• Title/Summary/Keyword: 편심도

Search Result 615, Processing Time 0.042 seconds

Development of Fault Diagnosis Technology Based on Spectrum Analysis of Acceleration Signal for Paper Cup Forming Machine (가속도 신호의 주파수 분석에 기반한 종이용기 성형기 구동축 고장진단 요소기술 개발)

  • Jang, Jaeho;Ha, Changkeun;Chu, Baeksuk;Park, Junyoung
    • Journal of the Korean Society of Manufacturing Process Engineers
    • /
    • v.15 no.6
    • /
    • pp.1-8
    • /
    • 2016
  • As demand for paper cups markedly increases, this has brought about a requirement to develop fast paper cup forming machines. However, the fast manufacturing speed of these machines causes faults to occur more frequently in the final product. To reduce the possibility of producing faulty products, it is necessary to develop technologies to monitor the manufacturing process and diagnose the machine status. In this research, we selected the main driving axis of the forming machine for fault diagnosis. We searched the states of rotational elements related to the driving axis and suggested a fault diagnostic system based on spectrum analysis consisting of a real-time data acquisition device, accelerometers, and a diagnosis algorithm. To evaluate the developed fault diagnostic system, we performed experiments using a test station which resembles the actual paper cup forming machine. As a result, we were able to confirm that the proposed system was sufficiently feasible to diagnose any abnormalities in the operation of the paper cup forming machine.

Radius-Measuring Algorithm for Small Tubes Based on Machine Vision using Fuzzy Searching Method (퍼지탐색을 이용한 머신비전 기반의 소형 튜브 내경측정 알고리즘)

  • Naranbaatar, Erdenesuren;Lee, Sang-Jin;Kim, Hyoung-Seok;Bae, Yong-Hwan;Lee, Byung-Ryong
    • Transactions of the Korean Society of Mechanical Engineers A
    • /
    • v.35 no.11
    • /
    • pp.1429-1436
    • /
    • 2011
  • In this paper, a new tube-radius-measuring algorithm has been proposed for effectively measuring the radii of small tubes under severe noise conditions that can also perform well when metal scraps that make it difficult to measure the radius correctly are inside the tube hole. In the algorithm, we adopt a fuzzy searching method that searches for the center of the inner circle by using fuzzy parameters for distance and orientation from the initial search point. The proposed algorithm has been implemented and tested on both synthetic and real-world tube images, and the performance is compared to existing circle-detection algorithms, such as the Hough transform and RANSAC methods, to prove the accuracy and effectiveness of the algorithm. From this comparison, it is concluded that the proposed algorithm has excellent performance in terms of measurement accuracy and computation time.

Dynamic Interaction Analysis of Vehicle-Suspension Bridge Considering Flexural and Torsional Behaviors and Shear Deformation Effects (휨 및 비틀림 거동 및 전단변형 효과를 고려한 차량-현수교의 동적 상호작용 해석)

  • Kim Moon-Young;Lim Myoung-Hun;Kwon Soon-Duck;Kim Ho-Kyung;Kim Nam-Il
    • Journal of the Computational Structural Engineering Institute of Korea
    • /
    • v.18 no.4 s.70
    • /
    • pp.361-372
    • /
    • 2005
  • In the previous study(Kim 등, 2004), the finite element method was used for the vortical vibration analysis of suspension bridge with the effects of the shear deformation and the rotary inertia under moving load considering the bridge-vehicle interaction. The purpose of this study is to investigate the effect of an eccentric vehicle and shear deformation. So we firstly performs the eigenvalue analysis for the free vortical and the torsional vibration of suspension bridges using FEM analysis. Next the equations of motion considering interaction between suspension bridges and vehicles/trains are derived using the mode superposition method. And then dynamic analysis was performed using the Newmark method. Finally through the numerical examples, the dynamic responses of bridges are investigated according to the proposed procedure.

Development of Standard Test Specification for Hiking Stick (등산스틱 시험규격 개발 연구)

  • Kil, S.K.;Kim, J.H.;Kim, T.W.;Lee, S.C.;Hwang, J.H.
    • Journal of rehabilitation welfare engineering & assistive technology
    • /
    • v.9 no.4
    • /
    • pp.309-317
    • /
    • 2015
  • In this paper, we proposed the standard test specification for safety and function of hiking stick for the elderly. We have concluded nine factors representing specification of hiking stick through analysis of hiking patents and research papers, products survey of business market, case studies for damaged hiking stick and expert surveys. To test the factors, we designed three different kinds of apparatus to examine twist resistance, stick and tip durability and stick straightness. The sample of hiking sticks purchased from market based on Naver sales ranking top to fifteenth. As a result, we concluded six-standard test specification based on eccentric load, adjustable parts load, hand strap load, basket load, tip load and pull load of hiking stick.

  • PDF

Echocardiographic Diagnosis of Mitral Valve Dysplasia Concurrent with Mitral Stenosis and Tricuspid Valve Dysplasia in a Dog (개에서 승모판 이형성증과 병발한 승모판 협착증 및 삼첨판 이형성증의 심초음파적 특징 1례)

  • Choi, Soo-Young;Lee, Jung-Woo;Lee, Young-Won;Choi, Ho-Jung
    • Journal of Veterinary Clinics
    • /
    • v.32 no.1
    • /
    • pp.101-104
    • /
    • 2015
  • A 4-years-old, intact male Golden retriever dog was presented with abdominal distension and dyspnea. Physical examination revealed arrhythmia and cardiac murmur. Generalized cardiomegaly, pleural effusion and ascites were shown on thoracic and abdominal radiographs. Two-dimensional echocardiography revealed abnormal mitral and tricuspid valve motion, mitral and tricuspid regurgitation, left ventricular eccentric hypertrophy and left atrial dilation. Color-flow Doppler imaging revealed turbulent flow extending into the left ventricle during diastole from the mitral valve orifice, and into the left atrium during systole. Spectral Doppler recordings revealed highly increased early diastolic mitral valve inflow and prolonged pressure half-time of mitral inflow. Based on the echocardiographic examination, the diagnosis was made as the mitral valve dysplasia concurrent with mitral valve stenosis and tricuspid valve dysplasia.

Design of Longitudinal prestress of precast decks in twin-girder continuous composite bridges (강박스거더 교량의 프레임 형식 중간다이아프램의 설계)

  • Yoon, Dong Yong;An, Sung Hyun;Lee, Sung Chul
    • Journal of Korean Society of Steel Construction
    • /
    • v.18 no.5
    • /
    • pp.515-524
    • /
    • 2006
  • Cross-sectional distortions take place when steel box girders a re subjected to torsional moment, as a consequence of which distortional warping stresses are necessarily developed. Additional normal stresses due to the distortion are should be included at the design stage. The relative magnitude with respect to the maximum bending stress are kept less than the specific values, i.e., at 5~10%, by properly spaced intermediate diaphragms that could prevent the distortional deformation of the box girder. However, current design equations for the stiffness of intermediate diaphragms were derived based on BEF. In this study, the area required by the intermediate diaphragm members are investigated through three-dimensional finite element analyses. The results of the analyses indicate that the current equations give to conservative values for the intermediate diaphragm of box girder bridges. Finally, an improved equation for the area of the intermediate diaphragm is derived from a regression analysis from the finite element analysis results.

Direct Design of Composite Prestressed Concrete Beams (프리스트레스트 콘크리트 합성(合性)보의 직접설계(直接設計))

  • Kim, Su Man
    • KSCE Journal of Civil and Environmental Engineering Research
    • /
    • v.10 no.3
    • /
    • pp.49-56
    • /
    • 1990
  • Todays, design of composite prestressed concrete beams is carried out by calculation of the prestressing force and its eccentricity assuming the sectional properties. However the characteristics of composite section made with a precast prestressed concrete beams and reinforced concrete slab is not reflected, so iteration method has been adopted. But its methed requires much time and labor. Accordingly, an improved design method will be presented. In this study, improved design method is proposed to design composite section directly without iterative calculation. Design examples according to the proposed design method are presented for easy application and verification of its reliability and authenticity. The results match well with the Hatcher's.

  • PDF

A Study on Vibration Detection Method of Disc by Differential Amplifying Optical Power in Optical Disc Media (광 디스크 장치에서 광량 차동증폭에 의한 디스크 진동 검출 방안에 관한 연구)

  • 김진선;곽경섭
    • Journal of Korea Multimedia Society
    • /
    • v.5 no.2
    • /
    • pp.215-221
    • /
    • 2002
  • In high speed optical disc devices, the vibration caused by unbalanced displacement leads the focus and tracking servo systems to be unstable, and increases the data search time. In this paper, we propose a new scheme to solve the unbalanced displacement problem. The proposed method detects the unbalanced rate by differential amplifying optical power received at photo diode and converts it into an electrical signal. controlling the speed of spindle motor, according to the detected unbalanced rate, makes it possible to improve the performance of tracking and data searching tasks. Also, we analyze the dynamic characteristics of focus and tracking servo systems in high speed mode and provide the firmware and hardware architecture that the proposed method can be installed as an add-on- module in the existing system.

  • PDF

Cellular Anatomy of Compression Wood and Opposite Wood in a Branch of Taxodium distichum Rich. (낙우송(落羽松)(Taxodium distichum Rich.) 지재(枝材)의 압축이상재(壓縮理想材) 및 대응재(對應材)에 관한 해부학적(解剖學的) 특성(特性))

  • Lee, Phil Woo;Chung, Youn Jib;Kwon, Mi
    • Journal of Korean Society of Forest Science
    • /
    • v.80 no.3
    • /
    • pp.296-302
    • /
    • 1991
  • Compression wood and opposite wood formed in a branch of Taxodium distichum Rich. is described and compared in qualitative and quantitative anatomical aspects. The qualitative features of compression wood appeared to differ from those of opposite wood in very gradual tracheid transition from earlywood to latewood, roundish tracheid shape on cross surface, tracheid tip distortion on radial surface, and existence of intercellular spaces and helical cavities. In quantitative features, compression wood tracheids showed shorter lengths than opposite wood. The ray density and the number of uniseriate rays were greater in compression wood than in opposite wood but the height of uniseriate rays in compression wood was smaller than in opposite wood.

  • PDF

A Study on the Bending and Torsional Behaviors of Cable-Stayed Bridges under a Concentrated Moving Load (집중 이동하중을 받는 사장교의 휨 및 비틈 거동에 관한 연구)

  • Chang, Sung Pil;Yhim, Sung Soon;Chu, Seok Beom
    • KSCE Journal of Civil and Environmental Engineering Research
    • /
    • v.9 no.3
    • /
    • pp.1-12
    • /
    • 1989
  • The nonlinearity of a cable-stayed bridge results from the large displacement of main girder due to a long span, the catenary action of cables and the flexural stiffness reduced by large axial forces. The dynamic behaviour of a cable-stayed bridge plays an important role in determining its safety. Especially, when the eccentrically moving load is applied to a cable-stayed bridge, the torsional vibration and vertical vibration are coupled and moreover the variation of cable tensions shows important dynamic characteristics. This dissertation presents a theoretical study and a finite element procedure for analysis of a cable-stayed bridge under a eccentrically moving load. Attention is focused on the dynamic behaviours such as dynamic increments of cable tensions and nodal displacements, with the variety of velocities and eccentricities of moving load. It is found that a moving load with eccentricity can have significant effects upon the responses; the torsion of bridge deck and the increments of cable tensions, according to the present results in this study.

  • PDF