JRM Vol.32 No.5 pp. 1027-1033
doi: 10.20965/jrm.2020.p1027


Physical Table Identification for Nominal Hydraulic Cylinders and its Application to Pressure Estimation

Satoru Sakai*, Kazuki Nagai**, and Yasuki Takahashi*

*Shinshu University
4-17-1 Wakasato, Nagano City, Nagano 380-8553, Japan

**Kubota Corporation
64 Ishizukita, Sakai-ku, Osaka 590-0823, Japan

April 27, 2020
July 28, 2020
October 20, 2020
hydraulic systems, identification, modeling

The paper provides the first completed version of our identification approach as an intersection of two existing approaches: the physical model approach and the data table approach, for a set of valve flow blocks in nominal hydraulic cylinder dynamics. As one of the well-known physical models, the standard Bernoulli equation needs more accuracy in some cases owing to the steady flow assumption, whereas many data tables often need an expensive flow measurement. The proposed identification approach gives a new matrix representation that resembles the table representation but does not need any flow measurement as well as the steady flow assumption. In particular, unlike the conventional valve flow blocks, the updated valve flow blocks have no empty components via the projection guaranteeing the optimization. The effectiveness is confirmed experimentally by an application to the pressure estimation. The proposed identification approach will be applicable to other blocks including nonlinear friction blocks.

Proposed pressure to estimates the measured pressure against nonlinear dynamics

Proposed pressure to estimates the measured pressure against nonlinear dynamics

Cite this article as:
S. Sakai, K. Nagai, and Y. Takahashi, “Physical Table Identification for Nominal Hydraulic Cylinders and its Application to Pressure Estimation,” J. Robot. Mechatron., Vol.32 No.5, pp. 1027-1033, 2020.
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Last updated on Feb. 19, 2024