• 한국정밀공학회지
• /
• 제29권12호
• /
• pp.1304-1312
• /
• 2012

According to the successful development of hybrid vehicle, hybridization of construction equipments like excavator, wheel loader, and backhoe etc., is gaining increasing attention. However, hybridization of excavator and commercial vehicle is very different. Therefore a specialized energy management control algorithm for excavator should be developed. In this paper, hybridization of excavators is investigated and a new energy management control algorithm is proposed. Four control parameters, i.e., lower baseline, upper baseline, idling generation speed, and idling generation torque, are newly introduced and a new operating principle using those four control parameters is proposed. The use of Genetic Algorithm for the optimization of the four control parameters from the view point of minimization of fuel consumption for standard excavating operation is suggested. In order to verify the proposed algorithm, dedicated simulation program of hybrid excavator was developed. The proposed algorithm is applied to a specific hydraulic excavator and 20.7% improvement of fuel consumption is achieved.

• 소음진동
• /
• 제9권1호
• /
• pp.184-188
• /
• 1999

Noise regulation of heavy construction machinery is getting stricter： 3 dB per every 4 year in European community. To meet this requirement many engineers have adopted the enclosing structures with thick absorbing materials and small opening, This increases internal temperature of the enclosure which have engine systems such as electric equipment that are vulnerable to heat, and engine block and muffler that can be regarded as heat sources. So noise control engineers have to consider a coupling problem: combining heat balance and noise reduction. This paper describes this approach by introducing simple heat transfer theory and SEA. The enclosing system of the loader whose enclosing structure consists of two rooms is investigated to show the validity of this method. The results represent that the simple heat transfer theory can be useful to estimate cooling performance when it is linked together by the back pressure theory in duct system. and the radiated noise can also be estimated by the SEA. Therefore a designer can use these approaches to define the opening ratio of an enclosure and the mass flow rate of air considering radiating noise.

• 수산해양기술연구
• /
• 제53권2호
• /
• pp.196-203
• /
• 2017

The renewable energy sources can be thought of one of the major measures to reduce greenhouse gas emissions in the industries. However, the utilization technology for those sources is approaching in the different matters. One of them, thermoelectric generation might be applicable to fishing industry. A various of internal combustion engines are used in a wide range of fisheries. After the ignition process, the heat passed out from the exhaust outlet. Recycling the heat could be not only an energy source but also reduction of green gas emission. Therefore, this study was designed to verify the feasibility of generation from wasted exhaust gas and analyze the performance. The designed experiment devices were connected with a data logger and an electric loader to quantify the currency and voltage. The devices were installed in a coastal fishing vessel for a gillnet fishery. During the whole fishing trips, the amount of generation was measured by engine rpm and the fishing operation procedures including vessel operations. At the maximum 1,500 rpm in the practical range, the generation amount was 113.6 W. The amount difference in relation to connection method was within 5 W: serial connection was 111.4 W and parallel connection was 115.8 W.

• 한국산학기술학회논문지
• /
• 제20권5호
• /
• pp.73-80
• /
• 2019

본 논문은 기존 5ton 카고 트럭의 적재함을 개조하여 농기계의 상, 하차를 손쉽게 할 수 있도록 하는 전동 유압 슬라이딩 데크를 개발하기 위하여 전동 유압 슬라이딩 데크 시스템의 기본 설계를 수행하였고, 기구학적 해석을 통하여 슬라이딩 데크의 길이와 구조를 고안 하였으며, 구조해석을 통하여 안전성과 경제성을 고려한 재질을 선정하였다. 먼저 슬라이딩 데크 시스템의 기본 설계를 위하여 운송 대상 농기계를 조사하였고, 필요한 요소들을 선정하였다. 선정한 요소들을 충족시킬 수 있는 유압실린더를 이용한 시스템을 고안하였다. 단순화 모델링과 기구학적 다이어그램을 통하여 슬라이딩 데크 시스템의 작동 구조를 파악하였으며, 기구학 해석을 통해 슬라이딩 데크의 최소길이와 그 구조를 고안하였다. 안전성과 경제성을 모두 만족하는 재질을 선정하기 위하여, 자동차 구조물에 사용되는 대표적인 4가지 재질을 선정하였다. 해석이 필요한 부분을 선정하고, 단순화 모델링을 통해 최대하중을 받는 조건에서 재질에 따른 응력과 변형량을 비교하였다. 그 결과 SS41P 재질사용하면 단가를 줄이고 안전성을 만족하는 결과를 얻을 수 있었다. 작동이 불가능한 농기계의 상, 하차를 위하여 윈치 시스템을 설계하고 적용하였다.