• Title/Summary/Keyword: Automatic-Analysis

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A Reliability Analysis Application and Comparative Study on Probabilistic Structure Design for an Automatic Salt Collector (자동채염기의 확률론적 구조설계 구현을 위한 신뢰성 해석 응용과 비교연구)

  • Song, Chang Yong
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.19 no.12
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    • pp.70-79
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    • 2020
  • This paper describes a comparative study of characteristics of probabilistic design using various reliability analysis methods in the structure design of an automatic salt collector. The thickness sizing variables of the main structural member were considered to be random variables, including the uncertainty of corrosion, which would be an inevitable hazard in the work environment of the automatic salt collector. Probabilistic performance functions were selected from the strength performances of the automatic salt collector structure. First-order reliability method, second-order reliability method, mean value reliability method, and adaptive importance sampling method were applied during the reliability analyses. The probabilistic design performances such as reliability probability and numerical costs based on the reliability analysis methods were compared to the Monte Carlo simulation results. The adaptive importance sampling method showed the most rational results for the probabilistic structure design of the automatic salt collector.

Automatic analysis of golf swing from single-camera video sequences (단일 카메라 영상으로부터 골프 스윙의 자동 분석)

  • Kim, Pyeoung-Kee
    • Journal of Korea Society of Industrial Information Systems
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    • v.14 no.5
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    • pp.139-148
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    • 2009
  • In this paper, I propose an automatic analysis method of golf swine from single-camera video sequences. I define necessary swing features for automatic swing analysis in 2-dimensional environment and present efficient swing analysis methods using various image processing techniques including line and edge detection. The proposed method has two characteristics compared with previous swing analysis systems and related studies. First, the proposed method enables an automatic swing analysis in 2-dimension while previous systems require 3-dimensional environment which is relatively complex and expensive to run. Second, swing analysis is done automatically without human intervention while other 2-dimensional systems necessarily need analysis by a golf expert. I tested the method on 20 swing video sequences and found the proposed method works effective for automatic analysis of golf swing.

Dynamical Mechanism Analysis of An Industrial Two-step Folding Automatic Door (2단 접이식 산업용 자동문의 동역학적 메카니즘 해석)

  • Yun, Seong-Ho
    • Journal of the Korean Society for Precision Engineering
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    • v.28 no.7
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    • pp.821-826
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    • 2011
  • This paper deals with an analysis of dynamic mechanism for the industrial two-step folding automatic door. A nonlinear equation of motion was derived in terms of folding angle to estimate driving forces. Based on this dynamic behavior, time taken during the door's opening well as their velocities were controlled so that the operating conditions can be obtained for the purpose of design. The stiffness of twisting spring was also investigated when the automatic door closed, because a dangerous accident takes place from the door's free falling. The current research will be a very useful tool in the near future for the dynamic analysis for the multi-step folding automatic door.

Dynamic Analysis of an Automatic Dynamic Balancer in a Rotor with the Bending Flexibility (축의 굽힘효과를 고려한 회전체에 장착된 자동평형장치의 동적해석)

  • Jeong, Jin-Tae;Bang, In-Chang
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.25 no.7
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    • pp.1125-1130
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    • 2001
  • Dynamic behaviors of an automatic dynamic balancer are analyzed by a theoretical approach. Using the polar coordinates, the non-linear equations of motion for an automatic dynamic balancer equipped in a rotor with the bending flexibility are derived from Lagrange equation. Based on the non-linear equation, the stability analysis is performed by using the perturbation method. The stability results are verified by computing dynamic response. The time responses are computed from the non-linear equations by using a time integration method. We also investigate the effect of the bending flexibility on the dynamics of the automatic dynamic balancer.

Analysis on Vibration Characteristic of Tooling Unit on Precision Automatic Lathe (정밀 자동선반 공구 유닛의 진동특성 해석)

  • Joo, KangWo;Lee, YunChul;Lee, Young-Sik;Son, Jung-Jong;Lee, Jae-Kwan;Kim, Kwang sun
    • Journal of the Semiconductor & Display Technology
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    • v.15 no.1
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    • pp.36-40
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    • 2016
  • This paper is about the analysis on the vibration characteristic of tooling units on the precision automatic lathe. The vibration characteristic of the machine tool is emphasized in accordance with the high precision of the various industries Including the various semiconductor devices and components sector. In this paper, the vibration analysis was performed in designed tooling units of precision automatic lathe. Through the analysis, it is calculated that the frequency of distribution in certain areas by review the resonant frequency and the amount of deformation. And designed model was verified to be a stable structure.

A Study on the Automatic Elimination of Free Edge for Sheet Metal Forming Analysis (박판성형해석을 위한 자동 프리에지 제거에 관한 연구)

  • 유동진
    • Transactions of Materials Processing
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    • v.13 no.7
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    • pp.614-622
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    • 2004
  • A new approach for the automatic elimination of free edges in the finite element model for the analysis of sheet metal forming processes is presented. In general, the raw finite element model constructed from an automatic mesh generator is not well suited for the direct use in the downstream forming analysis due to the many free edges which requires tedious time consuming interactive graphic operations of the users. In the present study, a general method for the automatic elimination of free edges is proposed by introducing a CAD/CAE hybrid method. In the method a trimmed parametric surface is generated to fill the holes which are orginated from the free edges by using the one step elastic finite element analysis. In addition, mesh generation algorithm is suggested which can be used in the general trimmed surface. In order to verify the validity of the proposed method, various examples including actual automobile sheet metal parts are given and discussed.

The analysis of the shift transient characteristics for the Ravigneaux type automatic transmission (라비뇨방식 유성기어를 채택한 자동변속기의 변속과도특성 해석)

  • Kim, I.C;Yi, S.J
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.21 no.11
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    • pp.1943-1949
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    • 1997
  • In this paper, the analysis of the shift transient characteristics for the Ravigneaux type automatic transmission has been carried out using dynamic models of the automatic trnasmission. It is necessary to understand the overall system including multi-plate clutch, band brake, one way clutch, and planetary gears. The equations of motion are derived from the dynamic models of the automatic transmission. The GUI computer simulation program has been developed to analyze the shift transient characteristics of the vehicle equipped with the Ravigneaux type automatic transmission.

Avoiding Automatic Android App Analysis by Detecting Random Touch Generation (무작위 터치 발생 탐지를 이용한 안드로이드 앱 자동 분석 회피에 관한 연구)

  • Yun, Han Jae;Lee, Man Hee
    • Convergence Security Journal
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    • v.15 no.7
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    • pp.21-29
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    • 2015
  • As the number of malicious Android applications increases rapidly, many automatic analysis systems are proposed. Hoping to trigger as many malicious behaviors as possible, the automatic analysis systems are adopting random touch generation modules. In this paper, we propose how to differentiate real human touches and randomly generated touches. Through experiments, we figured out that the distance between two consecutive human touches is shorter than that of random generation module. Also we found that the touch speed of human is also limited. In addition, humans rarely touch the outer area of smartphone screen. By using statistics of human smartphone touch, we developed an algorithm to differentiate between human touches and randomly generated touches. We hope this research will help enhance automatic Android app analysis systems.

Two Dimensional Automatic Quadrilateral Mesh Generation for Metal Forming Analysis (소성 가공 공정 해석을 위한 2차원 사각 요소망 자동 생성)

  • Kim, Sang-Eun;Yang, Hyun-Ik
    • Korean Journal of Computational Design and Engineering
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    • v.14 no.3
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    • pp.197-206
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    • 2009
  • In a finite element analysis of the metal forming processes having large plastic deformation, largely distorted elements are unstable and hence they influence upon the result toward negative way so that adaptive remeshing is required to avoid a failure in the numerical computation. Therefore automatic mesh generation and regeneration is very important to avoid a numerical failure in a finite element analysis. In case of generating quadrilateral mesh, the automation is more difficult than that of triangular mesh because of its geometric complexity. However its demand is very high due to the precision of analysis. Thus, in this study, an automatic quadrilateral mesh generation and regeneration method using grid-based approach is developed. The developed method contains decision of grid size to generate initial mesh inside a two dimensional domain, classification of boundary angles and inner boundary nodes to improve element qualities in case of concave domains, and boundary projection to construct the final mesh.

Thermal Analysis of Mg Hydride by Sievert's Type Automatic Apparatus (Sievert's type 자동장치에 의한 마그네슘 수소화합물의 열분석)

  • Han, Jeong Seb;Park, Kyung Duck
    • Korean Journal of Metals and Materials
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    • v.48 no.12
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    • pp.1123-1129
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    • 2010
  • In order to apply the Sievert's type automatic apparatus to thermal analysis of hydrogen absorbing materials, the dehydrogenation of the Mg-H system was investigated. As the initial wt% of hydrogen was increased to 4.4, the peak temperature of evolution rate shifted to higher temperature. However, with the initial wt% of hydrogen higher than 4.4, peak temperature of evolution rate did not change. The peak temperatures of evolution rate obtained by automatic apparatus were almost the same as those measured by a manual apparatus. As the heating rate was increased, the peak temperatures increased; the peak temperatures for heating rates 1, 2 and 3 K/min were 664, 687 and 702 K, respectively. The activation energy for the decomposition of Mg hydride was 101 kJ/mol. The Sievert's type automatic apparatus can be successively applied to the thermal analysis of metal hydride.