Development of a Power-Assist Lifting Device Using Multi-DOF Suspension Mechanism (2nd Report, Study on Sequential Identification Technique of Jacobian Matrix)

Recently, in plant construction sites, a shortage of skilled workers has required increased efficiency in the operations of lifting, moving and setting up heavy equipment. For this purpose, a Power-Assist Lifting device (PAL) is considered one of the most effective means for utilizing the unique sensory skills of a human being and the physical power of a machine. In this paper, the control problem is studied in relation to a PAL which is driven by a parallel wire mechanism. The objective of this study is to develop a control technique using sequential identification of Jacobian matrix so that the wire-driven PAL can move heavy equipment such as large pipes continuously and with precision, without any influence of geometric non-linearity. The effectiveness of the control technique is verified through experiment.