• Title/Summary/Keyword: Inspection station

Search Result 137, Processing Time 0.032 seconds

Trajectory analysis of a CubeSat mission for the inspection of an orbiting vehicle

  • Corpino, Sabrina;Stesina, Fabrizio;Calvi, Daniele;Guerra, Luca
    • Advances in aircraft and spacecraft science
    • /
    • v.7 no.3
    • /
    • pp.271-290
    • /
    • 2020
  • The paper describes the analysis of deployment strategies and trajectories design suitable for executing the inspection of an operative spacecraft in orbit through re-usable CubeSats. Similar missions have been though indeed, and one mission recently flew from the International Space Station. However, it is important to underline that the inspection of an operative spacecraft in orbit features some peculiar characteristics which have not been demonstrated by any mission flown to date. The most critical aspects of the CubeSat inspection mission stem from safety issues and technology availability in the following areas: trajectory design and motion control of the inspector relative to the target, communications architecture, deployment and retrieval of the inspector, and observation needs. The objectives of the present study are 1) the identification of requirements applicable to the deployment of a nanosatellite from the mother-craft, which is also the subject of the inspection, and 2) the identification of solutions for the trajectories to be flown along the mission phases. The mission for the in-situ observation of Space Rider is proposed as reference case, but the conclusions are applicable to other targets such as the ISS, and they might also be useful for missions targeted at debris inspection.

Centrifuge-Shaking Table Test for Seismic Performance Evaluation of Subway Station (지하역사의 내진성능평가를 위한 원심모형 진동대 시험)

  • Kim, Jin Ho;Shin, Min Jung
    • Journal of the Korea institute for structural maintenance and inspection
    • /
    • v.15 no.3
    • /
    • pp.99-105
    • /
    • 2011
  • When a certain magnitude earthquake occurs, serious damage for human and properties is a major concern for most of the subway stations which were not applied for earthquake resistant design. Consideration and experimental verification for ground and structural behavior based on soil-structure interaction relation are required to evaluate seismic performance of the subway station as embedded structures. For 1/60 scaled subway station model, centrifuge modeling shaking table test is performed using Kobe and Northridge earthquakes. Compare to displacements and moments of the underground and structure obtained by soil response analysis and response displacement method based on experimental results, this paper shows how to evaluate seismic performance of subway station.

A Study on Development of Interlocking Inspection System for Electronic Interlocking System (전자연동장치의 연동검사시스템 개발)

  • 박영수;이기서
    • Journal of the Korean Society for Railway
    • /
    • v.5 no.2
    • /
    • pp.104-111
    • /
    • 2002
  • The purpose of interlocking system was to prevent the route for a train being set up and its protecting signal cleared if there was already another, conflicting route set up and the protecting signal for that route cleared. This paper proposed Interlocking Inspection System(IIS) consisting of interlocking simulator and field simulator to operate interlocking test of computer based Electronic Interlocking System(EIS) in this paper. Interlocking simulator consists of Design Edit System(DES), Logical Database Management Tool(LDMT) and real-time confirming system, field simulator is a equipment to simulate a control object of EIS and constitutes configuration operated in 19 inch standard rack. As a result of test to prove capacity of this IIS, the efficiency was shown as excellent. Therefore by using inspection system, we obtain every advantages. It has the functions for test data generation and automatic test execution based on personal computer. Time and cost for test work can be reduced more efficiently by using this developed inspection system

Studies on the Milling, Quality and Storage of Tongil Rice Part I. Milling Condition and Change of Constituent of Rice (통일벼의 도정과 품질 및 저장에 관한 연구 제1보 도정공정과 성분변화)

  • Chung, Dong-Hyo;Kyung, Moon-Hyun;Kong, Joon-Sup;Kim, Hi-Kap
    • Korean Journal of Food Science and Technology
    • /
    • v.8 no.1
    • /
    • pp.1-5
    • /
    • 1976
  • 1. In the milling process of Tongil rice (brown rice), the milling rate was remarkable at 960 rpm. (rotation per minute), roller mesh of 36 and opening rate of 90%, but the milling ability was found to be best at 1050 rpm., roller mesh of 40 and at opening rate of 100%. 2. The protein content of Tongil rice was 1% higher than the other existing variety. 3. The contents of protein, ash, fiber, vitamin $B_1$ and vitamin $B_2$ varied significantly according to the milling degrees. As an example, at the milling degree of 70%, it was possible to reduce the losses of more than 10% in protein, of more than 30% in vitamin $B_1$, of more than 20% in vitamin $B_2$, as compared to the percentage losses obtained at the milling degree of 100%.

  • PDF

Point Cloud-based Automated Building Tilt Measurement (포인트 클라우드 기반 건축물 기울기 측정 자동화)

  • Dayoung Yu;Chaeeun Lee;Sung-Han Sim
    • Journal of the Korea institute for structural maintenance and inspection
    • /
    • v.27 no.5
    • /
    • pp.84-88
    • /
    • 2023
  • This study proposes an automated tilt measurement method using point cloud for buildings. The proposed method consists of two main steps: 1) exterior wall plane extraction, and 2) edge estimation and angle calculation. To validate the performance of the proposed method, the algorithm is applied to a target building, of which the estimated tilt values are compared with those obtained from a total station, a commonly used tool for tilt measurement. The result shows that most estimated tilt values are within the maximum and minimum ranges of the total station measurement, suggesting that the proposed algorithm provides sufficient measurement accuracy. Furthermore, the proposed method is shown to be automated and reliable as well as free from human-induced errors compared to the total station.

Design and Implementation of 30" Geometry PIG

  • Kim, Dong-Kyu;Cho, Sung-Ho;Park, Seoung-Soo;Yoo, Hui-Ryong;Park, Yong-Woo
    • Journal of Mechanical Science and Technology
    • /
    • v.17 no.5
    • /
    • pp.629-636
    • /
    • 2003
  • This paper introduces the developed geometry PIG (Pipeline Inspection Gauge), one of several ILI (In-Line Inspection) tools, which provide a full picture of the pipeline from only single pass, and has compact size of the electronic device with not only low power consumption but also rapid response of sensors such as calipers, IMU and odometer. This tool is equipped with the several sensor systems. Caliper sensors measure the pipeline internal diameter, ovality and dent size and shape with high accuracy. The IMU (Inertial Measurement Unit) measures the precise trajectory of the PIG during its traverse of the pipeline. The IMU also provide three-dimensional coordination in space from measurement of inertial acceleration and angular rate. Three odometers mounted on the PIG body provide the distance moved along the line and instantaneous velocity during the PIG run. The datum measured by the sensor systems are stored in on-board solid state memory and magnetic tape devices. There is an electromagnetic transmitter at the back end of the tool, the transmitter enables the inspection operators to keep tracking the tool while it travels through the pipeline. An experiment was fulfilled in pull-rig facility and was adopted from Incheon LT (LNG Terminal) to Namdong GS (Governor Station) line, 13 km length.

Forecasting of Inspection Demand for Pressure Vessels in Hydrogen Fuel Cell Electric Vehicle using Bass Diffusion Model (Bass 확산모델을 이용한 수소전기차 내압용기 검사수요 예측)

  • Kim, Ji-Yu;Kim, Eui-Soo
    • Journal of the Korean Institute of Gas
    • /
    • v.25 no.3
    • /
    • pp.16-26
    • /
    • 2021
  • The global warming problem has arose, the supply eco-friendly vehicles such as HFCEVs is increasing around world and Korea is fully supporting subsidies, tax cut to form an initial market for HFCEVs. The key to the safety of HFCEVs is pressure vessels stored hydrogen, and although these pressure vessels must be inspection regularly, the existing inspection stations are insufficient to meet the demand for inspection. Therefore, it is important to establishment of pressure vessels inspection station for safety management of HFCEVs. In this study, it estimates innovation coefficient, imitation coefficient in Bass model by using electric vehicle sales data, and foretasted the supply of HFCEVs by region & the demand for inspection by region using the Bass diffusion model. As a result, the inspection demand for pressure vessels in HFCEVs in 2040 was 690,759 units, and it was confirmed 191 new inspection stations and 1,124 inspectors were needed to prepare for this.

A Study on Analysis of Influx Path and Ingredient of Sedimentation Substance in Tunnel Drainage System (터널 배수시설에 유입된 침전물의 유입경로 및 성분분석 연구)

  • Woo, Jong-Tae;Yoo, Sang-Geon
    • Journal of the Korea institute for structural maintenance and inspection
    • /
    • v.8 no.4
    • /
    • pp.145-152
    • /
    • 2004
  • Red sedimentation substance contains large portion of Fe. The earth retaining structure of a tunnel and ground water containing more portion of Fe than other area are the major factor of this substance In case of white sedimentation substance, the most frequently founded ingredient is CaO, which is occurred in case grouting injection materials for ground reinforcement is transmitted into a tunnel system by ground water. This substance is doesn't affect safety of a tunnel Black sedimentation substance is often found in tunnels near station. This substance is a mixture of either white or red sedimentation substance and detergent material in station transmitted to a tunnel drainage system.

E-quality control: A support vector machines approach

  • Tseng, Tzu-Liang (Bill);Aleti, Kalyan Reddy;Hu, Zhonghua;Kwon, Yongjin (James)
    • Journal of Computational Design and Engineering
    • /
    • v.3 no.2
    • /
    • pp.91-101
    • /
    • 2016
  • The automated part quality inspection poses many challenges to the engineers, especially when the part features to be inspected become complicated. A large quantity of part inspection at a faster rate should be relied upon computerized, automated inspection methods, which requires advanced quality control approaches. In this context, this work uses innovative methods in remote part tracking and quality control with the aid of the modern equipment and application of support vector machine (SVM) learning approach to predict the outcome of the quality control process. The classifier equations are built on the data obtained from the experiments and analyzed with different kernel functions. From the analysis, detailed outcome is presented for six different cases. The results indicate the robustness of support vector classification for the experimental data with two output classes.