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- 저자 : 허신 (검색결과 378 건)
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허신,구정서,최진민,Heo, Sin,Gu, Jeong-Seo,Choe, Jin-Min 한국기계연구원 1995 硏究論文集 Vol.25 No.-
Steering column is a typical component that may injure the driver at a frontal collision accident. To protect the driver from an impact, it is very important to study the impact absorbing behaviour of steering column. The dynamic simulation were performed for the ball sleeve type impact absorbing steering column. The simulation results show similar trends to FMVSS 203 test results. Hence using the simulation program developed in this study, it is possible to predict dynamic response of steering system which is used in design modification. Impact absorbing performance of the ball sleeve type steering column with the column angle of $21^\circC$ and $26^\circC$ satisfies the safety criterion of FMVSS 203.
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허신,구정서,우창수,김유일,Heo, Sin,Gu, Jeong-Seo,U, Chang-Su,Kim, Yu-Il 한국기계연구원 1996 硏究論文集 Vol.26 No.-
In this study, we performed the static analysis of a cord-reinforced rubber airspring and generated the three-dimensional half-symmetry model which use the finite-strain shell elements to model the airbag. the three-dimensional hydrostatic fluid elements to model the air-filled cavity, and the rebar elements to model the multi-ply nylon reinforcement of airbag. In addition, a three-dimensional rigid surface is used to define the contact between the airspring and metal bead. The air inside the airspring cavity has been modeled as a compressible fluid satisfying the ideal gas law. The conclusions of this study are as follows. 1) In the pressurization step of analysis, we could predict the change of vertical reaction force, cavity volume and pressure within the airspring. 2) In the second step of analyzing vertical static stiffness, the increase of the vertical load increases the vertical stiffness. 3) In case of changing the angle of nylon cord, the increase the angle of nylon cord increases the vertical stiffness.
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전자기 액튜에이터를 이용한 1/4차량 모델의 능동 진동 제어에 관한 연구
허신,최강윤,김유일,Heo, Sin,Choe, Gang-Yun,Kim, Yu-Il 한국기계연구원 1993 硏究論文集 Vol.23 No.-
In this study, quarter vehicle model is used to analyse vibration control effects for ride comfort and handling safety according to this three kinds of control methods, which are the modal control, the sky-hook control and the linear viscous damping control. We performed theoretical analysis and experiments and compared two results. In experiments, electro-magnetic actuator was employed as a force actuator. It is shown that all three methods can effectively control the vehicle model. The modal control method gives similar control results using gain less than the viscous damping control.
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허신,하성도,Heo, Sin,Ha, Seong-Do 한국기계연구원 1997 硏究論文集 Vol.27 No.-
The dynamic design process for the articulated bogie of light rail vehicle(LRV) was studied to design a primary and secondary suspension elements. Suspension stiffness and damping is selected on the basis of the ride quality and suspension stroke trade-off. LRV was modeled as a 2 d.o.f linear system for the design of vertical suspension characteristics and a 4 d.o.f linear system for the design of lateral suspension characteristics. FRA's class-4-track irregularity was used for the exciting disturbance on track. The optimum value of primary and secondary suspension characteristics was determined using this design process.
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허신,경진호,송달호,김정수,조용현,Hur, S.,Kyung, J.H.,Song, D.H.,Kim, J.S.,Cho, Y.H. 한국철도학회 2002 한국철도학회논문집 Vol.5 No.1
In this study, we have developed the static and dynamic simulation program of a high speed current collection system. The catenary wire is modeled to discrete masses connected by massless strings and the pantograph is replaced with 3 d.o.f equivalent models that are composed of masses, springs and dampers. We derived partial differential equations of motion from the equivalent model and developed the simulation program. Then, we calculated the static equilibrium state of the overhead catenary and the dynamic behaviors of the high speed current collection system. The analysis results were compared with the results of GASENDO software developed at RTRI in Japan.
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운전자 충돌에 의한 에너지 흡수식 스티어링 시스템의 동적 해석
허신,구정서,최진민,Heo, Sin,Gu, Jeong-Seo,Choe, Jin-Min 한국기계연구원 1994 硏究論文集 Vol.24 No.-
Steering system is typically one of the vehicle parts that may injure an unrestrained driver in a frontal collision. Therefore, the engineers of vehicle safety parts researched the allowable injury criteria such as HIC(head injury criterion). chest acceleration and knee impact force. From their research, they recognized that development of energy absorbing steering system was necessary to protect the driver. Energy absorbing parts of steering system consist of shear capsule, ball sleeve and shaft assembly. We performed the modelling and dynamic analysis of the energy absorbing steering column with the unrestrained driver model. The conclusions of this study are as follows. 1) The variation of column angle has an important effects on the dynamic responses of steering system and driver behavior. 2) The energy absorbing steering system satisfies the safety criterion of FMVSS 203, 208, but not the safety criterion of FMVSS 204.
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허신,이영화,박준식,김완두,최홍수 한국통신학회 2010 정보와 통신 Vol.27 No.9
본 논문은 인간의 청각기능을 보조하거나 대체할 수 있는 차세대 청각보조장치 및 완전 이식형 인공와우에 관련한 기술동향에 대해서 기술한다. 청각보조장치는 MEMS 마이크로폰과 음장가시화 기술을 기반으로 하여 청각정보를 시각적으로 전달하고자 하는 장치이다. 이를 위해서는 초소형 MEMS 마이크로폰의 최적화 및 실시간 음장가시화 기술 개발이 선행되어야 한다. 차세대 생체모사 인공와우 기술은 기존 인공와우의 단점인 잦은 충전, 장애 노출 등을 극복하고 향상된 음감을 전달할 수 있는 완전 이식형 인공와우로서 그 기술동향을 논하고자 한다.
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가상 냉동사이클을 활용한 공기 열원 히트펌프 시스템의 성능 예측
허신,김효준,이진현,조영흠 한국태양에너지학회 2024 한국태양에너지학회 논문집 Vol.44 No.5
This study aimed to develop and test a performance prediction method using virtual refrigeration cycle generation through the air and indoor-side data of a building automation system and heat pumps in an air source heat pump system of a central air-conditioning system, to which the building automation system is applied. The results of coefficient of performance, Δhcomp,ref, Δhcond,ref, and Δhevap,ref of the measured refrigeration cycle according to outside temperature were confirmed. A similar pattern was confirmed by the prediction results through the virtual refrigeration cycle. Reliability evaluation of the performance prediction results of the air source heat pump system was conducted using NMBE and CvRMSE as proposed in ASHRAE guideline 14. NMBE and CvRMSE were confirmed as -6.33% and 15.99% for the coefficient of performance, 0.91% and 11.78% for Δhcond,ref, -5.53% and 12.48% for Δhevap,ref, and 0.14% and 2.85% for Δhcomp,ref, respectively. Thus, the performance of the air heat source heat pump system using a virtual refrigeration cycle can be predicted. Future research will use the performance prediction model of the air heat source heat pump system developed in this study improve the detection and diagnosis of physical and operational failures in heat pump systems.
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