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- 저자 : 안대식 (검색결과 44 건)
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安大植,崔銀午 충주대학교 산업대학원 1999 大學院論文輯 Vol.1 No.-
The powertrain is a system of exciters which are connected by vibration transmitters and noise radiators. The powertrain has infinite natural frequencies. If the engine explosion excites a certain natural frequency, then the powertrain system seriously vibrates. The torsional vibration arises from here. Torsional vibration like this can cause various noises as rattle and booming. In this study,the simulation models of multiple degrees of freedom were developed to reduce the torsional vibration of the powertrain. These models are combined mass moment of inertias with torsional springs. The free and forced vibration analyses were carried out by these models;and the validity of the simulation models were checked by the field test. The reduction effect of the torsional vibration along the driveline design factor is presented by the analytical results.
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안대식 忠州大學校 1985 한국교통대학교 논문집 Vol.18 No.2
Pratically all modern aerospace vehicles are compnsed of stiffened or unstiffened shells, since these thin-walled structures exhibit very favorable strength over weight ratios. Results ate given for both axial and ring stiffened cylinders under axial compression and hydrostatic pressure. In some instances, in Particular in the case of axially stiffened cylinders under axial load, the sensitivity to imperfections, as well as the classical buckling load, appears to be strongly dependent on whether the stringers are attached to the outside or inside of the cylinder. Under certain conditions stiffening can significantly reduce or perhaps completely eliminate imperfection - sensitivity, whereas in other cases it may play a much smaller role in lowering the sensitivity.
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安大植 충주대학교 1994 한국교통대학교 논문집 Vol.29 No.1
In this paper, the expermentation was used to investigate a method of calculating the most effective position of notch and form. I have studied on the notch in order to increase effective energy absorption of hatted section member in the frontal impaction vehicle. The results were as follows: 1. Impact energy absorption is lager a wave-type notch than different from kind the notch. 2. In order to increase impact energy absorption we must induse compact mode of backling. 3. The notch distance is the most appropriation the length of half wave.
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안대식 忠州大學校 2007 한국교통대학교 논문집 Vol.42 No.-
The abjective of the research reported in this paper is to compare the effects of crush initiators, different in shape and size, on the first peak load and on the callapse mechanism of alluminium rectangular tube as well as keep a poly-urethan foam in the tubes. The most efficient solution has been submitied to experimental validation by quasi-static axial compression tests. The experimental results of crushing of the keep a poly-urethan foam in the Al tubes make these tubes a good candidate for a controllable energy absorption element.
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안대식 忠州大學校 1986 한국교통대학교 논문집 Vol.20 No.1
We are much interested in the study for wearing Properties because of in creasing of running speed in machineries and apparatus such so automobiles, airplanes. The experiment was carried out under the condition of sliding under constant lead with OAT-U type tester at the speed 0.74m/s. 1. The volume of wear amount between bronze slider and rotor is less than 1/20~1/25 those of mild steel. 2. The sliding friction of soft materials has been shown adhesive wear that of hard materials has been shown abrasive wear.
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Single Hat type Tube의 압괴에 대한 연구(Ⅲ)
安大植 忠州大學校 1995 한국교통대학교 논문집 Vol.30 No.1
This paper aims to investigare the crippling of thin-walled hatted members. Collapsing tests have been made on beams different in section size and thickness. When the side members collapse axially, they absorb large amount of crash energy enough to avoid the deformation of compartments. To promote the axial collapse without bending, beads are generally provided on the side member. But it is very difficult to find effective position of beading on the members.
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안대식 忠州大學校 2002 한국교통대학교 논문집 Vol.37 No.4
There are two type og buckling mode shapes on the pipe members.
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안대식,민병국 충주대학교 산업대학원 2001 大學院論文輯 Vol.2 No.-
For making economical and practical automotive, there are lots of research related to lightening the weight and more safety chassis. In the case of the single hatted-section tube specimen being used as the most vehicle structural member, at the moment of vehicle crush, the passenger will be in front of severe danger by the buckling of chassis. To avoid the buckling by first collision load and make the chassis have more power by absorbing the collision energy, the structure of chassis changed so that when crash occur, the chassis got a tensile force instead of compressive force. The result of experiments are 1. The load and displacement curve show that the first stage impact load in the direction of column can be reduced perfectly. 2. At compression, the absorbing energy quantity and the maximum buckling load are safety to each other. As a results of that relation, with the maximum buckling load can predict the absorbing energy quantity. The critical value of the thickness-width ratio is useful for predicting the compact mode but no good for predicting the absorbing energy quantity. 3. When the thickness of material is constant, the little cross sectional area which means that the critical value of the thickness-width ratio is bigger and which show good ability of the absorbing energy quantity. In all different size of materials, the tensile absorbing energy quantity is about 80-90% of the compression absorbing energy quantity. 4. The best recommended thickness of material is 1.0 ㎜ thickness and 50×50㎜, considering the material weight and the absorbing energy quantity.
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安大植 충주대학교 1992 한국교통대학교 논문집 Vol.26 No.-
This paper investigates the crush characteristics of members of the automobile body structure. In automobile collisions, most of the collision energy must be absorbed by body deformation. The purpose of this paper is to drive a relationship that will provide a rational basis for the design of more efficient energy-absorbing structures. The results are as follows : 1. Theory formular of the Okubo came to 95% equal in the experimental value. 2. Maximum load has nothing to do with impact energy absorption. 3. Impact energy absorption is lager a regular square tube than a regular quadrangle tube in the same size.
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