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A Review of Rear Axle Steering System Technology for Commercial Vehicles
Haroon Ahmad Khan(하룬 아흐마드 칸),So-Nam Yun(윤소남),Eun-A Jeong(정은아),Jeong-Woo Park(박정우),Chung-Mok Yoo(유충목),Sung-Min Han(한성민) 유공압건설기계학회 2020 드라이브·컨트롤 Vol.17 No.4
This study reviews the rear or tag axle steering system’s concepts and technology applied to commercial vehicles. Most commercial vehicles are large in size with more than two axles. Maneuvering them around tight corners, narrow roads, and spaces is a difficult job if only the front axle is steerable. Furthermore, wear and tear in tires will increase as turn angle and number of axles are increased. This problem can be solved using rear axle steering technology that is being used in commercial vehicles nowadays. Rear axle steering system technology uses a cylinder mounted on one of rear axles called a steering cylinder. Cylinder control is the primary objective of the real axle steering system. There are two types of such steering mechanisms. One uses master and slave cylinder concept while the other concept is relatively new. It goes by the name of smart axle, self-steered axle, or smart steering axle driven independently from the front wheel steering. All these different types of steering mechanisms are discussed in this study with detailed description, advantages, disadvantages, and safety considerations.
프리필 밸브의 거동 예측용 유압 시스템의 압력/유량 맥동 분석
박정우(Jeong Woo Park),하룬 아흐마드 칸(Haroon Ahmad Khan),정은아(Eun-A Jeong),권성자(Sung-Ja Kwon),윤소남(So-Nam Yun),이후승(Hue-Sung Lee) 유공압건설기계학회 2021 드라이브·컨트롤 Vol.18 No.2
In this work, a circuit with a hydraulic power unit is formulated as a means of predicting the behavior of the prefill valve in the future. The behavior of the prefill valve can be examined by the measurements of the configured power unit, and the performance is determined by using hydraulic pumps, relief valves, and hydraulic hoses that make up the power unit. In particular, pressure/flow pulsation generated by hydraulic pumps can cause instability in the prefill valve and cause noise-induced degradation of the overall performance and reliability of the hydraulic system containing the prefill valve. Therefore, to study the behavior and performance of the prefill valve in a relatively accurate manner, the prediction of the characteristics of the hydraulic power unit driving the prefill valve is very important. In this study, the pulsation characteristics of the hydraulic pump were analyzed to theoretically demonstrate its relationship with different settings of the power unit, such as relief valve pressure settings and the presence/absence of the hose.