electrical Engineering & Technology Vol.9 No.1

This paper discusses the impacts of large scale grid-connected wind farm equipped with permanent magnet synchronous generator (PMSG) on power system small signal stability (SSS) incorporating wind generation uncertainty and volatility. Firstly, a practical simplified PMSG model with rotor-flux-oriented control strategy applied is derived. In modeling PMSG generator side converter, the generator-voltage-oriented control strategy is utilized to implement the decoupled control of active and reactive power output. In modeling PMSG grid side converter, the grid-voltageoriented control strategy is applied to realize the control of DC link voltage and the reactive power regulation. Based on the Weibull distribution of wind speed, the Monte Carlo simulation technique based is carried out on the IEEE 16-generator-68-bus test system as benchmark to study the impacts of wind generation uncertainty and volatility on small signal stability. Finally, some preliminary conclusions and comments are given.

An Analytical Solution for Voltage Stability Studies Incorporating Wind Power

Lin, Yu-Zhang,Shi, Li-Bao,Yao, Liang-Zhong,Ni, Yi-Xin,Qin, Shi-Yao,Wang, Rui-Ming,Zhang, Jin-Ping The Korean Institute of Electrical Engineers 2015 Journal of Electrical Engineering & Technology Vol.10 No.3

Voltage stability is one of the most critical security issues which has not yet been well resolved to date. In this paper, an analytical method called PQ plane analysis with consideration of the reactive power capability of wind turbine generator and the wake effect of wind farm is proposed for voltage stability study. Two voltage stability indices based on the proposed PQ plane analysis method incorporating the uncertainties of load-increasing direction and wind generation are designed and implemented. Cases studies are conducted to investigate the impacts of wind power incorporation with different control modes. Simulation results demonstrate that the constant voltage control based on reactive power capability significantly enhances voltage stability in comparison of the conventional constant power factor control. Some meaningful conclusions are obtained.

An Analytical Solution for Voltage Stability Studies Incorporating Wind Power

Yu-Zhang Lin,Li-Bao Shi,Liang-Zhong Yao,Yi-Xin Ni,Shi-Yao Qin,Rui-Ming Wang,Jin-Ping Zhang 대한전기학회 2015 Journal of Electrical Engineering & Technology Vol.10 No.3

Voltage stability is one of the most critical security issues which has not yet been well resolved to date. In this paper, an analytical method called PQ plane analysis with consideration of the reactive power capability of wind turbine generator and the wake effect of wind farm is proposed for voltage stability study. Two voltage stability indices based on the proposed PQ plane analysis method incorporating the uncertainties of load-increasing direction and wind generation are designed and implemented. Cases studies are conducted to investigate the impacts of wind power incorporation with different control modes. Simulation results demonstrate that the constant voltage control based on reactive power capability significantly enhances voltage stability in comparison of the conventional constant power factor control. Some meaningful conclusions are obtained.