• Title/Summary/Keyword: great freedom

Search Result 107, Processing Time 0.027 seconds

Load simulation for offshore wind turbine (해상풍력터빈에 대한 하중 모사 방법 연구)

  • Suk, Sangmin;Lee, Sunggun;Chung, Chinhwa;Park, Hyunchul
    • 한국신재생에너지학회:학술대회논문집
    • /
    • 2011.05a
    • /
    • pp.58.1-58.1
    • /
    • 2011
  • In this paper, the purpose is a study on structural analysis for offshore wind turbine using commercial code. Because offshore wind turbine is subjected to great wind and wave force, it is necessary to analyse the dynamics and minimize the response of wind turbine. The offshore wind turbine tower is modelled as a single degree of freedom and multi degree of freedom structure. It is assumed that the blades, nacelle are composed of concentrated masses.

  • PDF

Study on the Design Method Development of Crash Cushion Using Single Degree of Freedom (단자유도계를 이용한 충격흡수시설의 설계법 개발)

  • Joo, Jae-Woong;Kim, Ki-Jung;Jang, Dae-Young;Son, Seung-Neo
    • International Journal of Highway Engineering
    • /
    • v.9 no.3
    • /
    • pp.91-100
    • /
    • 2007
  • The most important thing for driver's safety on the road is equipment of crash cushion as a vehicle protection safety facility. But development of crash cushion is defective because there's no rational and reality way of design. And also without an alternative plan, it rely on crash test hereby it suffers a great economic loss and wastes time. This study that uses data of cash test proves the suitability of single degree of freedom which considers the safety of passengers about three-dimensional complicated Crash Analysis. As the study analyzes the conduct of crash cushion, it want to develop the effective method of design on Single Degree of Freedom Crash Cushion. And it presents the way of crash cushion design through making a crash analysis model with single degree of freedom. To verify the validness of the crash cushion plan, with single degree of freedom plan, we make the level CC2 crash cushion and execute the crash test. A performance test brings satisfied result and a plan of single degree of freedom crash cushion is proven as an one of the way to be a good system which can design crash cushion.

  • PDF

Mathematical Model of Two-Degree-of-Freedom Direct Drive Induction Motor Considering Coupling Effect

  • Si, Jikai;Xie, Lujia;Han, Junbo;Feng, Haichao;Cao, Wenping;Hu, Yihua
    • Journal of Electrical Engineering and Technology
    • /
    • v.12 no.3
    • /
    • pp.1227-1234
    • /
    • 2017
  • The two-degree-of-freedom direct drive induction motor, which is capable of linear, rotary and helical motion, has a wide application in special industry such as industrial robot arms. It is inevitable that the linear motion and rotary motion generate coupling effect on each other on account of the high integration. The analysis of this effect has great significance in the research of two-degree-of-freedom motors, which is also crucial to realize precision control of them. The coupling factor considering the coupling effect is proposed and addressed by 3D finite element method. Then the corrected mathematical model is presented by importing the coupling factor. The results from it are verified by 3D finite element model and prototype test, which validates the corrected mathematical model.

Research on Satisfaction Evaluation Based on Tourist Big Data

  • Guo, Hanwen;Liu, Ziyang;Jiao, Zeyu
    • KSII Transactions on Internet and Information Systems (TIIS)
    • /
    • v.16 no.1
    • /
    • pp.231-244
    • /
    • 2022
  • With the improvement of people's living standards and the development of tourism, tourists have greater freedom in choosing destinations. Therefore, as an indicator of satisfaction with scenic spots, tourist comments are becoming increasingly prominent. This paper aims to compare and analyze the landscape image of the Five Great Mountains in China and provide specific strategies for its development. The online reviews of tourists on the Online Travel Agency (OTA) website about the Five Great Mountains from 2015 to 2018 are collected as research samples. The text analysis method and R language are used to analyze the content of the tourist reviews, while the high-frequency words in the word cloud are used for visual display. In addition, the entropy weight method is used to determine the index weight and tourist satisfaction is evaluated to understand the weaknesses of those scenic spots. The results of the study show that firstly, the tourist satisfaction with the Five Great Mountains is basically consistent with its popularity. Secondly, through weight analysis, tourists pay special attention to the landscape features and environmental health of the scenic area, so that relevant departments should focus on building the landscape characteristics and improving the environmental health of the scenic area. At the same time, the accommodation and service management of the scenic spot cannot be ignored. Finally, according to the analysis results, suggestions are made on how to improve the tourist satisfaction with the Five Great Mountains.

현대 패션에 나타난 Eroticism 에 관한 연구-초현실주의와 팝 아트의 Eroticism을 중심으로

  • 이효진
    • Journal of the Korean Society of Costume
    • /
    • v.23
    • /
    • pp.111-130
    • /
    • 1994
  • The purpose of this study was to illuminate eroticism represented din modern fashion. Art based on sex is very important like all of the other cultural values. But we feel that erotic art, neglected, suppressed , and persecuted for centuries, has an important contribution to make to the understanding of art, the social history of mankind, and human happiness and progress. It is our deep personal conviction that erotic art serves important social and therapeutic functions. Erotic art expresses the demand for sexual freedom-a freedom vital to individual happiness and mental well-being, And sexual freedom, in turn, cannot exist without a high degree of political and economic freedom as well. In that sense , erotic art came a truly revolutionaly message ; it demands no less than extension of freedom , not only in the sexual are, but in every sphere of social life. What is eroticism \ulcorner Eroticism must be distinguished from a mere animal reproduction . Eroticism is deeply rooted in the cultural tradition of myth, religion , customes and art. It also has a close relationship with psychological activities of our life. Eroticism is a kind of psychological revolution in the development of human civilization. Eroticism is related to different kinds of art, which express internal spirit of human especially Surrealism. Surrealism is above all a movement of the conquest and deepening of the unconscious. The exploitation of Freud's discoveries opended a new, practically unlimited path for artistic studies to Surrealism . Especially all theory of mental psychoanalysis a affected artists greatly in western art, Freud was appraised highly on his achievements by art critics in art history on his achievements by art critics in art history. As far as erotic subject matter was concerned, Surrealism provided a means of presentig it. Pop Art is not actually a movement , born at a specific time and place, nor is it an easy concept to define. The term first appeared in Great Britain during the fifties, when it referred, particularly in the decorative arts, to an inclination to go back and imitate the stereotyped images of the mass media : film, advertising , cartoons, and other popular consumer products. The eroticism expressed in Pop Art calls the modern's attentions to their devastated minds, taking advantage of the commercialized sex. Fashion has developed constantly reflecting the spiritual aspiration and social and cultural phenomona of man , and artistic steam. Eroticism in fashion is the style which expresses the internal meanings of sexuality through the texture, color, pattern , silhouette etc.

  • PDF

Implementation of the two-degree-of freedom PID Position Controller for Linear Motor Drive with Easy Gain Adjustment (이득 설계가 간단한 선형전동기 2자유도 PID 위치제어기 구현)

  • Ha, Hong-Gon;Lee, Chang-Ho
    • Journal of the Institute of Convergence Signal Processing
    • /
    • v.8 no.2
    • /
    • pp.124-129
    • /
    • 2007
  • Recently, the application of the linear machine for industrial field is remarkably increased, especially for the gantry machine, machine tool system and CNC. However a linear meter remains the vibrational characteristic itself therefore, In these application fields, high position control performance is essentially required in both the steady and the transient states. In this paper, the design method for a position control is proposed by using the two-degree-of freedom PID controller. This method has great features for the linear machine drives such as no over-shoot phenomena and single gain tuning strategy. By comparison with conventional PID controller, the improvement of performance of a linear motor control system using two degrees of freedom controller are discussed. Through the simulation results, the usefulness of the proposed algorithm is proved. With the simulation results, it was made clear that the introduction of two degrees of freedom controller designed by the proposed method not only improves the over shoot and starting characteristic of response but also removes the undesirable characteristic variation.

  • PDF

A Study on Flapper Image through the Culture and Novels in Jazz Age (재즈시대의 문화와 소설을 통해본 플래퍼 이미지)

  • 박혜원
    • Journal of the Korean Society of Clothing and Textiles
    • /
    • v.24 no.2
    • /
    • pp.173-184
    • /
    • 2000
  • The purposes of this study is for consideration of the flapper image through the culture and novels in Jazz Age(1919∼1929) of America. The back ground of flapper fashion was Jazz. Jazz was one of the cultural languages which expressed liveness, noise, salacity, harmony of primitivity, modernity, innocence and freedom. In processing American had gotten economic power, the Jazz Age had new mood which was combined materialism and realitism. Environmental changes of life styles and development of mass culture of modern big cities could aid the birth of modern girls, flappers. They became the main group of new consumer and mass culture in new consciousness and freedom with independence. Their characteristics are confirmed from Fitzgerald's novels, This Side of Paradise and The Great Gatsby. As the results of above, the consciousness of flapper were rebellious attitude, liberalism and actualism. The designs of flapper fashion were expressed by simplicity, functionality, nudity and rhythm. The flapper images are as follows: First, they expressed modern image as a rebellious attitude. Second, flapper had a sensual image of freedom through rhythmical and speedy expression. Third, premature image for pursuing youth could be found. Therefore the changes of culture and women's life styles are very important points for fashion studies and the connecting fashion and other fields like novels is needed also for it.

  • PDF

Design and Control of a Six-degree of Freedom Autonomous Underwater Robot 'CHALAWAN'

  • Chatchanayuenyong, T.;Parnichkun, M.
    • 제어로봇시스템학회:학술대회논문집
    • /
    • 2004.08a
    • /
    • pp.1110-1115
    • /
    • 2004
  • Water covers two-thirds of the earth and has a great influence on the future existence of all human being. Thailand has extensive coastline and near shore water that contain vast biological and mineralogical resources. The rivers and canals can be found around the country especially in the Bangkok, which once called the Venice of the East. Autonomous underwater robot (AUR) will be soon a tool to help us better understand water resources and other environmental issues. This paper presents the design and basic control of a six-degree of freedom AUR "Chalawan", which was constructed to be used as a testbed for shallow. It is a simple low cost open-frame design, which can be modified easily to supports various research areas in the underwater environment. It was tested with a conventional proportional-integral-derivative (PID) controller. After fine-tuning of the controller gains, the results showed the controller's good performances. In the future, the dynamic model of the robot will be analyzed and identified. The advanced control algorithm will be implemented based on the obtained model.

  • PDF

A Study on the r-h methods in Finite Element Analysis (유한요소해석에서 r-h형 적응법에 관한 연구)

  • 김동일;유형선
    • Computational Structural Engineering
    • /
    • v.6 no.3
    • /
    • pp.125-137
    • /
    • 1993
  • Recently, many researches are being dealt with the adaptive method for improving the accuracy of finite element solution. This paper deals with rh-methods that are the combination of r and h-method ; r-method is to relocate the nodes for the grid optimization, h-method is to divide the elements with great error into the equal shape. As a results, rh-method has the same error decrease and convergence as h-method in the same degree of freedom, but it has more exact result of finite element in the state of restraining degrees of freedom than h-method alone.

  • PDF

A study on the improvement of cutting precision of CNC system using $H_{\infty}$ 2-degree-of-freedom controller ($H_{\infty}$ 2 자유도 제어기를 이용한 CNC 시스템의 가공 정밀도 향상에 관한 연구)

  • 최성규;최병욱;현용탁;강성귀;권욱현
    • 제어로봇시스템학회:학술대회논문집
    • /
    • 1996.10b
    • /
    • pp.1040-1043
    • /
    • 1996
  • The accuracy of the servo control in CNC system has a great influence on the duality of machine product. Tracking performance of the servo control is deteriorated mainly by the time delay of the servo system and the inertia of the work table or bed. Contouring errors occur in every interpolation steps by the effect of the tracking performance. In this paper, $H_{\infty}$ two-degree-of-freedom(TDF) controller is designed for improvement to improve the tracking performance. The designed controller is applied 3-axis machining center model and the cutting accuracy is simulated in case of corner cutting, circular and involute interpolation. Simulation results show that $H_{\infty}$ TDF controller designed in this paper has a good effect to improve tracking performance in CNC system.

  • PDF