• 한국추진공학회:학술대회논문집
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• 한국추진공학회 2004년도 제22회 춘계학술대회논문집
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• pp.573-576
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• 2004

KARI is achieving the KSLV program according to National Space Technology Development Program. In this paper, the authors are intended to introduce the Integrated Power Plant (abb. IPP) test facility which will be constructed for the variety of tests on KSLV program. IPP test facility refers to comprehensive testing equipment for liquid rocket launch vehicle. Using this facility, KARl can verify the adaptiveness of parts and subsystems for launch vehicle and finally can qualify the system characteristics of launch vehicle doing kinds of test including hot firing test. Using this facility, KARI can simulate the vehicle launching circumstances and it make to predict the performance of launch vehicle when its flight test.

• 한국신뢰성학회지:신뢰성응용연구
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• 제11권4호
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• pp.343-356
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• 2011

This paper proposes an accelerated life evaluation of drive shaft. The life test of drive shaft for independent suspension type AWD vehicle should be performed by use of the least test sample because many number of samples can't be used for the test because of its mass capacity and high price. We calculated the no failure test time by application of no failure test concept, and the already performed test data for drive shaft are applied for some kinds of reliability coefficients which are needed for calculation of life test time. And, for analysis of real driving condition of vehicle, the load spectrum is prepared using the needed road condition and vehicle data. The inverse power model is used for accelerated life test. The equivalent torque of load spectrum is achieved by use of Miner's Rule, and then the final accelerating condition is determined by decision of the accelerated test torque. This paper shows that the accelerated life test results corresponds with the target life and the proposed life test method can be very well applied to no failure life test for mass capacity machinery components.

• 항공우주기술
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• 제11권2호
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• pp.103-108
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• 2012

발사체의 신뢰성과 추진제 또는 가스의 누설은 매우 밀접한 상관관계를 갖는다. 본 논문에서는 누설에 대한 정성적인 분석을 위한 누설량의 정의와 각 단위계의 변환 관계를 소개하였다. 또한 누설량에 영향을 미치는 인자를 분석하였다. 발사체 기밀시험에 사용하는 가스의 품질 요구조건과 발사체 또는 부품의 기밀을 확인하기 위한 여러 가지 시험 방법을 소개하였다. 아울러 발사체의 추진시스템에 대한 기밀시험에서 사용된 방법과 절차를 간략히 기술하였다.

• 자동차안전학회지
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• 제10권1호
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• pp.12-19
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• 2018

This paper deals with the broadband electromagnetic emission test of a hybrid electric vehicle. The hybrid electric vehicle's powertrain system consists of an internal combustion engine and an EV traction motor. Depending on the SOC of the traction battery, these modes change automatically in the running state. The Korea electromagnetic compatibility regulations of KMVSS and UN WP.29 stipulated the evaluation method of hybrid electric vehicles. This study analyzes and compares two test results: internal combustion and electric motor mode. Some problems of test conditions are described and an improved test method is proposed for measuring broadband emissions of a hybrid electric vehicle. As a result, we expect this paper to be used as a consideration for improvement when test specifications are revised in the future.

• 한국분무공학회지
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• 제14권1호
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• pp.15-19
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• 2009

This paper is to investigated the analysis of performance characteristics of diesel oxidation catalyst (DOC) for diesel vehicle with 2.5L piston displacement. The performance evaluation test of DOC applied to test diesel vehicle was carried out for four kinds of DOCs manufactured from different company. The testing DOCs were randomly selected from the retrofit vehicle and then standard test vehicle that was representative for the application group was equipped with DOC for the test. In this verification test, the reduction rate of particulate matter (P.M.) and the deviation of the performance of the DOC were examined through CVS-75 mode of the standard vehicle and SOF reduction rate of specific DOC was investigated. It was found that some DOCs failed to pass the criteria of the P.M. reduction rate because of the reason seen catalyst aging even if they were same devices. In the result of SOF analysis, the specific DOC showed more PM reduction than SOF of PM. reduction exceptionally.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2014년도 추계학술대회 논문집
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• pp.587-588
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• 2014

Studies that the vehicle exhaust system applied by the TEG(thermal electric generator) are actively in progress in order to improve the fuel efficiency of the vehicle. Vehicle exhaust system is on a poor vibration condition, it is susceptible to TEG. This paper is about the development of vibration durability test of TEG mounted on a vehicle exhaust system. Vehicle driving tests are performed to measure the vibration condition of the vehicle exhaust system. The vibration durability test mode of TEG is evaluated using equivalent vibration energy method. The vibration durability tests of TEG are performed using the multi-axial vibration simulation table.

• 한국소음진동공학회논문집
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• 제15권12호
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• pp.1332-1339
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• 2005

The vibration of Powertrain are one of the import design characteristics of a vehicle. Powertrain is mostly mounted to the front subframe and powertrain mounting has an important role in determining the vehicle vibration characteristics. In this paper, the accuracy of the vibration analysis for the front subframe is discussed. The dynamic characteristic of subframe are measured from vehicle test and the finite element model updating are performed that natural frequency, mass and MAC of the experimental and theoretical modal analysis are compared. The subframe mounting stiffness are obtained the iteration method based on the vibration of subframe from vehicle test. Finally, the result of dynamic analysis which is operated dynamic load is compared with experimental one of vehicle test.

• 전기학회논문지
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• 제58권10호
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• pp.1962-1967
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• 2009

This paper deals with a design of a platform to simulate PRT vehicle operational control algorithms using on-board embedded process board. The configuration of the platform is composed of the central control module, the station control module, man-machine interface and monitoring module. Since PRT system needs inherently very reliable vehicle operational control algorithm in order to avoid the impact between vehicles, it is very important to construct a simulation platform to test a designed vehicle operational control algorithm during the development process For the test of the proposed platform a path of the each moving vehicle is predefined in the central control system before the dispatch order is given to the vehicle. The simulation results show the effectiveness of the proposed simulation platform for test and evaluation of the PRT operational control algorithms.

• 전기학회논문지
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• 제60권3호
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• pp.600-605
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• 2011

This paper shows field test and evaluation results for a wireless vehicle detector with anisotropic magneto-resistive (AMR) sensors. The detector consists of two AMR sensors and mechanical and electronic apparatuses. The AMR sensor senses disturbance of the earth magnetic field caused by a vehicle moving over the sensor and then produces an output indicative of the moving vehicle. In this paper, vehicle speeds are calculated by using two AMR sensors fixed on a board, with constant distance. To test and evaluate the accuracy of the detector in real traffic situations, the detector was installed on a local highway and vehicle speeds and volumes were measured both in a free running and a highly congested traffic. The measurements from the detector are compared with the reference measurements obtained from a traffic camera with the Mean Absolute Percentage Errors (MAPE), which has proved the usefulness of the detector in the field.

• 한국자동차공학회논문집
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• 제24권2호
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• pp.225-231
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• 2016

A military vehicle is driven at different usage modes with the army application and servicing conditions. For practical durability validation, DT(Development Test) on a new military vehicle should be run up to the durability target kilometers on test courses in the specified proving ground. Driving velocities with test courses at the endurance mode of DT are established definitely. However, OT(Operational Test) and initial endurance test of production car can't be performed only in the DT courses due to the development period limit. Therefore, this paper focuses on the method to analyze the relative road damages between the endurance test in DT and other endurance test. Road load acquisition tests on KLTV(Korean Light Tactical Vehicle) were implemented at 15 driving modes in off-road and cross-country courses of two tests. Wheel accelerations were processed through band-pass filter, and then the main frequency and maximum power of the signals were computed by PSD analysis. Finally, using the proving ground optimization based on RDS(Relative Damage Spectrum) characterization, the damage factors between off-roads of test courses were determined.