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The deep-sea ROV system is usually equipped with a heave compensation system under harsh sea states, and a semi-active heave compensation system that consists of a passive and an active subsystem is presented, the compensation mechanism of which is derived theoretically and illustrated in detail. A novel scale model for the underwater umbilical cable system is brought forward according to the Froude...
Hydraulic transformer can improve the transmission efficiency of the hydraulic system. As the manual hydraulic transformer cannot achieve automatic control and remote control in the hydraulic system, to meet this challenge, the electro-hydraulic servo plate-inclined plunger hydraulic transformer (EHHT) was proposed in this paper. First, through analyzing the principle of the EHHT, the structure of...
Hydraulic transformer is a new hydraulic component. In order to decrease the hydraulic transformer's volume, uncover its working principle, and provide theoretical guidance for its practical application, here theoretical analysis and simulation research are carried out. On the basis of the analysis of the displacement of plate-inclined piston type hydraulic motor, the concept, distributor ports' displacements,...
Iris feature extraction is very important for an iris recognition system. This paper focuses on iris feature extraction. In this paper we propose direct linear discriminant analysis (DLDA) which combines with wavelet transform to extract iris feature. In our method, firstly, we apply wavelet decomposition to the normalized iris image whose size is 64times256 and just choose the coefficients of the...
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