著者

福井 貴大 松川 宗一郎 福岡 泰宏

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 (ISSN:21879761)

巻号頁・発行日

vol.85, no.870, pp.18-00360, 2019 (Released:2019-02-25)

参考文献数

57

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This study aims to suggest a method for achieving an autonomous gait transition according to speed for a four-legged robot pacing at medium speeds. Our quadruped robot is simply designed and applies a central pattern generator (CPG) for each leg. Each leg is controlled by a PD controller based on a rhythmic output from the CPG. The four CPGs are coupled, and a hard-wired CPG network is constructed to generate a default pace pattern. In addition, we apply feedback of the body tilt to the CPG as vestibular sensory feedback. As a result, our robot safely locomotes at various speeds by autonomously changing the gait from walking to pacing to rotary galloping according to speed, despite the fact that the walk and rotary gallop are not predefined. A factor that causes the gaits' emergence is considered the body oscillation that changes according to the speed. The body oscillation exhibits a double peak per leg frequency at low speeds, no peak at medium speeds, and a single peak at high speeds. The phase differences between the four legs are adjusted according to the body oscillation by feeding the body tilt back to the CPG. The gait transition is triggered only by the body tilt angle, we expect that the suggested method can be generally used for quadruped robots.

著者

城間 直司 石川 哲史 井上 康介 福岡 泰宏 森 善一

出版者

一般社団法人日本機械学会

雑誌

日本機械学會論文集. C編 (ISSN:03875024)

巻号頁・発行日

vol.76, no.763, pp.619-626, 2010-03-25

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Autonomous control of an articulated steering type vehicle such as a wheel loader, which is usually used at surface mining fields to load mineral resources and rocks, is highly expected for operation cost reduction. A wheel loader is one of heavy machines which is also used for snow removing and/or loading operation at construction fields because of its high mobility. Its steering system is articulated steering and the rear wheels follow tracks where the front wheels have traveled. We have introduced a new virtual velocity constraint of the vehicle and formulated nonlinear state equations using two velocity constraints. A nonlinear state-feedback controller is designed using exact linearization. Simulation and experimental results show that an articulated steering type vehicle can follow a straight line with the proposed feedback control method.