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Robust Vibration Control of Vehicle Seat Suspension System Using MR Damper
Chulhee Han(한철희),Do Kyun Shin(신도균),Cheol Soo Shin(신철수),Seung-Bok Choi(최승복) 한국소음진동공학회 2017 한국소음진동공학회 논문집 Vol.27 No.3
This work presents a semi-active seat suspension system using magnetorheological (MR) dampers to enhance the ride comfort of the driver of a commercial vehicle. After determining the required damping force for the seat damper based on the field-dependent yield stress of the MR fluid, the governing equation of the system is derived by integrating a human-body model. In order to reduce the degree of freedom of the full dynamic model, a balanced model reduction is used and the effectiveness of the reduced model is verified based on a comparison in the frequency domain. Subsequently, a new adaptive fuzzy sliding mode controller is developed and implemented to achieve favorable ride comfort of the driver. Control responses such as the acceleration and displacement of the seat are measured in both the time and frequency domains. It is demonstrated that the proposed MR seat suspension system can provide ride comfort that is superior to that of the passive seat suspension system.
TaeHoon Lee(이태훈),Jhin-Ha Park(박진하),Seung-Bok Choi(최승복),Cheol-Soo Shin(신철수),Ji-Young Choi(최지영) 한국소음진동공학회 2017 한국소음진동공학회 논문집 Vol.27 No.1
Recently, conventional hydraulic car lift systems face the technological limitations due to a lack of height control. The demand for height controllability is required in many tasks such as wheel alignment, and requires compensation for the structural deformation of the lift caused by irregular load distribution. In order to resolve this limitation of the conventional car lift, in this work, a new type of a hydraulic vehicle lift using a magneto-rheological (MR) valve system is proposed and analyzed. Firstly, the dynamic model of vehicle lift is formulated to evaluate control performance; subsequently, an MR valve is designed to obtain the desired pressure drop required in the car lift. Next, a proportional-integral-derivative (PID) controller is formulated to achieve accurate control of the lifting height and then computer simulations are undertaken to show accurate height control performances of the proposed new car lift system.
김완호(Wan Ho Kim),박진하(Jhin Ha Park),양순용(Soon Yong Yang),신철수(Cheol Soo Shin),최승복(Seung-Bok Choi) 한국소음진동공학회 2016 한국소음진동공학회 논문집 Vol.26 No.6
This paper presents performance comparison results of magneto-rheological (MR) brake in the sense of wear characteristics. To create wear circumstance, the brake is operated in 100 000 cycles by DC motor. To make wear test in same design parameters such as the radius of the housing, ferromagnetic disc and gap size, small sample of stainless are inserted in housing of MR brake. The performances of brake are compared between the initial stage (no wear) and 100 000 revolution cycles operated stage (wear). At each circumstance, torque of the brake is measured and compared by applying step current and sinusoidal control input. The controller used in this work is a simple, but effective PID controller. It is demonstrated that the wear behavior is more obvious as the operating cycle is increased in the torque control process.
피스톤 바이패스 유로가 있는 MR 댐퍼 장착 1/4 차량 현가시스템의 성능평가
김완호(Wan Ho Kim),황용훈(Yong Hoon Hwang),박진하(Jhin Ha Park),신철수(Cheol-Soo Shin),최승복(Seung-Bok Choi) 한국소음진동공학회 2017 한국소음진동공학회 논문집 Vol.27 No.1
This work presents a comparative work on the ride comfort of a quarter car suspension system between two different magneto-rheological (MR) dampers; one is conventional type without bypass hole and the other is featured by several bypass holes in the piston. As a first step, two different MR dampers are designed on the basis of the governing equation and manufactured with same geometric dimensions except the bypass holes. After investigating the field-dependent damping properties, two dampers are installed to the quarter car suspension system. The suspension model is then derived and a sky-hook controller is implemented to identify vibration control performance under random road. It is shown that the suspension system with MR damper featured by the bypass holes can provide much better ride quality than the case without the bypass holes. This is validated via experimental implementation.
한철희(Cheolheui Han),김태완(Tae-Wan Kim),마상진(Sang-Jin Ma),신철수(Cheol-Soo Shin) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.5
With the development of smart materials and the micro electro mechanical systems technology, the development of flapping micro air vehicles using extremely small scale and light weight actuators and batteries is actively undergoing. In this study, the effect of the changes in the wing's geometry(aspect ratio) and kinematical parameters such as wing beating frequency and amplitude on the aerodynamic characteristics is investigated using the commercial computational fluid dynamics analysis software. The computational fluid dynamics analysis showed that the heaving wing has the increased lift and thrust with its amplitude stepping up. The cause of the drag generation is because the wing is in heave oscillation with the smaller values of the Strouhal number that the normal range for the locomotion of the creatures in nature. It is believed that present results can be utilized to the configuration design and control of the future flapping micro air vehicle.
김평화(Pyunghwa Kim),한철희(Chulhee Han),칼루반 수레쉬(Kaluvan Suresh),박춘용(Choon-Yong Park),신철수(Cheol-Soo Shin),최승복(Seung-Bok Choi) 한국소음진동공학회 2016 한국소음진동공학회 논문집 Vol.26 No.5
This paper presents dynamic characteristics of a new actuator using magneto-rheological(MR) fluid between two electrode type coils. The concept of the actuator is to strengthen the force due to the magnetic field produced by the electrode-coil for MR fluid. The amount and direction of current input to the electrode-coils decide the characteristics of contraction-mode and extension-mode. For achieving the required actuating displacement and actuating force, the yield stress of the MR fluid between two electrode-coils is precisely changed by the input current. In this work, the MR fluid is operated in squeeze mode. The experimental results shown in this paper depict that it can be applied in the micro-level displacement and vibration control system.
신철수 忠州大學校 2009 한국교통대학교 논문집 Vol.44 No.-
For extended surfaces used in boiling liquids, the specified fin-base temperature may be such as to result in simultaneous nucleate, transition, and film boiling at adjacent positions on the fins. If the fins are spines of circular cross section, the optimum shape to minimize the volume of metal resembles a turnip, as shown by Haley and Westwater. The object of the new study was to develop easy-to-machine shapes using cones and cylinders. It was shown mathematically that two cons, base-to-base, give an excellent approximation to the turnip shape. Three such fins were constructed of copper and tested in Freon-113 at atmospheric pressure. The measured, peak heat duties were 5 to 70 percent higher than predicted values, proving that the design method is conservative.
LiBr-H2O 방식에 의한 흡수식 냉동기의 성능해석에 관한 연구
신철수 忠州大學校 2007 한국교통대학교 논문집 Vol.42 No.-
This paper is a study on the performance characteristics of a lithium bromide water absorption refrigeration system. The equation of the coefficient of performance is derived for a single stage cycle and the value calculated, When the evaporator temperature is at 40 ℉ and the efficiency of the liquid heat exchanger 0.75, under the assumption that the condensate in the condenser and the vapor in the evaporator are saturated. Through the calculated performance curves, the factors which influence the performance characteristics are discussed. It showed the coefficient of performance is affected by the condenser temperature and absorber temperature rather than the generator temperature, and only the water cooling systems are available when flat-plate , collectors are used as the energy source of the lithium bromide water cycle. change of Glucose.
레이저에 의한 表面 局所 加熱 時 黑體 塗料가 表面 溫度 變化에 주는 影響
金鍾喆,申澈洙,姜宇政,朴壽泉 충주대 산업과학기술연구소 1996 産業科學論文集 Vol.4 No.-
Measuring the thermophysical properties of solids in laser heating method, the material surface is coated by thin black paint layer(graphite) to minimize the effects of the laser beam reflection. But, the influence of the thin black paint layer on the surface temperature variations have been ignored. In this paper, a numerical analysis is carried out to clarify quantitatively the influence of the thin black paint layer when the material surface is heated locally. In the experiment, the material surface is heated by Ar laser beam and the surface temperature profiles are measured by an infrared thermometer.