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自動車 懸架系의 Parameter 變化에 대한 性能評價
李圭泰,崔秉起 조선대학교 동력자원연구소 1992 動力資源硏究所誌 Vol.14 No.1
A linear quarter model of a vehicle suspension system is builted simulated.Especially the so called sensitivity analysis is done in order to snow its applicability to design problems,and sensitivity function is determined in the frequency domain, The change of frequency response function is predicted, which depends on the design parameter variation and the property is verified by computer simulation. Typical performance measures, namely, sprung mass acceleration, suspension deflection, and tire defiection are examined, The vehicle model is analyzed for its performance sensitivity as a function of the system's feedback gains. The varied feedback gains are selected as the spring and damping coefficient. Frequency response,RMS response, and prformance index of the performance evaluation variables are considered and response surfaces of three-dimensional and contour plot are formed to examine output sensitivity to suspension feedback. Performance trade-offs over the entire frequency spectrum are identified from the FRF, and that between ride quality and handling charateristics are exa mined from the RMS responses.
高强度 알루미늄 合金材(Al 2024-T3)의 Shear Lip에 關한 硏究
崔秉起,李圭泰 조선대학교 동력자원연구소 1991 動力資源硏究所誌 Vol.13 No.2
This paper aims to examine the effect of shear lip formation from cross-sections on fatigue crack propagation rate in order to study the fatigue fracture behavior of the high strength aluminum alloy material(Al 2024-T3). The following tests were achieved from this research. 1. As a result of depressing shear lip artificially by adding a side groove to a specimen, it is shown that the propagation rate of fatigue crack is faster than that of the general specimen. 2. Through the two-step load test, the phenomenon that the shear lip decreases in the part of changed load gets observed. Consequently it is shown that the crack propa-gation rate gets faster.
최병기,권택용,이상열 한국산업안전학회 1997 한국안전학회지 Vol.12 No.2
The fatigue crack propagation rate has so far been measured by the effective stress intensity factor range ΔK_(eff). But no research has been done to study how much the crack opening ratio influences the expectation of the fatigue crack propagation. Therefore, this paper evaluates of the crack opening ratio on the fatigue crack propagation life by using the method of parameter sensitivity study. Summarizing the result; (1) When the crack opening ratio U' is high, the effect of U' gets larger than any other except for the material factor m. But when U' is low, the effect is also diminished. Therefore, the selection of the lowest value possible is desirable in the evaluation of life. (2) When the value of the material factor m is high, the effect of crack opening ratio U' is increased; at the same time the effect of the other parameters also increased wholly. The effect of material factor m itself on life is high, but in case the material factor m is high, that the effect of each parameter on life get higher is unique. In designing, better attention to the material selection should be drawn. (3) In case the stress ratio R gets smaller, the effect of crack opening ratio U' is unchangeable. But the effect of R itself remarkably decreases, and the effect of material factor m somewhat decreases.