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트랜섬 파이프 간격이 동력대차-견인전동기간 강체 모드 공진응답에 미치는 영향에 관한 연구
김재환,송시엽,임효석,Kim, Jaehwan,Song, Seeyeop,Lim, Hyosuk 한국음향학회 2019 韓國音響學會誌 Vol.38 No.3
본 논문은 동력차에서 견인전동기 기진 주파수와 견인전동기 강체 모드 공진 문제로 인해 발생할 수 있는 현상에 대해 소개하고, 이를 제어하는데 효과적인 설계인자를 해석적으로 검토해보았다. 회전 속도가 변하는 회전기기의 경우, 공진 문제를 해결하기 위해서는 공진주파수 대역을 상용 운전 범위 바깥으로 이동시키거나 동강성을 크게 하는 등의 방법을 통하여 공진 응답이 낮아지도록 하는 방안이 있다. 견인전동기의 운전 범위는 일반적으로 0 r/min ~ 4800 r/min으로 대차모드가 이 운전 영역대를 벗어나게 설계하는 것은 현실적으로 불가능 하다. 따라서 공진 응답에 영향을 주는 설계 인자를 찾아 이를 적절하게 조정하여야 한다. 유한요소 해석 검토 결과, 견인전동기 강체모드 공진 응답에 영향을 주는 설계인자는 트랜섬파이프 간격으로 간격이 지나치게 넓게 설계될 경우 견인전동기 기진력과 강체 모드 간 공진 시 과도한 진동이 발생될 수 있음을 파악하였다. In this paper, a problem of mechanical resonance between traction motor's rigid body mode and traction motor's excitation force is introduced, and a bogie design variable affecting the control of resonance response is reviewed numerically. To solve the resonance problem in rotating machinery with variable rotational speeds, resonance frequency should be out of rotational machine's operation range or dynamic stiffness of structures should be increased for resonance response enough to be low. In general, operation range of a traction motor is from 0 r/min to 4800 r/min. It is not possible that all bogie modes are more than 80 Hz. Therefore, it is very important to find design factor affecting resonance response of traction motor's rigid body modes. It is found that key design variable is the gab between transom pipes from finite element analysis. The larger gab is, the higher resonance response when resonance between traction motor's excitation force and traction motor's rigid body mode is happened.
한석영,송시엽 한국공작기계학회 2001 한국공작기계학회 춘계학술대회논문집 Vol.2001 No.-
The relationship between structural geometry and number of life cycles to failure is investigated to improve the fatigue life of structural components. The linear elastic fracture mechanics(LEFM) approach is integrated with shape optimal design methodology. The primary objective of this study is to decide an optimal shape for enhancing the life of the structure. The results from LEFM analyses are used in the fatigue model to predict the life of the structure before failure is occurred. The shape of the structure is optimized by using the growth strain method. Relevant issues such as problem formulation, finite element modeling are explained. Three design examples are solved, and the results show that, with proper shape changes, the life of structural systems subjected to fatigue loads can be enhanced significantly.
한석영,송시엽,Han, Seok-Yeong,Song, Si-Yeop 대한기계학회 2002 大韓機械學會論文集A Vol.26 No.8
Most of mechanical failures are caused by repeated loadings and therefore they are strongly related to fatigue. To avoid the failures caused by fatigue, determination of an optimal shape of a structure is one of the very important factors in the initial design stage. Shape optimization fer two types of specimens, which are very typical ones in opening mode in fracture mechanics, was accomplished by the linear elastic fracture mechanics and the growth-strain method in this study. Also shape optimization for a cantilever beam in mixed mode was carried out by the same techniques. The linear elastic fracture mechanics was used to estimate stress intensity factors and fatigue lives. And the growth-strain method was used to optimize the shape of the initial shape of the specimens. From the results of the shape optimization, it was found that shapes of two types of specimens and a cantilever beam optimized by the growth-strain method prolong their fatigue lives significantly. Therefore, it was verified that the growth-strain method is an appropriate technique for shape optimization of a structure having a crack.
구동장치에 의한 회전토크와 상대변위의 영향을 받는 연결샤프트 내구시험 평가
김우진(Woo-Jin Kim),송시엽(See-Yeob Song) 한국철도학회 2014 한국철도학회 학술발표대회논문집 Vol.2014 No.10
철도차량의 구동장치는 구동모터에 의해서 고속회전하며 이로인한 회전토크가 발생하게 된다. 모터감속기와 차축감속기가 각각 별도로 있는 구동장치는 모터로부터 받는 회전토크를 1차로 모터감속기에 전달을 하며, 모터감속기에서 나오는 회전력과 회전토크를 연결샤프트를 통하여 2차로 차축감속기에 전달하게 된다. 국내 고속철도의 경우 모터감속기는 차체에 취부되어 있고, 차축감속기는 대차프레임의 차축 연결이 되어 있어 주행 중 동적거동에 의해 상대변위가 발생하게 되며, 이 변위는 1차, 2차 스프링의 스프링강성(k)에 의해서 변위량이 결정된다. 따라서 연결샤프트는 차축감속기로부터 받는 회전토크와 상대변위에 의한 저항력을 받게 된다. 이에 본 논문에서는 이러한 조건을 반영하여 연결샤프트의 적절한 내구시험의 방법을 고찰하고자 한다. Driving gear unit for rolling stock is driven by a high-speed rotation from motor and generates the rotational torque simultaneously. The rotational torque from traction motor are transmitted to the motor reduction unit at first and then to the axle reduction unit through the shaft. In case of the domestic high-speed train the motor reduction unit is mounted to the carbody, and the axle reduction unit is connected to the axle of the bogie frame and this condition makes relative displacement by dynamic behavior during train running. The relative displacement is able to be taken from the spring stiffness(k) of the primary, the secondary spring. Therefore, the shaft is effected the resistance due to the rotational torque and relative displacement. We investigated the methods of the appropriate endurance test for the shaft to reflect this condition in this paper.
UIC code에 따른 대차 프레임 구조해석 및 시험에 관한 연구
최중호(Choi Joong-Ho),송시엽(Song See-Yeob),천홍정(Chun Hong-Yong),전형용(Jeon Hyung-Yong),박형순(Park Hyung-Soon) 한국철도학회 2002 한국철도학회 학술발표대회논문집 Vol.- No.-
This report is the result performed the structural analysis and the static and fatigue load test of bogie frame for the purpose of designing and verifying the bogie frame which satisfy the load condition required in the UIC code. This investigation is proposed the efficient draft of the design to satisfy the load condition required in the UIC code. And It is performed the structural analysis to evaluate the static strength and the fatigue life of the patient material and the welded part. Also, This is proposed the efficient draft of the test to satisfy the method of the static and fatigue test required in the UIC code. And it is carried out the sta-ic and the fatigue load test to verify it. We can designed the bogie frame in compliance with UIC 515-4 and 615-4 code.
유럽 규격을 적용한 디젤동차 대차프레임의 정적 및 피로강도 평가
김우진(Kim Woo-Jin),송시엽(Song See-Yoeb),박근수(Park Geun-Soo ),박형순(Park Hyung-Soon) 한국철도학회 2007 한국철도학회 학술발표대회논문집 Vol.- No.-
Rotem Company has designed and manufactured bogie for Diesel Multiple Unit (DMU) according to the European standard UIC615-4, which si normally used for desugning bogie frame. Because the countries located in Middle East do not have their own regulations for bogie design, most of running bogies in Middle East are designed by using European standard UIC615-4. UIC615-4 specifies the loads that bogie frame should withstand, indicates the way of material data to be used and the pronciples to be during verification by analysis and test. The bogie frame depends on the load conditions and magnitudes which are subjected to during service and characteristics of materials they are manufactured from. From the above reason, Rotem Company has performed Finite Element Analysis and load tests on the bogie frame according to UIC615-4. This research contains the results obtained by the analysis and the load tests. Also, this research verifies that the bogie frame has a static strength and fatigue strength. The analysis is carried out using I-DEAS 12 NX Series and specially designed test jigs and equipment are used for the load tests.