• 제목/요약/키워드: computer-simulation

검색결과 12,248건 처리시간 0.04초

A Study of Vehicle Fuel Consumption Simulation using VHDL-AMS Multi-domain Simulation

  • Abe, Takashi;Takakura, Shikoh;Higuchi, Tsuyoshi
    • Journal of international Conference on Electrical Machines and Systems
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    • 제2권2호
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    • pp.232-238
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    • 2013
  • The vehicle system is a multi-domain system that requires many branches of science and engineering. Therefore the development of the vehicle system requires the use of design methodologies that utilize simulations, which have grown increasingly sophisticated in recent years. Our research group proposed a simulation modeling method based on the VHDL-AMS language. This paper describes how VHDL-AMS is used to model of vehicle fuel consumption simulation. The fuel consumption is shown using proposed simulation model on the Japanese 10-15 mode. We examine the influence of the vehicle system with electrical load and hill climb resistance in the vehicle running resistance.

시뮬레이션 기법을 이용한 컨테이너 터미날의 운영시스템 결정 (Determination of Container Terminal Operating System Using Computer Simulation)

  • 장성용;박진우
    • 산업공학
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    • 제1권1호
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    • pp.49-62
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    • 1988
  • This paper deals with the case study that determines the best operating system of a container terminal using computer simulation techniques. For the simulation, SIMAN simulation language is used. The simulation model developed circumvents the dimensional restrictions imposed by the SIMAN package. Non-terminating simulation experiments are conducted for the 90 days' work on the basis of operation practices of real terminals.

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An Estimation of The Unknown Theory Constants Using A Simulation Predictor

  • 박정수
    • 한국시뮬레이션학회논문지
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    • 제2권1호
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    • pp.125-133
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    • 1993
  • A statistical method is described for estimation of the unknown constants in a theory using both of the computer simulation data and the real experimental data, The best linear unbiased predictor based on a spatial linear model is fitted from the computer simulation data alone. Then nonlinear least squares estimation method is applied to the real experimental data using the fitted prediction model as if it were the true simulation model. An application to the computational nuclear fusion devices is presented, where the nonlinear least squares estimates of four transport coefficients of the theoretical nuclear fusion model are obtained.

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정밀냉간단조에 의한 엔진오일 누수방지용 자동차부품 개발 (Development of the Automobile Part for the Engine Oil Leakage Prevention by the Precise Cold Forging)

  • 권혁홍;이봉규
    • 소성∙가공
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    • 제14권8호통권80호
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    • pp.675-680
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    • 2005
  • This study was aimed at the design of the dies for the automobile part for the engine oil leakage prevention using the computer simulation to shorten the period of production, on the basis of the process planning which was designed by the field experts. In the computer simulation,'eesy-2-form' of 2D FEM simulation package and 'eesy-DieOpt' have been used, which are the commercial process analysis and die design program. Through the simulation of 'eesy-2-form', we could know the propriety of the forming process, the inner pressure of the die and the suitable fitting pressure between the insert and the sleeve which was not showing any positive tangential stresses in the insert. Through the simulation of 'eesy-DieOpt', we could know the number of the stress ring, the diameter ratios, the stresses of the die, the shrink fitting tolerance and temperature in the condition of the already determined maximum outer die diameter of the multi-stage former. The validity of the die design using the computer simulation was analyzed by the experiments and the results were satisfactory. As the results of this study, the new and easy die design system for cold forging has been developed.

Use of the surface-based registration function of computer-aided design/computer-aided manufacturing software in medical simulation software for three-dimensional simulation of orthognathic surgery

  • Kang, Sang-Hoon;Lee, Jae-Won;Kim, Moon-Key
    • Journal of the Korean Association of Oral and Maxillofacial Surgeons
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    • 제39권4호
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    • pp.197-199
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    • 2013
  • Three-dimensional (3D) computed tomography image models are helpful in reproducing the maxillofacial area; however, they do not necessarily provide an accurate representation of dental occlusion and the state of the teeth. Recent efforts have focused on improvement of dental imaging by replacement of computed tomography with other detailed digital images. Unfortunately, despite the advantages of medical simulation software in dentofacial analysis, diagnosis, and surgical simulation, it lacks adequate registration tools. Following up on our previous report on orthognathic simulation surgery using computer-aided design/computer-aided manufacturing (CAD/CAM) software, we recently used the registration functions of a CAD/CAM platform in conjunction with surgical simulation software. Therefore, we would like to introduce a new technique, which involves use of the registration functions of CAD/CAM software followed by transfer of the images into medical simulation software. This technique may be applicable when using various registration function tools from different software platforms.

3 Dimensional Computer Simulated Cutting Guide for the Mandibuloplasty : A Preliminary Case Report

  • Choi, Jong-Woo;Jeong, Woo Shik;Oh, Tae Suk
    • Journal of International Society for Simulation Surgery
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    • 제2권2호
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    • pp.80-82
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    • 2015
  • The mandibuloplasty for the facial aesthetic reason has been the one of the most popular procedures in aesthetic facial bone surgery in East Asia. Most East Asian women prefer smaller-looking and smooth-shaped facial contour. Prominent mandible angle which are common in Asia would be the main problem for smooth facial contour. In addition, recently, the mandibular body and broad chin shape also are known to be remodeled in order to get the ideal smooth facial shape. However, mandibuloplasty is not that easy to cut because many patients has inward mandibular angle and the visual field in operation is limited. The aim of this trial is to try to provide the prefabricated cutting guide for the symmetric and appropriate mandibuloplasty with the surgeons. Preoperative computed tomography(CT) data were processed for the patient and computer simulation model was produced. Then, mandibuloplasty was done on the computer simulation screen. Based on this data, customized cutting guide was made. This prefabricated cutting guide was used in real mandibuloplasty bilaterally. Premade cutting guide for the mandibuloplasty based on the computer simulation turned out to be very successful in this patient. Individualized approach for each patient could be an ideal way to manage the patients in near future.

함정용 전술 컴퓨터 콘솔의 방진 (Isolation Mount Design for the Combat Computer Console Installed in Surface Ship)

  • 권병현;김준;김진천;서송호
    • 한국소음진동공학회:학술대회논문집
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    • 한국소음진동공학회 2000년도 춘계학술대회논문집
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    • pp.1772-1777
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    • 2000
  • The Combat Computer Consoles installed in surface ships should endure harsh environment such as vibration from engine or propeller and shock from underwater explosion. Generally, commercial isolation mounts are selected and used for anti-vibration and anti-shock design. In this research, the environment of the Combat Computer Console was analyzed first. Selected proper mount was modeled and computer simulation was performed to emulate the environment test. The real environment test was conducted with a manufactured Combat Computer Console. The test results were same as the simulation and satisfied the performance requirements. The computer simulation proved to be a useful design tool to predict the performance before the final environment test.

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트랙터의 전자 유압식 히치 제어 시스템에 관한 연구 (III) -컴퓨터 시뮬레이션- (Electronic-Hydraulic Hitch Control System for Agricultural Tractors (III) -Computer Simulation-)

  • 김기영;류관희;유수남
    • Journal of Biosystems Engineering
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    • 제15권4호
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    • pp.290-297
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    • 1990
  • The purposes of this study were to perform theoretical analysis of an electronic-hydraulic hitch control system for position and draft control of tractor implements and to investigate the performance of the control system through computer simulation. Computer simulation models which could predict the responses of the system to the step and sinusoidal inputs in position and draft controls were developed using the simulation package "TUTSIM". The effects of control mode, hydraulic flow rate, deadband, and proportional constant on control performance of the system were investigated. The simulated results were compard with the experimental ones to verify the simulation models. The simulation models appeared to be a useful means for the analysis and the design of the electronic-hydraulic hitch control system.

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고분자 분리막 연구를 위한 전산모사 도구 소개 (Review on the Computer Simulation Tools for Polymeric Membrane Researches)

  • 최찬희;박치훈
    • 멤브레인
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    • 제30권4호
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    • pp.242-251
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    • 2020
  • 고분자 소재 및 이를 이용하여 제조된 분리막에 주로 활용되는 전산모사 도구들은 모사대상의 크기 및 모사하고자 하는 시간에 따라 여러 가지 분야로 나뉘어진다. 본 총설에 소개되는 전산모사는 그 중에서 전산재료화학에 주로 사용되는 양자역학(quantum mechanics; QM), 분자동역학(molecular dynamics; MD), 메조스케일 전산모사(mesoscale modelling), 이렇게 3가지로 분류된다. 고분자 연구에서 사용되는 전산모사는 각각의 전산모사의 종류마다 연구내용이 달라지는데, 양자역학은 분자, 원자, 전자 등 미시적인 계의 현상을 다루어 작은 크기의 현상을 연구하고, 분자동역학은 원자들 사이의 퍼텐셜 또는 힘이 주어졌을 때 뉴턴의 운동방정식에 따른 원지 및 분자의 움직임을 수치적으로 풀어내고, 메조스케일 모델링은 원자들을 묶어서 그룹형태로 만들어 비드를 형성해 비교적 큰 분자량에서 계산시간을 줄여 거시적으로 판단하는 연구가 된다. 본 총설에서는 고분자 및 고분자 분리막에 주로 활용되는 다양한 전산모사 프로그램을 위에서 분류한 3가지 종류로 나누어 각각의 특징과 사용분야 등을 소개하고자 한다.