A system approach for studying the engine dynamic characteristics requires a cranktrain flexible body dynamic model including crankshaft, connecting rod and piston. By using a multi-body dynamics code, LMS Virtual Lab, rigid body dynamic model and flexible multi-body dynamic model were established. From these models, the dynamic loads acting on the crankshaft were calculated. Rigid model for V12 engine cranktrain with components connected by kinematical constraints was transformed into a flexible model by replacing rigid crankshaft and connecting rods with flexible ones. And to secure the credibility of flexible body model, three kinds of flexible models were tried, i.e. a model with a fully flexible crankshaft, model with a partially flexible crankshaft(1/6 of the whole length), and a partial detailed flexible model(with finer meshes). The results from each model were compared, and a partial detailed model with finer meshes was found to give reasonable stress values within relatively short period of computing time.

A Vacuum pump for industrial machinery(fuel dispenser for gas station) is developed using reverse engineering process. The 3-D Modelling for a sample imported pump is constructed by 3-D scanner and CATIA. The kinematic analysis are accomplished using LMS Virtual Lab. The analysis shows quite reasonable result. The prototype vacuum pumps are fabricated by the die casting method with 3-D modelling. The pumps show applicable performances compared to the current pump with a point of view of pressure, durability.

This paper presents a study on the adhesive strength testing of self-adhesive waterproofing/anti-corrosion sheet used for waterproofing of the large diameter steel pipe interior of water treatment facilities. After the sheet has been applied, similar physical and chemical immersion conditions are simulated in the testing to determine the effects of deterioration through adhesion strength testing.

Concrete residential structures are being redesigned for maximum space utilization efficiency by including parking lots and other convenience facilities. However, there are increasing problems of leakage due to various environmental and deterioration conditions. This paper proposes the a world-wide-web based professional information sharing system designed to provide solutions, alternatives and technical information for leakage prevention and effective design at the beginning of the construction stage.

There are many cases where large areas of the underground parking lots of residential buildings do not have proper measures against prevention of leakage, resulting in condensation, growth of infectious microogranisms and increase of pollution in the air. This paper discusses a study conducted to understand the awareness of leakage problems and the damage that follows in the underground structures of residential buildings.

There are many cases where large areas of the underground parking lots of residential buildings do not have proper measures against prevention of leakage, resulting in condensation, growth of infectious microogranisms and increase of pollution in the air. This paper discusses a study conducted to understand the awareness of leakage problems and the damage that follows in the underground structures of residential buildings.

This paper analyzes the different expansion properties of various acrylic waterproofing repair materials and draws a conclusion on stable leakage repair measures based on the test results.

This study is based on a survey conducted to understand the current problems of water leakages in underground structures. According to the overall results, 55.7% of the respondents replied that water leakage problems is serious and all replied that a preventative measure is absolutely necessary.

Waterproofing materials applied in underground structures are commonly exposed to environmental factors such as rain water, vibration, structural movement. Particularly in the case of rain waters, the pollutants and chemical substances penetrate into the waterproofing layer surface and cause complex degradation. Approaching this problem with only conventional leakage preventative measures may prove difficulties in solving it. In this regard, 3 dimensional material evaluation methods (waterproofing system structure) should be employed over 2 dimensional methods, and a testing method that allows the simultaneous testing of various degradation conditions found in underground environments is necessary.

현재 대형 빌딩이나 공동주택에 건설되는 지하구조물은 건조수축, 시공이음, 폼타이부 등에서 콘크리트 균열로 인한 누수가 많이 발생되고 있다. 누수가 발생하게 되면 구조물의 지하공간은 결로, 곰팡이 등이 발생되어 지하 환경을 악화시키고 구조물의 콘크리트로 흡수되 면 철근의 부식 등을 유발하여 구조물의 안전을 위협한다. 이는 지하구조물의 사용과정에서 장기적인 쾌적성과 구조물에 안전성이 고려되지 않은 설계와 시공의 결과이며 누수 하자에 대하여 유도배수처리로 대응하기 때문에 근본적인 누수보수가 이루어지지 않아 지하구조물은 항시 누수를 허용하고 있는 실정이다. 따라서 본 연구에서는 지하에 적용되는 방수공법을 내방수와 외방수로 분류하고 이를 바탕으로 지하구조물 과 유사한 간이시험체를 제작하였으며, 결로가 많이 발생되는 동절기의 온도조건을 기준으로 지하환경의 방수공법별 습도변화량을 분석할 것 이다.

we set reference temperatures for the 4 seasons of Korea and measured the humidity difference of underground structures according to the seasonal change by conducting a test with specimens that applied the same waterproofing materials and methods with basement structures. The test results show that the humidity difference of the specimens that applied unwaterproofed method and inside waterproofing method became higher according to the time variation regardless of temperature, while that of the specimens that applied outside waterproofing method was none or not significant.

Underground material and to secure any other appropriate waterproofing method for improving the workability experiments on non-woven fabric weight is selected. As a result, the appropriate non-woven fabric weight of 140 g/㎡ was confirmed.

Several researches of durability are proceeded domestically and internationally based on this circumstances and apply various integrity evaluation techniques and reinforcement methods of reinforced concrete structures to maintain the durability. Application of building coating materials on building external is effective as a popular material method to maintain durability of reinforced concrete structures as design.