• 수산해양기술연구
• /
• 제31권3호
• /
• pp.228-239
• /
• 1995

우리나라 800 ps급 쌍끌이 저인망어선에서 사용할 수 있도록 덴마크에서 이미 보편적으로 사용하고 있는 사용하고 있는 쌍끌이 중층 트롤 어구를 Tauti의 어구비교법칙과 예인수조의 크기 등을 고려하여 1/30의 크기로 축소 제작하여, 이 모형어구에 대한 기본 성능을 알아보기 위해 예인속도 0.46~1.15m/sec(실물환산 2~5k't), weight 142g(실물환산 640kg)에 Front weight 15.5~62.0g(실물환산 70~280kg) 및 양선간격 5~8m(실물환산 150~240m)의 변화에 따른 모형어구의 망고, 망폭, 예인장력, 예망수축 등을 측정 분석하여 실물로 환산한 결과를 요약하면 다음과 같다. 1. 망고는 예인속도 2k't, Front weight 280kg, 양선간격 150m 일 때 32m로 가장 높게 나타났으며, 예인속도 5k't, Front weight 70kg, 양선간격 240m 일 때 6m로 낮게 나타났다. 2. 망폭은 예인속도 5k't, Front weight 70kg, 양선간격 240m 일 때 45m로 가장 넓게 나타났으며, 예인속도 2k't, Front weight 280kg, 양선간격 150m 일 때 33m로 가장 좁게 나타났다. 3. 예인장력은 예인속도 5k't, Front weight 280kg, 양선간격 240m일 때 10,000kg로 가장 크게 나타났으며, 예인속도 2k't, Front weight 70kg, 양선간격 150m 일 때 1,600kg로 가장 작게 나타났다. 4. 어구의 예망수층은 예인속도 2k't, Front weight 280kg, 양선간격 150m 일 때 38m로 가장 깊게 나타났으며, 예인속도 5k't, Front weight 70kg, 양선간격 240m 일 때 6m로 가장 얕게 나타났다. 5. 어구의 망구면적은 예인속도 2k't, Front weight 280kg, 양선간격 180m 일 때 1,100m 상(2)로 가장 크게 나타났으며, 예인속도 5k't, Front weight 70kg, 양선간격 240m 일 때 250m 상(2)로 가장 작게 나타났다

• 한국정밀공학회:학술대회논문집
• /
• 한국정밀공학회 2004년도 추계학술대회 논문집
• /
• pp.1487-1490
• /
• 2004

In this study, the crash analysis was carried out to evaluate the influence of steel sheet grade and thickness on weight reduction and crash characteristics for front side member which had an important role of absorbing the impact energy during front and side impact. In order to achieve the aim of this study the reverse engineering was applied to obtain 3D model of front side member from BIW for the FE simulation. In the result, the crashworthiness of front side member is considerably improved with steel sheet strength and thickness increase. Also, the weight reduction in automotive parts for the improvement of the fuel efficiency can be easily achieved with applying high strength steel without deterioration of crashworthiness.

• 한국정밀공학회지
• /
• 제23권9호
• /
• pp.149-155
• /
• 2006

This paper is concerned with the weight reduction of front side member of a vehicle considering the application of high strength steel sheet. The influence of steel sheet grade and thickness on the energy absorption, impact load and deformed shape of front side member is investigated by using reverse engineering and FE-analysis. The reverse engineering is applied to obtain 3D model of front side member from B.I.W for the FE simulation. FE analysis is carried out with commercial crash analysis SW PAM-CRASH. The crashworthiness of front side member is considerably improved with steel sheet strength and thickness increase. From the result of this study the weight reduction in automotive parts for the improvement of the fuel efficiency can be easily achieved with replacing high strength steel without deterioration of crashworthiness.

• 한국공작기계학회논문집
• /
• 제10권1호
• /
• pp.51-58
• /
• 2001

The use of tailor welded blanks (TWB) in automotive applications is increasing due to the potential of weight and cost saving. The object of this study is development of the front side member by static analysis and crash simulations. Accord-ing to the results , energy absorption and barrier force is very important parameter to control passenger safety and deforma-tion shape. A energy absorbability point of view, tailor welded blanks is most effective to absorb energy than non-twb. Non-TWB front side member and TWB applied front side member were simulated. It shows reduce stmping parts weight reduction and cost down.

• 한국공작기계학회:학술대회논문집
• /
• 한국공작기계학회 2000년도 춘계학술대회논문집 - 한국공작기계학회
• /
• pp.403-408
• /
• 2000

The use of tailor welded blanks(TWB) in automotive applications is increasing due to the potential of weight and cost saving In this study, the front side member of passenger car is developed by typical analysis and crash simulations. According this results, energy absorption and barrier force is very important to control passenger safety and deformation shape. For that purpose, it is most effective to absorb energy more tailor welded blanks front side member than non-twb. The front side member with twb is simulated, in which reduced stamping parts, weight reduction and cost down.

• 한국소성가공학회:학술대회논문집
• /
• 한국소성가공학회 2008년도 추계학술대회 논문집
• /
• pp.169-173
• /
• 2008

This study is concerned with adopting the hydroforming method in the front axle of the commercial vehicle. Generally the front axle of the commercial vehicle is made bγ the several operations of press forging. This product supports the big weight of the vehicle and load. The weight of the press forging parts is also so more than it of the press parts of the passenger car. So, we have studied the hydroforming method to lessen the weight of the front axle of the commercial vehicle. To apply the hydroforming method in the commercial vehicle, we had to use the operation of reducing the diameter of the used tube prior to the hydorforming operation.

• 한국소성가공학회:학술대회논문집
• /
• 한국소성가공학회 2005년도 추계학술대회 논문집
• /
• pp.34-37
• /
• 2005

While all-aluminum front end carriers have been frequently used by major foreign auto-makers, the carriers domestically produced are typically hybrid types. It is understood that higher fuel efficiency due to weight reduction can be achieved by using aluminum carriers because of aluminum's light weight. Moreover, aluminum is expected to posess high corrosion resistance and recyling rate. As a first step to enhance feasibility of domestic production of all-aluminum carriers, several carriers made by advanced auto makers are examined and compared. Besides basic characteristics such as appearance and weight, physical properties including composition, strength and elongation are carefully analyzed to obtain critical design and process factors.

• 한국항공운항학회지
• /
• 제22권2호
• /
• pp.27-33
• /
• 2014

There are several methods to improve the flight efficiency of HALE(High Altitude Long Endurance) UAV(Unmaned Aerial Vehicle). Airframe structural point of view, weight reduction of the airframe structure is the most important method to improve the flight efficiency. In order to reduce the weight of airframe structures, new concepts which are different from traditional airframe structure design such as the mylar wing skin should be introduced. The spar is the most important component in a mylar skin wing structure, so the spar weight reduction is the key point for reduction of the wing structural weight. In this study, design trade-off study for the front spar of the HALE UAV wing is conducted in order to reduce the weight. Design and analysis procedure of high aspect ratio wing spar are introduced. Several front spar structures are designed and trade-off study regarding the weight and strength for the each spar are performed. Spar design configurations are verified by the static strength test. Finally, optimal front spar design is decided and applied to the HALE UAV wing design.

• 한국어업기술학회:학술대회논문집
• /
• 한국어업기술학회 2001년도 춘계 수산관련학회 공동학술대회발표요지집
• /
• pp.67-68
• /
• 2001

무부자 쌍끌이 중층망은 유속에 관계없이 뜸줄이 거의 일직선으로 유지되고 뜸줄의 깊이 변화가 없으므로 부력은 작용하지 않지만 아래 끌줄의 길이를 조절함으로써 망고를 유지할 수 있다. 또한, 무부자 쌍끌이 중층망은 발줄의 침자 외에도 추(Front weight)와 날개끝 추(Wing-end weght)의 무게를 증가시키면, 아래쪽으로의 침강력이 작용하여 망고를 더 크게 할 수 있어 기존어구보다 전개성능을 더욱 향상시킬 수 있다. (중략)

• 제어로봇시스템학회논문지
• /
• 제21권10호
• /
• pp.903-909
• /
• 2015

This article presents an integrated chassis control with electronic stability control (ESC) and active front steering (AFS) under saturation of front lateral tire force. Regardless of the use of AFS, the front lateral tire forces can be easily saturated. Under the saturated front lateral tire force, AFS cannot be effective to generate a control yaw moment needed for the integrated chassis control. In this paper, new integrated chassis control is proposed in order to limit the use of AFS in case the front lateral tire force is saturated. Weighed pseudo-inverse control allocation (WPCA) with variable weight is adopted to adaptively use the AFS. To check the effectiveness of the proposed scheme, simulation is performed on a vehicle simulation package, CarSim. From simulation, the proposed integrated chassis control is effective for vehicle stability control under saturated front lateral tire force.