• Proceedings of the Korean Society of Precision Engineering Conference
• /
• 2001.04a
• /
• pp.613-617
• /
• 2001

The test items like as endurance, air leakage and oil endurance test is requested for reliability evaluation about O-ring which is a kind of core machinery accessories of semi-conduct manufacturing equipment. For verification of these, we design and manufactured a test system for endurance, air leakage and oil endurance of O-ring for semi-conduct manufacturing equipment, and also performed the test for two kinds of O-ring, as it were Viton and Kalretz. The characteristics of this test equipment consist in realization of the test conditions of semi-conduct manufacturing equipment and satisfying the test method. The test conditions are cut gas, vacuum grade, temperature and revolution numbers in the endurance test system, vacuum grade and temperature in the air leakage test system, temperature and time in the oil endurance test system. The separating test results for wearing which is an oil endurance test item, the wearing index of domestic produced Viton O-ring is higher than foreign product by 2%, wearing rate of Kalretz O-ring better than Viton O-ring by 17%, and particles existed in various place. The test result of air leakage which is measured through the RGA sensor used Helium, the vacuum grade was $10^-3$Torr. And the test result of oil endurance, the volume change rate was 7~15%. Hereafter, we intend to analysis the reliability test evaluation and to utilize for domestic manufacturing companies by establishing data base and developing reliability softwares.

• Journal of the Korea Institute of Military Science and Technology
• /
• v.16 no.6
• /
• pp.771-778
• /
• 2013

Transmission is a core component of helicopter to transmit power from engine to rotor and must have a endurance to be able to show satisfactorily its performance required during its life time. When developing a new helicopter, both military and civil airworthiness authorities require a tie-down test to verify its endurance. Procedure for transmission endurance test is described in FAR part 29 or US military specification but its details are more or less ambiguous. In this paper, we have proposed a proper procedure for transmission endurance test by giving KUH transmission endurance test example including determination of applicable torque, load and test profile.

• Journal of the Korean Society of Physical Medicine
• /
• v.5 no.1
• /
• pp.7-13
• /
• 2010

The purpose of this study was to evaluate the influence of cervical ROM and muscle endurance on cervical joint mobilization of normal adults. Both joint mobilization group(n=20) and control group(n=20) were measured an cervical ROM and muscle endurance time by CROM and stop watch at pre-test, post-test in 1 weeks, post-test in 2 weeks and post-test in 3 weeks. The flexion ROM, extension ROM and muscle endurance of the joint mobilization group were significantly different among the experimental period (p<.05). The Correlation of muscle endurance and extension ROM is significantly Correlation (p<.05). In conclusion, we were found that cervical joint mobilization could increase cervical ROM and muscle endurance and Correlation of muscle endurance and extension ROM.

• Proceedings of the KSR Conference
• /
• 2002.05a
• /
• pp.336-343
• /
• 2002

This paper describes the result of endurance test on the Sangju test track. The purpose of the test is to prove the endurance of the Korean EMU for the commercial operation. Test conditions are more severe than actual operation on the commercial line. But endurance test come to an end well without severe problem. Hereafter, Korean EMU will be applied the quality certification of railroad supplies as a testing vehicle and their components will be applied in a new line.

• Journal of the Korea Institute of Military Science and Technology
• /
• v.21 no.5
• /
• pp.614-622
• /
• 2018

Based on army operating road profile, the endurance test of military vehicle aims to reproduce the similar loading conditions with mixture of proving ground tracks. It is so called as endurance test mode and its optimal generation is important to meet high reliability of endurance test. In this paper, proving ground optimization is proposed to achieve a close match to the target profile. Several performance measures such as torque-revolution counts or transmission ratio for the powertrain system can be considered as one of the objective functions. However, the one-side optimal endurance test mode may give the poor solution in the whole system point of view. To incorporate several goals simultaneously, this paper employs multi-objective optimization technique to generate endurance test mode. One of the most widely used method, weighted-sum method is applied here and the case study is discussed.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
• /
• 2014.10a
• /
• pp.256-261
• /
• 2014

Endurance test procedures of multipurpose tactical vehicle is constructed by comparing the Korea defence standard and TOP-2-2-506. The plan was to make the best reflect the operational environment and the actual production purposes. Endurance test of multipurpose tactical vehicle more stringent than the existing other military vehicles validation procedures. But the test plan, it is possible to reduce the cost and schedule of long verification that occurs because of the Endurance test. Through a comparison of the dynamic characteristic analysis, change of test center was to ensure the reliability and validity.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
• /
• 2004.05a
• /
• pp.931-936
• /
• 2004

In this paper, vibration endurance test is carried out on rubber insulators used fur vehicle air cleaners. Based on the test results, endurance characteristics depending on type and material of the insulators are estimated. Frequency response characteristics of the air cleaner system are investigated to identify the cause of wear and failure in the insulators occurred during the endurance test. New insulator models with improved endurance characteristics are proposed by changing the frequency response property of the air cleaner system.

• Transactions of the Korean Society for Noise and Vibration Engineering
• /
• v.14 no.9 s.90
• /
• pp.897-902
• /
• 2004

In this paper, a vibration endurance test is performed on rubber insulators used for vehicle air cleaners. Based on the test results, the endurance characteristics depending on the type and the material of the insulators are estimated. The frequency response characteristics of the air cleaner system including the insulator are investigated to identify the cause of wear and failure of the insulator. New insulator models with improved endurance characteristics are proposed and tested. Test results show that the vibration endurance property of the insulator is strongly dependent on the frequency response characteristics of the air cleaner system as well as the deformed shape of the insulator.

• Journal of Aerospace System Engineering
• /
• v.1 no.3
• /
• pp.13-20
• /
• 2007

The objective of this study is to investigate endurance test of localization part for T-50 aircraft engine. Major localization parts of the engine (F404-STW-102) was performed using Accelerated Simulated Mission Engine Test. The purpose of this test is to evaluate of quality demonstration capability, to verify design of engine localization parts, and to improvement safety and operation rate of T-50 advanced trainer by finding out operational problems in production phase and fixing it.

• Journal of KSNVE
• /
• v.9 no.6
• /
• pp.1166-1172
• /
• 1999

This paper is the experimental study on the endurance characteristics of the dynamic absorber for the vibration reduction of the 4WD(4 Wheel drive) vehicle's powertrain. Employing the vehicle speed, natural frequencies of damper, modal testing results of powertrain and the weighting factor, the improved endurance test conditions are suggested to enlarge the life time of the dynamic absorber. The test results show that the life time of the dynamic absorber for Z-direction(up and down) has no problems, but the characteristics of X-direction (fore and after) will be sensitive to endurance characteristics of dynamic absorber.