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노승남,김희송,이승호 서울産業大學校 1998 논문집 Vol.47 No.1
Exhaust gas of vehicle is a big problem today. Reducing the weight of vehicle is desirable to reduce the cost and to improve the efficiency of vehicle. In the previous work, it seemed that the shot peening of suspension spring of vehicle improved the fatigue strength. Compressive residual stress can be obtained up to -792MPa by shot peening. Fatigue strength of machining spring steel is 425MPa. But fatigue strength of shot peened spring steel increased up to 756MPa.
권혁홍,최선준 韓國工作機械學會 2000 한국생산제조학회지 Vol.9 No.6
Springs for vehicle suspension control the vibration of a car and influence on the ridability, safety, and life of a car. In the paper, the computer aided design program has been developed, which design the leaf spring shape from the given spec-ifications using basic theory and the expert's knowledge, and the design results arc checked by the analysis theory in order to increase the accuracy, and feed back to the design input. For the purpose of easy use, this program consists of pull-down menu and interactive input mode. To prove the effec-tiveness of this program, two springs, of which one is symmetric, other asymmetric, arc designed and analyzed, and the outputs are compared to the experiments. Considering the tolerance of the given specifications, the results are good.
최선준,권혁홍 대진대학교 생산기술연구소 1998 생산기술연구소 논문집 Vol.1 No.-
Springs for vehicle suspension control the vibration of a car and influence on the ridability, safety, and life of a car. In the paper, the computer aided design program has been developed, which design the leaf spring shape from the given specifications suing basic theory and the expert's knowledge, and the design results are checked by the analysis theory in order to increase the accuracy, and feed back to the design input. For the prupose of easy use, this program consists of pull-down menu and interactive input mode. To prove the effectiveness of this program, two springs, of which one is symmetric, other asymmetric, are designed and analyzed, and the outputs are compared to the experiments. Considering the tolerance of the given specifications, the results are good.
열처리를 이용한 자동차 서스펜션 코일 스프링의 가속 피로 시험 방안에 대한 연구
신정규(J.K. Shin),신동열(D.Y. Shin),손태준(T.J. Sohn) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.4
내구 시험은 제품의 내구성을 평가하는 방법으로 제품 개발의 마지막 단계이다. 자동차 부품 개발도 마찬가지인데, 특히 내구시험의 특성상 시간이 오래 걸리게 되는데, 이는 파손까지 한계 내구시험을 수행함에 있어 시간과 에너지가 필요한 고비용 시험의 특징이다. 이러한 내구시험의 시간 부하를 줄이기 위해 다양한 가속 내구 시험 기법이 제안되고 있다. 본 연구에서는 가속 내구 시험 기법 중 온도를 활용하는 방법으로 풀림(Annealing)을 이용하여 스프링 제품에 부여된 압축 잔류응력을 일부 완화시켜 내구 시험 시간을 단축함으로써 제품의 결함 부위를 빠르게 찾는 것에 있다. 스프링 제품에 대하여 풀림 열처리를 통한 가속 내구 수명 시험의 결과를 소개한다. (본문의 그림 참조) Fatigue test must be performed to check whether a product under development will endure the expected product life cycle or not. The test is characterized by time-consuming method and therefore, accelerated techniques are proposed by many researchers to reduce time and energy for fatigue test. Generally, suspension coil spring is manufactured by shot-peening to expand the product life. Recently, stress-peening process is additionally applied to meet the life over one million cycle time. If the fatigue test with coil spring as manufactured is performed, it will take one-million cycle time. A fatigue test is performed by 1 Hz, the test will be finished by 12 days. In this study, an accelerated fatigue test is proposed by heat-treated coil spring to reduce compressive residual stress on the entire coil spring. Depending on the temperature and its duration time, it is known that the residual stress is reduced. Under a selected heat treatment condition, a coil spring life cycle is reduced. This technique can be applied to the industrial field to reduce the fatigue test cost.
장국진(Kook-Jin Jang),김철수(Chul-Su Kim),장천수(Cheon-Soo Chang),장승호(Seung-Ho Jang),김정규(Jung-Kyu Kim) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
To reduce the cost and the time of transport in Eurasian railroad networks such as TKR, TCR and TSR owing to the problem of different track gauges (narrow/standard/broad gauge), it is important to develop the gauge - adjustable wheel set system to adapt easily to these gauges. Moreover, This system accomplish a conversion operation periodically from the gauge variable segment between Various gauge. gauge variable pressure coil spring from conversion process accomplish a central role repetitively for operation mechanism between flange and locking part. Therefore, to assure the safety of the gauge-adjustment wheelset system, it is necessary to fatigue life evaluate of coil spring in the system using stress analysis. it was performed to evaluate stability of running track with UIC 510-4code. Fatigue life of the gauge - adjustable compression spring with the variation of the fatigue strength was evaluated by fatigue life analysis simulator
김철수(Chul-Su Kim),안승호(Seung-Ho Ahn),정광우(Kwang-Woo Chung),장승호(Seung-Ho Jang),장국진(Kook-Jin Jang),김정규(Jung-Kyu Kim) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
To reduce the cost and the time of transport in Eurasian railroad networks such as TKR(Trans-Korea Railway), TCR(Trans-China Railway) and TSR(Trans-Siberia Railway) owing to the problem of different track gauges (narrow/standard/broad gauge), it is important to develop the gauge - adjustable wheelset system to adapt easily to these gauges. Moreover, this system accomplishes periodically a conversion operation from the gauge variable segment between different gauge. Gauge adjustable compression coil spring during conversion process accomplishes repetitively a central role for operation mechanism between flange and locking part. Therefore, to assure the safety of the gauge-adjustment wheelset system, it is necessary to stress analysis of the optimized spring in the system. In this study, it was performed to optimal design of the spring for stress analysis by using the genetic algorithm and to stress analysis of the optimized spring by using FEA(finite element analysis)