• Title/Summary/Keyword: Running test

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An Experimental Study on the Motion Response of a High-Speed Planing Craft in Regular Head Waves (정면 규칙파 중 활주형 고속선의 운동 응답에 대한 실험적 연구)

  • Kim, Dong-Jin;Rhee, Key-Pyo;Hwang, Seung-Hyun;Park, Han-Sol
    • Journal of the Society of Naval Architects of Korea
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    • v.46 no.4
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    • pp.373-381
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    • 2009
  • The running attitude of a high-speed planing craft may change significantly depending on its speed in seaway. Other variables that may influence its running attitude are its weight, center of gravity, sea conditions, and so on. In this paper, planing craft model tests were carried out with respect to above variables in SNU towing tank, and vertical motion responses of a planing craft in regular head waves were analyzed. The experimental results in regular waves were compared with those in calm water, and compared with the theoretical estimations. Finally, the effects of running speeds of a planing craft on its motion amplitudes are confirmed.

A Study on the Improvement of Driving of Educational Robots with OID Sensors (OID센서로 주행하는 교육용 로봇의 주행 개선을 위한 연구)

  • Song, Hyun-Joo
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.25 no.4
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    • pp.549-557
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    • 2021
  • In this research, we will use the existing OID sensor environment for smart robots, which are a type of educational robot, but we would like to propose that the problem of running be handled by a program. Maybe you have driving information We are building a driving test environment focusing on environment, position recognition, route planning, obstacle avoidance and path reset, and it is not the average final error rate, but the time when the error increases The experiment was conducted by a household that catches the moment of recalibration. Through the process, stable running results were obtained compared to the previous experiment. In this research, I think that it will be a development method that can improve the running performance of educational robots equipped with low-cost sensors currently on the market.

An execution of the performance test for EMU (도시철도차량의 성능시험 시행 및 현황)

  • 김원경;정종덕;홍용기;김명룡;배창한
    • Proceedings of the KSR Conference
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    • 2002.10a
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    • pp.131-136
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    • 2002
  • Performance test is carried out in accordance with "performance test standard for Electrical Multiple Unit", noticed by Ministry of Construction & Transportation in 2000. The object of this standard is to ensure that vehicle is tested after completion and before entry into service. Performance test is classified by type test to be carried out for the first car and its components in order to verify their performance and by routine test to be carried out on the whole quantity in order to prove the performance of individual items. Scope of the test is divided by components, completed car, preliminary adjustment test and running test on main line. The paper introduces a testing procedure and an execution method of the performance test.

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Risk-based Test Case/Test Set Value Estimation Model (리스크 기반 테스트 케이스/테스트 세트 가치 추정 모델)

  • Kwon, Won-Il;Kim, Jong-Ku;Kwon, Ho-Yeol
    • Journal of Industrial Technology
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    • v.32 no.A
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    • pp.125-128
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    • 2012
  • In this paper, we proposed a prioritization method of test cases using a value estimation model of test sets, that are key elements for highly effective software testings as well as involve a large cost factor in software developments and maintenances. Based on previous studies, our idea includes introducing some practical factors of the test case prioritization which critically influence the value of a test case: Relative values of test sets before and after the test running, Average value of these two relative values, Severity of the defect, Risks that are covered, Frequency of use, Change related values, Systematic elicitations, etc. Finally we discussed the usefulness and the expected effects of the proposed scheme.

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Characteristics and Influencing Factors of Red Light Running (RLR) Crashes (신호위반사고의 특성과 영향요인 분석)

  • Park, Jeong Soon;Jung, Yong Il;Kim, Yun Hwan
    • Journal of Korean Society of Transportation
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    • v.32 no.3
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    • pp.198-206
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    • 2014
  • According to the statistics of the National Police Agency, red light running (RLR) crashes represent a significant safety issue throughout Korea. This study deals with the RLR crashes occurred at signalized intersections in Cheongju. The objectives of this study are to comparatively analyze the characteristics of between RLR crashes and the Non-RLR crashes, and to find out factors using a Binary Logistic Regression(BLR) model. In pursuing the above, the study gives particular attentions to testing the differences between the above two groups with the data of 2,246 RLR/ 3,884 Non-RLR crashes (2007-2011). The main results are as follows. First, many RLR crashes were occurred in the nighttime and in going straight. Second, the difference between RLR and Non-RLR crashes were clearly defined by crash type, maneuver of vehicle before crash, age of driver (30s, 50s), alcohol use and accident pattern. Finally, a statistically significant model (Hosmer and Lemeshow test : 7.052, p-value : 0.531) was developed through the BLR model.

Development of Ship Dynamics Model by Free-Running Model Tests and Regression (자유항주모형시험과 회귀분석을 통한 선체 동역학 모델의 개발)

  • Kim, Kiwon;Kim, Hoyong;Choi, Sungeun;Na, Ki-In;Lee, Hyuk;Seo, Jeonghwa
    • Journal of the Society of Naval Architects of Korea
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    • v.59 no.3
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    • pp.173-182
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    • 2022
  • The present study suggests a procedure of establishing a ship dynamics modeling by regression of free-running model test results. The hydrodynamic force and moment of the whole model ship is derived from the low-pass filtered acceleration in the turning circle and zigzag maneuver tests. Force and moment of the propeller and rudder are separated from that of the whole ship to acquire the hull force and moment terms, based on the principles of the component model. The low-pass filter frequency is verified in prior to dynamics modeling, to find the threshold frequency of 2.5 Hz. The dynamics modeling of the hull is compared with the component modeling by captive model tests. Because of strong correlation between sway velocity, yaw angular velocity, and heel angle, each maneuvering coefficient is not able to be validated, but the whole modeling shows good agreement with the captive model tests.

A Study on the High-Speed Rotor-Bearing System with SFD (스퀴즈-필름 댐퍼를 이용한 회전축 베어링계의 고속화 연구)

  • 한동철;윤석철
    • Tribology and Lubricants
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    • v.5 no.2
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    • pp.101-106
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    • 1989
  • Various squeeze film dampers have been theoretically and experimentally studied for flexible rotors. A cylindrical bush damper among them was selected and applied in a test rotor supported with ball bearings. A quiet running of the rotor over a critical speed was observed.

A Study on Traction Characteristics of KTX (KTX차량 견인특성에 관한 연구)

  • 한영재;김석원;최강윤;조민삼;최성균;최종선;김정수
    • Proceedings of the KSR Conference
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    • 2003.10a
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    • pp.175-180
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    • 2003
  • In this paper, we is studied for traction performances of KTX. Main transformer of this train are compose of 3 motor blocks. In order to this test is developed measurement system. Using this system, we obtained important result for running speed, acceleration, axle speed, transformer oil temperature.

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An Experimental Study on the Pump Operating Characteristics with Low Flow Operation (펌프의 저 유량 운전특성에 관한 실험적 연구)

  • 오광석;신필권;박종호;심우건;조두연
    • Journal of KSNVE
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    • v.9 no.1
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    • pp.85-96
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    • 1999
  • For ASME Code pumps in nuclear power plants, inservice test is required to assess the operational readiness in accordance with ASME code and related regulations. The objective of this study therefore, is to develop the technical background of the degradation of pump performances and conditions due to low flow rate operation. In addition. the detection techniques of pump operating conditions are to be developed to enhance the safety and economy of nuclear power plants. A test loop consisted of pump, motor. water tank, flow rate measurements and piping system with flow control devices was established for this study. Two typical pumps, 1-stage volute pump and 3-stage turbine pump, were selected and the test was performed upon two major point of views ; i.e., pump discharge pressure pulsations analysis and pump vibration spectrum analysis. From the test results, it is concluded that (1) the pump vibration affected by the natural frequency of operating pump is significant in the low frequency zone (around 1 Hz) : the vibration amplitude. especially. is an important factor during low flow rate operation. and shall be monitored to ensure that it is within the limit of ASME OM code Part 6, (2) the vibration frequency and pump discharge pressure are affected by vane pass frequency and running speed, (3) the wave phenomena due to the compressiblity of water is anticipated during low flow rate operation. and the pump system shall be designed to prevent it and. finally, (4) the technical background of the degradation of pump performances and conditions due to low flow rate operation is provided.

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