Numerical and Experimental Simulation on Aerodynamic Character of Crescent-Shaped Iced Conductor

2013 ◽  
Vol 275-277 ◽  
pp. 622-627 ◽  
Author(s):  
Xin Min Li ◽  
Kuan Jun Zhu ◽  
Bin Liu
Keyword(s):  
Numerical Simulation ◽  
Wind Tunnel ◽  
Transmission Line ◽  
Driving Force ◽  
Experimental Simulation ◽  
Key Factor ◽  
Simulation And Experiment ◽  
And Control

The dynamics force of iced-conductor is the driving force of galloping, its variation is depended on the aerodynamic character of iced conductor. The aerodynamic character of iced conductor is the key factor of galloping of iced-conductor, but the result of theoretically analysis and numerical simulation isn’t suited for the requirement of transmission line project. In the paper, basing on the theoretically analysis and numerical simulation, the simulation tests in wind tunnel of crescent-shaped iced conductor is stetted up and put into practice, and then the systemic study is carried into execution. The result of research is indicated that there is a better coherence between the numerical simulation and experiment test, and the result of numerical simulation is the beneficial supplement to the experiment test. The result can not only provide the original date for the galloping analysis, but also validate the affectivity of numerical simulation, support the research of mechanism and control of galloping.

Experimental Simulation on Aerodynamic Character of D-Shaped Iced Conductor

2012 ◽  
Vol 614-615 ◽  
pp. 1405-1409
Author(s):  
Xin Min Li ◽  
Kuan Jun Zhu ◽  
Bin Liu
Keyword(s):  
Numerical Simulation ◽  
Wind Speed ◽  
Wind Tunnel ◽  
Transmission Line ◽  
Driving Force ◽  
Experimental Simulation ◽  
Key Factor ◽  
Simulation And Experiment ◽  
And Control

The dynamics force of iced-conductor is the driving force of galloping; its variation is depended on the aerodynamic character of iced conductor. The aerodynamic character of iced conductor is the key factor of galloping of iced-conductor, but the result of theoretically analysis and numerical simulation isn’t suited for the requirement of transmission line project. In the paper, basing on the theoretically analysis and numerical simulation, the simulation tests in wind tunnel of D-shaped iced conductor is stetted up and put into practice under different wind speed and iced thickness, and then the systemic study is carried into execution. The result of research is indicated that there is a better coherence between the numerical simulation and experiment test, and the variation rules of parameters is obvious with the different iced thickness, the result of numerical simulation is the beneficial supplement to the experiment test. The result can not only provide the original date for the galloping analysis, but also validate the affectivity of numerical simulation, support the research of mechanism and control of galloping.

A Numerical Simulation of Micro Bionic Fish in Vessel

2015 ◽  
Vol 799-800 ◽  
pp. 1083-1087
Author(s):  
Chao Yang ◽  
Fu Xian Zhu ◽  
Jin Yu Zhou ◽  
Ju Fang Chen
Keyword(s):  
Numerical Simulation ◽  
Blood Viscosity ◽  
Driving Force ◽  
Elasticity Modulus ◽  
Fish Tissue ◽  
Alloy Sheet ◽  
Frequency Adjustment ◽  
Giant Magnetostrictive Material ◽  
And Control ◽  
Train Of Thought

The work presented a research method of using the external magnetic field to do a numerical simulation of micro bionic fish. The fishtail skeleton was made of alloy sheet and the fish tissue was stuck on the alloy sheet with giant magnetostrictive material (GMM). Then the mechanical model of bionic fish was established. By controlling the swaying of fishtail through external magnetic frequency adjustment, it is possible to make the fish move about just like a natural fish. The statistics show that the average driving force when the bionic fish is switched on largely depends on the material parameter, blood viscosity and external magnetic frequency. The average driving force will increase with the growing elasticity modulus (EM) of fishtail material and blood viscosity. The bionic fish can get a quite large driving force particularly when the external magnetic frequency is getting close to the natural frequency of the system. Thus, these findings can serve as a major train of thought and gist for the design and control of micro bionic fish in vessel.

scholarly journals Numerical Simulation and Experimental Study on Shaped Charge Warhead of Guided Ammunition

2021 ◽  
Vol 2021 ◽  
pp. 1-15
Author(s):  
Guangsong Ma ◽  
Guanglin He
Keyword(s):  
Numerical Simulation ◽  
Cone Angle ◽  
Shaped Charge ◽  
Liner Material ◽  
Penetration Ability ◽  
Simulation And Experiment ◽  
Control Section ◽  
Simulation Results ◽  
And Control ◽  
Shaped Charge Jet

To study the jet penetration capability of shaped charge warhead of guided ammunition, a variable cone angle-shaped charge liner was designed. LS-DYNA software is used to simulate the penetration capability of shaped charge warhead with three different metal materials (copper, steel, and aluminum). Numerical simulation results show that the velocity of the shaped charge jet formed by the three kinds of materials is v aluminum > v copper > v steel , and the residual velocity after penetration is V steel > V aluminum > V copper , the time when the jet starts to break is tcopper > tsteel > taluminum, and the penetration completion time is Tcopper < Taluminum < Tsteel; therefore, according to the numerical simulation results, copper was selected as the liner material, and the principle prototype is made for the experiment. The results of numerical simulation and experiment show that the shaped charge warhead with copper shaped charge liner has good penetration ability and after-effect damage ability to steel target after penetrating the guidance section, steering gear section, and control section.

Numerical Simulation and Experiment on Quenching Process of 718 Mould Steel with New Online Hardening Equipment

2012 ◽  
Vol 572 ◽  
pp. 237-242
Author(s):  
Guo Yong Liu ◽  
Dong Mei Zhu ◽  
Shao Jun Zhang ◽  
Shi Chuang Gong
Keyword(s):  
Numerical Simulation ◽  
Field Experiment ◽  
Water Jet ◽  
Material Microstructure ◽  
Special Steel ◽  
Quenching Process ◽  
Simulation And Experiment ◽  
New Type ◽  
And Performance ◽  
And Control

A new type online hardening equipment for quenching has been developed by University of Science and Technology Beijing and Dongbei Special Steel Group in Dalian Special Steel Co., LTD., which consists of strong water jet, medium water jet, weak water jet, air-water spray and side water jet and has flexible cooling and control ability. Based on the equipment, the online quenching process of 718 mould steel is performed by numerical simulation and field experiment. The result of temperature field by numerical simulation agrees well with that of experiment, which can prove that numerical simulation can be very good guidance for field experiment. Experimental tempering hardness difference of 718 mould steel can be controlled within 2 HRC in the whole plate according to numerical simulation. Prediction technology can meet the different cooling rate control and make quenching process comply with preset quenching route to guarantee material microstructure and performance.

Numerical Simulation and Experiment for Underwater Shock Wave in Newly Designed Pressure Vessel for Food Processing

2010 ◽  
Author(s):  
Manabu Shibuta ◽  
Hideki Hamashima ◽  
Shigeru Itoh
Keyword(s):  
Numerical Simulation ◽  
Shock Wave ◽  
Food Processing ◽  
Eating Habits ◽  
Underwater Shock Wave ◽  
Shock Wave Generation ◽  
Simulation And Experiment ◽  
Underwater Shock ◽  
The Comparative Study ◽  
And Control

Modern eating habits depend in large part on the development of food processing technology. Thermal treatments are often performed in the conventional food processing, but it can cause discoloration and loss of nutrients of the food by thermal processing or treatment. On the other hand, food processing using an underwater shock wave has little influence of heat and its processing time is very short, preventing the loss of nutrients. In this research optical observation experiment and the numerical simulation were performed, in order to understand and control the behavior of the underwater shock wave in the development of the processing container using an underwater shock wave for the factory and home. In this experiment a rectangular container was used to observe the behavior of the underwater shock wave. In the experiment, the shock wave was generated by using explosive on the shock wave generation side. The shock wave, which passed through the phosphor bronze and propagated from the aluminum sidewall, was observed on the processing container side. Numerical simulation of an analogous experimental model was investigated, where LS-DYNA software was used for the numerical simulation. The comparative study of the experiment and the numerical simulation was investigated. The behavior of a precursor shock wave from the device wall was able to be clarified. This result is used for development of the device in numerical simulation.

Numerical Simulation and Experiment on Quenching Process of P20 Die Steel with New Online Pre-Hardening Equipment

2013 ◽  
Vol 307 ◽  
pp. 415-420
Author(s):  
Guo Yong Liu ◽  
Dong Mei Zhu ◽  
Shao Jun Zhang ◽  
Mou Wei Li ◽  
Shi Chuang Gong
Keyword(s):  
Numerical Simulation ◽  
Cooling Water ◽  
Water Jet ◽  
Special Steel ◽  
Die Steel ◽  
Production Experiment ◽  
Quenching Process ◽  
Simulation And Experiment ◽  
And Performance ◽  
And Control

A new online pre-hardening (OPH) equipment for quenching die steel has been developed by University of Science and Technology Beijing (USTB) and Dongbei Special Steel Group in Dalian Special Steel Co., LTD. OPH equipment consists of strong cooling water jet, medium cooling water jet, weak cooling water jet, air-water spray, and side water jet and has flexible cooling and control ability. Based on the equipment, online quenching process of AISI P20 (3Cr2Mo) die steel was performed by numerical simulation and production experiment. The result of temperature field by numerical simulation agrees well with experiment result, which can prove that numerical simulation can be a very good guidance for production experiment. Experimental tempering metallographic structure of the whole P20 plate is tempered troostite and the tempering hardness difference of P20 die steel can be controlled within 3 HRC in the whole plate under quenching process by numerical simulation. The prediction technology of numerical simulation can meet the different cooling rate control and make quenching process comply with preset quenching route to guarantee material microstructure and performance.

NUMERICAL SIMULATION AND EXPERIMENT IN THE INDUCTION PLASMATRON OF THE VAT-104 WIND TUNNEL

2016 ◽  
Vol 47 (5) ◽  
pp. 457-474
Author(s):  
Eduard Borisovich Vasilevskiy ◽  
Boris Evgen'evich Zhestkov ◽  
Vladimir Igorevich Sakharov
Keyword(s):  
Numerical Simulation ◽  
Wind Tunnel ◽  
Induction Plasmatron ◽  
Simulation And Experiment

ACCESS TO AND CONTROL OVER LAND AS GENDERED: CONTEXTUALIZING WOMEN’S ACCESS AND OWNERSHIP RIGHTS OF LAND IN RURAL GHANA

2016 ◽  
Vol 45 (2) ◽  
pp. 28-48 ◽  
Author(s):  
Isaac Dery
Keyword(s):  
Thematic Analysis ◽  
Rural Women ◽  
Rural Poor ◽  
Rural Ghana ◽  
Secure Access ◽  
Key Factor ◽  
Access Rights ◽  
Ownership Rights ◽  
And Control ◽  
Relationship Of

Women’s access to and control over productive resources, including land, has increasingly been recognized in global discussions as a key factor in reducing poverty, ensuring food security and promoting gender equality. Indeed, this argument has been widely accepted by both feminists and development theorists since the 1980s. Based on qualitative research with 50 purposively selected men and women, this study explored the complexity of women’s access to and control over land within a specific relationship of contestations, negotiations, and manipulations with men. Data were analyzed using thematic analysis. While theoretically, participants showed that women’s [secure] access to and control over land has beneficial consequences to women themselves, households and the community at large, in principle, women's access and control status was premised in the traditional framework which largely deprives women, equal access and/or control over the land. The study indicates that even though land is the most revered resource and indeed, the dominant source of income for the rural poor, especially women, gender-erected discrimination and exclusion lie at the heart of many rural women in gaining access to land. This study argues that women's weak access rights and control over land continue to perpetuate the feminization of gender inequality–while men were reported to possess primary access and control over land as the heads of households, women were argued to have secondary rights due to their ‘stranger statuses’ in their husbands’ families. Overall, the degree of access to land among women was reported to be situated within two broad contexts–marriage and inheritance.

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