• Title/Summary/Keyword: rotation table

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A Study on the Prediction of Failure Stress for Table Liner under Fatigue Load (피로하중을 받는 테이블 라이너의 파손응력예측에 관한 연구)

  • 이동우;주원식
    • Journal of the Korean Society for Precision Engineering
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    • v.21 no.8
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    • pp.97-105
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    • 2004
  • The vertical roller mill is the important machine grinding and mixing various crude materials in the manufacturing process of portland cement. Table liner is one of grinding elements of vertical roller mill and is subjected to the cyclic bending stress by rollers and the centrifugal force by rotation of table. It demands $4{\times}10^7$ expense of life but has $4{\times}10^6~-8{\times}10^6$ cycle. It fractures at the edge of grinding path of outside roller The repair expense fur it amounts to 30% of total maintenance of vertical roller mill. Therefore, this study shows the fracture mechanism of table liner of vertical roller mill using HDM and fatigue analysis

A Study on on Failure Analysis of Table Liner for Roller Mill (롤러 분쇄기용 테이블 라이너의 파손 해석에 관한 연구)

  • Lee, Dong-Woo;Hong, Soon-Hyeok;Lee, Kyoung-Young;Cho, Seok-Swoo;Joo, Won-Sik
    • Proceedings of the KSME Conference
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    • 2003.04a
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    • pp.163-169
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    • 2003
  • The vertical roller mill is the important machine grinding and mixing various crude materials in the manufacturing process of portland cement. Table liner is one of grinding elements of vertical roller mill and is subjected to the cyclic bending stress by rollers load and the centrifugal force by rotation of table. It demands $4{\times}10^7$ cycle but has $4{\times}10^6{\sim}8{\times}10^6$ cycle. It fractures at the edge of grinding path of outside roller. The repair expense for it amounts to 30% of total maintenance of vertical roller mill. Therefore, this study shows the fracture mechanism of table liner for vertical roller mill using HDM and fatigue analysis

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A Motor Position Detecting Method Using Algorithmic State Machine(ASM) (ASM을 이용한 전동기의 위치 검출 방법)

  • 김지원;전영환;전진홍;전정우;강도현
    • The Transactions of the Korean Institute of Power Electronics
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    • v.7 no.1
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    • pp.11-17
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    • 2002
  • This paper describes on a position detection method for the motors which have repetitive operations using the Algorithmic State Machine(ASM), one of the digital logic design methods. With analyses for the incremental encoder output patterns, state diagram and state table are constructed and a digital circuit which can detect the changing point of direction of motor rotation is designed. To verify the validity of the designed circuit, simulations for all cases in which the direction of motor rotation is changed, are performed. Simulation results show the designed digital circuit can detect the direction of motor rotation accurately for all cases.

The Weld Strength and Design Tables for the Unstiffened Seated Connections (비보강받침접합의 용접강도와 설계도표)

  • Choi, Sun-Kyu;Yoo, Jung-Han;Lee, Kang-Min;Park, Jai-Woo
    • Journal of Korean Society of Steel Construction
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    • v.24 no.2
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    • pp.199-206
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    • 2012
  • Unstiffened seated connections (USC) ensure easy installation and safety during erection, thereby making the process more economical. USCs consist of a seat angle for carrying the beam's reactions and a top angle to provide beam stability. These angles are bolted or welded to the beam and supporting member. This paper sought to propose a design table for the weld strength of such connections obtained from the elastic vector method (EVM) and the instantaneous center-of-rotation method (ICM) in terms of calculating the eccentricity. Also, the proposed design table is compared with both AISC and KBC specifications.

Vibration Characteristics of Compaction Table for Expendable Pattern Casting Process through Changing Vibration Modes (소실모형주조용 조형장치의 진동특성 평가)

  • Lee, Kang-Rae;Choe, Kyeong-Hwan;Cho, Gue-Serb;Lee, Kyong-Whoan;Kim, Myung-Ho;Rim, Kyung-Hwa;Kim, Ki-Young
    • Journal of Korea Foundry Society
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    • v.24 no.5
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    • pp.273-280
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    • 2004
  • Vibrational motions of the compaction table were investigated to select the optimal operation conditions of sand filling and compaction for the EPC process. Their modes were measured at the nine points of the table with changing the relative rotation angles between the two eccentric mass vibrators which were attached parallel beneath the table. Well-defined vibration modes were measured at the center of the table but those of left and right sides of the table were distorted regardless of rotational angle differences. The distortion of vibration modes at both sides of the table were caused by the moment generated by offset positions of two eccentric masses. It was found that the uniform vibration modes would be gathered by controlling the relative distances between the rotating axis and the center of gravity in the compaction system at the various conditions of vibration modes and rotational angle differences.

ANALYSIS OF SLIDING MOTION OF PILED MULTI-BLOCK SYSTEMS CONSIDERING HORIZONTAL ROTATION (적층 강체블록의 수직축 회전을 고려한 Sliding운동 해석과 실험)

  • 황인섭;김재관
    • Proceedings of the Earthquake Engineering Society of Korea Conference
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    • 2003.03a
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    • pp.193-199
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    • 2003
  • The most cultural heritages are composed of piled multi-block systems which are vulnerable to earthquakes. The stone of low height tends to slide when the excitation such as earthquake is applied and this sliding motion has effects on the whole response of the structure. In this study, analytical method of sliding motion of the piled multi-block systems considering horizontal rotation is developed and compared with shaking table test results. It is shown that the nonlinear analysis of sliding motion of multi-block system leads to satisfactory results.

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Development of landmark tracking system (표식 인식 시스템의 개발)

  • 권승만;이상룡
    • 제어로봇시스템학회:학술대회논문집
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    • 1991.10a
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    • pp.642-645
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    • 1991
  • This paper presents the results of research on hardware and software of the landmark tracking system to the positions of moving robot in real time. The landmark tracking system is composed of CCD camera, landmark, strobo system and image processing board. The algorithm calculates the position and direction by using the coordinate transformation fomula after calculating the centroid and rotation angle of landmark at fixed position using the image data. The experiment is performed with landmark tracking system is loaded on xyz-table. XYZ-table is used for identifying the true position in our experiment. The results shows that this system has high performance with maxima error of .+-.1 pixels.

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A Study on the Safety Estimation of Table Liner for Vertical Roller Mill Using HDM (구멍뚫기법을 이용한 수직형 롤러 분쇄기용 테이블 라이너의 안전성 평가에 관한 연구)

  • Lee Dong Woo;Hong Soon Hyeok;Cho Seok Swoo;Joo Won Sik
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.28 no.8 s.227
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    • pp.1221-1228
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    • 2004
  • The vertical roller mill is the important machine grinding and mixing various crude materials in the manufacturing process of portland cement. Table liner is one of grinding elements of vertical roller mill and is subjected to the cyclic bending stress by rollers load and the centrifugal force by rotation of table. It demands $4{\times}10^7$ cycle but has $4{\times}10^6{\sim}8{\times}10^6$ cycle. It fractures at the edge of grinding path of outside roller. The repair expense for it amounts to $30\%$ of total maintenance of vertical roller mill. Therefore, this study shows the fracture mechanism of table liner for vertical roller mill using HDM and fatigue analysis and makes the estimation for safety of vertical roller mill.

Representation and recognition of polyhedral objects in a single 2-D image using the signature technique (하나의 2차원 영상에서 표면의 signature를 이용한 다면체의 표현 및 인식 알고리즘)

  • 이부형;한헌수
    • Journal of the Korean Institute of Telematics and Electronics S
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    • v.34S no.2
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    • pp.63-70
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    • 1997
  • This paper proposes a new algorithm for recognizing polyhedral objects using a single 2-D image. It is base don a new representation scheme having two level hierarchey. In the lower level, geometrical features of each primitive surface are represented using their signatures and the variation of signature due to rotation is represented suing the rotation map. In the higher level, topological features are represented in the inter-surface description table(SDT). Based on the proposed representaton scheme, loer level database searched to find a matching primitive surface. The srotation map determines the degree of rotation as well as the matchness. If all surfaces in a test object find their matching primitive surfaces, its structural information is compared with the SDTs of object models. If primitive surfaces of a test object equal to tha tof certain model and satisfy inter-surfaces relationship in SDT, a test object is recognized as the model.

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Optimal Design for Improved Rotation Latch System Performance (로테이션 래치 시스템 성능 향상을 위한 최적 설계)

  • Jang, Jae-Hwan;Kim, Jin-Ho
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.14 no.5
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    • pp.102-106
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    • 2015
  • In this paper, we study the optimal design for improved rotation latch system performance. The factors affecting the Torque generated in the armature were chosen as design variables. Utilizing the vertical matrix, the orthogonal array table was created to predict the results through minimal analysis. To confirm the Torque generation amount, by utilizing the commercial electromagnetic analysis software MAXWELL, finite element analysis was performed. The approximation method and experimental design through the commercial PIDO tool PIAnO for optimal design and calculations were utilized to perform experiments using an optimization method with evolutionary algorithms. Using the approximation model, design factors were determined that can maximize the torque generated in the armature, and the simulation was performed.