• Tribology and Lubricants
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• v.24 no.4
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• pp.170-178
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• 2008

In this paper, it is described how the problems appeared at the previous proto type sensor are improved. As changing the pressure and temperature of engine oil in a test rig, the modified sensor is tested. Then, the measured results of capacitance and the corresponding dielectric constants under various temperatures and pressures are shown. It turns out that the electrical signal gotten from the electrodes of newly developed sensor can be more stable under the various operating conditions.

• Journal of Korea Technical Association of The Pulp and Paper Industry
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• v.31 no.3
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• pp.19-25
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• 1999

Effects of the process variable in Condebelt press drying including drying temperature, pressure , drying time, and moisture content of the sheets on the paper properties were examined. The experiment was performed with a static rig and Korean OCC was used as raw material. Significant improvement in sheet density, compression strength, tensile strength, surface smoothness ,etc. was obtained when condebelt drying was applied. Control of pressure and inlet dryness was found to be two most critical variables in improving sheet properties.

• 연구논문집
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• s.23
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• pp.63-71
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• 1993

To improve flow in-cylinder flow in a 2-valve gasoline engine, various geometries of combustion chambers are modified. Air flow rate, swirl and tumble flow are measured and analyzed by swirl impulse meter and LDV in a steady state flow measuring rig. The results of LDV experiment are compared with the data of swirl impulse meter.

• 한국연소학회:학술대회논문집
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• 2012.11a
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• pp.287-289
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• 2012

The research and development history of the gas turbine combustor in Korea is introduced briefly. It is very important to understand the fuel spray, mixing phenomena in achieving combustion performance. In this paper, two kinds of fuel injection system such as duplex fuel injector and rotary spray system are introduced in developing gas turbine combustor in Korea. The extensive experimental research of fuel spray, ignition, performance and endurance rig test makes gas turbine combustor successfully in Korea.

• Tribology and Lubricants
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• v.11 no.1
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• pp.44-49
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• 1995

Friction characteristic of an engine crankshaft bearing is affected by revolution speed, applied loads, and viscosity of lubrication. So, experimental investigation is required to observe the friction characteristics using these factors. Hydraulic cylinder, servo controller system which can be modified the applied load, and test rig for the observation of the characteristics of engine crankshaft bearings were designed and fabricated, and some experiments were performed. Friction torque, journal locus and circumferential temperature variation of crankshaft bearing were measured according to applied load, revolution speed, and oil inlet temperature.

• Proceedings of the KSR Conference
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• 2000.11a
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• pp.476-483
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• 2000

Like other vehicles, the suspension elements of railway rolling stock have influence on running stability and ride quality. Thus, faults detection for suspension elements is important to prevent an accidents of train and to ensure safety against derailment. This study was started to grasp the feasibility of diagnostic method for the suspension elements of bogie without disassembling. Through several tests by running test rig, we found that fault detection for suspension elements was possible. Here, we describe some results.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2001.11a
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• pp.354-359
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• 2001

A flexible rotor was smoothly passed through its bending critical speed, which is supported by AFB. Then, maximum magnitude of the rotor vibration at the middle point was 25${\mu}$m. The test rig was largely consisted of air turbine, multi-leaf type air foil bearing and flexible rotor and its bending critical speed was 32,600 rpm. And the balancing system and method for field balancing of the flexible rotor were developd successfully.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 1992.04a
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• pp.390-394
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• 1992

This study is concerned with the hydraulic system for active suspension with a skyhook damper. The state variable equations of a sky-hook damper system are formulated forthe theoretical analysis, and the test rig of the syspension is constructed. The Simulation results show fair agreement with the experiment. It is found in the experiment that the suspension with the skyhook damper shows much better driving stability and ri ding comfort compared to that with the passive damper.

• Proceedings of the Korean Society of Tribologists and Lubrication Engineers Conference
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• 1993.12a
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• pp.57-62
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• 1993

To increase the fuel economy, a reduction of friction loss is important in engines. Experimental investigations have been required for reducing the friction loss of crankshaft bearings. Hydraulic cylinder, and servo control ler system which modified the applied load, and test rig for the observation of the characteristics of engine crankshaft bearings were designed and fabricated. Experiment is performed. Friction torque, journal locus and circumferential temperature variations of crankshaft bearings were measured with appling load, revolution speed, and oil inlet temperature, etc.

• Proceedings of the Korean Society of Tribologists and Lubrication Engineers Conference
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• 1998.10a
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• pp.30-37
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• 1998

It is well known that reduction of friction loss due to the valve train system greatly affects on improvement of fuel economy in internal combustion engine. In order to investigate friction characteristics of valve train system we carried out friction force measurement using test rig developed by ourselves. From test results, we concluded that characteristics of lubrication and friction torque on the valve train system such as mixed and hydrodynamic was mainly governed the contact type between cam and tappet.